49results about How to "Avoid crack failure" patented technology

Apparatus and methods are disclosed for applying electromagnetic force (EMF) to flanging and hemming metal panels to form a hemmed panel assembly. First and second apparatus and method steps use a translating EMF coil to flange a sheet and to finish a hem by progressive non-planar bending. An alternate embodiment uses EMF hemming for difficult-to-hem portions of a flange and optionally precedes this with conventional hemming of straight hem portions.

The invention discloses a pressure relief type explosion-proof tank, which comprises a tank body and a tank bottom, wherein a cover plate with cover plate pressure relief holes is arranged on the top of the tank body; the tank body consists of an inner cylinder and an outer cylinder; the outer cylinder consists of an outer cylinder wall and an outer cylinder buffer layer arranged in the outer cylinder wall; the tank bottom is provided with an outer cylinder wall bottom plate; a buffering base plate is arranged on the upper part of the outer cylinder wall bottom plate, on the inner side of the outer cylinder buffer layer and on the lower part of the inner cylinder; outer cylinder wall pressure relief holes are formed on the outer cylinder wall bottom plate; the inner cylinder consists of an inner cylinder wall and an inner cylinder buffer layer in the inner cylinder wall; a buffering lining plate is arranged on the lower part of the cover plate and on an inner side of the inner cylinder buffer layer; the buffering lining plate and the buffering base plate are made of porous foam metals; the inner cylinder buffer layer and the outer cylinder buffer layer are made of closed pore foam metals; and the thickness of the buffering base plate is greater than that of the buffering lining plate. By the explosion-proof tank, fragments produced through explosion can be prevented from flying out of the tank so as not to damage surrounding equipment and crowd, the internal pressure of the tank body can be reduced through pressure relief, and the safety performance of the explosion-proof tank is improved.

The invention discloses a gradient sandwiched anti-explosion pot, comprising a pot body and a pot bottom, wherein the pot body is composed of an inner barrel, an inner buffer layer, a middle buffer layer, an outer buffer layer and an outer barrel; the inner buffer layer, the middle buffer layer and the outer buffer layer are made of closed cell foam metals and the density of the closed cell foam metal from the inner buffer layer, the middle buffer layer to the outer buffer layer is reduced gradually; a cover plate with a pressure relief hole is formed at the top of the pot body; the pot bottom is a bottom plate of the outer barrel; buffer base plates are installed on the upper part of the bottom plate of the outer barrel and the inner part of the inner barrel; a pressure relief hole is formed on the bottom plate of the outer barrel; buffer lining plates are installed at the lower part of the cover plate and the inner part of the inner barrel; the buffer lining plate and the buffer base plates are made of opening-hole foam metals; the thickness of the buffer base plate is more than that of the buffer lining plate; the thickness of the outer barrel is more than that of the inner barrel; the multilayer foam metal of which the density is reduced gradually from inside to outside is used as a sandwiched layer to improve the anti-explosion performance of the anti-explosion pot.

The invention provides a hafnium silicate environment barrier coating for a ceramic-based composite material matrix and a preparation method thereof. The preparation method comprises the following steps: (1) mixing HfO2 and SiO2, carrying out wet mixing and ball milling on a ball mill, drying, grinding, sieving, sintering, and carrying out a high-temperature solid-phase reaction; (2) after the high-temperature solid-phase reaction is finished, adding deionized water for slurry preparation, then performing ball milling, and performing spray granulation to obtain an HfSiO4 powder material; (3) firstly spraying a Si layer on the surface of a ceramic-based composite matrix as a priming coat, and then spraying the HfSiO4 powder material on the surface of the priming coat as a surface layer to form a multi-layer coating; and (4) carrying out a heat treatment on the multi-layer coating to obtain the environmental barrier coating. Due to the added heat treatment, the crystallinity of the HfSiO4 surface layer is improved, the binding force of each layer of the coating is better, the stability is higher, and the water and oxygen resistance of the environment barrier coating is greatly improved. The provided preparation method is simple and easy to control, and is easy for industrial production and application.

