4results about How to "Avoid trial failure" patented technology

The present invention belongs to the technical field of overpressure protection during the water pressure test of the primary circuit of a nuclear power plant, and specifically relates to a method for realizing simple and effective overpressure protection of the primary circuit water pressure test when the entire primary circuit needs a water pressure test after the overhaul of the nuclear power plant. The measurement signals of four pressure gauges are connected to the DCS signal acquisition cabinet, and the designed overpressure protection setting value is written into the DCS software. The DCS software processes and calculates the collected signals according to the overpressure protection setting value. When the measured pressure value exceeds the setting value, the pressure relief valve is opened to release the pressure or the water pressure test pump is shut down to prevent the primary circuit from overpressure; and a preliminary experiment of the water pressure test of the primary circuit is carried out. The present invention can avoid accidental pressure relief of the primary circuit due to malfunction of the protection system during overpressure or boosting of the primary circuit, which ultimately leads to water pressure failure of the entire primary circuit.

The present invention relates to a triaxial sample preparation device and test method for rock-like materials, belonging to the field of geotechnical and hydraulic engineering technology, including a sample preparation frame and a controller, the sample preparation frame is hollow and both front and rear ends are open, the sample preparation frame is provided with an automatic compactor and a mold body used in cooperation with each other and an automatic demolding device for demolding, the automatic compactor is electrically connected to the controller; the automatic compactor includes a reciprocating motor, an output shaft, an adjusting connecting rod and a compacting block connected in sequence from bottom to top, the reciprocating motor is fixed to the top of the sample preparation frame, one end of the output shaft is connected to the reciprocating motor in transmission, and the other end is movably sleeved with the adjusting connecting rod up and down, the compacting block is detachably connected to the free end of the adjusting connecting rod, the adjusting connecting rod is provided with an identification groove along the length direction, and a scale identification is provided in the identification groove. The present invention avoids the deviation caused by manual sample preparation, makes sample preparation more accurate, and is simple to operate and has high work efficiency.

This invention relates to the technical field of materials mechanics testing, and provides a creep-fatigue testing device and method for determining test parameters for thin-walled tube structures. The device includes: a clamping assembly, a rigid inner plug, a split outer clamp, and a positioning pin; the rigid inner plug is connected to an external loading system via a connecting structure; a temperature control assembly, including a heating mechanism and a cooling mechanism; the heating and cooling mechanisms are arranged along the axial direction of the thin-walled tube structure to form a gauge-length heating zone and a clamping cooling zone; and a measurement assembly for acquiring the axial deformation parameters and temperature parameters of the thin-walled tube structure during the test. This invention balances clamping stability and specimen integrity, allowing direct creep-fatigue testing of thin-walled tube structures while fully preserving the inherent shape, size, and stress distribution characteristics of the thin-walled tube structure; it achieves precise zonal control of damage modes, constructing a differentiated damage system on a single thin-walled tube structure, and accurately controlling the damage evolution rate in each region.

The utility model discloses a cell climbing slide gripping device, which comprises a mounting seat, three or four grippers extending downwards are mounted on the mounting seat, the three or four grippers extending downwards are rotationally connected with the mounting seat in a concentric circle manner, each gripper comprises a gripping rod, the bottom end of each gripping rod is connected with a gripping head, and the gripping head is connected with the mounting seat. The grabbing rod and the grabbing head are connected to form a hoe shape, the grabbing head is provided with a cutting edge which is conveniently inserted between the bottom of a cell slide and a culture dish, the upper end of the grabbing rod is connected with a turntable through a connecting rod, and the turntable is rotationally connected with the mounting seat. The cell climbing slide grabbing device is simple in structure and ingenious in arrangement, the cell climbing slide can be easily grabbed in the culture dish, the probability that the cell climbing slide is broken due to misoperation when the cell climbing slide is grabbed is reduced, and therefore test failure caused by breaking of the cell climbing slide is avoided.