44results about How to "Less basic investment" patented technology

The present invention discloses a continuous flow shortcut nitrification-anaerobic ammonium oxidation biological denitrification method based on granular sludge, and an apparatus. The method comprises: 1) carrying out sludge inoculation culture, and carrying out an active sludge adaptation period; 2) starting a shortcut nitrification-anaerobic ammonium oxidation reaction; 3) performing an anaerobic ammonium oxidation granular sludge formation and growth period; and 4) performing a stable operation period of a granular sludge continuous flow system. The apparatus comprises a water inlet tank, a bioreactor, a sedimentation tank and a hydraulic screen filter, wherein the water inlet tank, the bioreactor, the sedimentation tank and the hydraulic screen filter are sequentially communicated, the influent of the water inlet tank is communicated with high ammonia nitrogen wastewater, the effluent is communicated with the bioreactor, the concentrated sludge on the bottom of the sedimentation tank is communicated with the bioreactor through a sludge reflux pump, a fixation filler, a stirrer, a filtration screen and an aeration head communicated with an air compressor are arranged inside an anoxic reactor, the sedimentation tank is provided with a clear overflow port communicated with the hydraulic screen filter through a pipeline, the effluent of the hydraulic screen filter is the final effluent, and the retained granular sludge refluxes to the bioreactor.

The invention relates to a rock-socketed single pile foundation of offshore wind turbines in batholith seabed and a construction method thereof. The rock-socketed single pile foundation comprises a steel pipe pile inserted in a moderately weathered batholith layer. An annular groove located at the periphery on the lower end portion of the steel pipe pile is formed in the batholith. An inner casing is nested within the lower end of the steel pipe pile. A gap is reserved between the inner casing and the inner wall of the steel pipe pile. The inside of the annular groove and the gap between the inner casing and the inner wall of the steel pipe pile are both filled with a high-strength grout having initial setting time of no less than 8 h. The rock-socketed single pile foundation of offshore wind turbines in batholith seabed in the invention is stable and reliable, ensures that the single pile foundation can be tightly bonded with the surrounding batholith, and reliably embedded in the moderately weathered batholith layer. The impact of a large boring diameter and a borehole perpendicularity error on the gradient of the single pile foundation and the problem of local stress concentration of the rock-socketed section of the steel pipe pile due to unevenness of the bored rock surface are reduced. Moreover, the cubic quantity of backfill concrete for the rock-socketed section can be lowered. The critical technical problem of use of the single pile foundation in the batholith seabed is effectively solved.

The invention relates to a preparation method of a fireproof heat preservation partition wall board. By limiting the slurry raw material proportion of the fireproof heat preservation partition wall board and adopting solidifying and maintaining technologies in the preparation process, the obtained fireproof heat preservation partition wall board has the performance advantages of being light, rapid in setting and hardening, high in strength, capable of achieving heat preservation and thermal insulation, preventing fire, resisting aging and resisting acid and alkali and the like, has the environmental protection advantages of being free of toxin, harm, pollution and radiation and the like, and is a novel multifunctional building material.

The present invention provides an MFC preparing method which uses the aerobic microorganism as the cathode catalyst, the catalyst which adopts the microorganism as the cathode successfully actuates the biological cathode biological fuel cell which has a double-cell structure, the electrode material is conductive carbon fiber and the anode takes the glucose as substrate, the cathode takes NaHCO3 as inorganic carbon source and the perforated pipe aerates. The result showed that after 9d actuation the battery voltage gets to 0.324V(R=500 omega), the maximum power density is 24.7W / m<3> when the aeration amount is 300Ml / min, as the metal catalyst is saved and the fabricating cost of MFC is reduced the application of MFC in project is provided with a novel approach and possibility.

The invention discloses an integrated device for deodorization and sewage treatment in a municipal sewage plant. The integrated device comprises a semi-hermetic gas collection building mounted on an odor source, an air blower and an aeration tank, wherein malodorous gas is collected in the semi-hermetic gas collection building; a ventilation opening and a gas pipeline are arranged above the semi-hermetic gas collection building; the gas pipeline conveys the malodorous gas to an aeration pipeline through the air blower; and the aeration pipeline conveys the malodorous gas to the aeration tank. According to the invention, through the method, the design, operation and management of a deodorization facility can be simplified, the investment and operation cost is reduced, the various malodorous substances can be effectively processed, and the processing effect is good. An odor collection pipeline can be connected with the original blast aeration equipment, so that the amount of construction engineering is reduced, and the integrated device and the technology are very suitable for upgrading and reconstruction of deodorization of the built sewage treatment plant and the construction of the integrated deodorization facility of the newly-built sewage treatment plant.

