106 results about "Radial stress" patented technology

The present disclosure relates to the technical field of stability control of surrounding rock of tunnelling, and provides an excavation compensation method for tunnelling in deep rock engineering, including: acquiring an engineering geological information of the tunnelling in deep rock engineering; determining an engineering hazard type based on the engineering geological information; determining an excavation compensation support strategy for the surrounding rock of the tunnelling in deep rock engineering based on the engineering hazard type; and performing a supplementary support control on the surrounding rock of the tunnelling in deep rock engineering based on the excavation compensation support strategy. Through the supplementary support strategy, the difference value between a radial stress of the surrounding rock of the tunnelling in deep rock engineering and an initial crustal stress can be reduced to within a preset approximate value range, further effectively preventing a stress concentration phenomenon occurred in a tangential stress.

The invention discloses a TBM hob three-way rock breaking force prediction method and system based on a rotary cutting mode, and the method comprises the steps: building a hyperbolic function model of the cutting edge width and penetration depth of a hob, and optimizing the geometric structure of the hob to adapt to different rock stratums; an effective contact radius and a contact angle are calculated through a coupling motion trail equation of revolution and rotation of the hob; fitting a pressure distribution coefficient in combination with pre-test data, constructing a Hertz-Weibull stress coupling analysis model, and accurately representing stress distribution in the cutting direction and the radial direction; on the basis of contact pressure integration and stress decomposition, respectively deriving explicit calculation formulas of vertical, rolling and lateral rock breaking forces, and dynamically adjusting the rotating speed of the cutterhead, the propelling pressure and the hob spacing according to a rock breaking force prediction result. According to the method, the rock breaking force prediction precision in the complex rock stratum is remarkably improved, the TBM construction efficiency and the cutter service life are optimized, the over-excavation risk and energy consumption are reduced, and the method is suitable for intelligent tunneling control of tunnel engineering.

The invention relates to the technical field of cables, and discloses a high-voltage cable with high safety performance. The cable comprises a conductor, a conductor shielding layer, an insulating layer, an insulating shielding layer, an inner buffer layer, a protective layer, a reinforced steel cable, an outer buffer layer and an outer protective layer which are sequentially and coaxially arranged from inside to outside. The protective layer is composed of a plurality of sets of protective units arranged in an array mode in the axial direction, and each protective unit is of an annular structure defined by a plurality of protective pieces in the circumferential direction. The inner wall and the outer wall of the protection piece are arc-shaped, steel cable grooves are formed in the two sides of the protection piece, and hollow grooves are formed in the protection piece; the multiple protection units are in staggered butt joint to form a continuous spiral surrounding structure. And the reinforcing steel cable is spirally wound and embedded in a spiral channel formed by the steel cable grooves of the protective sheets. Uniform conversion and dispersion from axial tension to radial stress are realized, the design of the rhombic protection sheets and the hollowed-out grooves is combined, the tensile resistance, extrusion resistance, impact resistance and cutting resistance of the cable are remarkably improved, and the cable is suitable for a complex laying environment.

The invention discloses a construction period surrounding rock-support system cooperative bearing analysis method, which is characterized in that the radial stress release process of the tunnel inner wall surrounding rock in the construction period is divided into n calculation steps, and after a support system is constructed, each calculation step comprises a preliminary approach analysis stage and a precise convergence analysis stage; in the initial approaching analysis stage, the displacement increment of the ith calculation step is utilized to estimate the support load increment of the (i + 1) th calculation step, and the stress, strain and displacement of the surrounding rock are solved; if the absolute value of the difference value of the surrounding rock displacement and the support displacement is smaller than a set error threshold value, calculation is ended; otherwise, entering a precise convergence stage to correct the support load. The method has the advantages that the complex iterative calculation process in the traditional dichotomy is simplified, and the solving process of the surrounding rock-support system is divided into two stages of preliminary approaching and accurate convergence. The calculation times are obviously reduced, and the calculation precision is ensured.

