Device and method for testing rheologic property of coal mine filling slurry

Abstract

The invention discloses a device and a method for testing the rheologic property of coal mine filling slurry. The device comprises an outer cylinder, an inner cylinder, a fixing plate, a torque sensor, bolts and a connecting rod; the inner cylinder is arranged inside the outer cylinder; grooves I are formed in the upper edge of the outer cylinder; the fixing plate and the grooves I in the opening of the outer cylinder are clamped mutually; a groove II is formed in the fixing plate; the opening of the inner cylinder is positioned in the arc-shaped groove II in the fixing plate; the torque sensor is arranged in a fixing clamping groove in the fixing plate, and connected with the fixing clamping groove through the bolts; a variable speed motor is arranged in the torque sensor; the upper end of the connecting rod are connected with a small-scale motor and the torque sensor; the lower end of the connecting rod is positioned in the middle of the inner cylinder; the length of the connecting rod is adjustable; a resistance piece is arranged at the lower end of the connecting rod, and is in contact with the slurry inside the inner cylinder. According to the device, through the resistance piece connected by using different ways, slurry rheologic parameters at different height positions can be measured at different speeds, so that the accurate measurement of the yield stress and the plastic viscosity of the slurry and the homogeneity assessment on the slurry can be realized.

Description

technical field [0001] The invention relates to a rheological performance testing device and testing method of coal mine filling slurry, especially suitable for laboratories to accurately measure the homogeneity, plastic viscosity and yield stress of filling materials through the testing device. Background technique [0002] The determination of the rheological properties of coal mine paste filling slurry is of great significance to the design of slurry conveying pipelines. After obtaining the rheological parameters, the relevant knowledge of non-Newtonian fluid mechanics can be used to determine the type of fluid in the pipeline (such as Bingham fluid, Plastic fluid and pseudoplastic fluid, etc.) and then determine the flow velocity distribution, pressure drop, flow rate, average flow velocity and average strain flow velocity of the fluid in the pipeline according to relevant theories, and establish relevant theories and provide experimental basis for the optimal design of p...

AI Technical Summary

Problems solved by technology

[0004] Existing technology and its shortcomings: there are relatively few special instruments designed for the rheological performance of filling slurry, and the existing concrete rheometers are not accurate enough for plastic viscosity and yield stress testing, and the performance of homogeneity evaluation is low

A concrete rheometer, the publication number of which is CN2569143Y, provides an instrument for measuring the rheological parameters of high-fluidity concrete, and is used for the measurement of the rheological properties of concrete in the laboratory and the construction quality control of the construction site, but The rheological performance test method of this instrument has large errors, and the homogeneity of the material cannot be evaluated; a rheometer, the publication number is CN101101254A, provides a viscosity measuring instrument, which is used for low-viscosity materials For testing, the size is small, and it is not suitable for rheological performance testing of filling materials; the announcement number is CN203720175U, which provides a device for testing the rheological performance of fresh concrete, which can measure multiple sets of data to balance the reaction materials The rheological performance parameters are suitable for testing the rheological performance of freshly mixed concrete in the laboratory, and can also monitor the quality of concrete on the construction site

The test method used is relatively simple, and the accuracy of the test data is limited

[0005] Although the slump test is a field test method widely used in China at present, it is difficult for this method to accurately reflect the rheological properties of the filling slurry. The workability of the coal mine filling slurry is a comprehensive performance, which should include at least three indicators, namely Flowability, Cohesion and Pumpability

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