21 results about "Stress strength" patented technology

The invention discloses a cargo floor structural strength design optimization method and system based on load prediction, and belongs to the technical field of freight vehicle structural design. The maximum equivalent stress of each node in a floor grid area is calculated and normalized by constructing a load prediction model of the dynamic distribution state of cargoes in a cargo tank; forming a stress intensity coefficient matrix; identifying a high-risk area and constructing a reinforced target area set; obtaining an initial parameter of the bottom plate structure, establishing a finite element model, and setting an adjustable structure parameter in the target area; a candidate structure design scheme set is generated, simulation calculation is executed, the total structure mass, the maximum stress value and the first-order inherent frequency of each scheme are extracted, and a performance evaluation vector is formed; selecting an optimal design scheme through a multi-objective optimization algorithm, and outputting structural parameters of the optimal design scheme as a final design result; according to the method, the structural optimization design of the cargo tank bottom plate under the complex load working condition is achieved, and the method has high engineering adaptability and practical value.

The utility model discloses an anti-rotation internal thread pin for a server sliding rail. The anti-rotation internal thread pin comprises a mounting plate, a fixing plate is arranged at the front end of the mounting plate, special-shaped holes are formed in the two sides of the interior of the fixing plate, a reinforcing cylinder is arranged in the fixing plate, a lock nut is arranged on the surface of the reinforcing cylinder, and an internal thread hole is formed in the reinforcing cylinder. According to the anti-rotation internal thread pin for the server sliding rail, through the design that threads are arranged in the reinforcing barrel and on the surface of the reinforcing barrel, a nut at the tail end of the reinforcing barrel is matched with an anti-loosening nut to clamp a fixing plate, then a bolt is fixed to a base or a supporting structure through an internal thread hole, and the bolt is matched with a captive screw through the internal thread hole; the device can be connected with a server case hanging lug on the pin at any position of the upper, middle and lower parts of the front end of the corresponding sliding rail, meanwhile, the stress strength of the bolt is further increased, and the problems that the stress is too large and the bolt is broken and damaged due to the fact that the weight of the server is large and the gravity is concentrated on the bolt are solved.

The present invention discloses a reliability analysis method for a ball screw pair based on a stress-strength model and interference theory, comprising: calculating the mean and standard deviation of each key process parameter of the ball screw pair according to design requirements and processing technical conditions; solving the mean and standard deviation of the rated dynamic load and equivalent dynamic load respectively according to the Taylor series expansion; calculating the reliability index, setting the calculation step size and calculation accuracy, and calculating the probability of the random variable falling into the total failure area. When the accuracy requirements are met, the failure probability of the stress-strength interference model is solved. The reliability of the ball screw pair calculated by the present invention takes into account the uncertainty of the design and processing of the process parameters of the ball screw pair and the random uncertainty of the load, calculates the distribution range of the rated dynamic load and equivalent dynamic load of the ball screw pair, and then calculates the failure probability of the interference area. Based on the interference area of ​​the rated dynamic load and the equivalent dynamic load, a new reliability calculation method for the ball screw pair is provided, which is of great significance for improving the performance and increasing the reliability of the ball screw pair.

The utility model provides a mute rotary drilling machine drill bit soil unloading oil cylinder fixing base which comprises base assemblies symmetrically installed on a rotary drilling machine power head and a connecting body welded to a cylinder body, and the connecting body is rotationally connected between the two base assemblies. The base assembly comprises a first base body and a second base body which are fixed to a power head of the rotary drilling machine, the first base body and the second base body are connected through a plurality of first bolts, a transversely-through reinforcing groove is formed in the side, facing the second base body, of the first base body, a reinforcing block matched with the reinforcing groove is arranged on the second base body, and a rotating hole is formed in the second base body in a penetrating mode. By means of the structure, the longitudinal supporting strength of the first base body to the second base body can be improved under the cooperation of the reinforcing groove in the first base body of the base assembly and the reinforcing block of the second base body, and therefore the situation that the first bolt is cut off due to the fact that longitudinal thrust acts on the first bolt can be prevented; therefore, the stress strength of the base assembly is improved, the stress performance is improved, and the service life is prolonged.

