Cooling and heating devices for injection molds

Abstract

The invention discloses a cooling and heating device for an injection mold, which comprises a compressor (1), a heat exchanger (2), a throttling element (3), four reversing valves and connecting pipelines (4). The mold (5) is provided with a cooling and heating circuit (6), and the cooling and heating circuit (6) is provided with two inlets and outlets. Reversing valve II, reversing valve I and the other two connection ends of reversing valve II are respectively connected to one end of the heat exchanger and the first inlet and outlet, and the other end of the heat exchanger is connected to reversing valve III and reversing valve IV , a throttling element is connected in series between the reversing valve and the reversing valve IV, and the reversing valve III and the reversing valve IV are also connected with the second inlet and outlet. Adopting the present invention can make the mold cool evenly without generating dirt in the cooling channel, and the cooling part and the heating part of the device are integrated, so that the cooling and heating of the mold can be realized in a set of devices.

Description

technical field [0001] The invention relates to the field of injection molds, in particular to a cooling and heating device for injection molds. Background technique [0002] In injection molding, the temperature of the mold directly affects the quality and production efficiency of the product. Due to the different performance and molding process requirements of various plastics, the requirements for mold temperature are also different. Generally, the temperature of the plastic injected into the mold is 200-300°C. After the melt is solidified into a product, it is released from the mold with a lower temperature. The reduction of mold temperature mainly depends on the introduction of cooling medium in the mold to take away the heat. The cooling time of the injection mold mainly depends on the cooling effect of the cooling system. According to statistics, the cooling time of the mold accounts for about 2 / 3 of the entire injection cycle , so shortening the cooling time of the...

AI Technical Summary

Problems solved by technology

The main problems are as follows: (1). The cooling system and the heating system are completely different devices. For example, when the mold needs to be cooled, the cooling system is used, and when the mold needs to be heated, the heating system is used. The two systems operate independently and have not been optimized. ; (2), after the cooling system has been used for a period of time, the solid deposits in the water are easy to scale in the cooling circuit of the mold and reduce the heat transfer efficiency; (3), when cooling the mold, the temperature of the water should be raised, and the mold inlet and outlet There is a certain temperature difference, which is easy to cause uneven temperature control and cause product quality to decline

Images