267 results about "Hydraulic test" patented technology

The invention relates to the technical field of hydraulic test of nickel alloy pipes, and discloses a hydraulic test system for a thin-wall nickel alloy pipe. According to the system, in the axial loading state of the thin-wall nickel alloy pipe, a closed water pressure cavity is established through an annular sealing clamp, and then strain distribution data on the surface of the pipe body is collected through a distributed optical fiber sensor array. And constructing a three-dimensional stress field reconstruction model based on the acquired strain distribution data, calculating an equivalent plastic deformation threshold value of the pipe body under different water pressure gradients, adjusting a water pressure loading curve slope parameter according to the equivalent plastic deformation threshold value, and generating a dynamic water pressure loading instruction. And the high-frequency pressure pulse generator executes the instruction, synchronously triggers the X-ray diffractometer to collect lattice distortion data of the tube body, inputs the data into the material microscopic damage evolution model, and outputs a microscopic defect spatial distribution map. And finally, material constitutive parameters of the three-dimensional stress field reconstruction model are corrected based on the atlas, closed-loop feedback control is formed, and multi-dimensional data acquisition and accurate management and control of the thin-wall nickel alloy pipe hydrostatic test are achieved.

The invention discloses a method for calculating an internal water pressure rejection threshold value of a disc type suspension porcelain insulator, which comprises the following steps of: (1) extracting n samples of the porcelain insulator, performing a destructive internal water pressure test, and sorting the water pressure values of the damaged samples from small to large; (2) estimating a probability value of the destroyed water pressure to obtain a data set of a destroyed sample; (3) products with the proportion of the first k% destroying water pressure are set as defective products, the first k% of data are removed from the data set D0, and a data set Dk of qualified products is obtained; (4) calculating the saliency Pr (k) of the data set Dk of the qualified products; (5) selecting different k%, repeating the step (3) and the step (4), calculating corresponding Pr (k), and finding out kbest; and (6) calculating a water pressure rejection threshold value Sth selected on the production line. According to the method, inferior-quality products and qualified products are divided according to the saliency of Weibull distribution fitting correlation coefficients, and the rejection threshold value of the water pressure test in the disc type suspension porcelain insulator is determined. According to the method, defective products are scientifically removed, and the quality of outgoing products is improved.

The invention discloses a system and method for testing flow, displacement and hydraulic power of a main valve element. The system comprises two displacement sensors, a tested balance valve and a hydraulic testing assembly. A main valve core and a pilot valve core of the tested balance valve are coaxially and oppositely arranged; the two displacement sensors are coaxially fixed with the main valve core and the control piston respectively; the hydraulic test assembly detects the pressure of an oil return port A, a load oil port B, a feedback spring cavity pressure measuring port Pc and a pilot oil inlet X through pressure sensors; the load pressure, the pilot pressure and the oil return back pressure are controlled through a main load oil way, a pilot control oil way and an oil return back pressure oil way respectively, and meanwhile the flow of the oil return is measured through a flow meter. According to the invention, the flow, displacement and hydraulic force of the main valve core under different working conditions can be synchronously and dynamically measured.

The invention belongs to the technical field of hydraulic test and intelligent control, and particularly discloses a hydraulic component test system integrating data acquisition and automatic data analysis functions, which comprises a physical hardware test platform, a test control software platform and a digital twinborn model of a tested component, and realizes real-time interaction through an OPC UA protocol. Model parameters are corrected on line by means of measured data, and steady state, transient state and disturbance working condition tests are automatically executed based on a working condition library; and dynamically optimizing a test sequence in a test process, skipping a redundant working condition or encrypting a critical region, and synchronously generating a structured performance report. The accuracy and consistency of test results are improved, working condition simulation signals are automatically generated, performance data are collected in real time, a comprehensive performance report is generated, manual operation is reduced, the test process optimization unit can skip redundant working conditions and refine failure boundary positioning, and the test time and cost are effectively saved.

