皮带轮：注塑机螺杆转速不稳定原因及转速的确定

第一：注塑机螺杆的工作转速不稳定，受下列几个因素影响：

First: The working speed of the screw of the injection molding machine is unstable, which is affected by the following factors:

1、传动V形带磨损严重，工作时打滑。

1、The driving V-belt is severely worn and slips during work.

2、V形带传动皮带轮的中心距过小，使带传动不能与皮带轮梯形斜面正确摩擦传动工作。

2、The center distance of the V-belt drive pulley is too small, so that the belt drive cannot correctly friction drive with the trapezoidal slope of the pulley.

3、机筒内加热料温度偏低，原料塑化不均匀，造成注塑机螺杆转动工作负载扭矩增大，使注塑机螺杆转速不稳。

3、The temperature of the heating material in the barrel is low, and the plasticization of the raw materials is not uniform, which causes the increase of the working load torque of the screw of the injection molding machine, and the screw speed of the injection molding machine is unstable.

4、注塑机螺杆用推力轴承损坏等。

4、The thrust bearing of the screw of the injection molding machine is damaged.

第二：注塑机螺杆的工作转速不稳定对塑料制品质量的影响：

Second: The influence of the unstable working speed of the screw of the injection molding machine on the quality of plastic products:

1、 制品的几何形状尺寸误差大；

1、The geometric shape and size error of the product is large;

2、 制品会经常出现横向皱纹；

2、The product will often show horiz

3、 制品表面粗糙、易脆裂或局部有硬块出现。

3、The surface of the product is rough, brittle, or partially hard.

第三：注塑螺杆的转速应根据注塑条件进行选择。

Third: The rotation speed of the injection screw should be selected according to the injection conditions.

1、用注塑机的额定螺杆转速。注塑PS时，以额定塑化量的50%--60%来标定所要加工物料的塑化能力和螺杆转速。

1、Use the rated screw speed of the injection molding machine. When PS is injected, the plasticizing capacity and screw speed of the material to be processed are calibrated with 50%-60% of the rated plasticizing amount.

2、根据聚合物所能允许的最大线速度来确定螺杆转速。

2、Determine the screw speed according to the maximum linear speed allowed by the polymer.

螺杆最高转速 n=V/πD式中 V----聚合物允许的最大线速度。一般聚合物V=80cmm/S,热敏性聚合物V=1.8cm/s D----螺杆直径（cm）

Maximum screw speed n=V/πD where V----maximum linear speed allowed by polymer. General polymer V=80cmm/S, heat sensitive polymer V=1.8cm/s D----screw diameter (cm)

3、根据聚合物所允许的切变速率r来确定，可将上式中的V换成r后再确定。

3、Determine according to the allowable shear rate r of the polymer, which can be determined after replacing V in the above formula with r.

在进行螺杆转速调整时，要从较低转速开始，向较高转速逐渐调试，再行确定螺杆转速。

When adjusting the screw speed, start from a lower speed, adjust to a higher speed gradually, and then determine the screw speed.

以上内容由台州市椒江精艺机械厂整理提供，专业生产制造、销售各种皮带轮、手轮、滑轮、联轴器.等传动机械配件的综合型企业。总占地面积10000余平方米，已有30年的生产历史，生产规模大，技术员工经验丰富。设计人员可根据客户所提供的图纸或常规型号的相关数据设计加工生产40mm至1500mm各种型号规格的产品及各种铸件等。我厂所用的生产原料都是标准合格的合金，产品工艺精良，使用寿命长，运动精密度高，拆装便捷，能有效提高整机质量，很多国内外厂家，商家，已大批量向我厂订购。

The above content is organized and provided by Taizhou Jiaojiang Jingyi Machinery Factory. It is a comprehensive enterprise specializing in the production and sale of various belt pulleys, hand wheels, pulleys, couplings and other transmission machinery accessories. It covers an area of more than 10,000 square meters, has 30 years of production history, large-scale production, and rich experience in technical staff. Designers can design, process and produce various types and specifications of products and castings from 40mm to 1500mm according to the drawings provided by customers or related data of conventional models. The raw materials used in our factory are all standard qualified alloys. The products have excellent craftsmanship, long service life, high movement precision, convenient disassembly and assembly, and can effectively improve the quality of the whole machine. Many domestic and foreign manufacturers and merchants have sent large quantities to our factory. order.