Design of Automatic Pressure Increasing Device of Hydraulic Support

Background, insufficient setting load is a common problem for hydraulic supports in fully mechanized mining face in China, which will reduce the support performance of hydraulic supports and even cause serious accidents. Materials and methods, with the idea of improving safety of coal mining, saving cost and convince, a new kind of automatic pressure increasing device should be designed to increase the setting load to improve the support performance. First, based on the work requirements and characteristics, the control loop which could automatically increase the pressure of prop system was designed by means of functional combination. Secondly, the principle structure of pressure increasing mechanical device which was divided into pressure increasing structure and auxiliary structure was designed with the method of reserving liquid mouth and unit design.Then, some structural details were perfected to allow the units to reasonably contact with each other and constitu te a complete mechanical device.Finally,the application test of the automatic pressure increasing mechanical device was completed in ZY8800/22/45 hydraulic supports by supplying liquid, initially supporting and monitoring dates. Results, the results show that, after the application of the device, the setting load of ZY8800/22/45 hydraulic support is more than 30MPa and the resistance time is two seconds or less. Conclusion, through comparison and analysis of the test results, the pressure increasing mechanical device can increase the setting load and reduce the resistance time remarkably. Main conclusions, the device combines mechanics with hydraulics, gets rid of the restriction of the pump station, completes the work process without manual operation and can be widely used in various types of hydraulic supports and working face since it is designed based on general principle and convent to transport and install.