37results about How to "Play a role in sealing" patented technology

The invention discloses a neodymium-iron-boron magnet of an aluminum or aluminum alloy composite coating and a preparation method thereof. An aluminum or aluminum alloy film is deposited on the neodymium-iron-boron magnet by adopting multi-arc ion plating technology, and then phosphate treatment is performed. The coating is uniform and dense, and is well combined with a matrix. The neodymium-iron-boron magnet applied with the aluminum composite coating with thickness of 10 to 20 microns tolerates high pressure and high humidity (100 to 130 DEG C, 2 to 2.6atm, and 95 to 100 percent RH) for over 200 hours, and tolerates NaCl salt fog corrosion (3.5 to 5 weight percent of NaCl and 25 to 35 DEG C) for over 500 hours. The coating process has high efficiency and low cost; and the prepared composite coating has good corrosion resistance and adhesion performance, and has no influence on the magnetism of the neodymium-iron-boron matrix (mainly small-size magnet).

The invention discloses a grouting and grouting-stopping anchor cable inside a hole. The grouting and grouting-stopping anchor cable comprises an anchor cable body, a cable anchor body, a tray, a grouting-stopping assembly inside a hole and a rigid core tube. The grouting-stopping assembly inside the hole comprises an inner sleeve, an outer sleeve, a tightening metal tube, an elastic sleeve and a hard sleeve. The hard sleeve, the elastic sleeve and the outer sleeve are connected in an end-to-end manner and sleeved on the cable anchor body in sequence. The lower end of the hard sleeve is fixed against the tray. The tightening metal tube, the inner and outer sleeves are arranged on the same position of the cable anchor body; the tightening metal tube is sleeved on the outer sleeve, and the inner sleeve is sleeved on the rigid core tube; and the inner and outer sleeves are hoses, tightened by the tightening metal tube, and plugged in inner and outer seams of a cable anchor body steel wire. The anchor cable can seal the hole at any drilling position, so that the hole is sealed firmly and the slurry can be prevented from leaking from the cracks around the hole, thus improving the grouting effects; the anchor cable has a simple structure and is convenient to install. The grouting and grouting-stopping anchor cable inside the hole not only can be used for a mineral hollow grouting anchor cable to seal a hole and stop grouting, but also can be used for a hollow threaded grouting anchor rod to seal a hole and stop grouting, and a common anchor cable/anchor rod to plug water.

The invention discloses a jet packer ground simulation method applicable to multilevel hydraulic jet fracturing. The method comprises the following steps: a, connecting in series jet packers of corresponding amount and other required tools on a construction test string according to the required designed level amount of an oil well and a gas well, placing a steel ball in an inlet of the construction test string, and connecting a high-pressure pipeline; b, gradually increasing the discharge capacity, if a sliding sleeve is hit off by the steel ball and pushed to pass through a central pipe of the packer continually and enter a sliding sleeve standing joint connected onto the lower part of the packer, and a water hole of a spray gun normally jets water, performing next-level test for the jet packer; c, if the sliding sleeve is not hit off by the steel ball, checking the mounting position of the sliding sleeve and the gap between the sliding sleeve and the spray gun, checking the position of a shear pin, and performing the test and detection in step b; and repeating steps a, b and c until completing all set tests. With adoption of the method, opening of all packers and jet tools, and jet of the spray gun can be observed.

The invention provides a preparation method of corrosion-resistant double coatings of an improved sintered Nd-Fe-B magnet. The preparation method comprises the steps of S1, conducting acid pickling, derusting and degreasing treatment, specifically, feeding the sintered Nd-Fe-B magnet into a nitric acid solution for acid pickling to remove rust and grease on the surface of the sintered Nd-Fe-B magnet; S2, conducting micro-arc oxidation treatment, specifically, feeding the sintered Nd-Fe-B magnet subjected to acid pickling into an electrolyte prepared from sodium aluminate, sodium hypophosphiteand deionized water for micro-arc oxidation treatment; S3, conducting spraying treatment, specifically, conducting spraying treatment on the sintered Nd-Fe-B magnet subjected to micro-arc oxidation treatment in the step S2 through a mixture comprising zinc oxide whiskers and polydimethyl siloxane; and S4, conducting natural drying, specifically, naturally drying the sintered Nd-Fe-B magnet subjected to spraying treatment in the step S3 in the environment and eventually forming a corrosion-resistant double-coating structure composed of the micro-arc oxidation ceramic coating and the zinc oxidewhisker/polydimethyl siloxane super-hydrophobic coating on the surface of the sintered Nd-Fe-B magnet.

