53results about How to "Unaffected by temperature changes" patented technology

The invention relates to a warm-mixed auxiliary agent for asphalt mixture. The auxiliary agent is formed by uniformly mixing 93 to 97 percent of synthetic zeolite with 3 to 7 percent of granular sodium sulfate decahydrate by weight, wherein the synthetic zeolite includes 15 to 22 percent of crystal water, and the sodium sulfate decahydrate includes 55.9 percent of crystal water. Under normal temperature, the auxiliary agent is mixed with other raw materials according to the content of 0.3 to 0.5 percent of the total mass of the mixture, thereby preparing the product of the warm-mixed asphalt mixture; and other raw materials are 150 to 165 DEG C asphalt, 140 to 180 DEG C aggregate and mineral powder filling materials. During the blending of the mixture, the warm-mixed addition agent and the heated asphalt are added simultaneously, great amount of vapor generated by the moisture-containing auxiliary agent are released, which results in volumetric expansion of the asphalt, thereby forming foamed asphalt; meanwhile, the workability of the asphalt can be enhanced, the blending and mold temperature of the mixture can be reduced by 15 to 25 DEG C, exhaust emission can be effectively reduced, energy consumption is lowered, the aging of asphalt during blending is reduced, and the auxiliary agent has the advantages of simple preparation and low cost.

The invention belongs to the technical field of machining, and relates to a method for manufacturing a combined cam shaft, in particular to the method for manufacturing the combined cam shaft with a hollow tube mandrel. The method comprises the following manufacturing processing steps: firstly, straightening the hollow tube mandrel; secondly, performing tight fit and cold assembled positioning on a cam, a shaft neck component and a mandrel by using a numerical controlled assembling machine, and then realizing close connection of the cam, a shaft neck and the mandrel by machining expanding, so that the mandrel which generates plastic deformation is firmly combined with the cam and the shaft neck which generate elastic deformation; and finally, fixing drive components at the two ends of the cam shaft by a laser welding method. The method for manufacturing the combined cam shaft has the advantages of simple overall process, obviously reduced weight compared with a cast iron cam shaft, low integrated cost and high assembly precision, and completely meets the using requirements on the cam shafts of various automobile engines.

The invention discloses a platform type horizontal plane planar motion mechanism. The motion mechanism comprises a mechanism frame 14, a straight bearing 8, a roller bearing 15, a ball screw 11 and a swaying servo motor 20, wherein the mechanism frame is connected with an auxiliary trailer 10; an encoder 17 and a swaying frame 9 are connected with the mechanism frame 14 through the straight bearing 8 and the roller bearing 15 to form a swaying component; a composite bearing 12, a worm gear 13, a circumferential guide rail 6, a yawing servo motor 18, an encoder 19 and a connecting plate 5 are connected with the swaying frame 9 through the worm gear 13 to form a yawing component; the distance between a front connecting rod and a rear connecting rod 3 can be adjusted by a positive and negative screw 4; the lengths of the connecting rods 3 can be adjusted by a trapezoidal lead screw 7; and the upper ends of the front connecting rod and the rear connecting rod 3 are connected with the connecting plate 5, while the lower parts are connected with a joint 1, a force balance 2 and a ship model 16. A linear motion guide rail consisting of the straight line bearing and the roller bearing is adopted in the swaying component, so the swaying component has the advantage of high stability, large amplitude, and high precision. A rotary mechanism consisting of the composite bearing, the circumferential guide rail, the worm gear and a worm is used as the yawing moving component, so that the yawing moving component has the advantages of stable rotation, wide range of rotation angle, large torque, high self-locking property and high accuracy. The distance between the front connecting rod and the rear connecting rod and the lengths of the connecting rods are adjusted by using the positive and negative screw and the trapezoidal lead screw, so the mechanism has the advantages of convenience, accuracy and suitability for ship models with various specifications.

The invention provides a primary mirror floating support mechanism with a positioning film and belongs to the field of primary mirror support structure of photoelectric instruments. The primary mirror floating support mechanism comprises a mandrel, a second screw, a bottom plate, the positioning film, a pin roll, a disc spring and a four-way joint, wherein the bottom plate is in an annular structure and comprises an annular boss, an annular support boss, a bottom plate central groove and a bottom plate substrate flange; a through hole is arranged in the bottom plate substrate flange, the positioning film is annular, a positioning film central groove is arranged on the inner diameter edge of the positioning film, and a positioning film annular boss is arranged on the outer diameter edge of the positioning film; the four-way joint comprises a primary mirror mounting base and a four-way round table; and a primary mirror mounting hole is formed in the primary mirror mounting base. When the ambient temperature changes, the relative slip between the four-way joint and the bottom plate is caused by the relative extension or contraction deformation quality formed between the four-way joint and the bottom plate, the positioning film central groove can absorb stress through self deformation, the stress is prevented from being transferred to the bottom plate, so that the heat stress between the bottom plate and the four-way joint is released, and the shape of the mirror surface cannot be affected by the temperature change.

