Large-flow safety valve testing device

Abstract

The invention belongs to the technical field of dynamic performance testing for a large-flow safety valve for a coal mine hydraulic support, and provides a large-flow safety valve testing device in order to test the dynamic performance of the large-flow safety valve conveniently and effectively. The large-flow safety valve testing device comprises a hydraulic cylinder and an explosion cylinder which are fixed on an installation frame, and is characterized in that cylinder bodies of the hydraulic cylinder and the explosion cylinder are relatively static, a piston of the hydraulic cylinder and a piston of the explosion cylinder are connected through the same piston rod, the installation frame is provided with an energy absorbing device along a stroke direction of the piston rod, the maximum distance between the energy absorbing device and the piston rod end at the hydraulic cylinder side is less than the maximum distance between the hydraulic cylinder piston and the bottom part inside the cylinder body of the hydraulic cylinder, a closed cavity in the explosion cylinder is connected to an air inlet system and an exhaust system, an upper cavity and a lower cavity of the hydraulic cylinder are connected to a plurality of fluid paths respectively, and a connection part of the cylinder body of the hydraulic cylinder and the bottom of the hydraulic cylinder is provided with an installation opening of a tested safety valve. The large-flow safety valve testing device is fast to open, high in pressure increasing gradient, and capable of well simulating the whole process of open overflow, rated overflow and close.

Description

technical field [0001] The invention belongs to the technical field of dynamic performance testing of a large-flow safety valve used in a coal mine hydraulic support, and in particular relates to a large-flow safety valve test device. Background technique [0002] The safety valve is an important protection component of the coal mine hydraulic support. It is used to control the actual working resistance of the hydraulic support and keep it from exceeding the allowable value. Currently, the 1000L / min high-flow safety valve has been widely used in high-end hydraulic supports. Dynamic characteristics (dynamic pressure overshoot, opening time, stability, and stabilization time) are important properties of safety valves, and are crucial to the performance and role of hydraulic supports in the coupling of hydraulic supports and surrounding rock. At present, the urgent problem to be solved for the large-flow safety valve is the lack of matching safety valve simulation test system, ...

AI Technical Summary

Problems solved by technology

[0004] However, if the current test system for safety valves is used to test large-flow safety valves, there are still some shortcomings. The flow and pressure requirements provided by high-pressure pumps are too high. Therefore, special equipment is required for large-flow safety valves. The test system and equipment are poor in versatility and technically difficult

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