The invention discloses a novel diving jet-type biological aerated filter, comprising a biological filter, wherein a filter filler part and a filter material layer are arranged in the biological filter; a water inlet tube is arranged at the upper end of the biological filter, and a water outlet tube is arranged at the lower end of the biological filter; a bridge is installed at the top end of the biological filter; a diving jet-type aerator which is fixed via a hoisting chain is installed on the bridge; and the main machine of the diving jet-type aerator is installed below the filter filler part. Via the mode aforementioned, the novel diving jet-type biological aerated filter disclosed by the invention is capable of effectively improving gas-liquid mixing effect, realizing uniform gas distribution, increasing oxygen utilization rate, creating an environment suitable for growth of microbes which are used for oxygenolysis of organic matters, improving effluent treatment effect, and saving space and construction cost.

A process of extraction of high-purity soluble cerium hydroxide from a fluorine-carbon-cerium mixed rare earth carbonate comprises the steps: taking the mixed rare earth carbonate, firstly dissolving by an acid, then removing SO4<2->, next carrying out hydrolytic precipitation of cerium to generate cerium hydroxide, then dissolving cerium hydroxide in the hydrochloric acid medium to form a Ce<4+> solution with the hydrochloric acid weak acidic medium, controlling conditions, precipitating again in the weak acidic medium to make a lot of metal impurities remain in the solution, and thereby obtaining cerium hydroxide which contains the quite low content of non rare earth impurities and can be easily dissolved in a nitric acid medium. Hydrolytic precipitation of the rare earth adopted by the invention is complete, so a large amount of alkali is saved; an oxidant is added to allow cerium to be greatly oxidized into tetravalent cerium, and thus achievement of hydrolytic precipitation is facilitated, so as to realize an effect of high percentage extraction of cerium. The process generates a small amount of waste water, is simple, has low preparation cost, is expected to large-scale industrial production, and has certain economic benefits and quite good social benefits.

The invention discloses an electrode type molten salt heater. The electrode type molten salt heater is characterized by comprising an electrode bracket, control shields, three-phase electrodes, neutral electrodes, a power interface, a screw, a movable type connector and a supporting plate which is positioned in an opening of a lower semi-elliptical end socket, wherein the three-phase electrodes are arranged on the inner part of a barrel body; the three-phase electrodes are distributed in the form of a regular triangle inside the barrel body and are supported by the electrode bracket; the upper parts of the three-phase electrodes are connected to the power interface; the circular-ring-shaped neutral electrodes cover the three-phase electrodes; the control shields are arranged between the three-phase electrodes and the neutral electrodes; and a motor drives the screw, the movable type connector and the control shields to rotate or lift, so that an opposite area between the three-phase electrodes and the neutral electrodes is changed. The electrode type molten salt heater has the advantages of being high in heating efficiency, compact in structure, small in floor space, excellent in safety performance and the like.

The invention discloses a light composition wall board, which comprises two plates which are face to face arranged, at least two elongated stiffeners are horizontally arranged between the two plates which are face to face arranged, one portion of the stiffener on one lateral portion of the plate is arranged in the plates, and the other portion is extended out from the lateral surface of the plate to form a projection, and the stiffener on the other lateral portion of the plate is arranged in the plate, and a groove which can contain the projection is formed between the stiffener and the plates which are face to face arranged. The composition wall board has lighter weight, which is convenient for field construction, improves construction efficiency, lowers production cost, meanwhile lowers integral load of buildings, lowers foundation investment, reduces accommodation area when in use, and increases utilized time of buildings.

