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42results about How to "Guaranteed margin" patented technology
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Machining process of middle-long thin-wall blades
ActiveCN103008741AReduce cumulative errorReduce processing stress deformationMilling equipment detailsEngineeringMachining process
The invention discloses a machining process of middle-long thin-wall blades, which belongs to the technical field of machining of blades. The machining process is implemented by a detailed process of integrated rough machining and integrated fine machining, wherein the integrated rough machining comprise the specific steps of rough machining of each surface of a blade tip, each surface of a blade root and a molded surface of a steam passage; and the integrated fine machining comprises the specific steps: semifinishing of each surface of the blade tip and each surface of the blade root, fine machining of each surface of the blade tip, each surface of the blade root and each residue, semifinishing of the steam passage and fine machining of the steam passage. According to the machining process of the middle-long thin-wall blades, the operation is simple and convenient, the use is convenient and fast, the cost is low, the machining efficiency is high, and the operation is easy and labor-saving; and the deformation of the middle-long thin-wall blades is controlled within 0 to 0.8mm, the normal machining of a subsequent mold correction process is facilitated, and the machining of each blade is finished once.
Owner:SICHUAN MIANZHU XINKUN MACHINERY MAKING
Circuit for eliminating noise of switching power supply
InactiveCN102044961ACancel noiseImprove efficiencyPower conversion systemsConnection typeCapacitance
Owner:SHENZHEN HUNTKEY ELECTRIC
Control device for hybrid vehicle
ActiveCN101687505ADrive inhibitionDriving force inhibitionElectrical controlInternal combustion piston enginesElectricityInternal combustion engine
A control device for a hybrid vehicle having an internal combustion engine, a generator motor, an electricity storage device, and driving force assist means. The control device has switch means that appropriately selects from and switches between travel ranges including at least a normal travel range and a charge priority range in which charging to the electricity storage device is prioritized. The control device also has threshold value increasing means that, when the charge priority range is selected by the selection means, increases a specific determination threshold value to a level higherthan that when the normal travel range is selected by the switch means.
Owner:HONDA MOTOR CO LTD
Long bit width time sequence accumulation multiplying unit
ActiveCN106528046ALimit the maximum operating clock frequencyLess cumulation timesDigital data processing detailsBinary multiplierData operations
The invention provides a long bit width time sequence accumulation multiplying unit, which comprises a clock, a data operation module and a carry register, wherein the data operation module carries out operation on data to finish various types of work; a full adder is arranged in the data operation module; the full adder segments products obtained by accumulation, and multiplicands into different intervals according to bit width, the bit widths of full adders in different intervals are subjected to addition calculation when the data operation module enters an accumulation working state, and carry information is stored in the carry register; and when a next clock edge comes, the product of the shifted multiplicand and carry data of a previous level is accumulated to generate a new product and carry data, the new product and carry data can be stored in the carry register, and circulation is carried out in the above way until data in a multiplier is completely shifted. The data bit width calculated by the multiplying unit can be infinitely increased so as to get rid of limitation, which is caused by the multiplication data bit width, for the maximum work clock frequency of the multiplying unit, and the multiplying unit can stably work under extremely high clock frequency.
Owner:SHANGHAI INTEGRATED CIRCUIT RES & DEV CENT +1
Screw drive type double-power source changeover switch
ActiveCN105185666AImprove reliabilitySimple structureProtective switch operating/release mechanismsElectric machineDual purpose
The invention relates to a double-power source changeover switch, in particular, a screw drive type double-power source changeover switch. According to the technical schemes of the invention, the screw drive type double-power source changeover switch is characterized in that a drive switching mechanism comprises a motor which is arranged on a base and is located between two circuit breakers, an incomplete gear which is in linkage connection with the output shaft of the motor, as well as a first gear and a second gear which are located at two sides of the incomplete gear and are engaged with the incomplete gear; the first gear is connected with a first screw pair; a push handle is in linkage matching with the handle of one circuit breaker so as to drive the circuit breaker to be switched on or switched off; and a second nut on a second screw pair is provided with a second push arm. With the above technical schemes adopted, the screw drive type double-power source changeover switch provided by the invention has the advantages of simple structure, low cost and high reliability and dual-purpose performance. With the screw drive type double-power source changeover switch adopted, switching between a lock state and an unlock state can be carried out.
