1070 results about "Resistance wire" patented technology

An apparatus for the extrusion of a solid wire into a resin or paste is disclosed. The apparatus consists of two main parts including an adapter for constraining the wire until mixing with the resin or paste (‘wire injector’), and a motor-driven gear system that feeds the wire into the injector (‘wire extruder’). With this system, a bare wire can be extruded allowing for the creation of lead-in / lead-out sections, or for use with a resin or paste without an inherent curing, drying, or solidifying mechanism. Additionally, this apparatus allows for the extrusion of small (30-40 AWG) wires, enabling unique applications such as the injection of a resistive wire where smaller diameter wires are advantageous for minimized electrical or thermal overhead.

The invention discloses an efficient anti-freezing and anti-blocking integrated induction heating system and method for an oil and gas pipeline, belongs to the technical field of anti-freezing and anti-blocking of oil and gas pipelines, and aims at solving the problems that in the prior art, heating efficiency is low, energy consumption is huge, heating uniformity and adaptability are poor, the system integration degree is low, and the intelligent degree is insufficient. Comprising the steps of S1, induction heating unit arrangement and power management; s2, real-time temperature monitoring and data acquisition; s3, intelligent data analysis and precise heat management; the electromagnetic induction heating principle is adopted, the induction coil directly heats the pipeline and the internal medium, heat conduction loss and heat energy radiation loss of heating modes such as traditional resistance wires and heat tracing bands are reduced, the intelligent power management module can optimize power supply and power adjustment, and the self-adaptive environment and load adjustment strategy is combined, so that the self-adaptive load adjustment is achieved. The heating power can be automatically adjusted according to the environment temperature and the pipeline load, the anti-freezing and anti-blocking effect is guaranteed, meanwhile, energy consumption is remarkably reduced, and the burden of an electric power supply system is relieved.

The heat accumulating type electric heater comprises a shell and a heat accumulator, a heat preservation and insulation layer is arranged on the inner side of the shell, the shell comprises a first shell section and a second shell section, and the shell is horizontal; the first shell section comprises an inlet section and a diffusion section, and the diffusion section is arranged to be in a conical shape. The diameter of the second shell section is larger than that of the inlet section. The two ends of the diffusion section are connected with the inlet section and the second shell section respectively. The heat accumulator is made of high-temperature-resistant alloy and provided with a plurality of heat exchange holes and heating holes, the heat exchange holes and the heating holes penetrate through the heat accumulator, heating units are arranged in the heating holes, and each heating unit comprises a resistance wire. According to the invention, gas flow heating is realized by adopting resistor direct heating and heat storage, the gas purity is high, and the test accuracy is good. The shell is of a horizontal structure, the length of an outlet pipeline can be reduced, temperature loss can be reduced, the defect that the temperature field is uneven due to the fact that the temperature of the upper portion of the heat accumulator is too high and the temperature of the lower portion is too low in the heat accumulation process can be overcome, and the temperature control precision reaches + / -1 DEG C.

The invention discloses flutter suppression equipment in continuous machining of long bars, and particularly relates to the technical field of flutter suppression, the flutter suppression equipment comprises a rack, a strip-shaped groove is formed in the inner wall of the top of the rack, a two-way threaded rod is connected to the inner wall of the middle of the strip-shaped groove through a bearing, and moving blocks are connected to the outer walls of the opposite positions of the two sides of the two-way threaded rod; connecting plates are fixedly connected to the outer walls of the tops of the moving blocks, connecting blocks are fixedly connected to the opposite sides of the two connecting plates, clamping plates are connected to the ends, away from the connecting plates, of the connecting blocks, heating resistance wires are embedded in the clamping plates, and the clamping plates are made of shape memory alloy. The surface of the clamping plate is connected with a vibration reduction composite layer. The vibration reduction composite layer plays a role in assisting flutter suppression and meanwhile carries out kinetic energy recovery work, through real-time online damping adjustment, flutter is effectively suppressed, certain electric energy is provided in cooperation with kinetic energy recovery, and the energy-saving effect is achieved.

