145 results about "Viscoelasticity" patented technology

The invention relates to the technical field of computers, and discloses a rock creep model construction method and device and a rock failure mode determination method. The method comprises the steps of obtaining a data set; samples in the data set comprise input data and output data, the input data comprise creep load holding time, sample rock stress data, initial macroscopic damage data, initial microscopic damage data, long-term strength and a creep starting threshold value, and the output data is a strain true value; fitting the initial rock creep model by using the data set to obtain a final rock creep model; wherein the initial rock creep model comprises at least one of a damaged elastomer strain item, a damaged viscoelastomer strain item and a damaged viscoplastic body strain item; each strain item comprises a macro-micro nonlinear coupling damage item, and the macro-micro nonlinear coupling damage item is generated based on the initial micro damage data and the initial macro damage data. The model constructed by the method can truly reflect the nonlinear mechanical response of the rock mass under the combined action of the multi-scale initial defects.

The invention provides a touch force feedback simulation method and system based on a pressure deformation signal, and relates to the technical field of touch interaction and tactile feedback, and the method comprises a data collection process: configuring a sensor to collect the physical state of a touch interface, and obtaining an instantaneous pressure and deformation signal; the impedance compensation process comprises the following steps: step 1, acquiring an instantaneous signal; 2, constructing a dynamic hysteresis loop model; step 3, calculating a viscosity energy loss value; 4, generating an energy compensation waveform; 5, an actuator is driven to generate reverse damping vibration; according to the method, the material viscosity loss is quantified through the physical phase space model, reverse energy is accurately injected, and the problems of touch hysteresis and soft collapse caused by viscoelasticity of a touch interface are effectively solved.

The invention relates to the field of building materials, and discloses high-toughness and high-energy-absorption polymer emulsion modified mortar and a preparation method thereof, and the mortar is composed of ordinary Portland cement, river sand, a polymer emulsion, water, an active admixture and chopped fibers. Wherein the polymer emulsion is selected from styrene-acrylic emulsion (SBR), ethylene-vinyl acetate (EVA), polyurethane emulsion or a combination thereof; the mixing amount is 5-20wt% of the mass of the cementing material. According to the invention, a viscoelastic network is formed in a cement matrix through the polymer emulsion, and the synergistic effect of the active admixture and the chopped fibers is combined, so that the bonding strength, the crack resistance, the impact resistance and the stress wave dissipation capability of the mortar are remarkably improved. Test results show that the mortar provided by the invention is obviously superior to ordinary mortar in the aspects of 28d breaking strength, impact toughness and stress wave attenuation performance, and is suitable for high-performance constructional engineering and protective engineering.

The utility model relates to an enlarged type metal composite viscoelastic damper. The bottom of a metal damper is fixedly connected with an enlarged type viscoelastic damper. The metal damper comprises a T-shaped core plate, L-shaped restraining plates are fixedly connected to the two opposite sides of the T-shaped core plate in the vertical direction, friction areas are arranged between the tops, located on the vertical plane, of the L-shaped restraining plates and the T-shaped core plate, fixing areas are arranged between the bottoms of the L-shaped restraining plates and the T-shaped core plate, and energy dissipation webs are arranged on the portions, between the fixing areas and the friction areas, of the T-shaped core plate. The amplified viscoelastic damper comprises an upper connecting plate, an amplifying lever is hinged to the lower portion of the upper connecting plate, an inner steel plate is hinged to the lower portion of the amplifying lever, the inner steel plate is connected with an outer steel plate through a viscoelastic layer, and the outer steel plate is hinged to the amplifying lever through a fulcrum shaft. The defects of a metal damper can be overcome under small earthquakes, good energy consumption is achieved, the amplifying damper can be protected against excessive displacement and failure under large earthquakes, the damper consumes energy in a multi-stage mode, and the anti-seismic performance of the structure is improved. The components are connected through bolts, are highly assembled and are convenient to replace.

The invention relates to the technical field of general control or regulation systems, and discloses a stirring torque self-adaptive cooperative control method for rheological characteristics of high-solid-content slurry, and the method comprises the steps: obtaining a feedback rotating speed signal and a torque current signal, and resolving the real-time angular momentum of a stirring system; extracting a phase deviation angle of the torque current signal relative to the feedback rotating speed signal to calculate a viscoelasticity characterization value, and correcting a virtual damping parameter of a speed control ring according to the viscoelasticity characterization value; a control error phase track is constructed in a phase plane of the controller, and the local curvature of the control error phase track is monitored, so that the rheological property sudden change state of the high-solid-content slurry is judged; according to the method, control instability caused by non-Newtonian fluid viscoelasticity lag is eliminated through phase domain closed-loop adjustment and phase trajectory singular point pre-judgment, and the operation stability of a driving motor under the extremely high damping working condition is guaranteed.

