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997 results about "Axial pressure" patented technology

Safety syringe needle device with interchangeable and retractable needle platform

The syringe includes a barrel, a plunger, and an adapter for mounting the needle in the distal end of the barrel. The adapter includes a protrusion projecting away from the needle end and into the barrel defining an annular space between the barrel and the protrusion. The plunger and protrusion have complementary surfaces whereby the plunger may grip the adapter for removal of the adapter into the interior of the barrel after use. These complementary surfaces afford initial resistance to further axial movement of the plunger toward the adapter, signalling the user that further axial pressure will permanently lock the plunger and adapter to one another whereby, upon application of full axial pressure on the plunger, the complementary surfaces of the plunger and adapter permanently lock to one another to enable joint unitary movement of the plunger and adapter together with the needle carried by the adapter into the barrel. The adapter includes vent passages communicating between the central passage through the adapter and the annular space whereby air can be vented from the barrel after receiving fluid within the barrel and prior to injection. Thus, the syringe may be oriented in a vertical position needle end uppermost with the vent passages forming the most superior portion of the barrel interior whereby air may be vented.
Owner:INVIRO MEDICAL DEVICES LTD

Method for synchronous measurements on dynamic and static elastic parameters of rocks

The invention provides a method and a device for synchronous measurements on dynamic and static elastic parameters of rocks by using a rock triaxial anti-compression testing device. The method comprises: sealing a test rock sample in a triaxial autoclave filled with hydraulic oil, applying an oil pressure by an axial pressure control system, applying a confining pressure by a confining pressure control system, and applying a pore pressure by a pore pressure control system; acquiring propagation speeds of longitudinal waves and transverse waves in the test rock sample by a computer acquisition and control system, and calculating the dynamic Young modulus and the dynamic Poisson ratio according to the propagation speeds; and acquiring deformation parameters of the test rock sample during a loading process by the computer acquisition and control system, and calculating the static Young modulus and the static Poisson ratio according to the deformation parameters. The method and the device can ensure validity and accuracy of hydrocarbon reservoir rock mechanical parameter measurements in thousands of meters deep underground and under the conditions of complex confining pressure, high temperature, high pore pressure and polyphase fluid.
Owner:PEKING UNIV

Penetration and corrosion triaxial testing apparatus for gravel soil and testing method thereof

The invention provides a penetration and corrosion triaxial testing apparatus for gravel soil. The penetration and corrosion triaxial testing apparatus comprises a pressure control system, a penetration and corrosion triaxial testing system and a sand-water separation system, wherein the penetration and corrosion triaxial testing system is used for containing gravel soil samples and can form a penetration and corrosion environment with a multistage water head and complex stress condition through self-loaded axial pressure as well as confining pressure and water pressure, provided by a pressure supplying system; the contained gravel soil samples can flow out of the penetration and corrosion triaxial testing system in the penetration and corrosion environment and then enter the sand-water separation system. The invention also provides a testing method of the triaxial testing apparatus. According to the triaxial testing apparatus, the samples are placed in a pressure chamber with confining pressure to be saturated, so that the multistage water head can realize penetration, corrosion and strength testing under a condition that the real environment stress state is simulated; corroded particles are discharged through a porous chassis of the pressure chamber, the mass of the corroded particle can be weighed in real time after sand-soil separation, and the penetration and corrosion triaxial testing process with the multistage water head and the complex stress condition can be effectively carried out.
Owner:SHANGHAI JIAO TONG UNIV

Device and method for gas bearing shale-seepage-temperature coupling and displacement experiment

