How to choose the rapid temperature change test box cooling rate

The rapid temperature change test box is different from the national standard high and low temperature test box, and the national standard high and low temperature test box has no index of the cooling rate. The time from the ambient temperature cooling to the nominal minimum temperature is generally 90 to 120 minutes. High and low temperature alternating test chambers, high and low temperature hot and humid test chambers all have the requirements of variable temperature speed. The temperature change rate is generally required to be 1°C/min, and the speed can be adjusted within the range of this rate.

The rapid temperature change test chamber cooling rate of heating or cooling faster, generally can reach 3 °C / min ~ 15 °C / min, in some temperature zones, temperature, cooling rate can even reach 30 °C / min or more. The temperature range of various specifications and speeds are generally the same, ie, -60 to +130°C, but the range of temperature variation for checking the cooling rate is not the same. According to the different test requirements of the test, the temperature change range of the rapid temperature change test chamber is -55 to +80°C, and some -40 to +80°C.

There are two ways to describe the temperature change rate. One is the average heating and cooling rate in the whole course, and the other is the linear temperature rising and cooling speed (actually, the average speed is every 5 minutes). The overall average speed refers to the ratio of the difference between the maximum temperature and the minimum temperature to the time within the variable temperature range of the test box.

At present, the technical parameters of the temperature change rate provided by foreign environmental test equipment manufacturers all refer to the average rate of the whole process. The linear temperature rise/fall rate refers to the temperature change rate that can be guaranteed for every 5 min period. In fact, for the rapid temperature change test box, the most difficult and most critical step to ensure the linear temperature rise and fall is the cooling rate that the test box can achieve during the last 5 min of the cooling section.

From a certain point of view, the linear temperature rise and lower speed (average speed every 5 minutes) is more scientific. Therefore, the test equipment is best to have the two parameters of the average lift temperature rate and the linear lift temperature rate (average speed every 5 minutes). In general, the rapid temperature change test box linear temperature rise and fall speed (average speed every 5 minutes) is 1/2 of the average speed of the whole process.

Vegetable oil processing equipment includes several sections from oil seeds to the producted oil. Firstly, pretreatment of oil mill plant, ie oil seeds pretreatment before extraction, such as seeds cleaning process, seeds dehulling process, cooking process, flaking process etc. Then the secondly section is oil pressing or oil extraction section. Then the crude oil will be conveyed to the refinery plant to be refine, through the refining process the oil will be filling into bottles, or cans after packing for sale.

All these processing need the proper equipment to deal with, such as capacity of single machine, economical design, how to match each link device. Good product quality is our foundation, to meet customer's different  satisfaction through best and economical way is our purpose. We believe we can do the works you expected based on our several decades experience on manufacture oil and fats equipment. Sincerely hope we can establish a good long term business relationship in the near future. 

Dingzhou Yongsheng Grain And Oil Machine Company is Specialized mill of grain and oil facility in Hebei Province. We have 10 professional and technical personnel, and 5 senior engineer among them.The area of mill is 35,000 square meter, and capital assets is 15 million. We own various modern processing machine more than 200 sets, of which is controlled-heat by computer for the heat-treated carburizing process,and up to the national advanced standard,additionally,and the test methods of physical and chemical inspection for the mechanical properties are complete.

For about 20 years,we designed and developed many specialized machines independently. Such as: YZY400 whole-day spiral oil extraction press, YZY290 whole-day spiral oil extraction press,YZY260 whole-day spiral oil extraction press,YZYB260 oil extraction press,LZY206 whole-day spiral oil extraction press,LZY206-2 double-spiral oil extraction press,LZY126 double-spiral oil extraction press,LZY98 double-spiral oil extraction press, ZY321, ZY281, 204, 202, 200 oil extraction press; YZCLΦ1200-3000*5 floors series of steaming and roasting cooker; 71, 91, 130 disc - type hulling machine; 30,50,65 pressure filter; 50, 80 single, double, triplicity oscillating screen machine ; Triplicity cylinders oil pump kinds of conveying equipment and also all these components for all machines.

And we also undertake adapt of 202 from 200, modification of 204 pre-press expeller, and it is successful for more than 200 sets. We supply specialized spiral in expeller to our customer for high-oil-content plant, mainly as rape seed, peanut, sunflower seed, pepper, rice bran, corn germ, castor-oil plant etc. They are becoming popular with solving the problem of high residual oil rate.

All our components used are made from high quality steel, 30% of life-span more than others common components. They are qualified of abrasion resistant spiral for expeller in all middle and big oil factory. We can take on the whole project from the design, manufacture, installation, commissioning of the complete plant of pre-press oil extracting, leaching, refining. And it is approved in many big oil mills home and abroad, such as Russian Federation, Bulgaria, Argentina, Armenia, Syria, Burma, Vietnam ect.

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