3results about How to "Short distance" patented technology

This invention belongs to the field of mining engineering technology, specifically disclosing a method for subsequent backfilling of a goaf in a gently dipping thick ore body. The backfilling method involves dividing the ore body vertically into multiple intermediate sections, each intermediate section into multiple segments along the strike, each segment into multiple ore block units along the dip, and each ore block unit into multiple stopes. Segmental vein roadways are arranged along the strike of the floor, and ore extraction ramps are arranged along the dip from these segmental vein roadways. Roof-cutting vein roadways are arranged along the strike of the roof, and roof-cutting ramps are arranged along the dip from these roof-cutting vein roadways. An ore extraction access road is constructed along the strike from the ore extraction ramps, and a drilling roadway is constructed along the strike from the roof-cutting ramps. Downward drilling is used in the drilling roadways to create blast holes and blast the ore, which is then extracted through the ore extraction access road. After mining is completed, a goaf is formed. Backfilling pipelines are laid through the roof-cutting vein roadways, roof-cutting ramps, and drilling roadways to the goaf before backfilling. This invention features reduced mineralization, high efficiency in mining, low cost, and high safety in stope mining.

This invention discloses a flushing valve and its control method. The flushing valve includes a valve body, a piston mechanism, and a control device. The valve body has a water storage chamber, a water inlet channel, a water outlet, and a piston chamber. The water inlet channel, water outlet, and piston chamber are all connected to the water storage chamber. The water inlet channel is used to connect to an external water supply source. The piston mechanism is located in the piston chamber and includes a flushing piston and a water control piston. One end of the flushing piston faces the water outlet. The control end of the control device is located in the piston chamber. The control method includes: adjusting the position of the water control piston in the movable chamber through the control device to adjust the water flow direction inside the piston chamber and control the flushing piston to close or open the water outlet. This invention can effectively shorten the path of the water flow from the water outlet. When flushing from the water outlet, the flushing water flow is independent of the piston chamber controlled by the control device, which can effectively increase the water flow rate and water pressure, resulting in a good flushing effect.

A low-resistance powder concentrator rotor structure, a rotor upper cover plate, a rotor middle plate and a rotor lower cover plate are arranged from top to bottom on the outside of a rotor shaft sleeve and a rotor cone, the rotor upper cover plate and the rotor middle plate are connected with the rotor shaft sleeve or the rotor cone through a rotor connecting plate, and the rotor lower cover plate is directly connected with the rotor cone; a plurality of inclined grooves are formed on the rotor upper cover plate and the rotor middle plate; the rotor connecting plates are arranged in pairs, have the same shape and are symmetrical about the rotor axis; the shapes of the adjacent two rotor connecting plates are different, the included angles with the horizontal plane are different, and the rotor connecting plates are arranged in the form of vertical plates, so that the high-speed airflow in the rotor cage is hindered and scattered. The present application interferes with the generation of the resistance surface of the connecting part position by the special connecting plate and vertical rod arrangement, so that the number of the connecting parts in the same plane or cone surface is small, the ventilation cross-sectional area is increased, and the power consumption of the vertical mill system fan is reduced.