The invention relates to the technical field of hydraulic control one-way valve testing, and discloses a hydraulic control one-way valve testing method which is used for solving the problem that the real performance of a hydraulic control one-way valve under actual complex working conditions is difficult to comprehensively reflect due to the fact that an existing testing method is single in working condition, insufficient in data acquisition dimension and lack of dynamic modeling capacity. A programmable working condition loading module is introduced, a hydraulic test environment with dynamic characteristics is constructed according to a pressure and flow change curve in practical application, and high-precision and multi-dimensional synchronous acquisition of the whole opening and closing process of the hydraulic control one-way valve is realized by combining a high-frequency displacement sensor, a micro-flow sensor and a vibration sensing unit; according to the scheme, the defect that a traditional testing method is difficult to restore the real dynamic working condition is effectively overcome, the authenticity of valve performance testing and the detail integrity of response data are remarkably improved, and powerful support is provided for accurately evaluating the dynamic behavior of the hydraulic control one-way valve under the complex working condition.

The invention relates to the technical field of ship and ocean engineering, and discloses a method for installing an integral uncoupling tube on ship and ocean engineering, which comprises the following steps of: modular design and factory preassembly, dividing the integral uncoupling tube into a main shaft tube module, a sealing module, a guide module and an interface module, performing standardized flange design on each module interface, and assembling the main shaft tube module, the sealing module, the guide module and the interface module. The interface machining precision is controlled within 0.02 mm, sealing assembly preassembling, guiding device debugging and module calibration are completed in a factory, air pressure testing and hydraulic testing are conducted on all modules, and interface position data are recorded; module hoisting and hydraulic guide positioning are conducted, specifically, all the modules are hoisted to the installation positions, the modules are controlled to move through a hydraulic guide device, and coarse positioning of the modules is achieved. Through the modularized preassembling and intelligent mounting technology, the mounting efficiency is remarkably improved, and on-site construction steps are simplified; the laser centering and hydraulic correction technology is adopted, high-precision installation is achieved, and stable and reliable operation is guaranteed.

The invention provides a large-inertia closed system inertia load hydraulic test bench, which comprises a driving system, a closed system and an inertia loading system, the driving system comprises a driving motor, the closed system comprises a closed pump and a closed system motor, the inertia loading system comprises an inertia loading loop, and the closed system comprises a closed pump and a closed system motor. The inertia loading loop comprises a loading motor, a proportional servo valve, an energy accumulator, a first one-way valve, a second one-way valve, a back pressure valve, a third one-way valve, a fourth one-way valve, an overflow valve and a fifth one-way valve. The test bed is mainly constructed by adopting hydraulic components, a large-inertia closed system can be moved to a hydraulic related test bed to carry out normal working condition and inertia load tests, so that the related closed system is tested and optimized, the overall performance of large-inertia equipment is improved, the research and development period is shortened, and the test bed is low in test cost, safe, reliable, small in size and easy to popularize. Related test beds do not need to be specially customized, the loading control mode is simple, different-flow closed system inertia load tests can be carried out, and adaptability is high.

The utility model discloses a drill rod drainage device for a hydraulic test, which comprises a valve body, one end of the valve body is connected with a drill rod, the other end of the valve body is connected with a hydraulic test device, the valve body is provided with a central through hole along the axial direction of the drill rod, and the valve body is also provided with a drainage hole communicated with the central through hole; when a hydraulic test is carried out, the leakage preventing piston is clamped in the center through hole of the valve body to prevent water in the drill rod from flowing out of the water drainage hole, a center water path with one end communicated with the drill rod and the other end communicated with the hydraulic test device is further arranged on the leakage preventing piston, and the water in the drill rod flows into the hydraulic test device from the center water path during the hydraulic test; and after the hydraulic test is finished, the leakage preventing piston is pulled out, and water in the drill rod flows into the drill hole from the central through hole and the drainage hole. According to the utility model, the purpose of quick drainage and pressure relief after the deep drilling hydraulic test is completed can be achieved, and the difficulty and risk of drill lifting are reduced.

