84results about How to "Shrinkable" patented technology

The invention provides a technical method for producing isostatic pressure graphite, which comprises the following steps: using refinery coke or pitch coke as raw materials; crushing raw materials to 5 to 20 mum through airflows; then, carrying out treatment through work procedures such as primary mixing squeezing and sheet milling, extrusion forming, fast carbonization, crushing, sieving, secondary mixing squeezing and sheet milling, crushing, sieving, pre-forming, isostatic pressure forming, calcination, impregnating, graphitization and the like; and obtaining fine particle isostatic pressure isotropical graphite materials. Compared with traditional coarse particle graphite materials, the invention has the characteristics of fine and compact structure, good uniformity, excellent mechanical property, isotropy and the like, and is particularly suitable for the production of large-specification graphite products.

The invention discloses a preparation method for a multi-layer co-extrusion two-way stretched high-barrier plastic casing. The preparation method comprises the following steps of: respectively adding raw materials of each layer into an extruder for each layer for melting and plasticizing, wherein the multi-layer co-extrusion two-way stretched high-barrier plastic casing is formed by co-extruding five layers of raw materials; extruding the raw materials by a multi-layer stacked type round mold to form a multi-layer mold blank; slightly blowing and stretching the mold blank, and then immediately and rapidly cooling and molding the mold blank by using cooling water of 5-15 DEG C into a first pipe film; heating the first pipe film in a hot water tank or an infrared heating system to a proper temperature; aerating compressed air to ensure that the mold blank is transversely stretched for a multiplying power of 3 to 5 times and longitudinally stretched for a multiplying power of 2.5 to 3 times to form a second pipe film; putting the second pipe film in an infrared heating barrel for sizing; and rolling a finished product after cooling the second pipe film to a required fold diameter and shrinkage rate by using a vane. Plastic casings prepared by the preparation method have the characteristics of high barrier, high water retention and environmental protection.

The invention discloses a reduced shrinkage early strength polycarboxylic acid water reducing agent mother liquid and a preparation process thereof. The water reducing agent mother liquid is preparedby the free radical copolymerization reaction of a polyether macro-monomer, an anionic active monomer, a cationic active monomer, a shrinkage reducing monomer, a chain transfer agent and an initiator;wherein the polyether macro-monomer is isopentenyl polyoxyethylene ether and/or methyl allyl polyoxyethylene ether; the anionic active monomer is acrylic acid; the cationic active monomer is methacrylatoethyl trimethyl ammonium chloride; the shrinkage reducing monomer is an esterification reaction product of a phenyl alcohol or a methyl phenyl alcohol with acrylic acid; the chain transfer agent is 2-methyl-2-propene-1-sulfonic acid sodium salt; and the initiator comprises an initiator system A and an initiator system B, the initiator system A comprises organic hydrogen peroxide and vitamin C,and the initiator system B comprises sodium bisulfite and a ferrous salt. According to the preparation process, different functional monomers are grafted to the high-performance polycarboxylic acid water reducing agent, and the length of the main chain is adjusted, so that the polycarboxylic acid water reducing agent has excellent water reducing rate, and also has early strength and reduced shrinkage.

The invention discloses a wind prevention, sand fixation and water retention afforestation method and belongs to the technical field of environmental protection engineering. The method comprises steps as follows: a curing agent is prepared from sodium carboxymethylcellulose, anionic polyacrylamide, ferrous chloride and water; the curing agent and sand are blended to form cured sand; deep holes for tree planting and shallow trenches for grass planting are dug in the sand land, water collecting hoppers are drilled in the deep holes, the deep holes and the shallow trenches are filled with the cured sand, and the cured sand form deep hole sand fixation and water absorption layers in the deep holes and form shallow trench sand fixation and water absorption layers in the shallow trenches; saplings are planted in the deep holes, the roots of the saplings extend into the mouth parts of the water collecting hoppers, and grass seeds are scattered in the deep holes and the shallow trenches; the grass seeds are covered with a mulching film for maintenance, and small ventilation holes are formed in the mulching film. The curing agent and the sand soil are blended, inside gaps of soil particles can be filled with the blended curing agent and sand soil, the cured sand particles don't easily disperse and jump, sufficient water can be continuously provided for plants, and the long-time wind prevention, sand fixation and water retention effects are achieved.

