38 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 a high-altitude large-span cantilever beam construction structure. The wall comprises a wall body, splicing holes are formed in the outer wall of the wall body, a steel reinforcement framework is bound to the top of the wall body, a bottom plate is inserted into the splicing holes, fixing holes are formed in the outer wall of the bottom plate, a top plate is placed on the top of the steel reinforcement framework, and a fixing structure is fixedly connected between the bottom plate and the top plate. The fixing structure comprises a connecting column inserted into the fixing hole. One end of the bottom plate is inserted into the wall, the top plate on the top of the steel reinforcement framework is fixedly connected with the bottom plate through the connecting columns and the nuts, the first side plate and the second side plate on the two sides are fixed through the fixing structures, a firm pouring space can be formed, pressure is borne through the connecting columns in a multi-point mode, and construction is convenient. The stress strength of the whole structure is improved, the probability of concrete leakage caused by expansion of splicing seams can be reduced, concrete leakage is avoided, the construction cost is reduced, and the attractiveness and quality of the solidified concrete are guaranteed.

The invention discloses a short manual and automatic integrated double-insurance structure connector, relates to the technical field of engineering equipment, and is used for solving the problems of too large axle distance and too long total length of an existing connector and reducing negative effects caused by too long length. The front end of the shell is a planar front end side wall arranged in the vertical direction, a hanging groove and a hanging hook are designed on the left side and the right side of the top of the front end respectively, the movable upper end is rotationally connected with the shell through a first shaft, the tail of a cylinder barrel of the air cylinder is rotationally connected with the shell, and the front end of a piston rod of the air cylinder is rotationally connected with the middle of the movable hook. Therefore, according to the connector, the overall length of the connector is shortened, compared with the prior art, the axle distance is smaller, the occupied space is small, the stress strength is not affected, the problems that an existing connector is too large in axle distance and too long in total length are solved, and the negative effects that digging force is reduced and soil is prone to adhering due to the fact that the length is too long are reduced.

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 invention belongs to the field of helicopter structure fatigue design, and relates to a static test-free evaluation method for a helicopter composite material rigid blade root. The method comprises the steps that on the basis of blade root flapping bending moment and shimmy bending moment load original spectrums, the equivalent load of the flapping bending moment and the equivalent load of the shimmy bending moment under the rotor first-order passing frequency are obtained through the damage equivalence principle, and the ratio of the equivalent load of the flapping bending moment and the equivalent load of the shimmy bending moment serves as the blade root fatigue test load ratio; determining a blade root flapping bending moment fatigue test load and a shimmy bending moment fatigue test load according to the target life sum as a blade root fatigue test load ratio, and performing a blade root fatigue test; determining the structural stress strength limit # imgabs0 # of the roots of the paddles according to fatigue test results of the roots of the multiple paddles, and comparing the # imgabs1 # with a pre-calculated limit strength value # imgabs2 #; and if the # imgabs3 # is detected, the static test is not carried out.

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 invention discloses a maximum horizontal ground stress prediction method based on well wall caving geometry in any shape, and relates to the technical field of well drilling and completion, and the method comprises the steps: constructing a well wall caving geometric model based on well wall logging data; according to the well wall caving geometric model and the rock mechanics experiment data, a well wall strength mechanical model considering the scale effect is established, and the well wall caving rock cohesion strength is obtained; establishing a semi-analytical well periphery coupling temperature-seepage-stress calculation mechanical model by utilizing a well wall caving geometric model to obtain a total stress field; the total stress field comprises an elastic stress field, a pore elastic stress field and a thermal elastic stress field; establishing a well wall caving stable stress intensity criterion; according to the well wall caving geometric model, the well wall caving rock cohesion strength and the total stress field, the well wall caving stable stress strength criterion is used, an inversion model is established, the magnitude and direction of the maximum horizontal ground stress are predicted, and the maximum horizontal ground stress prediction efficiency and accuracy are remarkably improved.

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 utility model discloses high-strength welding H-shaped steel which comprises a web plate, wing plates are arranged at the top and the bottom of the web plate, high-strength pressure-resistant protruding plates are fixedly connected to the top and the bottom of the web plate, and sliding grooves used in cooperation with the high-strength pressure-resistant protruding plates are formed in the middles of the wing plates. According to the high-strength welded H-shaped steel, the high-strength pressure-resistant convex plates fixedly connected with the top and the bottom of the web are slidably inserted into the clamping sliding grooves formed in the surfaces of the wing plates, the pressure-resistant stable bolts are inserted into the clamping holes of the high-strength pressure-resistant convex plates from the welding groove holes of the wing plates at intervals in a matched mode, and the high-strength pressure-resistant convex plates are fixed; then the stress strength is increased through reinforcing rib plates arranged on the two sides of the contact face of the web and the wing plates, and the welding plates and the wing plates are fixedly welded through longitudinal full welding of the longitudinal welding blocks, so that the wing plates at the top and the bottom are connected with the web more stably; and the anti-torque strength and the stress load stability of the H-shaped steel in actual use are greatly improved.