The present invention relates to the technical field of solid waste treatment, and particularly relates to a separation device for environmental protection recycling of waste batteries, including a fixed frame, a collection box, a crushing roller, etc.; a collection box is installed under the fixed frame; two symmetrically arranged crushing rollers are rotatably connected to the upper side of the fixed frame. By using a resistance wire to short-circuit the lithium battery in the storage cavity, the present invention realizes the rapid discharge of the lithium battery, eliminates the process of soaking the lithium battery in salt water, shortens the time for recycling the lithium battery. Subsequently, during the process of pushing the lithium battery out of the discharge cavity, the heat shrinkable film is separated by the clamping plate and the first cutter, avoiding the subsequent separate separation treatment of the heat shrinkable film, improving the separation efficiency, reducing the recycling cost, and reducing the subsequent cleaning work of the heat shrinkable film. Moreover, during the process of crushing the lithium battery by the crushing roller, the lithium battery can be synchronously added to the storage cavity, so as to realize the synchronous progress of the discharge and crushing of the lithium battery, and improve the recycling efficiency of the lithium battery.

The present invention discloses a static calibration device and method for a thin film strain gauge deposited in situ on the surface of an aircraft engine turbine rotor blade. The present invention belongs to the field of high temperature strain testing technology. It is used to calibrate a thin film strain gauge deposited in situ on the surface of a rotating component in a high temperature zone such as an aircraft engine turbine rotor blade. The calibration device consists of a resistance wire heater, a turbine engine rotor, a thin film strain gauge deposited in situ on the surface of a turbine engine rotor blade, a thin film thermocouple, and a capacitive distance sensor. The strain of the thin film strain gauge is introduced by the centrifugal force caused by high-speed rotation, and the strain size is calibrated by a capacitive distance sensor; by calibrating the strain sensitivity coefficient of the thin film strain gauge at different temperatures, the decoupling of temperature and strain is achieved. The present invention provides an effective experimental platform and method for the calibration of thin film strain gauges deposited in situ on the surface of rotating components in a high temperature zone of an aircraft engine.

The invention relates to an asymmetric multichannel thermal flow sensor for integrated component detection and a signal processing method, and belongs to the technical field of sensors. The problems that a traditional symmetrical single-channel thermal flow sensor is limited in measuring range, saturated in output, insufficient in measuring precision and single in measuring flow are solved. The sensor comprises a flow inlet cavity, a flow outlet cavity and a measuring pipeline composed of five parallel circular pipelines, the middle pipeline is a component measuring pipeline, and the four pipelines on the periphery are flow measuring pipelines. A probe is arranged in the middle of the component measuring pipeline, a heating resistance wire is arranged in the middle of the flow measuring pipeline, and temperature measuring resistance wires are asymmetrically distributed on two sides. The pipeline is made of aluminum, and fillets are arranged at the joints to optimize fluid flow. The heating resistance wire is a nickel chrome wire, the temperature measuring resistance wire is a platinum wire, the component measuring probe is made of a platinum film, and the surfaces of the platinum film and the platinum film are insulated. An improved Wheatstone bridge circuit is adopted for signal collection, and precision and protectiveness are improved.

The invention discloses a fire extinguishing water spraying intensity detection method for propellant fire in the field of propellant fire extinguishing. A superspeed deluge system, an ignition system, a charging device and a weighing device are included. The ultra-high-speed deluge system comprises a high-speed detector, a control system, a quick opening valve, a sprinkler head, a water supply pipe, a pressure water supply device and an air supply device; the ignition system comprises a resistance wire, an ignition circuit and an ignition device.The fire extinguishing water spraying intensity detection method for the propellant fire is provided for solving the problems that the propellant fire cannot be extinguished through the water spraying intensity of an existing deluge system, and an ultra-high-speed deluge system cannot be effectively applied to a propellant production site. The problem that an existing propellant powder production place does not have a key parameter of fire extinguishing water spraying intensity is solved, effective application of the ultra-high-speed rain extinguishing technology in the propellant powder production place is achieved, and safety of production personnel and equipment is protected.

The utility model belongs to the technical field of new energy automobiles, and particularly discloses a new energy automobile high-pressure liquid heater which comprises a heater body, a thick film heating plate, a heat insulation plate, a cover plate and an overheating protection circuit which are sequentially installed from bottom to top. The overheating protection circuit comprises four thermistors Rt1, Rt2, Rt3 and Rt4, an N-type MOS tube, a relay KJ, a heating resistance wire Rh, a resistor R1, a resistor R2, a resistor R3, a low-voltage direct-current power supply and a high-voltage direct-current power supply. According to the thick film heating plate, the water-drop-shaped turbulent flow columns and the turbulent flow teeth are arranged, so that the heat conduction efficiency and the heat exchange efficiency of the thick film heating plate in liquid are improved, and better convective heat exchange is realized; and the overheating protection circuit is arranged, so that the reliability of the heater during over-temperature protection is improved, and the heater is not only controlled by software.

