175 results about "Compression testing" patented technology

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.

An unbonded capping system for compression testing of concrete cylinders comprises first and second retaining cups comprising metal blocks each having opposite parallel planar surfaces. A first of the planar surfaces is engageable by a test apparatus, in use. A second of the planar surfaces has a cylindrical cavity of a first select diameter for receiving one end of the concrete cylinder. First and second cylindrical compression pads are each to be received in one of the retaining cup cavities to abut an end of the concrete cylinder, in use. The compression pads are of a second select diameter smaller than the first select diameter of the cavity to define a circumferential space therebetween. Nubs are provided for gripping the cavity to prevent the compression pads from falling out of the cavities.

The invention discloses a bent casing pipe non-uniform collapse strength simulation test method and device. Through a thrust bearing and a right clamp, additional bending moment is applied for a casing pipe fixed by a left clamp and a support, the right clamp produces up-down reciprocating motion under the action of the thrust bearing so that the casing pipe is bent and produces a certain overall angle change rate, through a front movement pressure head and a rear movement pressure head of a compression-testing machine, non-uniform load is applied for the bent casing pipe, the casing pipe strains under different loads are recorded by a strain gage and a strain meter on the outer wall of the casing pipe, based on the test data, a relationship curve of the non-uniform loads and the casing pipe strains is drawn, non-uniform collapse strength of the casing pipe at the overall angle change rate is calculated, and through change of the overall angle change rate, non-uniform collapse strength values of the casing pipe at different overall angle change rates are obtained. The test method and device are suitable for test and research of non-uniform collapse strength of a casing pipe in a crooked hole.

The invention discloses a tension and compression testing machine hydraulic loading system adopting differential control of proportional overflow valves. The system comprises a hydraulic pump station, a low-pressure filter, an oil return one-way valve, the high-pressure proportional overflow valve, a flow dividing valve, the two low-pressure proportional overflow valves, an oil inlet one-way valve, two electromagnetic reversing valves, two tension and compression force sensors, two hydraulic cylinders, two displacement sensors and a force and displacement compound controller. The differential control of the proportional overflow valves and compound control over the pressure and displacement of the hydraulic cylinders by pressure valves are adopted, and the micro force control and loading force control precision of a testing machine is improved; and during static and quasi-static loading of the tension and compression force testing machine, the loading force and the hydraulic cylinder synchronous displacement in the loading process are controlled in real time, and control over any loading curve and synchronous control over the multiple hydraulic cylinders are achieved. By means of the tension and compression testing machine hydraulic loading system adopting differential control of the proportional overflow valves, the tension and compression testing machine can adapt to various complicated loading work conditions. The tension and compression testing machine hydraulic loading system adopting differential control of the proportional overflow valves is suitable for the occasion where the loading force changing range is wide, the adjusting precision is high, and the hydraulic cylinders frequently need to perform synchronous control during static and quasi-static loading.

The invention provides a concrete material in-high-temperature compression testing machine and an in-high-temperature compression testing method. The concrete material in-high-temperature compression testing machine comprises loading equipment for applying pressure on a concrete test-piece, heating equipment for heating the concrete test-piece, and a displacement acquisition device for measuring the deformation of the concrete test-piece. According to the concrete material in-high-temperature compression testing machine, the heating equipment and the loading equipment for concrete testing are skillfully combined together, and are assisted by the displacement acquisition device, so that a comprehensive testing system capable of being used for concrete test-piece in-high-temperature compression testing is formed, synchronization of heating and loading is realized, a concrete environment in high temperature due to fire can be truly simulated, a test result obtained by performing a concrete material test through the concrete material in-high-temperature compression testing machine is very close to actual compressive property of concrete in high temperature due to fire, and a guarantee is provided for researching high temperature performance and fire resistance of a concrete material.

The invention discloses a device for testing compression in a rectangular steel plate surface, belonging to the field of civil engineering professional testing devices. The device is formed by connecting a square main frame with H-shaped steel through a bolt, and can be used for self-balance in a test load. In the device, a load guide rigid block is arranged between a hydraulic jack and a steel plate loading edge, so that uniform compression loading is realized, and off-plate simple support constraint conditions are provided for four sides of a test steel plate through a wedge-shaped support plate. In the entire testing device, the size of a component can be adjusted flexibly according to the size of a test piece, so that the loading requirements of steel plates of different sizes are met. Due to the adoption of the device, uniform compression testing in the rectangular steel plate surface is more convenient, and the batch testing requirements of test pieces are met simultaneously; and the device can be applied to civil engineering teaching and scientific research testing.

A memory device with a data path circuit having support in the sense-amp region for compression testing of the device. The data path circuit uses NOR logic compression to provide a scalable design which may be extended to large circuits.

