Virgin material in advance of virgin bore within, some virgin materials will have a reverse movement in a small gap pressing screw thread edge and squeeze cages formed on the surface, that material back. Forming material back is caused due to a variety resistance, such as intermittent pressing screw helical teeth; pressing screw thread slit edge and squeeze cages formed on the surface is too large; pressing screw pitch is too large; virgin and virgin material cage surface The friction between the larger; the gap is too small cake mouth caused by the "back pressure" and pressing the theory bore virgin material compression ratio greater than the actual compression ratio and so on. Return is expected to affect the production capacity and oil yield press shall be controlled in accordance with the actual requirements. Pressing screw screw bottom diameter and pitch circle diameter change form stepped screw shaft, otherwise Luohe press spiral form stepless screw shaft. The pressing screw pitch of the screw shaft pusher will change the speed change. Several screw bottom diameter and pitch different from the ring and pressing screw together, set in a pressing shaft to fight the system to become a gradually decreasing pitch, screw bottom diameter of the screw shaft increases. It consists of pressing the shaft and shaft sleeve in pressing section seven pressing bolts and pitch circle of six components. Section pressing screw is threaded stud Luohe press brand, and its role is to accelerate the advance of the preform; pressing the end of the second quarter Luohe tapered screw press equipment, it tapered first paragraph virgin end cage mate, now composed of the first pressing of the system. Section VII from pressing screw to screw the screw pressing base diameter gradually increases, forming a second press systems. The first five laps from the pitch circle of flat, second, third, fourth, six from the pitch circle of the cone ring. Which is good Luohe press _ Goodwin machinery (certified) _ Luohe press provided by Nanyang City, Qi Feng Machinery Co., Ltd. Nanyang City, Qi Feng Machinery Co., Ltd. (www.qifengjixie.com) (www.nyqfjx.com) is Nanyang, Henan, edible oil processing machinery leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Goodwin machinery leadership with the staff warmly welcome all inquiries negotiations to create Goodwin machinery better future.