116 results about "Shear load" patented technology

The invention provides a heat-water-force coupling experimental device and a testing method based on dynamic true triaxial electromagnetic Hopkinson bar system loading. The experimental device comprises an X-axis dynamic loading system, a Y-axis lateral anti-seepage loading system, a Z-axis normal static pressure servo control loading system, a seepage system, a temperature control system and a data monitoring and collecting system. According to the device, on the basis of a dynamic true triaxial electromagnetic Hopkinson bar system, a shear loading module, a temperature regulation and control module and a seepage control module are creatively integrated, so that the true working condition of a deep rock mass under the coupling action of dynamic disturbance, osmotic pressure and temperature is simulated. The device breaks through the limitation that a traditional experiment system is difficult to realize multi-field coupling loading under a high-speed shearing condition, and provides an experiment means for dynamic response research of fractured rock mass under a complex multi-field environment.

The invention belongs to the field of prediction of fatigue failure caused by surface defects under rolling contact loads, and particularly relates to a rolling contact fatigue pitting corrosion prediction method considering crystal plasticity, a corresponding computer readable storage medium and electronic equipment. The method comprises the following steps: S1, constructing a crystal plastic constitutive model of a coupling damage accumulation theory; s2, developing the model in the step 1 into a UMAT subprogram by using Fortran, and embedding ABAQUS into the UMAT subprogram; s3, establishing a representative volume element crystal plastic finite element model; s4, applying a periodic boundary condition and a shear load, obtaining a shear stress-strain curve, carrying out a torsional fatigue test, obtaining fatigue damage parameters of the material, and determining constitutive model parameters of the material; s5, establishing a crystal plastic finite element model of the roller and raceway contact pair; s6, applying boundary conditions in two steps; and S7, observing a damage evolution path to the surface, and obtaining the rolling contact fatigue pitting corrosion life. The method can fill the blank of rolling contact fatigue pitting corrosion prediction methods at present.

The invention discloses an intelligent identification method for a rock tension-shear rupture mechanism based on acoustic emission RA-AF parameters, and belongs to the technical field of intelligent identification. The method comprises the following steps: carrying out indirect tension test and variable-angle shear test on rock, acquiring RA-AF data of the rock under tension and shear loads by adopting an acoustic emission technology, and respectively constructing RA-AF standard databases corresponding to tension and shear fracture mechanisms based on a DBSCAN clustering algorithm; wherein 4 / 5 is used as training set data, and 1 / 5 is used as test set data. A probabilistic neural network is used for learning RA-AF data feature information of a pulling and shearing fracture mechanism, an intelligent classification model of the pulling and shearing fracture mechanism is established, the accuracy rate of the model is detected, and the model which reaches the detection standard through adjustment is applied to quantitative recognition of the fracture mechanism of the same rock under different static loads. According to the method, the data processing workload of workers can be reduced, and the classification efficiency is improved.

The invention discloses a torsional shear mechanical property testing device and method for a hollow cylinder structure, and belongs to the technical field of mechanical structure testing. The device comprises an axial driving mechanism, a radial driving mechanism and a fixed supporting mechanism. The axial driving mechanism is connected with the axial actuating pressure plate through an actuating main shaft; the radial driving mechanism comprises a radial driving mandrel of an inverted conical structure and a driving sliding plate matched with the radial driving mandrel, and axial movement of the main shaft is converted into radial expansion movement through conical face fit. The fixed supporting mechanism is a closed supporting system composed of an outer sleeve, an upper cover plate and a base. Through the unique inverted conical structure design, independent or synchronous application of axial compression, radial expansion and torsional shear loads can be achieved, and the complex stress working condition is effectively simulated. The device has the advantages of being stable in structure, high in testing precision, easy and convenient to operate and the like, meanwhile, equipment universality and maintenance convenience are remarkably improved through the replaceable design of the driving sliding plate, and the device is suitable for mechanical property testing of various hollow cylindrical structural parts.

