Twin-screw extrusion mechanism of large-injection-volume extrusion-injection integrated injection molding machine

Abstract

The invention discloses a twin-screw extrusion mechanism of a large-injection-volume extrusion-injection integrated injection molding machine. The twin-screw extrusion mechanism comprises a rack, a storage mechanism and an injection oil cylinder, wherein the storage mechanism and the injection oil cylinder are both installed at the top of the rack, and the rack is provided with a twin-screw extrusion device which reduces the occupied space and cost of the whole machine and meanwhile can assist in disassembly and maintenance. According to the twin-screw extrusion mechanism, the twin-screw extrusion device replaces an existing single-screw extrusion structure, so the occupied space can be greatly reduced, the cost of the whole machine can be reduced, and transportation and production can befacilitated; and meanwhile, an internally designed transmission mechanism can assist personnel in disassembling screw rods while meeting the requirement for providing rotating power for the screw rods, so maintenance and inspection are more convenient during long-term use of the screw rods, and the scrapping of the screw rods and a material barrel is avoided.

Description

technical field [0001] The invention relates to the technical field of injection molding machines, in particular to a twin-screw extruding mechanism of a large injection volume extrusion injection molding machine. Background technique [0002] In the existing large-volume extrusion-injection integrated injection molding machine, the structure of the extrusion part is generally: its composition includes a nozzle, a connector, an adapter, a one-way valve, a front support, a barrel, a screw, a storage cylinder, and a rear support. , storage piston, connecting plate, transmission device (composed of motor, reduction box and thrust bearing, etc.), injection piston rod, injection cylinder rear cover, injection piston, injection cylinder and injection cylinder front cover and other components, the injection molding method is generally It is: the transmission device drives the extrusion twin-screw to complete the plasticization and extrudes the material into the storage cylinder thr...

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Problems solved by technology

[0002] In the existing large-volume extrusion-injection integrated injection molding machine, the structure of the extrusion part is generally: its composition includes a nozzle, a connector, an adapter, a one-way valve, a front support, a barrel, a screw, a storage cylinder, and a rear support. , storage piston, connecting plate, transmission device (composed of motor, reduction box and thrust bearing, etc.), injection piston rod, injection cylinder rear cover, injection piston, injection cylinder and injection cylinder front cover and other components, the injection molding method is generally It is: the transmission device drives the extrusion twin-screw to complete the plasticization and extrudes the material into the storage cylinder through the joint body. After reaching the required amount, the one-way valve activates the extrusion screw to stop the action, and the injection cylinder is filled with oil to drive the piston, piston rod and connection. Plate, and then make the storage piston move to realize the injection and complete the product production, but in order to ensure the injection volume, a large-scale driving device must be selected, and the screw barrel and the overall structure will be correspondingly enlarged, which makes the cost of the whole machine remain high, and is not conducive to transportation. Production

[0003] In order to solve the above problems, the current use of double-threaded rods instead of single-screw rods can solve the problems of structural enlargement, etc., but the two screws of the existing counter-rotating twin-screw extruders rotate outwards in different directions. In the process, the separation force of the material reacting to the screw under the barrel is upward, so the screw is constantly running in the top of the inner surface of the barrel during the production process, and the screw and the inner wall of the barrel will wear to a certain extent, and the amount of wear will reach a certain value. The screw and barrel need to be scrapped, and the existing twin-screw is inconvenient to disassemble, making it difficult for personnel to effectively find and solve the wear problem. Therefore, we propose a twin-screw extrusion mechanism for a large injection volume extrusion injection molding machine

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