The invention discloses a double-curved arch supporting structure used for underground engineering and a construction method and relates to the field of underground engineering. The double-curved arch supporting structure is located between surrounding rock and a hole body and comprises an arc-shaped arch and an inverted arch. The arc-shaped arch is matched with the hole body in annular radian, and the longitudinal surface of the arc-shaped arch is in a wave shape. Compared with an existing supporting material, the double-curved arch supporting structure and a flat plate unit supporting structure use materials with the same quality, machined members have the same length. The bending resistance ability of double-curved arch units can reach certain ten times as large as that of flat plate units. The double-curved arch structure adopts factory prefabricating, so that the supporting operation time of constructors in underground space is shortened. Further, wave-shaped grooves in the outer surface of an arc-shaped arch serve as drainage channels, so that water outlet holes do not need to be constructed, construction difficulty of the underground space is reduced, and the safety assurance of operators is improved while the construction time is shortened.

An integrated alignment and overlay mark includes a pre-layer pattern for reticle-to-wafer registration implemented in an exposure tool, and a current-layer pattern incorporated with the pre-layer pattern. The pre-layer pattern and the current-layer pattern constitute an overlay mark for determining registration accuracy between two patterned layers on a semiconductor wafer.

The invention discloses a snow accumulation preventive antislip floor tile which comprises a floor tile. The floor tile is transversely arranged on a foundation, a plurality of mounting holes which are perforated are equidistantly formed in the side walls of the floor tile, fixing lantern rings are transversely arranged in the mounting holes, movable contacts are slidably connected into the fixinglantern rings, slide plates are transversely arranged in the mounting holes, slide grooves which are matched with the slide plates are symmetrically formed in the inner walls of the mounting holes, conductive springs which are matched with the movable contacts sleeve the side walls of the outer sides of the movable contacts, one end of each conductive spring is fixedly connected with the side walls of the corresponding fixing lantern ring, the inner wall of the other end of each conductive spring is fixedly connected with the side walls of the outer side of the corresponding movable contact,the side walls of the lower sides of the movable contacts are fixedly connected with the side walls of the slide plates, and the movable contacts are of hollow structures. The snow accumulation preventive antislip floor tile has the advantages that snow can be effectively prevented from being accumulated on the surfaces of the snow accumulation preventive antislip floor tile, and people can be effectively prevented from slipping when walking.

The present invention discloses an advanced pier column pre-arranging gob-side entry retaining method, which comprises: arranging pier columns on the middle portion of a roadway according to row spacing after digging the roadway so as to make both sides of the pier column respectively design the cross-section sizes for the current work surface mining roadway and the next work surface mining roadway; along with the mining performing of the current work surface, retaining the next work surface mining roadway by using the pier columns as the roadway side support bodies; and during the next work surface mining performing process, recovering the pier columns on the rear of the work surface in a one-by-one manner. According to the present invention, the pier columns pre-arranged in the advanced manner are utilized to provide the active cutting-supporting control effect for the gob-side entry retaining top plate, such that the gob-side entry retaining success is ensured while the advantages of roadway side support body construction work safety, no limitation of the roadway side support body construction on the current work surface mining speed, pier column recovering, low cost of the gob-side entry retaining, and the like are provided, and the method is suitable for coal mine mining.