The invention discloses a method for increasing the content of arachidonic acid in porphyridium and belongs to the field of aquaculture. Traditionally, porphyridium is cultured by an Allen culture medium in an open runway type large pond, so the growth is slow, the yield is low, pollution is easy to cause, the cost is high, basic investment is high, the content of arachidonic acid is low and the product quality is poor. According to the method disclosed by the invention, an illumination incubator is adopted for culture; in the later period of the culture, the illumination intensity and the illumination temperature are increased to force the porphyridium to accumulate arachidonic acid; sodium nitrate, ammonium chloride, ammonium bicarbonate, nicotinic acid alpha-naphthylacetic acid, magnesium sulfate, Na2EDTA and the like are replenished, and nutritional salts are replenished in batches in the later period of the culture, so that the nutrition requirements of the porphyridium are satisfied, the toxicity caused to porphyridium cells because of over-high concentration of the nutritional salts in the early stage due to one-time addition of the nutritional salts is overcome, the growth speed and yield of the porphyridium are greatly increased, and the content of arachidonic acid in the porphyridium is increased by 120%.

The invention discloses a biological aerated filter system and a sewage treatment method thereof. The biological aerated filter system is connected with a first-stage water treatment system, and is provided with a water inlet with a water intake valve, and a water outlet with a water discharge valve. The biological aerated filter system at least comprises a biological aerated filter group for treating sewage discharged from the first-stage water treatment system, a backwash fan, and an automatic control device, wherein the first biological aerated filter group at least comprises a plurality of down-flow biological aerated filters and up-flow biological aerated filters, which are adjacently connected sequentially in series; the backwash fan provides wind to adjust the aeration rate and the backwash aeration rate of each biological aerated filter in the system; the automatic control device controls the backwash fan to adjust the aeration rate of the biological aerated filter and opening and closing of the water intake valve and the water discharge valve. By adopting the method, the sewage sequentially passes through the plurality of biological aerated filters connected in series; the plurality of biological aerated filters are utilized to carry out interval treatment in an anoxic condition and an aerobic condition, so as to output qualified sewage.

The invention relates to a preparing apparatus of limestone slurry in a low place in flue gas desulfurization process and the method, a scale feeder and a wet ball mill setted on the groud, a limestone slurry pond setted under ground, the exit end of recycle liquid pump connected with a hydroclone located above the mill, the bottom outlet of the hydroclone connected with inlet of the mill by conduits, the overflow end connected with a limestone slurry storage bin. The bottoms of the storage bin Connected with delivery pipes, and connected with two-level the hydroclone by two-level circulating pump, bottom outlet of two-level hydroclone connected with inlet of the mill with conduits, overflow end of two-level hydroclone connected with two-level limestone slurry storage bin. The invention reduces cost of capital investment and equipment material, and is suitable to flue gas desulfurization project of heat power plant.

The invention provides an air rail transportation device for bulk materials. The air rail transportation device comprises a closed-loop air rail, a loading platform and an unloading platform, the loading platform and the unloading platform are separately positioned on the outer side of the closed-loop air rail, at least one rail car is arranged on the closed-loop air rail, and a hopper is mounted on the rail car. The closed-loop air rail comprises an ascending air rail and a descending air rail, the ascending air rail and the descending air rail are both inclined rails, the inclination angle of the ascending air rail is -a, the inclination angle of the descending air rail is a, and a is larger than 0 degree and smaller than 5 degrees. The air rail transportation device further comprises a main control system, and the main control system comprises a rail car walking control system, a loading control system, an unloading control system and a hopper control system. According to the air rail transportation device, the loading platform and the unloading platform are connected through the closed-loop air rail, meanwhile, the loading, unloading and transportation processes are controlled through the main control system, automatic control over bulk material conveying can be achieved, and the bulk material conveying efficiency is improved.

The invention discloses a water lute drainer which comprises a pool, water inlet pipes, a water replenishing pipe and a drain pipe. The water lute drainer is characterized in that a main partition wall is arranged in the pool so as to separate the pool into a drain tank and a water seal body which are not communicated, and the water replenishing pipe passes through the pool so as to be communicated with the interior of the water seal body; the drain pipe passes through the pool so as to be communicated with the drain tank, the water seal body comprises multiple water seal pools, and water seal partition walls are used for separating the adjacent water seal pools into separate units which are not communicated; multiple water inlet pipes pass through the side wall of the pool and are communicated with each water seal pool, and the top of each water seal partition wall is provided with a water overflowing device; and the main partition wall is provided with multiple drainage devices which are communicated with the water seal pools and the drain tank, and the height of the water overflowing device is lower than that of the drainage devices. The water lute drainer provided by the invention has the advantages that multiple water seal pools share a set of equipment, the structures of the multiple drainage devices are simplified, and the occupied space is obviously reduced.

