1572 results about "Pressure vessel" patented technology

The invention provides a multi-mode ultrasonic fusion pressure vessel weld defect nondestructive testing method and system, and relates to the technical field of nondestructive testing. According to the method, geometric parameters of a welding seam are obtained through three-dimensional laser scanning, and an optimal scanning parameter set is generated; driving ultrasonic phased array equipment to scan for one time and synchronously acquire shear wave full-matrix capture and longitudinal wave linear scanning data; performing energy flow angular spectrum analysis and envelope analysis on the bimodal data, extracting defect feature parameters and constructing a three-dimensional feature tensor; carrying out multi-dimensional feature fusion by adopting Tucker decomposition, and enhancing a core tensor through physical modeling; generating three types of defect indication diagrams including a defect existence possibility diagram, a defect relative scale diagram and a defect space orientation diagram from the enhanced feature tensor; and the three types of indication diagrams are visually presented for comprehensive interpretation of detection personnel. Through multi-modal data fusion and physical modeling enhancement, the defect identification accuracy and detection efficiency are remarkably improved, the false alarm rate is reduced, and reliable technical support is provided for pressure vessel welding seam safety detection.

The invention discloses an in-situ global foreign matter checking and grabbing system for reactor internals on the lower portion of a reactor. The in-situ global foreign matter checking and grabbing system for the reactor internals on the lower portion of the reactor comprises a base device, an adjusting device and a foreign matter grabbing device. The foreign matter grabbing device is arranged on the base device through the adjusting device. The foreign matter grabbing device comprises a flexible arm assembly, a flexible arm driving assembly, a quick change assembly, at least one clamping jaw used for grabbing foreign matter and a video tracking and checking assembly used for searching the foreign matter and monitoring the grabbing condition. The flexible arm assembly is arranged on the adjusting device; the at least one clamping jaw is detachably arranged on the flexible arm assembly through the quick-change assembly; the video tracking and checking assembly is arranged on the adjusting device; according to the invention, the flexible arm assembly carries various types of clamping jaws to carry out automatic grabbing operation, so that the in-service nuclear power plant reactor internals can accurately, efficiently and safely grab and clean foreign matters in the in-situ interior of a pressure vessel in a whole region.

The invention relates to the technical field of safety monitoring of a nuclear reactor, and particularly discloses a multi-region pressure overrun leakage monitoring method for a reactor pressure vessel. The method comprises the steps of multi-region pressure data acquisition, real-time pressure field model construction, dynamic pressure field baseline modeling, pressure overrun anomaly detection, leakage source accurate positioning and evaluation based on spatial gradient analysis, topological structure mapping and multi-sensor data fusion, and graded early warning and response. By the adoption of the technical scheme, real-time and fine monitoring of pressure distribution in the reactor pressure vessel can be achieved, the rapid and accurate judgment and positioning capacity of leakage events is improved, the operation safety and reliability of nuclear power facilities are enhanced, and the reliability of the nuclear power facilities is improved. The defects of independent monitoring, local accurate positioning and complex working condition adaptability of multi-region pressure over-limit leakage in the prior art are overcome.

The invention provides a pressure vessel full life cycle stress fatigue assessment and predictive maintenance system based on digital twinning. The system comprises a model construction module used for constructing a three-dimensional digital twinning model corresponding to a solid pressure vessel; the data synchronization module is used for integrating historical test data and actual operation load data of the solid pressure vessel into the three-dimensional digital twinborn model and simulating dynamic stress distribution of the solid pressure vessel in an actual operation load process; the evaluation and maintenance module is used for evaluating the accumulated fatigue damage of the solid pressure vessel and the residual fatigue life in the current state based on the dynamic stress distribution, and determining a potential risk area and a risk time window of the solid pressure vessel based on an evaluation result; and on-demand inspection plans and predictive maintenance strategies of the entity pressure vessels are generated based on the potential risk areas and the risk time windows. Stress fatigue evaluation of the whole life cycle is achieved, and the accuracy and reliability of life prediction are remarkably improved.