Owner:DELIXI ELECTRIC
Array substrate, preparation method of array substrate and display panel
The invention discloses an array substrate, a preparation method of the array substrate and a display panel. The array substrate comprises a plurality of spacer pads for supporting spacers, wherein the supporting end of each spacer pad is provided with at least one concave portion. The array substrate is applied to the display panel, the array substrate is connected with a color film substrate, and the spacer pads correspond to the spacers in a one-to-one mode and are used for supporting the spacers; the supporting end of each spacer pad arranged on the array substrate is provided with one or more concave portions, and the size of the supporting end of each spacer pad can be increased, namely the spacers arranged on the color film substrate can move in a larger range on the spacer pads but the contact area of each spacer and the corresponding spacer pad cannot be increased; meanwhile, by means of the arrangement of the concave portions, friction force between the spacers and the spacer pads can be increased, the spacers can be prevented from deviating when the display panel bears external pressure, and the light leaking phenomenon of the display panel is reduced.
Owner:BOE TECH GRP CO LTD +1
Electrocardiosignal denoising method based on improved EMD (Empirical mode decomposition) and threshold method fusion
ActiveCN110680308ASolve the problem of modal aliasingHigh frequency resolutionDiagnostic recording/measuringSensorsSignal waveEcg signal
The invention provides an electrocardiosignal denoising method based on improved EMD (Empirical Mode Decomposition) and threshold method fusion, and belongs to the technical field of signal wave filtering. The mode mixing problem is solved by adding white noise with different weight coefficients. The end point problem is solved by a method of a least squares support vector machine. Signal upper and lower envelope lines are constructed by a conformal spline interpolation method; and cubic spline interpolation with second-order approximation accuracy, few segments and small calculation quantityis constructed by a conformal segmentation method. The method can be used for inhibiting the envelope fitting overshoot / undershoot problem; IMF (Intrinsic Mode Function) component sieve termination criterion is provided by the decomposed IMF orthogonality and energy properties; the orthogonality and completeness of the EMD are ensured; the amount of noise contained in the sieved IMF signals is judged through a mutual information principle, whether the filtering processing is needed or not is determined, and the high speed of an EMD algorithm is accelerated; a threshold function is improved;the threshold function combines with the advantages of soft-hard thresholds; and the filtering processing is performed on IMF containing the noise.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY +1
Storage device and information re-recording method
InactiveCN101889312AReduce the number of cyclesShorten the timeDigital storagePotential differenceEngineering
Provided is a storage device which can reduce the number of cycles required for a verify process upon a multi-value recording. The initial value of the potential difference VGS between a gate and a source of a switching transistor upon a verify process is varied in accordance with the resistance value level of the multi-value information. When the write side performs a 3-value recording, if '01' is the information, the initial value VGS01 is set to be smaller than VGS = 1.7V corresponding to the target resistance value level '01', and if '00' is the information, a value is set to be lower than VGS = 2.2 V corresponding to the target resistance value level '00' and higher than the aforementioned VGS01. This can reduce the number of cycles required for the verify process.
Owner:SONY CORP
Water treatment sterilization method by ultraviolet catalysis hydrogen peroxide matched with chlorine/chloramine
InactiveCN102167464AEffective inactivationEasy to controlWater/sewage treatment by irradiationMultistage water/sewage treatmentChloramine BChemical safety
The invention relates to a water treatment sterilization method by ultraviolet catalysis hydrogen peroxide matched with chlorine / chloramine, belonging to the technical field of the sterilization in water treatment. The water treatment method is used for sterilizing the water by the chlorine / chloramine based on ultraviolet and hydrogen peroxide photocatalysis sterilization. The method comprises the steps of: adding 0.05-0.20mmol / L of hydrogen peroxide during ultraviolet irradiation, and feeding 0.10-0.20mg / L of chlorine into the water which is irradiated by the ultraviolet to sterilize; or adding 0.05-0.20mmol / L of hydrogen peroxide during the ultraviolet irradiation, and feeding 0.20-0.40mg / L of chloramine into the water which is irradiated by the ultraviolet to sterilize. The method is used for producing hydroxyl radical which is high in oxidability by the ultraviolet catalysis hydrogen peroxide, the deactivation effect to chlorine and ultraviolet-resistant sterilized microorganism is greatly improved due to the synergistic sterilization effect of the hydroxyl radical and the chlorine / chloramine, so that the biological safety and the chemical safety of the water can be guaranteed, and the method can be widely used for sterilizing and purifying drinking water.
