Dynamics of Water Jet in Water Jet Looms

On the base of the study on dynamics of water jet in water jet looms, the parameters of water jet mechanism which affect the speed of water jet are analyzed and optimized. So the stability of the water jet can be improved to raise the speed of water jet as well as weft insertion rate and to enlarge the width of woven fabrics a lot. At the same time it also points out that to increase water jet speed and to prolong its affective jet time depend mainly on the accretion of spring rate (constant)of stiffness and the diminution of plunger's cross sectional area respectively.

Testing and Analysis of the Speed of Water Jet in Water Jet Looms

In the water jet looms, the distribution of the speed of water jet at the axis of the shed and its regularity are obtained by the Laser Doppler Tester. Based on the above, the water jet system is analyzed and the main effective approaches to increase the filling insertion rate and to widen the reed space of the loom are pointed out.

Treatment of Textile Industrial Wastewater from Water Jet Loom Machine

The objective of this research was to investigate the optimum condition for treatment of textile industrial wastewater from water jet loom machine by chemical coagulation and electrocoagulation methods. The variables of chemical coagulation method were type and amount of chemicals, pH and stirring rate. For electrocoagulation method, the variables were electrode materials, electric potential and contact time. It was found that the optimum condition of chemical coagulation method was 10% （w/w） of aqueous solution of aluminum sulphate 80 mL and 0.01% （w/w） of aqueous solution of coagulant aids, cationic polymer 32 mL per 4 L of wastewater at oH 8. The mixture solution was rapidly stirred with 120 rpm for 1 min and then slowly stirred with 20 rpm for 20 rain. The removal efficiency of turbidity, COD and oil content were 88.88%, 85.20% and 77.72%, respectively. For electrocoagulation method, the optimum condition was using aluminum electrode with 35 V and 150 min of contact time. The removal efficiency of turbidity, COD and oil content were 98.86%, 91.63% and 89.84%, respectively. It can be concluded from this study that the textile industrial wastewater treatment from water jet loom machine with electrocoagulation method is more efficient than that with chemical coagulation method.

The kinematic Design of Beating-up Mechanism for Water-jet Loom Series Modified from Air-jet Loom

For Toyoda looms with air-jet weft insertion,the beat-ing-up mechanisms together with those of Tsudakomawater-jet looms are analyzed.Then by changing thecrank length of the four-bar-linkage for the air-jetlooms to get four specifications of reed travel correspond-ing to the series of Tsudakoma water-jet looms,it canbe proved by comparisons of displacements,velocities,accelerations and transmission pressure angles that thosetwo series of mechanisms have very similar kinematicproperties.So the possibility of developing a series of wa-ter-jet looms modified from Toyoda air-jet looms isproved.It is beneficial to save the machine cost andbroaden the machine types.

DYNAMIC PROBLEMS OF WATER JET FOR WEFT INSERTION

In recent years, China has imported thousands of water jet looms. In order to master thetechniques and to develop the variety of products, the dynamic problems of this jet device hasbeen discussed in this paper briefly. It contains 1. Introducing the rotary plunger pumps and the open-type jet nozzles. 2. Establishing the fundamental equations of the dynamic analysis for water jet device. 3. An illustrating example to show the jet speed, and the rate and time duration for the jetflow varies with different pipe resistance, cross section area of the nozzle outlet, and the springcompressive deflection etc. It is useful for research and production references.

从ITMA ASIA+CITME 2022看织造机械的技术进步

总结2022中国国际纺织机械展览会暨ITMA亚洲展览会上织造机械及织造准备的最新技术进展。织造机械的结构与性能不断优化,发展更加贴近市场需求。国产剑杆、喷气、喷水织机的制造水平发展迅速,提高了国产设备的核心竞争力。随着人工智能的爆发式增长,织造机械的数字化转型步伐加快,先进的信息技术和自动化工具的运用使织造机械呈现出个性化、智能化、绿色化发展新趋势。认为:近几年织造机械在高速化、自动化、绿色化方面进步显著。

喷水引纬机构动态特性对自由射流的影响

为适应不同喷水引纬织机幅宽的需求,基于伯努利与液体连续性原理建立喷水引纬机构动力学模型,喷嘴自由射流初始段最大距离与纬纱所受射流牵引力的数值模型,分析其动态特性并通过弹簧刚度系数确定凸轮系统最低转速,探讨不同弹簧刚度系数与弹簧最大压缩量条件下机构动态特性对柱塞运动周期、射流最大速度、雷诺数、射流初始段最大距离、纬纱所受射流牵引力的影响;仿真结果表明:弹簧刚度系数增大时,柱塞运动周期变小,对应的凸轮系统最低转速变大,当弹簧最大压缩量取0.029 m,弹簧刚度系数取40 000、50 000、60 000 N/m时,水射流速度最大值为62.19、69.85、78.99 m/s,射流初始段最大距离为937、1 000、1 074 mm,纬纱所受水射流牵引力为5.37、6.44、7.28 N;而弹簧最大压缩量对上述变量的影响幅度很小,故在大幅宽织机需求下应首要考虑使用更大刚度系数的弹簧。