The invention discloses a digital twinborn model construction and life prediction method for pressure vessel defect data, and belongs to the technical field of pressure vessel safety assessment, and the method comprises the following steps: a defect topological graph construction and feature extraction step: converting defect space distribution into a graph structure, and extracting features by adopting a graph attention network; a crack propagation physical constraint modeling step: predicting a defect propagation behavior by adopting a physical information constraint neural network; an uncertainty quantification and reliability evaluation step: calculating a confidence interval and a failure probability of the residual life by adopting a Monte Carlo Dropout method; the model parameters are dynamically adjusted through an online learning mechanism, high-precision real-time prediction of defect evolution and reliability evaluation of the residual life are achieved, and the calculation efficiency is improved by more than two orders of magnitude compared with a traditional finite element method.

The invention discloses a reactor lower internals reactor core supporting plate global foreign matter video inspection grabbing device which comprises a rack, a video inspection device and a foreign matter grabbing device, a positioning pin is arranged at the bottom of the rack, and a containing groove used for storing foreign matter is further formed in the rack; the video inspection device is movably installed on the rack in the height direction and comprises a video inspection mechanism used for conducting foreign matter video inspection. The foreign matter grabbing device is movably installed on the rack in the height direction and comprises a foreign matter grabbing mechanism used for grabbing foreign matter. By applying the video inspection and grabbing equipment for the global foreign matters on the reactor core supporting plate of the reactor lower reactor internals, the foreign matters on the reactor core supporting plate can be inspected and grabbed when the reactor internals are in situ, the damage to the components and a pressure vessel body caused by hoisting of the reactor internals can be effectively avoided, the steps of hoisting of the reactor internals and the like are reduced, and the production efficiency is improved. And the overall foreign matter checking and grabbing operation efficiency can be effectively improved.

The invention relates to the technical field of pressure vessel health monitoring and nondestructive testing, in particular to an electromagnetic acoustic surface wave-based pressure vessel intergranular corrosion non-contact detection system, which comprises the following modules: a multi-field coupling electromagnetic acoustic surface wave detection module, which comprises a plurality of detection unit arrays, each detection unit comprises a magnetic biasing module and an impedance matching module and is used for generating a local magnetic field on the surface of the pressure vessel and optimizing signal excitation and receiving; and the signal acquisition and preprocessing module is used for acquiring the surface wave signal of the detection module and carrying out denoising, filtering, curved surface coupling difference correction and lift-off correction on the signal to obtain high-quality signal data. According to the method, non-contact quantitative detection of the intergranular corrosion of the pressure vessel is realized through multi-field coupling electromagnetic acoustic surface wave detection and microscopic and macroscopic mapping and inversion, so that the problem that early corrosion is difficult to quantify due to the fact that contact ultrasound is mostly adopted in traditional pressure vessel detection and grain boundary micro-damage cannot be effectively identified is solved.

The invention relates to the technical field of data processing, in particular to a pressure vessel data monitoring method based on a high-precision sensor. Obtaining a data period according to data change characteristics of the monitoring data sequence; obtaining the data deviation degree of the current moment according to the data difference characteristics of the current moment and the same moment in the historical data cycle; obtaining a suspected abnormal moment according to the data deviation degree; obtaining comprehensive stability according to the data difference characteristics of the suspected abnormal moment at the same moment in the historical data cycle and the fluctuation difference characteristics of the suspected abnormal moment at the same moment in the historical data cycle; and according to the data deviation degree of the suspected abnormal moment, the comprehensive stability and the quantity characteristics of the suspected abnormal moments of other sensors at the same moment, obtaining the fault abnormity degree. According to the invention, the pressure vessel at the current moment is monitored according to the fault abnormity degree, and the accuracy of pressure vessel data monitoring is improved.

An aircraft structure including an outer mold line skin, one or more frames located on an inner surface of the outer mold line skin having an outer flange attached to an inner surface of the outer mold line skin, a first core filler in contact with the outer flange, an inner flange in contact with the first core filler and a web skin, wherein the web skin and the outer flange encapsulate the inner flange and at least a portion of the first core filler, and an arched inner mold line skin located between each frame of the one or more frames, wherein the arched inner mold line skin is in contact with each web skin of the one or more web skins.

