58results about How to "Not easy to fluctuate" patented technology

The invention discloses a comprehensive servo motor and harmonic speed reducer testing platform. The comprehensive servo motor and harmonic speed reducer testing platform comprises a machine frame, a vibration isolation platform, a linear guide rail and a magnetic powder brake, wherein the vibration isolation platform is arranged on the machine frame, and the linear guide rail and the magnetic powder brake are installed on the vibration isolation platform in a matched mode. The linear guide rail is provided with a wide-range torque revolving speed sensor, a first angle encoder, a harmonic speed reducer, a second angle encoder, a narrow-range torque revolving speed sensor and a servo motor. The comprehensive servo motor and harmonic speed reducer testing platform is simple and reasonable in structure, the load torque is not prone to fluctuation, data detecting accuracy is high, the system error is small, and assembling and adjusting are convenient.

The invention discloses a motor adhesive injecting device and an operating mode thereof. The device comprises a shooting cylinder which is provided with an outlet at the bottom, a pressure ram arranged inside the shooting cylinder, a drive screw connected with the upper part of the pressure ram, a fixing screw used together with the drive screw and a drive motor arranged on top of the drive screw. The rotation of a motor drives the screw to make the spiral movement inside the nut and drives a piston to have the axial displacement to act on the liquid. The operating mode is that the rotating axle of the motor is controlled to continuously rotate, discontinuously rotate, impulse rotate or reverse the axle to drive the piston to move up and down or vibrate correspondingly to the cylinder. With excellent response, the motor can control the injection rate accurately by the controlling the rotating angle. The motor can satisfy the requirements for accurate and rapid adhesive injecting for the constant running speed and uniform flowing speed of the liquid.

The present invention relates to safety monitoring system, and is flexibility monitoring method for large span bridge structure. Whole bridge pressure field is first established with water tanks set in the unchanged location, water pipes set horizontally and city water supply system to lead water pressure to deformation location of the bridge; and the pressure transducer is fixed to the measured part. The pressure change is converted into flexibility change and monitored with the computerized monitoring system, which consists of water tank, water pipes, pressure transducer, A/D converter, computer, etc. The present invention has high measurement stability, great measurement range, low measurement cost and high practical value.

The invention discloses a riveting device for sheet metals, which is used for performing riveting processing on the sheet metals which are overlaid in two layers or a plurality of layers. The device is provided with a riveting punching head (1) and a riveting concave die (2) which are connected with a gas-liquid pressurization system respectively; and in the riveting processing state, the riveting punching head (1) is pressed into one surface of the sheet metals which are overlaid in the two layers or the plurality of the layers, and protrusions formed on opposite surfaces of the sheet metals are pressed into a concave cavity of the riveting concave die (2). Due to adoption of the technical proposal, the riveting device for the sheet metals is easy to detect and control the connection quality, can achieve the aim of detection by the general detection mode, has stable riveting parameters which are difficult to fluctuate, can not generate pollutant and radiation which pollute the environment and harm the body health due to riveting, and avoids welding dropping of surface claddings and even components of sheet metal pieces caused by welding. Compared with the prior riveting technology, the riveting method is simple and has low cost.

The invention relates to a preparation method for polyoxymethylene dimethyl ether, which mainly solves the problem that the trioxymethylene conversion rates and the selectivity of DMM3 to 8 are low in the production of polyoxymethylene dimethyl ether at present. Methylal and trioxymethylene are adopted to react under effective reaction conditions in a catalytic distillation tower, component separation is carried out during reaction, part of condensed overhead vapour flows back, the other part is recovered, the overhead reflux ratio is 1 to 10, distillate returns into the tower, part of bottom material is vaporized by a reboiler and then returns into the catalytic distillation tower, the rest is adopted as recovered liquid, wherein the methylal, the trioxymethylene and the returning distillate enter between the two reaction sections of the catalytic distillation tower, and the catalyst in the catalytic distillation tower is heterogeneous acidic catalyst. The technical scheme effectively solves the problem, and can be used in the industrial production of polyoxymethylene dimethyl ether.