The invention belongs to the field of rock engineering, and in particular relates to a device and a method for a gas bearing shale-seepage-temperature coupling and displacement experiment. The experimental device comprises a triaxial pressure cavity, an axial pressure loading system, a confining pressure loading system, an upstream gas pressure loading system, an upstream liquid pressure loading system, a downstream gas pressure loading and collecting system, a downstream liquid collecting system, a multi-component mixed gas collecting system, a vacuumizing device, a heating system and a data collection control system. The experimental method comprises the following steps of: fixing a test piece; applying confining pressure; applying axial pressure; heating; vacuumizing; applying upstream liquid pressure (or pre-saturated methane); applying upstream gas pressure (or applying upstream gas pressure); injecting multi-phase mixed fluid (or applying another upstream liquid pressure); performing pre-adsorptive saturation by the test piece (injecting multi-component constant-proportion mixed gas); and collecting. The experimental device can be used for applying triaxial stress to the test piece according to the actual stress condition, and remolding a stress environment according to the fact.
Owner:NORTHEASTERN UNIV

Rotating shaft structure with automatic locking mechanism

The present invention discloses a rotating shaft structure with automatic locking mechanism, characterized in which a shaft extending axially from an axial member passes through, in sequence, the core hole of the upright frame plane of the main frame, a friction disc, a disc-like connecting part connected with the frame plane, a cam member comprising a fastening part and a sliding part, at least an elastic body, and a connecting segment on the free end of the shaft connected with a end enclosure so as to form axial pressure to constrain the elements described above. The shaft and the main frame are provided with a linking portion and a connecting portion, respectively. The outer and inner edges of the adjoining planes between the fastening part and the sliding part are provided with at least a wedge block and at least a wedge slot alternately so as to connect the fastening part and the sliding part together. Consequently, when the axial member rotates, the inclined plane of the wedge slot of the sliding part moves upward along the inclined plane of the wedge block and thus axially presses the elastic body so as to prompt the contact plane of the sliding part to rotate along the wedge blocks of the fastening part. When the axial member rotates reversely, the wedge slots of the sliding part move to the wedge blocks of the fastening part and, under the extending action of the elastic body, the wedge slots are engaged into the wedge blocks so as to form an automatic locking of butting joint.
Owner:HO CHI JUNG +2

Self-adjusting lens mount for automated assembly of vehicle sensors

A two piece lens mount system for mounting a lens in correct focus and alignment relative to a CMOS imaging device such that the optical axis of the lens is coincident with and perpendicular to the center of the active area of the imager array. The lens is secured by the axial pressure of flexible ribs that are symmetrically spaced around the internal bore of a lens holder and act on a smooth surface on the outside of the lens. This arrangement eliminates translation of the lens across the imager array. Another portion of the body of the lens is threaded such that the lens, when rotated about its optical axis may be focused or axially aligned. When a focus or axial alignment point is reached, a staking fluid may be added to the lens thread, through a hole in the lens holder to prevent de-focusing. The second component of the lens mount system, the lens mount base, is fixedly secured to an imager board on which is mounted a CMOS imager. The upper wall of the lens mount base is in close, parallel proximity to the optical flat of the imager and has a rectangular opening which restricts light from the lens to the active area of the imager, and more specifically prevents light from falling on the column amplifiers of the imaging device. The design of both components is such that they may be moved relative to each other with external fixturing, in front of a known target, until it is decided that the lens is directly over the center of the imager array. The lens holder and the lens mount base are then fixed together permanently using a laser weld process or any other plastic bonding technique.
Owner:ITERIS INC +1

Device for testing durability of water pressure resistant grouted rock

The invention discloses a device for testing the durability of a water pressure resistant grouted rock, which comprises a pressure chamber, a control cabinet, heating equipment, pressurizing equipment, measuring equipment and accessory equipment, wherein the heating equipment can supply a stable heat source for the pressure chamber; the pressurizing equipment can provide confining pressure and osmotic pressure for the pressure chamber; the pressure chamber can apply an axial pressure by means of a universal test, is corrosion resistant and can realize annular and vertical penetration tests of three kinds of standard samples of different dimensions at different temperatures and pressures; the measuring equipment can realize accurate measurement of temperature, pressure and flow rate; and the control cabinet can realize the accurate control of pressure and temperature. The device can be used for indoor researches on the durability of tunnel water pressure resistant grouted rock or dam impervious curtain in an environment of high-water-pressure and corrosive environment, and at the same time, realizes the researches on the change rule of the permeability of a rock sample under the coupled actions of a temperature field, a seepage field, a stress field and a chemical field.
Owner:TONGJI UNIV