This invention belongs to the field of data processing technology, specifically relating to a method and system for generating maintenance strategies for bridge collision avoidance facilities based on knowledge graphs. The method includes: constructing a physical topology map of the collision avoidance facilities, obtaining the stiffness weights of connecting edges and initializing node parameters; collecting strain and stress data sequences of the collision avoidance units, and calculating the rheological damage index of the collision avoidance units using a dynamic time warping algorithm; constructing a force transmission probability matrix, and obtaining the comprehensive structural risk value of the collision avoidance units through iterative calculation; and calculating the maintenance urgency index by combining the position weight coefficients and service duration of the collision avoidance units to generate a dynamic maintenance strategy. This invention, by constructing a physical topology map reflecting the physical connection relationships between collision avoidance units, and combining the calculation of hysteresis energy consumption and stress transmission deduction of viscoelastic materials, can accurately identify latent transmitted damage and assess the degree of material rheological aging, thus achieving intelligent maintenance of bridge collision avoidance facilities.

The invention belongs to the technical field of restrained braces, and particularly relates to a viscoelastic double-step all-steel buckling restrained brace which comprises an outer sleeve, two viscoelastic devices, a core plate and a limiting structure, the outer sleeve, the two viscoelastic devices and the core plate are arranged, and the two viscoelastic devices are embedded in the inner side and the outer side of the two ends of the outer sleeve respectively; the viscoelastic material can absorb and dissipate energy generated by earthquakes or wind loads through shear deformation, the vibration response of a structure body is effectively reduced, the anti-seismic performance of a building is improved, the core plate movably penetrates through the viscoelastic device and is arranged in the outer sleeve, the core plate is preliminarily restrained through the outer sleeve, and the anti-seismic performance of the building is improved. According to the limiting structure, the side plates and the multiple limiting plates are matched to limit the core plate, lateral displacement of the core plate can be limited, bending instability of the core plate in the stress process is prevented, it is ensured that the core plate is mainly subjected to axial deformation all the time, and the anti-seismic property of the viscoelastic device is fully exerted.

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

The invention relates to a viscoelasticity measuring device, a viscoelasticity measuring method, and a computer-readable recording medium. The viscoelasticity measurement method may include: collecting viscoelasticity characteristic data including a loss modulus and a storage modulus measured by applying shear strain to an active material slurry for a secondary battery at preset intervals; calculating a loss factor defined as a ratio between the storage modulus and the loss modulus, and calculating a difference between a current loss factor and a previous loss factor as a loss factor differential; generating time series data based on the loss factor differential; performing a sliding window analysis on the time series data to calculate an average value of a plurality of loss factor differentiations included in each window; and deriving, as a damping factor, any one average value among the results of calculating the average values of the plurality of loss factor differentiations included in each window.

The application belongs to the technical field of adhesives, and particularly relates to a rubber type removable pressure sensitive adhesive and a preparation method thereof. The application provides a rubber type removable pressure sensitive adhesive, and preparation raw materials include, by weight, 100 parts of styrene-isoprene-styrene block copolymer, 100-150 parts of tackifying resin, 30-70 parts of softening agent, 0.2-1.5 parts of main antioxidant and 0.2-1.5 parts of auxiliary antioxidant. The unique formula design of the application enables the adhesive to have excellent instantaneous adhesion and sufficient cohesion. The pressure sensitive adhesive of the application benefits from balanced viscoelasticity, and the adhesive can be separated in a clean interface during peeling, without any residue on the surface of the adherend (such as glass, ceramic tile and wooden paint surface) and without damaging the base material. By using hydrogenated resin and a composite antioxidant system, oxidative degradation is fundamentally inhibited, the product is not prone to yellowing, brittle and oiling during long-term use, and has a long service life.

