Bulk solid material friction characteristic test fixture and sample filling method

Abstract

The invention discloses a bulk solid material friction characteristic test fixture and a sample filling method. The problems the traditional fixture is low in material adaptability, inconvenient in material filling and high in test error are solved. The test fixture comprises an outer ring (1), an inner ring (2) and a cover plate (3). The outer ring (1) is composed of a base plate (11), an outer wall (12), a ring core (13), outer ring baffle plates (14) and a circular cavity (15). The inner ring (2) is composed of an inner ring wall (21) and inner ring baffle plates (22). The cover plate (3) is composed of four thin flat plates (31), ribs (32), a span slot (33) on each thin flat plate (31), and a center shaft (34). When the test fixture is employed, the outer ring (1), the inner ring (2) and the cover plate (3) are coaxial. According to the test fixture and the method, a friction characteristic test of various bulk solids such as powder, particles and low viscosity viscoelastic mixtures can be realized, and material filling convenience and test precision are improved.

Description

technical field [0001] The invention relates to the field of testing technology, mainly to the field of friction characteristic testing, in particular to a fixture for testing the friction characteristic of bulk solid materials and a sample filling method. Background technique [0002] Bulk solid material is a common material form in the industry, which specifically includes powder, granular body and high-viscosity mixture. Bulk solid materials have properties common to fluids and solids, and frictional properties are generally used to describe their physical properties. Bulk solid materials appear in material processing, such as feeding, mixing, extrusion, etc., due to their friction characteristics, such as bridging, rat hole, agglomeration, accumulation, collapse, friction overheating, etc. will occur in these process links Phenomenon. In order to study these phenomena and analyze their causes, the research application of bulk solid materials was born. [0003] General...

AI Technical Summary

Problems solved by technology

However, the setting of ribs is not suitable for powders with good fluidity or high-viscosity mixtures with good fluidity, which may cause problems such as material overflow or obvious boundary effects

[0004] At present, there are mainly the following problems in the test fixture for the friction characteristics of bulk solid materials: (1) The adaptability of the material is not strong, and it is not suitable for materials with high fluidity; The corner area of ​​the rib forms a void in the material, and the fluctuation of the void during the test affects the accuracy of the test result; (3) The test error caused by the boundary effect is relatively large, because the rib itself is also a general part of the flat plate, and the material may collide with the surface of the rib. slippage, error

Images