The application discloses a high-performance motor rotor core, comprising rotor laminations, wherein a plurality of magnetic steel slot groups are arranged on the rotor laminations in a circumferential direction; the application has simple structure and reasonable design; stress reduction structures with central symmetry characteristics are arranged to effectively guide and release main radial stress in the magnetic bridge area, optimize stress distribution, avoid fatigue cracks caused by local stress concentration, improve fatigue life and structural safety margin of the magnetic bridge, and improve NVH performance, reduce electromagnetic harmonics, and improve stability and quietness of motor operation; in addition, the overall magnetic steel slot layout is optimized to realize reasonable reduction of material use and lightweight design of the rotor core, and improve power density and dynamic response capability under the premise of guaranteeing electromagnetic performance.

The application relates to the technical field of cables, and discloses a high-voltage cable with high safety performance. The cable comprises, from inside to outside, a conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, an inner buffer layer, a protective layer, a reinforcing steel cable, an outer buffer layer and an outer protective layer; the protective layer is composed of multiple groups of protective units arranged in an axial array, each protective unit is formed into a circular ring structure by multiple protective sheets arranged in a circumferential direction, the cross section of the protective sheet is in a prismatic shape, the inner and outer walls are in arc shapes, steel cable grooves are arranged on the two sides, and a hollow groove is arranged in the interior; the multiple protective units are staggered and connected to form a continuous spiral winding structure; and the reinforcing steel cable is spirally wound and embedded in the spiral channel formed by the steel cable grooves of the protective sheets. The application realizes uniform conversion and dispersion of axial tension into radial stress, and combines the design of the rhombic protective sheet and the hollow groove, so that the tensile resistance, extrusion resistance, impact resistance and cutting resistance of the cable are significantly improved, and the cable is suitable for complex laying environments.

The present application relates to the technical field of coal mine equipment, and discloses a self-moving device and a hydraulic system thereof, which comprises a base provided with sliding rails, two sliding bodies sliding along the sliding rails, two locking mechanisms respectively arranged on the sliding bodies and a driving mechanism connected between the two sliding bodies; wherein the locking mechanism is installed on the sliding body through a first hinged mechanism and cooperates with a limiting block to perform floating limiting, and the two ends of the driving mechanism are connected with the sliding bodies through a second hinged mechanism; each mechanism cooperatively acts to realize step-by-step displacement through alternating locking and driving. The present application realizes non-rigid connection through floating limiting of the hinged mechanism and the limiting block, automatically compensates the perpendicularity and position deviation between the base and the sliding body, releases radial stress, effectively prevents damage of the locking mechanism and the driving mechanism caused by unbalanced load, and ensures the stability and reliability of step-by-step displacement of the device.

The invention relates to a metal plate plastic forming method, in particular to a stamping-bulging composite forming method for an annular corrugated diaphragm of a welded expansion joint. The stress state of the formed diaphragm can be adjusted, the inner side pressure stress of the bent position of the corrugated diaphragm is converted into tensile stress, sufficient plastic deformation occurs in a formed area, and springback is reduced. By adjusting the stamping drawing force and the bulging internal pressure, the equivalent stress distribution of the diaphragm forming area can be more uniform, the stress difference of all the areas is reduced, then the warping of the forming area is reduced after the load is removed, and the forming precision is improved. The large radial stress can be generated in the diaphragm forming area only by applying small pressure to the middle area of the diaphragm blank, the large radial stress is used for adjusting the stress state of the diaphragm forming area, and therefore the high requirement of large bulging pressure on equipment and a die can be avoided.