The invention discloses a combined crane for docks and dock wharfs. The combined crane is characterized in that a fixed overhead crane and a movable overhead crane are combinedly arranged on a movable frame structure, wherein the frame structure is formed by welding track beams, column legs, lower beams, diagonal braces and struts; the fixed overhead crane is fixed on the two track beams through a planar hinge or a plate hinge; the movable overhead crane is fixed on the track beams; and the frame structure is fixed on a complete machine operating mechanism. Compared with the prior art, the combined crane has the advantage of coordinated hoisting of an overhead crane and a portal crane, infrastructural investment of an overhead trestle bridge is saved, working blind zone is effectively avoided, the overall stability of equipment is improved, and the combined crane is convenient to operate coordinatedly and has high working efficiency. Besides, the combined crane has irreplaceable advantage on wind resistance and seismic resistance, and is particularly suitable for docks and dock wharfs where long-distance overhead trestle bridges can not be arranged.

The invention relates to a method for preparing a fire-proof and heat-preserving partition board. By limiting the ratio of slurry raw materials of the fire-proof and heat-preserving partition board and the curing and curing process of the preparation process, the obtained fire-proof and heat-preserving partition board has light weight and fast setting and hardening. , high strength, heat preservation, heat insulation, fire prevention, anti-aging, acid and alkali resistance and other performance advantages, as well as environmental protection advantages such as non-toxic, harmless, pollution-free, and radiation-free, it is a new multi-functional building material.

The invention discloses a lightweight insulation combined wall body, which comprises a plurality of hanging posts and a concrete hanging wall panel which is installed on the hanging posts, wherein one sides of the hanging posts which are opposite to the concrete hanging wall panel are provided with cement foam decorating boards, and an insulation layer is arranged between the cement foam decorating board and the concrete hanging wall panel. The insulation layer and the cement foam decorating board are formed by combination of lightweight material, thereby the weight of the combined wall which is formed by the lightweight material is relatively light, and the invention is beneficial for solving the problem of wet working on construction sites, which promotes the construction efficiency, lightens the whole loading of buildings, and reduces basic investment of buildings.

The invention discloses a bulk cargo warehouse of a light structure. The bulk cargo warehouse includes a plurality of steel columns, pulleys, steel wire ropes, tension regulators and dustproof ventilating nets, the steel columns are erected on the ground, the steel columns are arranged in transverse and longitudinal rows, the tops of the steel columns are provided with the pulleys, and one same steel wire rope is wound on the pulleys at the tops of the steel columns in the same transverse row, wherein both ends of the steel wire rope are fixed to the ground; and the tension regulators are installed on the steel wire ropes, the corresponding dustproof ventilating net is installed between the two steel wire ropes on the adjacent two transverse steel columns, each dustproof ventilating net isprovided with two layers of metal nets and an intermediate layer dustproof material, wherein the two layers of metal nets are supported on the upper and lower faces of the intermediate layer dustproof material correspondingly, the dustproof ventilating nets are fixed to the steel wire ropes through buckle pieces, thus the intermediate layer dustproof material is clamped in the two layers of metalnets for fixing, and the side faces of the steel columns in the foremost and backmost transverse rows are closed. According to the bulk cargo warehouse of the light structure, external discharging ofdust can be controlled organically, installation is convenient, site limitation is avoided, wind resistance and shock resistance are achieved, the construction speed is high, construction investmentis 1 / 10 of original investment, and application and promotion are facilitated.

The invention belongs to the technical field of screening, particularly relates to an oil-free direct-driven vibrating screen and a mounting method thereof, and solves the technical problems of unreasonable design and the like in the prior art. The oil-free direct-driven vibrating screen comprises a vibrating screen frame which is fixed on an elastic supporting mechanism and is obliquely arranged, at least one vibrating motor is mounted above the two sides of the vibrating screen frame, a vibrating motor arranged above one side of the vibrating screen frame and a vibrating motor arranged above the other side of the vibrating screen frame are oppositely arranged, an output shaft of each vibrating motor is provided with an eccentric block and a universal coupling, with the two ends correspondingly connected to the output shafts of two vibrating motors which are oppositely arranged, which is transversely arranged above the vibrating screen frame in the width direction. The vibrating screen has the advantages of being simple in operation and maintenance and more compact in structure.