The invention discloses a preparation method of a curing agent applicable to sandy soil, and belongs to the technical field of environmental protection engineering. The preparation method is characterized by comprising the following steps that 1, sodium carboxy methylcellulose and water are subjected to stirring and dissolving according to the mass ratio of 1:20, and a sodium carboxy methylcellulose solution is obtained; 2, anionic polyacrylamide and water are subjected to stirring and dissolving according to the mass ratio of 1:100, and an anionic polyacrylamide solution is obtained; 3, ferrous chloride and water are subjected to stirring and dissolving according to the mass ratio of 1:50, and a ferrous chloride solution is obtained; 4, under the room temperature condition, the sodium carboxy methylcellulose solution, the anionic polyacrylamide solution and the ferrous chloride solution are sequentially added into water for mixing and prepared into the curing agent. The curing agent has the advantage of being high in adsorption and cementation, inner pores of soil particles can be filled with the curing agent mixed with the sandy soil, the mixture serves as natural cement of the soil, the cured sand particles are not prone to disperse, and the sand fixation and anti-wind capability are high.

The invention discloses a titanium-gypsum-based material for filling a goaf and a preparation method thereof. The titanium-gypsum-based material for filling the goaf is prepared by the steps that titanium gypsum after calcination and aging is taken as a main raw material, a small amount of portland cement, desulfurized gypsum, fly ash and other components are added, and the preparation is completed through mixing, molding and demoulding. According to the titanium-gypsum-based material and the preparation method thereof, a solid waste material is fully utilized, the use cost of fillers is reduced, the material is good in fluidity and workability, construction is convenient, and the final setting time is shortened relative to a cement-based material, so that the filling time is reduced.

The invention discloses a clamping device, and particularly relates to a clamper clamping an internal part of a workpiece. The clamper clamping the internal part of the workpiece comprises a base seat and a positioning device arranged on the base seat, the positioning device comprises a clamping piece and a fixing piece, wherein the clamping piece is of a barrel-shaped structure, and the lower portion of the fixing piece is in threaded connection with the base seat. A cross through groove is arranged in the clamping piece. Compared with the prior art, the clamper clamping the internal part of the workpiece solves the problem that discarded clampers are inconvenient to replace in the prior art, and adopts a spilt structure design. The clamper clamping the internal part of the workpiece can be replaced conveniently due to the fact that the clamper body is in threaded connection with the base body, and at the same time different clamping pieces can be adopted according to different structures of the clamping pieces. Due to the fact that the clamping piece adopts the barrel-shaped structure and the cross through groove is arranged in the clamping piece, the clamper clamping the internal part of the workpiece achieves clamping of the workpiece by sleeving the clamping piece into the workpiece.

The invention discloses a laboratory multifunctional pipette bracket, which comprises a base and a cleaning device, wherein the bottom surface of the cleaning device is connected with the upper surface of the base, a clamping plate is arranged on the cleaning device and rotationally connected with the cleaning device, the upper surface of the cleaning device is connected with a protection cover, and the bottom surface of the protection cover is connected with the upper surface of the cleaning device. According to the invention, the clamping plate can clamp a pipette with any finger hook radian, and a user can rotate the clamping plate according to actual requirements, so that the pipette can be conveniently taken by himself/herself; the cleaning device automatically cleans the surface and the interior of the pipette, so that the pipette is comprehensively and thoroughly cleaned automatically; and after cleaning is finished, the protection cover is opened to conduct dustproof protection on the pipette, disinfectant staying on the inner wall of the protection cover and the cleaning device in the cleaning process can be volatilized, limitation of the radian of a finger hook of the pipette is avoided, the whole structuthee is simple, and the laboratory multifunctional pipette bracket has the multiple functions of clamping placement, automatic cleaning, dust prevention and disinfectant volatilization facilitating, and has wide popularization significance.

The invention discloses a movable exhaust pipe material frame system. The movable exhaust pipe material frame system comprises an inclined slope surface, wherein the inclined slope surface is supported by a bracket; universal wheels are arranged at the bottom of the bracket; a conveying belt is arranged on the inclined slope surface; a plurality of clamps used for fixing exhaust pipes are arrangedon the conveying belt; the conveying belt is driven by a reducing motor; a pneumatic lifting device for lifting the exhaust pipes is arranged on a higher side of the inclined slope surface; a row ofround rollers which are arranged closely are arranged in the conveying belt; one of the round rollers is a connecting shaft roller, and is connected with an output shaft of the reducing motor througha roller chain coupling; and the roller chain coupling is connected with the output shaft of the reducing motor and the connecting shaft roller through a key I and a key II respectively. The movable exhaust pipe material frame system disclosed by the invention is high in working efficiency, greatly reduces the workload of workers, is reasonable in design, relatively simple in structure, low in cost and great in use convenience, and has a great application prospect.

