262 results about "Stress relaxation" patented technology

The invention discloses a cultural relic preventive protection method based on big data analysis, belongs to the technical field of cultural relic protection, and mainly aims to solve the technical problem that a complex damage mechanism caused by mutual coupling of torsional deformation and inclined deformation in cultural relic protection is difficult to accurately predict. A dual-mode deformation data stream is obtained through a multi-point sensor, accurate data alignment is achieved through millisecond-level time synchronization processing, and correlation characteristics between deformation modes are recognized by calculating a coupling strength coefficient through correlation analysis. And when the coupling strength exceeds a threshold value, determining a deformation propagation direction vector by combining a spatial interpolation method, and calculating an internal stress distribution field and positioning a stress concentration area by utilizing a finite difference method. High-frequency sampling tracking is carried out on the high-risk area, and a stress relaxation time constant and a creep coefficient are obtained. Accurate prediction and active protection of cultural relic deformation damage are realized.

The invention discloses a ten-thousand-square-meter muddy deep foundation pit supporting structure deformation prediction method which comprises the following steps: establishing a soil-supporting interaction rheological model, simulating stress relaxation and creep effects of muddy soil in combination with a Burgers rheological model, and realizing dynamic evolution prediction of a supporting structure deformation field and an internal force field. According to the method, the particle filter algorithm is adopted to carry out denoising processing on real-time monitoring data, model parameters are updated through the Bayesian method, and the prediction precision is improved. Meanwhile, nonlinear mapping of the deformation rate and the internal force increment is established by using a random forest algorithm, and instability risk probability distribution is generated. According to the method, multi-stage collapse early warning thresholds are set, monitoring data and prediction results are fused by adopting a weighted average method, and abnormal points of a high-risk area are identified. For a high-risk area, a genetic algorithm is applied to optimize the rigidity and prestress distribution of a supporting system, effective control over deformation and internal force of a supporting structure is achieved by dynamically adjusting construction parameters, and construction safety of the deep foundation pit is ensured.

The invention discloses a light-weight manufacturing method and system for a PET bottle for food packaging, particularly relates to the technical field of PET bottle blank manufacturing, and aims to solve the problem that the subsequent blow molding quality is affected due to the fact that complex internal stress is generated in a bottle blank due to a rapid cooling process after injection molding in the prior art. Image information and temperature distribution data of a bottle blank after injection molding are obtained, geometric features and cooling rate differences are analyzed and recognized based on multi-physics coupling, a stress cause weight evaluation model is established to generate a stress distribution map, and then structural entropy increase factors under different temperature adjustment paths are simulated and calculated according to thermodynamic parameters, so that the temperature adjustment precision is improved. And carrying out partitioned temperature adjustment treatment on the bottle blank, and finally, carrying out constant-temperature and constant-humidity standing to sufficiently relax the stress. The internal stress distribution of the bottle blank can be effectively controlled, and the wall thickness uniformity and the mechanical property consistency of the light-weight PET bottle are improved.

The invention provides a data processing method and system based on intelligent construction, and relates to the technical field of intelligent construction.The method comprises the steps that viscosity, a temperature peak value, temperature and humidity and time delay distortion data in the solidification stage are collected in real time in the concrete pouring construction process, and a material stress relaxation model is constructed to calculate three-dimensional stress distribution; meanwhile, mapping sound wave time delay distortion data into a spatial topological graph, and extracting propagation anomaly features by using a space-time graph convolutional network; and generating a crack risk distribution diagram by fusing stress distribution and abnormal characteristics, and finally, accurately positioning a potential defect area according to risk gradient change. The early warning capability of concrete construction quality defects is improved.

