A detection method and detection device for a fuse bar of a plastic extruder

Abstract

The invention discloses a method and a detection device for a fuse bar of a plastic extruder. In the method, a material bar for detection is placed directly below the discharge port of a plastic extruder, and the material bar for detection is the current plastic extruder The material of the product being produced or a material similar to the melting performance of the product being produced; once a broken strip occurs during the production process, the broken strip falls on the above-mentioned testing material strip, and the residual heat of the broken strip will heat the testing strip to its peak. The glass transition temperature, so that the detection material strip changes from the glass state at normal temperature to the high elastic state until it is broken or fused; when the detection material strip is broken, an external alarm is issued. The detection device includes a material strip for detection, a material strip support, a contact detector and an audible and visual alarm device. One end of the material strip support exerts an upward or downward pretightening force on the detection material strip. The invention has simple structure, convenient configuration, can save labor cost, improve product quality, reduce loss and waste, and has high prospect of popularization and application.

Description

technical field [0001] The invention relates to the research field of plastic extrusion granulation, in particular to a detection method and a detection device for a fuse bar of a plastic extruder. Background technique [0002] At present, in the production process of plastic extrusion granulation, due to the influence of factors such as unstable raw material properties, uneven mixing, and process fluctuations, abnormal conditions such as broken bars often occur. If broken bars appear abnormally during the production process, and If the operator cannot find out the abnormality and deal with it in time, the broken strip will affect the rest of the strips of the machine head, and eventually form a large piece of material, which not only affects the production progress, but also wastes materials, increasing manpower, material resources and Cost of production. [0003] In order to be able to detect sliver breakage at the beginning of sliver breakage and notify the operator to d...

AI Technical Summary

Problems solved by technology

The detection methods of these alarms are different. Some use infrared detection, some use pressure sensors, and some use conductive rod conduction. Although it is feasible in principle, the above methods are not suitable for plastic extrusion granulation This kind of production process with complicated process and bad working conditions has not been widely promoted.

[0004] The current plastic extrusion granulation broken bar detection alarm mainly has the following three shortcomings: (1) Both infrared detection and pressure sensing have poor anti-interference ability, unreliable system, false alarms caused by misoperation or detection failure Case

(2) Infrared detection, pressure sensor and conductive rod are all relatively sophisticated detection devices, the purchase cost is high, and they are easily damaged during machine cleaning, so they are not practical in plastic granulation production

(3) Both the pressure sensor and the conductive rod are contact detection devices. Plastic condensation on the detection device can easily cause damage to the detection device and cannot be recycled, which will eventually lead to an increase in use costs

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