621results about How to "Improve closure" patented technology

A method and system for treatment of incontinence, urgency, frequency, and / or pelvic pain includes implantation of electrodes on a lead or the discharge portion of a catheter adjacent the perineal nerve(s) or tissue(s) to be stimulated. Stimulation pulses, either electrical or drug infusion pulses, are supplied by a stimulator implanted remotely, and through the lead or catheter, which is tunneled subcutaneously between the stimulator and stimulation site. For instance, the system and method reduce or eliminate the incidence of unintentional episodes of bladder emptying by stimulating nerve pathways that diminish involuntary bladder contractions, improve closure of the bladder outlet, and / or improve the long-term health of the urinary system by increasing bladder capacity and period between emptying. Moreover, the system and method allow a patient to be taught to receive one or more patterns of neural stimulation that can be prescribed by a physician and administered without continuous oversight by a clinical practitioner.

This invention relates to a aquosity industry anti-rust paint and its preparation method. According to weight it includes 8 to 11% aquosity acroleic acid modified epoxy, 33 to 40% acroleic acid latices, 0.1 to 0.3% defoamer, 0.05 to 0.15% wetting agent, 0.3 to 0.5% dispersant, 0.3 to 0.5% rust-resistant agent, 7.5 to 9% iron oxide red, 6 to 8% French chalk, 5 to 10% modified zinc phosphate, 2.5 to 10% trimerization aluminum phosphate, 3 to 3.5% precipitated baryte , 0.5 to 1% zinc oxide, 3 to 5% mica ferric oxide, alcohol ester twelve 1 to 2%, triethanolamine 1 to 2%, thickening agent 0.3 to 0.6%, preservative 0.05 to 0.1%, 5 to 20% de-ionized water, through pretreatment, color paste preparation and blending and adjusting to gain product.

The invention relates to recycled concrete and a preparation method thereof, and belongs to the technical field of building material concrete. The recycled concrete is prepared from, by weight, 140-150 parts of cement, 580-590 parts of recycled coarse aggregates, 260-270 parts of recycled fine aggregates, 95-105 parts of machine-made sand, 35-45 parts of river sand, 70-80 parts of mineral additives, 15-32 parts of hybrid fibers, 4.2-4.6 parts of concrete additives and 80-90 parts of water. The preparation method includes the steps: firstly, weighing various raw materials according to formula ratio, and mixing the coarse aggregates, the recycled fine aggregates, the machine-made sand and the river sand; secondly, adding the cement, the mineral additives and the hybrid fibers, uniformly stirring mixture, adding the concrete additives and the water, and uniformly stirring mixture to obtain the recycled concrete. The recycled concrete has the advantages that natural materials are saved, and environmental protection is achieved. The prepared recycled concrete is excellent in working performance and mechanical property, stable in quality and low in cost.

Adjacent to an opening portion 10 in an FISM system is provided an enclosure that encloses the operation space of a door and has a second opening portion 31 opposed to the opening portion 10. A curtain nozzle is provided above the upper edge of the opening portion 10 in the upper portion in the enclosure. A purge gas is supplied from the curtain nozzle along a direction from the upper edge to the lower edge of the opening portion. In addition, a gas outlet through which the purge gas flows from the interior of the enclosure out into the exterior is provided on the wall of the enclosure to which the purge gas flowing in the above described direction is directed, whereby an increase in the partial pressure of oxidizing gases in the interior of the FOUP is prevented.

The invention discloses a silicasol-acrylate emulsion compound primer, which comprises: 17-23% of water; 0.01-1% of dispersants; 0.01-0.2% of wetting agents; 0.3-0.5% of defoamers; 0.4-0.7% of anticorrosion bactericides; 1-1.5% of film-forming additives; 1-1.5% of antifreezing agents; 0.01-5% of rutile titanium dioxide; 2.5-5% of mica powder; 5-7.5% of precipitated barium sulfate; 20-27.5% of 1250-mesh heavy calcium; 19-26% of primer emulsion; 0.1-2% of pH adjusting agents; 11-19% of silicasol; 0.05-0.1% of silane coupling agents; 0.3-0.6% of thickening agents; wherein the percents are weight percents. The primer has low cost, and is not easy to peel or flake.