The invention relates to a preparation method of a heavy metal solid waste curing agent. The method comprises the following steps: 1) composition of the curing agent: the curing agent comprises the following components of: 30% to 45% of dead-burned magnesia powder, 25% to 30% of monopotassium phosphate, 3% to 5% of borax, 8% to 10% coal ash and 19% to 25% of heavy metal solid wastes, wherein heavy metal accounts for 0.5% to 0.7% of the total weight of the curing agent and is mixed with 0.08 % to 0.1% of water; 2) maintenance of a curing body: the curing body is maintained at the temperature of 20+/-3 DEG C and under the relative humidity being more than 90% for 7 or 28 days; 3) compression resisting strength: the maintained curing body put on a compression testing machine to carry out a compression resisting test; and 4) toxic leaching. The method has the advantages that the efficient curing is realized, i.e. the leaching concentration of the heavy metal is low all the time regardless of that whether an EN12457-2 testing method or a TCLP1311 leaching method is adopted; and the reutilization is realized, i.e. the curing body can be used as a building material, so that the heavy metal hazardous wastes are converted into a safe and environmental-friendly building material.

The invention provides a method and a multi-component force-torque sensing device with reduced cross-talk between the sensitive elements. The device contains a mounting base, which supports force sensitive unit and torque sensitive unit. These sensitive units are interconnected by a sensor cross-talk reducing member via respective adapters in such a way that the force is translated to the force sensitive unit without affecting or disturbing the torque sensitive unit, and the torque is translated to the torque sensitive unit without affecting or disturbing the force sensitive unit, thus reducing the cross-talk between the force and the torque measurements.

An agglomerate comprising fine primary particles of an inorganic compound except for silica is provided, satisfying dp₅₀: the average particle diameter [μm] of the agglomerate measured by Microtrac-FRA, a laser analysis type particle size distribution measurement apparatus, a: the value calculated by dividing the difference between the particle diameter d₉₀ of cumulative 90% minus sieve particles of the agglomerate and the particle diameter d₁₀ of cumulative 10% minus sieve particles of the agglomerate calculated by the Microtrac-FRA, Sw: the BET specific surface area [m²/g]of the agglomerate, St: the tensile strength [MPa] required to break the agglomerate with the particle diameter 4 μm, and, Sta: the tensile strength [MPa] required to break 30% of the particle diameter of the agglomerate with the particle diameter 4 μm, both St and Sta being measured by a micro compression testing machine manufactured by Shimadzu Corporation. The agglomerate of the present invention provides a resin composition excellent in the anti-blocking property and the stretching resistance property.

Compression testing apparatus for analyzing porous materials includes a cylindrical channel having a central bore, solid outside, upper and lower walls, the inner edge of the channel being open to the inner bore. A flexible sealing member having a central bore concentric to the bore of the cylindrical channel opposes the edge of the channel. The flexible walls of the flexible member overlap with and are sealingly affixed to the upper and lower surfaces of the channel. The central bore of the flexible sealing member thus forms a sample chamber for porous material to be tested. Top and bottom sealing members cover the sample chamber and a gas inlet enters through the outside wall of the cylindrical channel for applying biaxial or radial compression on the test material. Triaxial compression is applied with addition of a weight or piston sealingly engaged within the central bore of the flexible sealing member.

The invention relates to a quantitative tension and compression testing device which belongs to the technical field of material testing. The device comprises a fixed base, a support stand, a loading support stand, a quantitative tension and compression rod and three fixed pulleys. The device has simple structure, can be used together with other testing instruments, has strong extension applicability, and realizes very high testing precision and larger loading and moment increase by ingeniously arranging the positions of the three fixed pulleys and the length ratio of the tension and compression rods with geometric and leverage principles. The positions of the three fixed pulleys must be relatively on the same circular arc with a round pin hole at the middle part of a quantitative loading rod; and when a weight is quantitatively loaded and applied, the three fixed pulleys are still on the same circle of center so as to fully ensure the loading precision. The length ratio of quantitative loading rods A and B decides the loading torque ratio.

The invention relates to a high-speed dynamic compression testing device. The high-speed dynamic compression testing device comprises a base for mounting a test piece and a loading mechanism for performing compression loading on the test piece; the loading mechanism comprises a pressing plate for compressing the test piece and a connecting rod of which one end portion is fixedly connected with the pressing plate; the base is provided with a cavity for holding the test piece and the pressing plate, and a mounting plate for mounting the test piece; one end portion of the connecting rod is located in the cavity, while the other end portion of the connecting rod penetrates through the mounting plate and extends out of the cavity, and the connecting rod is arranged in such a manner of sliding relatively to the mounting plate; the loading mechanism further comprises a loading plate of which one surface is fixedly connected with the other end portion of the connecting rod, and an unloading rod which is fixedly connected with the other side surface of the loading plate. The high-speed dynamic compression testing device can be directly applied to a high-speed tensile testing machine, is capable of realizing high-speed dynamic compression at low, medium and high different strain rates, and is safe and reliable.

