159 results about "Bed load" patented technology

The invention relates to a catalytic decomposition low-concentration hydrogen peroxide reactor and a combustion chamber, which solve the problem that in the prior art, price is expensive, safety is not high, freezing point is high, decomposition temperature and ignition temperature are high, purpose is single and the like. A multilayer low-bed-load and pre-contact fine silver net catalysis bed for catalytic decomposition of 40%-70% of hydrogen peroxide is adopted, and service life is greatly prolonged. Radial holes or/and axial holes are arranged on a laryngeal casing of the catalytic decomposition low-concentration hydrogen peroxide reactor for using in underground reactor oil recovery by heating, mining and marine accident self rescuing and a life support system of spaceships and rocket oxidizer storage tank supercharging. The catalytic decomposition low-concentration hydrogen peroxide combustion chamber is provided with a plurality of radial spraying holes for spraying diesel oil or kerosene, an electronic spark plug for ignition, a combustion chamber body with the 40%-70% of hydrogen peroxide serving as a regeneration cooling agent and two kinds of spraying tubes, and the catalytic decomposition low-concentration hydrogen peroxide combustion chamber can be used for thrust chamber gas spraying thrust of a plurality of military projects and road ice and snow removal by heat and crude oil pollution.

The invention relates to a system for measuring bed load silt discharge of a river model test. The system is arranged on a river model; a sand sinking pit (21) which vertically stretches downwards from an upper surface of a river sub-model is arranged on the river sub-model of the river model; at least one sand collection hopper (22) is arranged along a cross section of the river sub-model on the sand sinking pit (21); a larger opening end of each sand collection hopper (22) faces upwards and a small opening end faces downwards; a sand carrying basket (23) penetrates through the sand collection hopper (22) through a hanging rope (25) and is suspended on a weight measuring mechanism (24); and the weight measuring mechanism (24) measures underwater weight of the sand carrying basket (23) in a no-load manner and the underwater weight of the sand carrying basket (23) and the overall sand in the basket at different moments so as to obtain the bed load silt discharge of the river model test. According to the embodiment of the system, the bed load silt discharge of the river model test can be measured rapidly accurately in real time, thereby providing an accurate data basis for river research.

The invention discloses a method and a device for simulating bottom sludge erosion and transmission feature in a rectangular trough. The method comprises the following steps of: applying different constant current scouring forces to the surface of columnar bottom sludge with an un-disturbed structure in the vertical direction, so that the columnar bottom sludge is eroded under the actions of different hydrodynamic forces, and simulation of the bottom sludge erosion under the disturbance of different hydrodynamic force strengths is realized; and respectively capturing a suspended load and a bed load in the eroded bottom sludge at the same time, so that simulation of the transmission feature of the eroded bottom sludge is realized. The device comprises a water inlet tank, the flat elongated trough, a water outlet tank, a water storage tank, a columnar sludge sample pipe, a bed load sand capturing device and a suspended load sand capturing device. According to the method and the device, the problems that the external force condition is uncontrollable and the original structure of the bottom sludge is kept are solved by using a constant acting force produced by a constant water level difference on the surface of the bottom sludge; and the bed load and the suspended load produced after the bottom sludge is suspended are effectively collected by adopting different devices respectively, so that an effect of simulating the bottom sludge erosion is achieved.

The invention relates to a bed load sediment feeding device for river engineering model test, which belongs to the technical field of testing of river engineering models in water conservation and hydropower engineering. The bed load sediment feeding device for river engineering model test mainly comprises a support, a sediment container, a throttle valve and an automatic control platform for sediment transport rate, wherein the sediment container is mounted at the top of the support and used for containing sediment and allowing the sediment to automatically slip out from a bottom sediment leak under the action of gravity, the throttle valve is mounted at the bottom sediment leak of the sediment container, slip quantity per unit time of the sediment is obtained by controlling openness of the throttle valve, and the automatic control platform for sediment transport rate is located below the sediment container, supported at the bottom of the support and used for automatically controlling the sediment transport rate. The bed load sediment feeding device for river engineering model test has the advantages of high automation level, high precision and high adaptability to complex test conditions, and has significant production, application and promotion values.

