171results about How to "Avoid breakout" patented technology

The invention relates to a thin-walled circular type investment casting shell and a preparation method thereof, aiming at solving the defects that for the existing high-temperature alloy large thin-walled complicated circular type casting shell production technology, the casting pouring steel leaks, the surface quality is bad, the casting is difficult to clean, the size precision is low and the like, and belonging to the technical field of an aeroengine. A shell is made of new surface layer refractory powder, a back layer refractory powder and a sand lining material, and the invention provides a formula for all layers of paints of the shell; in addition, the invention further provides a manufacturing method of the thin-walled circular type investment casting shell, and the manufacturing method comprises the following steps: performing oil removal treatment on the surface of a wax mold module, carrying out paint preparation, sand lining and drying, shell dewaxing and shell roasting procedures, and particularly, the reinforcement step is added during the sand lining process, so that the shell has excellent high-temperature performance and good collapse performance at low temperature, and can bear molten metal with the pouring temperature being higher than 1600 DEG C, and can be used for casting high-temperature alloy large thin-walled circular vacuum castings such as K4169, K438, K418 and K4648.

A method is provided for operating a sliding closure for a metallurgical vessel. The sliding closure includes two tensionable fireproof closure plates opposing one another, with each of the two closure plates being slideably positioned within a corresponding housing part. Spring elements are provided for tensioning the closure plates, wherein one of the closure plates, along with its corresponding housing part, is slideable and can be moved into a closed or open position by a drive member. The method comprises: performing an offline and/or an online diagnosis of an operating condition within an area of the closure plates, by measuring at least one of size, temperature, pressure and force associated with the sliding closure so as to obtain at least one measured value, and evaluating the at least one measured value either directly or together with additional relevant process parameters; and based upon the diagnosis, either continuing use of the sliding closure or discontinuing use of the sliding closure.

The invention relates to a wall-climbing fire-fighting robot for high-rise buildings. Each robot is provided with a notebook computer and is controlled by one firefighter to run, the robot is used to replace the firefighter to carry out fire extinction work, and the safety of the firefighter is guaranteed. In a traditional fire-fighting mode, fire extinction operation cannot be carried out on high storeys due to range of a high-pressure water gun, but the robot enables a single chip microcomputer to serve as a core component of a control system so as to transmit all signals and control instructions to control the water gun (2), a spray thrower (18), monitoring cameras (3 and 19), a water pump and mechanical arms (10 and 11) to run. The robot climbs towards the high storeys on fire and controls the water gun (2) to put out a fire, and accordingly the problem of difficulty in fire extinction in the high-rise buildings is solved. Trapped people can be carried through a movable lifting frame (22) positioned on the back of a robot box, so that the trapped people can escape from floors on fire, and people's safety is guaranteed.

The invention discloses a ternary battery pack safety structure with a replacement device. The ternary battery pack safety structure comprises a battery tank and a gas replacement device, wherein the battery tank is connected with the gas replacement device; a battery pack is arranged in the battery tank; a plurality of single batteries are arranged in the battery pack; a shell of a sealing structure is arranged in the battery tank; a pressure release valve is arranged at the top of the shell; inflating valves are respectively arranged on two sides of the shell; the shell is full off a flame-retardant gas; the gas replacement device comprises a replacement gas generation unit, a discharged gas slow-store unit, a replacement controller, a gas inlet electromagnetic valve, a gas outlet electromagnetic valve and two gas conveying pipelines; the replacement gas generation unit is connected with the discharged gas slow-store unit; the gas inlet electromagnetic valve and the gas outlet electromagnetic valve are respectively arranged on the two gas conveying pipelines; two ends of the gas conveying pipeline with the gas inlet electromagnetic valve are respectively connected with one inflating valve and the replacement gas generation unit; two ends of the gas conveying pipeline with the gas outlet electromagnetic valve are respectively connected with the other inflating valve and the discharged gas slow-store unit.

The invention discloses a continuous casting method for low-alloy steel wide and thick slabs. The continuous casting method comprises the following steps: pouring molten steel from a tundish into a crystallizer; in the crystallizer, adding casting powder on the liquid level of molten steel; cooling in the crystallizer, so that the molten steel is solidified into casting blanks with liquid cores, and then continuously pulling out the casting blanks with the liquid cores from the outlet of the crystallizer at a pulling speed Vc to pass through a secondary cooling zone so as to obtain completely solidified casting blanks, wherein the pulling speed Vc is controlled at 1.2-1.8 m/min, the binary basicity of the casting powder is 0.85-1.05, the viscosity of the casting powder is 0.05-0.15 Pa.s at 1300 DEG C, and the melting point of the casting powder is 1050-1150 DEG C. As the physical and chemical properties of the casting powder are reasonably controlled, the continuous casting method can effectively reduce the steel leakage alarm rate and that the continuity of production and the product quality are ensured is facilitated.