The invention discloses an invasion limit surrounding rock excavation method for a large deformation section of soft rock, and relates to the technical field of invasion limit surrounding rock excavation construction for the large deformation section of the soft rock. The invasion limit surrounding rock excavation method for the large deformation section of the soft rock comprises the steps that refined partitioning of an invasion limit body is achieved through dense scanning and loose circle testing; dividing the invasion limiting body into a core pressure-bearing area and a peripheral stress relaxation area; a main stress diversion arch crossing an invasion limit section is constructed through full-ring radial grouting reinforcement and erection of a strong profile steel temporary cover arch, and effective stress transfer is achieved; the mode of subarea gradual type dismantling and chiseling and instant supporting is adopted, a peripheral stress relaxation area is treated firstly, then a core pressure-bearing area is treated, and surrounding rock disturbance is reduced; the circumferential stress equalization is realized by compensating grouting in stages and dynamically adjusting the grouting pressure according to real-time monitoring data. According to the method, the excavation construction safety of the invasion limit surrounding rock of the large deformation section of the soft rock can be improved, surrounding rock disturbance is reduced, stress distribution is optimized, and the treatment efficiency of the invasion limit surrounding rock is improved.

The invention discloses a heavy-duty gas turbine blade creep fatigue life design method considering an anisotropic effect, and relates to the technical field of gas turbine key component creep fatigue life evaluation.The method comprises the steps that orientation factor parameters on characteristic orientation are determined based on tensile data on [001] crystal orientation; constructing a modified stress relaxation formula; constructing an anisotropic failure strain energy density equation based on the pure creep performance data and the orientation factor parameters, and determining an upper platform of failure inelastic strain energy density on [001] crystal orientation; further determining an upper platform of the failure inelastic strain energy density on the feature orientation; constructing a creep damage prediction model based on a modified stress relaxation formula and an anisotropic failure strain energy density equation; and adopting the creep damage prediction model to obtain the creep fatigue life of the anisotropic turbine blade material sample. The method meets the actual requirements of service life evaluation of the high-temperature part of the heavy-duty gas turbine.

The invention relates to the technical field of material preparation, and discloses a nano-composite construction preparation method and system for a high-flexibility display film, and the method comprises the steps: setting a composite construction sequence corresponding to a nano-composite material; calculating the interface coupling bonding strength of the nano composite material in the compounding process, calculating the deformation adaptation coefficient of the display film substrate in the compounding process, and analyzing the dynamic synergistic compounding efficiency of the nano composite material; thermal gradient distribution data and pressure load data of the nanocomposite in the construction process are recorded, the stress relaxation rate in the display film after construction is completed is calculated, the uniform attenuation coefficient of the interlayer structure of the display film is calculated, and the multi-dimensional structure stability performance of the display film is evaluated; and determining a composite gradient distribution strategy of the nano composite material, formulating preparation process parameters of the display film in nano composite construction, and executing composite construction preparation of the nano composite material to obtain a finished product of the high-flexibility display film. According to the invention, the quality stability of the preparation of the high-flexibility display film can be improved.

The invention provides an aluminum alloy door and window seamless welding system, which belongs to the technical field of door and window welding, and comprises a machine table, a door and window profile and a welding gun, and further comprises a positioning and grinding assembly and a dedusting and destressing assembly, welded door and window profiles do not need to be carried to independent polishing equipment, polishing is directly completed through state switching of the pressing plate, the inter-process circulation time is shortened, and positioning deviation caused by secondary clamping of traditional equipment is avoided; the functions of aluminum scrap collection and weld joint stress release in the polishing process are integrated in the pressing plate, polishing-dust removal-stress relief three-in-one synchronous treatment is achieved, the residual stress elimination effect is maximized, deformation of doors and windows in later use is effectively avoided, vibration force is transmitted through the pressing plate, and damage to the doors and windows is avoided; in addition, the vibration time is synchronous with grinding, stress relaxation is promoted through the micro-plastic state during material grinding instead of forced vibration in the cold state, and the welding seam cracking risk is greatly reduced.

