新型传动带——橡胶同步齿型带结构特点及制造工艺和设备

同步带作为一种新型传动带 ,具有带体轻而薄、传动比准确、传动效率高、传动功率大、低噪音等特点 ,其应用范围越来越广泛。主要介绍了橡胶同步齿型带的结构特点、种类、用途以及制造工艺和青岛宜利达工业公司生产的同步齿型带专用生产设备。     

浅谈造纸废水的治理方法

本文综述了国内外造纸工业废水的治理方法和最新动态,重点介绍了中小型碱法草浆造纸厂废水治理和综合利用的方法     

浅谈测温过程检测仪表的信号干扰及抑制措施

生产实践中，过程参数的准确测定和适时调整对系统正常运行关系重大；但过程检测仪表常常易受到外部电磁场的干扰，从而影响测试结果。文章以现代化水泥生产线测温过程检测仪表各种干扰信号的消除为例，详细介绍了这些干扰信号的消除方法和具体措施。其中，对于横向干扰，可采用屏蔽接地和加滤波器消除干扰；而对于纵向干扰，可选择平衡法和隔离法消除干扰。     

四辊压延机复合、卷取工序改进介绍

桦林佳通轮胎公司四辊压延机是1998年购进的意大利倍耐力公司二手薄胶片复合联动线,主要生产半钢子午胎内衬层。由于工艺变动,需在内衬层上复合防擦布,因此需要在四辊压延机复合部位进行大的改进。 图 1原四辊 1 帘布导开架;2—储布架;3 压延主 — — 原工艺步骤是第 一层帘布导开后在 主机下运输带与内衬层复合,在胶条复合架上进行子口护 图 2原压延机复合工序示意图1—主机上运输带;2 —压延机辊筒;3—主机下运输带;4—胶条复合架。 一、原四辊压延机工作原理及存在 …     

VAST4成型机结构与维护简介

介绍了VAST4成型机的主要结构及其性能特点、技术参数和维护保养所需注意事项，日检、周检及月检的要求等。     

恶劣环境中高速风机叶轮的防腐蚀工艺初探

在金属叶轮表面复合一种防腐蚀结构,使得被输送介质气体与金属结构之间被有效隔离,使高速风机叶轮在恶劣环境中使用寿命有效延长。     

Research on rotary nozzle structure and flow field of the spinneret for centrifugal spinning

High-speed centrifugal spinning is a novel method of fabricating nanofibers by use of centrifugal force field. The neoteric designs and proper structural parameters of spinning nozzle will change the outlet velocity and velocity distribution uniformity of spinning solution, which could affect the quality of nanofibers. Four different spinning nozzles that can be used for high-speed centrifugal spinning are proposed. The flow of spinning solution in the different rotary nozzles is simulated based on the theoretical analysis. It can be found that the curved-tube nozzle is better for high-speed centrifugal spinning comparing with the velocity distribution of spinning solution in the four different spinning nozzles. The influence degree of the structure parameters of the curved-tube nozzle on the solution outlet-velocity is explored by orthogonal test method. The result shows that the curved-tube nozzle with an inlet diameter of 10 mm, conical transition pipe length of 3 mm, nozzle outlet diameter of 0.8 mm, curvature radius of 4 mm, and central angle of curved tube of 30°, can effectively enhance the outlet velocity of spinning solution. Finally, it is proved by centrifugal spinning experiment that the curved-tube nozzle after optimization can improve the morphology and quality of nanofibers.     

Effect of the inner wall cooling rate on the structure and properties of a polyethylene pipe extruded at a high rotation speed

A novel rotation extrusion processing system was self‐designed to prepare high‐performance polyethylene (PE) pipes. In this study, during the extrusion of the PE pipes at a high mandrel rotation speed, compressed air, as a cooling medium, was introduced through their interior to achieve the quick cooling of the inner wall and the effects of the inner wall cooling rate on the microstructure and mechanical properties of the obtained PE pipes were investigated. The experimental results showed that in contrast to conventional extrusion, the molecular orientation deviated from the axial direction under a high mandrel rotation speed and was fixed by the inner wall cooling; with increasing cooling rate, the orientation degree also increased. On the other hand, cooling promoted the augmentation of spherulites. So when the cooling rate reached a certain high point, the effect of cooling on the formation of spherulites was stronger than that on the fixation of the orientation. A much higher cooling rate decreased the orientation degree, which was closely related to the performance of the PE pipe. As a result, there was an optimal cooling rate of the inner wall during the rotation extrusion for better performance of the PE pipe. When the cooling rate was 1.5°C/s, the hoop strength of the PE pipe produced by the novel extrusion method increased from the original 24.1 MPa up to 37.1 MPa without a decrease in the axial strength, and the pipe's crack initiation time increased from 27 to 70 h. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

Influence of power ultrasound on the corrosion of aluminium and high speed steel

The influence of power ultrasound on the corrosion of aluminium and high speed steel in chloride medium has been investigated. Open circuit potential, polarization curves and electrochemical impedance spectroscopy were employed to study the corrosion process before, during and after ultrasonic irradiation as well as scanning electron microscopy of the corroded surfaces. Cavitation led to formation of pits, erosion and increased mass transport. The effect of ultrasound power, chloride concentration, horn tip–metal distance and of tip diameter were assessed. The principal effect of ultrasound on aluminium is destruction of the oxide film and on high speed steel removal of corrosion products and increased solution mass transport; the influence of ultrasound is greatest at low chloride concentrations. For both metals it was shown that for chloride ion concentrations up to 0.1 M the influence of ultrasound power is most evident, followed by the distance between probe tip and metal, then [Cl^–] and lastly the size of the probe tip. The potentialities of using ultrasound as a rapid diagnostic test of corrosion resistance are indicated.     

注塑包装设备功能化专用化高速化节能化科学发展的分析研究

注塑包装设备的品种朝着功能化专用化方向发展,成型能力朝着高速化方向发展,控制系统朝着智能化方向发展,加工性能朝着节能化环保化方向发展。高速成型是注塑包装设备的首位加工性能,也是决定是否具有市场发展前途的标志。根据塑料包装容器的应用领域和功能特点,运用现代先进技术开发塑料包装设备,满足内需,推动塑料包装行业的发展。高速成型的研发重点是塑化注射机构、复合平行回路。节能技术的研发重点是伺服动力驱动节能系统、塑化加热节能系统、节能执行机构。能量的回收利用成为节能技术研发的又一个重要课题。创新实例说明注塑包装设备实现高速节能成型的关键是创新高速运行机构和高速成型回路。举例说明我国注塑包装设备科学发展已取得的初步成就。     

常温高效除油清洗剂的制备与应用研究

研制出了一种去油污能力强，可室温使用，综合效果较好的新型高效常温除油清洗剂