喷水织机上喷水速度的测试分析

通过应用激光多普勒测速法对喷水织机上喷水速度的测试 ,得出了喷水速度在梭口轴心线上的分布及其变化规律。在此基础上对喷水系统结构进行了分析 ,指出进一步提高喷水速度、增长有效喷水引纬时间和应用接力喷水引纬是提高喷水织机入纬率及扩大织幅的有效途径。同时指出了影响试验数据准确性的主要因素。

喷水织机用微乳液经纱浆料的研制

用 35 %～ 45 %丙烯酸甲酯 (MA)、30 %～ 40 %甲基丙烯酸甲酯 (MMA) (和 /或丙烯腈 )、5 %～ 15 %丙烯酸丁酯 (BA)、8%～ 12 %的丙烯酸 (AA)和甲基丙烯酸 (MAA) ,加入 0 .4%～ 0 .8%的引发剂 ,调节 pH值为 6,通过乳液聚合方法制得了用于喷水织机的新型微乳液经纱浆料。研究了聚合配方和工艺条件 ,如反应单体质量比、引发剂及乳化剂含量对浆料性能 ,如转化率、稳定性、粘度及胶膜水溶性的影响。该浆料可用于涤纶。

喷水织机用多纬同时分别检测装置

喷水织机多纬同时引入时的织造 ,只有在纬丝全部同时检测时才能保证产品的质量 ,提高生产效率 ;但目前大部分织机上没有此检测装置。文章在对喷水织机原有纬丝检测装置的结构进行全面分析之后 ,结合其他无梭织机的纬丝检测装置的结构特点 ,设计了一种利用纺丝机上的感丝器进行检测的装置 ,经试用 ,安全可靠 ,造价低廉 ,不失为一种有意义的探索 ,可供其他无梭织机借鉴。

喷水织机水泵柱塞的模糊优化设计

以日本津田驹ZW-100喷水织机为例,在介绍喷水织机的工作原理的基础上,对喷水织机的水泵柱塞进行了普通优化设计和模糊优化设计．通过对优化结果的对比分析,得出了采用模糊优化设计优于普通优化设计的结论．

喷水织机涤纶短纤经纱用浆料配方的选择

通过分析喷水织机用经纱对浆料的要求及涤纶短纤纱在喷水织机上织造时的上浆要求,确定了涤纶短纤纱上浆所用浆料及多种浆料配方方案。同时,以经纱强力、耐磨性和毛羽指数等指标作为评价上浆效果的依据,对5种浆料配方进行了综合评价,确定较适合的浆料配方为:PVA205MB 49%、聚丙烯酸甲酯49%、氧化淀粉2%。

喷水织机喷水动力学分析研究

通过对喷水织机喷水动力学的研究,分析出影响喷射水流速度大小的喷水机构参数并进行优化,以进一步提高射流的稳定性,提高喷水引纬的速度和适当扩大织幅。同时指出主要通过增大弹簧刚度（常数）和减小柱塞面积来提高喷水速度及增长有效喷水时间。

喷水织机上喷水参数对水射流速度的影响

采用激光多普勒法及正交试验法 ,测试了不同条件下喷水织机的喷射水流速度在梭口轴线上的分布 ,指出喷嘴是影响速度分布的主要因素 ,同时也决定喷射水流的发散程度 ,喷水压力和水流量则分别影响喷射水流的速度峰值大小及峰值点离开喷嘴口的距离 。

合纤织物的纰裂

喷水织机织制合纤织物时,常会造成织物"纰裂"。简要介绍了纰裂的产生原因,并从经纬密度、织物的组织结构、纤维截面、织造的工艺参数和后处理等方面提出了防止措施。

应用于喷水织机的水压数字阀设计及特性的研究

数字阀是数字控制系统中的重要元件。结合喷水织机水压系统的工作特性,设计了直控式数字阀,详述了该阀的结构和工作特点,在此基础上,对调节喷水流量的数字阀的动态特性、流量特性进行了仿真研究分析,其结果可为喷水织机实现数字化控制提供参考。

ZW403型喷水织机送经机构的调整及其对产品质量的影响

从送经机构对织物质量的影响入手 ,对ZW 40 3型喷水织机送经机构进行了全面分析 ,详细介绍了送经机构的调整方法 ,对提高织物的质量有一定的参考价值。

近期国内外织造技术的进步与发展趋势(上)

文章就近年国内外织造技术的进步与发展趋势,综合国内织造行业的现状、产品结构调整与技术进步方向,就我国织造技术的技术发展,提出探讨和看法。

喷水织物缩纬的分析与防治

喷水织机织制合纤加捻织物时经常产生缩纬。文章介绍了一般性纬缩疵点和纬丝头端缠绕形成的缩纬疵点的产生原因和防治措施。

近期国产无梭织机的技术进步与展望——第十六届上海国际纺织工业展览会有感

总结2013年第16届上海国际纺织工业展览会上展出的国产无梭织机的技术进步,并提出了发展建议。介绍了展会上展出的国产剑杆织机、喷气织机、喷水织机的织机型号及特点、所生产的产品规格。分析了三种无梭织机的发展现状及产品开发趋势。结合我国织造行业的现状、产品结构调整与技术进步方向,提出国产剑杆织机和喷气织机的发展方向是加快研发减轻劳动强度的机构、调研市场容量有序生产、加强自主知识产权保护意识。