The utility model discloses a high-temperature specific heat capacity tester which comprises a main control cabinet, a heating device, a connecting sleeve and a detection device, the heating device is fixedly installed on the detection device through the connecting sleeve, the detection device is fixedly installed on the main control cabinet, the heating device comprises an electric furnace, a test sample is hung in a heating hearth through a high-temperature-resistant wire to be heated, and the electric furnace is connected with the electric furnace. The detection device comprises an outer box body connected with the connecting sleeve, a constant-temperature heat insulation screen cover is installed in the outer box body, a temperature-controllable heat insulation screen cover is installed in the constant-temperature heat insulation screen cover through an insulation support, a heat measuring block is installed in the temperature-controllable heat insulation screen cover through an insulation support, and an electric heating tube and a thermocouple are arranged on the heat measuring block. A heating resistance wire is arranged on the side wall of the temperature-controllable heat insulation shield, a temperature difference thermopile is arranged between the heating resistance wire and the calorimetric block, and a copper pipe used for introducing constant-temperature hot water is wound on the side wall of the constant-temperature heat insulation shield. The high-temperature specific heat capacity tester disclosed by the utility model is high in measurement precision, simple to operate and small in size.

The present invention specifically relates to a variable-parameter satellite vibration isolator and an isolation method. The vibration isolator includes a thermistor, a metal shell, a resistance wire, a filling polymer, a connector, an upper fixed support, a heat insulation component, a lower fixed support and a wire; the filling polymer, the connector, the upper fixed support and the lower fixed support are all annular structures. The outer surface of the connector is connected to the inner wall of the upper fixed support. The outer wall of the upper fixed support is connected to the inner wall of the upper half of the filling polymer. The outer wall of the lower fixed support is connected to the inner wall of the lower half of the filling polymer. The inner wall of the lower fixed support and the bottom of the connector and the bottom of the upper half of the filling polymer enclose a bolt installation cavity. The outer wall of the filling polymer is provided with a metal shell. A resistance wire is wound around the outside of the metal shell. A heat insulation component is provided outside the resistance wire. The satellite control unit is connected to the thermistor and the resistance wire respectively through two wires.

The invention discloses a double-temperature-zone wafer heater temperature control system and method. The system comprises a wafer heater, a main unit, a measuring unit and a control unit. The wafer heater comprises an inner area heating disc and an outer area heating disc; the measuring unit comprises a temperature measuring device and a voltage and current measuring device; the control unit obtains a resistance temperature coefficient based on the heating temperature of the internal resistance wire and the voltage and current values of the internal heating line, calculates the heating temperature of the external resistance wire by combining the voltage and current values of the external heating line, and further adjusts the on-off of the corresponding relays to control the temperatures of the two areas. The control method comprises the following steps: acquiring the heating temperature of an internal resistance wire and voltage and current values of internal and external heating lines; obtaining the resistance temperature coefficient of the internal resistance wire and the heating temperature of the external resistance wire based on the data; according to the invention, the problem of double-temperature-zone heating control only equipped with a single-temperature-zone temperature measurement sensor is solved, and accurate measurement and control of the temperatures of the inner and outer temperature zones of the wafer heater are realized.

An electric heating assembly may include a sheath, a resistive wire, a thermally conductive electrical insulation, and a tubular body. The sheath may define an enclosed volume along a longitudinal length between a first end portion and a second end portion. The resistive wire may be disposed within the enclosed volume to generate heat in response to an electrical current. The thermally conductive electrical insulation may be radially positioned between the resistive wire and the sheath. The tubular body may be disposed radially inward from the sheath and define a vent channel extending from a vent inlet disposed within the sheath to a vent outlet held outside of the sheath.

