CN2312454Y

CN2312454Y - Centralizing type and column shaped indirect rock sample traction testing device

Info

Publication number: CN2312454Y
Application number: CN 97241317
Authority: CN
Inventors: 周百海
Original assignee: Wuhan Institute of Rock and Soil Mechanics of CAS
Current assignee: Wuhan Institute of Rock and Soil Mechanics of CAS
Priority date: 1997-09-24
Filing date: 1997-09-24
Publication date: 1999-03-31
Anticipated expiration: 2007-09-24

Abstract

The utility model relates to an indirect stretching test device used cylindrical test piece, which is composed of a locating block 1, a lock screw 2, a guide sleeve 3, a displacement sensor 4, a test piece 5, a lower shim plate 6, a shim bar 7, a mounting body 8, a locating screw 9, an upper shim plate 10, etc., wherein grooves which are strictly centered are arranged on the surfaces of the upper shim plate 10 and the lower shim plate 6 and are used for placing the shim bar 7, V-shaped grooves which are strictly symmetrical are arranged on the locating block 1 and used for placing the test piece 5, therefore, the shim bar is positioned at the vertical symmetry axis of the test piece. The locating screw 9 is used for positioning the test specimen which is centered, and the displacement sensor 4 is used for measuring the deformation of the test piece.

Description

To the indirect tensile test apparatus of the cylindrical rock sample of Chinese style

The utility model relates to and a kind of cylindrical rock or mud is coagulated the device that soil sample carries out indirect tension test.

The tensile strength of material is the important parameter in the engineering design, the splitting test method that international rock mechanics committee member club is recommended is exactly a kind of indirect method that generally is used to measure the tensile strength of rock one class material, its ultimate principle is that a right cylinder sample through processing is horizontally placed under the testing machine pressing plate, and sample with on, respectively put a filler strip (see figure 2) between the lower bolster, filler strip must be positioned on the vertical symmetry plane of sample in strictness up and down, exert pressure with certain loading speed by testing machine then, make in the sample tension that produces perpendicular to the power acting surface until sample along power effect facial cleft.Measure the suffered power of sample and with the perpendicular direction of power acting surface on vary in diameter, just can calculate the tensile strength of material and other mechanical performance index.When testing in this way, because sample is cylindrical, be difficult for putting surely, simultaneously, laying by visual inspection of filler strip is difficult to accurately be placed on the vertical axis of symmetry of sample.Sample easily rolls during pressurization, and operation is inconvenient, work efficiency is very low.

The purpose of this utility model provides a kind of sample and filler strip of making and locatees easily, can accurately measure the indirect tensile test apparatus of sample along the vary in diameter of cracking direction simultaneously, makes test operation easy, and efficient improves, and measurement result is accurate.

For achieving the above object, the utility model utilizes the groove that accurately processes on the upper and lower backing plate surface to make filler strip centering to the indirect tensile test apparatus of Chinese style, utilizes the V-shaped groove that accurately processes on the locating piece to make sample centering.Like this, filler strip just can guarantee strict being on the vertical axis of symmetry of sample; Four dog screws are used for the sample location that will place, so that take down locating piece, put upper padding plate.At this moment, test is ready to complete, adjust displacement transducer after, just can carry out indirect tension test.

Most preferred embodiment of the present utility model is seen accompanying drawing:

Fig. 1 lays and sensor adjustment figure the sample of the indirect tensile test apparatus of Chinese style.

Fig. 2 is the working state figure to the indirect tensile test apparatus of Chinese style.

Below in conjunction with accompanying drawing the utility model is described in further detail.

As shown in the figure, the utility model is made up of locating piece 1, lock-screw 2, guide pin bushing 3, displacement transducer 4, sample 5, lower bolster 6, filler strip 7, fixing body 8, dog screw 9, upper padding plate 10 etc.Its characteristics are: the side of upper padding plate 10 and lower bolster 6 and the medial surface of fixing body 8 are clearance fit, are processed with the groove of accurate centering on the surface of backing plate, and filler strip 7 usefulness cementing agents are fixed in the groove, thereby filler strip just is on the plane of symmetry of fixing body.Also be clearance fit between locating piece 1 and the fixing body 8, and the V-shaped groove of locating piece is symmetrical in its geometric center, by means of the V-shaped groove of locating piece, the axle center of cylindrical sample 5 just is on the plane of symmetry of fixing body 8, thereby protects and to have levied upper and lower two filler strips and just in time be positioned on the vertical axis of symmetry of sample; The sample that four dog screws 9 are used for having placed is fixed on original position, so that remove locating piece 1, loads onto upper padding plate 10; Two displacement transducers 4 that symmetry is installed can slide in guide pin bushing 3 and adjust position between gauge head and the sample, and the sensor that lock-screw 2 is used for adjusting is located.With displacement transducer can note easily sample with the perpendicular direction of power acting surface on distortion so that Computer Processing.

During concrete the use, in advance filler strip 7 is bonded in the groove of upper padding plate 10 and lower bolster 6 respectively, successively lower bolster 6, sample 5, locating piece 1 are put into fixing body 8, and sample is contacted with the V-shaped groove both sides of locating piece, sample is fixed on original position with four dog screws 9, remove locating piece, be placed on upper padding plate 10, the position of adjusting displacement transducer 4 also compresses with lock-screw 2, is applied the contact pressure of 10～20kg then by testing machine, unclamp dog screw 9 again, just can test.

Power in the process of the test and displacement record are got off to import computing machine, just can calculate tensile strength and other stretching mechanical parameter of sample material.

The advantage of the new shape of this practicality is: simple, convenient, accurate positioning can improve the worker greatly Make the accuracy of efficient and test, be convenient to Computer Processing.

Claims

1. one kind to the cylindrical rock sample tensile test apparatus of Chinese style, is made up of locating piece (1), lock-screw (2), guide pin bushing (3), displacement transducer (4), sample (5), lower bolster (6), filler strip (7), fixing body (8), dog screw (9), upper padding plate (10); Of the present utility model being characterised in that: be clearance fit between upper padding plate (10), lower bolster (6), locating piece (1) and the fixing body (8), the groove that strict centering is arranged on the surface of upper padding plate (10) and lower bolster (6), be used to lay filler strip (7), the V-shaped groove that strict symmetry is arranged on the locating piece (1), be used to make sample (5) centering, four dog screws (9) are used to make the sample location of centering, the displacement transducer of two symmetric arrangement (4) can slide in guide pin bushing (3), relies on lock-screw (2) location.