Hello, welcome to this website!

中文版 | English| Contact us

Counseling hotline13102889793

热门关键词: Extrusion granulation machine

首页大图
Contact us
Counseling hotline:13102889793

Shijiazhuang Xi Rong Machinery Co., Ltd.

地址:Shijiazhuang City West Development Zone of Wuji County

传真:0311-86504778

手机:13102889793

联系人:Manager Wang

邮箱:wlh88888888@163.com

Tell you about the advantages of the three screw extruder. Don't be surprised!

作者:sjzxrxs 发表时间:2016-03-14   09:47:23

How to use the shorter time to get the maximum benefit is a topic constantly explored by productive enterprises. Driven by the demand of the times, machinery manufacturers have been climbing the peak for innovation and energy conservation. It can be said that the development of industry has gone through the continuous progress and accumulation from 0 to 1, from 1 to n.   

Screw extruders from the beginning of the plunger type, single screw type to the current occupying half of the parallel twin screw type, vertebra type twin screw type, this course has gone for nearly a hundred years, these one hundred years, the development of polymer processing industry has experienced unprecedented prosperity. The three screw extruder, with its flexible geometric arrangement, forms the material in the flow direction, the flow velocity, and the distribution of the particle in the space position.

Due to the poor thermal conductivity of plastic, the large diameter extruder (more than 130) may have a large number of "static" materials in each groove in the process of processing, which causes inhomogeneous plasticization. This problem can not be solved by increasing the screw speed, because it will cause fluctuations and cause the flow marks to become thicker. Although it can be solved by increasing the ratio of screw length to diameter, this method has limitations and has increased many negative effects caused by screw cantilever. The combination of small diameter and short length diameter ratio is one of the effective ways to solve this contradiction. The single screw has no meshing area, the twin screw has a meshing area, the three screw has two meshing areas, the three screw of the triangular arrangement has three kneading areas, the meshing area of the three screw extruder increases, the area of the roller compacts multiplied, and the operation makes the material squeezing, crushing, kneading, stretching and stretching in the operation. . It is precisely this kind of high kneading effect, which makes the three screw without the large diameter and long diameter ratio of single screw or twin screw. The production conditions of equal quality and output can be obtained, which fully embodies the high efficiency of the three screw extruder with high efficiency, compactness and economy. In order to increase output and improve product quality, single screw and twin screw must increase the diameter of screw, increase the ratio of length to diameter, and increase the driving power multiplied. If the twin screw extruder screw of 45 diameter is increased to 70, the productivity of the latter is 3 times that of the former, but the driving power needs to increase more than the output of the unit area. If the screw of 45 screw diameter is changed to a three screw with a diameter of 45, the output of the latter will double, two times that of the former, and the driving force is less than 1.5 times the former. 

How to arrange the three screw?

As the application field of screw extruder has been widened, it has promoted the development and innovation of extruder. The three screw "one" three screw extruder and three screw triangles arranged three screw extruders are new models developed in recent decades.

Whether the single screw or twin screw supporting screw is all loaded with one end of the screw bearing. The cantilever structure makes the vertical weight of the front segment of the screw and the bearing of the other end cause a great asymmetry load, especially in the continuous running friction of the screw. It will inevitably affect the strength of the bearing structure, the length of the time is long, the screw will droop, which affects the smooth of the movement.

The two different screw extruders of three screw extruders are equal to three equal lengths, the main diameter of the main screw is large, the diameter of the two auxiliary screws is small, and the main and auxiliary screws are meshed with each other and rotate in reverse. This design enlarges the rolling area, strengthens the rolling pressure, and has a better effect, not only increases the output, but also increases the energy consumption. Because of the existence of the two meshing areas, the length of the screw can be shortened and the screw suspension can be reduced.

The negative effects of the arm.

The three screw extruder with the screw center connection as inverted character is an innovation in the field of extrusion. Compared with the previous two "one" type three screw extruders, the full meshing three screw triangle arrangement constitutes the unique three meshing areas, which have an extremely complex effect on the flow of material, velocity and the distribution of space position. The multi screw combination with small diameter and small length diameter ratio can achieve high yield and high mixing quality.

The setting of the three screw in the triangular arrangement can be divided into 5 forms of the full meshing three screw extruder, which is based on the twin screw theory. A screw can not meet the two forming principle of the tooth shape at the same time, because the principle of the curve generation of the screw elements of the two screws with the same direction and the opposite rotation is completely different. Therefore, the three screw of the full meshing triangular arrangement is necessarily the same direction rotation, and the number of threaded heads must be odd, or for a singular, or three, not a double head (any phase of the double screw three screw will have interference). Obviously, the three screws with triangular arrangement can not be conjugate meshed geometrically, that is, the spiral and groove can not be meshed with equal width. The three screws are arranged in a regular triangle. It is easy to guarantee the machining accuracy of three screws from the geometric relationship.

The central area is a special area with a triangular arrangement of three screws. The central area is a region that the three screws are swept away at any phase, and is a region from large to small and from small to large. The area in the maximum state of the central region is 7 times the minimum state, and the area in the minimum state is only the cylinder. The 1/200 of the net area (removal of the sectional area of the screw). As the area of the central region is constantly changing, the changing area will not have a stationary fluid. Under the stickiness of the material, these fluids will be brought into the propulsion zone of the flow channel, which, to some extent, promotes mixing.

Although the three screw extruder came out soon, it has been well applied in the preparation of functional plastics, the preparation of high brightness coatings and the processing of convenience food, and has been paid attention to with its excellent mixing characteristics, better productivity ratio and smaller length diameter ratio. The industrial application of the three screw extruder, especially the full meshing three screw extruder with three screws arranged in a triangle, has special characteristics in many aspects, such as bearing setting, manufacturing technology and so on. It is still to be mature technically, and its operating mechanism needs to be studied deeply.



 

立即采购

  • 联系人:请填写您的真实姓名
  • 联系电话:请填写您的联系电话
  • 电子邮箱:请填写您的邮箱地址
  • 意向描述:
  • 验证码:验证码,看不清楚?请点击刷新验证码