65results about How to "Reduced risk of bursting" patented technology

The invention discloses a high strength sprayed concrete for high ground temperature tunnels and a preparation method thereof. The concrete comprises following raw materials: cement, fly ash, slag powder, sand, coarse aggregate, glass beads, PVA fibers, steel fibers, modified rubber, a water reducer, a setting accelerator, and water. Low melting point water-soluble PVA fibers are adopted, after concrete reaches the melting point of the PVA fibers, fibers are melted, tunnels are formed, thus water steam in the concrete can be conveniently dissipated through the tunnels, the steam pressure in the concrete is reduced, the risk of bursting is reduced, at the same time, the melted water-soluble PVA fibers can largely enhance the inner cohesive force of concrete, and the cracking of a cement face is avoided. Through the cooperation of all raw materials, the prepared concrete has the characteristics of low heat conductivity coefficient, good anti-permeability, high interfacial bond strength,and little long-term strength loss. The long-term strength of concrete after spraying is largely improved. The cracking of high ground temperature concrete is avoided.

The invention discloses an online monitoring method for a low-cycle fatigue crack of an aero-engine turbine disc. An eddy current displacement sensor and a key phase sensor are arranged on a wheel disc shaft of a low-cycle fatigue tester of the aero-engine turbine disc so as to acquire a wheel disc shaft radial displacement vibration signal and a key phase pulse signal on line; a vibration signalof the wheel disc at a preset rotating speed in each load cycle is obtained; a real part and an imaginary part of the crack index are extracted from the vibration signal by adopting full-period discrete Fourier transform; and crack indexes of a plurality of cycles at the beginning of the test are selected as baselines, relative amplitudes and relative phases of the crack indexes are formed by obtaining vector differences to the baselines in the subsequent cycles, an alarm threshold is set according to a 3sigma criterion, and the fatigue crack of the turbine disc is monitored. According to theinvention, damage to the tester caused by burst of the wheel disc is avoided, shutdown inspection in the low-cycle fatigue test process is not needed, the test period can be shortened, and the test cost is reduced.

The invention relates to a multi-stage pump rotor (10) for a turbo molecular pump. The pump rotor (10) has at least two separate blade disk rings (17), each having a rotor ring (12) and at least one blade disk (14). A cylindrical reinforcement pipe (18), which surrounds the rotor rings (12) of the blade disk rings (17) on the outside without clearance, is provided between the blade disks (14) of adjacent blade disk rings (17). The reinforcement pipe (18) absorbs a large part of the tangential forces occurring during operation such that the pump rotor (10) has improved stability at high rotor speeds.

The invention discloses a double single-ended pumped two-rod series connection solid state laser. The double single-ended pumped two-rod series connection solid state laser comprises a first laser crystal, a first semiconductor laser pump source, a first pump light recycling device, a first thermal compensation negative lens, a second laser crystal, a second semiconductor laser pump source, a second pump light recycling device and a second thermal compensation negative lens; the first semiconductor laser pump source and the first pump light recycling device are formed into an excitation device of the first laser crystal; the second semiconductor laser pump source and the second pump light recycling device are formed into an excitation device of the second laser crystal. The double single-ended pumped two-rod series connection solid state laser has the advantages of improving the luminous efficiency of the laser due to the fact that pump light through the laser crystals is recycled through the pump light recycling devices; further improving the output power and stability of the laser due to the fact that compensation is performed on the thermal lens effect of the laser crystals through the thermal compensation negative lenses; achieving high-efficiency and high-output-power stable operation of the solid state laser.

The invention discloses a capacitive voltage divider. A lightning protection structure is arranged between a high voltage electrode plate and a wiring head, and therefore, the influence of lightning weather on the capacitive voltage divider can be decreased, and the use safety of workers can be improved; an optical voltage temperature sensing head is arranged in a base; sensor error can be reducedthrough using a self-healing compensation technology; round steel bars are arranged at two sides of the interior of a high epoxy sleeve; and after a high-pressure expander expands to a certain extent, the round steel bars will pierce the high-pressure expander, and therefore, the risk of the explosion of the high epoxy sleeve can be lowered. The capacitive voltage divider has the advantages of long service life, high safety factor, and bright market prospect.

The invention discloses a laser welding system pulse xenon lamp power detection circuit and a method thereof. The real-time monitoring of the use condition and the aging degree of the pulse xenon lamp can be realized, and the photoelectric conversion efficiency of the laser welding machine can be known, and therefore the risks of the crystal explosion caused by the aging of the pulse xenon lamp, or the fogging and the water leakage of the crystal of the laser device can be reduced, and at the same time, the stability of the laser control system can be improved.

The invention relates to a filtering and recycling system of a suction pressure feed tank truck and the suction pressure feed tank truck. The filtering and recycling system comprises a recycling pipeline, a cloth bag filtering device and a cyclone separating device, and further comprises a flow control assembly, wherein the cloth bag filtering device and the cyclone separating device communicate with each other; one end of the recycling pipeline communicates with both the cloth bag filtering device and the cyclone separating device; the other end of the recycling pipeline is used for communicating with a storage tank; the flow control assembly comprises a flow detecting element, a control element and a valve; the valve is arranged on the recycling pipeline and positioned at the end close to the storage tank; the flow detecting element is arranged on the recycling pipeline and used for detecting the material flow in the recycling pipeline; the output end of the flow detecting element iselectrically connected with the input end of the control element; and the output end of the control element is electrically connected with the input end of the valve. The suction pressure feed tank truck comprises the above filtering and recycling system. Therefore, the recycling pipeline can be effectively prevented from being blocked during back suction, and then the normal use of the filteringand recycling system can be guaranteed.