The invention discloses a sand-containing fog seal material and a preparation method thereof. The sand-containing fog seal material provided by the invention comprises the following components in parts by weight: 30-200 parts of matrix asphalt; 60 to 450 parts of water; 0.5 to 10 parts of an emulsifier; 5 to 50 parts of a thickening agent; 1 to 20 parts of a toughening agent; 0.2 to 10 parts of a modifier; and 20 to 60 parts of sand. According to the characteristics and use performance requirements of the sand-containing fog sealing layer material, good storage stability, construction workability, sand compatibility, wear resistance and water sealing performance are guaranteed, and meanwhile, the sand-containing fog sealing layer material has the effects of reducing ductility, viscoelasticity and the like of aged old asphalt and enhancing interface fusion of the old asphalt and the new asphalt; and the material cost can be greatly reduced.

The application discloses an impact-resistant high-thermal-conductivity polyphenylene sulfide composite material and a preparation method thereof, and relates to the technical field of plastic processing. The preparation method comprises the following steps: S1, preparation of a highly oriented PPS fiber insert; and S2, preparation of the impact-resistant high-thermal-conductivity PPS composite material. The application provides an impact-resistant high-thermal-conductivity PPS composite material and a preparation method thereof. Firstly, the viscoelasticity of PPS resin is improved by using high-melt-viscosity and high-temperature-resistant aromatic polyamide, the interfacial compatibility of PPS / aromatic polyamide is enhanced by using a functionalized polysulfone-based resin as a compatibilizer, so that the stretchability and the tensile orientation degree of PPS are improved; PPS composite fibers are obtained by using a melt spinning machine, and a fiber solid-phase high-multiple-stretching-annealing forming process is established, so that the high-toughness and highly oriented PPS composite fiber material is obtained.

The present application relates to the field of ground settlement prediction, and provides a time effect analysis method for ground settlement induced by foundation pit excavation in soft clay area, comprising: determining the time required for foundation pit construction under all working conditions and the retaining wall side displacement curve; determining the soil parameters according to the Boltzmann viscoelastic foundation model; obtaining the viscous settlement of all working conditions by using the Boltzmann viscoelastic foundation model; setting t=0 and the boundary condition as the retaining wall side displacement curve of all working conditions to obtain the elastic settlement under different working conditions; setting the boundary condition as the retaining wall side displacement curve when the bottom plate strength is formed to obtain the viscous settlement of the soil outside the pit after the bottom plate strength is formed; and summing the elastic and viscous settlement to obtain the ground settlement of the to-be-solved arbitrary working condition. The present application overcomes the problem that the existing theoretical method cannot consider the time effect of the soil, thereby leading to the problem that the prediction of the ground settlement is not safe, and also considers the ground settlement after the bottom plate strength is formed without depending on the retaining wall side displacement, which is more engineering significant and has good popularization and application value.

The utility model discloses an anti -collision's environmental sampler, including environmental sampler body, the left and right sides of environmental sampler body all are provided with swing rod suspension mechanism, and the outside of swing rod suspension mechanism is provided with the energy absorption mechanism of pluggable, and first bearing sleeve is fixed in the outer wall of environmental sampler body, and first bearing body is embedded in the middle part of first bearing sleeve, and the lower end of swing rod body is fixedly connected with first bearing body, and first mounting bracket is fixedly connected with the outside of second bearing body, and second bearing sleeve is fixed in the lower end of second mounting bracket, and third bearing sleeve is fixed in the inner wall of PC protection cover, and third bearing body is embedded in the middle part of third bearing sleeve, and rubber pad is fixed in the distal end of socket, and the upper end of PC protection cover is equipped with the apron, and the anti -collision's environmental sampler works in cooperation through swing rod suspension mechanism and the energy absorption mechanism of pluggable, through multistage mechanical vibration isolation and viscoelasticity dissipation double energy absorption mode, the anti -collision performance and field operation reliability of environmental sampler are improved obviously.

The application discloses a method for analyzing nonlinear dynamics and stress wave propagation characteristics of a dielectric elastomer actuator structure. The method considers the strain hardening effect and viscoelasticity of the dielectric elastomer material, establishes a dynamic model of the dielectric elastomer actuator structure from linear damping assumption and considering material viscoelasticity respectively, calculates the equilibrium deformation and inherent frequency of micro-vibration near the equilibrium state, studies the nonlinear dynamic response of the structure under alternating voltage load, explores the influence law of the constitutive parameters on the nonlinear dynamic response, and analyzes the internal relationship between material viscoelasticity and structure vibration damping. In addition, considering compressibility, the stress wave propagation characteristics in the finite deformation state are studied, the separation phenomenon of transverse wave and longitudinal wave is analyzed, and the influence of the constitutive parameters and strain hardening effect on the stress wave propagation characteristics is explored. The application can provide a theoretical basis for the fine design of the dielectric elastomer actuator and the control of stress wave propagation by adjusting the electric field.

