Sealing device for extrusion machine screw rod tail
A sealing device and machine screw technology, which is applied in the direction of engine sealing, mechanical equipment, engine components, etc., can solve the problems of wear consumption and leakage, difficult to solve wear and leakage, etc.
Active Publication Date: 2008-08-06
大连橡胶塑料机械有限公司
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Problems solved by technology
[0002] Usually, the tail of the screw of a twin-screw plastic extruder is sealed with a packing or a sealing ring, which consists of a sealing chamber, an inner pressure ring, a sealing ring, and an outer pressure ring. During the rotation of the screw shaft, through the packing Or the elastic deformation of the sealing ring to complete the problem of rotary sealing. Due to the difference in the variety of processing materials, the application is limited. There are always problems of wear and tear and leakage in the application, especially under the conditions of high corrosion and high temperature, it is difficult to solve its wear. and leak issues
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[0012] As shown in Figure 1, the sealing device at the end of the extruder screw, the tail of the screw 7 is equipped with a sealing chamber 1 and a polytetrafluoroethylene aramid sealing ring 4, and the half-ring split external pressure ring 5 is connected to the sealing chamber through a bolt 8, and the bolt The pressure spring 2 is set on the top and is positioned by the fixing nut 3. The sealing ring 4 is installed between the sealing chamber and the screw. There is also a half-ring internal pressure ring 6 between the sealing chamber and the screw. The sealing chamber is filled with nitrogen, and the nitrogen pipeline passes through The inner cavity of the bolt 8 communicates with the sealing chamber, part of the nitrogen returns along the circuit, and part of it is blown back into the feeding barrel to form a nitrogen seal.
[0013] First install the sealing chamber, install the half-ring inner pressure ring, install the PTFE sealing ring, install the half-ring outer pres...
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The invention relates to a twin-screw plastic extruder, which comprises a device for sealing screw tail. The screw tail is sleeved with a sealed room and a sealed ring which are connected by a bolt; the bolt is sleeved with a pressure spring and the sealed room is filled with sealed gas. From another angle, the twin-screw plastic extruder changes mechanism of the traditional device for sealing the screw tail and arranges the pressure spring to keep a compression balance as well as arranges a polytetrafluoroethylene (PTFE) sealed ring to be a friction pair so that good sealing effect and wear resistance are realized. Nitrogen is added in the sealed room and as sealed materials as well as lubricant and coolant of a rotation shaft, the nitrogen blows back leaked materials to an extruder cylinder and seals sealed surfaces easy to leak. The twin-screw plastic extruder completely solves the problems of leakage and corrosion of rotating sealed surfaces and witnesses a great leap of traditional plastic processing technology. Besides, the twin-screw plastic extruder has the advantages of remarkable application effect, leakage and corrosion resistance and prolonging of service life.
Description
1. Technical field [0001] The invention relates to a twin-screw plastic extruder, in particular to a bolt sealing device. 2. Technical background [0002] Usually, the tail of the screw of a twin-screw plastic extruder is sealed with a packing or a sealing ring, which consists of a sealing chamber, an inner pressure ring, a sealing ring, and an outer pressure ring. During the rotation of the screw shaft, through the packing Or the elastic deformation of the sealing ring to complete the problem of rotary sealing. Due to the difference in the variety of processing materials, the application is limited. There are always problems of wear and leakage in the application, especially in high-corrosion and high-temperature working conditions, it is difficult to solve its wear. and leakage issues. 3. Contents of the invention [0003] The purpose of the present invention is to overcome the above disadvantages and provide a sealing device for the tail of the extruder screw, which ca...
Claims
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IPC IPC(8): B29C47/58F16J15/16F16J15/40B29C47/60B29C47/40B29C48/50
Inventor 张炜刘明达鲁敬刘鑫传
Owner 大连橡胶塑料机械有限公司