Rotational molding forming device

Abstract

The invention discloses a rotational molding forming device applying constant-temperature jet-propelled heating, belonging to the technical field of rotational molding. The rotational molding forming device is used for manufacturing large and medium plastic products with complicated shapes by using a rotational molding technology. The rotational molding forming device mainly comprises an air heating system, a forming die, a gas recycling cover, an insulating layer, a hot air distributing pipe, a nozzle, a rotational spindle cylinder, a crank arm, a hot air inlet pipe and a hot air distributing pipe air outlet pipe. Polymers capable of being applied to rotational molding forming can be processed into plastic products by using the device. According to the invention, the deficiency in several kinds of rotational molding more widely applied to the rotational molding forming device is solved to a certain degree. The novel rotational molding forming device has the advantages of high temperature control precision, good temperature uniformity, high heat exchange efficiency and low die cost, and overcomes the defects of large energy loss, long production period, low production efficiency and the like of the rotational molding forming device.

Description

technical field [0001] The invention relates to a rotary molding device using constant temperature jet heating, which belongs to the technical field of rotary molding. Background technique [0002] Rotational molding is a process for forming hollow plastic products, also known as rotational molding or rotational molding. The rotational molding process is to add plastic powder into the mold, then heat the mold and make it rotate continuously along two mutually perpendicular axes, and the resin in the mold is gradually and evenly coated and melted and adhered to the inner surface of the mold under the action of gravity and heat , forming the desired shape, and then cooling to obtain the product. Compared with extrusion, injection molding and blow molding, which are commonly used in plastic molding, rotational molding technology has the advantages of less investment in equipment and molds, suitable for the production of large and medium-sized and thin-walled plastic products, ...

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Problems solved by technology

[0004] The present invention proposes a rotary molding device, which uses a constant temperature jet heating method to pre-overcome the shortcomings of several widely used rotary molding devices currently used in rotary molding equipment: direct fire heating is mainly used for In swinging rotary molding equipment, the temperature control accuracy and temperature uniformity are poor; the hot chamber air heating type is mainly used in biaxial rotary molding equipment, and there is an extra volume in the hot chamber that is not occupied by the mold, resulting in heat Loss, there will be energy loss in the outer wall of the heating chamber and during each opening and closing of the heating chamber door, and the difference in hot air flow on the surface of the mold in the hot chamber causes low heat transfer efficiency; the jacket heating type has high heating efficiency but the cost of the mold Very high, practical application is limited

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