To provide an electrophotographic photoreceptor having excellent wear resistance and a surface layer that suppresses image blurring. [Solution] An electrophotographic photoreceptor having a surface layer containing a polymer of a polymerizable charge-transporting compound, wherein in kinematic viscoelasticity measurements, the relationship between the storage modulus G' and the loss modulus G'' of the surface layer is G'>G'' at room temperature, and the Tanδ peak top is in the temperature range of 85°C to 100°C.

The application discloses a high-airtightness inflatable body and a breathing protection suit and a filling-storage-gas releasing protection method thereof, and relates to the field of protection suits. The protective suit is made of high-viscoelasticity, high-airtightness, inflatable and light protective fabric, the inner side of the protective face screen is attached with a layer of anti-fog coating, the protective half-face mask is made of light plastic shell, the inside of the protective half-face mask is made of thermoplastic elastomer material, which can better fit the parts of the face, and the half-face mask air suction valve and the quick-release assembly are arranged on one side of the protective half-face mask and in the inside of the mounting box, so that the poor air permeability of the protective suit is solved, the humidity and heat generated by the human body during the operation process can be accumulated in the protective suit and cannot be eliminated, the operation personnel are affected, and the problems that the back-mounted oxygen cylinder and the heavy protective suit bring certain troubles to the operation process are solved.

The invention discloses a ceramic nanofiber, a preparation method thereof and prepared ceramic aerogel, and the method for preparing the ceramic nanofiber comprises the following steps: 1) mixing and uniformly dispersing an inorganic precursor, a chelating agent, a solvent and a stabilizer to obtain mixed sol; 2) generating linear inorganic polymer sol with activity by controlling hydrolysis and condensation polymerization of an inorganic precursor in the mixed sol; (3) carrying out equilibrium concentration on the linear inorganic polymer sol so as to regulate the viscosity and viscoelasticity of the sol to be in a proper range; and 4) carrying out electrostatic spinning on the sol regulated in the step 3) to obtain precursor fibers, and calcining the precursor fibers to obtain the ceramic nanofibers.According to the method disclosed by the invention, the high-strength doubled ceramic nanofibers can be rapidly prepared, and the doubled ceramic nanofibers can be simply and conveniently assembled into a high-elasticity ceramic aerogel material.

The invention relates to the technical field of electric energy measurement, in particular to a food stirrer energy consumption intelligent monitoring system which comprises an electric signal synchronization module, a ripple layering judgment module, a starting load judgment module, a stage energy consumption analysis module and a viscoelastic characteristic evaluation module. According to the method, a slope abrupt change point index is positioned through slope difference of voltage and current sampling points, time alignment of electric signals is realized, a ripple change sequence is constructed based on amplitude difference, classification is carried out according to hierarchical intervals, and the number of times and amplitude accumulation of various ripples are counted to form a ripple hierarchy coefficient. The method comprises the following steps: generating adhesion grade information by combining the deviation degree of slope change in a starting stage, dividing a stirring stage according to a power symbol continuous section, eliminating a starting interference section, calculating a power cumulant of an effective section to form a stage energy consumption structure parameter, generating a torque fluctuation index according to the comparison of steady-state power and rotation quantity, and performing grade screening. And viscoelastic structure parameters are formed.

The application discloses a self-resetting viscoelastic-friction composite plate damper, which comprises a middle layer plate and a side plate component A, a middle layer inserting component B and a self-resetting system C; the middle layer plate and the side plate component A and the middle layer inserting component B are oppositely arranged; the self-resetting system C is arranged on the middle layer plate and the side plate component A and the middle layer inserting component B; the damper can be directly installed at a frame support, energy consumption is mainly borne by the damper, and the damper has a self-resetting unit; the damper dissipates seismic energy through the joint intervention of Cu friction plate components and vulcanized rubber friction components; and after an earthquake, the structure can be restored to use as soon as possible by replacing the friction plate or the friction component which loses the friction performance.