A load detector 1 is provided with a base plate portion 2 to be disposed on a bed installation surface 55, a leg disposing plate portion 13 on which a caster 51 as a leg portion of a bed is to be disposed, the leg disposing plate portion 13 being provided at a tip end portion of a cantilever portion 7 supported generally horizontally in a state in which the leg disposing plate portion 12 is away from the bed installation surface 55, and a distortion detection sensor R attached to the cantilever portion 7, the distortion detection sensor R detecting a distortion of the cantilever portion 7 and outputting a signal to be used to detect a bed load.

The invention discloses a seepage failure testing device and method for a seam pipeline between pipe bags and dam bags, and relates to the field of physical model tests of water conservancy projects. The device adopts the structure that a cantilever is horizontally arranged at the upper part of a support, one end of the cantilever is connected with a water-outlet tank, and the other end of the cantilever is connected with a water-inlet tank; a lower-end hose of the water-outlet tank is connected with a suspended load sand-collecting tank, and a lower-end hose of the water-inlet tank is connected with a sand tank; a water tank is connected between the suspended load sand-collecting tank and the sand tank, a bed load sand-collecting tank is connected to the water tank near one side of the suspended load sand-collecting tank, pipe bag fabric is stuck on the inner wall of the water tank, a plurality of water pressure sensors are arranged in the water tank, and are connected with a data collecting card, and the output end of the data collecting card is connected with a computer; a sand filling chamber, a steady flow chamber and a water inlet chamber are sequentially arranged from one side near the water tank to one side far away from the water tank in the sand tank. The seepage failure testing device and the testing method realize the purposes of simple device, convenience in operation and low processing cost, are economic and applicable, and are suitable for small physical model tests.

In a bed having a load detection function, a load detector attached to a bed main body includes a load cell provided at a site which is positioned at any location on a load transmission path extending from a bed surface-forming portion to a bed installation surface, and at which a load from the bed surface-forming portion side is received and the load is transmitted to a configuration member of the installation surface side. The load cell includes a load-receiving member, and a base body which is separated from the load-receiving member and to which the load from the load-receiving member is applied. The load-receiving member comes into contact with the base body, the load from the load-receiving member acts on the base body, and the resulting strain is detected by a strain sensor.

The invention aims at providing a method for converting and storing solar energy with low-hydration magnesium chloride as an energy storage working medium and relates to effective utilization of magnesium in salt lakes and storage and conversion of solar energy. The method particularly includes: in the periods when solar radiation is sufficient in the daytime, the solar radiation is received through a flat solar thermal collector, heat is transferred to a one-time dehydration fluidized bed loaded with bischofite (MgCl2 6H2O), the temperature of the bed is increased to the dehydration temperature, then the MgCl2 6H2O loses the crystal water to form the low-hydration magnesium chloride (MgCl2 4H2O), conversion from the solar energy to chemical energy is achieved, and water vapor generated by the reaction is delivered to a steam turbine set to generate electricity; and in the nighttime or when the solar radiation is insufficient, the water vapor is enabled to enter the dehydration fluidized bed where the low-hydration magnesium chloride is stored, under the condition that the temperature and the partial pressure of the water vapor are controlled, the low-hydration magnesium chloride is enabled to be subjected to hydration reaction, the number of crystal water molecules is increased to form MgCl2 6H2O again, absorption (hydration) heat is released, the conversion from chemical energy to thermal energy is achieved, and the released heat is transferred to a heat preservation water tank so as to generate water vapor to drive the steam turbine set to generate electricity.

