36results about How to "Reduce scour damage" patented technology

The invention discloses a buoyancy geomembrane device for preventing overburden dam failure. A wave-retaining wall is arranged on the dam crest on the upstream side, and a rectangular groove is fixed on the side wall of the wave-retaining wall facing the water. The length direction is parallel to the height direction of the wave wall, and several water inlet holes are opened on the side wall near the top of the rectangular groove, and a floating ball is arranged in the rectangular groove; the lower end of the floating ball is connected with one end of the corrosion-resistant metal wire, and the rectangular groove One end of the PVC pipe is fixed at the bottom, the other end of the PVC pipe is located in the dam crest, and the other end runs through the dam crest, protruding out of the downstream side wall of the dam crest, and the other end of the corrosion-resistant metal wire passes through the PVC pipe and protrudes The downstream side wall of the dam crest is connected with the support. The invention is installed under the anti-wave wall, and automatically deploys the geomembrane to protect the dam crest and the downstream surface from being scoured when flooding occurs, greatly reducing the scouring damage of the dam body, reducing the possibility of dam failure, and extending the length of the small earth-rock dam service life.

The invention relates to a differential column-splitting inlet energy dissipater, comprising a water current inlet section, a stilling pool connected with the water current inlet section, and an apron connected with the stilling pool; the water current inlet section is composed of a high-level drainage channel (drainage hole) and a lower-level drainage channel (drainage hole) which are arrayed alternatively, a slim is arranged at the boundary position of a drop-sill of the outlet end part of the high-level drainage channel of the water current inlet section and the lower-level drainage channel and a bottom plate of the stilling pool, the slim is a right-angle wedge shape, the bottom surface of the right-angle wedge shape is arranged on the bottom plate of the stilling pool, and the side surface vertical to the bottom surface of the right-angle wedge shape is attached to the drop-sill of the outlet end part of the high-level drainage channel of the water current inlet section and the lower-level drainage channel, a tail sill of the stilling pool is a differential tail sill, and the top surface of the differential tail sill is formed by a combined surface unit I and a combined surface II which have different structures and are arrayed alternatively; a middle isolated pier tail between the high-level drainage channel and the lower-level drainage channel is a cantilever type streamline pier tail. The energy dissipater can improve the service life and reduces scouring damage of water current to downstream river channels.

An in-tunnel weak pressure sudden dropping and sudden expansion type jet flow stilling pool energy dissipation system is composed of a jet flow hole section connected with an upstream tunnel section, a drop sill arranged at an outlet of the jet flow hole section, a low-pressure stilling pool connected with the drop sill, and a tail sill connected with the tail of the low-pressure stilling pool and a downstream tunnel section from the upstream section to the downstream section in sequence. A gate matched with jet flow hole outlets is arranged at the outlet of the jet flow hole section and located above the drop sill. The jet flow hole section is provided with at least one jet flow hole, and the jet flow holes are formed by connecting a contraction type transition section with a pressing slop section in the water flow direction. In the formula d=(1.3-1.5)X, wherein d is the height of the low-pressure stilling pool, and X is the height of an upstream tunnel. Through the in-tunnel weak pressure sudden dropping and sudden expansion type jet flow stilling pool energy dissipation system, the energy dissipation effect can be ensured, cavitation and cavitation erosion as well as bottom plate scouring can be avoided, meanwhile, the engineering excavated volume is decreased, and the safety and economical efficiency of engineering are improved.

The invention discloses a dust removal and atomization nozzle for active magnetized water of a fully-mechanized face, and a dust removal method thereof. The dust removal and atomization nozzle comprises a nozzle cap, an atomization and mixing cavity, a spiral water quantity adjustor, cross gap diaphragms, a mist spray hole, a nozzle base, water outlet holes and a nozzle inner cavity, wherein the lower end of the nozzle base is connected with each nozzle arrangement device through a thread; the nozzle inner cavity is arranged in the nozzle base; the nozzle cap is installed on the nozzle base through a thread; the mist spray hole is arranged in the top end of the nozzle cap; the spiral water quantity adjustor is arranged in the nozzle cup; the spiral water quantity adjustor is in streamline transition connection with the nozzle inner cavity; an adjustment nut is arranged at the top end of the spiral water quantity adjustor; the water outlet holes are arranged in the circumference of the side surface of the spiral water quantity adjustor; and the cross gap diaphragms are arranged at the lower end of the nozzle inner cavity. The dust removal and atomization nozzle is low in water consumption, capable of avoiding magnetic shield, easy to adjust a water quantity, good in dust removal and atomization effects, convenient to maintain, and applicable to dust removal for the active magnetized water of the fully-mechanized face, thus the dust removal efficiency is increased.

The invention discloses an optimal arrangement method of a bridge coup. The method is characterized in that the critical conditions for the optimal arrangement can be obtained by a water tank test which is carried out through a varying-slope circulating glass water tank (1). The method comprises the steps of 1, performing single-columned pier test to verify the reliability of a test system; 2, testing with two pier columns according to different pier spaces; 3, respectively observing the local scouring features of single pier column and the upstream and downstream pier columns in step 1 and 2; 4, analyzing to obtain the critical conditions for the optimal arrangement, namely, the critical conditions that two piers do not influence each other. With the adoption of the method, the critical condition that the upstream and downstream bridge piers do not influence each other in scouring is determined, which is of general guide significance for the optimal arrangement of the bridge group; the method is simple and easy to be carried out; the construction cost and the accumulation influence on the bridge group can be reduced; therefore, the pressure from bridge pier scouring damage and urban flood control can be reduced. The formula is shown in the specification.