The invention relates to an intelligent temperature control rock heat-water-force-sound-light multi-field coupling disturbance shearing device and a use method of the intelligent temperature control rock heat-water-force-sound-light multi-field coupling disturbance shearing device. A disturbance shearing mechanism composed of a trapezoid pressing rod, a constant damper and a spring is additionally arranged on the driving side of the lower shearing box. When the tangential loading shaft is propelled at a constant speed, the mechanism can convert stable linear displacement into disturbance shear load of periodic loading and unloading, so that engineering power disturbance is simulated. According to the device and the method, periodic shear disturbance is synchronously applied to a rock sample in a high-temperature seepage environment, mechanical response, seepage characteristic change, internal micro-fracture and surface full-field deformation of the rock sample are comprehensively observed, and an advanced test means is provided for researching a catastrophe mechanism of a deep rock mass under the action of multi-field coupling and dynamic disturbance.

The invention provides a device suitable for a spinning process grid reinforced cylindrical shell structure shaft bending shear loading test, and relates to the technical field of mechanical property test, and the device comprises a portal frame, an axial loading mechanism, a transverse loading mechanism, a first connecting mechanism, a test piece, and a second connecting mechanism; the upper portion and the lower portion of the test piece are fixedly connected with the first connecting mechanism and the second connecting mechanism respectively, the portal frame, the second connecting mechanism and the transverse loading mechanism are fixedly connected to the ground or a trench, the axial loading mechanism is installed on the portal frame, and the first connecting mechanism, the test piece and the second connecting mechanism are located under the axial loading mechanism. The axial loading mechanism is used for being in contact with the upper part of the first connecting mechanism to realize axial loading of the test piece; the transverse loading mechanism is used for making contact with the side face of the first connecting mechanism, and transverse loading of the test piece is achieved. The device can be universally used in a certain size range of a test piece, a transverse load and an axial load do not interfere with each other, and it is guaranteed that the axial bending shear load can be accurately loaded.

The invention discloses a test method for shear creep characteristics of a rock mass structural surface in a near-dam area and a medium. The test method comprises the following steps: collecting corresponding geological exploration data and annual change data of an underground water level after water storage of a dam; designing a test load based on the collected data; designing an artificial sawtooth structural surface based on a rock surface topography instrument; carrying out a rock mass structural surface shear-seepage coupling test, and determining the shear strength of the structural surface under the action of the maximum seepage pressure and the corresponding maximum shear load; carrying out a rock mass structural plane shear creep-seepage coupling test under the dam water storage condition, controlling the shear load to be constant in the test, gradually applying seepage pressure, and recording the creep deformation of the structural plane; a rock mass structural plane shear creep-circulating seepage coupling test is carried out under the dam water storage condition, in the test, the shear load is controlled to be constant, the reciprocating seepage pressure is gradually applied, the structural plane creep deformation is recorded, and the influence of the circulating action of the seepage pressure on the rock mass structural plane shear creep characteristic after dam water storage is simulated.

The application relates to a compression-shear composite loading system based on a pulley system multi-point mean loading, and relates to a compression-shear composite loading system. In order to solve the problem that the traditional compression-shear composite loading is prone to uneven shear flow for a large-size composite stiffened wall plate structure, the application applies uniform compression loads to the side end surface loading end of a test piece through compression actuating cylinders and a flat pressing plate; two shear actuating cylinders output leftward shear loads along the upper end surface of the test piece; and the other two shear actuating cylinders output rightward shear loads along the lower end surface of the test piece; the loads are converted in direction through a pulley assembly and finally act on the shear plates on the upper and lower sides of the test piece. The application realizes the test under different compression-shear ratios by simultaneously adjusting the sizes of the compression and shear actuating cylinder forces, and optimizes the problem of uneven shear loading through the multi-point coordinated loading system, so that the shear of the measuring point is uniform, and the strength test of the large-size stiffened wall plate structure can be better satisfied.

The invention relates to the technical field of low-temperature environment test and ice adhesion test, and discloses a shear ice cutting force measuring device which comprises a low-temperature box, a loading mechanism, a test piece and a control system. The low-temperature box is used for providing a test space and a controllable low-temperature environment; the loading mechanism is used for applying shear load to the test piece and collecting shear force; the test piece is composed of a base and accumulated ice and is installed on the fixing clamp. The control system executes hierarchical temperature control based on a preset parameter table and a PID algorithm, when the temperature difference is large, the refrigeration unit is driven to operate at full power, and when the temperature is close to the set temperature, constant-temperature keeping is achieved through cold and heat power cooperative adjustment; and when a disturbance event is detected, the event-driven parameter table is automatically switched to, and the default parameter table is returned after a recovery condition is met, so that rapid cooling, stable temperature control and disturbance compensation are realized. According to the invention, the shearing debonding force of the ice and the substrate interface can be accurately measured, and the stability and repeatability of an experimental result are enhanced.