The invention discloses a blocking overflow dam structure and belongs to the technical field of design and manufacturing of hydraulic structures. The blocking overflow dam structure is low in requirement for infrastructures, simple in construction and low in building manufacturing cost. The blocking overflow dam structure comprises stone blocks and a meshed permeable framework, the stone blocks are arranged in the meshed permeable framework, and the blocking overflow dam structure is fixed in a river way or a ditch where the blocking overflow dam structure needs to be arranged outside through the meshed permeable framework; water flowing along the river way or the ditch permeates gaps between the meshed permeable framework and the adjacent stone blocks so as to flow through the blocking overflow dam structure, and solid matter or bed load mixed in water flow is filtered by the blocking overflow dam structure and is blocked at an upstream face of the blocking overflow dam structure.

The invention relates to the field of simulated loading control of load applied on numerically controlled rotary tables, in particular to a working condition-simulating numerically controlled rotary table test-bed loading control system and a control method. The working condition-simulating numerically controlled rotary table test-bed loading control system is characterized in that the working condition-simulating numerically controlled rotary table test-bed loading control system comprises a hydraulic loading system for simulated static load, an excitation system for simulated dynamic load and a simulated loading control system. The working condition-simulating numerically controlled rotary table test-bed loading control system and the control method can truly simulate static load applied on a numerically controlled rotary table by a workpiece to be machined under various working conditions and dynamic load applied on the numerically controlled rotary table by different models of machine tools in the process of machining, provide the design, production and optimization experiment and research of numerically controlled rotary tables with beneficial references and first-hand data and help to increase the precision and rigidity of numerically controlled rotary tables; the whole loading control system is easy to implement and convenient and easy to operate, the test preparation period in need is short, and the test cost is low.

The invention discloses a local scouring forecast method of a coastwise wind-electricity tower footing of a muddy coast, which comprises the following steps of: constructing a two-dimensional tidal current mathematical model and a two-dimensional wave mathematical model of an engineering sea area respectively, analyzing the hydrodynamic condition of the engineering sea area by the two-dimensional tidal current mathematical model and the two-dimensional wave mathematical model and providing oceanic kinetic parameters for determining the maximum depth of the local scouring of the wind-electricity tower footing; selecting Jones and Sheppard formulae which are suitable for bed load which is silver sand particles and an Hanhaiqian formula as a fundamental formula for estimating the local scouring depth of the wind-electricity tower footing of a coastwise wind farm of the muddy coast; and forecasting the maximum depth of the local scouring of the wind-electricity tower footing of the coastwise wind farm of the muddy coast by adopting the modified formula. The invention can better reflect the motion rules of the tidal current and the wave of a prototype, can provide the reliable oceanic kinetic parameters for the calculation of the local scouring depth of the wind-electricity tower footing and has a reasonable and credible calculation result.

A process for treating the city sewage features the integration of chemobiotic flocculation integrated deeply for higher efficiency with suspension filler bed loaded by suspended particles as filler for higher microbe concentration in biochemical reactor. Its advantages are high effect, low cost and less possesses ground area.

The invention discloses a riverbed bed load vertical section separating model test device and a use method thereof. The device comprises an external cuboid water tank whose top is provided with an opening; the external water tank is provided with an internal water tank therein; the bottom of the external water tank is provided with a long support and a short support; the upper side of the long support and the short support is provided with a conveyer belt; the internal water tank is placed on the conveyor belt; the internal cuboid water tank is provided with multiple transparent glass marbles with 2 to 3 kinds of different particle sizes therein; the top of the external water tank is provided with a water inlet, and the bottom is provided with a water outlet; the top of the internal water tank is provided with an internal water tank water inlet which passes through the external water tank sidewall; one side surface of the external water tank is provided with a laser and a reflector, and the other side surface is provided with an automatic digital camera which can regularly photograph the laser scanning surface at certain frequency. By means of the device and the method, the problem of failure in long time scale bed load motion simulation due to length limitation of indoor water tank in common indoor long water tank bed load vertical section separating test devices.