An elongate tape element, a flexible pipe body and method of producing a flexible pipe body are disclosed. The tape element (508) has a cross-sectional profile comprising a body portion (510) for being positioned between collapse resistant tape windings (501) such that each body portion (510) lies at least partially in a gap (512) between adjacent collapse resistant tape windings (501); and at least one wing portion (516) extending from an end region of the body portion, the at least one wing portion configured to span the gap and respectively abut with a radially inner surface of an adjacent collapse resistant tape winding.

The invention belongs to the technical field of aviation and space technology, and in particular discloses a liquid oxygen/kerosene engine test gas supply system which specifically comprises a liquid oxygen source, a gas production unit, a plurality of gas conveying units and a plurality of gas allocation units. The liquid oxygen/kerosene engine test gas supply system is characterized in that one end of the gas production unit is communicated with the liquid oxygen source; the other end of the gas production unit is communicated with the plurality of gas conveying units; each gas conveying unit is communicated with the plurality of gas allocation units. By the adoption of the liquid oxygen/kerosene engine test gas supply system, the purity of a gas can be controlled from the source, foreign matters can be prevented from entering an engine, and success of a liquid oxygen/kerosene engine ground test can be ensured.

The invention relates to the needleless injection field, in particular to a needleless injection connecting device, comprising a connecting tube, a push-pull plate and a pulling mechanism. Two first arc-shaped grooves are arranged on the inner tube wall of the connecting tube, and a first bayonet is arranged on the groove wall of each first arc-shaped groove. The push-pull plate is provided with asecond arc-shaped groove and a second bayonet. The pulling mechanism includes a plurality of pulling units. Each pulling unit includes a connecting rod, a first pulling claw and a second pulling claw, with the first pulling claw being fixed to one end of the connecting rod, and the second pulling claw being connected to the other end, and the first and second pulling claws being opposite. The connecting rod is rotatably arranged in the pipe wall of the connecting pipe, and a torsion spring is arranged between the connecting rod and the connecting pipe. When the torsion spring is in a naturalstate, the first claw is positioned in the first bayonet, and the second claw is positioned on one side of the second bayonet. As that technical scheme is adopt, the syringe is conveniently connectedwith the injection pen, and the burden of the patient's expense is lighten.

The invention discloses a plate-fin heat exchanger, which includes a heat exchanger core and a head. The heat exchanger core is stacked and cross-flow arranged with several layers of hot passages and several layers of cold passages, and is sandwiched by cover plates. Brazed and brazed, the hot channel is a layer of fins sandwiched between two layers of partitions and sealed by a rectangular seal, the cold channel is a layer of fins sandwiched between two layers of partitions and sealed by a flexible seal; the head is in the shape of a semicircular groove , the outer side of the head is a circular tube joint; after the entire plate-fin heat exchanger is processed, a rectangular stress relief joint is opened on the cover plate according to the length of the cover plates on both sides of the heat exchanger core through size calculation. The novel plate-fin heat exchanger of the present invention adopts a flexible seal structure with stress relief grooves and a cover plate with stress relief seams, which not only reduces the weight of the heat exchanger, but also greatly reduces the stress relief effects of the two flexible structures. The thermal stress is reduced, effectively avoiding the fatigue failure of the heat exchanger due to thermal stress in actual work, and improving the fatigue life of the heat exchanger.

The invention discloses an electroslag remelting slag system for duplex stainless steel. The electroslag remelting slag system is prepared from the following components in percent by weight: 50.0-65.0% of CaF2, 8.0-15.0% of Al2O3, 3.0-10.0% of CeO2, 15.0-20.0% of CaO, 3.0-5.0% of MgO, 1.0-3.0% of SiO2 and the balance impurities which are not more than 1%. According to the slag system, the slag viscosity changes gently as the temperature is reduced, and the high temperature plasticity and the strength of slag can be also improved, so that bleed-out and slag leakage are prevented. The conductivity of the slag can be reduced, the chemical stability of the slag can be improved, and the system has better deoxidizing and desulfurizing effects and inclusion absorption action, thereby playing a role of purifying molten steel deeply. As-cast grains can be refined, and the strength and the toughness of steel are improved. The electroslag remelting slag system is uniform to transfer heat and goodin lubricating effect, and the slag layer is kept stable and is melted uniformly.

A pavement cutting method and apparatus for cutting a concrete or asphalt pavement utilizes one or more cutter-mounting frames having one or more cutter assemblies mounted thereon for making a cut in a pavement. The leading end of each frame has a coupling for pivotally mounting the leading end of the frame to a towing vehicle for towing the frame so that the frame pivots about a vertical or substantially vertical pivot-axis passing through the coupling. Each of the one or more cutter assemblies has a driven rotary saw blade that is located in a common vertical or substantially vertical plane that contains the vertical or substantially vertical pivot-axis of the coupling whereby the saw blade of each of the one or more cutter assemblies follows the pivot-axis of the coupling when the frame is being towed in the cutting direction of travel for the pavement cutting apparatus.