The invention relates to a rotary steering hydraulic test system, and relates to the technical field of pressure testing, through cooperation of a base mechanism and an inclination mechanism, a test cylinder assembly can be inclined at various angles, then the device can detect the output pressure of a hydraulic control system in an inclined state, the detection of the device is not single any more, and the detection efficiency is improved. Through cooperation of an inclination mechanism and a storage mechanism, an air cylinder in the inclination mechanism is used for providing power for rotation of a first two-way screw in the storage mechanism, a mechanism in the storage mechanism is changed, a water pipe port is opened, and then a cleaning agent can be fed into the testing cylinder assembly; a cleaning agent is matched with the hydraulic test system to operate to clean the interior of the hydraulic test system, residual hydraulic oil is cleaned away, then the hydraulic control system is taken out easily, transferring and follow-up mounting of the hydraulic control system are facilitated, meanwhile, the storage mechanism changes power from the base mechanism and the inclination mechanism, and the structure of the storage mechanism is simpler.

The invention discloses a modularized hydraulic system testing system and method, and relates to the technical field of hydraulic testing, and the method comprises the following steps: S1, collecting outlet pulsating pressure signals of a high-pressure plunger pump and a low-pressure vane pump by adopting a nanosecond-level synchronous time mark system, generating a phase residual error map, and calculating a phase residual error map of the outlet pulsating pressure signals of the high-pressure plunger pump and the low-pressure vane pump; the hidden resonance risk is preliminarily judged through frequency drift and amplitude gradient calculation; and S2, on the basis of the synchronous acquisition base line, carrying out cross spectrum coherence degree calculation and phase difference time sequence analysis on the pulsating pressure sequence, identifying a frequency dislocation anchor point, generating a pump source pulsating interference fingerprint, and determining a time window of recessive resonance. According to the method, real-time identification, dynamic intervention and closed-loop control of recessive resonance in the hydraulic system are realized through nanosecond-level synchronous acquisition, phase conjugate inversion and frequency dislocation traction strategies, energy coupling caused by frequency dislocation is effectively avoided, the operation stability and safety of the system are improved, and the service life of equipment is prolonged.

The invention relates to the technical field of nickel alloy pipe water pressure detection, and discloses a thin-wall nickel alloy pipe inner wall water pressure test detection system and method. The method comprises the steps that a closed water pressure environment is established in a pipe, a preset pressure gradient is applied, and pipe wall deformation response data are collected through a distributed sensing array; and generating a composite feature matrix containing axial strain, circumferential stress and radial displacement features through multi-dimensional feature extraction, inputting the composite feature matrix into a material performance degradation evaluation model, and simulating microstructure change to output a potential defect distribution map. Dynamically adjusting the water pressure gradient and the pressure maintaining time according to the map, executing a secondary water pressure test, and capturing a microscopic deformation sequence image through high-frequency imaging; comparing the image with a model prediction result identification deviation value, and iteratively updating a model parameter to optimize a detection threshold value; the test is completed by optimizing the threshold value, qualified pipe section marks and defective pipe section positioning coordinates are output, and the comprehensiveness and accuracy of thin-wall nickel alloy pipe inner wall defect detection are improved.

The invention discloses a fractured rock mass hydraulic pressure test and array electrode monitoring and detecting device and a using method, and relates to the technical field of hydraulic engineering geological investigation, the fractured rock mass hydraulic pressure test and array electrode monitoring and detecting device comprises an upper plug and a lower plug arranged below the upper plug, a floral tube is fixedly arranged between the lower plug and the upper plug, and a water pump pipe is arranged on the upper plug; the upper plug and the lower plug are both sleeved with sealing air bags, an air pumping assembly is arranged above the upper plug, the portion, above the lower plug, of the floral tube is sleeved with an air guide ring, an electromagnetic valve is arranged between the air guide ring and the air conveying pipe, and a pneumatic telescopic assembly is arranged at the air outlet end of the air guide ring. A conductive wire is wound on the outer side of the floral tube, a waterproof sealing cylinder is arranged on the conductive wire, an electrode bar is arranged in the waterproof sealing cylinder, and a waterproof sealing assembly is arranged on the side, away from the floral tube, of the waterproof sealing cylinder. And the spatial distribution of the pressurized water area fracture system is inverted.