The invention discloses a method for preparing a super-high temperature anti-oxidation composite material and belongs to the technical field of aerospace materials. The method comprises the following steps: firstly, performing washing, combing, net overlapping and puncturing on a polyacrylonitrile pre-oxidized fiber in sequence so as to obtain a felt; further performing carbonization and activation with water steam so as to obtain a polyacrylonitrile-based activated carbon fiber felt; further performing electrochemical oxidation treatment, and mixing and soaking with ball-milling slurry consisting of aluminum nitride, boron nitride, absolute ethyl alcohol and organic silicon; further performing pre-sintering in the presence of argon, performing secondary soaking, and performing hot-pressing sintering molding in the presence of argon, thereby obtaining the super-high temperature anti-oxidation composite material. The product prepared by using the method is high in density and excellent in sintering erosion resistance and high-speed air flow impact resistance, is capable of meeting use requirements of high-temperature conditions of 2000 DEG C or greater, and has wide application prospects.

The invention provides high-strength alloy structural steel for a hydraulic cylinder of a fracturing pump. The steel comprises the following chemical elements in percentage by weight: 0.30-0.36% of C,0.23-0.28% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.05-0.10% of Si, 3.20-3.30% of Ni, 1.40-1.50% of Cr, 0.55-0.60% of Mo, 0.11-0.15% of V, less than or equal to1.5 ppm of H, less than or equal to 112 ppm of O, less than or equal to 70-120 ppm of N and the balance Fe. Meanwhile, the invention further provides a preparation method of the structural steel, thestructural steel obtained through the preparation method is used for manufacturing a hydraulic cylinder of a fracturing pump, under the severe working condition of shale gas exploitation, the servicelife of the product can be prolonged, the use cost can be reduced, the quality is stable and reliable, unpredictable cracking failure and production accidents in the operation process are avoided, andthe requirements of oil-gas field deep well fracturing and shale gas exploitation are met.

The invention discloses a centrally installed structure of a diesel engine fuel filter. The technical scheme is as follows: an engine oil cooler is fixedly arranged at the side of a diesel engine cylinder body, and an engine oil cooler cover is cast with a flange surface for installing the fuel filter; the fuel filter with a mounting flange is fixedly arranged on an outer cover of the engine oil cooler. An oil return pipe assembly of the fuel filter and an oil inlet pipe assembly of the fuel filter are respectively connected with an injection pump. The injection pump is positioned at the front end of the diesel engine, and one end of an injection pump oil inlet pipe is connected with the fuel filter; the other end of the injection pump oil inlet pipe is connected with the injection pump. With the structure, the control flexible axle of a vehicle is conveniently arranged, and meanwhile, the length of a fuel pipeline is shortened by about one third. Because the fuel filter is directly arranged on the engine oil cooler cover without a cantilever beam, the contact areas of two joint surfaces are large, the vibration amplitude is small, the shaking problem of the fuel filter is significantly improved, and the centrally installed structure is suitable for assembly systems of a plurality of diesel engine fuel filters.

The invention discloses glass-flake mastic resin special for flue gas desulfurization and belongs to the technical field of chemical coating. The glass-flake mastic resin comprises matrix resin, modified glass flakes, modified sepiolite, a coupling agent, a defoaming agent and an accelerant, wherein the matrix resin is formed by phenolic aldehyde epoxy type vinyl ester resin and modified unsaturated polyester resin. A preparation method of the glass-flake mastic resin includes: mixing the matrix resin and the modified sepiolite, shearing and dispersing to obtain a dispersed material, adding the dispersed material, the modified glass flakes, the coupling agent, the defoaming agent and the accelerant into a kneading machine, kneading, and performing vacuum defoaming, discharging and packaging to obtain the glass-flake mastic resin special for flue gas desulfurization. The prepared glass-flake mastic resin is excellent in toughness, thermal shock resistance and corrosion resistance.