The present invention relates to a tripod joint (100) comprising: a joint housing (1), a drive shaft (2) whose drive shaft end (2.1) is arranged in the joint housing (1) and is rotationally fixed to the joint housing (1) via a tripod coupling (3), and a connecting device (4) via which the drive shaft end (2.1) is connected to the joint housing (1), wherein both a shear load and a tensile load can be transmitted between the drive shaft end (2.1) and the joint housing (1) via the connecting device (4), wherein the connecting device (4) comprises a spring element (4.1) which is configured to cushion both a transmitted shear load and a transmitted tensile load, and wherein the spring element (4.1) is a disc spring and has a plurality of spokes (4.1.3).

The application belongs to the field of composite structure layer design of aircraft structure, and particularly relates to a composite laminate layer proportion optimization method, step S1: in the aircraft design process, the design load and the aircraft structure layout are determined, the design allowable value of the composite material applied to the aircraft is determined, including the axial allowable strain epsilon ad , the shear allowable strain gamma ad ; step S2: based on the external load of the aircraft structure and the specific layout, the load characteristic value T of the aircraft to be layered structure is calculated, and the load characteristic value T represents the trend characteristics of the axial load and the shear load of the aircraft to be layered structure; step S3: a plurality of preset proportion composite laminates in a layering library are obtained, and the material characteristic value T m of the composite laminates is calculated; step S4: based on the structure load characteristic value T, the composite laminate with the material characteristic value T m matching the load characteristic value T is selected. The relationship between the structure and the material is quantified, so that the structure material selection is more intuitive and optimal.

This invention discloses a perforated steel connector and a wall connector for post-cast connections in the joint area of ​​modular concrete buildings. The connector is a long strip-shaped metal component, including a web and flanges forming guide surfaces at both ends of the web. The main cross-section adopts a cross-sectional shape where the flanges can be integrally inserted into and accommodated in the slots of a groove-shaped fastener. Through holes are regularly spaced along the length of the web. The groove-shaped fasteners are hung and fixed in pairs to the joint area of ​​the precast concrete module. The flanges at both ends of the steel connector are inserted into the groove-shaped fasteners. Post-cast concrete fills the groove-shaped fasteners and the through holes passing through the steel connectors, forming an integral connection node in the joint area. This invention addresses the shortcomings of the joint area, where the stress performance differs significantly from that of cast-in-place structures, the force transmission path is discontinuous, and interface slippage easily occurs under shear loads.

The present invention discloses a method for analyzing the compression-shear failure of laminates considering the competition between buckling and first-layer failure, comprising the following steps: (1) calculating an initial load based on a load ratio; (2) solving the buckling load of the laminate based on the Rayleigh-Ritz method; (3) predicting the first-layer failure load of the laminate based on a Hashin failure criterion; (4) comparing the buckling load and the first-layer failure load to determine the failure load and failure mode of the laminate; (5) fitting the failure load and failure mode under multiple load ratios to obtain a compression-shear failure curve of the laminate, which is used to judge the failure condition of the laminate under any load ratio. The present invention predicts the buckling load and first-layer failure load of the laminate under different compression-shear loads based on a theoretical method, establishes a method for analyzing the compression-shear failure of laminates considering the competition between buckling and first-layer failure, and further provides a compression-shear failure curve of the laminate, which can significantly improve the efficiency of structural design and reduce the cost of testing.

The application discloses a kind of laminated composite intercalation repair methods, belong to laminated composite maintenance technical field.The application uses the way of multilayer intercalation reinforcement patch, significantly increase the bonding area of patch and original laminated laminated composite material, can effectively improve the bonding strength of repair area, so that repair area will not become laminated laminated composite material / member dangerous area;The bonding surface is composed of multiple planes, and adjacent bonding surfaces bear tensile or shear load respectively, and after debonding or damage of a certain bonding surface, the crack will not spread to other bonding surfaces, significantly enhance the damage tolerance of repair bonding area, and further improve the mechanical properties of repair material / member.