The invention discloses a dry-type transformer with a high-temperature protection function, and belongs to the technical field of dry-type transformers. According to the dry-type transformer with the high-temperature protection function, when the temperature of a transformer body abnormally rises, gas in a cooling tank is heated to expand to break a pre-fracture layer, at the moment, cooling liquid enters the cooling tank, and the transformer body can be effectively and temporarily cooled and protected, so the reaction and operation time of workers is prolonged; meanwhile, when the temperature continues to rise, a trigger layer continues to expand to extrude a protective deformation ball to a certain degree, mixed powder and glue raw materials in the protective deformation ball can flow out and be mixed after a pre-breaking layer is broken, and can be quickly polymerized, cured and adhered, so the interior of the first cavity becomes firmer, thereby improving the strength of the outer protective layer, improving the overall strength of the protective sleeve, and improving the use effect of the protective sleeve and the use safety of the transformer body.

The invention relates to an anti-explosion automatic breathable electric hot water bag. The anti-explosion automatic breathable electric hot water bag comprises a water bag body. A heater is arranged in the water bag body. A power jack connected with the heater is arranged on the outer portion of the water bag body. An exhaust port and a water injection opening are both formed in the water bag body. The inner portion of the exhaust port is connected with a breathable film structure. A water injection nozzle which can prevent injected liquid from overflowing in the reverse direction is arranged in the water injection opening.

The invention discloses an adhesive combined vertical roller, and particularly relates to a vertical roller used for hot rolled strip steel. The adhesive combined vertical roller comprises a roller sleeve and a shaft core which are glued and fixed through a cylindrical part fixation adhesive. A methacrylic ester fixation adhesive serves as the cylindrical part fixation adhesive. The working temperature of the cylindrical part fixation adhesive is -55 DEG C to 230 DEG C, the shear strength of the cylindrical part fixation adhesive is 15-32 MPa, the viscosity of the cylindrical part fixation adhesive is 125-7500 mPa s, the filling gap of the cylindrical part fixation adhesive is 0-0.5 mm, and the initial fixing time of the cylindrical part fixation adhesive is 10-60 min. The surface roughness of the combination face of the roller sleeve and the shaft core is Ra0.4 to Ra12.5. The adhesive combined vertical roller solves the problem that the vertical roller cracks due to unreliable factors of press fit force transmission of interference linkage, key linkage and the like and excessively-large assembly stress, and has the beneficial effects of being easy and convenient to assemble and stable in fixation force; and the machining accuracy can be reduced, the manufacturing cost can be reduced, the assembly process can be simplified, the production efficiency can be improved, and the energy consumption can be reduced.

The invention relates to a gas cooker heat-recycle heating cup device. The device comprises a turbine air pump, wherein the turbine air pump is internally provided with a turbine air wheel; the turbine air wheel is connected with a turbine water wheel through a turbine shaft; the turbine water wheel is arranged in a turbine water pump; the turbine water pump is communicated with a heat absorptiondisk; and the heat absorption disk is connected with the turbine water pump through a heating pipe. The device sufficiently utilizes afterheat of gas cookers to heat food, so that the heat utilizationrate of the gas cookers is improved and the energy is saved.

The invention relates to an Os element secondary oxidative distillation separation device comprising a gas source device, a gas washing device, a sample dissolving device, a heating device and an OsO4collecting device, wherein the gas source device is an ozone generator, and a washing liquid in the gas washing device is ethanol. Ozone with strong oxidizing property is used for carrying out secondary oxidation on the Os element in a decomposition liquid, and effective separation of the Re element and the Os element is realized under an ozone carrier band. Comparing with an air carrier band, under the same condition, the ozone carrier band has the advantages that the collection time can be shortened, the acidity of an OsO4 absorption liquid is reduced, the measurement signal of the Os element is improved by 1.2-10 times, the accuracy of dating analysis of the Re-Os isotope system is improved favorably, and the device is particularly suitable for treating sulfide mineral samples with theOs element content of 100 ppt or below.

The invention discloses an energy conversion demonstration device for teaching experiments. The energy conversion demonstration device comprises a support, an alcohol burner, a boiler, an impeller and a syringe needle, wherein the alcohol burner is placed on the support, the boiler is installed on the support and positioned above the alcohol burner, a water filling port and an air outlet pipe are arranged in the boiler, the air outlet pipe is connected with the syringe needle through an air guiding tube, the impeller is installed on the support and driven to rotate by the steam ejected by the syringe needle. A test tube is replaced by a boiler, which reduces the cracking danger of the test tube. After the water boils in the boiler, the impeller can rotate continuously through the high-pressure water vapor. The experiment phenomenon lasts long, and is convenient for the student to observe. The use of the boiler improves heat absorption efficiency. The energy conversion demonstration device is simple in structure and convenient to operate.