6results about How to "Short distance" patented technology

The utility model relates to a kind of safety management auxiliary devices of chemical equipment, including sealing part, gas storage tank, piston, connecting pipe and standpipe, the sealing part is fixed in flange connection position, a sealing cavity that accommodates flange connection position is formed in the sealing part, inlet and outlet are formed on the gas storage tank, the inlet is communicated with the sealing cavity, the piston is slidably fitted in the inner chamber of the gas storage tank and located between inlet and outlet in the way of sliding along front and back direction, one end of the connecting pipe is fixedly connected with the outlet, the lower end of the standpipe is fixedly connected with the other end of the connecting pipe, the standpipe is made of transparent material. Since the above technical scheme is adopted, under the assistance of the safety management auxiliary device of chemical equipment in the utility model, the workload of the inspector can be reduced.

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.

The application discloses a kind of compact structure's automation laser-engraving equipment and laser-engraving method, the laser-engraving equipment includes machine table, and the machine table is formed with feeding station, jacking station, loading turnover station, loading station, positioning station, unloading station, unloading turnover station and back-falling station;It also includes the loading device being arranged at jacking station and loading station, the positioning device being arranged on the positioning station, the laser-engraving device being arranged on the machine table, the transfer device being arranged on the machine table, the unloading device being arranged at back-falling station and unloading station, and the material conveying device being arranged on the machine table, and the feeding station, jacking station and back-falling station are arranged on the material conveying device.The automation laser-engraving equipment provided in the application is reasonably arranged between each station, accelerates the circulation of material by lifting, overturning and omnidirectional transfer device, shortens material circulation time and distance, and thus improves the efficiency of material laser-engraving.

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.

The present application relates to the field of vortex beam modulation, and particularly discloses a chiral metasurface vortex focusing lens in a terahertz wave band and a terahertz light modulation device, comprising a substrate and a vortex focusing phase wave surface arranged on the substrate; the vortex focusing phase wave surface comprises array-arranged polarizing units, each of the polarizing units comprising a first strip-shaped column, a second strip-shaped column and a connecting column; the first strip-shaped column and the second strip-shaped column are parallel to each other, the connecting point of the connecting column and the first strip-shaped column is closer to the first direction end of the first strip-shaped column, and the connecting point of the connecting column and the second strip-shaped column is closer to the second direction end of the second strip-shaped column; the present application occupies a small space, is easy to integrate, has a low production material cost, shortens the path of terahertz waves in the chiral metasurface vortex focusing lens, reduces the loss in the modulation process, and can obtain a large circular dichroism through normal incidence or oblique incidence of circularly polarized light.