Asphalt penetration tester capable of changing needles

Abstract

The invention relates to an asphalt penetration tester capable of changing needles. The asphalt penetration tester comprises a base, a vertical bracket, a transverse bracket, a revolving member, a test section, sample installers and a computer, wherein the vertical bracket extends upwards from the base and is fixed on the base; the transverse bracket is fixedly connected with the upper end of the vertical bracket; the revolving member is arranged on the transverse bracket; the test section is connected to the revolving member; the sample installers are placed on the base; the computer is arranged on the base; a plurality of containing grooves are formed in the base; the sample installers are fixed in the containing grooves through sliding sections which are arranged at the bottoms of the sample installers and support the sample installers; the sliding sections can rotate around a ring shape on the base; the test section comprises an action section, a plurality of clamping sections, a plurality of displacement sensors, and a plurality of needle heads; the plurality of clamping sections are arranged below the action section and are connected with the action section; the plurality of displacement sensors are arranged below the clamping sections and are clamped by the clamping sections; the needle heads are arranged below the displacement sensors and fixedly connected with the displacement sensors; and the revolving member can carry out 360-degree free rotation in the horizontal direction, and can change the sensors and the needle heads through rotation.

Description

technical field [0001] The invention relates to the technical field of performance evaluation test equipment or devices for road asphalt pavement materials, in particular to an asphalt penetration tester with replaceable needles. Background technique [0002] Existing asphalt penetration testing instruments are usually provided with a platform for placing a flat-bottomed glass heat preservation dish, and a device for adjusting its level is arranged on the platform, a bracket for fixing the cantilever is arranged on the side of the platform, and a needle connection The rod brake button can make the needle rod fall or rise freely; the cantilever can rotate freely and adjust the distance, and there is a small mirror or spotlight bulb at the end to observe the contact between the needle and the surface of the sample. The bottom surface of the cantilever is provided with a needle connecting rod perpendicular to the platform; the temperature is measured by a temperature sensor, an...

AI Technical Summary

Problems solved by technology

[0003] However, the existing penetration tester has the following disadvantages: the asphalt sample adopts a water bath for heat preservation, and the uneven heat conduction causes the temperature displayed on the sensor to be the temperature of the water in the heat preservation dish, rather than the actual temperature of the sample , making the experimental data inaccurate

At present, judging whether the needle touches the surface of the asphalt sample is judged by the specular reflection of the spotlight on the water surface. Different operators have different judgment standards. Sometimes the needle is inserted too much or not inserted into the asphalt sample, which makes the experimental results The error is relatively large; in addition, when performing the asphalt penetration test, only one data can be obtained by using one needle at a time. After one test, the needle needs to be cleaned and re-tested, which affects the test efficiency. It is difficult to control the temperature of asphalt patterns

Images