The invention provides a waterproof primer for buildings, which comprises the following components in percentage by weight: 40-60% of cationic emulsion, 0.5-1.0% of organosilicon adhesive force accelerator, 0.1-0.5% of defoaming agent, 0.01-0.3% of bactericide, 1-5% of film-forming assistant, 0.5-5% of thickening agent and the balance of water. By selecting the proper cationic emulsion, the alkali-curing substrate-sealed waterproof primer for buildings has the advantages of high alkali resistance, high sealing performance, high binding strength, excellent functional characteristics and strong adaptability to the substrate, and is easy and convenient for construction.

The invention relates to a novel modified emulsified paraffin concrete curing agent. Aiming at overcoming the defects that the existing concrete curing agent cannot reach the industrial standard on building material in terms of the water retention property and is unfavorable for environmental protection, the price is high and the decoration at later stage is also affected, the following technical proposal is provided: the curing agent is mixed with the following materials and water: 10-20% of vinyl acetate-ethene high molecular polymer emulsion, 0-5% of silicone resin modified acrylic polymer emulsion, 50-75% of paraffin emulsion, 0.1-0.5% of colloidal dispersing agent of the emulsified paraffin for stabilizing the emulsion state and 0.05-0.02% of special defoamer for emulsion. The invention has the beneficial effects that: the chemical curing method which is adopted for retaining water is an innovation for the traditional curing method; compared with the prior art, the method is labor-saving, time-saving and water-saving and is convenient to operate, can improve the film formation ability and the sealing ability of the emulsified paraffin emulsion, and can improve the bonding and absorbing capacity of the emulsified paraffin emulsion on the concrete surface, which leads the effective water retention rate of the coating film to reach more than 90%.

The invention discloses a separately-built type rainwater regulation system, which is arranged on a plurality of different confluence tubes. The regulation system comprises a first interception well, a second interception well, a regulation tube, and filter layers which are arranged in the first interception well and the second interception well respectively; the first interception well is provided with a sewage interception tube which extends to a sewage plant, a drainage port connected with a river channel, and an end water inlet connected with the end parts of the confluence tubes; and the second interception well is provided with an initial rain interception tube which extends to the regulation tube, and a side water inlet connected with the side parts of the confluence tubes. The separately-built type rainwater regulation system disclosed by the invention is suitable for the current situation as well as still convenient and realizable in case of an insufficient site; simultaneously, the interception effect can be greatly improved, and the intercepted drought flow sewage is intercepted in the sewage treatment plant and rainwater is intercepted in the regulation tube, so as to reduce pollution on the river channel, and improve the regulation capacity of urban drainage.

The invention discloses a dry weather flow and initial rainwater multifunctional catch basin for a combined network. The dry weather flow and initial rainwater multifunctional catch basin for the combined network comprises a basin body. The basin body is provided with an interceptor sewer extending to a sewage plant, an initial rainwater interceptor extending to a regulation and storage pipe, a water outlet communicated with a river channel, and a water inlet communicated with a combining pipe. The catch basin further comprises a filter layer disposed in the basin body. The filter layer is disposed between the water inlet and the water outlet so that a water inlet area close to one side of the water inlet and a water outlet area close to one side of the water outlet form in the basin body. The filter layer comprises a stop board disposed on the upper portion of the basin body, an overflow weir disposed on the lower portion of the basin body and a filter net disposed between the stop board and the overflow weir. The stop board is provided with through holes. The dry weather flow and initial rainwater multifunctional catch basin for the combined network has the advantages that the multifunctional catch basin is convenient to implement, the filter layer can be cleaned automatically, intercepting effect is improved, service life of the catch basin is prolonged, and river channel pollution is reduced.

Provided is a nitride semiconductor light emitting element having improved optical output with improved qualities, such as crystal qualities, of a nitride semiconductor laminated on an AlN buffer layer. An AlN buffer layer (2) is formed on a sapphire substrate (1), and on the buffer layer, nitride semiconductors of an n-type AlGaN layer (3), an InGaN / GaN active layer (4) and a p-type GaN layer (5)are laminated in sequence. On the surface of the n-type AlGaN layer (3), an n-electrode (7) is formed, and on the p-type GaN layer (5), a p-electrode (6) is formed. The n-type AlGaN layer (3) operates as a clad layer for confining light and carriers. The AlN buffer layer (2) is manufactured by alternately supplying an Al material and an N material at a growing temperature of 900 DEG C or higher.

