48results about How to "Many contact surfaces" patented technology

The invention discloses a locating device for an annular workpiece. The locating device comprises a bottom disk; three sliding grooves I uniformly distributed with respect to a circle center of the bottom disk are formed in the bottom disk; clamping blocks I connected in a sliding manner are arranged in the sliding grooves I; three fixing seats are further arranged on the bottom disk; rotating rods are arranged on the fixing seats; pressure rods I are arranged at the upper ends of the clamping blocks I; pressure heads I are arranged at the lower ends of the pressure rods I; supporting faces Iare arranged below the pressure heads I; a disk body is arranged in the center of the bottom disk; sliding grooves II are formed in the upper end of the disk body; clamping blocks II are arranged in the sliding grooves II; pressure rods II are arranged at the upper ends of the clamping blocks II; pressure heads II are arranged at the bottoms of the pressure rods II; outer tapered bulges are arranged on the outer sides of the clamping blocks II; inner tapered bulges are arranged on the inner sides of the clamping blocks II; supporting faces II are arranged on the bottom faces of the inner sidesof the clamping blocks II; plane thread teeth are formed at the bottoms of the clamping blocks II; the interior of the disk body is connected with a disk wire in a sleeved manner; and four bevel gears are arranged in the disk body. The locating device is wide in part clamping scope, errors due to edge deflection of a part with the relatively large diameter can be eliminated effectively, the machining on all the positions of the part can be achieved, and the locating device has the very good generalization property.

The invention discloses a multidirectional clamping device for a shaft. The multidirectional clamping device comprises a fixing mechanism, a driving mechanism and a hold-down mechanism; the fixing mechanism comprises a base, a lug boss for holding a shaft, and a supporting seat arranged on the base; a transverse through hole is formed in the base and a guide hole is formed in the supporting seat; the driving mechanism comprises a cylinder and a push plate, the two of which are fixedly connected; a clamping arm going though the guide hole and a push rod going through the through hole are arranged in the push plate; the hold-down mechanism comprises a clamping jaw for clamping the shaft, and a connecting plate hinged to the push rod and the clamping jaw; the turning point of the clamping jaw is hinged to the base. The multidirectional clamping device for the shaft is mainly used for solving the problems of complex mold structure, complex operations and low working efficiency in the shaft manufacturing process at present.

The invention provides a preparation method of a bifunctional sulfur-doped cobalt oxide and sulfur, nitrogen and oxygen doped carbon in-situ composite electrode. Electro-deposition and air atmosphereannealing are used to prepare a sheet-like cobalt oxide array in-situ electrode. A forehead fluid containing thiourea and triton is loaded onto the surface of the cobalt oxide array in-situ electrode,dried and then annealed under a protective atmosphere. The product obtained by the technical scheme of the present invention has an excellent dual-function catalytic function of oxygen evolution reaction and oxygen reduction reaction, and owning a variety of high electro-catalytic active sites, including sulfur, nitrogen, oxygen doped active sites in carbon materials, other consequent lattice defects, a strong coupling interface between carbon materials and cobalt oxide, defect sides caused by sulfur-doped cobalt oxide, etc. are constructed. The excellent dual-function electrocatalyst has potential for application to fuel cells and zinc-air batteries.

The invention discloses a preparation method of a three-dimensional network-shaped tungsten carbide-carbon nanotube composite material. The preparation method comprises the steps of dissolving a tungsten source in a solvent in a microwave tube, placing the microwave tube in a microwave synthesis device after uniform stirring, and performing reaction for 40-60 minutes under 160-180 DEG C to obtain W18O49 with oxygen defect; and placing the W18O49 in a tubular furnace, performing carbonization at 700-900 DEG C under the atmosphere of a carbon source, and cooling the product to a room temperature under the atmosphere of nitrogen protection to obtain WC-CNTs particles. The preparation method is simple and practical to operate, a tungsten oxide with oxygen defect is used as a precursor, atomic diffusion is facilitated, and the carburization process is facilitated; and meanwhile, a carbon nanotube is grown on a tungsten substrate in an in-situ manner to form a complicated three-dimensional network structure taking WC small particles as branch points and a carbon tube as a framework, the WC particles can be effectively diffused, more contact surface between WC and pt is ensured, the conductivity of the composite material is integrally improved, the joint effect of the three parts is developed better, and an electrocatalytic effect is improved.