The invention discloses a control method and device of a magnetic suspension rotor, a magnetic suspension system, a storage medium and a computer program product. A position detection assembly used for detecting the radial position of the rotor and a temperature collection assembly used for collecting the surface temperature of the rotor are arranged. The method comprises the steps that in the rotor operation process, current radial position data, collected by a position detection assembly in real time, of a rotor and current temperature data, collected by a temperature collection assembly in real time, of the rotor are obtained; calculating the real-time position deviation of the rotor according to the current radial position data; judging whether the rotor has radial expansion or not according to the real-time position deviation; if it is determined that radial expansion exists in the rotor, the thermal expansion coefficient of the rotor is calculated according to the current temperature data and the real-time position deviation; and generating a control signal based on the real-time position deviation and the thermal expansion coefficient, and adjusting the radial stress state of the rotor according to the control signal so as to correct the suspension position of the rotor. According to the scheme, rapid dynamic compensation of the rotor is realized.

The invention discloses a self-adaptive lap joint flange for an outer pipe of a fuel gas double-wall pipe of a marine low-speed diesel engine, which is movably connected to the end part of the outer pipe of the double-wall pipe and comprises an inner hole, the inner hole is a stepped hole, a gap is formed between the inner hole and a flange of the inner pipe of the double-wall pipe, and the inner hole comprises a large hole and a small hole which are coaxially connected; the inner wall of the small hole is a sliding sealing face, and a sealing ring is arranged between the sliding sealing face and the periphery of the outer pipe. After the inner pipes are assembled in a paired mode, if centering deviation of the outer pipes is caused by machining errors, radial stress generated by deformation of the outer pipes can be eliminated by adjusting gaps between the lap joint flanges and the outer pipes, and the lap joint flanges can axially slide along the outer pipes; the axial stress of the flange on the pipeline can be reduced or eliminated through sliding of the lap joint flange, so that the pipeline is prevented from being broken. The reliability, stability and safety of gas pipeline connection are improved.

The invention provides a physical experiment simulation system, and relates to the technical field of material mechanics tests, the physical experiment simulation system is based on an actual stress-strain curve, a simulation test piece three-dimensional model with a gap is established, cells are divided, a typical plane is selected, a groove cell, a slope bottom cell, a stretching cell and a gap cell are divided, and the physical experiment simulation system is obtained. The method comprises the following steps of: performing accurate simulation analysis on each position conveniently, directly simulating a real stretching effect in a stretching cell, acquiring radial stress at a groove cell according to a rotation trend generated by an intermolecular acting force, judging whether a notch cell and a slope bottom cell which serve as stress concentration points are in an elastic deformation stage or not through a vonMises yield criterion, and judging whether the notch cell and the slope bottom cell are in an elastic deformation stage or not. And the deformation condition of each cell caused by the influence of the stress is visualized, and the process and the result of the abnormal test result caused by the gap are intuitively displayed.

The invention discloses a reinforcement-solid waste concrete bonding strength prediction method based on an improved failure criterion, and belongs to the field of reinforcement-solid waste concrete mechanical modeling. The method comprises the steps that a simplified circular section is divided into a plastic area and an elastic area, and the two areas and a radial stress calculation equation provided by the passive constraint component are determined respectively; putting forward an extended Mohr-Coulomb criterion, and defining yield lines of an interface shearing behavior and a sliding behavior under a sufficient constraint condition; introducing a crack expansion factor to correct the strength of the solid waste concrete, and searching a to-be-optimized parameter value through a particle swarm optimization algorithm; and embedding the existing physical model into the residual error network loss function item to construct a residual error network model. The method can quantitatively describe the evolution law of the bonding strength of the reinforcing steel bar-solid waste concrete interface under different material and structure parameters, is high in prediction precision and strong in extrapolation capability, and is suitable for anchoring design and mechanical property evaluation of a reinforcing steel bar-solid waste concrete structure.