The invention discloses a construction method of a drainage pipeline. The construction method comprises the following steps that 1, construction preparation is conducted; 2, a pipe groove is excavated; 3, a flat foundation and a cement solidified layer are constructed; 4, a prefabricated pipeline base is hoisted; 5, the pipeline is mounted; 6, a grouting closed body is constructed; 7, concrete backfill construction is conducted, specifically, formworks are inserted into formwork grooves in the two sides of the prefabricated pipeline base, meanwhile, same formworks are arranged at the two ends in an enclosing mode, concrete pouring backfill is conducted, and after concrete is initially set, the formworks are dismantled; and 8, gravel backfill is constructed. Positioning strips are connected to one sides of the formworks, positioning grooves are formed in the prefabricated pipeline base, supporting rods are inserted into the positioning grooves, and the ends, away from the positioning grooves, of the supporting rods are inserted into the included angle positions between the formworks and the positioning strips so as to abut against the formworks and the positioning strips simultaneously. The construction method has the beneficial effects that supporting to the formworks can be strengthened during concrete backfill, and the situation that the formworks are likely to be bent is avoided.

The invention provides a vacuum drainage anchor rod and a construction method thereof. The anchor rod is composed of an anchoring system and a vacuum drainage system; a thread is arranged at the frontend of each hollow anchor pipe, the middle rear part of each hollow anchor pipe is connected with a slurry outlet pipe, water permeable holes are formed in each hollow anchor pipe which is wrapped bya filter screen, a rubber sleeve valve and a geotextile bag sleeve an opening of each slurry outlet pipe, and each geotextile bag is clamped in the corresponding hollow anchor pipe through a hoop; the hollow anchor pipes are obliquely arranged in a slope, pressure grouting is conducted on the interior and the periphery of the front end of each hollow anchor pipe, and the hollow anchor pipes are anchored on backing plates through anchorage devices; a controller and a vacuum pump are installed outside the slope; moisture meters are embedded in the slope and connected with the controller; waterabsorbing pipes penetrate through sealing covers and are inserted into the hollow anchor pipes, connected with a drain pipe through sealing joints and connected with the vacuum pump; the controller and the vacuum pump are switched on, pumping starts to be conducted, a negative pressure zone is formed in each hollow anchor pipe, and the water in the slope enters a water suction pipe and then is discharged out of the slope. Accordingly, the structure is simple, anchorage and drainage can be achieved simultaneously, a good effect is achieved, construction is easy, and the manufacturing cost is low.

The invention relates to a pesticide adjuvant, comprising fat and oil. The fat and oil can be animal fat, vegetable oil or the mixture of them. The invention enhances the penetrability, stick-ability and blocking prosperity for pesticide of preventing disease and insects for branch and root during its producing process, which increases the preventing effect for disease and insect on branch and root. Mixed with pesticide or used individually to spray onto branch and root, the adjuvant can not only prevent disease and insect, but also can insulate cold, reduce water loss and promote tissue assimilation.

The invention discloses a sealing agent for aluminum and aluminum alloy anode oxide films and a preparation method for the sealing agent. The sealing agent comprises the following raw materials by lL: 15-20g of lanthanide nitrate, 0.6-0.8g of oxidizing agent, 0.25-0.3g of stabilizing agent and deionized water, wherein the additive amount of the deionized water is the amount of adding the deionized water until the volume is constant at 1L after the rest raw materials are mixed. According to the sealing agent disclosed by the invention, by utilizing the combined action of rare-earth metal and the oxidizing agent, porous layers of the anode oxide films can be effectively sealed, and the corrosion resistance of the anode oxide films is obviously improved. Meanwhile, the sealing agent disclosed by the invention does not contain chromium, nickel or fluorine, therefore, the human body cannot be harmed, and the environment cannot be polluted. The sealing agent is a green environmental-protection sealing agent. Moreover, the aluminum and aluminum alloy anode oxide films can be sealed at normal temperature, therefore, not only is the energy consumption reduced but also the operation convenient is improved. After being treated by the sealing agent disclosed by the invention, the aluminum and aluminum alloy anode oxide films are compact in surface structure, is in uniform golden yellow and is higher in bonding strength.