The invention provides a manufacturing method of a bifunctional copper, cobalt nitride and carbon in-situ composite electrode. An acicular cobalt oxide, copper oxide array in-situ electrode is manufactured by electrodeposition and air atmosphere annealing, and a dicyandiamide and a precursor fluid of triton or polyaniline is loaded onto the surface of a cobaltous oxide and copper oxide arrayin-situ electrode, and after drying, an annealing reaction is performed under a protective atmosphere. A product constructs a plurality of high electrocatalytic active sites, including nitrogen-doping active sites in a carbon material and other lattice defects caused thereby, and carbon material and copper, and cobalt nitride strong coupling interfaces. The composite electrode has excellent electrocatalytic oxygen evolution reaction and oxygen reduction reaction, and the excellent bifunctional electrocatalyst has a prospect for use in fuel cells and zinc-air batteries.

The invention belongs to the technical field of wind power generation, and relates to a fan blade manufactured by using a fan blade frame. The frame comprises supporting rods and a beam, and a middleshaft of the frame is provided with a through hole, wherein the supporting rod is in a waney arc structure, a rotation shaft connecting end of the arc structure is connected to the middle part of thebeam, and the outer diameter and the wall thickness of each supporting rod are gradually reduced. The beam is a U-shaped arc, and the end face of a rotation shaft connecting end of each supporting rodis provided with a plurality of connection holes which are fixedly connected with a plurality of rotation shafts. The upper parts and the lower parts of the supporting rods of the frame are twisted to form a twisted frame. The invention has the advantages of more contact surfaces with natural wind, high wind energy utilization rate, good stability due to the double-rod connection with the rotation shafts, length reduction compared with other fan blades with the same power and great cost reduction. The fan blade frame is of a detachable type and can be transported detachably when required to be transported, thus the fan blade frame is convenient to transport.

The invention discloses an effective integrated wastewater treatment process and device and belongs to the technical field of environment engineering. By adopting the effective integrated wastewater treatment device, after the sewage flowing into the integrated treatment device, the sewage is processed by anoxic-anaerobic-aerobic-secondary anoxic-secondary aerobic biochemical reaction zones, and the processing effect of intensifying the ammonia nitrogen and phosphorous can be reached. The rural domestic wastewater is processed by the effective integrated wastewater treatment device, and the emission standard reaches the primary B standard. The integrated device is one-time shaped, is compact in structure, high in integration degree and convenient in operation management and is suitable for the dispersed and centralized treatment of the rural domestic wastewater.

The invention provides a method for preparing a bifunctional cobalt, nitrogen and oxygen doped carbon in-situ composite electrode. Electro-deposition and air atmosphere annealing are used to prepare asheet-like cobalt oxide array in-situ electrode. A forehead fluid containing dicyandiamide and triton is loaded onto the surface of the cobalt array in-situ electrode, dried and then annealed under aprotective atmosphere. The triton is gradually dehydrogenated, deoxidized and partially graphitized to form a carbon material under the protective atmosphere, and since the triton contains a large amount of oxygen, a large amount of oxygen is incorporated into the carbon materials in the form of an ether group, a carbonyl group or a carboxyl group. The ammonia gas generated by the decomposition of dicyandiamide causes the carbon material to be doped with nitrogen while reducing the cobalt oxide to cobalt particles. The product of the invention constructs a plurality of high electrocatalytic active sites, including nitrogen and oxygen doped active sites in the carbon materials, other lattice defects caused thereby, strong coupling interfaces of carbon materials and cobalt, etc., so that oxygen evolution reaction and oxygen reduction reaction through electro-catalysis is realized. The dual-function electrocatalyst has prospects of application in fuel cells and zinc-air batteries.

The invention provides a GaN-based LED and a method for manufacturing the GaN-based LED. The method for manufacturing the GaN-based LED comprises the following steps: (a) an n-type GaN, a multi-quantum well and a p-type GaN are successively formed on a substrate; (b) a transparent conductive layer is formed on the p-type GaN; (c) mesa etching is performed on one part of the transparent conductive layer, the p-type GaN and the multi-quantum well until one part of the n-type GaN is exposed; (d) an oxide protective layer is formed on the transparent conductive layer and the exposed part of the n-type GaN; (e) the oxide protective layer is etched on a position with no mesa etching so that one part of the transparent conductive layer is exposed, and the oxide protective layer is etched on the position with mesa etching so that one part of the n-type GaN is exposed; (g) and a p electrode and an n electrode are formed on a rough surface and the part that n-type GaN is exposed respectively. The probability and the degree of losing an electrode can be reduced by using the GaN-based LED.