Devices and methods for measuring the mechanical properties of soft materials, including biological materials, are disclosed. Embodiments include devices and methods wherein sensors and actuators are collocated with one another reducing complexities and uncertainties of traditional devices with separate sensors and actuators that are merely coupled to one another. Additional embodiments include devices and methods capable of applying large strains during the stimulation and sensing (deformation and measurement) process of determining the mechanical properties, which is some embodiments enables the determination of strain-dependent stiffness and viscoelasticity.

The invention discloses an uncertain quantization and propagation method for constitutive parameters of a viscoelastic composite material, which comprises the following steps of: developing a multi-scale micro-mechanical model on the basis of a fractional order differential and average field homogenization theory so as to reveal a nonlinear relation among component material performance, microstructure parameters and macroscopic viscoelasticity. And secondly, the Levenberg-Marquardt optimization algorithm and the Physics-Informed Neural Network proxy model are used for realizing the self-adaptive optimization of the sampling initial conjecture and the improvement of the calculation efficiency. Therefore, a Bayesian probability model is established, and model parameter posterior distribution is calculated by adopting a Markov chain Monte Carlo method so as to evaluate uncertainty, correlation and model errors of parameters. And finally, calculating posterior prediction distribution of the overall response, the constitutive response and the noise response. According to the method, the provided multi-scale Bayesian framework provides an effective way for optimizing component material performance and microstructure parameters, and the method has an important guiding effect on design of advanced viscoelastic composite materials with higher bearing capacity.

The invention discloses an impact-resistant high-thermal-conductivity polyphenylene sulfide composite material and a preparation method thereof, and relates to the technical field of plastic processing. The preparation method comprises the following steps: S1, preparing a highly oriented PPS fiber insert; s2, preparing the impact-resistant high-thermal-conductivity PPS composite material. The invention provides an impact-resistant high-thermal-conductivity PPS composite material and a preparation method thereof.The preparation method comprises the steps that firstly, high-melt-viscosity and high-temperature-resistant aromatic polyamide is adopted for improving the viscoelasticity of PPS resin, functionalized polysulfone-based resin serves as a compatibilizer for enhancing the interfacial compatibility of PPS / aromatic polyamide, and therefore the stretchability and the stretching orientation degree of PPS are improved; pPS composite fibers are obtained through a melt spinning machine, a fiber solid-phase high-power stretching-annealing forming process is established, and the high-toughness and highly-oriented PPS composite fiber material is obtained.

A viscoelasticity measurement method (100, 700) and an ultrasonic measurement system (1000), the viscoelasticity measurement method (100, 700) comprising: emitting an acoustic radiation force pulse to a subject to be measured to generate a shear wave in a region of interest of the subject to be measured (S110); emitting a first ultrasonic wave to track the shear wave to the region of interest and receiving a first ultrasonic echo of the region of interest to obtain first ultrasonic echo data (S120); obtaining a shear wave signal of the region of interest from the first ultrasonic echo data (S130); extracting shear wave components of at least two different frequencies from the shear wave signal (S140); determining phase velocities of the shear wave respectively according to the shear wave components of the at least two different frequencies (S150); determining viscosity information reflecting viscosity of the region of interest according to the at least two phase velocities (S160); and outputting the viscosity information (S170). The viscosity information of the region of interest can be determined by one viscoelasticity measurement.

The present application relates to the field of shoe sole design, and specifically relates to a lattice structure rod diameter reverse design method, comprising the following sequentially executed steps: S1: constructing a unit cell structure; S2: defining parameters: connecting rod diameter d1, main rod diameter d2, fiber rod diameter d3, unit cell structure side length L and shape coefficient alpha; S3: generating a test structure; S4: obtaining the super-elasticity data and viscoelasticity data of the test structure, and establishing a finite element analysis model of the test structure; S5: setting each parameter, simulating and analyzing the test structure under each combination, obtaining the mechanical performance indicators of each test structure, and constructing a mechanical performance indicator database using the obtained mechanical performance indicators; S6: determining a unique rod diameter combination; S7: generating a lattice structure for filling a shoe sole according to the obtained rod diameter combination; the design method can quickly realize the reverse design of the rod diameter parameters in the lattice lattice structure, quickly iteratively obtain the rod diameter combination parameters under the target mechanical performance, and save design costs.