The invention relates to a semiconductor crystal manufacturing technology and aims to provide a crystal diameter control method for a Czochralski silicon single crystal growth process. The method comprises the following steps: when a silicon single crystal is produced by a Czochralski method, enabling the crystal to reach a stable state in the equal-diameter growth process; setting the actual pulling speed of the crystal as the current average pulling speed, and making the actual pulling speed close to the set pulling speed according to a preset change rate until the pulling speed of the crystal is constant and does not fluctuate with the diameter of the crystal; in the equal-diameter growth process of the crystal, controlling the diameter of the crystal by adjusting the power of a heater,and particularly adding variable period pulse type power output on the basis of the current heating average power. According to the method, through calculation of crystal diameter change speed and acceleration and critical value control, the key point judgment of power output time is more reasonable and accurate; the response time lag of the diameter change to power regulation can be shortened; the crystal diameter cannot be greatly disturbed, and the crystal diameter cannot easily fluctuate greatly.

The invention belongs to the technical field of oily sludge treatment and particularly relates to a pyrolysis desorption reaction kettle and treatment equipment including the same for oily sludge of an offshore platform. The pyrolysis desorption reaction kettle comprises a body (1), wherein a material inlet (11), a material outlet (12) and a pyrolysis gas outlet (13) are formed in the body (1), a material conveying mechanism is arranged in the body (1), and the pyrolysis desorption reaction kettle is vertically distributed; and the material conveying mechanism comprises a disc dryer (2) and a single-shaft double-helix stirrer (3), the disc dryer (2) for generating a transverse centrifuging effect to materials is arranged in an upper space in the pyrolysis desorption reaction kettle, and the single-shaft double-helix stirrer (3) for generating a vertical rolling effect to the materials is arranged in a lower space in the pyrolysis desorption reaction kettle. According to the treatment equipment including the pyrolysis desorption reaction kettle for the oily sludge of the offshore platform, the occupied area of the equipment is reduced, and meanwhile, the treatment efficiency of the oily sludge is improved.

The invention discloses a full-scale testing method for pressure bearing capacity and ductile-brittle transition behaviors of a gas transmission steel pipe at low temperature. The method comprises thefollowing steps: a defect is preformed in the surface of a test steel pipe, plugs are welded at two ends of the steel pipe, and the pressure bearing capacity of the defective steel pipe at low temperature is tested; the steel pipe is placed in a pipe trench, and the plugs at two ends of the steel pipe are anchored by reinforced concrete for constructing a test pipeline; measuring devices such asa strain gauge, a clip gauge and a surface temperature sensor are mounted on the steel pipe; low temperature control of the whole test steel pipe is realized by filling the body of the test steel pipewith liquid nitrogen and an alcohol cooling liquid; after the test steel pipe is filled with the low-temperature liquid, bursting pressure is reached by injecting nitrogen, and a fracture resistancecurve and ductile-brittle transition temperature of the steel pipe are analyzed and determined by acquiring information of pipe internal pressure, pipe body wall temperature, pipe body strain, openingamount of crack mouth at a preformed crack and video data. The method is economical, simple, easy to operate and safer, and can realize precise temperature control.

The invention relates to a high-temperature fused salt battery which comprises a positive pole, pasty dual electrolyte and a negative pole, wherein the positive pole is exposed in air, the pasty dualelectrolyte is prepared from fused salt and solid electrolyte powder by mixing, the fused salt is potassium carbonate and/or sodium carbonate, the solid electrolyte powder is zirconium oxide micron powder containing yttrium oxide, and the negative pole is separated from the positive pole by the pasty dual electrolyte. The high-temperature fused salt battery disclosed by the invention is a high-temperature fused salt battery which can be applied to large-scale power grid energy storage and is based on the fused salt and the solid electrolyte powder material. The pasty dual electrolyte disclosedby the invention can be easily prepared from the fused salt and the solid electrolyte powder through direct mixing, so that the pasty dual electrolyte has the advantages of higher oxygen ion conductivity, lower fluidity and good filling ability; furthermore, the short circuit and open circuit phenomena between the positive pole and the negative pole of the battery are effectively avoided, circular charge-discharge property of the battery is remarkably improved, and the processing manufacturing cost of the high-temperature fused salt battery is obviously reduced.