The invention discloses a ventilated heat-dissipating barn comprising a barn body, a cover and a barn bottom. A vent tube passing through the barn bottom and the cover is disposed in the barn body. The section of the vent tube is round or square. The side wall of the vent tube is provided with vent holes. The top of the vent tube is provided with a vent tube cap. The vent tube comprises two branch vertical tubes and a master tube. The branch vertical tubes are disposed side by side, while the bottoms of the branch vertical tubes pass through the barn bottom and the tops of the branch vertical tubes are communicated. The bottom of the master tube is communicated with the branch vertical tubes, and the top of the master tube passes through the cover. The vent tube in the barn body comprises the branch vertical tubes and the master tube, the branch vertical tubes are disposed side by side, area of contact with grains in the barn body is increased, and heat and moisture generated by the grains in the barn body can by discharged faster; an exhaust fan is mounted at the barn bottom, the air outlet side of the exhaust fan is close to the communicated positions of the branch vertical tubes with the barn bottom, air ventilation in the barn body can be more enhanced by switching on the exhaust fan to ventilate, and the ventilated heat-dissipating barn is better in ventilation and heat dissipation.

The invention provides a fabricated inorganic mineral plate leveling and mounting structure. The fabricated inorganic mineral plate leveling and mounting structure comprises a plurality of main keels,auxiliary keels, a floor body and edge closing strips. The main keels are fixedly connected to a ground base layer and arranged in parallel, and the auxiliary keels are perpendicular to the main keels and located between every two adjacent main keels. Bosses are arranged at the two ends of the auxiliary keels, clamped into the first clamping grooves in the side walls of the main keels, and fixedly connected with the bottoms of the first clamping grooves through corner connectors. The main keels and the auxiliary keels are arranged in a staggered mode to form a latticed base layer framework, so that the floor has more contact faces to serve as supports, the stability of the mounting structure is improved, the bearing capacity is high, and stable mounting of inorganic mineral plates with the thickness of 30 mm or above is guaranteed. Through the modular main and auxiliary keel design, mounting grooves suitable for the floor specification can be rapidly built, the construction process issimple, and the mounting efficiency is greatly improved.

The invention belongs to the technical field of civil engineering construction and relates to an anti-sliding device for a large-gradient shield tunneling machine. The anti-sliding device comprises afixing block, a tensioning mechanism, a swing arm mechanism and an anti-sliding damping block; the anti-sliding damping block and the fixing block are connected through the swing arm mechanism; the two ends of the swing arm mechanism are hinged to the anti-sliding damping block and the fixing block correspondingly, thus a hinge structure is constituted by the fixing block, the swing arm mechanismand the anti-sliding damping block; the fixing end of the tensioning mechanism is connected with the fixing block, the tensioning movable end of the tensioning mechanism is connected with the swing arm mechanism, and the tensioning movable end pushes the swing arm mechanism to rotate and then drives the anti-sliding damping block to move; the swing arm mechanism comprises a first swing arm and a second swing arm which are parallel mutually; and the two ends of the first swing arm and the two ends of the second swing arm are hinged to the anti-sliding damping block and the fixing block throughrotating shafts correspondingly, and a quadrilateral hinge structure is constituted by the fixing block, the first swing arm, the second swing arm and the anti-sliding damping block. The structure issimple, the shield tunneling machine can be prevented from sliding downwards, and tunneling of the shield tunneling machine is stable and safe.

The present invention discloses a four-line angle iron cross arm. The four-line angle iron cross arm comprises a four-line angle iron cross arm body. The four-line angle iron cross arm body comprises a horizontal plate and an upright plate. Mounting holes for mounting porcelain pots are formed in the upright plate. The four-line angle iron cross arm is characterized in that two triangular iron plates are fixedly mounted on the horizontal plate; and the triangular iron plates are symmetrically distributed on the horizontal plate. The length of the triangular iron plates is equal to the width of the horizontal plate. When the four-line angle iron cross arm of the invention is used, the two triangular iron plates symmetrically distributed on the horizontal plate contact with a pole, so that the four-line angle iron cross arm can be more stable; and the length of the triangular iron plates is equal to the width of the horizontal plate, so that the contact surfaces of the triangular iron plates and the pole can be larger, and therefore, the four-line angle iron cross arm can be mounted on the pole more stably.

The invention relates to the technical field of heat exchangers, and provides a displacement heat exchanger which comprises a tank body, a first heating mechanism and a second heating mechanism, wherein the tank body is provided with a first cavity and a first outlet; the first heating mechanism and the second heating mechanism are of the same structure, are evenly arranged in the circumferential tangential direction of the tank body and are each provided with a second cavity; the second cavities and the first cavity are communicated and each comprise a main body arranged on the tank body; a blocking piece is arranged in the first cavity; a heating coil is arranged in each second cavity, abuts against the blocking piece and provided with a second inlet and a second outlet; a first baffle plate is arranged at an inlet of each second cavity through a fastener and provided with a first inlet; and each second inlet and each second outlet penetrate through each first baffle plate. By means of the technical scheme, the problem that in the prior art, the temperature of flue gas is kept stable before the flue gas enters a selective catalytic reduction (SCR) reactor is solved.