The utility model relates to the technical field of screws, and discloses an anti-loosening screw for high-strength steel beam connection, which comprises a screw body, the bottom of the screw body is fixedly connected with a dovetail, the outside of the screw body is in threaded connection with a self-locking nut, the outside of the screw body is in threaded connection with a first flat gasket, and the first flat gasket is in threaded connection with a second flat gasket. The outer portion of the screw body is in threaded connection with a hexagon nut, a second flat gasket, an integrated nut, a plastic ring and a bowl-shaped waterproof gasket. The outer portion of the screw body is in threaded connection with the hexagon nut, the second flat gasket, the integrated nut, the plastic ring and the bowl-shaped waterproof gasket. According to the anti-loosening screw, high fastening force and an anti-loosening effect are provided, stable connection is ensured, vibration resistance is achieved, the service life is prolonged, the sealing performance, the vibration resistance and the water resistance of connection are enhanced, meanwhile, a good fastening effect and surface protection are provided, the radial stress area of the screw body and the nut is increased, and the anti-loosening effect is achieved.

The present application relates to the technical field of wheel stress relief, in particular to a universal flexible thrust stop arm device. The device comprises an auxiliary mechanism, a frame arranged at both ends of the auxiliary mechanism, and an OPG speed sensor base. The auxiliary mechanism is composed of a sleeve rod body and a push rod in sliding connection with the inside of the sleeve rod body. A ball head body is arranged at the end of the sleeve rod body and the push rod. When the ball head body is in conformity with the base body and the end cover body, the ball head body is in rotational connection with the base body and the end cover body. Thus, when the subway vehicle generates axial and radial stress during operation, the sleeve rod body and the push rod can be inclined at a certain angle, avoiding the damage of the elastic bush structure, the loosening of the elastic bush of the OPG speed sensor base, the loosening of the fastening round nut of the OPG speed sensor base, the bearing jamming of the OPG speed sensor base, or the damage of the OPG speed sensor base.

The utility model relates to high -voltage electrical connection technical field, and disclose a kind of high-voltage connector butt joint structure with floating compensation function, including connector body and floating compensation device, connector body includes plug and socket, plug top is equipped with pin, socket is L letter shape structure, socket inner wall is equipped with the slot matched with the position of pin, floating compensation device is located on socket, floating compensation device includes the radial horizontal compensation component that socket is relative to plug can move along the horizontal direction perpendicular to butt joint axis, and axial compensation component moves along butt joint axis direction, axial compensation component is located on radial horizontal compensation component. Solve traditional rigid structure adaptation problem, through the synergistic effect of radial horizontal compensation component and axial compensation component, it can be flexibly compensated to installation error, avoid the radial stress generated by forcible butt joint, reduce assembly difficulty and improve efficiency.

The invention relates to the field of a stress calculation method of an underground pipe column, in particular to a three-dimensional stress field real-time calculation and safety evaluation method and system of the underground pipe column, and the method comprises the steps: collecting underground multi-source data; three-dimensional stress calculation is carried out on the basis that the tubular column material is isotropic and the stress-strain relation conforms to the linear elasticity theory; correcting a safety assessment result by taking the yield strength as a constraint condition, calculating thermal stress according to the temperature change values of the well bottom and the well mouth, and correcting the total stress; radial stress is corrected by combining radial pressure difference caused by internal pressure and external pressure, thermal stress is corrected in real time according to temperature change values of a well bottom and a well mouth, corrosion rate is calculated according to change of corrosive gas content, and a stress distribution result is corrected; and performing risk grading and early warning according to the relationship between the total stress and the yield strength. According to the method, precise modeling and calculation are carried out on the superimposed effect of stress in different directions, and the calculation precision is remarkably improved.