A self-controlled type rubber dam with a wear-resistant steel plate comprises a reinforced concrete groove, a rubber dam body anchored to a bottom plate of the groove, and a water supply and drainage pipeline arranged from the upstream side to the downstream side. The wear-resistant steel plate with a hinge support is arranged above the groove. A hinge supporting base is arranged between the wear-resistant steel plate and a step on the upstream side of the groove. A roller is arranged at the tail end of the downstream side of the wear-resistant steel plate. A separated channel is arranged in a riverbed between the groove and the water drainage section of the downstream side of the water supply and drainage pipeline. An anti-sliding ridge is arranged in the separated channel. Water stop rubber is arranged below the anti-sliding ridge and connected with a floating ball on the water surface through a lacing. The rubber dam body supports the wear-resistant steel plate to stop water and does not make contact with water current directly, abrasion and impact to bed load sand grains are avoided, the structure is simple, and construction is easy and convenient. In the flood period, the rubber dam body collapses into the groove, the wear-resistant steel plate directly serves as a groove cover plate after falling off so as to protect the rubber dam body and prevent silt. Meanwhile, a floating ball system of the rubber dam can automatically regulate the rubber dam body for sluicing.

The invention relates to a deepwater negative-pressure desilting system. The deepwater negative-pressure desilting system comprises a desilting pipe and an air supply pipe, wherein the desilting pipe is arranged in water, the top end of the desilting pipe communicates with an output pipeline, and the bottom end of the desilting pipe is arranged in a part to be desilted in water; the air supply pipe is installed on one side of the desilting pipe, the top end of the air supply pipe is connected with an air compressor through an air hose, and the bottom end of the air supply pipe is provided with an air supply inflator which communicates with the air supply pipe and the desilting pipe. The deepwater negative-pressure desilting system has the predominant effects that the purpose of underwater desilting can be achieved through the deepwater negative-pressure desilting system, construction is simple, suspended loads and bed loads at the bottom of a reservoir can be cleaned under the requirements of environmental protection and pollution prevention, and the cleaning effect on aggregated rocks with different grain sizes can be achieved at the same time by changing the pipe diameter of the desilting pipe and the pore diameter of a filter screen at the end of the desilting pipe, so that the system is applied to exploitation of underwater gravel with the different grain sizes, and the problems that desilting equipment is simple and crude and the operation process is tedious in the prior art are solved.

The invention relates to a bottom-sitting all-weather bed load sediment real-time monitor and a measuring method thereof. The monitor comprises an outer barrel of a sand collecting barrel and an inner barrel, arranged inside the outer barrel, of the sand collecting barrel, wherein a signal output end and an underwater pressure gauge which contains a smart device and connected with an outer control device are arranged at the bottom of the outer barrel; the top end of the underwater pressure gauge is fixedly connected with the bottom end of the inner barrel; a sand discharge pump is arranged in the inner barrel; a sand flushing pump is arranged outside the sand collecting barrel; controlled ends of the sand discharge pump and the sand flushing pump are connected with the outer control device; and a barrel cover with an annular cross section is arranged at the top end of the outer barrel, a barrel cap is arranged above the barrel cover, and a sand filling port is formed between the barrel cap and the barrel cover. According to the monitor and the measuring method thereof, the design is reasonable, the underwater pressure gauge and the outer control device are matched for use, so that continuity and automation for bed load measurement are achieved, change of the bed load sediment in the river bottom can be measured accurately without influence of environmental factors such as water depth, wave, external sediment and the like, continuous sampling of the bed load sediment in rivers is achieved, and the monitor and the method are suitable for measurement work of bed load sediment discharge of rivers with fine particle sediment.