The application provides a cement sheath anti-casing deformation capacity evaluation method and system for oil and gas well cementing, and the evaluation method specifically comprises the following steps: filling the annulus of a mold with cement slurry for cementing after preparation to obtain a sample; applying non-uniform extrusion or shear load to the sample by using a shear test device to simulate the displacement amount of a formation; determining the relative displacement ΔS and the radial size change amount ΔD of the inner cylinder of the mold; determining the deformation amount ΔL of the sample based on the relative displacement ΔS and the radial size change amount ΔD; and judging whether the deformation amount ΔL of the sample is greater than 25 mm, if yes, it is considered that the cement slurry belongs to a large strain cement slurry, and the cement sheath formed has the ability to inhibit casing deformation, otherwise, it is considered that the cement sheath formed by the cement slurry does not have the ability to inhibit casing deformation. The application can quantitatively evaluate the contribution of the cement slurry to reducing the degree of casing deformation, and provides technical support for selecting a cement slurry to reduce casing deformation caused by formation sliding.

This invention belongs to the field of testing technology, specifically relating to a dynamic shear test device and method for a flexible connection assembly of an aircraft fuel system. The test device includes a reciprocating assembly, a clamping assembly, and a loading assembly. A second push block in the reciprocating assembly is connected to a first locking block in the clamping assembly. The loading assembly is located on one side of the clamping assembly. The reciprocating assembly applies a shear load to the flexible connection assembly. The clamping assembly is responsible for clamping and fixing the test tube. The loading assembly injects pressure into the test tube. By connecting two test tubes using the flexible connection assembly, and controlling the pressurization module in the loading assembly to pressurize the test tube and the electric cylinder in the reciprocating assembly to apply thrust to the test tube, the internal working pressure and external shear load of the flexible connection assembly are tested. This provides standard equipment and methods for conducting life testing research on flexible connection assemblies, and also provides a reference for the selection of flexible connection assemblies.

The utility model provides a kind of in-situ detection device of concrete shear strength double-sided direct shear method, including H-shaped column test piece in entity concrete work pit, the H-shaped column test piece is provided with shear direction loading device in axial direction, makes H-shaped column test piece damage along the prescribed two shear surfaces, the H-shaped column test piece is provided with normal loading device embedded in work pit and the normal loading device is surrounded in H-shaped column test piece in vertical direction to the axis.The utility model applies different levels of normal load by normal loading device, obtains normal stress;While using shear direction loading device makes H-shaped column test piece damage along the prescribed two shear surfaces, measures corresponding shear load, obtains shear stress;According to normal stress and shear stress under each level of load, according to relevant standard, obtains shear strength, it is strong in practicality, accurate in detection, and reasonable in design.

The invention discloses a cascade type loading system and method for a curved surface wallboard shear load test. The system comprises a fixed end assembly, a movable end assembly and a cascade system. The cascade system is formed by connecting a plurality of shearing force loading units in series in a hinged mode and is connected between the fixed end assembly and the movable end assembly. A reverse load is applied to a pair of torsion actuators of the movable end assembly to form a torque, the torque is transmitted through a cascade system, and a uniform shear load is generated in the longitudinal direction of a test piece. Through the modular and cascaded design, high-uniformity application of the shear load and effective decoupling of the axial load are achieved.

To stably install a gondola guide frame on a vertical frame, by regulating the action of a shearing load on a fixture for fixing the gondola guide frame to the vertical frame.SOLUTION: A curtain wall unit 2 guides an elevating gondola 20 by a guide part 41. The curtain wall unit 2 includes a vertical frame 6, a gondola guide frame 40 mounted on the vertical frame 6 and provided with a guide part 41, fixtures 60, 61 for fixing the gondola guide frame 40 to the vertical frame 6, and transmission components 70, 80 for transmitting a load from the gondola guide frame 40 to the vertical frame 6 to restrict a shear load from acting on the fixtures 60, 61.SELECTED DRAWING: Figure 4

The application provides a rock mass weak layer original state solution modification test device and method, which comprises a normal load system for applying a normal stress to a weak layer to be tested, a solution modification system for modifying the weak layer to be tested, a shear load system for applying a shear stress to the weak layer to be tested, and an observation system for observing deformation data in a test process; the normal load system is connected with a rock mass above the weak layer to be tested to simulate an in-situ stress state, the solution modification system is arranged around the weak layer to be tested to realize solution wrapping modification, the shear load system is connected with the weak layer to be tested on a side to carry out a shear mechanical test, and the observation system is arranged corresponding to the weak layer to be tested to collect deformation parameters. The application can carry out the weak layer original state solution modification test, and accurately obtains an influence mechanism of the solution modification on mechanical properties of the weak layer through the shear test.

