SU807125A2 - Device for compression testing of soil - Google Patents

Description

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The invention relates to the determination of the strength of a material, namely, devices for testing soils for compression.

According to the main author. St. 279139 a device for testing soils for compression is known, comprising a frame, a spring-loaded platform associated with the short arm of the arm of a different arm, the other end of which is connected to a rod interacting with a cam, a clip with a stamp and a device for creating a vertical load Ij.

The disadvantage of this device is its low accuracy, since it is impossible to provide the same natural frequency at different vertical loads (load weights).

The aim of the invention is to improve the accuracy ..

This goal is achieved by the fact that the adaptation to create a vertical load is made in the form of a screw with a stop shoulder, mounted on the shoulder of working weights, placed on a screw nut with a protrusion at one of its ends, a sleeve with an internal thread:

ends and a protrusion interacting with the protrusion of the nut, on the inner surface of its other end, additional weights mounted on the sleeve interacting with the thread of the sleeve of the hollow threaded rod, in the cavity of which a screw is placed, and mounted on the rod movement drive platform.

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The drawing shows a diagram of the device.

The device comprises a bed 1, a platform 2 connected to the bed 1 by a support spring 3 and the guide rollers 4, a ferrule 5 with a die 6. The platform 2 is connected to a short arm 7 of the opposite arm 8, the end 9 of which is connected to a pull 10 interacting with cam

0 11, the rotational drive 12 of which is mounted on the bed 1. The device for creating a vertical load is made in the form of a screw 13 with a stop collar 14 interacting through the ball 15 with a pin 6, working loads 16 mounted on the collar 14 mounted on the screw 13 of the nut 17 with the protrusion 18 at one of its ends, the sleeve 19 with internal thread

0 20 at one of its ends and protrusion

21, interacting with the protrusion 18 of the nut 17, on the inner surface of the other end of the sleeve 19; additional loads 22 mounted on the sleeve 19, cooperating with an internal thread 20 of the sleeve 19 of a hollow threaded rod 23, in the cavity 24 of which a screw 13 is placed and the actuator 25 moves the rod 23 mounted on the platform 2.

The device works as follows.

A sample of the material is placed in the holder 5 and the stamp b. Install the clip: 5 on the platform 2. On the collet 14 of the screw 13, the working weights 16 are placed, pressed by the nut 17, and the remaining additional weights 22 are placed on the sleeve 19. With the drive 25, the rod 23 moves down the stem 23 until the burt 14 is not in contact through the ball 15 is stamped 6, and the protrusion 21 of the bushings 19 is not detached from the protrusion 18 of the nut 17, and the required clearance is not formed between them. At this point, the sample is loaded with static compressive force. Then, the cam rotation actuator 12 is turned on. The cam 11, turning, causes the pulse 10 to shift 10 and the lever 8. The short arm 7 of the lever 8 causes the platform 2 to oscillate on the support spring Behind the guide rollers 4, creating a pulse effect on the die 6 and sample. .

The oscillation frequency of the platform 2 is set by changing the stiffness of the spring 3. The mass of the platform is provided by the presence on platform 2 of all loads 16 and 22, which can

required for testing, and therefore the natural frequency of the platform remains constant.

At the end of the test, the actuator 25 presses the hollow rod 23 together with the weights 22 and the sleeve 19. The protrusion 21 of the sleeve 19 grips the protrusion 18 of the nut 17 and lifts the screw 13 with the weights 16 to disassemble and remove the sleeve 5 with the die 6..

Claims (1)

1. USSR author's certificate No. 279139, cl. G 01 N, 1969 (prototype). 23 Nr y; yyt% 5;