The invention relates to a semi-closed performance test system for a hydraulic turbine pump of a liquid rocket engine. A turbine inlet of the hydraulic turbine pump is connected with an outlet of a centrifugal pump through a turbine inlet pipeline, and an inlet of the centrifugal pump is communicated with a water pool; a pump inlet of the hydraulic turbine pump is connected with an outlet of the water container through a pump inlet pipeline, and a pump outlet of the hydraulic turbine pump is connected with a liquid inlet of the water container through a pump outlet pipeline; the gas distribution table is connected with a gas inlet of the water container through a gas distribution pipeline; a liquid discharge port of the water container is connected with a discharge pipeline; the discharge pipeline, the pump outlet pipeline, the pump inlet pipeline and the turbine inlet pipeline are each provided with a flowmeter, a stop valve and an adjusting valve. And pressure sensors are arranged at a turbine inlet, a pump inlet and a pump outlet of the hydraulic turbine pump. The device has the capabilities of conveying a high-pressure water medium of a liquid flow test system, testing the performance of a hydraulic test system, maintaining the liquid level of a discharge system to be constant and the like, so that the overall performance test requirement of the hydraulic turbine pump can be met.

The invention relates to the technical field of research of reactor fuel irradiation, in particular to a fuel power calibration method for a loop irradiation test, which comprises the following steps: carrying out an out-of-reactor hydraulic test, and establishing a high-precision CFD (computational fluid dynamics) model of a fuel loop irradiation device based on a hydraulic test result; calculating the gamma heat release rate ratio of each material and the total heat release in the test section, and preliminarily determining the nuclear power value of the fuel assembly; based on the heat conduction differential equation and the convective heat transfer equation, the gamma heat release rate of the material and the nuclear power value of the fuel assembly are corrected; repeating the calculation process of S3 until the nuclear power value of the fuel assembly converges, and obtaining the final theoretical calculation value of the gamma heat release rate of each material and the nuclear power of the fuel assembly; and further verifying the calculation result to finally obtain the nuclear power of the fuel core body, and obtaining the burnup of the fuel assembly in the irradiation test through time integration. The method aims to solve the technical problem that the nuclear power of the fuel assembly calculated based on thermotechnical measurement data in a loop irradiation test has deviation compared with an actual value.

The invention belongs to the technical field of slide valve pair zero-zone micro-scale static characteristic testing, and provides a slide valve pair zero-zone micro-scale static characteristic high-precision test bed and a test method.The slide valve pair zero-zone micro-scale static characteristic high-precision test bed comprises an ultra-precision slide valve pair mounting table and a slide valve pair static characteristic hydraulic testing system; by selecting a control element and a detection element which can measure and control the flow, the pressure and the temperature in a high-precision and precise manner, and combining an innovatively developed test subprogram, an intelligent data processing algorithm and a test model machine learning algorithm, the measurement precision, the test result confidence coefficient and the measurement efficiency are improved; according to the test bed, based on a hydraulic test system for the micro-scale static characteristics of the zero region of the slide valve pair, a control element and a detection element which can measure and control the flow, the pressure and the temperature in a high-precision and accurate manner are carefully selected, and the micro-scale static characteristic measurement under different flow, pressure and temperature of the zero region of the slide valve pair can be comprehensively and accurately simulated.

The invention discloses a high-flow hydraulic system, which relates to the technical field of hydraulic test systems and comprises a hydraulic oil tank, a water cooling system, a high-pressure oil source pump group, a pressure control valve group, a high-pressure energy accumulator group and a converging valve group, the high-pressure energy accumulator set comprises a plurality of energy accumulator units, and each energy accumulator unit comprises a leather bag type energy accumulator. The output end of the leather bag type energy accumulator is communicated with the energy accumulator stop valve through a pipeline; the traditional flow limitation is broken through through the cooperative energy supply mechanism of the high-pressure energy accumulator set and the multiple pump sets, and under the steady-state working condition, the high-pressure oil source pump set maintains basic flow output; when the detection system triggers the large-flow requirement, the confluence valve group starts the electromagnetic valve group to achieve synchronous energy supply of the energy accumulator group and superposition of output of the pump group to form larger instantaneous flow, and the design enables the system to continuously execute short-time large-flow hydraulic pulse test and meet the large-flow hydraulic test requirement.