The invention provides a pipeline reversing valve which comprises a valve body with a tubular cavity; the valve body is provided with two or more inlet channels and one or more outlet channels, which communicate with the tubular cavity; the outlet channels can be perpendicular to the inlet channels, and also can be not perpendicular to the inlet channels; a vale element capable of alternatively sealing at least one inlet channel to keep the outlet channels open is arranged in the tubular cavity; the valve element is solid or hollow or semi-solid, and comprises a ball body, a column body or an irregular body which can alternatively seal the contact surface of any inlet channel. The pipeline reversing valve is simple and practical in structure, and is convenient to produce and manufacture; and moreover, the sealed valve body is in reciprocating motion on one plane, a motion distance is reduced, and fluctuation is not easily generated in a switching process, so that the pipeline reversing valve is especially suitable for switching pipelines in a medical pump.

The invention discloses a machine tool thermal error prediction method and system based on temperature sensitive interval segmentation. The machine tool thermal error prediction method comprises the steps: obtaining a temperature sensitive interval which is an environment temperature interval capable of causing the fluctuation of the prediction performance of a machine tool thermal error, and obtaining the temperature sensitive interval through the prediction of a residual standard deviation change trend graph; selecting temperature sensitive interval segmentation points in the temperature sensitive interval; respectively establishing corresponding machine tool thermal error prediction models on the two sides of the temperature sensitive interval segmentation points by adopting a segmentation modeling method, so as to obtain machine tool thermal error compensation segmentation prediction models; and predicting the thermal deformation of the machine tool by adopting the machine tool thermal error compensation segmented prediction model. The machine tool thermal error prediction system comprises a data acquisition system and a computer, wherein a modeling program and a prediction program are configured in the computer. According to the machine tool thermal error prediction method and system, the problem that the prediction performance of the machine tool thermal error compensation prediction model of the strong coupling temperature field fluctuates due to the influence of the environment temperature is solved, and the prediction precision and the prediction robustness of themodel are greatly improved.

The invention relates to a union melt welding machine-dedicated device for the longitudinal seams of cylindrical membrane walls, which utilizes workpiece pipes for guiding to weld the inner and the outer longitudinal seams of cylindrical membrane walls. The union melt welding machine-dedicated device comprises cylindrical membrane walls to be welded and a union melt welding machine trolley, the cylindrical membrane walls to be welded are mounted on a cylindrical membrane wall longitudinal seam-welding tooling, the trolley comprises a trolley body, a guide wheel, a driving guide wheel, a cylindrical driving wheel and a welding wire guide nozzle, the guide wheel is arranged at the center of the front end of the trolley body, the driving guide wheel and the driving wheel are symmetrically arranged on both sides of the rear end of the trolley body, and the guide wheel, the driving guide wheel and the driving wheel are formed into a three-wheeled structure; the guide wheel is a convex guide wheel, and the size of the convex part of the convex guide wheel is equal to the size of the gap between the two neighboring cylindrical membrane walls to be welded on the welding tooling. The shapes of the wheels of the union melt welding machine-dedicated device disclosed by the invention can be changed according to the welding characteristics of the longitudinal seams of cylindrical membrane walls, consequently, the traveling stability of the trolley can be enhanced in the process of welding, and the welding efficiency can be increased.

