The main design points of the barrel screw for high-speed extrusion pipe extruders include the following aspects
长径比：通常选择较大的长径比，一般在 30 到 36 之间。较长的长径比可以提供更充分的塑化和混合时间，使材料在高速挤出过程中均匀塑化，从而保证管材的质量。 螺杆槽深度：螺杆槽深度需要根据管道输出量和物料特性进行设计。一般来说，对于高速挤出机，螺杆槽深度相对较浅，以提高物料输送能力并减少物料在螺杆槽内的停留时间。较浅的螺杆槽可以使物料在螺杆旋转过程中更快地向前推进，从而提高挤出速度。 压缩比：压缩比一般在3到5之间。合适的压缩比有助于压实材料，去除材料中的空气，并提高材料的密度和塑化性能。对于高速挤出，压缩比的设计应考虑到材料能够在短时间内完成压缩和塑化过程。 螺距：较大的螺距设计有利于提高物料的输送速度，减少物料在螺杆上的滑移，从而实现高速挤出。通常采用等螺距变深或变螺距变深螺距设计，并根据物料特性和螺杆不同截面的加工要求进行优化。 螺杆头部结构：螺杆头部通常设计成流线型，例如鱼雷头形状，以减少头部材料的滞留和堆积，避免材料过热或分解。这种结构还可以使材料在挤压过程中分布更均匀，从而提高管材质量。 材料选择：由于螺杆在高速挤压过程中承受着高压和摩擦，因此需要选择高强度、耐磨性和耐腐蚀性强的材料，如38CrMoAlA氮化钢，以确保螺杆的使用寿命和稳定性。 冷却和润滑：为防止螺杆高速旋转过程中因摩擦生热导致物料过热，需要设计良好的冷却系统。通常，在螺杆内部设置冷却通道，并通入冷却水进行冷却。同时，合理的润滑措施也有助于减少螺杆与料筒之间的摩擦，提高传动效率。
Repair of the barrel
Repair of the barrel The inner surface hardness of the barrel is higher than that of the screw, and its damage comes later than that of the screw. The scrap of the barrel is the increase of the inner diameter due to time wear. Its repair method is as follows: 1, due to wear to […]
Conical twin screw extruder and wear failure repair methods extruder wear failure after depending on the screw and barrel wear degree and repair symptoms can adopt the following methods
Conical twin screw extruder and wear failure repair methods extruder wear failure after depending on the screw and barrel wear degree and repair symptoms can adopt the following methods: by measuring the screw and barrel of wear in 0.30 Within the mm range, the screw and barrel can be chrome-plated and then finely ground and […]
Conical twin-screw installation
Conical twin-screw installation Conical double screw to install bite together of the conical twin-screw see below. The installation of conical twin-screws and parallel twin-screws is not quite the same. Since the conical twin-screw has a taper, it can only be installed from the back of the screw barrel. First, remove the special tool for the […]
Disassembly and Assembly Process of the Screw
Disassembly and Assembly Process of the Screw (1)Open the machine head and extrude the material in the extruder. After the material is completely extruded, keep the screw idling for at least 5 minutes to prevent residual material inside the screw from affecting screw removal. (2)Remove the pressure sensor from the machine head and open the […]
Repair Methods for Screws and Barrels
1.1 Thermal Spraying Repair Thermal spraying offers surface strengthening for repairs, characterized by high-quality wear-resistant coatings, low cost, high efficiency, and wide applicability. Its basic process involves: melting spraying materials (metals, ceramics, plastics, etc.) into a liquid or molten state, refining them into particles ranging from tens to hundreds of microns, and spraying these particles […]
Main causes and solutions of screw extruder wear
Main cause of wear of the screw extruder The normal wear of the screw and cylinder of the screw extruder mainly occurs in the feeding area and the metering area. The main wear reason is caused by the dry friction between the slice particles and the metal surface, and the wear is reduced. Screw and […]
How to install and adjust the screw extruderInstallation of the barrel
How to install and adjust the screw extruderInstallation of the barrel When the barrel deviation, the screw may be difficult to load, barely loaded The screw will be squeezing noise, or damage the screw shaft And shaft sleeve, or scraping screw and barrel, causing disallowed damage. The way to adjust the deflection position of the […]
The installation method of the conical twin-screw of the plastic extruder
Here is the general installation method for the conical twin screws of a plastic extruder: 1. Preparation Work Clean relevant components of the extruder, including the barrel, screws, coupling, etc., to ensure there is no debris or dirt. Check whether the new screws meet the specifications and whether there is any damage or deformation. Prepare […]
Rosmoul &3D-TECH 18-20 JUNE 2024ICROCUS EXPO, MOSCOW, RUSSIAPAVILION 1,HALL 4F110
Rosmouc&3D-TECH 18-20 JUNE 2024ICROCUS EXPO,MOSCOW,RUSSIAPAVILION 1,HALL 4F110
