Infrared thermal image nondestructive testing method and device based on double-pulse current thermal excitation

In view of various orientations of defects in a component, single pulse current thermal excitation is difficult to effectively generate an electromagnetic heating effect on defects in the same direction or similar direction as current, and a leak detection phenomenon is easily caused. Therefore, according to the infrared thermal image nondestructive testing method and device based on double-pulse current thermal excitation, two paths of pulse current are emitted at the same time, and thermal excitation is formed in two different directions of a metal test piece; the distribution of a temperature field on the surface of the metal test piece is obtained through real-time infrared thermal imaging so as to detect the defects of the test piece. The double pulse current generators are adopted to simultaneously emit two paths of pulse current, thermal excitation is respectively formed in two different directions of the test piece, the problem that one-way thermal excitation is insensitive to defects ...

Fresh-keeping storage device with nitrogen generation device

The invention relates to the technical field of nitrogen preservation, and discloses a preservation storage device with a nitrogen making device, the preservation storage device comprises a storage box, one side of the storage box is fixedly connected with a protective shell, and the protective shell is fixedly connected with a vibration assembly; the vibration assembly is fixedly connected to the side wall of the storage assembly, the nitrogen generation assembly is fixedly connected to the outer wall of the storage box, the trigger assembly is fixedly connected to the side wall of a gas storage pipe in the vibration assembly, and the moisturizing assembly is fixedly connected to the upper wall of the storage box. Air entering the storage box can be replaced out of the storage box when the door is opened every time, a high-concentration nitrogen environment is kept in the storage box, it is guaranteed that food in the storage box is not oxidized and deteriorated, meanwhile, the moisture ...

Single-phase earth fault positioning method

The invention relates to the technical field of distribution network fault positioning, and discloses a single-phase earth fault positioning method, which comprises the following steps: S1, generating single-phase earth fault waveform data as a training set and a test set based on Simulink simulation; s2, acquiring field fault recording data as a verification set; s3, unifying the sampling rate of the training set, the test set and the verification set; s4, designing a neural network; and S5, inputting the verification set into the trained neural network, and judging the relationship between the position of the fault recording device and the fault position, so that the fault position can be positioned according to the line topological graph. According to the method, the capability of automatic feature extraction of deep learning is utilized, the problems of insufficient fault information, insufficient universality and low accuracy of feature extraction by using a manual feature extractor ...

Boiler tail gas purification system and electrochemical waste wet carbon sequestration method thereof

The invention provides a boiler tail gas purification system. The boiler tail gas purification system comprises a coal-fired boiler, and a coal economizer, an SCR denitration reaction system, an air preheater, an electrostatic dust collector, a desulfurization tower and a carbon sequestration system are sequentially arranged on a flue of the coal-fired boiler; flue gas generated by a coal-fired power plant boiler passes through an SCR denitration reaction system, an electrostatic dust collector and a desulfurizing tower to obtain carbon-containing flue gas after denitration, desulfurization and dust removal, and the carbon-containing flue gas enters a calcium-based solid waste wet-process carbon sequestration system based on electrochemistry promotion through a flue to capture CO2. The invention provides a boiler tail gas purification system. The system aims at solving the problem that calcium ion release and CO2 absorption and fixation cannot be coupled in the calcium-based solid waste ...

Water dispenser with nitrogen making device

The invention relates to the technical field of water dispensers, in particular to a water dispenser with a nitrogen making device, which comprises a drinking water tank, a bucket is arranged at the top of the drinking water tank, a notch is formed in an inner cavity of the drinking water tank, a water storage tank is mounted on the inner side of the notch, and a smart seat extending out of the top of the drinking water tank is mounted at the top of the water storage tank. Nitrogen in the nitrogen assembly is output into the water storage tank, and when the air pressure in the water storage tank and the air pressure in the water barrel are different, the nitrogen in the water storage tank can enter the water barrel through the smart head till the water storage tank and the smart head are kept in a negative pressure state. Therefore, pollution of microorganisms and micro-particles in the air to the inside of the water bucket is reduced, water source quality in the water bucket is improved ...