The invention relates to a multi-modal sensing fusion-based automatic correction method and system for a welding robot body, the system comprises a three-level distributed architecture of a sensing layer, an edge layer and a control layer, the sensing layer is integrated with a millimeter wave radar, a camera, a six-dimensional force / torque sensor, a welding power supply data acquisition module and an acoustic emission sensor, and multi-modal data acquisition is realized; the edge layer runs a fusion algorithm through an embedded AI computing platform carrying a GPU to complete data processing and decision making; and the control layer receives the deviation correction instruction to drive the robot to execute motion correction. The method comprises the steps of multi-modal data real-time acquisition and synchronization, data preprocessing and feature extraction, multi-source information fusion and decision making, and real-time control and execution. The problems of single sensing dimension, response delay, weak anti-interference capability and the like in the prior art are solved, the robustness, the real-time performance and the deviation correction precision of the system are improved, full-automatic intelligent welding is realized, and the method is suitable for high-precision scenes such as shipbuilding and pressure vessel welding.

The invention relates to an air tightness detection device and method based on resonance frequency shift of a resonant cavity, belongs to the technical field of air tightness detection, and aims to solve the problems of high equipment cost, complex operation, low efficiency and difficulty in realizing multi-parameter quantitative detection in the traditional air tightness detection technology. High-purity helium with rated pressure is filled into a to-be-detected piece through a gas compressor, the to-be-detected piece is placed in a volume-adjustable detection container after pressure maintaining, and leaked helium is pumped by a vacuum pump to flow into a resonant cavity; resonance frequency deviation caused by helium concentration changes is monitored, temperature and humidity calibration data are combined, three air tightness parameters including the leakage rate (Pa.m / s), the leakage speed (mL / min) and the leakage pressure (Pa) are calculated in real time through a microcontroller, and the air tightness grade of a to-be-detected piece is output according to the air tightness detection standard. According to the device, the volume of the detection container is adaptively adjusted through the sliding rail, and the detection efficiency and adaptability can be remarkably improved by combining frequency mixing excitation and a rapid frequency calibration technology; according to the method, resonance frequency shift-helium concentration-airtightness parameters are converted, and high-precision, multi-parameter and integrated airtightness detection is realized. The invention has the advantages of fast response speed, strong anti-interference performance, low cost and the like, is suitable for fast automatic leak detection of industrial products such as sealing devices, pressure containers and the like, and provides a new scheme for trace gas detection and gas tightness grading.

The invention relates to a force control-based weld joint ultrasonic detection method for a pressure container, and solves the technical problem of how to improve the precision, stability and reliability of defect detection of a weld joint of the pressure container by a mechanical arm driving an ultrasonic probe. A zero drift value of a six-dimensional force sensor and gravity components of an ultrasonic probe in six dimensions are calculated, then actual contact force and actual contact torque are calculated, the actual contact force is input into an impedance control module, force position control of a mechanical arm is achieved, cooperative compliant control over the contact force and the pose of the probe is achieved, and the mechanical arm is controlled. And the detection stability and reliability of the surface and internal defects of the welding seam are obviously improved.

The invention relates to a rotational flow generator for gathering various cheap objects, in particular to a rotational flow generator for gathering air and water based on medium-low temperature gas of 40-350 DEG C as a core acting medium, the rotational flow generator, the medium-low temperature gas and the medium-low temperature gas are low-cost media, and equipment is made of medium-low temperature materials, so that the rotational flow generator is called as various cheap objects. A water collecting and pressure stabilizing area is arranged at the inner bottom of a cavity of the cyclone generator body, a backflow pipe is matched with the water collecting and pressure stabilizing area, penetrates through the cyclone generator body and then is connected with an external hot water pool, and according to the first principle of gas acting, how to enable an engine rotating wheel to reach the needed rotating speed at the lowest cost and how to rotate faster, and a series of structural designs are adopted. Two treasures, namely free atmospheric pressure potential energy and micro-cost water, are gathered together, the potential of medium and low temperature gas is completely squeezed, the detonation type unlocking of the medium and low temperature gas enables the medium and low temperature gas which is originally low in effect to create a multi-cause comprehensive total amount, and maximization of benefits is achieved.