The invention provides an adjusting valve labyrinth disc combined structure with a guide sleeve. The structure comprises the guide sleeve, and a plurality of adjusting labyrinth type discs are stacked outside the guide sleeve in a sleeving manner. The adjacent adjusting labyrinth type discs are fixed through cooperation of concave grooves and convex grooves. Sleeve grooves allowing fluid to flow are formed in the positions, flush with the position of labyrinth flow channels on the mounted adjusting labyrinth type discs, of the guide sleeve, and through flow holes are formed in the sleeve grooves. The discs are directly restrained and fixed through the self structures and the guide sleeve, the processing and assembling process is simplified, and cost is reduced. The discs are movably restrained, only the damaged discs are replaced in the repair process, and the repair cost is reduced. Hard alloy is overlaid or sprayed to the inner wall of the sleeve, and the overall service life of a valve element assembling part is prolonged. On the premise of guaranteeing that that the adjusting labyrinth type disc assembling part meets flow performance, the assembly precision is improved, the valve production efficiency is improved, the service life of the assembling part is prolonged, and the production and repair cost is reduced.

The invention discloses a tea seed grading winnower and belongs to the technical field of grading winnowing equipment of agriculture and forestry products. The tea seed grading winnower comprises a blower, an air duct, an air inlet pipe, a dust collector and an air return pipe, which are connected in sequence, wherein a feed hopper is mounted at the feed end of the air duct; a full seed discharging hopper, a non-full seed discharging hopper and a impurity and husk discharging hopper are arranged below the air duct in sequence; a feed adjusting mechanism is arranged at the bottom of the feed hopper; the feed adjusting mechanism comprises a feed adjusting plate, a handle, a locking handwheel and an arc-shaped guide plate; the feed adjusting plate is fixedly connected with the handle to form an included angle; a locking hole is formed in the handle; and a locking handwheel shaft passes through the locking hole and an arc-shaped guide groove in the arc-shaped guide plate. According to the physical characteristic that full seeds, non-full seeds, moldy tea seeds and empty husks have different densities, the tea seed grading winnower adopts strong wind to blow seeds or empty husks, which have different densities, to move different distances, and a plurality of different regions are divided according to the distances of falling points, so that the four kinds of materials are sorted accurately.

The invention belongs to the technical field of stop valve structures, and discloses a three-stage throttling valve. The three-stage throttling valve comprises a valve body with a pressure inlet and apressure outlet, a passage opening controlled by a valve core to be opened or closed is arranged in the valve body to communicate the pressure inlet and the pressure outlet, produced gas enters the valve body from the pressure inlet and exits from the pressure outlet through the passage opening, the produced gas enters the pressure inlet with low pressure and exits from the pressure outlet with high pressure, the pressure inlet is provided with a throttling part I for throttling and depressurizing, a throttling part II for removing impurities of the produced gas through opposite flow is arranged at the passage opening, and the valve core is provided with a throttling part III which protects the valve core through staged depressurization.

The invention discloses a smelting reduction furnace, which comprises: a horizontal furnace body, including a furnace shell, a water-cooled wall and a furnace lining which are sequentially stacked from the outside to the inside; A slag outlet is provided on the taphole and the other end wall, and a flue is arranged on the peripheral wall of the horizontal furnace body close to the taphole, and the taphole, the slag outlet, and the flue are respectively It communicates with the furnace hearth of the horizontal furnace body; the feeding unit includes a gas injector and a fuel injector, and the gas injector can movably penetrate into the furnace hearth from the top of the surrounding wall of the horizontal furnace body, so The fuel injector can movably penetrate into the furnace from the side of the peripheral wall of the horizontal furnace body. The smelting reduction furnace improves the smelting reduction reaction rate, the utilization rate of secondary combustion heat and the output efficiency of metallic iron, reduces the content of FeO and metallic iron in the discharged slag, and reduces the erosion of FeO in the slag to the furnace lining damage and prolong the service life of the furnace lining.

The invention discloses a self-conveying water-stone separation type flood drainage aqueduct and a construction method, and belongs to the technical field of disaster prevention and control for geotechnical engineering. The self-conveying water-stone separation type flood drainage aqueduct comprises an aqueduct inlet, an aqueduct outlet, a self-conveying aqueduct body, foundations, supporting columns and a water outlet pipe. The self-conveying aqueduct body is composed of a double-layer U-shaped channel, water turbines, driving wheels, driven wheels, belts and a conveyer belt, wherein the middle of the bottom of the upper layer of the double-layer U-shaped channel is provided with rollers, the two ends are provided with carrier rolls, the carrier rolls are provided with the driven wheels in a nesting manner, the water turbines are installed on the lower layer of the double-layer U-shaped channel and provided with the driving wheels in an embedding manner, the belts connect the drivingwheels with the driven wheels, and the rollers and the carrier rolls are sleeved with the conveyor belt. The foundations are built at the intersection of a gully and a highway, the supporting columnsare built on the foundations, the self-conveying aqueduct body is erected on the supporting columns and connected with the aqueduct inlet and the aqueduct outlet, and the water outlet pipe guides water into a gutterway. According to the self-conveying water-stone separation type flood drainage aqueduct, water and stones in a debris flow are largely separated, the kinetic energy of the water is utilized to drive the conveyor belt to convey the stones, the situation that stones settle in the aqueduct and block the aqueduct, the debris flow spills over, and the normal use of a line is affected isavoided, and the safety of pedestrians and vehicles is protected.