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Screw extrusion melt pressure stabilizing device and method

The technology of a voltage stabilizer and a molten material is applied in the field of adjusting the fluctuation of extrusion pressure and the voltage stabilizer on the screw extruder, which can solve the problems of pressure fluctuation, large interference of continuous flow of materials, and inability to meet precision extrusion processing. To achieve the effect of reliable sealing and simple structure

Inactive Publication Date: 2003-08-13
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the pressure regulating device has the function of regulating pressure, it is connected in series before the extrusion orifice like the aforementioned gear pump, and all the materials must pass through the device, and the piston moves along the direction of material extrusion, which greatly interferes with the continuous flow of materials, especially When the piston needs to move to the limit position, it will re-build pressure on the ejected (or extruded) material, which will easily cause pressure fluctuations and cannot meet the needs of precision extrusion processing.

Method used

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  • Screw extrusion melt pressure stabilizing device and method
  • Screw extrusion melt pressure stabilizing device and method
  • Screw extrusion melt pressure stabilizing device and method

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Such as figure 1 As shown, the voltage stabilizing member in this embodiment is a voltage stabilizing device with a screw structure. It consists of a connecting body 1, a small screw 2, a driving device 3 and a pressure sensor 4. There is a material channel 5 in the middle of the connecting body 1, and a pressure stabilizing hole 6 is opened on the side wall of the channel 5, and the screw 2 is set in the stabilizing hole 6. , the small screw 2 is driven by the driving device 3 (for example: a common motor and a reducer) to rotate in the pressure stabilizing hole, and the overflow hole 7 is located at the sidewall of the stabilizing hole at the thread end of the small screw 2 . The pressure sensor 4 (ordinary pressure sensor) communicates with the material channel of the connecting body, and the pressure sensor controls the driving device 3 to control the rotating speed of the small screw 2 through a general control method. The pressure regulation method of the pressur...

Embodiment 2

[0019] Such as figure 2Shown: The pressure stabilizing device in this example is a pressure stabilizing device with a piston structure, and the voltage stabilizing device is composed of a connecting body, a piston assembly, a driving device and a pressure sensor. There is a material channel 5 in the middle of the connecting body 1, and a pressure stabilizing hole 6 is opened on the side wall of the channel 5. The piston pressurizing rod 8 is set in the stabilizing hole 6, and a piston 3-B is connected to its end, and the piston is installed in the connection. In the piston cylinder outside the body, it is driven by power to advance or retreat, and the piston pressure rod is driven to move axially in the pressure stabilizing hole 6. The driving device can be as follows: figure 2 The shown cylinder 3-A drives the piston 3-B of the cylinder to push the reciprocating motion of the piston pressurizing rod 8 through the pumping station. The cylinder 3-A can also be a hydraulic cy...

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Abstract

A pressure stabilizer for the molten material extruded out by screw extruder is characterized by that a connecting body with pressure stabilizing hole on its side wall is arranged between the cylinder and head piece of extruder, and a pressure stabilizing part driven by its driver moves in said pressure stabilizing hole to apply or release the pressure to or from the extruded material which flows through the central channel of said connecting body. Its method includes sensing the pressure value of the extruded material, comparing it with its setting, and controlling the movement of said pressure stabilizing part.

Description

(1) Technical field [0001] The invention relates to a melting extrusion processing machine, in particular to a pressure stabilizing device on a screw extruder and a method for adjusting fluctuation of extrusion pressure. (2) Background technology [0002] In the processing of polymers, the screw of the screw extruder not only plays the role of melting, mixing and conveying materials, but also plays the role of building pressure. However, in the process of extrusion, due to the nature of materials, feeding Influenced by many factors such as fluctuations, the proportion of recycled materials, changes in operating process conditions, etc., the pressure fluctuations when the melt flows out of the extruder head are relatively large, resulting in a decrease in the uniformity of the extruded material and affecting the quality of processing. When extruding polymer products, the dimensional error caused by pressure fluctuations can reach about 4%, which is one of the main reasons for...

Claims

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Application Information

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IPC IPC(8): B29C48/92
CPCB29C47/92B29C48/92B29C2948/92409B29C2948/92019B29C2948/92514B29C2948/92904B29B7/726B29B7/428B29B7/58
Inventor 吴大鸣丁玉梅陈卫红刘颖许红
Owner BEIJING UNIV OF CHEM TECH
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