The invention belongs to the technical field of welding seam detection, and particularly relates to a titanium pressure vessel welding seam quality automatic detection device, which comprises a plurality of bases uniformly distributed on the outer side of a columnar vessel in a surrounding manner, a plurality of connecting belts uniformly distributed on the outer side of the columnar vessel in a surrounding manner, and a detection probe arranged above each base, the connecting belt is arranged between the two bases on the same side, and each base is provided with a winding mechanism used for winding the connecting belt. According to the invention, nondestructive detection can be carried out on the welding seam of the titanium pressure vessel, automatic walking scanning is realized without manual operation, the working efficiency is improved, the stability of the lift-off distance of the probe is ensured, the accuracy of the detection result is improved, carrying and moving are convenient, and the device is suitable for post-welding detection and subsequent regular detection. And meanwhile, the device can be suitable for welding seam detection of titanium pressure containers with different diameters and welding seam detection of pipelines with different diameters, and the adaptability is good.

The invention relates to the technical field of laser welding, and provides a pressure vessel barrel laser welding all-position dynamic molten pool monitoring method which comprises the following steps: arranging a laser heat source and monitoring equipment to obtain molten pool temperature data and molten pool form data of a to-be-welded pressure vessel barrel; constructing a thermodynamic constraint based on a heat conduction equation, and training a molten pool monitoring model in combination with temperature data; constructing a hydrodynamic constraint based on a hydrodynamic equation, and fusing morphological data to further optimize the model; a target molten pool monitoring model with physical mechanism consistency is obtained by constructing thermal-fluid coupling physical constraints and combining with strengthening model training; and finally, inputting space-time coordinates of a to-be-measured position to realize inversion of the dynamic state of the molten pool in the all-position welding process. According to the method, multi-physics field constraint and data driving modeling are fused, the generalization ability and robustness of the model under the complex welding posture are improved, and the technical problem that the molten pool state is difficult to accurately monitor in all-position laser welding is effectively solved.

The present disclosure relates to a quick fill device for use with a valve assembly, and related methods of filling a pressure vessel. A valve assembly that can be secured to a pressure vessel includes a vessel, a fill valve, and an overfill valve. A preferred example of the device includes a body, a valve trigger pin, a vent trigger pin, and a handle. A valve engagement end of the body can be releasably secured within the vessel. At this point, moving the handle to an open position causes the valve trigger pin to force the fill valve to an open configuration, and causes the vent trigger pin to force the overfill valve to a fluid venting configuration. A rigid fill tube is in fluid supply communication with a fuel supply port of the body. The fill tube and the handle can be elongate, and extend in a common direction.

The invention discloses a method for quantitatively evaluating the three-dimensional shape of a thinning defect in a plate under ultrasonic guided wave field undersampling scanning, belongs to the field of industrial nondestructive testing, and particularly relates to high-precision three-dimensional shape reconstruction and thickness loss quantification of a corrosion defect in a metal plate shell structure (such as aerospace skin, a pressure vessel wall, an oil pipeline and the like). According to the method, sparse sampling guided wave field reconstruction, full waveform inversion (FWI) and priori knowledge constraint are fused, Shannon sampling theorem limitation is broken through, efficient measurement of corrosion depth, contour and distribution under the conditions of a single excitation source and a limited view angle is achieved, and the method is suitable for rapid online detection in a complex industrial environment.