The invention provides an intelligent temperature control method and system for relieving stress of a glass annealing kiln. The method comprises the following steps: transmitting acoustic surface waves through a distributed sonic sensor to collect stress propagation data in glass, decoupling coupling characteristics of sound velocity and temperature, extracting a relaxation time constant, and generating a stress relaxation rate; performing time difference cross-correlation analysis to construct a stress propagation three-dimensional gradient field, establishing an incidence relation between the relaxation rate and the gradient field, and constructing a mapping strategy of the temperature set value and the relaxation rate according to the incidence relation; generating a dynamic temperature adjusting parameter and converting the dynamic temperature adjusting parameter into a heater power control signal; and dynamically adjusting a stress data feature extraction rule to match a real-time stress state according to the relevance between the gradient field update frequency and the temperature adjustment rate. According to the application, dynamic mutual optimization of the annealing stress elimination efficiency and the kiln temperature setting precision is realized, the glass residual stress is reduced, and the hidden danger of plate explosion is eliminated.

The invention discloses a manganin current sampling on-line self-correction method and system of an intelligent fusion terminal. The method and system are applied to the intelligent fusion terminal comprising a manganin diverter assembly. The assembly comprises a working resistor connected in series in a main current loop and a reference resistor for monitoring, the working resistor and the reference resistor are thermally coupled, and the reference resistor does not bear working current during normal sampling. The method comprises the following steps: respectively measuring real-time resistance values of the two resistors in a silent working window period; calculating a current actually measured resistance value ratio; obtaining an ideal resistance value ratio of the two in a stress relaxation-free ideal state; obtaining a correction resistance value ratio variable quantity according to a difference value between an actual measurement ratio and an ideal ratio; and finally, calculating a correction coefficient and updating a sampling channel parameter so as to compensate resistance drift caused by long-term electric thermal stress and realize automatic correction of subsequent current sampling. According to the method, on-line and high-precision self-correction independent of an external reference is realized, and the problem of long-term stress relaxation of a manganese-copper material is effectively solved.

The invention discloses a copper-nickel-silicon alloy strip and a preparation method and application thereof.The copper-nickel-silicon alloy strip comprises, by mass, 1.8 wt%-2.2 wt% of Ni, 0.4 wt%-0.6 wt% of Si, 0.04 wt%-0.12 wt% of Mg, 0.1 wt%-0.2 wt% of Cr, 0.01 wt%-0.03 wt% of P, the mass content of Ni and the mass content of Zn + Sn meet the condition that Ni / (Zn + Sn) is larger than 1.4 and smaller than 2.5, and the balance copper and inevitable impurities; the copper-nickel-silicon alloy strip comprises a second phase, the second phase is mainly composed of Ni2Si and CrSi3, and the size of the second phase ranges from 0.08 micrometer to 0.50 micrometer. The alloy strip has high strength, excellent conductivity and bending performance and good stress relaxation resistance.

An optical component including: a substrate on which an optical element is mounted; a transparent sealing member disposed above the substrate and configured to seal the optical element; and a bonded portion in which a plurality of metal films are laminated, and which is configured to bond the transparent sealing member and the substrate. The bonded portion includes: one or more stress relaxation layers constituted by one or more metal films having a Young's modulus of less than or equal to 150 GPa, the one or more stress relaxation layers having a total thickness of greater than or equal to 1.2 μm; and a diffusion prevention layer disposed on each of both sides in a thickness direction of each of the one or more stress relaxation layers, and configured to prevent diffusion of metal constituting the stress relaxation layer.

