Magnetorheological fluid characteristic tester

Abstract

The invention discloses a magnetorheological fluid characteristic tester, including a rack device, a transmission device, a lifting device, a shearing device and a control measurement device. Torque and rotating speed required by rotation are provided through a main motor, and a dynamic torque sensor is directly connected with the main motor; an upper shearing disc transmits shear yield stress tothe torque sensor through an upper magnetic core; the lifting device mainly comprises a lifting motor and a ball screw, and a lead screw nut at the lower end is connected with an electrical support ina transmission part; and the shearing device consists of a magnetic circuit, a coil, a heating device and a magnetism isolation sealing component. The magnetorheological fluid characteristic tester has the advantages of simple structure, convenient operation, high safety and complete functions, and is relatively wide in measurement range; a trapezoid magnetic circuit structure is adopted, and themagnetic circuit is stable and uniform; a motor lifting control scheme is adopted, thereby realizing automatic control of detection; a multi-input heating mode is adopted, and the temperature is adjustable and controllable; and a sand bath heating mode is adopted, stability and reliability are achieved, and controllable temperature is high.

Description

technical field [0001] The invention relates to a magnetorheological fluid characteristic tester, which belongs to the technical field of magnetorheological fluid research equipment. Background technique [0002] Magnetorheological fluid is a suspension formed by dispersing micron or nanoscale magnetic particles in a specific liquid, and its main components include magnetic particles, carrier liquid and various additives. The main working principle of the magnetorheological fluid is: when there is no magnetic field, the magnetic particles of the magnetorheological fluid undergo random Brownian motion; after the magnetic field is applied, the magnetic particles in the magnetorheological fluid aggregate along the direction of the magnetic field to form chain, the whole is in a semi-solid state showing non-Newtonian fluid characteristics; after the magnetic field is withdrawn, the magnetorheological fluid returns to a suspension liquid state showing Newtonian fluid characterist...

AI Technical Summary

Problems solved by technology

[0003] The commercial yield stress testers currently on the market are mainly foreign products and are expensive. There is no standard method for the yield stress test of magnetorheological fluids in China. The lack of systematization and incomplete testing have hindered the further development of magnetorheological fluids. Research and commercialization of magnetorheological products; currently known magnetorheological fluid characteristic testers are limited by coils, and the radius of rotation is small, so the shear strain rate of magnetorheological fluid is limited and cannot be completed under high shear rates. In addition, there are many transmission parts between the power part and the shearing part, which may easily cause transmission errors and cannot guarantee the reliability of the measurement accuracy; the existing heating method of the magnetorheological fluid measuring instrument has a slow heating process, and the shearing device Magneto-rheological fluid conducts heat unevenly, causing deviations in measurement results

Images