57 results about "Bulge test" patented technology

The invention aims at providing a volumetric capacity-variable constant-pressure maintenance device of a pressure vessel. The volumetric capacity-variable constant-pressure maintenance device comprises a pressurization system, a pressure vessel system and a volumetric capacity-variable constant-pressure maintenance system which are sequentially connected, wherein the pressurization system comprises a water tank and a pressure test pump; the pressure vessel system comprises a pressure vessel, and the pressure test pump is respectively communicated with the water tank and the pressure vessel; and a one-way valve is mounted between the pressure test pump and the pressure vessel, a pipeline communicated with the water tank is arranged between the pressure test pump and the one-way valve, an overflow valve is mounted on the pipeline, and the pressure vessel is communicated with the volumetric capacity-variable constant-pressure maintenance system. The volumetric capacity-variable constant-pressure maintenance device has the advantages that the occupied space is small, the bulge test of tested equipment by the pressure vessel is realized; the magnitude of pressure in the pressure vessel cannot change along with the volumetric change of the tested equipment; the change of volumetric capacity is realized through the movement of a piston, and accurate regulation can be performed; a close-loop control circuit is constituted, the pressure regulation speed is quick; and accurate constant pressure can be realized through the volumetric capacity-variable constant-pressure maintenance system; and the volumetric capacity-variable constant-pressure maintenance device is simple to operate and convenient to use.

The invention discloses a time-based sheet forming limit determination method and belongs to the technical field of stamping processes. The time-based sheet forming limit determination method comprises the following steps: establishing a steel ball die bulging test; performing the steel ball die bulging test on a sheet material, and shooting a bulging sample until the sheet material is broken; obtaining a previous frame of image of the sample which is just broken according to a shot photo, taking a breaking point as a center, and selecting a region near the part close to the breaking point as an inspection region; obtaining primary and secondary surface strain mean values of the inspection region; performing calculation to obtain primary thickness direction strain and thickness direction strain rate; and obtaining data at stable and instable stages according to the thickness direction strain rate, and comparing the data at stable and instable stages to obtain a forming limit point. The time-based sheet forming limit determination method is capable of really determining limit strain of just happened tightening or cracking to fully reflect in-situ deformation situation of an inspection point.

The invention discloses a method for measuring sheet metal deformation based on images, which adopts a multi-axis rotation and lifting structure, a CCD camera, an optical lens, and an image and data processing computer. The images of a sheet metal before and after deformation are shot and stored in the image and data processing computer to form data files; and a forming limit diagram and parameter information are acquired through a bulging test and a tension test respective to form standard data files. The method can store and analyze material performance in various aspects so as to screen spare sheet metals from various aspects.

The invention aims to a construction method for mounting a front-end capillary tube heat exchanger of a subway tunnel heat pump. The construction method comprises the following steps: (1) checking whether a waterproof layer is damaged and whether the waterproof layer meets the mounting standard; (2) determining a laying position of a capillary tube network; (3) fixing a tube clamp and a capillary tube module; (4) enabling a water supplying and returning tube of the capillary tube to be in hot-melt connection with a water collection main pipe; (5) carrying out bulge test of the capillary tube; and (6) hiding the capillary tube and carrying out structure construction of a surrounding rock secondary lining, a water retaining plate and a primary lining by construction units. Compared with the prior art, through the process steps, the situation that the capillary tube is used as a front-end heat exchanger and is constructed in subways is solved; the method is simple, and is convenient to implement, rapid in construction progress, high in possibility of guaranteeing construction quality and excellent in construction effect.

The invention discloses a method for evaluating the sensitivity of an edge crack of a high-strength thin steel plate, belonging to the technical field of thin steel plate formability indexes. The method comprises the following steps: firstly, establishing a steel ball die bulging test; then performing the steel ball die bulging test on a test sample in a one-way tensile strain state; then, carrying out edge milling on the edges of the test sample and polishing to remove burrs to obtain a standard test sample; afterwards, performing the steel ball die bulging test on the standard test sample to obtain a surface main strain value of a part in which necking just appears; trimming a plate, and carrying out steel ball die bulging on the sample, thereby obtaining a surface main strain value of a part, in which cracking just appears, of the sample; and finally, comparing the surface main strain value of the part, in which necking just appears, of the standard test sample with that of the part, in which cracking just appears, of the sample, thereby judging the sensitivity of the edge crack of the steel plate. The sensitivity of the edge crack of a material can be accurately evaluated by the method provided by the invention.

The invention discloses a hyperbaric cabin device for an external pressure test of a pressure container model. The hyperbaric cabin device mainly comprises a hyperbaric cabin barrel, an annular pressure container fixing disc, an annular hyperbaric cabin cover and a protective cover which are coaxially arranged from bottom to top. The device can carry out an external bulge test on the pressure container model. The device can conveniently measure the strain of the inner wall of the pressure container model, the leakage problem caused when watertight sensing parts, sealing rings and the like are adopted for strain measuring in the prior art is avoided, in this way, the inner wall of the pressure container model directly makes contact with the exterior, further expansion can be achieved on the basis, and multiple kinds of data, such as pressure, temperature and displacement, needed for tests are measured; the protective cover can protect testers during conquassation of the pressure container model, and the hyperbaric cabin device with multiple pressure grades can be obtained by designing the structural sizes of the cabin barrel, the cabin cover, bolts and nuts.

