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A fully hydraulic non-servo rock creep test device and method

A creep test, full hydraulic technology, applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problems of complex control technology, inability to calculate the stress of rock samples, and difficulty in meeting the requirements of test accuracy.

Active Publication Date: 2021-04-02
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] 1) On the one hand, the loading cylinder is used to generate the load required for the rock creep test. On the other hand, due to the existence of frictional resistance, the load of the testing machine cannot be directly obtained from the pressure of the loading cylinder, which can only be measured by the load sensor The force value (load) is used as a feedback signal to control the pressure of the hydraulic cylinder (when the load is constant, the pressure of the hydraulic cylinder is variable), so the control technology is complicated;
[0018] 2) The key control element of the hydraulic system, the electro-hydraulic servo (or proportional) valve is a precision hydraulic component, which is expensive, has high requirements for use and maintenance, and is easily damaged;
The requirements for the working temperature of the working fluid are also very high, and the circulation of the hydraulic oil generates a lot of heat, so a larger oil tank and a better cooling device are used to control the oil temperature, which makes the hydraulic system of the testing machine complicated;
[0020] 4) Due to the above reasons, the purchase cost of rock creep testing machine based on electro-hydraulic servo control is high;
[0021] 5) Due to the use of hydraulic oil as the working medium, it pollutes the laboratory environment a lot
Due to the continuous operation of the oil source, the energy consumption is large, so the maintenance cost is high;
[0022] 6) In a non-isothermal environment, high-precision constant load control is difficult
Therefore, the difference between the actual magnification and the theoretical magnification using this type of technology is relatively large;
[0034] 2. Since the frictional resistance is not a constant value, the load cannot be calculated by multiplying the weight (gravity) of the heavy object by the theoretical magnification, and the rock creep testing machine using this type of technology cannot accurately set the experimental conditions in advance (for creep tests, the rock sample stress);
[0035] 3. The creep testing machine combined with multi-stage lever and loading hydraulic cylinder also has friction resistance between the piston and the seal, so it is impossible to directly calculate the rock sample stress according to the pressure of the loading hydraulic cylinder;
[0036] 4. Because there is no control on the load at all, it is greatly affected by the test environment, and the test accuracy is difficult to meet the requirements
[0037] 5. It is difficult to adapt to rock creep tests under high stress and large load conditions (such as loads up to several hundred tons)

Method used

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  • A fully hydraulic non-servo rock creep test device and method
  • A fully hydraulic non-servo rock creep test device and method
  • A fully hydraulic non-servo rock creep test device and method

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Embodiment Construction

[0095] Such as Figure 5 , 6 As shown, a fully hydraulic non-servo rock creep test device includes a disc-sealed single-acting loading cylinder 37 and a non-servo hydraulic pressure stabilization system, and the disc-sealed single-acting loading cylinder 37 includes a loading plunger 22, Housing 23, disc-shaped rubber seal 24, venting plug 21, pressing plate 28 and base 25, the loading plunger 22 is placed in the housing 23, the housing 23 is installed on the base 25, the The disc-shaped rubber seal 24 is provided between the housing 23 and the base 25, the center of the disc-shaped rubber seal 24 is provided with a round hole, and the center of the loading plunger 22 is provided with a through hole. The center of the pressing plate 28 is provided with an air release hole, and the pressing plate 28 presses and installs the disc-shaped rubber seal 24 on the loading plunger 22, and the venting plug 21 is used to plug the passage hole; the base 25 is provided with a liquid inle...

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Abstract

The invention belongs to the field of the rock creep test, and specifically relates to a full-hydraulic non-servo rock creep test device and method. The technical scheme is as follows: the full-hydraulic non-servo rock creep test device comprises a disc type sealing single-action loading hydraulic cylinder and a hydraulic pressure-stabilizing system. Through the full-hydraulic non-servo rock creeptest device and method provided by the invention, a test machine is simple in structure, high in load control precision, the load control precision can satisfy the requirement under the test environment of large temperature difference between day and night, the purchasing cost is low, the use maintenance cost is low, and the environment pollution is avoided.

Description

technical field [0001] The invention belongs to the field of rock creep tests, and in particular relates to a fully hydraulic non-servo rock creep test device and method. Background technique [0002] Rock creep refers to the phenomenon that the deformation of rock continues to increase with the passage of time under the condition of constant rock stress. For rock engineering with a long service life, rock creep characteristics have an important impact on the stability of rock mass engineering structures. Indoor creep test is one of the main means to obtain and evaluate rock creep characteristics. Rock creep testing machine is the basic equipment for indoor rock creep testing. The basic requirement for creep testing machine is to provide constant load. [0003] The test of rock creep properties usually takes 15-20 days for a rock sample. For other mechanical properties of the rock, it only takes 15-30 minutes for each rock sample. Therefore, the test of rock creep propert...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/12
Inventor 徐曾和李少华朱万成
Owner NORTHEASTERN UNIV LIAONING
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