The invention discloses an intracranial dense mesh stent and a preparation method thereof, and belongs to the technical field of medical instruments, the intracranial dense mesh stent comprises a dense mesh stent body formed by weaving a plurality of nickel-titanium alloy wires in a crossed mode, the surface of the dense mesh stent body is smooth, the dense mesh stent body is provided with diamond-shaped mesh holes, a plurality of fixing strips are arranged in the dense mesh stent body in a crossed mode, and the fixing strips are arranged in the dense mesh stent body. The diameter of the dense net stent after expansion is 4-7 mm, and the upper end and the lower end of the dense net stent are each wound with a layer of expandable protective ring. According to the intracranial dense net stent and the preparation method thereof, the artery blocking effect is effectively improved, aneurysm is gradually reduced, and then the healing purpose is achieved; the protection rings at the upper end and the lower end of the dense net stent prevent the ends of the nickel-titanium alloy wires from damaging the artery, and meanwhile the situation that after the dense net stent is expanded, the ends of the nickel-titanium alloy wires move, and consequently the dense net stent deforms is avoided.

The invention discloses a skin removal method of chicken feet. The method comprises the following steps of preparation: using a skinner for the chicken feet; cleaning: cleaning the chicken feet with fresh water for 3 to 5min; heating: soaking the chicken feet into high-temperature fresh water; sleeving: enabling five rings to sleeve five toes separately; positioning: embedding a positioning blade into the outer skin of the toes; starting: starting motors positioned between adjacent toes, and ensuring that the motors drive bulges on a rotating shaft to be in friction with the outer skin of the adjacent toes; skin removal: ensuring that the motors move in the direction from the heel to the tiptoe of a toe, so as to accomplish the removal of the skin of the adjacent toes. Through adoption of the scheme, the problem that the labor intensity is high when the skin of the adjacent toes of the chicken feet is manually removed is solved.

The invention discloses a sandy soil greening construction method, and belongs to the environment protection engineering technical field; the method comprises the following steps: preparing a curing agent; mixing the curing agent with sandy soil so as to form curing sand; digging deep pits and shallow trenches in the sandy soil, drilling water funnels into the deep pits, filling the curing sand into the deep pits and shallow trenches, planting saplings into the deep pits, allowing sapling roots to extend to the water funnel mouths, and spreading grass seeds in the deep pits and shallow trenches; laying fine sands on the grass seeds, using a mulch film to cover the grass seeds, opening vents on the mulch film, inserting wooden slots around the mulch film, and pouring slurry into the slots so as to form a water fence; watering the grass seeds for maintenance, and irrigating in every 1-2 days until the grass seeds germinate. The method mixes the curing agent with the sandy soil so as to fill inner gaps of the soil particles; the curing sand particles cannot easily disperse and jump, thus contentiously providing sufficient water for plants, and realizing long term windproof, sand solidification, water retention and greening effects.

A disclosed biogas pool convenient for slag discharging comprises a fermentation pool, a material inlet pipe and a material outlet pipe; a top cover is arranged on and fixedly connected with the fermentation pool; the top of the top cover is provided with a gas outlet; the bottom of the fermentation pool inclines towards one side; the material inlet pipe extends to the central part of the fermentation pool from ground; and the material outlet pipe extends to a low-lying position at the bottom of the fermentation pool. Compared with conventional biogas pools, the biogas pool provided by the invention is short in construction period, low in cost and high in biogas production rate, and also has shrinkage property for improving safety; and due to the fact that the bottom of the fermentation pool inclines towards one side, wastes deposited at the bottom of the fermentation pool automatically accumulate at the low-lying position and are discharged by the material outlet pipe, the cleaning of the wastes are facilitated.