Microcomputer-controlled electro-hydraulic servo rock tri-axial dynamic shear-seepage coupling multifunctional test method

A microcomputer-controlled electro-hydraulic servo rock tri-axial dynamic shear-seepage coupling multifunctional test method belongs to the technical fields of rock mechanics and engineering technology and is characterized in that a test apparatus is composed of a loading system, a sealing system, a multiphase fluid injection system, an acoustic emission monitoring system, a deformation monitoringsystem and a data collection system. The test method not only solves technical problems that a tri-axial pressure chamber cannot be used for performing large displacement shear-seepage coupling of rocks under high confining pressure and high seepage pressure, and also can achieve various extended functions on the basis of the technology. The apparatus can achieve servo control loading of force, displacement and strain rate in shear direction and injection seepage of a multiphase fluid during dynamic shear. In addition, the apparatus is equipped with a temperature control system for performingconstant temperature control to the tri-axial pressure chamber at 0-200 DEG C; therefore, a series of extended experiments of dynamic shear-seepage coupling features of rocks under effect of temperature can be carried out.
Owner:TAIYUAN UNIV OF TECH

Component pressing and twisting experimental device and method thereof

The invention relates to a device and a method for component compression-torsion testing, belonging to the technical field of architecture structure test. The device comprises a pedestal, a reaction beam, a reaction wall, a vertical force jack, a front clamp plate, a back clamp plate, a pure torsion loading beam, a loading beam and a horizontal force jack, wherein a component is fixed on the pedestal; the vertical force jack is connected at the lower surface of the reaction beam and corresponds to the component in position; the top of the component is tightly clamped between the front clamp plate and the back clamp plate; the loading beam is fixedly connected with the front clamp plate and the back clamp plate; one end of the pure torsion loading beam is articulated with the front clamp plate and the other end is fixedly connected with the reaction wall; one end of the horizontal force jack is articulated with the loading beam by a force sensor and the other end is fixedly connected with the reaction wall. In a test, the vertical force jack applies axial pressure to the component and the horizontal force jack applies horizontal force to the component to form the torque to the component. The device for component compression-torsion testing has simple structure and convenient assembly, can be used instantly after the assembly and can be used repeatedly.
Owner:BEIJING UNIV OF TECH

Pressing-twisting multi-shaft loading testing machine

The invention discloses a pressing-twisting multi-shaft loading testing machine. The pressing-twisting multi-shaft loading testing machine comprises a machine frame, a sample pressure chamber, an axial pressure controller, a confining pressure controller and an oil source system, wherein the sample pressure chamber is arranged on the machine frame and is used for accommodating samples therein; the axial pressure controller is used for applying axial loads to the samples in the sample pressure chamber; the confining pressure controller is used for applying confining pressure loads to the samples in the sample pressure chamber; the oil source control system is used for controlling the axial pressure controller and the confining pressure controller respectively to apply different paths of loads; and the axial pressure controller and the confining pressure controller are configured in a mode that the axial force is coupled with the confining force when the loading of the samples in the sample pressure chamber is buffered. The pressing-twisting multi-shaft loading testing machine can integrate complicated loading such as pressing-twisting combination, plane strain, true triaxiality and the like and is suitable for the tests of static power units of the common coarse-grained soil and ideal soil simulation materials during engineering construction.
Owner:TSINGHUA UNIV

Device and method for testing looseness of rock under disturbance of strain rate in loading process of pendulum bob