The invention provides a method for calculating friction inclined pile bearing capacity loss caused by excavation of a tunnel composite stratum. The method comprises the steps that tunnel parameters of a shield tunnel, structural parameters of an existing pile foundation and physical and mechanical parameters of a soil body are obtained; equivalently converting the elastic modulus of the multi-layer composite soil body into the elastic modulus of a homogeneous single stratum, analyzing the range and boundary radius of a plastic region and an elastic region of the soil body caused by tunnel excavation, and establishing a radial stress and circumferential stress distribution model of any position of the soil body; discretizing the inclined pile along the pile length, judging a stress area according to the distance from each point of the pile body to the center of the tunnel, calculating the main stress of the corresponding soil body, and solving the normal stress change of the pile-soil contact surface through conversion of an included angle between a pile shaft and the main stress direction; and calculating the side friction resistance change of each point of the pile body according to the normal stress change, obtaining the total bearing capacity loss along the pile length integral, and calculating the bearing capacity loss factor of the friction pile foundation. The calculation method disclosed by the invention is high in operability, simple and convenient in calculation and wide in application prospect.

The utility model relates to the technical field of casing couplings, and discloses a thermal compensation oil casing coupling which comprises a connecting hoop and a pipeline, a protection assembly is arranged on the outer wall of the connecting hoop, and the protection assembly is used for protecting the connecting hoop and the pipeline from excessive deformation and damage in the axial direction when the connecting hoop and the pipeline expand with heat and contract with cold. An adjusting assembly is arranged on one side of the connecting hoop and used for dynamically adjusting the pre-tightening force, the protection assembly comprises a limiting ring, the limiting ring is fixedly connected to the outer wall of the connecting hoop, and the other side of the elastic corrugated pipe is fixedly connected to the inner side of the connecting ring. According to the utility model, when the connecting hoop is tightened, the gasket is extruded and deformed, and meanwhile, the elastic corrugated pipe achieves the effect of buffering the axial stress and the radial stress by virtue of the good elasticity and the telescopic characteristic of the elastic corrugated pipe when the connecting hoop and the pipeline expand with heat and contract with cold, so that the problem that the traditional equipment cannot adapt to expansion with heat and contract with cold is solved; and the working efficiency of mining operation is improved.

The invention discloses a numerical control gear shaping machine based on double-drive synchronous compensation, and belongs to the technical field of gear shaping machines. Comprising a lathe bed, a stand column vertically and fixedly connected to one side of the top of the lathe bed, a tool rest slidably connected to one side of the stand column, a slotting cutter detachably installed at the bottom of the tool rest, a radial sliding table slidably arranged on the other side of the top of the lathe bed and a sliding plate slidably arranged on the top of the radial sliding table. The workbench is rotationally arranged at the top of the sliding plate; and the rotating motor drives the workbench to rotate. The radial feeding system composed of the servo motor, the ball screw and the sliding block is symmetrically arranged at the top of the radial sliding table, driving force can be applied to a machining part in a balanced mode from the two sides, radial stress generated in the scene of large-load machining or large-diameter workpiece machining can be effectively offset, the deflection deformation amount of the ball screw is greatly reduced, and the machining precision is improved. Radial positioning precision fluctuation caused by lead screw deformation is avoided, the precision stability of key parameters such as the tooth pitch and the tooth shape in the gear machining process is finally ensured, and the precision gear manufacturing requirement is met.

The invention relates to the technical field of material analysis, and discloses a wire cold bending crack resistance evaluation method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining the radial stress and shear stress of a preset test point under each bending degree when a target wire is subjected to symmetric cold bending according to different bending degrees, determining the key bending degree based on the shear stress, and determining the bending degree of the target wire according to the key bending degree; determining a shear stress influence factor according to the shear stress corresponding to the key bending degree, determining a radial stress influence factor according to the radial stress corresponding to the initial bending degree, the tail end bending degree and the later bending degree, and determining cold bending crack resistance parameters of the target wire according to the shear stress influence factor and the radial stress influence factor. The method can break through the limitation that the existing standard only judges whether the crack exists or not, realizes full-dimension quantitative evaluation of the crack initiation tendency, the expansion direction and the expansion rate of the wire material, covers the core key index of the cold bending crack resistance, and improves the accuracy of wire material quality evaluation.