The invention relates to the technical field of shoe racks, in particular to a multifunctional shoe rack. The multifunctional shoe rack is characterized in that side boards and a rear board are arranged on a base, supporting boards are connected between the side boards, a stop board is arranged on the other sides of the supporting boards to form a dust collecting cavity, vertical columns are arranged above the dust collecting cavity and connected to an oblique board, the supporting board above the oblique board is provided with inclined air spray heads and a mounting cavity, the inclined air spray heads are connected to an air pipe which is connected to a hose, the hose is connected to an air pump, a roller is mounted in the mounting cavity and sleeves one end of a sleeve rod, the other end of the sleeve rod is connected in a threaded cavity positioned in a mounting rod, a transverse rod is arranged below the mounting rod, connecting rods are arranged at two ends of the transverse rod,springs are arranged on the connecting rods, a rubber rod is arranged below the corresponding connecting rod, and a hollow ball is arranged at the lower end of each rubber rod, provided with ventilation holes and filled with deodorants. The multifunctional shoe rack is capable of cleaning shoe surfaces and deodorizing shoes.

The invention provides a rigid ureteroscope/flexible ureteroscope teaching mold which comprises a urinary system model; artificial urine can be injected into the urinary system model to simulate the urine internal environment of a urinary system; the urinary system model comprises a kidney model, a bladder model, a ureter module, a calculus model, a urethra model and a fixing device; the kidney model is provided with a water injection port; and the kidney model, the bladder model, the ureter model and the urethra model are made of rubber materials. The invention further provides preparation and operation methods of the rigid ureteroscope/flexible ureteroscope teaching mold. According to the rigid ureteroscope/flexible ureteroscope teaching mold and the preparation and operation methods thereof, the defects that a urinary system teaching mold used for operation of a traditional rigid ureteroscope/flexible ureteroscope is low in simulation performance, single in stone lesion characteristic and poor in operability are overcome.

The invention discloses door and window frame joint filling waterproof mortar with a strong hydrophobic micro-elastic function. The material comprises a powder material and polyphenyl granules, wherein the ratio of the powder to the polyphenyl granules is (300-400) kg: 1.1 m3; the powder material comprises the following components in percentage by mass: 0.1%-0.5% of hydroxypropyl methyl cellulose,0.1%-0.5% of starch ether, 0.2%-1% of a water repellent agent, 0.1%-0.5% of redispersible latex powder, 0.1%-0.5% of polypropylene fiber, 0.1%-0.5% of wood fiber and 80%-99% of cement. The mortar isprepared from hydroxypropyl methyl cellulose, starch ether, a water repellent agent, redispersible latex powder, polypropylene fibers, wood fibers and cement. By means of the waterproof mortar, the hydrophobicity of the surface of the mortar is improved, the water absorption rate of surface mortar is reduced, and the strength, crack resistance and hydrophobicity of the mortar are guaranteed; and by mixing the polyphenyl granules, the mortar has contractibility, thereby enhancing the moisture resistance and impermeability of the mortar.

The invention discloses an adjustable electric drill tool and a drilling technology, and belongs to the field of building engineering construction.The adjustable electric drill tool comprises a frame body and drilling equipment, the frame body comprises a main rod, an auxiliary rod, a supporting rod and a connecting rod, the auxiliary rod and the supporting rod are movably connected with the main rod, and the connecting rod is connected with the auxiliary rod and the supporting rod; enough stability is guaranteed through multiple connecting and fixing modes, the drilling equipment is installed at the top of the auxiliary rod, a storage groove is formed in the end, away from the auxiliary rod, of the main rod, a telescopic rod is placed in the storage groove, one end of the telescopic rod is fixed into the storage groove, and the other end of the telescopic rod is fixedly connected with a handle. The telescopic rod is matched with the handle to expand the height adjustable range. The tool is simple in structure, the handle is driven through the telescopic rod, the upper limit of height adjustment is increased, and the stability of the tool is ensured through cooperation of multiple connection modes.