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

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 relates to a yarn drum suitable for fuzzing, pilling and stable grinding of yarns as well as a preparation and a use thereof. The surface of a metal barrel of the yarn drum is coated and bonded with a high polymer film with the thickness of 0.5-3 mm and rough outer surface so as to keep the stability of winding yarns wound on an outer layer and especially guarantee that the winding yarns are stable, move less and even nearly do not move in a yarn grinding process. Due to the existence of the film, the ground winding yarns can be stably pressed in the film and held by the rough surface of the film, the yarns are guaranteed to be not turned or moved in the yarn grinding process, and the fuzzing and pilling results of the yarns are stable. The yarn drum comprises a yarn drum shaft, the metal barrel, the high polymer film, two side embedded grooves and left and right yarn head nails, is a key part of a yarn fuzzing and pilling measurement device, and can be used for yarn grinding sample preparation and measurement of yarn fuzzing and pilling.

The invention discloses a guarding device for building construction used for a fence of a building construction site. The guarding device comprises a device main body which is of a boot-shaped structure and with the hollow interior. A first water inlet and a first water outlet are formed in the two sides of the length direction of the lower part of the device main body, wherein the first water inlet and the first water outlet communicate with the interior of the device main body. The first water inlet and the first water outlet are in detachable and inserted connection with first pipe plugs. The side of the width direction of the device main body is a flat side, and the upper part of the flat side is rotationally provided with a connecting plate. One end of the connecting plate is rotationally connected with the edge of the horizontal direction of the flat side of the device main body. The other end of the connecting plate is provided with a pair of opposite connecting holes. The otherside, adapted to the arranged height of the connecting plate, of the flat side is provided with a connecting column, wherein the size of the connecting column is adapted to the size of the connectingholes. After a plurality of device main bodies are arranged in rows, the connecting holes of each connecting plate can be in inserted and connected fit with the corresponding connecting column of theadjacent device main body by overturning the corresponding connecting plate, so that the device main bodies are connected and fixed to one another side by side.

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 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 method for preparing a double-functional in-situ composite electrode of copper, cobalt nitride and carbon. Electrodeposition and air atmosphere annealing are used to prepare needle-shaped cobalt oxide and copper oxide array in-situ electrodes. The common precursor solution or polyaniline is loaded onto the surface of the needle-like cobalt oxide and copper oxide array in-situ electrodes, and annealed in a protective atmosphere after drying. The product of the present invention has built a variety of high electrocatalytic active sites, including nitrogen-doped active sites in carbon materials and other lattice defects caused by them, strong coupling interfaces between carbon materials and copper, and cobalt nitride, etc., so that It has excellent electrocatalytic oxygen evolution reaction and oxygen reduction reaction, and this bifunctional electrocatalyst with excellent performance has the prospect of being used in fuel cells and zinc-air batteries.