The invention belongs to the technical field of outdoor field in-situ direct shear tests, and discloses in-situ direct shear test equipment, a test system and a use method, the equipment comprises a base, and a shear clamp is arranged at the top of a fixed clamp; through holes are formed in four corners of the fixing clamp and the shearing clamp; a clamp sliding groove is formed in the bottom face of the shearing clamp. A clamp rolling ball is arranged in the clamp sliding groove. A first pressing plate is arranged at the top of the shearing clamp, a second pressing plate is arranged at the top of the first pressing plate, and a pressure plate sliding groove is formed in the bottom of the second pressing plate; a pressure plate rolling ball is arranged in the pressure plate sliding groove. Supporting frames are arranged on the base on the outer sides of four corners of the fixing clamp; a vertical load simulation loading mechanism is arranged at the top of the support frame; a shearing force load simulation loading mechanism is arranged on a supporting body on the right side of the fixing clamp and the shearing clamp. The device is small in occupied space, convenient to carry and transfer and capable of adapting to field direct shearing in various geological environments.

The invention relates to a load transfer analysis method, system, equipment and medium based on a CFSC structure of a steel-concrete combined section, and the method comprises the steps: building a unit mechanical model of the CFSC structure based on equivalent spring assumption, proposing a first balance equation of the unit mechanical model, setting a node interval for the unit mechanical model, and setting a second balance equation for the unit mechanical model; deducing the first balance equation based on the node interval to obtain a first load transfer expression of the unit mechanical model; deducing the first load transfer expression based on interface bonding force analysis, interface relative slip analysis, interface friction force analysis, shear load analysis and difference estimation analysis to obtain a second load transfer expression; a combined mechanical model of the steel-concrete joint structure is constructed, the steel-concrete joint structure comprises a plurality of CFSC structure units, a second balance equation of the combined mechanical model is proposed based on the strain plane section assumption, the second balance equation is deduced based on the variable matrix, and a third load transfer expression of the combined mechanical model is obtained.

The invention relates to the technical field of geotechnical engineering test equipment, and provides a soil-lining interface constant pressure difference seepage-shear coupling performance test device and method.The device comprises a main controller, a sensor array used for monitoring the stress field distribution state, a data acquisition system, a shear box and a confining pressure box internally provided with a confining pressure cavity; the shear box is located in the confining pressure cavity, the bottom of the shear box is in sliding connection with the confining pressure box, shear loading devices are arranged on the top and the two opposite side faces of the shear box respectively, permeable stones are arranged on the inner top wall and the inner bottom wall of the shear box respectively, and the top and the bottom of one side of the shear box are connected with a water supply pipeline and a water drainage pipeline respectively. The communicating ends of the water supply and drainage pipelines and the shear box are respectively positioned on the opposite sides of the two permeable stones. According to the invention, independent loading and stable maintenance of normal pressure, interface shear force and constant seepage pressure difference across the interface direction are realized, and the problems that the functions of the existing test equipment are separated and constant pressure difference seepage and shear load coupling performance test cannot be realized are solved.

The invention discloses a test fixture for I-type crack propagation between laminboard surfaces and cores, and belongs to the technical field of test equipment. The clamp comprises a loading part, a clamping part and a slidable part, the loading part is composed of a loading block, a pin shaft, a bonding block and a force sensor, the clamping part comprises a clamping block, a bolt and a U-shaped base, and the slidable part comprises a sliding block, a guide rail and a T-shaped base. The loading block is rotatably connected with the bonding block through a pin shaft, the bonding block is bonded on a panel of the sandwich panel to pull the panel to open, the clamping block is matched with the U-shaped base through a bolt to fix the sandwich panel, the U-shaped base is fixed on the sliding block, the sliding block can slide along the guide rail, the guide rail is fixedly connected with the T-shaped base, and the T-shaped base is used for being connected with a chuck of a load testing machine. According to the invention, the transverse shear load can be detected and eliminated through the force sensor, the additional bending moment generated at the loading end is avoided, the crack form is ensured to be a pure I-type crack, and a reliable experimental basis is provided for sandwich panel core failure mechanism research and fracture toughness evaluation.