The invention discloses an upward hole on-site mixed porous granular ammonium nitrate fuel oil explosive which is characterized by comprising the following raw materials in parts by mass: 92-96 parts of porous granular ammonium nitrate, 3-4 parts of an oil phase material, 0.5-2 parts of a hydroxyl-terminated telechelic polymer, 0.45-1.8 parts of a chain extender and 0.05-0.2 part of a curing agent. Wherein the hydroxyl-terminated telechelic polymer can react with the curing agent to form a cross-linked high polymer material, so that the adhesive property of the explosive and the anti-falling property of the explosive when the explosive is used in an upward hole are enhanced; the chain extender further optimizes the viscoelasticity of the explosive by extending a polymer chain segment and adjusting the crosslinking density, so that the anti-falling performance of the explosive is more excellent; the oil phase material can be tightly combined with the porous granular ammonium nitrate, so that the explosion performance of the explosive is improved. The on-site mixed and loaded porous granular ammonium nitrate fuel oil explosive provided by the invention has excellent anti-falling performance during upward hole loading, also has an excellent detonation effect, and has a relatively high popularization value.

The application discloses a kind of hydrophobic polyurethane coating gas-suspended proppant based on lotus effect and its preparation method and application, it is related to oil and gas well stimulation technical field.The application prepares the hydrophobic polyurethane coating gas-suspended proppant based on lotus effect by using fluidized bed to spray polyurethane mixed solution on the surface of proppant after hydrophobic modification of polyurethane.Because of the porous hydrophobic structure and special surface papillary structure of polyurethane itself, the surface of proppant coated by modified polyurethane will form a layer of gas film based on lotus effect, and finally form gas-suspended proppant that can freely suspend in low viscosity water or even clear water.The gas-suspended proppant coated by gas film and polyurethane has excellent suspensibility and stability, and can freely suspend in water, reduces the requirement for fluid viscoelasticity, can be applied to more fracturing scenes, and does not need to use a large amount of organic thickening agent, reduces the damage to reservoir, and the preparation process is simple, low in cost and environmentally friendly.

A vibration damping sheet (10) has a sheet body section (30) with air impermeability and flexibility, and support sections (32) that project from the sheet body section (30) and are spaced apart from one another. End surfaces (32a) of the support sections (32) are in contact with a base plate (12), which is a target object, and the support sections (32) support the sheet body section (30). End sections of the support sections (32) that encompass the end surfaces (32a) have viscoelasticity and a magnetic force. A magnetic attraction force per unit area of ​​the vibration damping sheet (10) is 24 Nf / m². 2 or more and 390 Nf / m 2 or less. Such a structure effectively dampens vibrations at least in the range of 300 Hz to 500 Hz. The vibration damping sheet (10) can be used without being fused to the target object and exerts a high damping effect without increasing mass.

The utility model relates to the technical field of lightning protection nets, in particular to a lightning protection net fixing device which comprises a rack, a transmission assembly, a welding assembly and a fixing assembly. The fixing assembly is composed of a fixing table, a telescopic table and a chuck. According to the lightning protection net fixing device, through linear movement of the telescopic table, the chuck is aligned with the positioning datum plane of the workpiece to be clamped, it is ensured that the clamping center coincides with the axis of the workpiece, the second screw is manually or electrically rotated, the rotating motion of the screw is converted into linear motion of the clamping blocks, and the two clamping blocks move in the opposite directions; when the rubber lining makes contact with the surface of a workpiece, elastic deformation is generated, multi-point contact pressure distribution is formed, the viscoelasticity characteristic of a rubber material can compensate for the microcosmic unevenness of the surface of the lightning protection net, uniform clamping force is achieved, the screw rod is reversely rotated, the clamping block retreats under the action of the reset spring or the gravity, and rapid unloading of the workpiece is achieved.

The application discloses a surfactant oil displacement agent for viscoelastic binary composite flooding and a preparation method thereof, and relates to the technical field of oil exploitation. The oil displacement agent is a polymer and surfactant binary composite system, which is compounded by a water phase and an oil phase in a specific proportion. The water phase accounts for 5-45% and the oil phase accounts for 55-95% to expand the range. The water phase contains alcohol and water, and the oil phase contains a surfactant, a self-made thickening agent and white oil. Through reasonable compounding of components and optimization of the preparation process, the application solves the technical problems of poor temperature resistance and salt resistance, weak environmental protection and high cost of the existing viscoelastic surfactant, has excellent viscoelasticity, oil washing efficiency and environmental compatibility, can significantly reduce the oil / water interfacial tension, promote the desorption and dispersion of crude oil, improve the recovery rate, and is suitable for high-temperature and high-salt oil reservoir exploitation.