To suppress horizontal vibration of a nuclear pressure vessel during an earthquake, and make a dynamic vibration absorber compact to suppress an installation space of the dynamic vibration absorber, in a nuclear power plant.SOLUTION: An earthquake resistance support device for a nuclear power plant is arranged in a reactor containment vessel, and suppresses horizontal vibration of a reactor pressure vessel supported by a pedestal when an earthquake occurs. The earthquake resistance support device comprises a horizontal beam that is arranged between the reactor containment vessel and the reactor pressure vessel, and the pedestal, and extends in the radial direction of the reactor pressure vessel and the pedestal; and a dynamic vibration absorber installed on the horizontal beam. The dynamic vibration absorber comprises a hollow weight extrapolated to the horizontal beam and movable in an axial direction of the horizontal beam, and a coil spring device that elastically supports the hollow weight in the axial direction of the horizontal beam, to allow the hollow weight to vibrate in the axial direction of the horizontal beam.SELECTED DRAWING: Figure 3

The invention discloses a self-adaptive ultrasonic detection device for a pressure vessel connecting pipe, the self-adaptive ultrasonic detection device comprises a base connected with a driving mechanism and at least three detection modules, the base is of an arc-shaped structure with the radius smaller than that of a flow guide ring cavity of a pressure vessel, and the three detection modules are arranged on the base at intervals; each detection module comprises a telescopic mechanism, a plurality of self-adaptive probe frames and a plurality of ultrasonic probes, the telescopic mechanisms are fixedly mounted on the base, and the output ends of the telescopic mechanisms are fixedly connected with the self-adaptive probe frames so as to drive the self-adaptive probe frames to do linear motion; the ultrasonic probe is installed on the self-adaptive probe frame, and the self-adaptive probe frame has the self-adaptive pitching function and the self-adaptive side tilting function so that the ultrasonic probe can adapt to the surface contour of a workpiece. Through the arrangement of the arc-shaped base and the multiple detection modules and the cooperative cooperation of telescopic driving and the self-adaption function, a set of integrated linkage detection mechanism is formed, and continuous, stable and full-coverage ultrasonic detection of the circumferential weld in a compact space is achieved.

The invention discloses electroplating equipment for pressure vessel production, which belongs to the technical field of pressure vessel electroplating, and comprises a main body mechanism for clamping a pressure vessel and electroplating the inner wall of the pressure vessel, the main body mechanism is provided with a cleaning mechanism for polishing and cleaning the inner wall of the pressure container and a pickling mechanism for pickling the pressure container; according to the invention, the unique track module in the main body mechanism is matched with the lifting electric cylinder, the lifting ring and the inner convex ball, so that the automatic and accurate conversion of the pressure vessel among grinding, pickling, electroplating and loading and unloading stations is realized, the real automatic circulating production is realized, and the production efficiency is greatly improved; according to the main body mechanism provided by the invention, in the electroplating process, through the design that the upper pressing seat and the opening end of the pressure container are automatically sealed and matched and the pressing-in plate is pressed downwards to enable electroplating liquid to enter the electroplating inner pool from the electroplating outer pool, gas in the container can be effectively and forcibly exhausted, and it is ensured that a high-quality coating is obtained on the inner wall of the container.

The utility model relates to the technical field of air pressing equipment, in particular to air pressing equipment integrating an air dryer and an air compressor into a skid, which comprises a skid seat, an air compressor, a refrigeration type compressed air dryer, a compressed air filter, an air-water separator group and a double compressed air filter group. The utility model focuses on the innovation of the air pressing equipment, and provides the air pressing equipment which integrates the air dryer and the air compressor into the skid for solving the problems of dispersion, low efficiency, poor precision and the like of the traditional air dryer and the traditional pressing equipment. The air compressor supplies air, the refrigeration type compressed air dryer dehumidifies and then is precisely regulated and controlled through the PLC in combination with the high-precision pressure controller, and the device has the outstanding advantages of integration, high efficiency, precise pressure control, safety, reliability, wide application and the like, and can be widely applied to air pressure testing requirements of industries such as petrochemical engineering, natural gas, pressure pipelines and pressure containers.