The invention discloses a signal detection sensing structure and a manufacturing method thereof, and a signal detection method. The signal detection sensing structure comprises a first piezoelectric electret layer, a second piezoelectric electret layer and a bonding layer located between the first piezoelectric electret layer and the second piezoelectric electret layer. One side surface of the first piezoelectric electret layer, which is far away from the second piezoelectric electret layer, comprises a plurality of embossment structures. One side surface of the second piezoelectric electret layer, which is close to the first piezoelectric electret layer, is a smooth surface. The first piezoelectric electret layer is used for detecting a contact signal and/or a slide signal of a touch object. The second piezoelectric electret layer is used for detecting a contact signal of the touch object. Through a lamination structure of the first piezoelectric electret layer and the second piezoelectric electret layer, a single sensing unit can simultaneously detect the contact signal and the slide signal. By using the signal detection sensing structure, the structure is simple; sensitivity is high; there is no pyroelectric effect; in a work temperature range, the structure is not influenced by temperature changes; and high precision detection of the contact signal and the slide signal can be realized.

The invention provides a circuit to eliminate Venturi oscillator amplitude drift, composed of Venturi oscillator, operational amplifier circuit, first detector circuit, A/D converter and also second detector circuit. Where the second detector circuit's input end is connected with the Venturi oscillator's output end, and the second detector circuit's output end connected with the A/D converter's reference voltage input end; the Venturi oscillator's output end and the operational amplifier circuit's input end are connected with two ends of the equivalent resistor, respectively; the two detector circuits are the same circuit. The reference voltage and the measured voltage will drift in the same proportion, thus able to eliminate the temperature drift of amplitude, and the measured result can not be influenced by temperature variation, basically. It has advantages of simple method and outstanding effect.

The invention discloses a measuring device and a method of a polarization maintaining optical fibre Verdet constant. The measuring device mainly comprises a light source and isolation module, a polarization control injection module, a magnetic field and modulation module, a precision moving platform, a polarization beam splitter, a photoelectric detector, a signal processing module and a peak value detection module. A certain characteristic shaft of an optical fiber to be measured is coupled with a counter shaft of the polarization beam splitter at the exiting end. The measuring method comprises the following steps of changing light sent by a laser into circularly polarized light through the polarization control injection module and then outputting to the optical fiber to be measured, separating the light into two bundles of light through the polarization beam splitter, moving a guide rail to control the position of a magnetic filed, collecting two bundles of light intensity, conducting processing on the two bundles of the light intensity to obtain a corresponding voltage signal peak value, and further calculating a Verdet constant of the polarization maintaining optical fibre. The measuring device is simple and easy to operate, ensures maximum measured sensitivity, simultaneously avoids a measuring error caused by counter shaft operation and angle adjusting of the optical fiber injection end, and further improves measuring precision.

The invention relates to a pressure-maintaining and pressure-relieving control system for a large-tonnage cylinder of a steel-tube finishing straightening machine. The pressure-maintaining and pressure-relieving control system comprises two-way plug valves, control valves, a direct-acting relief valve and pressure gages which are connected with a main cylinder, a first quick cylinder and a second quick cylinder, wherein the pressure relief of the main cylinder is controlled by a first two-way plug valve and a first control valve; the pressure relief of the first and second quick cylinders is controlled by a second two-way plug valve and a second control valve; and the pressure relief of a system oil way is controlled by a third two-way plug valve and a third control valve. In the pressure-maintaining and pressure-relieving control system, the two-way plug valves are controlled to be switched on/off by the power-on/off of the control valves, so as to realize the pressure maintenance and the pressure relief of the system. The effective pressure maintenance and the impact-free pressure relief of the system are realized by the pressure-maintaining and pressure-relieving control system provided by the invention which has the advantages of convenience in debugging, high response speed, high oiling capability, small liquid flow resistance, compact structure, reliable property and the like, and is suitable for various steel-tube finishing straightening machines.

The invention relates to the field of production equipment of a stay rope for a cable-stayed bridge, in particular to a precision control method for stay rope manufacturing. The precision control method for stay rope manufacturing is characterized by being performed by the following steps in sequence: (a) a steel wire (11) with a standard length is manufactured; (b) the standard steel wire (11) is woven into stay rope parts (10); (c) the twisting is performed; (d) the cutting is performed; and (e) the stay rope is cut off again after a cutting position is calculated. The precision control method for stay rope manufacturing is convenient to use and high in measurement precision.