Owner:TONGJI UNIV
Ship water inlet passage and manufacturing and installation method
ActiveCN108609147AShorten the construction periodAvoid bulk workVessel designingPropulsive elementsMarine engineeringWater flow
The invention discloses a ship water inlet passage and manufacturing and an installation method. The ship inlet passage comprises a water inlet passage first area assembly, a water inlet passage second area assembly, a bent assembly in a curved cylindrical shape, a nozzle assembly which are connected in the stream direction in sequence; and further comprises a tail shaft protection pipe parallel to the water level and with one end penetrating through the water inlet passage second area assembly and an anti-singing edge used for connecting the tail shaft protection pipe and the top of the innersurface of the bent assembly. The advantage of bulk loading of the water inlet passenger structure on a berth is preserved, and meanwhile, the condition of a large number of parts being in bulk on the berth is avoided.
Owner:CSSC HUANGPU WENCHONG SHIPBUILDING COMPANY
Field weakening control method of asynchronous motor based on bandgap variable step size method
ActiveCN104135203AGuaranteed control effectAvoid the effects of controlElectronic commutation motor controlVector control systemsVoltage vectorThree-phase
The invention discloses a field weakening control method of an asynchronous motor based on a bandgap variable step size method. The method comprises the steps of obtaining particular value coefficients P1 and P2 according to a specific application condition and a test condition to determine particular values Umax and Umin of a three-phase voltage resultant vector us of the asynchronous motor, then determining bandgap width as shown in the specification, determining initial step size as shown in the specification, determining restraint coefficients a1, a2, b1 and b2 according to a practical application condition and the test condition, determining a variable step size coefficient beta and a direction coefficient alpha according to direct current busbar voltage and control voltage vectors, determining a set value of exciting current of the asynchronous motor, and finally resetting an exciting current component according to an equation as shown in the specification. The method avoids an influence of parameters of the motor on control, and is simple in algorithm and quick in field weakening response; the algorithm achieves smooth transition within a full-speed range of the asynchronous motor; and a field weakening control requirement of the asynchronous motor is met.
Owner:中国东方电气集团有限公司
Deformation rectifying method for plate carburizing and quenching gears and special tool for deformation rectifying method
ActiveCN105525252AReduce cooling rateCompensation for smaller size defectsSolid state diffusion coatingFurnace typesCarburizingThermal treatment
The invention relates to a deformation rectifying method for plate carburizing and quenching gears, and belongs to the technical field of metal thermal treatment. The method comprises steps of measuring and selecting, pre-moving stress, preparing a tool, mounting a workpiece, re-quenching, tempering and the like. By adopting the deformation rectifying method, the large end of a common normal line of a to-be-rectified gear faces downwards and is in direct contact with a tray higher than the gear, so that the cooling speed of the part of the gear can be reduced, thermal treatment expansion of the part is relatively small, and the phenomena of a relatively shallow carburized layer and a gear root step caused by too great follow-up milling amount due to secondary quenching are avoided; and meanwhile, the cooling speed for the upper end of the gear is relatively high, and the thermal treatment expansion is greater, so that the defect of a relatively small size of the common normal line after primary carburizing and quenching is compensated.
Owner:CRRC QISHUYAN INSTITUTE CO LTD
Predictive dead time generating circuit
ActiveCN109787466AGuaranteed marginConvenient lengthEfficient power electronics conversionDc-dc conversionDead timeComputer module
The invention discloses a predictive dead time generating circuit, and belongs to the technical field of electronic circuits. A dead time detection module is used for detecting the dead time between the power-off of an upper power tube and the power-on of a lower power tube as well as the dead time between the power-off of the lower power tube and the power-on of the upper power tube. A first detection signal and a second detection signal are generated according to whether the detected dead time reaches an optimal value or not, and a logical control module is used for changing the output of adelay module according to the judgement result of the dead time detection module in order to change the dead time between an upper power tube driving signal and a lower power tube driving signal. Through adoption of the predictive dead time generating circuit, the dead time can be adjusted to ensure the dead time margin and optimize the length of the dead time, so that the power consumption is lowered.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Control device for hybrid vehicle
ActiveCN102673375ADrive inhibitionDriving force inhibitionElectrical controlInternal combustion piston enginesInternal combustion engineHybrid vehicle
Owner:HONDA MOTOR CO LTD
Swarm type carrier loader cooperative carrying control system and method
PendingCN110989618AImprove transportation efficiencyHigh positioning accuracyPosition/course control in two dimensionsVehiclesControl systemSimulation
The invention relates to a swarm type carrier loader cooperative carrying control system and method. The system comprises at least two binocular camera devices, a plurality of radar devices, a GPS positioning device, a weighing sensor and a central processing module. When multiple carrier loaders carry out swarm type cooperative transportation, the method controls the operation of the carrier loaders according to the following steps of (1) main carrier parking position judgment, (2) main carrier parking execution, (3) slave carrier parking execution, (4) driving rotating speed judgment and execution and (5) scene judgment and tracing. The system and method are conducive to swarm type cooperative transportation of large cargos.