The composite terminal comprises a terminal body and a fixing sleeve, the terminal body comprises a welding part, a connecting part and a plugging part, the center of the plugging part is provided with a plugging hole, the center of the fixing sleeve is provided with a mounting through hole penetrating through the front end and the rear end of the fixing sleeve, and the plugging part is inserted into the mounting through hole to be welded and fixed to the fixing sleeve. The mounting through hole is communicated with the inserting hole, and the connecting part and the welding part are arranged on the outer side of the fixing sleeve. The composite terminal is simple in structure and rapid to install, a riveting wire part on the terminal body is omitted, a welding structure is adopted, the appearance of the terminal is simplified, the overall size of the terminal is reduced, a welding connection mode is adopted, the problem of mechanical stress relaxation is avoided, the vibration resistance and impact resistance are higher, and the service life of the terminal is prolonged. Stable transmission of electric signals is facilitated, and poor contact is avoided.

The invention provides a steel aging process numerical simulation method and system.The method comprises the steps that an initial constitutive model of creep fatigue of a to-be-tested steel material is built, and material parameters of the initial constitutive model comprise isotropic hardening parameters, follow-up hardening parameters and viscous stress parameters; the method comprises the following steps: performing a creep fatigue interaction experiment on a to-be-tested steel material at a preset temperature to obtain experimental data under the conditions of preset loading time, constant strain rate and constant strain amplitude, including a cumulative inelastic strain curve, a tensile curve and a stress relaxation curve; constructing a mechanical behavior model of the to-be-tested steel material according to the material parameters, and performing fitting by utilizing an accumulated inelastic strain curve, a tensile curve and a stress relaxation curve to obtain a target constitutive model; and utilizing the target constitutive model to perform aging numerical simulation on the to-be-tested steel material to obtain a change curve of stress along with time. And the aging process of the steel is simulated based on experimental data and a creep fatigue mechanism, so that the accuracy of aging evaluation and life prediction of the steel is improved.

The invention relates to the technical field of material performance test devices, in particular to a low-temperature tensile test device for an insulating material. The problems that an existing low-temperature stretching tool is poor in clamping and fixing effect on an insulating material in the nuclear fusion field, a sample is prone to torsion sliding in a test, stress relaxation is generated, and adaptability is insufficient are mainly solved. According to the technical scheme, the testing device comprises a clamp, a loading controller, a loading rod, a tensile sample, a force sensor, a supporting device, a testing machine reaction frame and a low-temperature environment box; the clamp comprises an upper clamp and a lower clamp; the low-temperature environment box is arranged outside the testing machine reaction frame, and the supporting device is installed outside the low-temperature environment box. According to the test device, stable positive pressure is applied to a sample, torsion sliding and stress relaxation are prevented, it is ensured that the stretching position of the sampled sample is stable and free of errors, the test failure rate is reduced, the qualification rate is increased, the clamp structures are the same, the pressing blocks are detachable, and universality and efficiency are improved.

The present application relates to the technical field of liquid rocket engine nozzle, and discloses a manufacturing method of an extension section of a large-scale liquid rocket second-stage engine nozzle, which is characterized in that the extension section is divided into n cylinder sections according to the size of the plate and the elongation rate of the plate, and each cylinder section is divided into m melon pieces to be prepared by means of tailor welding; the number n of the cylinder sections ensures that the number of the girth welds of the extension section is the least, and the welding of the girth welds is maximally avoided; the cylinder sections of the extension section are obtained by stress relaxation heat correction treatment of preformed cylinder sections, and the uncontrollable welding deformation problem is overcome. The present application solves the problem that the uncontrollable deformation caused by the springback of the sheet metal forming in the block welding leads to the difficulty in guaranteeing the profile tolerance of the inner surface of the nozzle extension section, improves the welding quality, reduces the rejection rate and production cost of the finished product, improves the production efficiency, has a wide application prospect, and any large-diameter thin-walled product can be processed according to the method of the present application.

The present invention relates to: an optical component (10) obtained by bonding a transparent sealing component (14) to a substrate (44) on which an optical element (12) is mounted, thereby sealing the optical element (12); the transparent sealing component (14); the substrate (44); and a method for producing the optical component (10).According to the present invention, each metallized layer (24, 46) that bonds the transparent sealing component (14) and the substrate (44) is provided with: one or more stress relaxation layers (30), each composed of a metal film having a modulus of elasticity of 150 GPa or less and having a total thickness of 1.2 µm or more; and diffusion prevention layers (28, 32) arranged on both sides of the stress relaxation layers (30) in the thickness direction, which prevent the diffusion of a metal from which the stress relaxation layers (30) are composed.