The invention belongs to the technical field of aviation, and relates to a high-temperature pipeline vibration isolator on a plane for cutting off the transmission of vibration force of airplane equipment in a high-temperature bleed air pipeline. The high-temperature pipeline vibration isolator adopts a vibration isolation combinational design, and consists of three vibration isolation mechanisms. The high-temperature pipeline vibration isolator has a large angular displacement and high vibration isolation performance, endures high temperature corrosion, is not influenced by temperature changes, has high sealability, cannot age or creep, has a long service life, and has small characteristic changes during mass production.

The invention relates to a hydrostatic leveling instrument for measuring liquid level based on image analysis, and a measurement method. The hydrostatic leveling instrument comprises camera obscuras,a water pump cabinet, a water tank, a communicating pipe and a bracket; more than two camera obscuras are provided; a measuring cylinder, a diffused light screen and a camera are arranged in each camera obscura; each camera obscura is a breathable and non-transmitting tank body; the measuring cylinder is arranged to close to the inner wall of one side of the camera obscura, and the diffused lightscreen is vertically arranged between the measuring cylinder and the adjacent inner wall; the camera is arranged at the inner wall opposite to the diffused light screen; the bracket supports the communicating pipe, and the communicating pipe serially communicate the water pump cabinet and the water in the measuring cylinder in each camera obscura, and the water pump cabinet is connected with the water tank through the pipeline; the measurement method of the hydrostatic leveling instrument for measuring the liquid level based on the image analysis comprises the following steps: step one, placing equipment; step two, collecting images; step three, preprocessing the images; and step four, computing the image related information. The liquid level is measured by adopting the image analysis technology, the change of the water surface area specific value can be directly measured, the error caused by manual data reading and computation can be avoided, and more accurate sedimentation data can be obtained.

The invention belongs to the technical field of batteries, and particularly relates to an electrode additive, a preparation method thereof and a positive plate. The preparation method of the electrode additive comprises the following steps: mixing a titanium source, an aluminum source, phosphate radicals, a lithium source, an acidic complexing agent, alkali liquor and an alcohol solvent to form sol, and drying to obtain a lithium titanium aluminum phosphate precursor; carrying out first sintering treatment on the lithium titanium aluminum phosphate precursor in an inert atmosphere, and then carrying out second sintering treatment in a mixed atmosphere containing oxygen to obtain an electrode additive; the electrode additive comprises a porous titanium-aluminum-lithium phosphate core, a carbon material filled in pores of the titanium-aluminum-lithium phosphate core, and a carbon shell layer coated on the outer surface of the titanium-aluminum-lithium phosphate core. According to the preparation method of the electrode additive, the carbon material filling and coating layer is generated in situ while the lithium titanium aluminum phosphate is generated, the process is simple and convenient, the efficiency is high, and the preparation method is suitable for industrial large-scale production and application.

The invention relates to the field of electronics, in particular to a low-temperature-coefficient reference source adopting operational amplifier negative feedback, which is characterized in that a fully differential operational amplifier A1 amplifies negative temperature coefficient voltage and positive temperature coefficient voltage and then adds the negative temperature coefficient voltage andthe positive temperature coefficient voltage to output a low-temperature-coefficient voltage to an inverting input end of an operational amplifier A2; the reference voltage Vout output by the operational amplifier A2 is subtracted by positive temperature coefficient voltage output after being amplified by the fully differential amplifier circuit through the operational amplifier A3, then is inputto the positive phase input end of the operational amplifier A2, and is subtracted by low temperature coefficient voltage at the reverse phase input end of the operational amplifier A2 to form a negative feedback loop. A reference voltage Vout with a linear ultralow temperature coefficient is generated through automatic adjustment. A positive temperature coefficient voltage and a negative temperature coefficient voltage are generated by the voltage generation circuit and output to the operational amplifier feedback circuit, and then the voltages are output through the buffer output circuit toform a final reference voltage which is not affected by temperature change, has a linear ultralow temperature coefficient and is high in drive.

The invention discloses a temperature recorder in cold-chain transportation. The temperature recorder comprises a Bluetooth communication unit, a temperature sensor, and a hand-held device. The Bluetooth communication unit is used for carrying out Bluetooth communication with an external hand-held device. The temperature sensor is used for acquiring ambient temperature information. The hand-held device connected with the Bluetooth communication unit and the temperature sensor respectively is used for monitoring a temperature signal returned by the temperature sensor in real time, transmitting temperature information to the external hand-held device by the Bluetooth communication unit, monitoring whether the temperature exceeds a set value I and is smaller than a set value II in real time, sending an alarm signal to the hand-held device if so, carrying out timing simultaneously, determining the failure of the transport if the timing time exceeds set time T1, and sending transport failure information to a control unit of the external hand-held device by the Bluetooth communication unit. The recorder has characteristics of being capable of recording a transport process accurately, having an irreversible transport failure recording way, having a small, exquisite, and simple structure, and being convenient to use.