The invention discloses a metal and carbon fiber reinforced resin matrix composite laminated plate holeless riveting device. The riveting device comprises a riveting punch, a riveting female die and ashallow pit rivet. The riveting punch and the riveting female die are connected with a gas-liquid supercharging system. When in a riveting state, the axes of the riveting punch, the riveting female die and the shallow pit rivet coincide. The riveting punch presses the shallow pit rivet into the upper surface of multiple layers of overlapped metal laminated plates and carbon fiber reinforced resinmatrix composite plates. A protrusion is formed on the metal and carbon fiber reinforced resin matrix composite plate under the squeeze effect of the shallow pit rivet. The protrusion is pressed intoa concave cavity of the riveting female die. When the riveting punch returns, the shallow pit rivet stays in the concave cavity of the riveting female die. Through the metal and carbon fiber reinforced resin matrix composite laminated plate holeless riveting device, the problem of buckling deformation of a metal laminated plate is solved; the problems that laminates and carbon fibers of a carbonfiber reinforced resin matrix composite plate strip off and the carbon fibers are twined on a drill bit in the drilling process can also be avoided. Moreover, during connection, a connecting plate part cannot be pierced, and the connecting strength is improved.

The invention discloses a pocket-size split type halide leak detector. The pocket-size split type halide leak detector comprises a host, a detector body and a cable, wherein the cable is connected between the host and the detector body, the detector body comprises a feeler lever and a chamber, a probe is arranged at the front end of the feeler lever, the rear end of the feeler lever is located in the chamber, a first air inlet is formed in the rear end of the feeler lever, a second air inlet is formed in the front end of the chamber, an air outlet is formed in the rear end of the chamber, a fan is arranged in the chamber, an air duct is formed between the fan and one inner wall of the chamber, a signal line connected with the probe penetrates through the air duct and then is connected with the cable, a baffle is connected to the top of the chamber through a hinge, a spring is formed between the baffle and the feeler lever, a pulse electromagnet is arranged on the other side of the baffle, and the first air inlet and the second air inlet are located on the two sides of the baffle respectively. The pocket-size split type halide leak detector has the advantages that air can stay in the feeler lever for a period after entering the feeler lever, and the probe can accurately measure.

The invention discloses a high frequency current sensor for partial discharge detection of a cable. The high frequency current sensor includes a circular metal box having a circular cavity therein, two semi-circular magnetic cores, an insulating washer and a connector, wherein the metal box includes a first semi-circular box and a second semi-circular box which are spliced together, one end of thefirst semi-circular box is rotatably connected with one end of the second semi-circular box, and a lock catch is disposed between the other end of the first semi-circular box and the other end of thesecond semi-circular box; the two semi-circular magnetic cores are arranged in the first semi-circular box and the second semi-circular box respectively, to be disposed in the circular cavity; a metal coil is wound around one of the two semi-circular magnetic cores; the insulating washer is arranged between the metal box and the magnetic cores; the connector is connected with the metal coil; andthe first semi-circular box and the second semi-circular box are sleeved with two sliding blocks arranged in pairs respectively. At least two elastic elements are correspondingly arranged between eachsliding block and the semi-circular box corresponding to the sliding block respectively.

The invention discloses an auto door glass lifter sheet riveting device, which is provided with a riveting punch and a riveting die which are respectively connected with a press; in a riveting processing state, the riveting punch is pressed into one surface of two or more layers of stacked metal sheets, and bulges formed by an opposite metal sheet surface are pressed into a concave cavity of the riveting die; the cross section of the riveting punch is oval, and the cavity of the riveting die is matched with the shape of the cross section of the riveting punch. By adopting the technical scheme, the condition that two connected metal sheets fall off or get loose when being twisted on a plane is avoided; connection quality is easier to detect and control, a detection aim can be achieved by general detection ways, besides, riveting parameters are stable, fluctuation is not easy to cause, pollutants and radiation polluting environment and endangering human body health cannot be generated by riveting, and metal sheet part surface plating layer breakage and even welded part falling caused by welding are avoided. The technique is simpler, and the cost is lower.

