Chamber internal stress test method of screw oil press

Abstract

The invention discloses a chamber internal stress test method of a screw oil press. The method includes the following steps that 1, a pressing bar on a pressing cage of the screw oil press is selected, and N manholes are drilled in the pressing bar; 2, N upper resistance strain gages and N lower resistance strain gages are attached to the outer wall of an pressing bar and a lower pressing bar adjacent to the pressing bar with the manholes in an up-down mode respectively; 3, pressure sensors are arranged in the manholes respectively; 4, the screw oil press is started to operate, and the strain values of the upper resistance strain gages, the strain values of the lower resistance strain gages and the pressure values of the pressure sensors are recorded and obtained; 5, through a bending calibration experiment, the chamber internal stress values corresponding to the stain values of the upper resistance strain gages and the stain values of the lower resistance strain gages are obtained; 6, averaging is conducted on the stress values of the pressure sensors and the corresponding chamber internal stress values obtained in step 5, and the stress values in the axial distribution direction in a chamber are obtained. The chamber internal stress test method of the screw oil press is safe, reliable, convenient and fast to test and real and accurate in test data and has important actual application value.

Description

technical field [0001] The invention relates to the technical field of pressure test methods, in particular to a bore stress test method of a screw oil press. Background technique [0002] Plant materials are currently an important source of edible oil supply, so how to efficiently produce vegetable oil is particularly important. Pressing plant materials with a screw oil press is currently a major way to produce vegetable oil. When the screw oil press is working, the material is pushed forward through the screw in the press cage. Since the pitch of the screw is gradually reduced and the diameter of the screw is gradually increased, the material is squeezed and crushed while being pushed forward, and the oil will be released. squeezed out of the material. The stress size and distribution in the bore of the screw oil press are related to many factors, such as the frictional force, axial force, radial force and tangential force acting on the material when it is squeezed and pu...

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Problems solved by technology

[0003] In the prior art, Fan Benjun of Jiangnan University once proposed an electrical measurement method to calculate the bore pressure of a single-screw oil press. This method is relatively simple and overcomes limited influencing factors, making it impossible to accurately judge the authenticity of data collection; Henan University of Technology Ruan Jinglan used finite element analysis software to analyze and study the relationship between the screw parameters of the twin-screw oil press and the pressure in the press cage, but did not solve how to effectively test the stress in the chamber; Lin Guoxiang and Zheng Xiao of Wuhan University of Light Industry also proposed a calculation The method and test plan of the radial pressure in the bore, but how to accurately test the pressure distribution of the plant material in the bore of the oil press was not proposed at that time

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