The invention relates to a continuous casting method for producing non-magnetic steel on a straight-arc-shaped continuous casting machine. Molten steel is subjected to KR stirring desulphurization, nominal volume 120 t converter tapping and refining and temperature rising, molten steel chemical components are adjusted to be qualified, and the temperature of the molten steel ranges from 1460 DEG C to 1500 DEG C during ladle lifting; a large tundish is used, a dummy ingot is sealed, and a water gap of the tundish is centered; the molten steel is poured into the large tundish, a tundish covering agent is added, crystallizer protection slag is introduced, cold steel dropping, slag adding and slag changing operation is conducted on the molten steel level in a crystallizer, the typical drawing speed is set to range from 0.30 m/min to 0.6 m/min, and the typical overheat degree ranges from 20 DEG C to 60 DEG C; and a crystallizer expert system is used for controlling so as to avoid the steel leaking risk in the casting process, a dynamic secondary water cooling and dynamic soft reduction technology is adopted in the descending process for removing surface longitudinal cracks generated in the casting process, and the molten steel yield is increased in a two-converter molten steel casting manner.

The invention relates to a dewaxing structure for a seed technique seeding module, and belongs to the technical field of investment casting. The dewaxing structure for the seed technique seeding module comprises a pouring cup, a transverse pouring gate made of wax, a straight pouring gate made of wax, an inner pouring gate made of wax and a bottom plate, wherein the bottom of the pouring cup communicates with the transverse pouring gate, the bottom of the transverse pouring gate communicates with the top end of the straight pouring gate arranged vertically, and the bottom end of the straight pouring gate penetrates through the bottom plate and then is blocked tightly through a first plug assembly. The dewaxing structure has the beneficial effects that a dewaxing pin is arranged at a seed seeding device or a flow gate which cannot be completely dewaxed through the straight pouring gate so that the wax can be completely discharged, the mold shell dewaxing pressure is reduced, and mold shell spalling caused by wax material accumulation and expansion in the mold shell dewaxing process is reduced; and an upright mold shell placing and dewaxing mode reduces the influence on a mold core in a mold shell in the dewaxing process is reduced, and can effectively prevent the mold core from being broken and deviated.

The invention discloses lightweight fluorine-free environmental protection continuous casting protective slag for enamel steel. The continuous casting protection slag comprises the following components including, by mass 22%-38% of CaO, 21%-37% of SiO2, 0.8%-3.0% of Al2O3, 1%-7% of MgO, 5%-20% of heating agent Si- Ca, 0.7%-2% of Li2O, 2%-8% of B2O3, 5%-10% of Na2O, 5%-17% of elemental C and unavoidable impurities; and the slag must meet: [CaO]/[Sio2] is greater than or equal to 0.8 and less than or equal to 1.0, namely, the alkalinity of the protective slag is 0.8- 1.0 The ratio of the heatingagent Si-Ca is 36-40 %: 64- 60%. The protective slag of the invention can reduce the occurrence of cold junction steel on a liquid surface by adding suitable heating elements without changing the alkalinity of the protective slag after the addition, and the steel leakage can be avoided; by adjusting a flux, another one or several substances are used for replacing fluoride, so the corrosion of thefluorine to a casting machine and the impact on human body are reduced.

The invention discloses a steel ladle gas-breathable upper water gap seat brick and a method for controlling a steel ladle to unload slag by same. The steel ladle gas-breathable upper water gap seat brick comprises a steel ladle upper water gap seat brick body, a gas-breathable plug, a gas chamber box, a gas-breathable plug base, a gas-blowing pipeline, a runner hole and an upper water gap mounting hole. The control method comprises the following steps of: 1) putting the steel ladle upper water gap seat brick at a bottom tap hole of the steel ladle, and enabling the gas-blowing pipeline whichgets out from the steel ladle gas-breathable upper water gap seat brick to communicate with a gas path pipeline; 2) when a ratio of height of molten steel in the steel ladle to height of the steel ladle is 1 to (16-35), blowing inert gas into the molten steel through the gas-blowing pipeline, forming a circular concave region free of a slag layer on the surface of molten steel, and restraining steel ladle from unloading slag; and 3) when the steel ladle has slag unloading, closing a steel ladle water hole, and stopping blowing gas through the gas-blowing pipeline. According to the steel ladlegas-breathable upper water gap seat brick disclosed by the invention, argon gas is blown in at a last stage of casting, the circular convex region free of the slag layer is formed on the surface of molten steel, steel ladle slag unloading caused by conflux vortex and drainage sunken pits is effectively restrained, casting margin, which is reduced by 35% or more in comparison with existing castingmargin, of molten steel in the steel ladle is reduced.