This invention is an improved method and device for treating varicose veins 200 or the greater saphenous vein 202. The method comprises the use of infrared laser radiation in the region of 1.2 to 2.2 um in a manner from inside the vessel 200 or 202 such that the endothelial cells of the vessel wall 704 are damaged and collagen fibers in the vessel wall 704 are heated to the point where they permanently contract, the vessel 200 or 202 is occluded and ultimately resorbed. The device includes a laser 102 delivering laser energy via a fiber optic catheter 300. A motorized pull back device 104 may be used. The laser is preferably operated under laser energy delivery conditions that substantially prevent the formation of coagulum on the energy emitting tip of the fiber.

The invention discloses a high-wear-resistance water-based plastic coating and a preparation method thereof. The invention belongs to the technical field of water-based paint. The invention solves thetechnical problems of insufficient adhesion and poor wear resistance of the existing water-based paint on the plastic base material. The product disclosed by the invention is formed by mixing a component A and a component B which are independently packaged when in use, wherein the component A is prepared from water-based resin A, water-based resin B, graphene and carbon nanotube composite slurry,pigments, fillers and other assistants and 5-10 parts of deionized water; and the component B is prepared from auxiliaries such as a curing agent and deionized water. According to the invention, thewater-based resin B is micromolecular resin; the water-based resin B has excellent permeability, partially permeates into a base material to form a film and increase the adhesive force, the water-based resin A is macromolecular resin and has good sealing film-forming property, and the resins with different molecular weights are compounded for use, so that the sealing property, the water resistance, the weather resistance, the mechanical property and the like of a coating film can be improved, and the coating film has excellent adhesive force.

The invention relates to the field of feed additives, in particular to a functional dairy cattle feed additive capable of preventing subclinical mastitis of dairy cattle. According to the functional dairy cattle feed additive, based on the total weight of the additive, the functional dairy cattle feed additive contains 2%-6% of organic selenium, 2%-6% of organic zinc, 4-8% of biological antioxidant, 8%-12% of mold adsorbent, 0.2%-0.6% of vitamins, 8%-12% of conventional additive for reducing the number of somatic cells, and 50%-80% of carrier. The invention provides the functional dairy cattle feed additive capable of preventing the subclinical mastitis of the dairy cattle and reducing the number of the somatic cells, the formula is reasonable, the nutrition is balanced, the number of thesomatic cells in the dairy cattle can be effectively reduced, the incidence of the subclinical mastitis of the dairy cattle can be reduced, the good development mechanism of a mammary system can be maintained, and the milk yield and the milk quality of the dairy cattle can be improved.

The invention provides a novel high-temperature resistance insulation coating. The coating comprises following components in parts by weight: 30 to 40 parts of poly alkyl aryl organic silicon resin, 40 to 60 parts of stuffing material, 1 to 28 parts of curing agent, 0.01 to 0.1 part of anti-settling agent, 0.01 to 0.7 part of antifoaming agent, and 0.01 to 0.3 part of levelling agent. The poly alkyl aryl organic silicon resin is poly methyl phenyl organic silicon resin or poly ethyl phenyl organic silicon resin; the stuffing material is composed of one component or a plurality of components selected from following components: silicon oxide, zinc oxide, alumina, and mica; and the curing agent is an epoxy polyamide curing agent. The novel high-temperature resistance insulation coating has the advantages of high thermal resistance, capability of being used at the temperature of 600 DEG C while still having good mechanic performance and stability, good insulation performance, and long service life. Furthermore, the preparation method of the coating is simple, and meets the requirement of saving cost.

The invention discloses a multicomponent alloy composite anticorrosive coating for a metal pipe / pipe fitting, which comprises a Zn-Al-Mg-RE multicomponent alloy layer and a hole-sealing finishing layer, wherein the hole-sealing finishing layer is coated on the surface of the Zn-Al-Mg-RE multicomponent alloy layer, the Zn-Al-Mg-RE multicomponent alloy layer comprises the following components by weight percentage: 56-83% of Zn, 16-41% of Al, 0.05-2.0% of Mg and 0.05-1.0% of Re, and the hole sealing finishing layer is an organic or inorganic coating layer. The multicomponent alloy composite anticorrosive coating disclosed by the invention has the advantages of low porosity, good anticorrosive property and the like.

