SU1469302A2 - Rock specimen bending test apparatus - Google Patents

Abstract

The invention relates to a test technique and can be used to test for bending of rock samples. The purpose of the invention is to expand the functionality. The installation contains a frame 1, placed on it a fixed yoke 2 with a central support 3 for sample 4 and a movable yoke 5. On the latter there is a drive screw 6 with oppositely directed threads 7 and 8 at its ends and an additional pair of coaxial screws 9 and 10 installed symmetrically with respect to the axis of the support 3 and parallel to the screw 6. On the threads 7 and 8, bushings II and 12c are installed with end supports in Biiue of rollers 13 and 14. On screws 9 and 10, additional bushings 15 and 16 are installed with additional end supports in the form of rollers 17 and 18. Traverse a 5, screws 6, 9 n O are associated with a rotational drive 21. The drive 21 moves the yoke 5 relative to the support 3, and by turning the screws 6.9 and 10, the distance between the rollers 13, 14,17 and 18 changes. In the process of loading, a change in the arm torque of the end supports occurs, which allows installation functionality I il. S (l

Description

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The invention relates to a test apparatus, in particular to installations for testing bending of rock samples.

The purpose of the invention is to increase the range of applied forces by providing a change in the arm torque of the end supports during the loading process.

The drawing shows the scheme of the proposed installation.

The installation includes a support frame 1, fixed on it a fixed yoke 2 with a central support 3 for the test specimen 4 of the rock, a movable yoke 5. and a loading mechanism. The latter is made in the form of a driving screw 6, having on the cond program. At the same time, by rotating the screws 9 and Ш, the sleeves 15 and 16 with rollers 17 and 18 are moved and the gear is poured over the distance. from the respective rollers 13 and 14. In this case, the distance between the rollers 13, 17 and 14, 18 is selected from the conditions for providing the required arm sizes 10 reactive moments of the rollers 13, 14, 17 and 18. To change the bending load, move the yoke 5, change This is the compression ratio of the spring J9. Moving the rollers 13, 14. 15 17 and 18 Carried out in accordance with the loading program, and deformation of the sample 4 along the entire length is recorded. At the same time, in the process of loading, a change of the shoulder of the ax ax, the opposite direction of the threaded moment of the end supports, as indicated by the program, occurs. At the same time, by rotating the screws 9 and Ø, the sleeves 15 and 16 with rollers 17 and 18 and mouth are moved: they are poured over the distance. from the respective rollers 13 and 14. In this case, the distance between the rollers 13, 17 and 14, 18 is selected from the conditions for ensuring the required shoulder arm values of the rollers 13, 14, 17 and 18. To change the bending load, move the yoke 5, changing spring compression ratio J9. Moving the rollers 13, 14. 17 and 18 Carried out in accordance with the loading program, and deformation of the sample 4 along the entire length is recorded. In this case, in the process of loading, a change in the reaction arm occurs.

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s 7 and 8, an extra pair of screws and 10 with analogical counter-directed threads. Screws 6, 9 10 are placed on the movable yoke 5, with. screws 9 and 10 are mounted coaxially with each other, symmetrically with respect to the axis of the central support 3 and parallel to screw 6. Screws 6 and 7 have screws 1 and have bushings 1, 1 and 12 on which end supports are installed in the form of rollers 13 and 14. Screws 9 and 10, additional bushings 15 and 16 are installed, on which the corresponding additional foot supports in the form of rollers 17 are mounted. and 18. The central support 3 interacts with the power spring 19, the clamping of the valve is controlled by the screw 20. The mobile yoke 5 and the screws 6.9 and 10 are kinematically connected to the rotational drive 21.

The installation works as follows.

Sample 4 is placed between the resilient plates 22 and between rollers 13, 14, and 17, 18 is installed between the 45 screws. With the screw 20, the initial load on the sample 4 is set by deforming the spring 19, which transfers the force to the central support 3. By rotating the screw 6, the sleeves And and 12 with rollers 13 and 14, increasing the distance with the last batch in accordance with 35

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This effect influences the strength and deformation characteristics of the test sample 4. Thus, the placement of additional end supports on additional driving screws 9 and 10 parallel to screw 6 provides an increase in the range of forces applied during testing at the installation,

Claims (1)

Invention Formula Test setup for bending rock samples according to ed. St. No. 1323910, characterized in that, p. In order to increase the range of applied forces by ensuring the change in the arm torque of the end supports during the loading process, it is equipped with an additional pair of coaxial drive screws with oppositely directed threads placed on a mobile cross member symmetrically about the axis of the central support and parallel to the drive screw, an additional pair of bushings, mounted on the respective additional screws and the second pair of end supports for the sample, fixed-on the respective additional bushes, and extra screws kinematically St. za- iy .c rotation drive.