The invention relates to the technical field of amorphous TiC ceramics, in particular to a wear-resistant plate based on an amorphous TiC ceramic wear-resistant coating and a surfacing process thereof, and the wear-resistant plate comprises the following raw materials in parts by weight: 20-40 parts of multi-element powder, 70-80 parts of Ti powder and 20-30 parts of C powder; the preparation process of the multi-element powder comprises the following steps: step 1, synthesizing Al2O3-Cr2O3 core-shell particles through a sol-gel method; 2, mechanical alloying is carried out; 3, sintering is conducted, and multi-element powder is obtained; according to the invention, Al2O3 coated Cr2O3 core-shell particles are adopted to solve the problem of reinforcement phase / matrix interface failure; in-situ amorphous TiC forming realizes instantaneous high temperature and rapid cooling under the powder blank density of 60-80% through resistance wire short-circuit self-propagating reaction, and breaks through amorphous phase preparation limitation.

The utility model relates to the technical field of thermal management, in particular to an automotive liquid ceramic heater with a temperature detection function. An automotive liquid ceramic heater with a temperature detection function comprises a ceramic body, a heating resistance wire and a temperature sensor resistance wire. The ceramic body comprises an upper ceramic layer and a lower ceramic layer; the upper ceramic layer is located above the lower ceramic layer, at least one mounting space is defined between the upper ceramic layer and the lower ceramic layer, and the temperature sensor resistance wire and the heating resistance wire are both located in any mounting space; the heating resistance wire is configured to generate heat after being electrified to complete external heating; the resistance wire of the temperature sensor is configured to change the resistance value along with high temperature change so as to realize temperature detection. Therefore, the temperature of the MCH can be detected, and the temperature acquisition precision is higher.

The utility model discloses electric heating maintenance equipment for concrete pouring in winter, which comprises a fixed base, a supporting mechanism mounted at the top end of the fixed base, an insulating plate mounted at the top end of the supporting mechanism, a transformer fixedly mounted at the top of the insulating plate, and a fixing piece arranged on one side of the fixed base. According to the electric heating maintenance equipment for concrete pouring in winter, the resistance wire with the insulating rubber skin is laid in a concrete structure, and after the resistance wire is powered on, two electrodes of the resistance wire form a conductive loop through unsolidified concrete, so that the resistance wire is fixed to the bottom end of the fixing part, and the resistance wire is fixed to the bottom end of the fixing part. At the moment, the secondary current of the transformer is large, the wire is heated and releases heat energy, the heat can be transmitted to concrete in a loss mode, and due to the fact that the heating resistance wire is embedded in the concrete, the generated heat can be completely transmitted to a concrete member. Therefore, it is guaranteed that the concrete is cured under the positive temperature condition.

The invention relates to the technical field of resistors, in particular to a high-performance heat dissipation load unit which comprises an air duct, a motor fixed to the air duct, a rotating shaft installed on an output shaft of the motor, a supporting disc fixed to the rotating shaft and a plurality of supporting fan blades fixed to the supporting disc in a spaced mode in the circumferential direction. The air duct is provided with an external liquid groove, and the outer end part of each supporting fan blade is provided with an external leading-out terminal inserted into the external liquid groove; the air duct is provided with an internal liquid receiving groove; an inner leading-out terminal inserted into the inner liquid receiving groove is arranged at the inner end part of each supporting fan blade; the supporting fan blades are insulators, and the two ends of the resistance wire of each supporting fan blade are connected with the outer leading-out terminal and the inner leading-out terminal of the corresponding supporting fan blade respectively, so that the resistance wires are electrically conducted through the conductive liquid. Compared with an existing load, the heat dissipation effect is good, the wind resistance is low, and the requirement for a draught fan is lowered. Whether the group of resistance wires are used or not can be adjusted by changing whether the external leading-out terminals are immersed into the conductive liquid in the external liquid tank or not, so that the power of the whole resistor unit can be adjusted.

