尾轮

The design of the device using NC Lathe CA6140 control, part of the main transmission system using AC spindle motor and graded by the pulley driven spindle gearbox, through the inverter and gearbox to achieve sub; Feed System used by stepper motor driven ball screw slowdown after campaign vertical feed system through a gear after the ball screw drive, in the horizontal feed system through two gear-driven ball screw; Tool to automatically transfer tool carrier (4-position), thus achieving automatic tool change; by MCS-51 series 8051 data to be dealt with. from the I / O interface stepper pulse output signal to control the feed rate and itineraries; In order to maintain the function of cutting thread, to the outer end of spindle or other appropriate location loaded pulse generator; Lathe will be transformed into Tailstock manually controlled electric Tailstock.

本设计利用数控装置对CA6140普通车床进行控制，主传动系统部分采用交流调频主轴电动机经带轮及分级齿轮变速箱驱动主轴，通过变频器和齿轮变速箱实现分段无级变速；进给系统采用步进电机通过减速后驱动滚珠丝杠运动，在纵向进给系统中通过一级齿轮减速后驱动滚珠丝杠，在横向进给系统中通过二级齿轮减速驱动滚珠丝杠；刀架改为自动转位刀架从而实现自动换刀；通过MCS-51系列8051单片机对数据进行计算处理，由I/O接口输出步进脉冲信号控制进给速度和行程；为了保持切削螺纹的功能，要在主轴外端或其它适当部位装上脉冲发生器；将车床的手动尾座改造成为可控电动尾座。

The design of the device using NC Lathe CA6240 control, part of the main transmission system using AC spindle motor and graded by the pulley driven spindle gearbox, through the inverter and gearbox to achieve sub; Feed System used by stepper motor driven ball screw slowdown after campaign vertical feed system through a gear after the ball screw drive, in the horizontal feed system through two gear-driven ball screw; Tool to automatically transfer tool carrier (4-position), thus achieving automatic tool change; by MCS-51 series 8051 data to be dealt with.

本设计利用数控装置对CA6240普通车床进行控制，主传动系统部分采用交流调频主轴电动机经带轮及分级齿轮变速箱驱动主轴，通过变频器和齿轮变速箱实现分段无级变速；进给系统采用步进电机通过减速后驱动滚珠丝杠运动，在纵向进给系统中通过一级齿轮减速后驱动滚珠丝杠，在横向进给系统中通过二级齿轮减速驱动滚珠丝杠；刀架改为自动转位刀架从而实现自动换刀；通过MCS-51系列8051单片机对数据进行计算处理，由I/O接口输出步进脉冲信号控制进给速度和行程；为了保持切削螺纹的功能，要在主轴外端或其它适当部位装上脉冲发生器；将车床的手动尾座改造成为可控电动尾座。

The company is committed to nozzle, ruby products, tungsten carbide products, ceramic products, plastic crochet hook and precision machinery manufacturing, and technology and equipment by virtue of their own superiority, self-development, technological innovation, so that technology is getting more sophisticated, continuously improve product quality, The main products are coil winding machine: nozzle(motor nozzle, ruby nozzle, tungsten carbide nozzle), ceramic roller, jump wire preventer, ceramic pigtail , tension gun, various sizes of ceramic eyes, combination wire roller, ceramic wheel and non-standard parts, all kinds of tension, and wire barrel, plastic crochet hook, and so on.

公司致力于线嘴、宝石制品、硬质合金制品、陶瓷制品及精密机械加工制造，同时凭借自身技术和装备优势，自主开发、技术创新，使工艺技术日臻完善，产品质量不断提高，主要产品有卷线机用线嘴、过线轮、防跳线器、猪尾圈、羊毛毡、绕线模、张力枪、各种规格陶瓷眼、组合导线轮、陶瓷轮及非标陶瓷件、各种张力器、压克力绕线桶等各类制。

The results showed that during the 45 days experimental time the fresh weigh of Myriophyllum spicatum L, Hydrilla verticillata L and Cerato-phyllum demersum L were 0.92 g, 0.27 g, 1.11 g and 0.56 g, 0.41 g, 0.87 g in medium nutritional condition TN 1.86 mgL^(-1; TP0.087 mgL^(-1) and eutrophic condition TN 2.47 mgL^(-1; TP0.16 mgL^(-1), respectively. The largest single plant biomass of Myrio-phyllum spicatum L and Ceratophyllum demersum L in in middle nutritional condition were over 39% and 22% higher than those in eutrophicated condition, but that of Hydrilla verticillata L was less than 51%, which shown that Myriophyllum spicatum L and Ceratophyllum demersum L grow better than Hydrilla verticillata L in middle nutritional condition.

研究结果表明，在45 d的培养过程中，狐尾藻、轮叶黑藻和金鱼藻在中营养TN1.86 mgL^(-1； TP0.087 mgL^(-1)和富营养TN2.47 mgL^(-1； TP0.16 mgL^(-1)水平下的单株最大生物量分别是0.92、0.27、1.11、0.56、0.41和0.87 g，狐尾藻和金鱼藻在中营养水平下单株最大生物量分别较富营养水平下高出39%和22%，而黑藻在中营养水平下单株最大生物量较富营养水平下低了51%，表明狐尾藻和金鱼藻在中营养水平下的生长较黑藻好。

But for Myriophyllum spicatum, the optimal concentration of phosphorus was 0.4 mg·L-1. At 0.2 mg·L-1phosphorus, the height and root-length of Hydrilla Verticillata was greater than that of Myriophyllum spicatum, while at 0.4 mg·L-1 phosphorus the reverse was true.

两种沉水植物株高和根长增加量在磷质量浓度小于0.2 mg·L-1时，表现为轮叶黑藻大于穗花狐尾藻；当磷质量浓度大于0.4 mg·L-1时，表现为穗花狐尾藻大于轮叶黑藻。

The numerical results show that:(1) the throughflow wake is considerably influenced by the tip clearance. The low-kinetic-energy fluid accumulated in the shroud/pressure side of the unshrouded impeller, but in the shroud/suction region for 0.0 tip clearance;(2) there possibly exists an optimum size of the tip-clearance which is not the zero tip clearance to make the flow loss minimized.

研究结果表明，(1)NASA低速大尺度离心压缩机半开式叶轮的低速尾迹区在压力面与轮盖的角区，而相应的闭式叶轮的低速尾迹区聚集在轮盖的中心位置；(2)数值实验表明，叶顶间隙并非越小越好，可能存在一个最优间隙，使得叶轮流动损失最小。

Because of its structure and its economic, its tailstock hasn't the automatic feed function, when accessory needs to be bored, according to conventional modus operandi, it needs to fix aiguilles to bore by running tailstock's hand wheel as common NC machine.

由于其结构及其经济性，尾座没有自动进给功能，零件需钻孔时，按常规的做法，仍然是和在普通车床上一样——在尾座上安装钻头，通过转动尾座手轮进行钻孔。

This is a hollow steel cylinder, usually about 2 to 3 inches in diameter, that can be moved several inches longitudinally in and out of the upper casting by means of a hand wheel and screw.

通过手轮和螺杆，尾座套筒可以在尾座体中纵向移入和移出几英寸。

The tail wheel is mounted at the end of an aluminum spring.

尾轮是安装在年底铝的春天。

There were at least two cases of soldiers being taken aloft hanging on to the undercarriage or tail wheel in desperation.

至少有两机仓士兵被带上了天空，他们有的拼命抓住飞机的起落架，有的抱住尾轮。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。