The invention belongs to the technical field of petroleum storage, and particularly relates to a shockproof storage pressure container for liquefied petroleum gas. Comprising a pressure tank, multiple columns of partition plates are arranged in the pressure tank, and first through holes transversely penetrate through the bottom ends of the partition plates; a blocking assembly is arranged in the partition plate, the output end of the blocking assembly moves in the vertical direction to block the first through hole, the pressure tank is divided into a plurality of compartments used for containing liquefied petroleum gas, and the effect of rapidly separating and containing liquefied petroleum gas fluid is achieved; a floating plate perpendicular to the partition plate is further arranged in the pressure tank, the partition plate penetrates through the floating plate, the floating plate ascends and descends along with the liquid level of the liquefied petroleum gas and is fixed through a limiting assembly to limit shaking of the liquid level, and stable transportation of petroleum is guaranteed.

Apparatus and related methods relate to a trailer with interchangeable modules. In an illustrative embodiment, a trailer may be configured to be towed by a pickup truck with a bed. The trailer may, for example, include a chassis that is at least partially exposed. A drive module may, for example, be configured to generate rotary motion from an energy storage module. A plurality of interchangeable modules may, for example, be configured to selectively and releasably couple to the trailer via mount modules. The interchangeable modules may, for example, include a fluid transfer pump module configured to transfer fluid from an inflow conduit to a receptacle external to the trailer. A pressure vessel may, for example, be configured to transport hazardous gas. A flatbed deck may, for example, be configured to cover the chassis in at least the location of the pressure vessel. Various embodiments may advantageously provide seasonal adaptability.

The invention discloses a pressure vessel weld reinforcement automatic detection device and detection method, and relates to the technical field of weld detection. The automatic detection device for the surplus height of the welding seam of the pressure vessel comprises a pressing plate which can move downwards in the vertical direction; a plurality of arc-shaped clamping plates are evenly arranged on the inner side of the positioning ring in the circumferential direction, and the arc-shaped clamping plates are stressed to move inwards in the downward pressing process of the pressing plate, so that the outer wall of the connecting pipe is clamped; and the flexible track is arranged on the periphery of the connecting pipe in a surrounding mode, a laser detector is arranged on the flexible track, and the laser detector can move in the circumferential direction of the flexible track and is used for conducting continuous scanning detection on the excess weld metal of the saddle-shaped welding seam. The pressing plate, the positioning column, the limiting plate and the arc-shaped clamping plate form a multidirectional cooperative positioning and clamping mechanism, so that the integrated constraint of axial pressing, radial centering and circumferential limiting of the connecting pipe is realized, and the relative positioning precision and the overall structural stability between the detection device and the connecting pipe are remarkably improved.

The purpose of the present invention is to suppress the solidification of a pressure medium and to perform a pressurization process at a required pressure. The isostatic pressing device (10) uses a pressure medium having the property that the higher the pressure is, the higher the viscosity is. An isostatic pressing device (10) is provided with: a pressure vessel (12) in which a processing space (12a) capable of accommodating a pressure medium is formed; a supercharger (14) that pressurizes the pressure medium in the processing space (12a) to obtain a set pressure; a first heater (37), which is provided in a high-pressure pipe (32) connecting the supercharger (14) and the pressure vessel (12), and which heats the pressure medium to a target temperature before the pressure medium is introduced into the processing space (12a); and a second heater (39) that is provided upstream of the first heater (37) in the high-pressure pipe (32) and heats the pressure medium before reaching the first heater (37).

The invention discloses a pressure vessel health assessment system based on multi-modal data fusion, and relates to the technical field of pressure vessel safety detection, and the system comprises a synchronous fusion module, a topology learning module, an event detection module and a causal assessment module. The synchronous fusion module obtains acoustic emission time domain signals and weld joint digital images, and a feature fusion set is generated through space-time registration; the topology learning module inputs the feature fusion set into a graph neural network of specific nodes and edge weights, and generates a graph embedding vector through graph convolution; the event detection module accumulates a graph embedding vector time sequence, calculates a cosine similarity identification mutation point, and extracts a damage event feature packet; the causal evaluation module constructs a multi-modal feature causal graph, analyzes direct and indirect influence factors, and outputs damage type labels and confidence. According to the system, multi-modal feature topological correlation learning and causal-driven damage evaluation are realized, and the accuracy of health detection of the pressure vessel is improved.