The invention provides a nano-plastic detection device and method based on a magnetic adsorption-thermal cracking mass spectrometry technology, and solves the technical problem that the variety, content and physicochemical properties of nano-plastic in a water matrix are difficult to rapidly and accurately capture in the prior art. The pyrolysis device comprises a closed heating cavity, a resistance wire is wound on the closed heating cavity, the closed heating cavity is communicated with a carrier gas inlet pipe, a water vapor outlet pipe and a pyrolysis gas outlet pipe, and a sample groove is formed in the closed heating cavity; the sample introduction device comprises a sample introduction pipeline, and the sample introduction pipeline penetrates into the closed heating cavity in a sealed manner and is communicated with the sample groove; the groove bottom of the sample groove is a filter layer, the filter layer comprises a filter membrane layer, the filter membrane layer is connected to a ferromagnetic metal sheet, the aperture of filter holes of the filter membrane layer is smaller than the particle size of the nano-plastic, the heat-resistant temperature of the filter membrane layer is higher than the boiling point of the nano-plastic, and the ferromagnetic metal sheet is provided with a filtrate channel; the suction filtration device comprises a suction filtration head; the suction filtration head is communicated with the sample groove through a filter layer; the method can be widely applied to the technical field of nano-plastic pollution detection.

The utility model provides a pre-cleaning device and semiconductor equipment. Wherein the temperature compensation assembly is additionally arranged in the pre-cleaning device. And the temperature compensation assembly is used for performing temperature compensation on the edge area of the wafer. Furthermore, the temperature compensation assembly comprises a resistance wire and / or a heating lamp. And the resistance wire performs compensation heating on the etching agent sprayed on the edge area of the wafer so as to compensate the reaction temperature of the edge area of the wafer. And the heating lamp can directly irradiate the edge area of the wafer to carry out temperature compensation on the edge area, and the reaction temperature difference between the center area and the edge area of the wafer can be reduced through the heating lamp and the edge area, so that the problem that a reaction byproduct film layer is not uniform due to the temperature difference is avoided, and the yield of the wafer is improved. Therefore, the etching amount of each area of the wafer can be balanced, so that the pre-cleaning effect is improved, and the surface of the pre-cleaned wafer is ensured to have better uniformity.

The invention discloses a graphene microcrystalline far-infrared electric heating plate and a preparation method thereof. The graphene microcrystalline far-infrared electric heating plate comprises a base layer, a functional layer arranged on the base layer and a microcrystalline glass layer covering the functional layer, the base layer is formed by compounding silicon nitride ceramic and boron carbide short fibers, the volume fraction of the boron carbide short fibers is 15%-20%, the bending strength is larger than or equal to 800 MPa, and the heat conductivity coefficient is 80-100 W / (m.K); and the functional layer comprises an electric conduction and heat conduction layer and a far infrared radiation layer. The graphene microcrystal far infrared electric heating plate adopts a multi-layer composite structure, a functional main body is formed by compounding a graphene nanosheet and a hexagonal boron nitride nanotube, the square resistance is less than or equal to 100 omega / square, the heat conductivity coefficient reaches 500-800 W / (m.K), 30-second rapid thermal response is realized, and the heating response speed is increased by more than 90% compared with that of a traditional resistance wire; the far infrared radiation layer is compounded with nano titanium dioxide through tourmaline, and can stably emit far infrared rays of 8-14 microns, the emissivity is greater than or equal to 88% and is far higher than that of a common material and is less than 70%, and the blood circulation and metabolism of a human body are effectively promoted.

The invention provides a building curtain wall flatness detection device, and relates to the technical field of curtain wall plane detection, the building curtain wall flatness detection device comprises a shell, and four corners of the shell are provided with connecting columns; the edges of four corners of the soft film are respectively fixed at one end, far away from the shell, of each connecting column and are unfolded in a tiled state; the plurality of resistance wires are arranged in the soft film in a criss-cross manner, the resistance value of the soft film is changed when the soft film is stretched and deformed, and the plurality of resistance wires are respectively provided with an independent current loop; the display assembly is arranged on the shell, the resistance wires are electrically connected with the display assembly, and the display assembly is used for partitioning the longitudinally and transversely arranged resistance wires and is used for displaying corresponding current or voltage change data based on resistance changes of the resistance wires. According to the invention, the flatness of the curved building curtain wall can be conveniently detected, and the detection efficiency and accuracy are significantly improved.