The invention relates to an oil well cement high-temperature high-pressure compressive stress strain system comprising a cement compression testing module, a power source, a pressure controlling unit, a temperature controlling unit, a signal controlling and processing unit, and pipelines. With the invention, temperature and pressure of bottom hole maintenance can be simulated. The compressive stress of oil well cement stones can be continuously measured under the temperature and pressure, and a temperature-pressure curve and a compressive stress-strain curve can be recorded. With the system and the method, anti-compression properties of different cement slurry systems can be directly measured and compared. The system and the method are beneficial for the design of cement slurry formulas. With the system and the method, cement slurry systems satisfying in-field construction requirements can be obtained.

The invention provides an in-situ method for obtaining rock parameters, and relates to the field of rock inspection. The method comprises the steps of rock taking: two target drill cores with different diameter dimensions are drilled by using a small drilling machine; cutting: the drill cores are processed by using a cutting tool, the drill cores are put into a steel sleeve tube, the sleeve tube is fixed by using a rubber sleeve ring, and the drilling cores are processed into testing rock samples with different dimensions by using an angle grinder; inspection: the rock samples obtained outdoors are placed into a testing instrument, and a single-shaft compression testing and a triple-shaft compression testing are conducted on a drilling core testing member. The testing instrument has the advantages of being simple and portable, axial pressurizing and confining pressurizing can be conducted on a testing member, two functions of the engineering in-situ measuring of the single-shaft pressure resistance of the drill core and the triple-shaft pressure resistance of the drill core with a structural face are mainly achieved, and the in-situ testing of rock parameters is more convenient andpractical under the cooperation of APP software.

The invention discloses a cement compression resistance clamp for a compression testing machine and a usage method of the clamp. The cement compression resistance clamp for the compression testing machine includes a shell body, a telescopic rod, a bearing plate, a sliding block, a test piece position calibrating column, a pressure head and a plurality of springs, wherein an opening is formed in one side surface of the shell body; a through hole is formed in the top of the shell body; the upper end of the telescopic rod is fixedly connected with the bearing plate; the lower end of the telescopic rod penetrates through the through hole and is inserted into the shell body; the upper part of the sliding block is connected with the lower end of the telescopic rod; the pressure head is fixed at the bottom of the sliding block; one end of each spring is connected with the inner side surface at the top of the shell body; the other end of each spring is fixed at the upper part of the sliding block; the bearing plate is mounted on the compression testing machine; the test piece position calibrating column and a cement mortar test piece to be tested are fixed on the inner side at the bottom of the shell body; the cement mortar test piece to be tested is in contact with one side of the test piece position calibrating column; the pressure head is positioned right above the cement mortar test piece to be tested. When the compressive strength of the cement mortar test piece is tested, the cement mortar test piece to be tested can be clamped by the cement compression resistance clamp.

The invention discloses a valve state on-line monitoring system and a working method thereof. The invention relates to the field of industry process control and detection, and in particular to improvements of technology of valve state on-line monitoring and fault diagnosis. The valve state on-line monitoring system has exquisite structure, is easy to use and has high reliability, and can use valve position (i.e., valve caliber and opening amount of a valve gate) and valve pressure to calculate a theoretical torque so as to compare the theoretical torque and actual torque and finally provide accurate determination of the state of the valve. An electric apparatus is connected to the valve, and is intended for driving the valve to perform opening and closing movement. A torque sensor is connected between the electric apparatus and the valve, and is intended for acquiring the current torque of the valve. A pressure transmitter is connected to a compression testing machine, and is intended for measuring current working pressure of the valve, and converts the pressure to a current signal. According to the invention, the system as a whole is characterized by exquisite structure, easy usage and high reliability.

A rock sample fixing device with a three-jaw chuck for cyclic tension and compression testing including: a lower clamp and an upper clamp; the lower clamp including a lower connector connected to a loading base at a bottom of a testing machine, a lower end cap for fixing samples, a lower chain connecting the lower connector and the lower end cap, a first central position-limit mechanism, a second central position-limit mechanism, and a first hydraulic mechanism; the upper clamp including an upper connector connected to a loading base at a top of the testing machine, an upper end cap for fixing samples, an upper chain connecting the upper connector and the upper end cap, a third central position-limit mechanism, a fourth central position-limit mechanism, and a second hydraulic mechanism.

The invention discloses a set-off shell material for fireworks and crackers, which is prepared from the following raw materials in portion by weight: 1 to 2.5 portions of starch, 1.5 to 3 portions of vegetable fiber, 4.5 to 8 portions of clay, 0.09 to 1.0 portion of activating agent, and 0.1 to 0.9 portion of stabilizing agent. The shell material takes the clay as a base material and the starch and the vegetable fiber as auxiliary materials and can be biodegraded in the natural environment, which is advantageous for environmental protection, and the prepared shells of the fireworks and the crackers have high strength, are high-temperature resistant, reduce the possibility of undershooting during the of setting off, and reach the standard of 'method for compression and stacking tests by a compression testing machine' of GB/T4857.4-2008. The fireworks and the crackers made from the set-off shell material prepared by the method have high strength, strong set-off performance and high safety performance, and reach the standards of GB10631-2004, GB19593-2004 and GB19594-2004.