This film comprises an elastomer layer (11) on a base material (30), and the elastomer layer has a stress relaxation rate of 70% or more in at least one direction, as calculated using formula 1. [Formula 1] Stress relaxation rate (%) = (A-B) / A×100 Taking at least one direction as a length direction, the elastomer layer is cut to a length of 10 mm and a width of 30 mm to obtain a strip-shaped test piece. The strip-shaped test piece is pulled in the length direction at a tension speed of 200 mm / min in an environment of a temperature of 25°C and a relative humidity of 45% using a tensile tester, and pulling is stopped when an elongation of 50% is reached. The stress value of the elastomer layer is measured continuously from the start of pulling until 30 seconds after extension has stopped. Defining the stress value indicating the highest stress during the measurement time as "A" (N), and the stress value 30 seconds after extension has stopped as "B" (N), the stress relaxation rate (%) of the elastomer layer is calculated on the basis of formula 1.

An austenitic stainless alloy material that has excellent creep strength and excellent stress relaxation cracking resistance is provided. An austenitic stainless alloy material according to the present disclosure contains, in mass %, C: 0.03 to 0.12%, Si: 0.05 to 2.00%, Mn: 0.05 to 3.00%, P: 0.03% or less, S: 0.010% or less, Ni: 18.0 to less than 25.0%, Cr: 22.0 to less than 30.0%, Co: 0.04 to 0.80%, Ti: 0.002 to 0.010%, Nb: 0.1 to 1.0%, V: 0.01 to 1.00%, Al: 0.001 to less than 0.030%, and N: 0.10 to 0.35%. The number density of precipitates having an equivalent circular diameter of 0.5 to 2.0 μm is 5000 pieces / mm2 or more.

The invention provides a method for analyzing time-history stress relaxation of anchoring force of a pre-stressed anchor cable under high-pressure stress, and relates to the technical field of geotechnical engineering. According to the method, engineering geological investigation, ground stress testing and indoor triaxial rheological testing are systematically combined, a potential high-stress area is accurately recognized, key rheological parameters of a rock-soil body are obtained, and then the stress self-adaptive creep coupling constitutive model with the long-term strength of the rock body as the criterion is constructed; and finally, accurately predicting the time-history creep strain of the rock-soil body and the anchoring force loss of the anchor cable under the high stress condition through numerical calculation. According to the method, the defect that a traditional creep theory describes a nonlinear creep behavior in a high-pressure stress state and a prestress loss coupling mechanism is effectively overcome, and the prediction precision and reliability of mechanical response of an anchoring system are remarkably improved; a basis is provided for long-term stability evaluation and safety control of prestressed anchoring engineering under complex geological conditions, and geotechnical engineering anchoring design and safety early warning are developed towards the refined and intelligent direction.

The present invention provides a laminated structure which is suitable for the manufacture of a printed board and which can suppress peeling of a wiring pattern when a bending stress is applied to the printed board. A laminated structure includes a resin base material and a metal layer provided on a first surface of the resin base material, the resin base material having a recessed portion which opens on the first surface and an inner surface of the recessed portion having a stress relaxation structure, a portion of the metal layer extending into the recessed portion.