The invention discloses a stress sensitivity test method for loss and magnetization characteristics of an amorphous nanocrystalline iron core, and relates to the field of soft magnetic material performance tests.The method comprises the following steps that stress distribution and size parameters of the iron core are obtained through finite element simulation when different interference fit exists between the amorphous or nanocrystalline iron core and a titanium alloy sleeve set; processing according to the size parameters of the iron core to obtain an iron core sample; assembling the iron core sample, the titanium alloy sleeve group and the patch type pressure sensor; a soft magnetic material magnetic performance testing system is adopted to test loss characteristics and magnetization characteristics of iron core samples excited at different frequencies under different stresses; according to the invention, the stress of the iron core sample can be adjusted and measured, and the quantitative relation of the influence of the radial stress which is approximately uniformly distributed in the amorphous or nanocrystalline iron core on the loss and magnetization characteristics of the iron core can be accurately obtained; therefore, data support is provided for improving the accuracy of optimization design and performance analysis of equipment such as an amorphous alloy high-speed motor and a nanocrystalline high-frequency transformer.

The transformer comprises an iron core, four steel channels are symmetrically arranged at the upper end, the lower end, the front end and the rear end of the iron core, the steel channels are connected through bolts, and three windings are evenly arranged in the middle of the iron core. The winding comprises long-edge arcs symmetrically arranged in the vertical direction and short-edge arcs symmetrically arranged in the left-right direction, the tangent lines of the long-edge arcs and the short-edge arcs at the connecting positions of the long-edge arcs and the short-edge arcs form angles of 2-4 degrees, and eight positioning and clamping mechanisms are symmetrically arranged in the vertical direction and the left-right direction of the winding. The positioning and clamping mechanism is installed at the joint of the long-edge arc and the short-edge arc and supports and fixes the winding in the longitudinal direction and the transverse direction, the winding structure composed of the short-edge arc and the long-edge arc is matched with the positioning and clamping mechanism to provide continuously-enhanced supporting force, and therefore the winding can be fixed in the longitudinal direction and the transverse direction. The radial stress is reduced by more than 20% compared with that of a traditional long circular winding, and the winding is effectively prevented from being damaged under short-circuit rapid impact.

According to the multi-supporting-rod seat lifting device and the electric vehicle comprising the multi-supporting-rod seat lifting device, the main supporting rod is combined with the at least one auxiliary supporting rod, the main supporting rod can conduct main loading, and the at least one auxiliary supporting rod can disperse dynamic stress and share radial stress; the problems that a traditional single supporting rod is provided with a single longitudinal stress path, loads are concentrated in the middle of a rod body, so that the bending moment is too large, and port fatigue is loose and becomes large are avoided, and the overall service life is longer. Meanwhile, one-rod or multi-rod unlocking of the main supporting rod or at least one auxiliary supporting rod can be achieved through the self-locking adjusting mechanism, and multi-rod unlocking can be achieved through single-time pressing.

The application relates to a semi-analytical method for analyzing the response of deep-buried tunnel excavation, which comprises the following steps: step 1) establishing a deep-buried circular tunnel excavation mechanical model, and solving the stress at the elastic-plastic boundary in the model by using a numerical method, wherein the stress comprises three components, namely radial stress, tangential stress and axial stress; step 2) dividing the plastic zone into n circular rings based on the finite difference method, and sequentially solving the stress components of each circular ring from the elastic-plastic boundary to the tunnel wall; step 3) solving the radius of each circular ring based on the stress components of the circular rings and the balance equation; step 4) decomposing the strain components, and solving the strain components of each circular ring based on the finite difference method; and step 5) solving the radial displacement based on the strain components. Compared with the prior art, the application has the advantages of improving the calculation efficiency of the three-dimensional semi-analytical method of finite difference.