The invention discloses a glue supply integrated processing system, comprising: a heating module for performing dynamic temperature control on glue; the constant-temperature stirring system is connected with the heating module and is used for realizing bidirectional mixing of glue under a constant-temperature condition; the heat-preservation glue storage tank is communicated with the constant-temperature stirring system and is used for stably storing the glue and maintaining the temperature; the intelligent glue supply device is connected with the heat preservation glue storage tank and used for self-adaptive quantitative output of glue; the central control system integrates a temperature sensor, a pressure sensor and a flow sensor. A heating module adopts a PID algorithm and a spiral flow guide circulating water path, the heat exchange efficiency is improved to 85% or above, the glue heating rate reaches 5 DEG C / min, the steady-state temperature fluctuation is smaller than or equal to + / -0.3 DEG C, and the energy consumption is reduced by 25% compared with that of traditional resistance wire heating. The temperature fluctuation in the heat preservation glue storage tank can be maintained to be smaller than or equal to + / -0.3 DEG C at the environment temperature of-10 DEG C to 50 DEG C through the vacuum heat insulation layer and the self-adaptive temperature compensation unit, and the storage stability of glue is remarkably improved.

The invention relates to the technical field of glass product production and processing equipment, and discloses an energy-saving glass bottle annealing device which comprises an annealing furnace body, an adjusting assembly is arranged in the annealing furnace body, an air cooling assembly is arranged in the annealing furnace body, and a circulating water pipe is installed in a main conveying belt. A nitrogen conveying pipe is installed in the annealing furnace body, a plurality of infrared heaters are arranged in the annealing furnace body, a plurality of heat insulation plates are installed in the annealing furnace body, and high-temperature resistance wires installed through insulation fixing blocks are arranged on the inner sides of the heat insulation plates. According to the invention, the position and spacing adjustment of the infrared heater is realized through the adjusting assembly, the air curtain isolation fan and the heat insulation gate cooperate to block heat dissipation, and meanwhile, the air cooling assembly, the circulating water pipe and the nitrogen conveying pipe are utilized to construct a multi-stage cooling system, so that the energy consumption of the device is reduced, and the annealing quality and the production efficiency of glass bottles are improved.

The invention belongs to the field of nano material preparation, and particularly discloses a preparation method and application of a narrow-diameter-distribution carbon nanotube, and the preparation method comprises the following steps: heating raw material mixed gas to 900-1500 DEG C for reaction, and introducing pulse gas in the reaction process to prepare the carbon nanotube, the raw material mixed gas contains a catalyst, a carbon source and an etching agent; the heating comprises at least two methods of plasma heating, microwave heating, silicon carbide rod heating, silicon molybdenum rod heating, resistance wire heating and electromagnetic induction heating. According to the preparation method disclosed by the invention, the high-quality narrow-diameter-distribution single-wall / double-wall carbon nanotubes can be prepared on a large scale, the single-time continuous operation time in actual production exceeds 45h, the unit yield can reach more than 190g / h, the purity of the product single-wall / double-wall carbon nanotubes is greater than 85%, the average G / D ratio is greater than 85, and the quality and the yield of the prepared carbon nanotubes are remarkably improved.

The invention relates to the technical field of material heat treatment, and discloses a transverse magnetic field heat treatment furnace which is characterized by comprising a rack, a vacuum pump, a hydraulic push rod, a furnace body, a circulating heat dissipation fan, a heating resistance wire, a second heat preservation layer, a magnetizing coil and a cooling fan. The circulating heat dissipation fan is connected with the top of the furnace body and extends into an inner cavity of the furnace body, the furnace body is connected with the vacuum pump through the hydraulic push rod, the heating resistance wire is wound on the outer surface of the furnace body and is of a spiral structure, the second heat preservation layer wraps the heating resistance wire and the outer surface of the furnace body, and the magnetizing coil is arranged on the outer surface of the second heat preservation layer. And the magnetizing coil is connected with the cooling fan. The temperature difference in the furnace can be reduced, the temperature uniformity in the furnace can be improved, the qualification rate of the annular magnetic core in the furnace can be increased, hot airflow can flow more uniformly in the furnace, heat accumulation is avoided, the phenomenon that the local temperature is too high or too low is reduced, and the temperature stability is improved.

The invention discloses a device and a method for preparing tantalum powder by reducing gaseous magnesium, and solves the problems of high oxygen content, poor particle uniformity, incomplete reaction and the like in the prior art. The device adopts a vertical multi-layer reaction furnace structure, and realizes efficient reduction of tantalum oxide through heating of a resistance wire and reaction with gaseous magnesium. The method comprises gaseous magnesium reduction and product post-treatment. The oxygen content of the tantalum powder prepared through the method is controlled to be 3000-6000 ppm, the specific volume reaches 80000-100000 mu F.V / g, the apparent density ranges from 1.5 g / cm < 3 > to 1.8 g / cm < 3 >, particle size distribution is uniform, and the method is suitable for large-scale production of electronic-grade tantalum powder.