ActiveCN104181029AImplement relaxation testStress waves are easy to controlStrength propertiesStrain rateAxial pressure
The invention discloses a device and a method for testing looseness of rock under disturbance of a strain rate in the loading process of a pendulum bob. The device is suitable for testing the loosing performance of a rock test piece under the compression effect of axial static load (and confining pressure), a transmission bar on an axial pressure loading plate is driven by utilizing a worm and gear and adjusting a hand-operated rocking handle, and the loose test of the transmission bar on the test piece under the grading displacement loading and constant displacement condition can be realized; a stable axial static load (and confining pressure) can be applied by the device to the rock sample, and then the load is impacted by adjusting the pendulum bob so as to apply the axial power, so that the rock sample is broken, and the mechanical property of the rock after suffering the impact load at a long-term loosing state can be tested. By adopting the device and method, the mechanical response characteristics and damage mechanism of the rock under the long-term loosing effect and instantaneous dynamic disturbance effect can be studied, and an important theoretical significance on evaluating the stability of an underground digging space and designing a permanent support of an underground rock project can be realized.
Owner:NORTHEASTERN UNIV

Device for Simultaneous Measurement of Gas Injection Coal Expansion and Permeability under Triaxial Stress Conditions

The invention discloses a device for simultaneously measuring expansion and permeability rate of gas injected into a coal rock under a tri-axial stress condition. The device comprises a gas injection system (1), a confining pressure system (2), an axial pressure loading machine (25), a permeability measuring system (3) and a data acquisition system (4), wherein the gas outlet port of the gas injection system (1) is connected with the gas inlet port of the confining pressure system (2) through a high pressure gas inlet pipe (43); the axial pressure loading machine (25) is arranged at the external part of the confining pressure system (2); the permeability measuring system (3) is connected with the gas outlet port of the confining pressure system (2) through a high pressure gas pipe; and the data acquisition system (4) is connected with the confining pressure system (2) through a data line with a sensor. According to the device provided by the invention, the problem of measuring coal-body deformations and permeability variations of different adsorption gases at different temperatures and different pressures is effectively solved; in addition, the permeability and coal-body change laws caused by a gas injection displacement in the process of developing coal bed gases are effectively simulated so that the production practice is beneficial to be further guided.
Owner:CHINA UNIV OF MINING & TECH (BEIJING)

Spherical contact type friction characteristic testing device under ultrasonic vibration

The invention discloses a spherical contact type friction characteristic testing device under ultrasonic vibration. The device consists of a main movement unit, a loading unit and a dynamometer unit, wherein the torque output by a step motor is converted into axial pressure of a sliding table through a lead screw nut pair of a trapezoidal screw, and an upper sample and a lower sample which are arranged at the bottom of a piezoelectric micromachined ultrasonic transducer are contacted with each other, and certain pressure is applied to the lower sample; when the piezoelectric micromachined ultrasonic transducer is connected with an ultrasonic power supply, the upper sample produces ultrasonic frequency vibration with micron-grade amplitude in the horizontal direction or the vertical direction, the lower sample rotates together with a rotating platform and forms a friction pair with the upper sample, so that the friction characteristic of the spherical contact under ultrasonic vibration can be tested. The device can be used for accurately controlling the testing parameters, is high in degree of automation, and can be used for performing spherical contact friction experiments of various types of friction materials under different ultrasonic vibration frequencies and vibration amplitudes.
Owner:JILIN UNIV

Multi-field coupling penetration test device and method for cracked rock

ActiveCN104819926AGuaranteed real temperaturePermeability/surface area analysisChemical solutionAxial pressure
The invention discloses a multi-field coupling penetration test device and a multi-field coupling penetration test method for cracked rock. The device comprises a computer servo control system, a confining pressure chamber, a hydraulic system, a temperature control system and a chemical solution system, wherein the hydraulic system and the confining pressure chamber are connected by virtue of a confining pressure device, an axial pressure device and a seepage device respectively; the temperature control system is arranged outside the confining pressure chamber; and the chemical solution system is connected with the seepage device. The test method comprises the following steps: opening the hydraulic system, and loading an oil source; putting a sample into a pressure chamber; loading axial pressure and confining pressure; loading the seepage pressure; loading a chemical field; applying temperature; and measuring the data. The four-field loading systems are independent from one another, the evolution test research of permeability characteristics and mechanical properties of the cracked rock can be really simulated under high water pressure, large hydraulic gradient, temperature change and water chemistry complicated conditions, and the whole-process experimental research of rock deformation damage and penetration, stress, chemistry and temperature coupling can be performed.
Owner:HOHAI UNIV