Owner:FUJIAN UNIV OF TECH
Totally-laparoscopic circular stapler nail anvil embedding device and manufacturing method
InactiveCN104490439AGood curative effectGuaranteed marginSurgical staplesPERITONEOSCOPEPurse string suture
A totally-laparoscopic circular stapler nail anvil embedding device is characterized by comprising a metal bar (1) and a nail anvil (4), wherein one end of the metal bar (1) is a connecting end (2); the other end of the metal bar (1) is a guiding end (3); the head end of the nail anvil (4) is shaped like a spherical umbrella; the other end of the nail anvil (4) is a center rod (5); the tail end of the center rod (5) is connected with a puncture head (6); and the connecting end (2) of the metal bar (1) is connected with the puncture head (6). After the adoption of a nail anvil embedding method provided by the invention, a circular stapler nail anvil can directly penetrate through the side wall of an esophagus without the need of purse string suture, so that the cutting position of the esophagus is heightened, which can guarantee the resection margin of cancer at the joint of the esophagus and a stomach and improve the effect of radical treatment of cancer. Meanwhile the method avoids the phenomenon that the wall of the esophagus crimps due to purse string tightening, the nail anvil is closer to a nail bin, the nailing is tighter, the probability of incomplete anastomosis is reduced, and thus the probability of laparoscopic esophagus-jejunum anastomotic leakage complications can be reduced remarkably.
Owner:THE AFFILIATED DRUM TOWER HOSPITAL MEDICAL SCHOOL OF NANJING UNIV
System for achieving parallel operation of double generators of unmanned aerial vehicle and adjustment test method of system
InactiveCN105720603AGuaranteed marginAchieve multitasking capabilitiesElectrical testingSingle network parallel feeding arrangementsDynamoEmbedded system
The invention discloses a system for realizing parallel operation of two generators of an unmanned aerial vehicle and its adjustment and testing method, including a left generator, a right generator, a left generator controller, a right generator controller, a left grid contactor, The right grid contactor and the central bus bar, the left generator is connected with the left generator controller through the signal line, the right generator is connected with the right generator controller through the signal line, and the left generator controller and the right generator controller are connected through The signal line is connected, the left generator controller is connected with the left grid contactor through the signal line, the right generator controller is connected with the right grid contactor through the signal line, the left generator is connected with the left grid contactor through wires, the right The generator is connected to the right grid contactor through wires, and both the left grid contactor and the right grid contactor are connected to the central bus bar through wires. Equilibrium control is achieved by adjusting the test method. The invention can effectively utilize the power supply of the unmanned aerial vehicle, reduce the weight of the aircraft, save the installation space, and increase the output power of the power supply.
Owner:CHENGDU AIRCRAFT INDUSTRY GROUP
Field Weakening Control Method for Asynchronous Motor Based on Bandgap Variable Step Size Method
ActiveCN104135203BGuaranteed control effectAvoid the effects of controlElectronic commutation motor controlVector control systemsVoltage vectorBusbar
The invention discloses a field weakening control method of an asynchronous motor based on a bandgap variable step size method. The method comprises the steps of obtaining particular value coefficients P1 and P2 according to a specific application condition and a test condition to determine particular values Umax and Umin of a three-phase voltage resultant vector us of the asynchronous motor, then determining bandgap width as shown in the specification, determining initial step size as shown in the specification, determining restraint coefficients a1, a2, b1 and b2 according to a practical application condition and the test condition, determining a variable step size coefficient beta and a direction coefficient alpha according to direct current busbar voltage and control voltage vectors, determining a set value of exciting current of the asynchronous motor, and finally resetting an exciting current component according to an equation as shown in the specification. The method avoids an influence of parameters of the motor on control, and is simple in algorithm and quick in field weakening response; the algorithm achieves smooth transition within a full-speed range of the asynchronous motor; and a field weakening control requirement of the asynchronous motor is met.