The invention relates to a liquid alkali decomposition method of high-grade mixed rare earth ore concentrate. The liquid alkali decomposition method of the high-grade mixed rare earth ore concentrate is characterized by comprising the steps: mixing the high-grade mixed rare earth ore concentrate with REO being more than 60 percent by weight and a sodium hydroxide with the concentration being more than 60 percent by weight and performing reaction on the mixed slurry at 150 to 160 DEG C for 0.2 to 1 hour, wherein the weight ratio of the mixed rare earth ore concentrate to the sodium hydroxide is 1:(3.5-7.5); after reaction is finished, performing hot filtration at the temperature being more than 60 DEG C and washing an alkali cake obtained by filtration with water until the pH value is 7; and dissolving the alkali cake which is washed until the pH value is 7 with hydrochloric acid of 6 to 10 mol/L and controlling the pH value to be 4 to 5 to obtain a pure rare earth chloride solution. The liquid alkali decomposition method of the high-grade mixed rare earth ore concentrate has the advantages that high-concentration liquid alkali reaction is conducted under the condition of high alkali-ore ratio, so the system is high in flowability, small in alkali concentration change, high in reaction temperature, insusceptible to fluctuation and short in reaction time, continuous production is realized easily, the problem about continuous industrial production of the liquid alkali decomposition process of the high-grade mixed rare earth ore concentrate is solved, and continuous production of the alkali decomposition process is realized.

The invention relates to a traditional Chinese medicine composition for promoting intestine peristalsis to expel flatus to prevent intestinal adhesion and a preparation method thereof. The traditionalChinese medicine composition contains the following components in parts by weight: 6-10 parts of pericarpium zanthoxyli, 10-15 parts of rhizoma zingiberis, 6-10 parts of ginseng and 20-30 parts of maltose. The preparation method comprises the following steps: mixing all components, then uniformly mixing with a matrix paste to obtain a paste; uniformly coating a non-woven fabric of a backing layerwith the paste, and then laminating, thus obtaining emplastrum. The traditional Chinese medicine composition provided by the invention is prepared by adopting pure traditional Chinese medicine, is free from injection, free from pain, good in absorption, convenient to use, extract in curative effect, rapid to take effect and economical and practical, can recover the intestinal function of a patient as soon as possible, promote intestine peristalsis and intestinal flatus expelling and prevent the occurrence of intestinal adhesion, and can overcome shortages of existing clinical treatment technology, and further can enable patients to recover the physical power as soon as possible, promote healing of the wound, reduce length of stay, relieve the family financial burden, bring convenience andgreatly facilitate the doctor and the patient.

The invention discloses a piston-type momentum experiment instrument with a teaching effect flow digital-display function. The experiment instrument comprises a constant-pressure water supply tank, a water collection tank, a momentum tube, a liquid-gas conversion pressure measuring cylinder, a pressure difference sensor, a microcomputer digital display meter, and a self-circulating water supply device. The side wall of the constant-pressure water supply tank is provided with an outlet, and the outlet is a nozzle. The water collection tank is connected with the outlet of the constant-pressure water supply tank. The momentum tube is used for measuring the jet flow momentum force at the outlet of the constant-pressure water supply tank, and is fixed in the water collection tank. The liquid-gas conversion pressure measuring cylinder is arranged in a stable-water working area inside the constant-pressure water supply tank, and the top of the liquid-gas conversion pressure measuring cylinder is provided with a communicated positioning tube which is disposed in the central-axis horizontal plane of the outlet. The microcomputer digital display meter is used for converting a pressure signal detected by the pressure difference sensor into flow. The experiment instrument of the invention can reset automatically, can eliminate the error of air compression, can be zeroed in real time, is high in precision, can conveniently, digitally and accurately measure two basic physical quantities of a fluid mechanics momentum law experiment instrument, namely, jet flow rate and jet flow momentum, and has a very good teaching effect.

The invention discloses a gas mixer. The gas mixer comprises a first hollow sphere and a second hollow sphere. A first gas inlet pipe and at least one second gas inlet pipe are arranged on one side of the first hollow sphere. The tail end of the first gas inlet pipe is positioned at a gas outlet of the first hollow sphere; the gas outlet of the first hollow sphere is connected with a gas inlet of the second hollow sphere through a pipe; a certain included angle is formed between the gas outlet direction of the second hollow sphere and the gas inlet direction of the second hollow sphere. The gas mixer disclosed by the invention can achieve the effect of rapidly and completely mixing gas, ensures that the concentration of the gas mixture is not liable to fluctuate and the quality of the gas mixture is stable and reliable, and effectively improves and controls the growth quality of semiconductors.