The invention relates to a flow electric vehicle system. The flow electric vehicle system is characterized by mainly comprising energy storing electrolyte exchanging stations arranged in various kinds of filling stations, standard high-energy-density energy storing electrolyte, electric vehicles adopting all-vanadium redox flow batteries and fixed charging piles. The characteristic that the energy storing electrolyte exchanging stations can conduct charging with large currents in a large-capacity mode for a long time is used, the standard high-energy-density energy storing electrolyte is prepared continuously, the standard high-energy-density energy storing electrolyte running out of electric energy in the all-vanadium electric vehicles is replaced by the fully-charged standard high-energy-density energy storing electrolyte, and therefore the all-vanadium electric vehicles obtain electric energy again within a short time. The exchanging time of the standard high-energy-density energy storing electrolyte can be controlled within several minutes, and the bottleneck that a pure electric vehicle is long in charging time is broken through.

The invention relates to a low-cost mineral processing technology for high-silicon high-calcium magnesite. The low-cost mineral processing technology comprises the steps of raw material crushing operation, grinding operation and flotation operation. The low-cost mineral processing technology is characterized by comprising the following specific technological steps that raw magnesite is crushed through a medium crusher, grinding operation is conducted through a closed circuit grinding assembly composed of a primary grate ball mill, a secondary grate ball mill and a spiral grading machine, an overflow product with the particle size of 70-80% of the overflow product being -0.076 mm is obtained and subjected to flotation operation adopting primary reverse flotation and primary obverse floatation, the magnesite comprising 46.50-47.00% of magnesium oxide, 0.80-1.50% of silicon dioxide and 0.90-2.00% of calcium oxide is obtained, wherein the concentrate yield is 82.00-90.00%, and the recovery rate is 81.45-85.00%. The low-cost mineral processing technology has the advantages that flotation operation adopting only primary reverse flotation and primary obverse floatation, thus, the grade of the silicon dioxide in the high-silicon high-calcium magnesite can be lowered to 0.5-1.5% from 2%, the content of silicon is lowered by 50% or above, the grade of the calcium oxide is lowered to 1-2% from 3%, and the content of calcium is lowered by 50% or so.

A process of extraction of high-purity soluble cerium hydroxide from a fluorine-carbon-cerium mixed rare earth carbonate comprises the steps: taking the mixed rare earth carbonate, firstly dissolving by an acid, then removing SO4<2->, next carrying out hydrolytic precipitation of cerium to generate cerium hydroxide, then dissolving cerium hydroxide in the hydrochloric acid medium to form a Ce<4+> solution with the hydrochloric acid weak acidic medium, controlling conditions, precipitating again in the weak acidic medium to make a lot of metal impurities remain in the solution, and thereby obtaining cerium hydroxide which contains the quite low content of non rare earth impurities and can be easily dissolved in a nitric acid medium. Hydrolytic precipitation of the rare earth adopted by the invention is complete, so a large amount of alkali is saved; an oxidant is added to allow cerium to be greatly oxidized into tetravalent cerium, and thus achievement of hydrolytic precipitation is facilitated, so as to realize an effect of high percentage extraction of cerium. The process generates a small amount of waste water, is simple, has low preparation cost, is expected to large-scale industrial production, and has certain economic benefits and quite good social benefits.

The invention relates to a special press machine for industrial detonators, which includes a frame, four columns are respectively located on the side of the frame and the lower ends of the four columns are connected with the lifting plate, and the upper parts of the four columns are connected with the hydraulic compensation machine head, the hydraulic compensation machine The head hydraulic cavity communicates with the hydraulic port of the gas-liquid booster mechanism through the oil pipe, the base of the main cylinder is fixed on the back of the worktable of the frame and the end of the piston rod of the main cylinder is connected with the lifting plate. Advantages: First, the equipment cost is low, the volume is reduced, and the basic investment is reduced; second, the characteristics of detonator pressure are fully utilized, the energy consumption of the equipment is reduced, and the noise is eliminated; the third is convenient automatic control, which is beneficial to the detonator automatic filling line technological progress.