The invention discloses a hydraulic test system and method for an electro-hydraulic servo element. The system comprises a rack, and an oil tank assembly, a power module, a hydraulic module, a loading module, a feedback module and a main control module which are arranged on the rack. The hydraulic module realizes accurate control of pressure and flow, and provides stable hydraulic control support for the tested element. The loading module is connected with a one-way valve and an overflow valve through a flow channel in the second integrated block to form a bridge circuit channel of the loading oil cylinder, so that loading and oil supplementation of the loading oil cylinder are realized, and the load test requirement is met. The power module provides stable hydraulic oil for the tested element and the loading oil cylinder through the oil supply unit and the oil supplementing unit. And the feedback module adopts a tension and pressure sensor, a follow-up piston displacement sensor and a valve core position sensor to directly acquire the valve core position, force and displacement data of the tested element, so that the interference of closed-loop test is avoided. According to the system, through modular design and accurate control, multiple test requirements of the electro-hydraulic servo element can be met.

The invention relates to the technical field of hydropower station pressure steel pipe detection, in particular to a hydropower station steel branch pipe differential graded loading and unloading hydrostatic test method, system and equipment and a storage medium. The hydraulic test process is scientifically divided into a low-pressure stage, a medium-pressure stage and a high-pressure stage, differentiated boosting amplitude and speed control strategies are adopted in the different stages, the technical limitation of a traditional uniform graded boosting method is broken through, and an innovative control mode of low-pressure fast rising and high-pressure slow rising is achieved. The large boosting amplitude and the high boosting speed are adopted in the low-pressure stage, the bearing allowance of the steel branch pipe in the elastic deformation stage is fully utilized, and the test efficiency is remarkably improved; and in the high-pressure stage, the small pressure increasing amplitude and the slow pressure increasing speed are adopted, the sensitive characteristic when the steel is close to the yield strength is effectively adapted, and the local stress concentration and plastic deformation risks are avoided.

The invention discloses a digital twinborn body and a digital twinborn method for a hydraulic test system of a turbine pump of a liquid rocket engine, and solves the technical problem of high production and test resource consumption caused by research and development of engine products. The basic architecture of the digital twinning body comprises a digital twinning engine, a physical entity and a digital virtual body, and dynamic unification of digital virtual body prediction performance and object actual measurement performance is realized through virtual-real interaction and model training and optimization; finally, the display effect that a digital virtual body completely replaces a liquid rocket engine turbine pump hydraulic test system entity can be achieved, and the contradiction between increasing turbine pump hydraulic test tasks and limited physical test resources is greatly relieved.

The utility model relates to the technical field of nuclear power stations, and provides a heating assembly and a heating system for a hydraulic test of a nuclear power station. The heating assembly comprises a flexible heating body, a protective layer and a heat preservation layer, wherein the protective layer and the heat preservation layer are arranged on the two opposite sides of the flexible heating body respectively. The heating system for the hydraulic pressure test of the nuclear power station comprises a nuclear reaction device and a heating assembly, and the heating assembly is configured to be attached to the outer surface of the nuclear reaction device. The heating assembly is directly attached to the metal outer surface of the nuclear reaction device, the metal is directly heated in a heat conduction mode and can be electrified at any time, and the heating period is effectively shortened; the flexible heating body can be tightly attached to the outer surface of the nuclear reaction device, so that the contact area can be increased, and the heat loss during heating can be reduced; the protective layer can improve the pulling resistance of the whole heating assembly and reduce contact abrasion; the heat preservation layer can reduce loss of heat generated by the flexible heating body to the air, and the heating efficiency is improved.