Rope coiling device capable of rapidly winding steel wire rope

The utility model discloses a rope coiling device capable of rapidly winding a steel wire rope. Bottom plate, a sliding groove is formed in the upper end of the bottom plate. A moving device is arranged in the sliding groove; a first vertical plate is arranged at the upper end of the moving device; a second vertical plate is fixed to the upper end of the bottom plate, the first vertical plate corresponds to the second vertical plate, a bearing is installed on the first vertical plate, a transverse rod is installed in the bearing, a connecting rod is arranged on the second vertical plate in a penetrating mode, locking devices are arranged at one end of the transverse rod and one end of the connecting rod, and a winding wheel is arranged between the two locking devices. According to the utility model, the problem of time-consuming and labor-consuming manual rope coiling is solved; the steel wire rope winding device solves the problems that an existing steel wire rope winding device is low ...

High-response GaN/Ga2O3 heterojunction ultraviolet photoelectric detector and preparation method thereof

The invention provides a high-response GaN/Ga2O3 heterojunction ultraviolet photoelectric detector and a preparation method thereof, and the preparation method comprises the following steps: oxidizing a part of gallium nitride into gallium oxide on a gallium nitride substrate through a laser direct writing method; a first electrode is deposited on gallium oxide, and a second electrode is deposited on unoxidized gallium nitride. According to the invention, a laser direct writing method is utilized to oxidize part of GaN into Ga2O3 on the GaN substrate, so that the preparation cost is reduced, and the preparation process is simplified; the responsivity is improved; and the rising/falling time of the light response is shortened.

Raincoat retractable safety helmet

The invention relates to the technical field of safety helmets, in particular to a raincoat retractable safety helmet which comprises a helmet body, an inner top is fixedly connected to the interior of the helmet body, a storage assembly is detachably connected to the inner top and detachably connected to the safety helmet body, and an auxiliary assembly is fixedly connected to the lower end face of the inner top and detachably connected to the safety helmet body. The auxiliary assembly can increase friction between the safety helmet and the head of a user, so that the head turning action is well matched with the safety helmet, the safety helmet can rotate along with the head, the user can well observe the situation outside the safety helmet, meanwhile, when it rains, the safety helmet and the raincoat are tightly connected, rainwater is not prone to entering the raincoat, and the safety helmet is convenient to use. After the raincoat is used, the raincoat can be conveniently and rapidly ...

Small atomizer integrated development platform and use method thereof

The invention provides a small atomizer integrated development platform and a use method thereof, the development platform is used for analyzing the atomization process of an atomizer, the development platform comprises a power supply, a control module, a laser granularity tester connected with the control module, and a high-speed camera arranged beside the small atomizer and provided with a macro lens; the control module is used for collecting dynamic process images of liquid crushing and atomizing by an atomizer atomizing device through the high-speed camera, counting fogdrop particle data of particles obtained after atomization by the atomizer through the laser particle size tester, and transmitting the dynamic process images and the fogdrop particle data to an external analysis platform; the small atomizer is powered by a power supply of the development platform, and the power supply comprises a voltage regulation module; the device can be used for achieving integrated development of ...

Power distribution network single-phase earth fault positioning method based on data acquisition equipment

The invention relates to the technical field of ground fault positioning, and particularly discloses a power distribution network single-phase ground fault positioning method based on data acquisition equipment, which comprises the following steps that: the data acquisition equipment detects the waveform of three-phase current when a single-phase ground fault occurs, and removes load current to obtain three-phase fault current; a three-phase fault current effective value is obtained through sliding calculation; traversing to find out the maximum value of the three-phase fault current effective values; determining the phase of the value as a fault phase; taking a sampling point of the value as a reference point; extracting the fundamental wave amplitude of the effective value of the three-phase fault current at the reference point; and calculating the ratio of the fundamental wave amplitude of the phase with the maximum fundamental wave amplitude to the sum of the fundamental wave amplitudes ...

Fault indicator filtering method

The invention relates to the technical field of power distribution network automation, and discloses a fault indicator filtering method, which comprises the following steps of: converting current and electric field time sequence data of each sampling channel into a two-dimensional picture through a Grubmi angle field method; synthesizing the two-dimensional images corresponding to the sampling channels into tensors in sequence; the convolutional neural network judges whether the data corresponding to the tensor is filtered one by one; and if it is judged that the fault is filtered, the fault indicator filters. Waveforms such as shaking in rainy days and the like are difficult to judge and screen by criteria and are easy to record mistakenly, and subsequent workload can be reduced by filtering shaking data in rainy days from recording data. Considering that the pressure on the calculation force of an existing collection unit is large when calculation is conducted through a two-dimensional ...