The invention provides a circuit board and a circuit module, the circuit board is used for bearing a packaging chip, the circuit board comprises a substrate, the substrate is provided with a chip bearing area corresponding to the packaging chip, and the chip bearing area comprises a first sub-area corresponding to an electric contact area of the packaging chip and a second sub-area located at the periphery of the first sub-area; the supporting structure is located in the second sub-area and arranged on the surface of the substrate. When the packaging chip is assembled on the circuit board, the periphery of the electric contact area of the packaging chip can be supported through the supporting structure, so that the corner position of the packaging chip is prevented from cracking and losing efficacy due to pressure, and the structural reliability of the packaging chip is ensured. As the supporting structure is arranged on the circuit board, the effective area of the packaged chip is not occupied, the compactness of devices in the packaged chip is ensured, the integration level of the packaged chip is improved, static electricity is not accumulated on the packaged chip, the structure on the packaged chip is prevented from being damaged due to static electricity release, and the reliability of the packaged chip is ensured.

The invention relates to a washing machine. The washing machine comprises a tank, a spraying arm and a power assembly, wherein the spraying arm is arranged in the tank, and the power assembly is connected below the spraying arm. The washing machine further comprises an air pump and an air guide pipe, wherein the air pump is arranged at the outer side of the tank, the air inlet end of the air guidepipe is connected with the air pump, the output end of the air guide pipe extends into the spraying arm, an air collecting cavity connected with the output end of the air guide pipe is arranged in the spraying arm, and air guide channels extending towards the direction of water outlet holes of the spraying arm are formed in the air collecting cavity. For the washing machine, the guide channels can guide the added air, so that the added air is rapidly sprayed out from the water outlet holes after generating a cavitation effect with a water flow and generating air bubbles in the water flow, then the cracking failure of the air bubbles caused by the excessively long conveying flow of the water flow is avoided, when the water flow mixed with the air bubbles is sprayed to bowls and dishes, theair bubbles in the water flow crack after contacting the bowls and dishes and generate a relatively large impact force, so that the stubborn dirt on the bowls and dishes or vegetables and fruits is scattered, and then a very good washing effect is achieved.

The invention relates to a manhole door sealing box and a tower-type supercritical boiler. The manhole door sealing box comprises a sealing box body, a plurality of protective tiles and a plurality of corner protectors, each protective tile covers the outer side of each water-cooled wall tube in a water-cooled wall, each corner protector is connected between two adjacent protective tiles, each protective tile is located at a position opposite to the edge of the sealing box body, the corner protectors are located at the positions opposite to the vertex angles of the sealing box body respectively, the edge of the sealing box body is connected with the protective tiles and fins in the water-cooled wall respectively in a sealed mode, and the vertex angles of the sealing box body are connected with the corresponding corner protectors respectively in a sealed mode. According to the manhole door sealing box, the technical problem that due to the arrangement of the manhole door sealing box, local stress on the connecting position of the sealing box and the water cooling wall is concentrated, and the water cooling wall is damaged is solved.

The invention relates to the technical field of tractors, in particular to a tractor frame and a traveling wheel system. The tractor frame comprises a front supporting cross beam and a rear supportingcross beam which are disposed opposite to each other. Side supporting longitudinal beams are fixed between the left end of the front supporting cross beam and the left end of the rear supporting cross beam and between the right end of the front supporting cross beam and the right end of the rear supporting cross beam. The intermediate portion of the front supporting cross beam is arched upwards,and the intermediate portion of the rear supporting cross beam is arched upwards. The side supporting longitudinal beams include main supporting beams, front oblique beams and rear oblique beams, wherein the main supporting beams extend forwards and backwards in a linear mode, the front oblique beams extending obliquely forwards and downwards are fixed to the front ends of the main supporting beams and used for mounting tensioning wheels, and the rear oblique beams extending obliquely backwards and downwards are fixed to the rear ends of the main supporting beams and used for mounting fixed wheels. The structure is more stable, an operator is more comfortable to use, and the operation is more cheerful.