The invention discloses a spray belt cooling water high and low temperature dual control system with a plurality of stainless steel water pools being connected in series. The spray belt cooling waterhigh and low temperature dual control system comprises a spray belt production line system and a smelting furnace insulation furnace system, wherein the spray belt production line system is equipped with a first cooling water temperature control system, the smelting furnace system insulation furnace system is equipped with a second cooling water temperature control system, the first cooling watertemperature control system and the second cooling water temperature control system both comprise the plurality of stainless steel water pools connected in series, and heat of a smelting furnace induction coil and / or an insulation furnace induction coil is used for heating when the cooling water temperature of the spray belt production line system is below the set temperature lower limit. Accordingto the spray belt cooling water high and low temperature dual control system with the plurality of stainless steel water pools being connected in series, the plurality of stainless steel water poolsare adopted to be connected in series, the temperature is easy to control, the waste belt rate is reduced, the cost is low, and no water seepage and water leakage exist; and the heat of the smelting furnace induction coil and / or the insulation furnace induction coil is taken as heat source to be used for heating when the cooling water temperature of the spray belt production line system is below the set temperature lower limit, energy sources are utilized sufficiently, and the spray belt fabricating cost is lowered.

The invention discloses a refractory industrial wastewater treatment system which comprises a regulating tank, a catalytic ozonation tank, a denitrification filter tank, a biological aerated filter tank, an intermediate water tank, an active sand filter tank, a sludge concentration tank and an ozone disinfection tank, the regulating tank is connected with the catalytic ozonation tank through a pipeline, and the catalytic ozonation tank is connected with the denitrification filter tank through a pipeline; the biological aerated filter is connected with the intermediate water tank through a pipeline, the intermediate water tank is connected with the active sand filter through a pipeline, the active sand filter is connected with the sludge concentration tank through a pipeline, the sludge concentration tank is connected with the regulating tank through a pipeline, and the ozone disinfection tank is connected with the active sand filter through a pipeline.Meanwhile, the invention also discloses a refractory industrial wastewater treatment method. The treatment process is simple, the effect is good, the occupied area is small, and up-to-standard discharge of the refractory industrial wastewater is achieved.

The invention discloses a biological aerated filter system and a sewage treatment method thereof. The biological aerated filter system is connected with a first-stage water treatment system, and is provided with a water inlet with a water intake valve, and a water outlet with a water discharge valve. The biological aerated filter system at least comprises a biological aerated filter group for treating sewage discharged from the first-stage water treatment system, a backwash fan, and an automatic control device, wherein the first biological aerated filter group at least comprises a plurality of down-flow biological aerated filters and up-flow biological aerated filters, which are adjacently connected sequentially in series; the backwash fan provides wind to adjust the aeration rate and the backwash aeration rate of each biological aerated filter in the system; the automatic control device controls the backwash fan to adjust the aeration rate of the biological aerated filter and opening and closing of the water intake valve and the water discharge valve. By adopting the method, the sewage sequentially passes through the plurality of biological aerated filters connected in series; the plurality of biological aerated filters are utilized to carry out interval treatment in an anoxic condition and an aerobic condition, so as to output qualified sewage.

The invention provides a pellet flue gas denitration method. The pellet flue gas denitration method comprises the steps: step A: injecting a liquid reducing agent into a gas duct between a pellet chain grate and a pellet rotary kiln; step B : using high temperature of the flue gas in the gas duct to vaporize droplets formed by the injected reducing agent into ammonia gas; step C: in the gas duct,conducting oxidation-reduction reaction on nitrogen oxides in the ammonia gas and the flue gas to reduce the nitrogen oxides to nitrogen and water, enabling the remaining unreacted flue gas to enter into an ammonia desulfurization tower together, recovering the ammonia gas and enabling the ammonia gas to enter the ammonia desulfurization tower together with the flue gas for recovery. The pellet flue gas denitration method has the advantages of less investment, less land occupation, low operating cost, and no other harmful gases.

A means for adapting different media of transmission link of network on physical layer, includes at least : a common interface, for connecting a interface of media access control (MAC) module ; more than one channels of different media ; a switch and control means , as a part of physical encoding sub-layer, for controlling auto-switch between channels of different media. FIFO synchronization for connecting the different media, are performed on the physical encoding sub-layer. It further includes : a detect and control means, for detecting state information of the channels and switching the channels according the state information; and a flow control means, outputing to a management interface of the switch and control means. The present invention can be applied to broadband computer network and the field of data communication to convenience network users, and the users are capable of flexibly selecting the type of physical media according their own requirement and conditions, and meanwhile the reliability of key-link in the network is ensured.