The invention provides a conical wind power mixed tower health monitoring system and method, and relates to the technical field of sensing structure detection.The conical wind power mixed tower health monitoring method comprises the steps that a three-dimensional geometric model is constructed and subjected to grid division, stress intensity evaluation is conducted on a tower body based on finite element analysis, and the weak cross section in the middle of the tower body is determined; stress intensity calculation is conducted on the weak cross section to obtain a health index, then the displacement condition of the top of the tower body and the base area is analyzed, the maximum displacement point and the minimum displacement point are determined, a line segment is formed through the maximum displacement point and the minimum displacement point, a displacement extension angle is calculated, and therefore the relative transverse displacement of the tower body is evaluated. And finally, setting a cross section stress intensity threshold value and a tower body relative transverse displacement threshold value, and when a monitoring value exceeds the threshold value, giving out fault early warning and adjusting a blade angle so as to reduce mechanical loss.

The utility model relates to an anchor windlass comprising a novel base, the anchor windlass comprises an anchor windlass body and the novel base, the novel base comprises a supporting vertical plate and a main stress plate which are perpendicular to each other, the main stress plate is provided with a matching hole, and the novel base is installed at the bottom end of the anchor windlass body through the matching hole. Compared with the prior art, the whole structure of the novel base provided by the utility model is simpler than that of the conventional base, and each novel base only consists of two steel plates, so that the material consumption is greatly reduced, and the manufacturing cost is greatly reduced; while material use and cost are reduced, good stability and high fatigue resistance and tensile stress strength are still kept, and the technical economy is good.

This utility model relates to the field of utility pole reinforcement and discloses a reinforcement device for utility poles, comprising: multiple sets of reinforcement components, each set of reinforcement components including at least a first clamp component, a second clamp component, and two support arms. The first clamp component is fixedly connected to the upper part of the cement pole to be reinforced, and the second clamp component is fixedly connected to the lower part of the cement pole to be reinforced. The two support arms are symmetrically arranged, with their ends fixedly connected to the first clamp component and the second clamp component, respectively. The multiple sets of reinforcement components are staggered along the axial direction of the cement pole, and the multiple support arms are staggered along the radial direction of the cement pole. The reinforcement device provided by this utility model, by staggering the multiple sets of reinforcement components along the axial direction of the pole and cooperating with the multiple support arms staggered along the radial direction of the pole, forms a "three-dimensional mesh" force-bearing structure, improving the stress strength and distributing external forces to multiple points on the upper and lower sections of the pole, avoiding fracture at the joint due to local stress overload.

The utility model discloses a high-strength thrust rod, which belongs to the technical field of automobile accessories and comprises an I-shaped rod body and core seats arranged at two ends of the I-shaped rod body, the I-shaped rod body comprises a weight reduction groove, a plurality of reinforcing ribs are arranged in the weight reduction groove, two ends of each reinforcing rib are respectively connected with two side walls of the weight reduction groove, the reinforcing ribs are horizontally perpendicular to the side walls of the weight reduction groove, and the core seats are arranged on the core seats. Side reinforcing arc edges are arranged between the edges of the reinforcing ribs and the side walls of the weight reduction grooves, the reinforcing ribs enable the strength of the rod body to be improved, the reinforcing ribs are arranged to be perpendicular to the rod body, so that the lateral stress strength of the rod body is improved, the side reinforcing arc edges are arranged on the two sides of the reinforcing ribs, the stress direction between the reinforcing ribs and the rod body is dispersed, and the stress strength of the rod body is improved. According to the I-shaped thrust rod, the stress concentration phenomenon is reduced, so that the strength of the rod body is further improved, the strength of the I-shaped thrust rod is effectively improved, the machining cost and the machining efficiency of the thrust rod are guaranteed, and meanwhile the thrust rod has the strength capable of adapting to more extreme environments.