The utility model provides an electric heating tube, a water tank and an electric water heater, comprising: a heating tube, the heating tube comprising a resistance wire and a connecting tube, the connecting tube having an accommodating cavity, the resistance wire being arranged in the accommodating cavity and being used for generating heat when energized; the wiring assembly is connected with the connecting pipe, and the resistance wire is electrically connected with an external power supply through a wiring terminal of the wiring assembly to supply power to the resistance wire; the vibration assembly is arranged in the containing cavity, the vibration assembly comprises a driving part and a shaking block, the driving part is fixed to the inner wall of the connecting pipe, and the driving part drives the shaking block to move in the containing cavity and enables the shaking block to shake in the moving process; when the shaking block shakes, the shaking block collides with the inner wall of the connecting pipe, and therefore the connecting pipe vibrates. According to the electric heating pipe, the water tank and the electric water heater, the technical problem that the heat transfer efficiency is affected due to the fact that impurities are prone to being attached to the surface of the electric heating pipe in the prior art is solved.

The invention relates to the technical field of bearing detection equipment, in particular to a multi-field coupling loading under-ring lubrication bearing friction torque measurement test bench and a detection method, the test bench comprises a mounting base, a support unit, a transmission unit, a loading unit and a detection unit, the support unit, the transmission unit and the detection unit are all connected with the mounting base, and the loading unit is connected with the loading unit. The loading unit is connected with the detection unit, a main shaft of the supporting unit is divided into a detection section, a supporting section and a driving section, the detection section is connected with a detection bearing seat and a to-be-detected bearing set on the detection unit, the top of the detection bearing seat is connected with the sensor assembly, and a conductive mounting hole and a resistance wire mounting hole are formed in the detection bearing seat. By the adoption of the structure, the friction torque of the to-be-detected bearing pack can be measured under force-electricity-heat multi-field coupling loading, meanwhile, under-ring lubrication is carried out on the to-be-detected bearing pack, and high-precision measurement of the bearing friction torque integrating multiple factors is achieved.

The invention discloses a harmonic reducer integration-based strain torque sensor, and relates to the technical field of sensors, the harmonic reducer integration-based strain torque sensor comprises an annular strain gauge and a signal acquisition module, and the annular strain gauge is electrically connected with the signal acquisition module; the annular strain gauge is mounted on the bottom surface of the flexible gear and is concentric with the flexible gear; the signal acquisition module is mounted outside the hollow inner shaft of the flexible gear; during working, when output power of the flexible gear is subjected to resistance, the bottom surface of the flexible gear generates strain, the annular strain gauge converts a strain signal into an analog voltage signal through a Wheatstone bridge formed by a resistance wire grid, the analog voltage signal is output to the signal acquisition module, and a force value signal is obtained after digital-to-analog conversion; by arranging the annular strain gauge on the bottom surface of the flexible gear, real-time detection of output torque is realized, extra flexible introduction of deformation of the peripheral surface of the flexible gear is avoided, structural deformation is reduced, interference of rotation of a wave generator on signals is effectively suppressed through a Wheatstone bridge design, and measurement precision and stability are ensured.

The invention discloses a novel gallium nitride reaction chamber heating structure and a use method thereof. The novel gallium nitride reaction chamber heating structure comprises a high-temperature furnace (103), a carrying table (106) and a gallium boat (101), the thermocouple A (102) is arranged on the side wall of the high-temperature furnace and is used for detecting the temperature in the furnace; the quartz cover (104) covers the lower part of the gallium boat and the carrying platform so as to form a reaction chamber; the manipulator (108) is mounted at the bottom of the high-temperature furnace, and the top of the manipulator bears the carrying table; the thermocouple B (109) is arranged in the manipulator and is used for detecting the temperature of the carrying platform; and the resistance wire (110) is mounted at the top of the manipulator and is used for heating the carrying table. The method has the beneficial effects that the corrosion of the pipe wall of the gas outlet of the gallium boat can be effectively reduced, the service life of the gallium boat is prolonged, the epitaxial film defects are reduced, and the single crystal growth quality is improved.