Hello, guys! What the editor brings to you this time is the relevant knowledge points of the internal injection monomer hydraulic prop. Our interest in the internal injection monomer hydraulic prop is still relatively high. The following explanation is still hoped to let the partners gain something.
1. In daily use, the prop should be carefully checked before going down the well, and the high and low pressure test should be carried out. There should be no pressure drop within 2min, no leakage in the cylinder body within 4h, no jamming in the lifting column, and the limit device should be reliable to ensure safety;
2. In order to ensure the cleanliness of the coal mine pillar, the valve hole of the pillar head shall be tightly blocked with plastic bowls during the transportation of the single hydraulic pillar; The liquid injection port of the three-way valve should be parallel to the coal wall to reduce the collapse of coal dust during blasting, and at the same time, prevent the collapse outside the three-way valve from injuring people;
3. Before injecting liquid into the internal single hydraulic prop, the liquid injection gun should be opened to flush the nozzle of the gun and valve to prevent coal dust from injecting into the valve body;
4. When withdrawing the pillar, use a special handle and hang a solid gangue curtain to prevent the top beam and large gangue from hitting the pillar; Each shift of the working face is equipped with 2 full-time pillar managers, who are responsible for the counting and management of pillars, top beams and horizontal wedges, dealing with general faults, replacing invalid three-way valves and damaged top covers, etc;
5. The pillars, top beams and horizontal wedges of the working face shall be numbered, and "seating according to the number" shall be implemented. In normal operation of coal pillars, the rated resistance is determined by the opening pressure of the safety valve. The higher the opening pressure of the safety valve, the greater the rated working resistance of the support, and the higher the contact pressure of the support to the top and bottom plate; On the contrary, it is small.
6. During the actual use of the internal injection single hydraulic prop, in order to facilitate the management of the prop, the opening pressure of the safety valve is adjusted to 30t, which causes the roof to be cut off when the working face of the broken roof is pressed periodically. Almost no safety valve is opened in this row of props, causing the back top fence to be broken, and the top plate along the inclined direction to suffer wavy bending damage; Local roof fall accidents occur from time to time.