The invention discloses a method and a device for evaluating safety of a pipe column of an electric submersible screw pump lifting system. The method comprises the following steps: constructing a well depth track and a well curvature model according to well bore data and well track data; according to the well depth track and the borehole curvature model, the stress of a tubular column of the electric submersible screw pump lifting system under different working conditions is analyzed and determined in combination with the stress of the electric submersible screw pump unit; the working conditions comprise well lifting, pump lowering and unit operation processes; establishing a tubular column stress model of the electric submersible screw pump lifting system according to the stress of the tubular column of the electric submersible screw pump lifting system under different working conditions; determining the maximum stress intensity on the cross section of the tubular column based on the tubular column stress model of the electric submersible screw pump lifting system; and according to the maximum stress strength on the cross section of the tubular column, determining the strength safety coefficient of the tubular column by using a tubular column strength safety coefficient formula.

The application provides a design method of a special fixture for positioning energy storage spot welding based on a guide vane assembly, comprising the following steps: determining an energy storage spot welding process route, first spot welding a baffle plate 1 and a baffle plate 2, then spot welding a honeycomb, and then spot welding and combining with a main part. Determining a part positioning reference, and selecting an outer circle of the part as a positioning reference surface. Selecting a spot pole base material, and selecting brass or red copper as the spot pole base material. Designing a detachable spot pole base, preferentially assembling the baffle plate 1 and the baffle plate 2 during spot welding, forming a baffle plate assembly, and increasing the welding points and the welding strength to form a honeycomb assembly. The application has the following advantages: the part size precision is ensured, the stability and the inclusiveness are considered at the same time, and the spot welding efficiency is improved. The fitting degree between the honeycomb and the baffle plate is improved through the adaptive curvature, the stress strength of the part during the energy storage spot welding is increased, the combination between the parts is strengthened, the deformation of the baffle plate and the honeycomb is reduced, and the vacuum brazing quality of the part is improved.

The present application relates to the technical field of highway, railway, municipal bridge high pier construction, especially to a high pier bearing pre-buried hole pre-buried part and pre-buried method. The present application comprises the following construction steps: designing the installation position of the pier column pre-buried hole pre-buried part for guiding the on-site construction, pouring forming operation, including binding reinforcement, formwork installation, pouring concrete, vibrating and compacting, and product maintenance, carrying out special design on the reinforcement avoidance of the pre-buried hole position, installing the pre-buried part on the positioning and locking device, and then locking the pre-buried part by using the positioning and locking device. The information construction is convenient for construction scheme design and construction guidance, simplifies the preparation work in the early stage of construction, and solves the problem that the upper and lower spacing of the design horizontal stirrup is less than the height of the pre-buried part in the avoidance treatment of binding reinforcement in the pouring construction, so that the overall stress strength and actual strength of the reinforcement at the reserved hole position meet the requirements, the positioning and locking device can improve the construction precision, reduce the displacement of the pre-buried part during pouring, and improve the construction quality.

The utility model relates to the technical field of tunnel construction, and discloses a modularized subway underground excavation construction steel arch structure which comprises a plurality of arch units which are detachably connected, every two adjacent arch units are connected through a connecting structure, and a prestress tensioning adjusting assembly is fixedly arranged at the position of each connecting structure. The prestress tensioning adjusting assembly is used for applying prestress to the connecting structure and adjusting the bending radian, the prefabricated arch frame units are quickly assembled through the connecting plates and the bolts to form a primary steel arch frame structure, then prestress is applied to the connecting position through the prestress tensioning adjusting assembly, and the steel arch frame structure is formed. The steel arch frame has the advantages of being simple in structure, capable of improving the compression resistance of the connecting position, ensuring that the steel arch frame has enough stress strength, and finally finely adjusting the bending radian of the arch frame by adjusting the tensioning force according to construction requirements to ensure the integrity and continuity of the structure.

The high-stability foundation bolt comprises a foundation bolt body, a bottom plate is fixedly installed at the bottom end of the foundation bolt body, an inclined vertebral plate is installed on the upper surface of the bottom plate in an attached and welded mode, and a set of supporting plates is fixedly installed in the middle of each side of the upper surface of the inclined vertebral plate. A conical disc is fixedly welded to the position, located at the top ends of the supporting plates, of the exterior of the foundation bolt body, and a positioning plate is welded to the position, located on the upper side of the conical disc, of the exterior of the foundation bolt body. The overall stress area of the foundation bolt body is increased through the inclined vertebral plate fixedly installed on the upper surface of the bottom plate, the stability of the foundation bolt body in the using process is guaranteed, meanwhile, the supporting plate installed on the upper surface of the inclined vertebral plate is used for reinforcing and connecting the inclined vertebral plate and the conical disc, and meanwhile the using strength of the bottom of the foundation bolt body can be improved; and the stress plate installed on the upper surface of the conical disc can further improve the stress strength of the foundation bolt body when the foundation bolt body is buried in soil for use.