Owner:中国东方电气集团有限公司
Fracturing truck hydraulic system and control method thereof
PendingCN113124002ASmooth pressure fluctuationsReduce total openingFluid-pressure actuator testingAccumulator installationsHydraulic motorTruck
The invention relates to a fracturing truck hydraulic system and a control method thereof. The system comprises an engine, an oil pump, a hydraulic motor and at least one energy accumulator, the engine is in driving connection with the oil pump, the oil pump is connected with the hydraulic motor through a high-pressure oil way and a low-pressure oil way, the hydraulic motor is suitable for being in driving connection with a fracturing pump, and the energy accumulators are connected into the high-pressure oil way between the oil pump and the hydraulic motor. According to the technical scheme, the operation stability of the fracturing truck hydraulic system can be guaranteed.
Owner:SANY PETROLEUM INTELLIGENT EQUIP CO LTD
Control method for chlorine-resistant bacteria in drinking water
InactiveCN110143708AGuaranteed marginKeep margin up to standardWater treatment parameter controlWater/sewage treatment by irradiationPeroxydisulfateChlorine dioxide
The invention belongs to the technical field of disinfection of drinking water, and relates to a control method for chlorine-resistant bacteria in drinking water. The control method comprises the following main steps: (1) controlling a pH value of a bacterial liquid sample to be 6.5 to 8.5; (2) adding a peroxymonosulfate, a peroxydisulfate or a mixed chemical of the monosulfate and the peroxodisulfate according to a ratio of 1: 1 into the sample; (3) carrying out treatment with a medium-pressure ultraviolet lamp tube commonly used in actual water treatment; and (4) adding sodium hypochlorite or chlorine dioxide as a disinfectant into outgoing water obtained by treatment, wherein the time of disinfection and the remaining amount of a disinfectant meet the requirements of the Sanitary Standard for Drinking Water (GB5749-2006). The method provided by the invention adopts a combined disinfection form of a persulfate, UV and sodium hypochlorite / chlorine dioxide to form advanced oxidation, can effectively cope with the problem of propagation of the chlorine-resistant bacteria in source water, can maintain the remaining amount of the disinfectant in pipe network water up to standards, andcan comprehensively guarantee the microbiological safety of the drinking water.
Owner:SHENZHEN WATER GRP CO LTD
LEO-to-HEO multi-orbit satellite measurement and control system and method
ActiveCN111679300AImprove isolationGuaranteed low-noise operationSatellite radio beaconingHigh level techniquesTransceiverRemote control
The invention provides an LEO-to-HEO multi-orbit satellite measurement and control system and method. The LEO-to-HEO multi-orbit satellite measurement and control system comprises an orbit measurementmodule, a first telemetry module, a second telemetry module and a remote control module. The orbit measurement module is configured in a mode of combining USB (Universal Serial Bus) orbit measurementwith GNSS (Global Navigation Satellite System) orbit measurement. The remote control module is configured to realize global beam coverage by combining two pairs of measurement and control transceiverantennas and receive remote control signals in all track operation phases. The first telemetry module is configured to realize global beam coverage by combining the two pairs of measurement and control transceiver antennas and transmit low-power telemetry signals in the LEO orbital phase and the early orbit transfer phase. The second telemetry module is configured to achieve hemispherical beam coverage in a single-antenna transmitting mode, achieve time-sharing global beam coverage through switching of two measurement and control transmitting antennas and transmit high-power telemetry signalsin the later orbit transfer phase and the HEO orbital phase.
Owner:INNOVATION ACAD FOR MICROSATELLITES OF CAS +1
Artificial-intelligence medical-image-aided diagnosis equipment
PendingCN110547936AReasonable structural designBig angleOperating tablesElectric machineryHinge angle
The invention discloses artificial-intelligence medical-image-aided diagnosis equipment, and belongs to the technical field of medical-image-aided diagnosis equipment. In the artificial-intelligence medical-image-aided diagnosis equipment, an output end of a motor is fixedly connected with a screw; an outer wall of the screw is in threaded connection with a threaded tube; a slide rail is fixedly arranged at the bottom of an inner cavity of a protective box; a slide rest, which fits with the slide rail, is fixedly arranged at the bottom of the threaded tube; a first hinge block is fixedly arranged at the top of the threaded tube; a support rod is hinged with the first hinge block by pin-shaft movement; a support airbag is fixedly arranged at the bottom of a first support plate; the bottom of the support airbag is fixed at the top of the protective box; an air pump is fixedly arranged on the right side wall of the protective box; a guiding slide rack, which is hinged with the top of thesupport rod in a movable way by a pin shaft, is assembled at the bottom of a second support plate in a movable way so as to allow adjustment of the angle between a patient's body and the patient's head; and moreover, separate stepless adjustment on the patient's body and the patient's head is also allowed, so that application range of the artificial-intelligence medical-image-aided diagnosis equipment is relatively wide.