The invention discloses a saturated sand transportation theory-based sandy inland waterway back silting quantity forecasting method. The method comprises the following steps of: 1, dividing back silting calculation units; 2, carrying out statistical analysis on an observed sediment quantity of scour-silt in each unit; 3, establishing and verifying a two-dimensional water flow model, and calculating water levels, a flow speeds and flow directions along the way; 4, substituting the calculation result in the step 3 and a substrate median size into a bed load sand transportation rate formula so asto carry out statistical analysis on a net sand transportation quantity; 5, comparing the observed sediment quantities of scour-silt with the net sand transportation quantity, and adjusting calculation parameters of the rated bed load sand transportation rate formula to ensure that the observed values and space distribution thereof are identical with calculated values; and 6, forecasting a back silting amount of a to-be-constructed waterway according to the step 4 by adoption of the water levels, flow speeds and flow directions of the units in the step 3 and the parameters of the sand transportation rate formula. The method is concise and efficient, is capable of overcoming the defect that the past bed load back silting prediction is difficult to avoid field bed load observation and indoor simulation and then enriching the inland waterway back silting forecasting method.

The invention provides a bed load transport rate measurement system and method based on a cross correlation method. The measurement system comprises a water depth sounding device and a shore-based control device, wherein the water depth sounding device comprises a depth sounder hull, the depth sounder hull is mounted above an anti-collision floating ring through a supporting rod, and the bottom portion of the anti-collision floating ring is equipped with a pusher. The measurement method comprises steps that the section is measured through combination of field survey and remote sensing image design, and the measurement route of the water depth sounding device is set; continuous vertical underwater terrain measurement of a preset river section at two different time periods is carried out bythe water depth sounding device; the underwater terrain data is transmitted to the shore-based control device in a wireless mode, the sand wave moving speed and the average sand wave height are acquired through a terrain data analysis unit of the shore-based control device; the sand wave moving speed and the average sand wave height are substituted into a formula to acquire the single wide bed load transport rate, and observation and analysis of the bed load transport rate without disturbing the bed load transport process of natural river beds can be realized.

The invention belongs to the technical field of hydropower station flood discharge, and discloses a three-dimensional numerical simulation method for a downstream scouring process of a flood dischargegate of a hydropower station when a hydropower station is stuck, which comprises the following steps: establishing a bed load sediment transport rate formula based on water flow randomness and bed sand distribution randomness based on riverbed sediment particle motion basic characteristics; based on the UDF macro function, conducting secondary development on Fluent software, extracting the bed surface node water flow shearing force, and calculating the bed surface sediment transport rate; and according to a riverbed scouring and silting balance principle, converting the change of the sedimenttransport rate between the nodes into the change of the node elevation along with time, so that the moving boundary grid nodes are controlled to move, and three-dimensional numerical simulation in the scouring process of the scouring pit is realized. According to model actual measurement data verification, a simulation result is basically matched with an actual measurement value; in the forming process of the scouring pit, the shear stress distribution of the bed surface is continuously changed along with the scouring deformation of the bed surface, namely the shear stress of the bottom wallsurface of the scouring pit at the initial scouring stage is larger, and the shear stress of the upstream slope wall surface in the scouring pit at the middle and later scouring stages is larger.

The invention discloses a transfer bed for medical use and relates to the field of medical devices. The transfer bed includes a bed board, support legs are arranged below the bed board, the two side faces, opposite to each other, of the bed board are provided with baffles, and the two baffles are located in the width direction of the bed board; a support block horizontally moving in the width direction of the bed board is connected between the two baffles, a transfer plate horizontally moving in the width direction of the bed board is arranged right above the support plate and located betweenthe two baffles, a gear is arranged between the transfer plate and the support plate and fixedly connected with a rotation shaft, and one end of the rotation shaft extends outside the corresponding baffle; the grinding-teeth support plate and the transfer plate are both provided with grinding teeth meshed with the gear; the several rows of grinding teeth on the transfer plate are distributed in the width direction of the transfer plate, and the several rows of grinding teeth on the support plate are distributed in the width direction of the support plate. The problem that in the prior art, when a transfer bed is used for transferring a patient, the patient needs to be uplifted directly and move back and forth between the transfer bed and an examination bed and thus secondary injuries to the patient are easily caused is solved.