The present application relates to a low-emissivity glass and a method for preparing the same. The low-emissivity glass includes a glass substrate, and a barrier layer, a first dielectric layer, a silver-containing functional layer, a first stress relaxation layer, a metal slip layer, and a second stress relaxation layer that are sequentially stacked on the surface of the glass substrate; the first stress relaxation layer includes one or more of zinc aluminum oxide, zinc oxide, zinc tin oxide, and tin oxide, the metal slip layer includes an alloy composed of one or more of nickel, chromium, molybdenum, titanium, niobium, and zirconium, and the second stress relaxation layer includes one or more of zinc aluminum oxide, zinc oxide, zinc tin oxide, and tin oxide. In the present application, by designing the first stress relaxation layer, the metal slip layer, and the second stress relaxation layer on the surface of the silver-containing functional layer, the internal stress of the film layer on the surface of the glass substrate can be released, the influence of the internal stress on the crystallinity of the silver-containing functional layer can be reduced, and thus the crystallinity of the silver-containing functional layer can be improved, and the surface resistance of the low-emissivity glass can be reduced.

The invention relates to a metal material strain rate effect measurement method based on multiple stress relaxation, which comprises the following steps: carrying out a standard quasi-static stretching or compression test on a material sample at a constant strain rate to obtain a stress-strain curve; analyzing a strain range according to a stress-strain curve, and determining a stress relaxation frequency N to be developed and a corresponding relaxation strain value sequence epsilon i, i = 1... N; a material sample is taken to be subjected to a tensile or compression test at a set strain rate, stress relaxation lasts for relaxation time delta t when the strain sequentially reaches values in each relaxation strain value sequence, and after each stress relaxation, the tensile or compression test is performed according to the set strain rate; obtaining a stress-plastic strain rate curve corresponding to each relaxation strain epsilon i; and obtaining a stress-strain curve corresponding to each strain rate. Stress-strain curves corresponding to different plastic strain rates in a quasi-static range can be obtained through a single sample.

The invention relates to the technical field of rubber product processing control, and discloses a control method and system for a sealing ring automatic production line, and the control method for the sealing ring automatic production line comprises the steps: constructing an equipment reference resistance curve in a no-load state; the servo press is controlled to execute a micro-speed steady-state exhaust sequence, and the position locking state is maintained at the closed tail end; calculating a net rheological torque in combination with the reference curve, and extracting a contact displacement drift amount, an in-situ vulcanization rate index and a stress relaxation rate; according to the parameters, the filling stability and the rubber material rheological state are judged, and a process correction instruction is generated. According to the method, physical and chemical characteristics are accurately decoupled from servo torque signals through a micro-speed test and position locking mechanism, closed-loop control over foreign matter risks, filling quality and vulcanization degree is achieved through multi-dimensional parameters, and the problem of quality instability caused by rubber fluctuation in sealing ring production is effectively solved.

The present invention provides an acoustic sensor that can suppress a decrease in sensitivity. [Solution] The device comprises a support body 10, a support region 21a placed on and supported by the support body 10, and a vibration region 22 connected to the support region 21a and capable of vibration, and a vibration unit 20 that outputs a detection signal according to the deformation of the vibration region 22. The support body 10 has a recess 10a formed in the portion facing the vibration region, the vibration region 22 has a portion that is subjected to compressive stress, and the vibration unit 20 has a stress relaxation hole 81.

The invention provides a parallel rheological framework constitutive model parameter calibration method for high-density polyethylene, and the method comprises the steps: obtaining the stress-strain data of a relaxation and rebound test, picking the stress-strain data at the relaxation end moment and the rebound completion moment, and then stripping time-independent elasticoplastic deformation behaviors, thereby achieving the calibration of the parameters of the parallel rheological framework constitutive model. Determining elastic-plastic parameters of the constitutive model of the parallel rheological framework; then, combining curve fitting of axial tension data and elasticoplastic deformation data to ensure that parameters of an elasticoplastic layer of the parallel rheological frame can be really matched with time-independent mechanical characteristics of a sample piece to be tested; and then loop optimization is carried out on viscoelastic layer parameters by using a second-generation non-dominated sorting genetic algorithm, and a simulation result is quantitatively judged through an equivalent root-mean-square error, so that the suitability of the parameters in stress relaxation and creep scenes is ensured, and finally, efficient and accurate calibration of the constitutive model parameters is realized.