The invention discloses high-adhesion water-based waterproof primer as well as a preparation method thereof and application thereof. The high-adhesion water-based waterproof primer is prepared from the following components in parts by weight: 25-32 parts of composite emulsified polymer emulsion, 2.8-3.3 parts of coupling film-forming agent, 0.6-1 part of hydroxyethyl cellulose, 15-18 parts of titanium dioxide, 4-6 parts of barium sulfate, 4-6 parts of calcium carbonate, 4-6 parts of talcum powder, 1-2 parts of dispersing agent, 0.5-1 part of wetting leveling agent, 0.2-0.4 part of de-foaming agent, 0.2-0.3 part of preservative, 1.8-2.2 parts of anti-freezing agent, 0.1-0.3 part of rheological agent, 0.1-0.3 part of pH regulator, 0.4-0.8 part of thickening agent and 24-31 parts of water. The high-adhesion water-based primer has excellent film-forming property, hardness, flexibility, water resistance, chemical resistance, sealing property, seepage force and adhesion, can be effectively dissolved and permeated into an organic silicon mould release agent on novel material plates such as an art ware, a cement product, a glass magnesium board and a special cast sectional material, is inseamless engagement with the board, and achieves the practical effect of improving coating quality and field construction environment. Moreover, the preparation method is easy, is low in cost, is simple in construction way, and reduces production and construction cost.

A liquid heat dissipation structure for a motor controller comprises a heat dissipation plate main body and a cover plate arranged in parallel with the heat dissipation plate main body; wherein the heat dissipation plate main body comprises a heat dissipation substrate, a side plate with a liquid inlet and a liquid outlet, a plurality of flow baffles, and a plurality of diversion fin groups; the side plate is perpendicular to the heat dissipation substrate, a semi-closure containing cavity is enclosed by the side plate and the heat dissipation substrate; and the flow baffles and the diversion fin groups are arranged in the containing cavity. The liquid heat dissipation structure has the advantages that: with the design of at least two S-shaped main flow channels connected in series and the diversion fin groups, a flow diversion function is provided, and at the same time, dissipation of the heat in the motor controller is effectively accelerated; with the design of S-shaped bosses, which are in seamless connection with the S-shaped main flow channels on the heat dissipation substrate, on the cover plate, closure of the motor controller is improved, and at the same time, liquid having the heat dissipation effect can flow orderly between the main flow channels and secondary flow channels, so as to achieve the purpose of liquid heat dissipation.

Provided in the present invention is a solid-state biological reaction device, comprising a main tank body and a collector, wherein a top air outlet, a bottom air inlet and a material entrance and exit are provided on the main tank body, wherein the collector is connected to the main tank body through the top air outlet. Also provided in the present invention is a method for preparing filamentous fungus spores utilizing the solid-state biological reaction device, comprising the steps of: feeding a culture substrate into the main tank body through the material entrance and exit, performing steam sterilization by injecting steam through the bottom air inlet, inoculating the filamentous fungus strains onto a sterile culture substrate in the main tank body for culturing so as to obtain mature filamentous fungus spores, and then passing dry air into the main tank body through the bottom air inlet, so that the filamentous fungus spores enter into the collector through the top air outlet. The solid-state biological reaction device of the present invention can achieve the mechanization and large-scale preparation of filamentous fungus spores.

The closure arrangement is applied to a metallic container comprising a peripheral side wall which presents an upper edge surrounding an opening, in which is fitted a lid having a peripheral upper wall externally provided with a circumferential rib to be fitted in an inner circumferential recess of the peripheral side wall; and a circumferential groove located inferiorly to the circumferential rib and housing a sealing ring to be internally seated against the peripheral side wall upon the fitting and axial retention of the circumferential rib in the circumferential recess.

The invention discloses a low-temperature sintering high-heat conduction ceramic paint suitable for metal base material and a preparation method and an application thereof. The paint comprises the following raw materials: low-temperature molten glass powder, iron oxide red, copper-chrome black, cerium dioxide, boron nitride, iolite micro powder, alumina micro powder, chromium sesquioxide micro powder, 20-50% of silicon aluminium sol, 0.5-3% of an auxiliary agent, and the balance of water. The method comprises the following steps: a metal matrix is processed, then the surface of the metal matrix is uniformly coated with a paint and dried in shade; and the coated metal matrix is heated at the temperature of 650-900 DEG C to form the low-temperature sintering high-heat conduction ceramic paint. The paint has the advantages of easy acquisition of the raw materials and low cost, is tightly combined with the metal matrix, has effective high temperature oxidation resistance, acid corrosion resistance and abrasion resisting effects of a heating furnace flue heat exchanger on a metal heat exchanger, ceramic coating surface is smooth and clean, slag buildup of the heat exchanger is effectively reduced, the service life of the metal heat exchanger is prolonged, and the heat exchange efficiency effect is increased.

