Hollow sample making device

A kind of sample preparation device and hollow technology, applied in the field of hollow sample preparation device, can solve the problems of affecting the normal work of others, noise pollution, poor comparability of test results, etc., achieve a good man-machine exchange interface, ensure flatness, intuitive and easy-to-control effects

Inactive Publication Date: 2010-08-25
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of the hollow sample required for the test is very troublesome, which greatly limits the popularization and application of this geotechnical instrument.
[0003]Predecessors have done a lot of research work on the preparation of hollow samples, but the methods and principles are mostly classical compaction tests. The defects of the developed instruments are summarized as follows:( 1) Sample preparation takes a long time, it is difficult to demould, and

Method used

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Comparison scheme
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Example Embodiment

[0025] Example 1: The overall structure of the hollow sample preparation instrument of the present invention is shown in Figure 1, including an indenter mechanism, a transmission mechanism, and a controller. The indenter mechanism is composed of a lower die head 5, an outer die 6 and an upper die head 7. Two servo motors are selected as the transmission mechanism 1. The transmission shafts of the two servo motors are symmetrically connected to the two screw rods 2, and the two screw rods are respectively connected to the two nut pieces 3, and the two nut pieces are respectively fastened to the lower die 5 and The upper die head 7 is equipped with a position sensor 9 on the two nut pieces 3, two servo motors and position sensors are connected to the controller 11 through a cable 10, and the upper and lower servo motors and the outer die 6 are respectively installed on a fixed object.

Example Embodiment

[0026] Example 2: The steps of using the hollow sample preparation instrument of Example 1 of the present invention:

[0027] (1) Turn on the power of the controller 11 and set various parameters;

[0028] (2) The servo motor as the transmission mechanism starts to run, and drives the screw rod 2 and the lower die head 5 to move upwards until the middle step plane of the lower die head coincides with the lower plane of the adventitia cavity, and it stops;

[0029] (3) Load the material to be pressed;

[0030] (4) The upper die head 7 starts to move downwards, and when its lower plane coincides with the upper surface of the outer membrane cavity, the lower die head also starts to move at the same set speed until the gap between the upper die head and the lower die head The distance is shortened to the set value. And automatically cyclically execute the set compaction times and pressure holding time;

[0031] (5) The upper die head retreats to the upper limit position, and the lower die...

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Abstract

The invention relates to a hollow sample making device, comprising a pressure head mechanism, two transmission mechanisms and a controller, wherein the pressure head mechanism is composed of an upper die head, a lower die head and an outer die; the transmission shafts of the two transmission mechanisms are connected with a screw rod in a symmetrical manner; the screw rod is connected with nut pieces which respectively fasten the lower die head and the upper die head by bolts; the nut piece is provided with a position sensor; and the transmission mechanism and the position sensor are connected with the controller via cables. In the invention, a bidirectional compaction structure in which the upper and lower die heads simultaneously apply pressure on the outer die is adopted in the sample making process; and a die adopts an embedded die cavity structure, and the size and model of the die can be changed according to the samples. The sample making device in the invention has scientific design, simple structure, convenient operation and use and high cost performance, and fundamentally solves the difficult problems of scale material feeding and automatic demoulding in the preparation process of making samples, thus realizing mechanical operation and batch production and having the advantages of rapidness, efficiency, low cost, good sample repeatability and strong comparability; and in addition, the sample making device can make samples in the geotechnical detection field, and popularizes preparation for various test samples similar to ground.

Description

Technical field [0001] The invention relates to a hollow sample preparation instrument, which is a geotechnical sample preparation instrument. Background technique [0002] As an ancient building material, the strength of soil is actually the measurement of shear strength. Experimental soil mechanics is one of the four pillars of the development of modern soil mechanics. With the development of science, a large number of indoor methods for measuring the shear strength of soil have emerged. Compared with other test methods, the hollow cylindrical torsional shear instrument has many advantages that other testing instruments do not have: the principal stress in three directions can be independently applied to the sample, and the shear can be applied to the sample by applying torque and controlling torsional displacement through the piston rod. In addition, the principal stress in the three directions can be changed independently, so that the direction of the principal stress ...

Claims

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Application Information

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IPC IPC(8): G01N1/28
Inventor 侯天顺吉金鹏侯天梁
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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