The invention discloses a water sealing device applied to hydraulic fracture experiment under high-temperature and high-pressure condition. The water sealing device comprises a hole sealing nut, a metal water pipe, a locking nut, metal washers and wedge-shaped sealing red copper rings, wherein the wedge-shaped sealing red copper rings sleeve the metal water pipe which extends into drill hole inside a rock sample, are partitioned by the metal washers, and each wedge-shaped sealing red copper ring is formed by oppositely buckling two copper seals with slopes; the inner surface and the outer surface of each wedge-shaped sealing red copper ring are vertical surfaces; the wedge-shaped sealing red copper rings expand in a tester under the condition that the maximum temperature can reach 600 DEG C; the inner vertical surfaces and the outer vertical surfaces are used for pressing the metal water pipe and rock hole wall respectively, so that the initial hole sealing is implemented; the wedge-shaped sealing red copper rings are pressed and deformed to expand in the process of applying load to the rock sample by the tester; the outer vertical surfaces are on close contact with the hole wall of the rock sample; the inner vertical surface is in close contact with the metal water pipe, so that the high-pressure water sealing in the experiment process is implemented. According to the water sealing device, the wedge-shaped sealing red copper rings are additionally arranged outside the metal water pipe, so that the water sealing under the high-temperature, high-load and high-pressure condition is realized; the device is simple in structure, reliable in performance and high in stability, and is applied to the hydraulic fracture experiment of the rock under the high-temperature and high-pressure condition.

The invention discloses a hydrazine hydrate chemical nickel plating solution and a preparation method and nickel plating method of the hydrazine hydrate chemical nickel plating solution, and belongs to the technical field of chemical nickel plating. The problems that in the prior art, a sodium hypophosphite chemical nickel plating solution and the environment are damaged and polluted by the element phosphorus in the nickel plating solution, and the speed is low when hydrazine hydrate is adopted for chemical nickel plating are solved. The hydrazine hydrate chemical nickel plating solution is prepared from nickel sulfate, hydrazine hydrate, sodium citrate, potassium sodium tartrate, cobalt sulfate and lead acetate. The hydrazine hydrate chemical nickel plating solution and the preparation method and nickel plating method of the hydrazine hydrate chemical nickel plating solution are suitable for chemical nickel plating of matrix materials.

The invention discloses a high-airtightness tunnel kiln. The high-airtightness tunnel kiln comprises a kiln body composed of kiln walls and a kiln top, and a kiln car composed of a car frame, car wheels and a kiln car lining portion and operating on kiln rails. T-shaped grooves are formed in the side surfaces of the kiln car lining portion and formed along the full length of the kiln car. A plurality of packer bricks are movably inserted into the T-shaped grooves correspondingly and arranged in the length directions of the T-shaped grooves in sequence. Packer grooves are formed in the kiln walls correspondingly, and the external extending ends of the packer bricks are movably arranged in the packer grooves correspondingly. Skirt plates are arranged on the side surfaces of the car frame, sand sealing grooves containing kiln sand are formed in the kiln walls correspondingly, each skirt plate comprises a skirt plate body, the lower lateral side of each skirt plate body is connected with asand sealing inserting portion in a groove shape, the upper portion of each sand sealing inserting portion is connected with a skirt plate brick body, and the sand sealing inserting portions are inserted into the kiln sand. By adopting the high-airtightness tunnel kiln, good sealing isolation protection can be formed for the bottom of the tunnel kiln, heat is effectively prevented from being transmitted to the bottom of the tunnel kiln, and in addition, it can be guaranteed that the kiln car operates in the kiln walls without hindrance.

The invention provides a preparation method of a nonferrous alloy anti-corrosion layer. The preparation method comprises the following steps of raw material proportioning of a sol-gel solution, sol preparing, preparing of the sol-gel solution, film layer dipping and film layer drying. According to the method, sol-gel solution hole sealing is carried out on the porous microarc oxidization film, aneven film layer is obtained, surface clearances are reduced, binding force and smoothness are better, the coverage rate of a ceramic layer after nonferrous alloy oxidization is improved, the functionof hole sealing is achieved, the anti-friction function is also achieved, and the defects of surface needle holes, cracks and the like are overcome.

The invention discloses a drill rod hole sealing device for coal mine punching and relates to a sealing device. The sealing device is composed of a sealing part and a fixing part connected to the periphery of the sealing part, wherein the fixing part is fixedly connected with the periphery of a drill rod hole, the sealing part is made of an elastic material and is of a ripple structure provided with continuous crests and troughs, an annular sealing lip allowing a punching drill rod to penetrate through is arranged on the sealing part, the sealing surface of the sealing lip is matched with the peripheral surface of the punching drill rod, and a supporting frame is arranged inside the sealing lip. The sealing device is used for punching of a coal mine, can seal the drill rod hole and is good in sealing effect.

The invention discloses a protective agent for an electronic component pin tin coating. The protective agent comprises 100-200 g/L of a water-based acrylic resin, 30-50 g/L of silica sol, 5-15 g/L ofzinc gluconate, 5-15 g/L of dimethylethanolamine and 1-2 g/L of benzotriazole. The protective agent can improve the corrosion resistance of the electronic component pin tin coating and prevent oxidation discoloring of the pin tin plating layer of the electronic component pin tin coating.