Polyurethane raw material temperature control method for refrigerator

Abstract

The invention discloses a polyurethane raw material temperature control method for a refrigerator, and relates to the technical field of polyurethane foaming. The method comprises the following steps:(1) a rated temperature range T1 of raw materials in a raw material tank and a rated temperature range T2 of raw materials in an injection gun head are set; and a raw material temperature differencevalue in the raw material tank and in the injection gun head is a rated difference value delta T; (2) actual temperatures of the raw materials in the raw material tank and in the injection gun head are detected; (3) a difference value of the actual temperatures of the raw materials in the raw material tank and in the injection gun head is calculated; and (4) the temperature of the raw materials inthe raw material tank is controlled according to a difference value between the actual temperature difference and the rated difference value. The temperature of the raw material tank is controlled through detection of the difference value of the actual temperatures of the raw materials in the raw material tank and in the injection gun head, so that the temperature of the raw materials in the injection gun head can be timely adjusted, and the problem of influence on the foaming quality due to easy exceeding of the set range caused by larger temperature change of the raw materials in a traditional injection gun head is solved.

Description

technical field [0001] The invention belongs to the technical field of polyurethane foaming, in particular to a method for controlling the temperature of polyurethane raw materials used in refrigerators. Background technique [0002] Refrigerators and freezers are indispensable electrical appliances in the family. The very important process in the production of refrigerators and freezers is polyurethane foaming. Both the refrigerator box and the door body need to be foamed after polyurethane foaming, so as to achieve heat preservation and support. Therefore, the foaming quality of refrigerators is extremely important. It is well known that the temperature of polyurethane raw materials has a great influence on the foaming quality. At present, the temperature control of major refrigerator manufacturers in China is the temperature in the white material tank and the black material tank, but there is a long pipeline between the raw material tank and the injection gun head. When t...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for controlling the temperature of polyurethane raw materials used in refrigerators. By detecting the difference between the actual temperature of the raw materials in the raw material tank and the actual temperature of the raw materials in the injection gun head, the temperature of the raw material tank is controlled, so that the injection gun When the temperature of the raw material at the head fluctuates, it can be adjusted in time; it solves the problem that the temperature of the raw material at the head of the existing injection gun changes greatly, and it is easy to exceed the set range and affect the foaming quality.