Ground fault judgment method based on data acquisition device

The invention relates to the technical field of distribution network automation, and discloses a data acquisition device-based ground fault judgment method, which comprises the following steps of S1, installing equipment at a line monitoring node, and acquiring a three-phase current when a line has a ground fault; s2, synthesizing the zero-sequence current of the monitoring node by using the collected three-phase current; s3, calculating an effective value and an amplitude value of the last cyclic wave of the zero-sequence current; s4, calculating an effective value and an amplitude value of the zero-sequence current in a sliding manner; and S5, setting a high-resistance fault criterion, if the criterion is met, determining that the fault is a high-resistance grounding fault, and otherwise, determining that the fault is a low-resistance grounding fault. The invention provides a ground fault judgment method based on a data acquisition device, and solves the problem that after steady-state ...

Zero line breaking detection method based on low-voltage internet-of-things sensing terminal

The invention relates to the technical field of low-voltage power distribution, and discloses a zero line breaking detection method applied to a low-voltage internet-of-things sensing terminal, and the method comprises the following steps: the low-voltage internet-of-things sensing terminal collects line data; performing multi-time-domain feature extraction on the data sliding window; adjacent feature subtraction is carried out on the multi-time-domain features; manually adding classification labels to the data; carrying out feature normalization processing, and dividing data into a training set and a test set; inputting an isolated forest model, and calculating to obtain an abnormal score of a corresponding sample; optimizing key parameters of the model; and according to the output of the trained model, realizing effective identification of the broken null line. Starting from the defects of difficulty in accurate threshold setting, high misjudgment rate and the like of a traditional detection ...

Method for predicting hydrogen corrosion resistance of stainless steel material based on hydrogen corrosion growth factors

The invention provides a method for predicting hydrogen corrosion resistance of a stainless steel material based on hydrogen corrosion growth factors, which comprises the following steps: step 1, cutting the stainless steel material into sheet samples in a linear cutting manner, respectively polishing the surfaces of the samples to be mirror surfaces by using grinding machine abrasive paper, washing with water, then wiping by using ethanol, and blow-drying by using cold air, finally putting into a dryer for later use; step 2, carrying out single-side nickel plating on the test piece, wherein the nickel-plated surface is a non-hydrogen-filled surface; after nickel plating is completed, washing the sheet sample with distilled water and alcohol in sequence for later use; by applying the technical scheme, the hydrogen corrosion resistance of the stainless steel material can be rapidly predicted, the test period is greatly shortened, meanwhile, the corrosion resistance of the material can be ...

Artificial float stone and its manufacturing method

The invention relates an approach to produce artificial pumice. It is burned by nether materials: inorganic material, sodium hydroxide, borax, Paris white, carbon dust and isinglass. Thereinto, inorganic material is selected from minerals or clay. It follows nether steps: mixing above materials in terms of given ratio, cracking blending to 60-200 items and loading into a module to bake.

Distribution line grounding fault positioning method based on data acquisition equipment

The invention relates to the technical field of distribution network automation, and discloses a distribution line grounding fault positioning method based on data acquisition equipment, which comprises the following steps: S1, installing the data acquisition equipment in a distribution line; the data acquisition equipment acquires zero-sequence voltage and zero-sequence current when the distribution line has a grounding fault; s2, selecting a sliding window and calculating the size of the window; calculating the similarity of the zero-sequence voltage and the zero-sequence current in a sliding manner; s3, selecting the similarity with the minimum value obtained in the sliding calculation process as the final similarity; s4, setting a ground fault positioning criterion; and grounding fault positioning is carried out based on the final similarity. According to the method, the similarity of the zero-sequence voltage and the zero-sequence current is calculated in a sliding manner by selecting ...