The invention discloses a method and system for detecting the aging state of a pressure vessel. The method comprises the steps that a target pressure vessel is knocked, and sound signals and sound wave signals generated under the knocking effect are collected; converting the collected sound signal into an audio analog signal to obtain a sound vibration waveform, then generating a new sound wave signal according to the sound vibration waveform, and correcting the collected sound wave signal by using the current new sound wave signal; and performing frequency domain analysis on the corrected sound wave signal, thereby obtaining an aging state detection result of the current target pressure vessel according to a frequency domain analysis result. According to the invention, accurate detection of the aging state of the pressure vessel is realized under the conditions of any working state of the pressure vessel and no damage to the structure and the function of the vessel.

This application relates to the field of LNG cryogenic pressure vessel welding technology, specifically disclosing a multi-level collaborative control method for magnetic blow in 7Ni steel welding based on a quantified remanent magnetization threshold. Addressing the problems of severe magnetic blow and poor all-position welding stability caused by the high permeability, high coercivity, and difficulty in demagnetizing 7Ni steel, the method uses a remanent magnetization threshold of ≤50Gs to construct a collaborative control system encompassing pre-welding quantitative management, welding polarity and ground wire optimization, welding parameter and sequence constraints, real-time monitoring and automatic demagnetization closed-loop during welding, and post-weld quality verification. This application can effectively suppress all-position magnetic blow, avoiding defects such as arc deviation, incomplete penetration, slag inclusion, and porosity; achieving a first-pass yield of ≥97.5% for the main weld of the LNG storage tank, with a joint impact energy of ≥80J at -196℃ and a hardness of ≤300HV10, meeting cryogenic service specifications and applicable to the industrial welding production of large 7Ni steel LNG storage tanks.

The utility model relates to the technical field of pressure containers, and particularly discloses a pressure-adjustable pressure container which comprises a tank body, a connecting end is fixedly connected to the upper side of the tank body, an air hole is formed in one end of the connecting end, a feeding port is fixedly connected to the end, close to the connecting end, of the tank body, and a regulation and control assembly is arranged at the upper end of the connecting end. The regulation and control assembly comprises a cover plate arranged on the upper side of the connecting end, the lower side of the cover plate is fixedly connected with a first sealing gasket, the lower side of the first sealing gasket is attached to the connecting end, the lower end of the cover plate is fixedly connected with a connecting plate, and a fixing bolt is in threaded engagement with the interior of the connecting plate; the inner side of the upper end of the cover plate is fixedly connected with a motor, an output shaft of the motor is fixedly connected with a first gear, one end of the first gear is in gear engagement with a second gear, the lower end of the second gear is rotationally connected to the tank body, automatic regulation and control can be achieved through the regulation and control assembly, the regulation and control index is more accurate, manual regulation and control by workers are not needed, and then regulation and control convenience is improved.

The utility model provides a circumferential welding device for a pressure vessel, which relates to the technical field of welding devices and comprises a frame, transverse rods are symmetrically and fixedly mounted on the inner side of the bottom of the frame, sliding plates are slidably connected to the outer surfaces of the transverse rods, and telescopic cylinders are symmetrically and fixedly mounted on one sides of the sliding plates. The output end of the telescopic air cylinder is rotationally connected with the first jig, a fixing plate is fixedly installed on the inner side of the cross rod, rotating shafts are symmetrically and rotationally connected into the fixing plate, the ends, close to the sliding plate, of the rotating shafts are rotationally connected with the second jig, belt wheels are fixedly installed at the ends, away from the second jig, of the rotating shafts, and a conveying belt is arranged in the belt wheels in a sleeved mode. According to the utility model, two pressure containers can be circumferentially welded at the same time, and compared with the traditional equipment which can only perform single welding, the production efficiency is greatly improved, the production cycle is effectively shortened, the large-scale production requirement is met, an enterprise can produce more qualified products within the same time, and the market competitiveness is enhanced.