An extruder for the production of chairs

Abstract

The invention relates to a plastic extruding machine for producing a chair, and belongs to the field of extrusion manufacturing equipment of common accessories of revolving chairs. The plastic extruding machine for producing the chair comprises a pre-extruding machine and a sub-extruding machine which is connected with the pre-extruding machine in parallel, wherein an isthmus faucium section is arranged between the pre-extruding machine and the sub-extruding machine. The plastic extruding machine adopts a parallel structure of the pre-extruding machine and the sub-extruding machine; and the pre-extruding machine is connected with the sub-extruding machine through the isthmus faucium section, so that a plastic raw material is extruded in a two-stage manner through the isthmus faucium section after being pre-extruded in a heated molten state, and then is extruded from an extrusion head, thus the material is relatively evenly extruded; when the material passes through the isthmus faucium section, the flow rate of the material significantly becomes slow from fast and then becomes fast; excessive bubbles mixed into the material are driven away by the material; and the residual required bubbles can be relatively evenly dispersed into the molten material, therefore, the problem that revolving chair accessories prepared by the plastic extruding machine are low in compressive strength or easy to crack due to the bubbles is avoided.

Description

technical field [0001] The invention relates to an extruder used for producing chairs, which belongs to the field of extrusion manufacturing equipment for common accessories of swivel chairs. Background technique [0002] At present, the competition in the swivel chair industry is becoming more and more fierce, and the practice of many enterprises is to purchase some parts of swivel chairs from outside, which undoubtedly increases the cost of the enterprise. Moreover, the quality of the purchased swivel chair accessories cannot be guaranteed. Extrusion parts are very common parts for swivel chairs. The existing extruders always have problems of one kind or another, such as uneven force on the screw extrusion, excessive air bubbles mixed in the screw extrusion, resulting in poor quality of the produced parts. Reduced compressive strength or easy to crack. For example, the Chinese invention patent with the application number of 201410170134.8 discloses an extruder. It mentio...

AI Technical Summary

Problems solved by technology

However, the structure of existing extruders with pressure balance function is relatively complicated, and disassembly and assembly are very difficult, which brings certain difficulties to maintenance.

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