The invention relates to a method for testing the shear loading rigidity of calibration equipment, which comprises the following steps of: calculating the first shear loading rigidity of the equipment under different cylindrical steel sample loading test conditions by adopting a direct test method; calculating the second shear loading rigidity of the equipment under a rock simulation fault friction test condition by adopting an indirect test method; at the initial stage and the final stage of loading, comparing the first shear loading rigidity of the equipment with the second shear loading rigidity of the equipment in the same tangential force range, and judging whether the second shear loading rigidity of the equipment is a final calibration value of the shear loading rigidity of the equipment or not; if yes, taking the second shear loading rigidity of the equipment as a final calibration value; otherwise, indirect testing is carried out again. A direct test method is introduced as a reference standard, and the shear loading rigidity obtained by an indirect test method under a real friction sliding working condition is verified, so that reliable calibration of the shear loading rigidity of test equipment is realized.

The application discloses a repairing method for shear web offset in a fan blade, which comprises the following steps: cutting the part of the main beam beam head connected with the shear web to be repaired from the shear web to be repaired; preparing a prefabricated shear web same as the shear web to be repaired according to the cut shear web to be repaired; installing the prefabricated shear web on the main beam beam head corresponding to the shear web to be repaired; and finally, completing the repairing of the shear web offset in the fan blade by overlapping the part of the shear web to be repaired which is not cut with the prefabricated shear web. The prefabricated shear web can support the upper and lower main beam beam heads and bear the shear load of the fan blade by overlapping the part of the shear web to be repaired which is not cut with the prefabricated shear web after the prefabricated shear web is installed on the main beam beam head corresponding to the shear web to be repaired, and the stability of the fan blade and the shear web to be repaired is provided.

This invention discloses a method for calculating the critical preload margin of bolts under external loads. The method includes establishing a finite element model of an assembly connected by bolts and setting contact relationships and constraints; applying an external load to the finite element model and solving it to obtain the bolt working load; extracting the force values ​​in the x, y, and z directions at the contact position between the bolt head and the clamping element from the bolt working load; and calculating the shear load and axial load of the bolt working load using these force values; and calculating the critical preload margin required to ensure the clamping element does not separate using the shear load and axial load. This invention, through the contact settings used in finite element analysis, can obtain the actual working load borne by the bolt according to different external loads, and then evaluate the minimum bolt preload force required to prevent the clamping element from separating, i.e., the critical preload margin. This critical preload margin can then be used to guide bolt selection, safety assessment, and product optimization design.

This invention belongs to the field of electrical equipment technology and discloses a method for calculating the dynamic response of dry bushings under seismic loading and establishing a core crack damage model. After simulating the vibration response of transformer bushings under seismic conditions, this invention can obtain various important data, including acceleration response, displacement response, actual stress, deformation degree, and stress concentration. This allows for the adjustment and optimization of various structural and material parameters. Through this simulation, the various physical effects in 110kV resin-impregnated paper dry bushings can be predicted, and the service life of the material in actual scenarios can be accurately determined. This invention establishes two fracture phase-field models to simulate crack propagation in thin plates under different loading conditions. By establishing a phase-field model for isotropic plate fracture problems, numerical calculations are performed using finite element analysis software to study the crack propagation process of thin plates with initial cracks under tensile and shear loads, and the influence of various parameters on crack propagation is calculated.

This application relates to a two-stage energy-dissipating spring-loaded metal damper, comprising at least one first-stage steel plate deformation energy-dissipating component and at least one second-stage steel plate deformation energy-dissipating component. The components are arranged side-by-side and integrated into a single module with a detachable cover and base. The upper and lower ends of the energy-dissipating steel plate of the first-stage component are fixedly connected to a first connecting unit and a second connecting unit, respectively. The lower end of the energy-dissipating steel plate of the second-stage component is fixedly connected to the second connecting unit, and the upper end is connected to the first connecting unit via the spring-loaded energy-dissipating component. The spring-loaded energy-dissipating component includes a limiting plate, a limiting groove, a movable bolt, a spring, and a locking plate formed on the first connecting unit. The movable bolt passes longitudinally through all the limiting grooves in the same second-stage component, and the spring clamps it in the middle of the limiting groove. When the displacement reaches a preset threshold, the movable bolt deflects and passes over the locking plate. The spring rebounds, causing the locking plate to enter the limiting groove and lock the bolt at its end. The bolt makes close contact with the wall of the limiting groove, transmitting shear load and achieving second-stage energy dissipation. This invention features clear stages, reliable triggering, firm locking, and easy disassembly and maintenance.