The invention discloses a slurry outlet device for fish ball machines with adjustable forming pressure. The device includes a forming pedestal and forming pistons; the forming pedestal is provided with at least two forming sleeves and material inlets; each forming sleeve is provided with one forming piston; the material inlets are connected to a material feeding device; each forming sleeve is provided with an adjusting mechanism; the adjusting mechanisms are provided with pressure adjusting rings with one ends stretching into the forming sleeves; the adjusting mechanisms adjust the telescopinglength of the pressure adjusting rings in the forming sleeves, so that the sizes of the openings of the material inlets can be adjusted and controlled; and the forming pistons are coaxially sleeved in the pressure adjusting rings to perform piston motion so as to extrude downward to convey fish ball slurry. Each adjusting mechanism can independently adjust the sizes of material feeding ports in the forming sleeves; through the coordination and cooperation of the forming pistons capable of moving up and down through adjusting, the adjustment of feeding and forming pressure can be realized, forming pressure can be guaranteed to be stable and not easy to fluctuate; and formed fish balls are round in shape and have better taste and look.

The invention provides a pressing type hemostasis device with selectivity and controllability for lower limbs of a human body, and belongs to the technical field of emergency hemostasis of medical treatment, pre-hospital emergency treatment, traffic injury and war injury. According the device, a first limiting sleeve is sleeved and fixed on a supporting rod, a second limiting sleeve is fixed on the first limiting sleeve, an included angle is formed between the second limiting sleeve and the first limiting sleeve, a limiting rod penetrates through the second limiting sleeve, two ends of the limiting rod are led out, one end of the limiting rod is provided with a connecting block, a middle part of an adjusting rod is hinged at the connecting block, side surfaces of two ends of the adjustingrod are provided with threaded holes, an adjusting screw rod is screwed in the threaded hole at one end of the adjusting rod, one end of the adjusting screw rod abuts against a side wall at one end ofthe limiting rod, a pressing rod is screwed in the threaded hole at the other end of the adjusting rod, and one end of the pressing rod is provided with a blood vessel pressing head. The device can selectively and controllably reduce bleeding of blood vessels, and solves problems of unreasonable hemostasis mode and the like of an existing tourniquet.

The invention discloses the technology of ultra-large type vertical axis wind turbine units. A turbine is an ultra-large type unit of 10MW level or the level of power above 10MW. From the perspective of structural mechanics, two-blade single arm Aerogenerator X design of the Arup company in the England is changed into double-triangle connecting design of two-blade double arms, blade stress and deformation generated by blade gravity and wind thrust can be overcome, the special high rigid structure is achieved, the structural strength is improved sufficiently to increase cut-out wind speed, and the generating capacity is increased; secondarily, through the increased complementary capacity of a Savonius turbine, starting torque can be increased, and the driving torque is made to be more stable, so that the unit output power is further increased. The wind turbine becomes the vertical axis wind turbine unit integrated with the latest technology at home and abroad, the maximum output power and the quite high industrialization implementation degree, and the double-arm double-triangle fan blade structure is also suitable for kW level wind driven generators.

The invention discloses a novel floating bridge, and belongs to the technical field of roads and bridges. Floating bridge units are connected and assembled to form the floating bridge. Landing portions are arranged at one ends, adjacent to a shore side, of the floating bridge units. The lower surfaces of the landing portions are oblique surfaces, and one ends of the landing portions are fixed on the shore side through pins; the floating bridge units are connected with each other through a plurality of protruding connecting parts, and the floating bridge units are connected with the landing portions by the protruding connecting parts; connecting holes are formed in the ports of the connecting parts, and screws are arranged in the connecting holes to connect two floating bridge units.The floating bridge is used temporarily in the civil and military fields and has the advantages of being simple in structure, rapid to construct, not fluctuant in gravity center and stable in walking.