Owner:苏州欢益医疗科技有限公司
Control apparatus for hybrid vehicle
ActiveCN102673377ADrive inhibitionDriving force inhibitionElectrical controlInternal combustion piston enginesInternal combustion engineHybrid vehicle
Owner:HONDA MOTOR CO LTD
A Predictive Dead Time Generation Circuit
ActiveCN109787466BGuaranteed marginConvenient lengthEfficient power electronics conversionDc-dc conversionControl engineeringHemt circuits
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Memory device, memory system and programming operation method
PendingCN114882928AReduce the number of verification operationsGuaranteed marginRead-only memoriesDigital storageComputer architectureMemory cell
The invention discloses a memory device, a memory system and a program operation method. The memory device includes: a memory array having a plurality of memory blocks, each memory block being arranged to have a plurality of memory sub-blocks; each storage sub-block at least comprises one storage unit; and a control circuit coupled to the memory array, the control circuit is configured to determine a verify cycle count for performing a verify operation by programming memory cells in a first memory sub-block in a first memory block of the plurality of memory blocks to a target program data state during a non-last pass program while performing a multi-pass program on the first memory block; when the storage units in the other storage sub-blocks in the first storage block are programmed to the target programming data state by adopting the same programming and verification conditions for the first storage sub-block, at least the last verification operation corresponding to the verification cycle count is not executed in the non-last programming of the storage units in the other storage sub-blocks.
Owner:YANGTZE MEMORY TECH CO LTD
Light receiving and outputting control equipment
InactiveCN102479524AImproved amplitude characteristicsImproved tracking servo characteristicsRecord information storageOptical beam guiding meansLaser beam guideEngineering
The invention discloses light receiving and outputting control equipment. In an optical pick-up device of a photoelectric detector which is configured to guide laser beams emitted from a laser source to an objective lens, converge the laser beams with the objective lens to irradiate onto a magnetic disk, and guide the laser beams reflected and returned by the magnetic disk to a light receiving area consisting of a plurality of sections, the photoelectric detector is provided with each amplifier which corresponds to each section of the light receiving area, each output terminal for outputting corresponding to each light receiving and outputting from each section of the photoelectric detector device through each amplifier, and an output setting circuit; the output setting circuit is used for setting each light receiving and outputting from each output terminal by changing the gain of each amplifier or attenuating the input or output of each amplifier with an attenuator; and the output setting circuit is used for calibrating each light receiving and outputting from each output terminal according to an output difference generated in each light receiving and outputting from each output terminal.
Owner:DALIAN ZHAOYANG SOFTWARE TECH
ECG signal denoising method based on fusion of improved emd and threshold method
ActiveCN110680308BSolve the problem of modal aliasingHigh frequency resolutionDiagnostic recording/measuringSensorsEcg signalAlgorithm
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY +1
A method for controlling an electric water heater and the water heater
Owner:GUILIN UNIV OF AEROSPACE TECH
Method for manufacturing defect simulation test block for polyethylene pipe hot-melt welded joint
ActiveCN113125229AEasy to prefabConvenient quantitative measurementPreparing sample for investigationPrefabricationPolyethylene
The invention discloses a method for manufacturing a defect simulation test block for a polyethylene pipe hot-melt welded joint, which comprises the following steps of: 1, selecting a defect-free polyethylene pipe to manufacture a defect prefabricated pipe and a butt joint pipe, and prefabricating defects at one end of the defect prefabricated pipe according to the defect type of the hot-melt welded joint to form a defect distribution end, wherein the prefabricated defect is in a standard shape; 2, enabling the defect distribution end of the defect prefabricated pipe and the butt joint pipe to be subjected to hot melting welding, and forming a hot-melt welded joint; and axially cutting the defect prefabricated pipe and the butt-joint pipe which are subjected to hot-melt welding to form the polyethylene pipe hot-melt welded joint defect simulation test block. In the defect prefabrication process, the defect character is standardized into a regular shape as the standard defect form for detection technology verification and scientific research, and prefabrication and quantitative measurement of the defect are facilitated. By changing the shape of the defect, the manufactured defect can be closer to the actual shape on site, and simulation and comparison of the actual defect are more convenient.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Brake switch adjustment method
Owner:TOSHIBA ELEVATOR KK
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