The invention is applicable to the technical field of tensioning wheel devices, and provides a tensioning wheel device with a surface composite texture, which comprises a tensioning wheel main body, the tensioning wheel main body is provided with a surface in contact with the belt back of a poly V-belt, and the surface is provided with the composite texture. The composite texture comprises a composite texture formed by combining a crossed texture, a multi-arc texture and a round pit texture. Through the design of the composite texture on the surface of the tensioning wheel, full attachment between the tensioning wheel and the poly V-belt back is achieved, and the relative sliding phenomenon is effectively restrained; meanwhile, the stress distribution and the stress intensity of the contact surface are improved, and the vibration and noise level of the friction surface is remarkably reduced; abrasion caused by insufficient friction force is avoided, and the reliability and stability of a transmission system are ensured; and the transmission efficiency is improved, and the service life of the tensioning wheel is prolonged, so that the maintenance cost of equipment and the frequency of replacing the tensioning wheel are obviously reduced.

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 invention is applicable to the technical field of tensioning pulley devices, and provides a tensioning pulley device with a surface composite texture, comprising a tensioning pulley body, wherein the tensioning pulley body has a surface that contacts the back of a multi-V belt, and the surface has a composite texture, wherein the composite texture includes a composite texture composed of a cross-grain texture, a multi-arc texture, and a circular pit texture. The present invention achieves a full fit between the tensioning pulley and the back of the multi-V belt through the composite texture design on the tensioning pulley surface, effectively suppressing the occurrence of relative sliding; at the same time, it improves the stress distribution and stress intensity of the contact surface, significantly reducing the vibration and noise level of the friction surface; avoids wear caused by insufficient friction, and ensures the reliability and stability of the transmission system; improves transmission efficiency and extends the service life of the tensioning pulley, thereby significantly reducing the maintenance cost of the equipment and the frequency of tensioning pulley replacement.

The utility model discloses a compression-resistant high-strength light aluminum profile, and relates to the technical field of aluminum profiles. The plate comprises two plate bodies which are arranged up and down; notches penetrating front and back are formed in the upper and lower opposite end faces of the two plate bodies correspondingly, frames are fixed in the notches correspondingly, honeycomb plate pieces are fixed in the frames correspondingly, and strip-shaped blocks are fixed to the left and right portions of the opposite end faces of the two plate bodies correspondingly. Strip-shaped openings penetrating front and back are formed in the middle positions of the opposite end faces of the two strip-shaped blocks consistent in the left-right direction, compression-resistant elastic pieces are arranged on the left portion and the right portion between the two plate bodies, and inserting strips inserted into the strip-shaped openings in a sliding mode are fixed to the two ends of the compression-resistant elastic pieces. The frame is installed on the opposite end faces of the two plate bodies, so that the stress strength of the plate bodies is improved, meanwhile, the compression-resistant elastic pieces are installed between the two plate bodies, and the compression resistance of the plate bodies can be 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 discloses a front artificial leg for a lightweight helicopter maintenance platform, and particularly relates to the technical field of helicopters, the front artificial leg comprises a support cylinder, a shaft bracket is welded on one side of the support cylinder, a shaft rod is rotatably mounted in the shaft bracket, a push-pull rod is hinged on one side of the top end of the support cylinder, and a rotating shaft is mounted at the bottom end of the support cylinder. The bottom end of the rotating shaft is sleeved with a fixing plate, the bottom end of the fixing plate is connected with a wheel frame, rolling wheels are installed at the bottom of the wheel frame, the bottom end of the rotating shaft penetrates through the fixing plate and is fixedly connected with the wheel frame, connecting plates are symmetrically installed on the fixing plate, and one end of the shaft rod is connected to the bottom of the maintenance platform in a bolted mode. The front artificial leg has the advantages that the whole structure is simple, the whole weight is light, an airplane can be supported and moved more conveniently in the maintenance process, meanwhile, the whole connection is firm, stress sharing can be carried out among a plurality of components, and therefore the stress strength of the front artificial leg is improved, and the service life is prolonged.