Refrigerator and freezer with nitrogen-making and fresh-keeping functions

The invention relates to the technical field of refrigerator and freezer equipment, in particular to a refrigerator and freezer with nitrogen-making and fresh-keeping functions, which comprises refrigerator equipment, a storage box is inserted in the refrigerator equipment, and a sealing assembly is fixedly mounted in the refrigerator equipment; by arranging a second connector, when the storage box is inserted into the refrigerator equipment, the storage box is arranged on the outer side of a guide block through a guide groove in a sleeving mode, so that the guide block slides in the guide groove, at the moment, the upper surface of the storage box abuts against the lower surface of a sealing gasket, and the interior of the storage box is in a sealed state; at the moment, a second connector and a sealing ring are inserted into the storage box, so that a vacuum machine is started to be matched with a connecting assembly and an auxiliary assembly, air in the storage box is conveniently pumped ...

Two-phase grounding short circuit fault positioning method based on fault indicator

The invention relates to a medium-voltage power distribution network technology, and discloses a two-phase grounding short circuit fault positioning method based on fault indicators, comprising the following steps: S1, dividing a line into n sections according to the number n of fault indicators on the line, n being not less than 2; s2, a fault indicator acquisition unit monitors a phase current, and if a current break variable exceeds a preset threshold value, it is considered that the phase has a short-circuit fault, and the phase is a fault phase; s3, if the fault current duration of the fault phase exceeds a preset time threshold value, the acquisition unit generates short-circuit fault three-phase SOE information and uploads the short-circuit fault three-phase SOE information to the collection unit; s4, the collection unit uploads the SOE information of the node to the master station; and S5, the master station carries out fault section positioning and informs a worker of a positioning ...

Inclined shaft hoisting winch convenient to braking

The utility model relates to an inclined shaft hoisting winch convenient to braking, including base, motor, speed reducer, reel, motor and reel set up side by side, and the rotary main shaft of motorand the power input shaft of speed reducer pass through shaft coupling fixed connection, the support frame of the vertical setting of fixedly connected with on the base is equipped with the pivot in the reel, the one end of pivot and support frame rotate to be connected, and the other end of pivot passes through the power output shaft fixed connection of shaft coupling and speed reducer, the rotary main shaft of motor goes up the cover and is equipped with the braked wheel, and braked wheel and rotary main shaft fixed connection, and the circumference of following the braked wheel is equippedwith arresting gear. The utility model discloses a simple structure, occupation space is little, and after arresting gear reacted, the reel was shut down the response and soon, is eliminated the potential ...

Method for copying sharkskin surface micro groove structure

The invention discloses a method for copying a sharkskin surface micro groove structure and belongs to the technical field of biological constraint molding. The method is characterized by comprising the following implementation steps: pretreating sharkskin; blowing mold release agent; pouring unsaturated resin; vacuumizing; releasing the unsaturated resin from a mold; blowing mold release agent; pouring liquid silicon rubber; vacuumizing; and releasing the liquid silicon rubber from a mold. The silicon rubber simulation sharkskin thin film obtained by the steps can copy the surface with a riblet micro groove structure of a shark completely and clearly and can be widely used in fields of resistance reduction in aircraft, ship and oil pipe projects and other projects.

Non-intrusive load identification method based on intelligent electric meter

The invention relates to the technical field of load identification, and discloses a non-intrusive load identification method based on an intelligent ammeter, and the method comprises the following steps: modeling the capacitance, inductance and resistance characteristics of an electric appliance through employing a directed voltage-current trajectory diagram drawing method; fundamental wave features of the corrected voltage and current signals are extracted; extracting abstract features of the trajectory diagram; adopting multi-layer sharing jump connection to obtain fusion features; training a capsule neural network by using the obtained fusion features; and outputting the to-be-identified load type by using the method. Aiming at the problem of insufficient capacitance, inductance and resistance characteristics of an electric appliance modeled by a traditional method, the invention provides a drawing method of a directed voltage-current trajectory diagram, so that the characteristics ...

Freeze preservating method for domestic pig skin tissue

Network health detection method and device, electronic equipment and storage medium

The embodiment of the invention discloses a network health detection method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining a current local resource from a local resource linked list when a current health detection task meets a concurrency control condition, and the local resource in the local resource linked list comprises a source IP address and a source port; a remote resource linked list corresponding to the current local resource is acquired, the remote resource linked list comprises a remote resource bound with the current local resource history, and the remote resource comprises a destination IP address and a destination port; if the remote resource in the remote resource linked list is not in the time waiting state, or the remote resource in the time waiting state is different from the target remote resource of the current health detection task, establishing a first binding relationship between the current health detection task ...