The invention provides a medium isolation type pressure conversion device. The medium isolation type pressure conversion device comprises a first sealing flange and a second sealing flange which are oppositely arranged; two ends of the limiting rod are fixedly connected with axial end surfaces of the two sealing flanges; the metal isolation flange is arranged between the two sealing flanges and is in sliding connection with the limiting rod; the first corrugated pipe mechanism is connected with the first sealing flange and the isolation flange to form a first medium space; the second corrugated pipe mechanism is connected with the isolation flange and the second sealing flange to form a second medium space; a pressure receiving end for transmitting a first medium is arranged outside the first sealing flange; the outer side of the second sealing flange is provided with a liquid supplementing port for supplementing the second medium, and the pressure output end outputs pressure to the to-be-tested piece. Pressure source equipment drives the first corrugated pipe to axially extend to push the isolation flange to move, the limiting rod restrains the total length to force the second corrugated pipe to be shortened, static sealing isolation type conversion of two pressure media is achieved, and the problem that in a hydraulic test, the pressure media of the pressure source equipment are not compatible with the pressure media of a to-be-tested piece is solved.

The utility model discloses an ignition oil pipe hydraulic testing device which comprises a manual hydraulic pump, a compound connector and a hydraulic pressure gauge, the compound connector is respectively connected with the manual hydraulic pump, the hydraulic pressure gauge and a high-pressure oil pipe to be tested, and the two ends of the high-pressure oil pipe to be tested are respectively and fixedly connected with a combined connector. According to the utility model, the connection relationship among the test equipment is simplified through the compound connector with a plurality of connecting ends, the connection relationship among the equipment is further optimized by cooperating with the combined connector, the operation is simple, and the later maintenance management is facilitated.

The invention discloses a valve test protection device, belongs to the technical field of valve tests, and aims to solve the problem that an overpressure explosion risk exists in a water pressure strength test of an existing valve. A valve test protection device comprises a connecting piece, a shell, a valve head and a pressing rod, the shell is a hollow component with a lower opening, the upper portion of the connecting piece is in threaded fit with the lower opening of the shell, a medium inlet hole and a medium discharging hole are formed in the connecting piece, the valve head is located in the shell and opens or seals a medium inlet, and a sinking groove is formed in the upper end face of the valve head. The lower end of the pressing rod abuts against the groove bottom of the sinking groove, the upper end of the pressing rod penetrates through the top wall of the shell, the pressing rod is sleeved with a disc spring assembly, the upper end of the disc spring assembly abuts against the top wall of the shell, and the lower end of the disc spring assembly abuts against a shaft shoulder structure at the bottom of the pressing rod. When the pressure of the water pressure test equipment is increased to the relief pressure, the pressure of the medium water is relieved through the device, and the valve shell explosion caused by overpressure in the valve water pressure strength test is avoided.

The utility model discloses a special water pressure test blocking plate for a steel skeleton composite pipe, which comprises a steel skeleton composite pipe body with a pipe wall thickening section at the end part, and a blocking plate for blocking the end part of the steel skeleton composite pipe body is arranged at the end part, close to the thickening section, of the steel skeleton composite pipe body. The peripheral face of the steel skeleton composite pipe body is sleeved with a locking sleeve piece making contact with the thickening section, and the locking sleeve piece and the blocking plate are connected through a plurality of fastening sleeve pieces. The tool is simple in structure, fast to manufacture and convenient to use, the tool can be recycled, the blocking plate can be fixed to the end of the steel skeleton composite pipe body through mutual matching of the locking sleeve piece and the fastening sleeve piece, and meanwhile follow-up replacement of the blocking plate is facilitated.

The invention provides a pump valve shaft seal water hydraulic pressure test detection device which comprises a box body, a partition plate is fixed in the box body, an opening is formed in the partition plate, a movable plate is movably installed in the opening, a displacement mechanism and a positioning column are fixed to the movable plate, a positioning pipe is movably installed at one end of the positioning column, and the other end of the positioning pipe is provided with a clamping groove. The positioning pipe and the displacement mechanism are both fixed to the side of the box body, a pushing mechanism is fixedly installed on the side of the box body, fixing assemblies are installed on the pushing mechanism, a valve body is movably installed between the fixing assemblies, a cavity is formed in the box body, and the valve body is movably installed in the cavity. During use, before the pump body is installed, the ring seat drives the fixed pipe to move, the fixed pipe provides a required space for installation of the valve body after moving, the ring seat and the fixed pipe enter one end of the valve body in the later period, the valve body is limited and supported through the fixed pipe, and the movable seat moves in the later period to extrude and fix the valve body between the fixed seats; and air enters the fixed pipe at the later stage, and the elastic seat deforms to be in contact with the valve body for sealing during air intake.