The invention relates to an all-optical fiber real-time measurement tiltmeter based on Bragg grating. The all-optical fiber real-time measurement tiltmeter based on Bragg grating is characterized in that the tiltmeter comprises an input optical fiber segment, a detection optical fiber segment and a vertical segment, Bragg optical fiber grating is arranged inside the detection optical fiber segment, one end of the detection optical fiber segment is connected with the input optical fiber segment, the other end of the detection optical fiber segment is connected with the vertical segment, and the input optical fiber segment is provided for importing detection light into the detection optical fiber segment. The all-optical fiber real-time measurement tiltmeter has beneficial effects of simple structure, small size, high sensitivity, high measurement accuracy, no requirement of mechanical transmission structure, and independence of temperature variation.

The invention relates the water-soluble colored putty paint, comprising 20-40wt% calcium powder, 50-80wt% powder enamel, and 0.4-0.8wt% hydroxypropylmethylcellulose or 0.2-0.4wt% cellulose ethyl ether. The invention has the advantages of good water resistance, hardness, long life, nondiscolouring, convenient transport, storing and construction.

The invention discloses a bias working point automatic control system based on temperature drift compensation. A method comprises the steps: monitoring and recording the output optical power of the modulator through a feedback loop module; calculating the ratio of the output optical power to the maximum output optical power to serve as the measurement value of a bias working point at the initial temperature and monitoring the fundamental wave and second harmonic components of a pilot signal; performing calculating to obtain a modulator bias phase coefficient and a phase coefficient corresponding to each power ratio, taking the phase coefficient at the moment as a direct-current bias phase coefficient standard value, completing initialization work of a modulator bias working point, and closing the pilot signal; enabling the temperature monitoring module to detect the real-time temperature of the modulator, and sending a control signal to the feedback loop module when the temperature changes; enabling the feedback loop module to receive the control signal, starting a pilot method to correct the working point, and continuously adjusting the bias voltage until the standard value driftsclose to zero, so the stability of any bias working point is realized, and the influence of temperature change is basically avoided.

The invention discloses a preparation method of a magnesium-erbium-cerium fused fireproof profile, and relates to the technical field of fused fireproof profiles. The preparation method comprises following steps: weighing following raw materials: magnesia, erbium oxide, zirconia, and cerium oxide, wherein in the raw materials, magnesium accounts for 92.5 to 97 parts, erbium accounts for 1 to 3 parts, zirconium accounts for 0.5 to 1.5 parts, and cerium accounts for 1.5 to 3 parts; mixing and evenly stirring the raw materials in a mixing device; adding water, stirring to form a mixed material; drying the mixed material, adding the mixed material into an arc furnace at a time, fusing the mixed material, wherein during the fusion process, a microwave vibration mode is adopted, after the mixedmaterial is completely melted, taking out the electrodes, pouring the solution in the furnace into a profile grinding tool, and cooling. Cerium oxide and erbium oxide are added to improve the toughness and slag erosion resistant performance of the profile; one-time smelting and moulding is adopted, during the fusion process, a microwave vibration mode is adopted, the porosity of the profile is reduced, and the output and quality are both improved.

The invention relates to a self-circulation air deodorizing box. The self-circulation air deodorizing box comprises a box body and a box cover which are detachably connected, wherein the box body comprises a base and a chemical chamber; the chemical chamber is positioned in the center of the box body; the side wall of the chemical chamber is vertically intersected with the base; a deodorant is arranged in the chemical chamber; at least two filling material bearing plate supports are arranged on the periphery of the chemical chamber; a filling material bearing plate is arranged on the filling material bearing plate supports; a plurality of air holes are arrranged on the filling material bearing plate; and a filling material is filled on the filling material bearing plate. The self-circulation air deodorizing box provided by the invention has the following advantages: the deodorant is released to neutralize odor and peculiar smell molecules in air to generate odorless compounds, so the peculiar smell molecules in the air are thoroughly eliminated, and the function that purified air reacting with a plant deodorizing chemical in the chemical chamber is uniformly discharged into an external space in the air flowing process is achieved. Meanwhile, the self-circulation air deodorizing box utilizes a filler to purify the air, and is compact in structure, easy to popularize and convenient to use.