Determination method for mesoscopic parameters simulating mechanical properties of intermittent crack rock

Belonging to a rock mechanical determination method, the invention provides a determination method for mesoscopic parameters simulating mechanical properties of an intermittent crack rock. The method includes: firstly sampling an engineering rock mass to be tested, and making a complete and intermittent crack cuboid sample; placing the made sample in a sealed pressure cylinder of a servo test machine, firstly bringing a testing machine pressure head into close contact with the upper end and lower end of the rock sample; applying an axial pressure on the sample according to displacement loading, and conducting loading on the sample till fracture, thus obtaining a sample compression process stress-strain overall process curve, a crack propagation process and a final fracture mode; employing particle flow code in 2 dimensions (PFC2D) to establish a complete sample numerical model, and debugging the mesoscopic parameters continuously to acquire a set of mesoscopic parameters able to reflect complete rock sample test results; establishing an intermittent crack numerical model based on the mesoscopic parameters, carrying out compression process simulation, comparing the simulation results with the intermittent crack rock test results so as to further verify the accuracy of the mesoscopic parameters.
Owner:CHINA UNIV OF MINING & TECH

Toroidal fissured rock sample, MHC coupled seepage experimental device of sample and use method of device

The invention discloses an MHC (mechanical-hydrological-chemical) coupled seepage experimental device for testing a toroidal fissured rock sample. The device is provided with a pressure stabilizing mechanism located above the experimental device and used for providing experimental pressure, a loading head located below the pressure stabilizing mechanism and used for transferring the pressure, a confining pressure chamber located below the loading head and providing liquid confining pressure and an axial pressure experimental environment for the sample, and a force transmission column located below the confining pressure chamber, wherein the confining pressure chamber is provided with a vertical annular confining pressure chamber side wall; an upper sealing cover and a lower sealing cover are arranged above and below the confining pressure chamber side wall respectively and provided with through holes respectively; the two through holes are coaxial; at least one solution flowing hole is formed in the confining pressure chamber side wall; and the force transmission column is internally provided with a pipeline I. Each sample is arranged in a corrosive solution with certain pressure, the pressure of the solution provides the confining pressure and an inflow water head, and a loading device and a gas storage tank pressure stabilizing device provide long-duration loads for a creeping test at the two ends of the sample.
Owner:DALIAN MARITIME UNIVERSITY

Permeability measuring device and method of hydrate-contained sediments under three-axis stress conditions

PendingCN107894383AAccurately measure the volume change of the measured sampleAccurate measurement of body changesPermeability/surface area analysisMeasurement deviceAxial pressure
The invention discloses a device and method for measuring the permeability of hydrate-containing sediments under triaxial stress conditions. The measuring device includes a reaction kettle, a pressure control system, a hydrate saturation measurement system and a permeability measurement system. The system can simultaneously apply axial pressure and confining pressure to achieve precise control of axial pressure and confining pressure; the hydrate saturation measurement system uses a flexible time-domain reflection probe to minimize the impact on seepage channels; the permeability measurement system real-time Detect the change of hole pressure, outlet pressure and liquid output, and realize the automatic calculation of sample permeability, which is efficient and accurate, and avoids manual errors. Using this permeability measurement device and its corresponding test method, the permeability simulation experiment of hydrate-containing sediments under triaxial stress conditions can be carried out, and the simulated data of hydrate-containing sediment permeability and saturation under triaxial stress conditions can be obtained. It provides an effective theoretical basis for the law of water production and gas production in the process of depressurization of hydrates.
Owner:QINGDAO INST OF MARINE GEOLOGY