The utility model discloses a real -time intelligent voice microphone based on noise reduction technique, including upper structure and lower structure, is equipped with the butt joint structure between upper structure and lower structure, through the multiple cooperation of thread connection, boss and recess joint, positioning column and positioning hole locking, middle ring cover and slot insertion, form three -dimensional locking structure, effectively resist vibration, external force impact etc. interference, avoid component loose, guarantee the stability of audio acquisition, solved the single locking structure of existing in mobile conference, outdoor recording etc. the problem of loose in scene, can be stably applied to various complex environment, make the noise reduction structure of microphone main part can be more focused on filtering environmental noise, the basic pre -tightening force is provided to thread connection, the circumferential rotation is limited to boss and recess joint, and the axial displacement is limited to positioning column and positioning hole cooperation, and the radial stress is dispersed further to middle ring cover and slot insertion, and four locking modes form complementation from different mechanical directions.

This invention discloses a residual stress detection platform for axles, relating to the field of rail vehicle inspection technology. The axle is supported by a rotating support module mounted on a tilting support module. A rotating drive module drives at least one support roller to rotate, causing the axle to rotate at different angles towards the detection instrument. This allows for detection at different angles on the same cross-section, ensuring the accuracy of measurement data and the consistency of repeated measurements. The detection instrument is placed on the top plate of a movable detection assembly. Moving wheels on the chassis move the instrument relative to the axle. After positioning, the height is adjusted via a lifting mechanism. For radial stress detection on cross-sections far from the end, a first translation stage can be used to move the instrument, extending it beyond the top plate and lengthening its reach, making it suitable for detecting axles of greater length.

The application provides a method for determining the bonding strength of steel bar-concrete after high temperature, comprising: obtaining the mechanical parameters of concrete after high temperature, which include the elastic modulus, tensile strength and ultimate tensile strain of concrete after high temperature; determining the three-section tensile constitutive model of concrete after high temperature according to the mechanical parameters of concrete after high temperature; solving the radius of the concrete cracking area corresponding to the maximum radial stress based on the three-section tensile constitutive model according to the thick-walled cylinder model and the dispersion crack assumption; obtaining the maximum radial stress of the concrete cover on the steel bar after high temperature according to the radius of the concrete cracking area corresponding to the maximum radial stress; and determining the bonding strength of steel bar-concrete after high temperature according to the relationship between the bonding strength of steel bar-concrete and the maximum radial stress. The application can effectively simulate the bonding strength of steel bar-concrete after high temperature, and the prediction result is accurate and practical.

The utility model discloses a clamping mechanism for bicycle accessory machining, and relates to the technical field of bicycle accessory machining. Comprising an L-shaped supporting seat, a connecting rod is fixed to the top of the left side of the L-shaped supporting seat, and a socket rod is arranged on a rod body of the connecting rod; at least two clamping assemblies are arranged on a rod body of the socket rod, a driving piece is arranged in the socket rod, and after the hollow cylindrical part is inserted into the socket rod, the driving piece drives the clamping assemblies to clamp the hollow cylindrical part. The clamping device is provided with the socket rod, the clamping assembly and the abutting assembly, after the hollow cylindrical part is inserted into the socket rod, the inner wall of the hollow cylindrical part is extruded through the abutting assembly, the interior of the hollow cylindrical part is clamped, and the end of the left side of the hollow cylindrical part is extruded through the abutting assembly; and therefore, the socket rod is further prevented from rotating due to radial stress, and the machining stability of the hollow cylindrical part is improved.

The application discloses a casing short service life determination method, device, medium and electronic equipment. The method comprises the following steps: determining the position of surface water in casing short according to the current geological condition of injection-production well, and setting the position of the surface water as the corrosion core position of the casing short; calculating the total radial stress, total circumferential stress and total axial stress corresponding to the corrosion core position at an initial time node, so as to calculate the equivalent stress corresponding to the corrosion core position at the initial time node; and determining the safe service life of the casing short according to the equivalent stress and yield strength. The application can improve the accuracy of calculating the safe service life of the casing short.