Bidirectional pressure inlet hydraulic device

Abstract

The invention relates to a bidirectional pressure inlet hydraulic device, which at least comprises an oil tank, a hydraulic pump, an electromagnetic relief valve, a power accumulator, and a hydraulic cylinder. The hydraulic pump and the electromagnetic relief valve are connected with the oil tank through a hydraulic oil passage; the power accumulator is communicated with the electromagnetic relief valve through the hydraulic oil passage; the hydraulic cylinder is respectively communicated with the oil tank and the hydraulic pump through the oil passage and is provided with an upper hydraulic cylinder and a lower hydraulic cylinder; and a three-position four-way electromagnetic valve, a two-position two-way electromagnetic valve and two two-position three-way electromagnetic valve are connected to the oil passage where the upper and lower hydraulic cylinders are connected with the oil tank and the hydraulic pump. By controlling the working states of the electromagnetic valves, the switch of the hydraulic passage is realized; and a position feedback signal is provided by a displacement transducer simultaneously, and simultaneous bidirectional pressure inlet is realized by controlling the motion of the upper and lower hydraulic cylinders. The bidirectional pressure inlet hydraulic device can realize one-way accurate positioning and perform pressure inlet on samples bi-directionally at the same speed; the pressure inlet process is under full-automatic control; samples with uniform rock-soil density and moisture content can be acquired; and the rock-soil sampling efficiency andaccuracy are greatly improved.

Description

technical field [0001] The invention belongs to a hydraulic pressure feeding device, in particular to a hydraulic control device used in the field of rock and soil testing, which can carry out two-way feeding pressure on rock and soil samples. Background technique [0002] To test the physical and mechanical indicators of rock and soil, it is necessary to obtain rock and soil samples in the laboratory. The test requires that the rock and soil samples obtained must have the characteristics of uniform density and water content, and a smooth surface. The methods commonly used in the industry are the layered compaction method and the one-way static pressure method. Since the soil sample cannot be uniformly stressed, the resulting sample density and water content are not uniform; electric or manual operations cannot guarantee Accuracy: Since the sample cannot be demolded automatically, after the sample preparation is completed, the human disturbance is large, which interferes gre...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the defects that the traditional rock and soil sample preparation device cannot make the soil sample uniformly stressed, the sample density and water content are uneven, the sample cannot be automatically demoulded, the test results are poor in comparability and repeatability, and provide A hydraulic device for feeding pressure, which can accurately position in one direction and pressurize the sample in two directions at the same speed. The feeding process is fully automatic control, so as to obtain samples with uniform density and water content, and greatly improve the sample preparation of rock and soil samples. efficiency and precision

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