Device and method for heating rock specimen under triaxial pressure

The invention relates to a device and a method for heating a rock specimen under a triaxial pressure. The device consists of a triaxial pressure chamber furnace body, an axial pressure head, a confining pressure head, an upper pressure head, a lower pressure head, pressure-transmitting, heat-generating, insulating and heat insulation materials, a thermocouple, a traction trolley base, a triaxial pressure machine and a temperature control cabinet, wherein the triaxial pressure chamber furnace body is arranged on the traction trolley base; solid-particle pressure-transmitting materials, the thermocouple and heat-generating, insulating and heat insulation materials are arranged in a space encircled by the axial pressure head, the confining pressure head, the upper and lower pressure heads, the rock specimen and the inner wall of the triaxial pressure chamber furnace body; and water cooling copper pipes are distributed at the periphery of the triaxial pressure chamber furnace body. The triaxial pressure machine is used for pressurizing the axial pressure head and a confining pressure sleeve, adjusting the output current of the temperature control cabinet and changing the heat productivity of an electric heating alloy sheet; the heat passes through a piece of mica paper and is transmitted to the rock specimen; the thermocouple measures the ambient temperature of the electric heating alloy sheet in real time; and the temperature control cabinet displays and records the ambient temperature, compares the displayed temperature with the experimental fitted temperature, and adjusts the current to realize the controllable temperature of the rock specimen.
Owner:CHINA UNIV OF MINING & TECH

Surgical bone milling instrument

A surgical bone milling instrument, suited to operate in a hole formed in a bone, comprising a milling element (10), with longitudinal axis (A) and with the forward end portion (11) rotating around a longitudinal axis (A), and milling the bone. The instrument comprises a tubular element (30) of circular external cross-section and provided with a thread engaging, by helical coupling, a hole formed in the bone. The milling element (10) is associated with the tubular element (30), arranged so that the forward end portion (11) thereof is located ahead of the tubular element (30) and can rotate around the longitudinal axis (A) thereof and translate axially relative to the tubular element (30). The milling element (10) has a rear portion (14) which passes coaxially through the tubular element (30), while the forward end portion (11) projects beyond the front of the tubular element (30). The milling procedure of a bone cavity can be completed while maintaining control of the position of the device relative to the hole. Furthermore, in each phase in which the milling element is rotated, while the instrument is axially stationary inside the hole, a groove is created on the end of the hole (or an extension of the entire hole) the depth of which is constant and predetermined. Further, by way of axial pressure applied to the milling head by the drive element, a detachment of residual bone wall can be achieved as soon as this has reached a breaking resistance which is lower than a force applied by the drive element.
Owner:C G M CO LTD

Testing device for simulating mechanical behaviors of gravel soil subgrade under reciprocating traffic moving load

The invention relates to a testing device for simulating mechanical behaviors of a gravel soil subgrade under reciprocating traffic moving load. The device comprises a peripheral framework, a test sample box, an axial loading unit, a horizontal loading system and a data acquisition system, wherein the test sample box is arranged in the peripheral framework, a gravel soil subgrade test sample is filled in the test sample box, a road slab is paved above the gravel soil subgrade test sample, the axial loading unit comprises a trundle and a hydraulic loading system, the trundle is arranged on the road slab, the hydraulic loading system applies an axial pressure to the trundle, the horizontal loading system maintains the horizontal reciprocating movement of the trundle, and the data acquisition system is arranged at the four corners of the side wall of the test sample box. Compared with the prior art, the device disclosed by the invention can simulate the mechanical behaviors of the gravel soil subgrade under the reciprocating traffic moving load to obtain the relationship between gravel soil subgrade deformation settlement and parameters of loading time, loading frequency, axial load and the like, thereby reasonably guiding the engineering practice of road engineering construction and ensuring the stability of the gravel soil subgrade.
Owner:TONGJI UNIV
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