The utility model belongs to the technical field of pipe fitting machining, and provides a punch structure of a stainless steel pipe fitting high-pressure forming die, the punch structure comprises a body, a needle head, a pin and a spring, a supporting part is arranged at the top of the body, and a movable groove is formed in the supporting part in the radial direction of the supporting part; the needle head is arranged on the supporting part in a sleeving manner, a positioning groove corresponding to the movable groove is formed in the needle head, and a top hole communicated with the positioning groove is formed in the needle head; the pin is inserted into the movable groove and is provided with a top cap; the pin is sleeved with the spring, one end of the spring abuts against the inner wall of the movable groove, and the other end of the spring abuts against a top cap of the pin. The connecting structure can be quickly assembled and disassembled, subsequent maintenance and replacement are facilitated, the stress strength is improved, and shoulder collapse is avoided.

The utility model relates to the field of fastening connecting pieces, in particular to an anti-skidding hoop device which comprises two hoop clamping pieces, a reinforcing assembly and an adjustable anti-skidding assembly, pressing rod holes are formed in the two sides of the two hoop clamping pieces, two opposite-pulling screw rods are horizontally and jointly inserted between the pressing rod holes of the two hoop clamping pieces, and the reinforcing assembly and the adjustable anti-skidding assembly are arranged on the two opposite-pulling screw rods. The reinforcing assembly is arranged on the opposite sides of the two hoop clamping pieces, the reinforcing assembly comprises two reinforcing side ribs, the reinforcing side ribs capable of improving the clamping stress strength of the hoop clamping pieces are arranged on the opposite sides of the two hoop clamping pieces correspondingly, when the hoop clamping pieces are in contact connection with the engineering pipe fitting, larger butt clamping pressure can be applied, the anti-skid performance of the contact face is improved, and the anti-skid performance of the engineering pipe fitting is improved. And then the adjustable anti-skid assembly is arranged on one side of the combined groove of the hoop clamping piece, the anti-skid effect of the contact surface is improved through position adjustment and deformation of the abutting anti-skid plate between the connecting positions of the hoop clamping piece and the engineering pipe fitting, meanwhile, adaptability is higher, and use is stable and convenient.

The invention provides a safety early warning method and device for a main beam of a bridge crane, and belongs to the field of mechanical engineering. The method comprises the following steps: acquiring index data of a plurality of crane samples of the same type; for each item of index data, determining an entropy value corresponding to the index data according to the dispersion degree of all sample index data; calculating the objective weight of each piece of index data according to the proportion of the entropy of each piece of index data to the entropy of the overall index data; performing weighted summation on the multiple index data of the crane to be evaluated according to the objective weight to obtain an early warning index, and performing graded early warning according to the early warning index; the state indexes comprise a stress intensity index, a rigidity index, a crack state index, a corrosion depth index and a maintenance state index. According to the method, a comprehensive evaluation system covering five dimensions including strength, rigidity, cracks, corrosion and maintenance is constructed through a multi-dimensional index system and a weighted fusion model, so that the one-sidedness of single parameter evaluation is overcome, and safety early warning is more reliable.

The invention provides a welding structure surface fatigue crack propagation life evaluation method and system, and relates to the technical field of crack life evaluation and prediction.The method comprises the steps that generalized structural stress in a tensile load mode and generalized structural stress in a bending load mode are calculated through numerical simulation; a welding seam gauge is used for actually measuring the geometrical characteristics of the welding joint, and geometrical characteristic parameters of the welding joint are extracted; generating a tensile load geometric correction factor and a bending load geometric correction factor associated with the crack characteristic parameters through multivariate nonlinear regression analysis; constructing a stress intensity amplification factor correction model in a shallow surface crack stage, and further generating a full-thickness stress intensity amplification factor in the shallow crack stage; and iteratively calculating the evolution of the crack depth, and outputting a fatigue life prediction result of the welding joint. According to the method, the stress intensity factor of the crack on the surface of the welded joint is accurately solved, and the efficiency of crack propagation life evaluation is improved.