1. The name of the design product: hydraulic comprehensive test bench. 2. The use of the design product: the design product is used for the hydraulic circuit lapping of pump body and valve body and hydraulic test. 3. The design points of the design product: in shape. 4. The picture or photo that can best show the design points: perspective view.

The utility model relates to the technical field of back walls, in particular to an underlying turnover type pipeline hydraulic pressure test back wall which comprises a steel plate box, the steel plate box is arranged on the ground, the top end of the steel plate box is open, a weight reduction groove is formed in the middle of the steel plate box, I-shaped steel is connected into the weight reduction groove, and the I-shaped steel is connected with the top end of the steel plate box. The steel plate box is filled with concrete, the surface of the steel plate box is provided with an auxiliary pushing side wall and an auxiliary supporting side wall, the auxiliary pushing side wall and the auxiliary supporting side wall are oppositely arranged, the auxiliary pushing side wall is connected with a plurality of auxiliary pushing pieces used for abutting against a pipeline, and a plurality of auxiliary supporting pieces used for supporting the steel plate box are arranged between the auxiliary supporting side wall and the ground. The utility model has the effect of reducing the cost consumption of the pipeline hydrostatic test.

The invention relates to the technical field of hydraulic sealing, in particular to an O-shaped ring service life prediction method suitable for an extremely low temperature environment, and the method comprises the steps: carrying out the uniaxial tensile test of an O-shaped ring material in the extremely low temperature environment, and obtaining a stress-strain curve; establishing an O-shaped ring sealing structure model, and simulating and analyzing the mechanical properties of the O-shaped ring at extremely low temperature to obtain the relationship between the maximum contact stress and the compression ratio of the sealing surface of the O-shaped ring; and a dynamic seal friction wear hydraulic test bed is built, and the relation between the quality of the O-shaped ring and time is obtained. And based on a maximum contact stress criterion, coupling simulation and friction wear test results, and obtaining a life prediction result of the O-shaped ring. The method comprehensively considers the influence of temperature, pressure and medium on the O-shaped ring in the extremely low temperature environment, effectively improves the problem that the existing life prediction method cannot accurately reflect the failure mode of the O-shaped ring material under the extremely low temperature condition, and improves the accuracy of life prediction.

The application discloses a kind of main valve core flow, displacement, hydraulic force test system and test method, comprising: two displacement sensors, the balanced valve to be measured, hydraulic test component;The main valve core of the balanced valve to be measured and the pilot valve core are coaxially arranged oppositely;Two displacement sensors are respectively fixed with main valve core, control piston coaxially;Hydraulic test component detects the pressure of return oil outlet A, load oil port B, feedback spring cavity pressure measuring port Pc, pilot oil inlet X by each pressure sensor;And by main load, pilot control, three oil circuits of return oil back pressure, load pressure, pilot pressure and return oil back pressure are controlled respectively, while return oil flow is measured by flowmeter simultaneously.The application can synchronously dynamically measure the flow, displacement and hydraulic force of main valve core under different working conditions.

The invention discloses a rotary joint hydraulic test system and a control method, and the control method comprises the steps: connecting a first hydraulic joint and a second hydraulic joint on a tested piece through a hydraulic test system, and supplying high hydraulic pressure and low hydraulic pressure to the first hydraulic joint and the second hydraulic joint respectively; then the first hydraulic connector and the second hydraulic connector are driven to rotate to one end value in a rated angle range at a low speed through a hydraulic driving system, the pressure is relieved to zero after the hydraulic values are maintained, and then the supplied hydraulic values of the first hydraulic connector and the second hydraulic connector are alternated; the first hydraulic connector and the second hydraulic connector are driven to rotate to the other end value of the rated angle range, a complete hydraulic test cycle is formed, durability tests of the first hydraulic connector and the second hydraulic connector are achieved through multiple cycles, optimization of sealing type selection of the rotating connector is facilitated, and reliability of the rotating connector is improved.