The present invention provides an SMA wire material evaluation system and method that simulates real-world application scenarios. This system utilizes a modular load-bearing structure, integrated with an environmental simulation cabin, a data acquisition module, and a control center. A dynamic constraint calculation unit analyzes wire material factory parameters and automatically sets load, temperature rise, and strain thresholds. An interlocking protection unit monitors load, temperature, and strain data in real time. When thresholds are exceeded, a load-temperature coordinated protection mechanism is triggered, simultaneously reducing the load and adjusting the heating power. A closed-loop control unit dynamically adjusts parameters based on stress relaxation characteristics and safety factor mapping tables stored in an adaptive database to ensure that the wire material's residual plastic strain is ≤0.1% and that the microstructure is free of phase transition defects during testing. This system significantly reduces testing equipment costs. Through dynamic threshold constraints and multi-parameter coordinated protection, it achieves high-precision testing while effectively avoiding damage to the wire material's performance, achieving both high efficiency and industrial practicality.

The invention relates to the technical field of gear machining, and discloses an internal gearing powerful gear honing tooth surface residual stress field calculation method based on force-heat coupling. The method comprises the following steps: establishing a honing motion coordinate system to calculate three-dimensional coordinates and relative speed of a contact point, and constructing a three-dimensional to two-dimensional coordinate mapping mechanism; constructing a tooth surface temperature field model based on the relative speed, the correction of heat taken away by cuttings and the point heat source superposition principle; respectively solving mechanical and thermal load stress fields based on the two-dimensional coordinates and the temperature field, and superposing to obtain total elastic stress; and an elastic-plastic constitutive relation and a yield criterion are introduced, stress relaxation calculation is performed through a step-by-step unloading method and a plastic release stress balance equation, and the final residual stress is obtained. The method solves the problems of lack of force-heat coupling mechanism analysis and insufficient stress evolution calculation precision in the prior art, and realizes accurate prediction of the internal meshing gear honing residual stress.

A paste extrusion die comprises a cylinder barrel, a cylinder barrel nut, a sealing ring assembly and a lower die, the cylinder barrel is fixed to the lower die, an extrusion inner cavity of the lower die sequentially comprises a feeding section, a circular deformation section, a stress relaxation section, a film release expansion section, a flat deformation section and a discharging section, and the sealing ring assembly is arranged at the front end of the feeding section. Extrusion cavities in the left die and the right die of the lower die are symmetrically designed; the sealing ring assembly comprises a sealing ring supporting ring, an air bag, an inflation hole and a sealing ring. The air bag is in extrusion fit with the end face of the sealing ring through inflation. According to the extrusion die disclosed by the utility model, the runner between the cylindrical blank body feed port and the flat base band discharge port is integrally designed, and the extrusion inner cavity is designed, so that the flat base band is consistent in density and high in film strength, and the surface quality of the base band is optimized.

This invention relates to a performance testing method for a high-load-bearing, long-stroke air spring assembly, comprising the following steps: S1, determining the model and operating parameters; S2, installation and alignment; S3, air pressure setting; S4, pre-cycle; S5, stretching the air spring; S6, compressing the air spring; S7, unloading and returning; S8, recording deformation data. Before formally recording data, the performance testing method of this invention performs multiple complete compression and rebound pre-cycles on the air spring. This not only eliminates the initial structural stress relaxation of the air spring bladder and cord layer, improving the repeatability and consistency of stiffness testing, but also identifies hidden damage or assembly defects in the air bladder in advance, avoiding sudden failure during formal testing. Furthermore, it allows the rubber material of the air spring to reach a stable hysteresis working state, simulating the actual pre-service break-in process, making the subsequently measured stiffness parameters closer to the true values ​​of long-term stable operation, and thus making the test data more accurate.