The utility model discloses a steel structure frame node connecting device, which relates to the technical field of steel structures and comprises a bottom plate, and the bottom plate is mounted on steel structure frame columns through mounting holes and bolts arranged at four corners of the bottom plate. The connecting piece is arranged in the middle of the outer side of the bottom plate; the reinforcing pieces are arranged at the upper end and the lower end of the joint of the connecting piece and the bottom plate; and the extension plates are mounted in the middles of the two sides of the connecting piece. According to the steel structure frame node connecting device, the bottom plate and the connecting piece are tightly connected through the inserting connection of the inserting blocks and the inserting grooves and the fixing mode of the attaching plates and the bolts, meanwhile, the reinforcing piece is made of angle steel and is provided with the reinforcing blocks and the reinforcing ribs to form a triangular stable structure, and the mounting strength and the stress strength of the connecting piece are effectively improved; compared with the connection mode that only a screw rod is matched with a sliding block in the prior art, the requirement for large stress of a steel frame connection joint can be better met, and safety and stability of the structure are guaranteed.

The utility model discloses a basement bottom plate post-cast strip structure, relates to the technical field of post-cast strips, and solves the problems that concrete in a post-cast strip can generate certain pressure stress on basement bottom plates on the two sides of the post-cast strip, and when the pressure stress intensity of the part is large, the basement bottom plates can crack and even be broken. Comprising a post-cast strip and basement bottom plates arranged on the two sides of the post-cast strip, a thickened cushion layer is arranged at the bottom of the post-cast strip, and a rubber waterstop is arranged in the post-cast strip and located above the thickened cushion layer; when the pressure reducing device is used, the steel plate on the pressure reducing assembly has high strength and hardness and is not prone to deformation, so that the basement bottom plate is restrained through the steel plate, the direct contact area of the post-cast strip and the basement bottom plate is reduced, the pressure stress of the post-cast strip acting on the basement bottom plate is reduced, and the service life of the basement bottom plate is prolonged. And the possibility of cracks caused by overlarge stress on the basement bottom plate and the post-cast strip is reduced.

The present application belongs to the technical field of structure design, and discloses a torsional spring analysis and optimization method and system. According to torsional spring parameters including torsional spring diameter, torsional spring medium diameter, torsional spring effective number of turns, free angle, material elastic modulus, initial working torsion angle, limit working torsion angle and force arm length, the analysis result of the torsional spring is calculated, wherein the analysis result includes initial working torque, initial bending stress, limit working torque, maximum bending stress, static load allowable stress and strength residual coefficient. The present application encapsulates the complicated calculation process of different types of torsional spring analysis through programming to generate an analysis and optimization tool. By simple selection and input, the torsional spring analysis result can be quickly obtained by one key, and whether the torsional spring meets the strength requirement is checked. The present application is simple and direct, and according to the analysis result, the torsional spring is quickly iteratively optimized according to the situation, the design is guided, the calculation and analysis errors of structure research and development designers are avoided, repeated calculation is avoided, the workload is reduced, and the work efficiency is improved.

The present application relates to the technical field of hydraulic system, provide a kind of hydraulic pipeline fatigue relieving method, device and hydraulic pipeline system, the method introduces the corresponding relationship between the different rotational speed of predetermined variable frequency pump, the different opening number of side branch pipe and the pipeline pressure at the outlet of pipe joint connected by the driving equipment of hydraulic pipeline system, filter out the combination satisfying minimum pressure demand, can quickly meet the pressure regulation demand of hydraulic pipeline system. By obtaining the normal stress intensity of main pipeline under each combination configuration, and selecting the target combination with the minimum normal stress intensity of main pipeline from it to configure the hydraulic pipeline system, the main pipeline can be guaranteed to have the minimum normal stress intensity, effectively relieving the fatigue fracture problem caused by excessive normal stress of main pipeline.