The invention provides a heating and cooling integrated plate body welding method which comprises the following steps: (1) after a heating wire is arranged in a groove of a hot plate bottom plate, a hot plate cover plate is welded, and a finished hot plate is obtained; after a cooling pipe is arranged in a groove of the cooling disc bottom plate, a cooling disc cover plate is welded, and a finished product cooling disc is obtained; and (2) vacuum brazing is conducted on the finished hot plate and the finished cold plate at the temperature of 1050-1300 DEG C, and the heating and cooling integrated plate body is obtained. According to the welding method, the finished hot plate and the finished cold plate are welded into the integrated plate body, poor use caused by the assembly problem is effectively avoided, the stress resistance strength is greatly improved due to the thickness superposition of the two plate bodies, and heating deformation is reduced.

The utility model discloses a deep groove ball bearing stress intensity testing tool which comprises a bottom plate, a motor is arranged at the middle position of the top of the bottom plate, a rotating disc is arranged at the output end of the motor, a limiting assembly is arranged at the middle position of the top of the rotating disc, and a U-shaped mounting plate is mounted at the top of the bottom plate. And a detection mechanism is mounted in the middle of the top of the U-shaped mounting plate. Through the structural design of the rotary table and the components above the rotary table and the cooperation of the extrusion plate, the electric push rod, the motor and the detection mechanism, the hardness and the number of rotation turns of the deep groove ball bearing can be detected at the same time, and during detection, an operator only needs to place the bearing outside the rotary table and the components above the rotary table for limiting; and operators do not need to perform back-and-forth disassembly and assembly detection in the later period, so that the detection steps of the operators in the later period are effectively reduced, and the practicability, flexibility and convenience of the device in the later period are improved.

The invention relates to the field of wood floor detection, in particular to a wood floor stress strength detection device and a detection method thereof.The wood floor stress strength detection device comprises an upper box body, a notch is formed in the upper box body in a penetrating mode, the upper box body is rotationally connected with a rotating column through a sealing bearing, the rotating column penetrates through the inner side of a placing piece, and the placing piece is located in the notch; a support is fixedly installed at the top end of the upper box body, a first hydraulic telescopic cylinder is fixedly installed at the top end of the support, a telescopic rod of the first hydraulic telescopic cylinder penetrates through the inner side of the isolation cover in a sliding mode, two fixing assemblies are arranged above the upper box body, and a discharging assembly is arranged on the outer side of the upper box body. When the wood floor crushing device is used, a placing piece can rotate by 180 degrees through a discharging assembly, broken wood floors in a placing groove can fall into an inner cavity of an upper box body and an inner cavity of a lower box body, the situation that the wood floors which are not completely broken cannot fall into a collecting box is avoided, and the wood floors are blocked by the placing piece in the crushing process; and chippings generated by crushing cannot jump out through the notch.

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 belongs to the technical field of building reinforcement engineering, and discloses a building reinforcement engineering vertical supporting stress uniform distribution device which comprises two longitudinal beams and a cross beam. The cross beam is arranged on the two longitudinal beams, two sets of fixing discs are arranged below the cross beam, a set of supporting rods arranged in a conical shape are connected below the fixing discs, a stress concentration ball is connected below the set of supporting rods, a supporting rod is connected to the center of the bottom of the stress concentration ball, a first arch frame is connected below the set of supporting rods, and a second arch frame is connected below the set of supporting rods. Supporting frames are connected to the two sides of the bottom of the first arch frame. By means of the design, reinforcing of supporting force of the reinforcing cross beam can be achieved, it is guaranteed that stress can be evenly distributed when different areas of the cross beam are stressed, the stress intensity range of the cross beam is increased, and collapse caused by too large local stress of the cross beam is avoided; and therefore, a larger use space can be provided below.

The utility model provides an improved horizontal guide structure, which relates to the field of cold rolling raw material conveying equipment and comprises four shaft brackets, a shaft cover, a locking plate, a horizontal wheel shaft, an upper cover, a horizontal guide wheel body and a lower cover, through the arrangement mode of the horizontal guide wheels, the stress strength of the horizontal guide wheel bodies during deviation rectification can be effectively reduced, then the service life of the horizontal guide wheel bodies is prolonged, meanwhile, the supporting strength and stability of the shaft bracket can be improved in the process that a crane transfers cold-rolled materials, and then the service life of the shaft bracket is prolonged; and therefore, the use effect of the travelling crane is better, and the situation that the travelling crane is hard and cannot run is avoided while the rail gnawing phenomenon is effectively reduced.

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.