The invention discloses a chronic subdural hematoma drill cleaning drainage pipe which comprises a rubber pipe, wherein the rubber pipe comprises a short arm and a long guide pipe; the middle part of the short arm is vertically communicated with the long guide pipe; the overall shape of the short arm and long guide pipe is of T shape; a drainage hole a is arranged in the other side of the corresponding short arm at a hollow joint of the long guide pipe and the short arm; an opening of the drainage hole a is arranged as an indent arc-shaped opening; a drainage hole b and a drainage hole c are respectively arranged at tail ends of the two ends of the short arm; the openings of the drainage hole b and the drainage hole c are arranged as downward slant openings. According to the chronic subdural hematoma drill cleaning drainage pipe provided by the invention, the short arm of the drainage pipe is in contact with brain tissue during a cleaning process; the point contact of the tip of the traditional catheter is changed into the line contact, so that the injury to the brain tissue and the cortical bridging vein is avoided; the water pressure during the cleaning process is reduced; the arachnoid is prevented from being broken; the cerebrospinal fluid is prevented from being communicated with the hematoma cavity; the occurrence rate of postoperative cerebrospinal fluid leakage is lastly reduced.

The invention provides a clamping fixture for a molten steel casting system long nozzle, which comprises a fixing support and at least two clamping blocks; the clamping blocks can be hinged with the fixing support in a rotating way; each clamping block respectively comprises a clamping part which is arranged on the inner surface of the clamping block and is matched with the outer surface of the long nozzle, a partition part which is arranged on the inner surface of the clamping block and is separated from the outer surface of the long nozzle to provide permissible pivot, and a supporting part which supports the long nozzle and leads the clamping block to be pivoted from a first position to a second position under the pressure of the long nozzle; wherein at the first position, the clamping part is separated from the outer surface of the long nozzle, and at the second position, the clamping part is clamped on the outer surface of the long nozzle. Being supported by the fixing support, the clamping blocks clamp the long nozzle so as to prevent steel leakage because of the inclined long nozzle, reduce the vibration signal loss and attenuation produced when molten steel and steel slag flow past the long nozzle, and improve the accuracy of slag-carry-over detection.

The invention relates to the technical field of a water conservancy project, and provides a high-end manufactured drainage valve for the water conservancy project. The drainage valve comprises propellers, wherein a pipeline is movably connected to the outer walls of the propellers, sliding balls are movably connected to the outer wall of the pipeline, springs are movably and elastically connectedto the outer walls of the sliding balls, and sliding rails are movably connected to the outer walls of the springs. According to the high-end manufactured drain valve for the water conservancy project, water flow drives the propellers to rotate, the propellers rotate to enable the water flow to advance rotationally, a centrifugal force of rotating water extrudes the sliding balls, the sliding balls push the sliding blocks to move, the pushing distance of the sliding blocks is related to the speed of the water flow, stand columns move on the outer walls of clamping grooves under the joint action of a pentagonal rail and a wheel disc, the size of an opening is changed by baffles, when the flow speed of water is too high, the opening formed by the baffles is maximum, the flow speed of water is reduced, the drain valve is prevented from being damaged due to the too high flow speed of water, and when the flow speed of water is too low, sludge accumulation is prevented, and the opening sizeof the drain valve is dynamically adjusted through the flow speed of water.

The invention discloses an inner hexagonal fine punching die which comprises a punching die body, wherein one end of the punching die body is configured as a conical end; a groove is arranged on the end surface of the conical end; a punching needle is arranged in the groove and comprises a six-edge column body and a head end; the head end is in a frustum-shaped structure provided with six edges; and cutting edges are arranged on the head end and all the six edges of the six-edge column body. As the groove is arranged on a contact surface (the end surface of the conical end) in a punching process, heat quantity generated by the punching needle in the punching process can be timely diffused out from the groove so that the inner hexagonal fine punching die in the invention prevents the phenomenon of punching and cutting due to reduced mechanical properties caused by an over high temperature; due to the design of included angles and cutting edges on the conical top of frustums on the six-edge column body and the head end, the working resistance is reduced, the surface quality of a product is improved, and the corners of an inner hexagon are full; and the service life of the inner hexagonal fine punching die is also prolonged, the using cost is reduced, and the quality of the product is ensured.

The invention provides a leakproof casting box, comprising an upper box and a lower box, wherein the joint face of the upper box is provided with a boss, and the joint face of the lower box is provided with a groove corresponding to the boss. The casting box provided by the invention can prevent seepage of molten steel in the box, thus steel leakage is avoided.