The invention discloses a semi-active dynamic vibration absorber for magneto-rheological elastomers and a selection and installation method. According to the semi-active dynamic vibration absorber andthe selection and installation method, multiple layers of cross-shaped cross beams arranged in parallel are fixed to the positions below a bottom frame base located at the bottom of a railway vehiclein a suspended mode through four vertical magnetic conductive rods arranged vertically and penetrating through the four end parts of cross-shaped beam arms; multiple layers of stacked structures which are spaced from each other are formed between multiple layers of grooving vibrators and the cross-shaped cross beams; vertical mounting through holes are formed in the centers of the cross-shaped cross beams; the annular magneto-rheological elastomers are arranged between the mounting through holes and a connecting shaft of the multiple layers of grooving vibrators; the multiple layers of grooving vibrators can vibrate up and down relative to the bottom frame base in the axial direction of the mounting through holes; winding grooves are formed in the beam arms of the cross-shaped cross beams; and excitation coils are wound in the winding grooves. The semi-active dynamic vibration absorber has the advantages that the vibration absorption effect is good, the energy consumption is small, the structure is simple and compact, the installation is easy, the safety and the reliability are high, the utilization of the residual space under the railway vehicle is reasonable, and vertical wide-frequency vibration reduction can be carried out on a railway vehicle body which suffers form an abnormal vibration problem due to the fact that a railway is unsmooth.

The invention discloses an automatic fire extinguishing device suitable for a small power distribution cabinet. The device comprises a fixing box. A cylindrical barrel is fixedly mounted on the innertop wall of the fixed box. The bottom end of the cylindrical barrel is fixedly connected with a conical barrel. The bottom of the cylindrical barrel penetrates through the bottom wall of the fixed boxand extends to the outer side of the fixed box. A plurality of first storage boxes, a plurality of second storage boxes and a plurality of heat-resisting pipelines are symmetrically arranged on the inner side wall of the fixing box, each first storage box is provided with an opening mechanism and communicates with the corresponding heat-resisting pipeline through the opening mechanism, and an isolation mechanism is arranged in the cylindrical barrel. The fire extinguishing device is reasonable in structure, easy to install and suitable for small power distribution cabinets of various specifications. The device can automatically extinguish fire at the fire occurrence position at the initial stage of fire or in the smoldering state of an object, does not need manual monitoring, omits the process that managers discover the fire and find fire extinguishing device, and can remarkably reduce adverse effects caused by the fire.

The invention provides a gob sealing structure. The gob sealing structure comprises a first wall and a second wall which are arranged in a gob roadway; the space between the first wall and the second wall is not less than 2m, and the thicknesses of the first wall and the second wall are both not less than 0.6m; the inner wall of the gob roadway is provided with a roadway guniting layer formed through at least two guniting processes, and the total thickness of the roadway guniting layer is not less than 0.1m; the inner wall of the gob roadway is provided with a first annular-wall groove, the edge of the first wall is embedded into the first annular-wall groove, and the thickness of the first wall is adapted to the width of the first annular-wall groove; the inner wall of the gob roadway is provided with a second annular-wall groove, the edge of the second wall is embedded into the second annular-wall groove, and the thickness of the second wall is adapted to the width of the second annular-wall groove; and a grouting layer formed through a cement mortar grouting process is arranged between the first wall and the second wall. The gob sealing structure has higher sealing performance.

The invention discloses a big data O2O drawing reviewing cloud platform management system used for construction project construction drawing reviewing. A construction organization drawing paper upload module comprises a network server and a database server assembly. A construction unit data terminal is connected with the input end of the network server. The data output end of the network server is connected with the database server assembly. A firewall is connected on the port of the database server assembly through a switch I. The firewall is divided into three paths to be connected with a reviewing organization drawing reviewing management terminal, a storage unit and a CAD electronic signature authentication system. The whole course of paperless drawing reviewing of construction drawing reviewing can be realized, the drawing reviewing efficiency and the installation performance can be enhanced, and the cost can be greatly saved and the project period can be shortened.