The invention discloses a caulking construction method for a PCCP connector. The caulking construction method includes the physical recovery and repair process and a double-component polysulfide sealant repair process. Large water delivery projects adopting PCCPs are increased day by day, and PCCP prestress concrete pipes of the large water delivery projects have beneficial effects not capable of being replaced by other concrete, wherein the beneficial effects mainly include the large pipe diameter, the long laying distance and the like. While for the prestress concrete pipes, in the construction process, pipe seam connection becomes the key link of the project quality. It is found in the third-time bulge test conducted on the connector after pipeline backfilling that the phenomenon that the pressure value is decreased happens to part of prestress concrete pipeline connectors, and the design requirement is not met. If pipe replacement is conducted and backfilling is conducted again, cost is high and the process is complex. The caulking construction method for the PCCP connector is put forward, and the situation that the third-time bulging is not qualified is eliminated. Cost is saved, operation is easy, and the pipe opening quality is reliable after caulking.

The invention relates to a seal and bulge test device of a shell of a gas flow meter, which consists of a pedestal, a ring support, a clamp and two compaction bowls, wherein the ring support is vertically and fixedly arranged on the upper surface of the pedestal, the ring support is provided with radial air inlets, and two lateral surfaces of the ring support are provided with mounting ring tables axially clamped inside an open end of a work piece; two end parts of a clamp are oppositely provided with top cores respectively, wherein at least one top core is an axially adjustable; the lateral surfaces of the two compaction bowls are provided with positioning centers; and the clamp can clamp and arrange the work pieces at two sides of the ring support through the two compaction bowls. The test device has the advantages of scientific and reasonable structure design, simple operation, convenient use and low cost, and can effectively reduce the labor intensity of sealability test of the shell of the gas flow meter, improve seal and bulge test efficiency and simultaneously ensure the test accuracy; and the seal and bulge test device has higher innovation and is suitable for popularization and application.

The invention discloses a method for machining an inner container of a water heater by using resin. The resin inner container is provided with a water inlet, a water outlet and a sensor port, and a flange connecting port is formed in the end of a shell. The method comprises the following steps that a flange component, a water inlet composite pipe, a water outlet composite pipe and a temperature sensor port pipe are formed through injection molding; the water inlet composite pipe, the water outlet composite pipe and the temperature sensor port pipe are placed in a forming mold of the resin inner container to be positioned and fixed; the resin inner container is formed in a blow molding mode; the flange component is connected with the resin inner container; the water inlet and the water outlet of the resin inner container, the flange connecting port and an outer connecting port of a temperature sensor are sealed tightly, and the preset pressure is adopted for the sealing bulge test; theouter surface of the resin inner container is activated to form a relatively rough anti-skid surface; a reinforcing material for increasing the stress strength of the resin inner container is wound around the outer surface of the resin inner container; the reinforcing material is solidified; and the sealing performance is detected through the bulge test. According to the inner container prepared through the method, the overall strength is high, the structural stability is good, and the use is safe and reliable.

The invention relates to the field of metal material mechanical property testing, and provides a micro specimen and a hydraulic bulge testing method.The micro specimen comprises a specimen body which is a sheet body.A direction marker is arranged on the surface of the specimen body and is in or opposite to the bending direction of the specimen body.The influences of initial deformation of the micro specimen on testing results can be reduced, and the accuracy of hydraulic bulge testing results is improved.

The invention relates to a novel hydraulic bulging test clamp. The novel hydraulic bulging test clamp comprises an upper clamp, a lower clamp, an upper sleeve and a lower sleeve, the lower sleeve is provided with a first through hole, the upper sleeve is provided with a second through hole, and an inwardly-extending mounting chamber is arranged at the upper part of the lower clamp; an oil fillingchannel, a first oil leakage channel and a second oil leakage channel which extend inwardly and communicate with the mounting chamber are arranged in the side surface of the lower clamp; and the lowersleeve is mounted at the bottom of the mounting chamber, the upper sleeve is mounted at the upper part of the mounting chamber, the central axis of the second through hole and the central axes of thefirst through hole are on the same straight line, and the upper clamp is fixedly mounted above the lower clamp. The novel hydraulic bulging test clamp has the advantages of low loss of hydraulic oil,short clamp cleaning time, convenience in installation, high measurement precision and high safety.

The invention discloses a short straight metal pressure pipe fitting bulge test apparatus, which belongs to the field of a machinery apparatus. The short straight metal pressure pipe fitting bulge test apparatus comprises pressure plates, flexible sealing pads, a mandrel and a nut, the mandrel is a dumbbell type, wherein an intermediate part is a first step, the steps from the second step to the ninth step are symmetrically arranged at the right end and the left end of the mandrel, the steps from the second step to the fifth step are arranged at the left end of the mandrel, the steps from the sixth step to the ninth step are arranged at the right end of the mandrel, the maximum axle diameters are less than or equal to the internal diameter of the to-be-measured pipe fitting, an inward pore is arranged on the first step, the pore extends to a random end part of the mandrel, the pressure plates and the flexible sealing pads are arranged on the third step and the seventh step, the outside threads are arranged on the fourth step and the seventh step, and the nut is cooperated with the corresponding step through the outside thread. The apparatus has the advantages of simple structure, safety and reliability, and convenient operation, and can effectively detect the sealing performance of the short straight metal pressure pipe fitting.