440 results about "Stress point" patented technology

The invention relates to the technical field of bridge management, in particular to a bridge informatization management system based on digital twinning. Comprising a stress acquisition device and a traffic flow acquisition device, the stress acquisition device is arranged at a key stress point of a bridge, and the server comprises a bridge modeling module, a data receiving module, a model prediction module and a state analysis module; the bridge modeling module is used for establishing a bridge high-precision three-dimensional model through BIM and constructing a digital twinborn body of the bridge; the data receiving module is used for receiving the sensor measured value uploaded by the stress acquisition device and the traffic flow information uploaded by the traffic flow acquisition device; the model prediction module is used for converting the traffic flow data into a dynamic load and inputting the dynamic load into a digital twinborn body of the bridge for transient analysis to obtain a model prediction value of each bridge key stress point; and the analysis module is used for judging the bridge state according to an error value of the model prediction value and the sensor actual measurement value, and generating bridge state early warning when the error value exceeds an error threshold value.

The invention provides an elastic-plastic unified description method and system for nonlinear characteristics of surrounding rock considering medium-principal stress, and belongs to the technical field of computer aided design. The method comprises the following steps: carrying out a true triaxial mechanical property test on surrounding rock to obtain a surrounding rock total stress-strain curve, extracting characteristic stress points of the stress-strain curve, and carrying out stage division on the stress-strain curve; constructing a characteristic yield surface in the stress space based on the characteristic stress points; based on the staged characteristics of the stress-strain curve, plastic deformation capacity characterization functions of different stages are constructed respectively, and the plastic deformation capacity characterization functions are used for describing the plastic deformation capacity of the stress-strain curve; and constructing a nonlinear hardening-softening equation to describe evolution characteristics of the characteristic yield surface. According to the scheme, the nonlinear characteristics of the stress-strain curve can be more comprehensively and accurately described under different minimum principal stresses and medium principal stresses.

The invention belongs to the field of machining, and particularly relates to a precise centering clamp for an annular thin-wall part. A precise centering clamp for an annular thin-wall part is reasonable in structure, has the self-adaptive adjusting capacity and can achieve precise centering. The precise centering clamp comprises a clamp base and the like. A bottom supporting piece is arranged at the top of the clamp base and can support and place workpieces with different diameters, a circle of rails are arranged on the top of the clamp base in the radial direction of the clamp base, adapters are arranged on the rails in a sliding mode and are in an L shape, clamping jaw bodies are connected to the inner side faces of the adapters, and the clamping jaw bodies can be detached. According to the clamping jaw, the clamping jaw body is divided into two parts through the arc-shaped groove, the clamping jaw body has an open space, so that the two faces of the clamping jaw body can make contact with the outer side wall of the annular thin-wall part, the stress points of the clamping jaw body and the annular thin-wall part are increased, the annular thin-wall part is better fixed, and the clamping jaw body can be prevented from being damaged due to stress.

The invention discloses a space special-shaped steel box girder jig frame and an assembling technology applying the jig frame, and particularly relates to the technical field of steel box girder construction.The space special-shaped steel box girder jig frame is characterized in that middle arch feet are installed at the bottoms of two sets of goose towers, main arch ribs are installed on the two sides of the two sets of middle arch feet, and the overall structure of each main arch rib is in a herringbone shape; auxiliary arch ribs are arranged on the inner sides of the herringbone structures of the main arch ribs respectively, each auxiliary arch rib is specifically composed of an inclined rod and a curved rod, side arch feet are installed at the herringbone tail ends of the main arch ribs respectively, arch rib supports are sequentially arranged below the main arch ribs along radian stress points, and steel box girders are arranged below the arch rib supports 5. The projection on the plane is a cubic parabola, so that the bridge body shows a unique visual effect at different visual angles, an engineering structure and artistic aesthetics are perfectly combined to become an urban landmark building, and the landscape value and cultural connotation of a region are improved.

The utility model relates to a high-load multifunctional lifting appliance which comprises a cylindrical lifting appliance body, a plurality of first lifting arms are uniformly arranged on the outer circumferential surface of the lifting appliance body along the circumference at intervals, a pulley mechanism is mounted on each first lifting arm in a matched manner, and a connecting seat is mounted at the bottom of each pulley mechanism in a matched manner; a second suspension arm is installed at the bottom of each connecting base in a matched mode, the installation position of each second suspension arm on the corresponding first suspension arm is adjusted through a corresponding pulley mechanism, and suspension rod mechanisms are installed at the two ends of each second suspension arm in a matched mode respectively and used for hooking workpieces. The arrangement number and the movement range of the lifting hooks can be increased based on the form of subpackaging small lifting arms, so that the number of lifting stress points of workpieces is increased during lifting appliance operation, the safety and the stability in the lifting process are improved, workpiece deformation is effectively reduced, and the product quality is improved.

The utility model belongs to the field of pipeline construction auxiliary devices, particularly relates to a side slope protection device, and aims to solve the problems that when an existing device is used, the angle can be adjusted to be attached to a side slope for protection, but when the existing device is fixed, main stress points of the existing device are a plurality of conical rods below a bottom plate of the existing device, and when soil is loose, the existing device cannot be attached to the side slope. In order to solve the problem that the safety of the device is reduced due to the fact that the device can be directly and integrally overturned, the utility model provides the following scheme that the device comprises a bottom plate, and a plurality of fixed anchor rods are fixedly connected to the bottom of the bottom plate. When the slope protection device is used, the slope protection device effectively protects and reinforces a slope through the synergistic effect of the reinforcing mechanism and the collapse prevention mechanism, the stability of the whole device can be enhanced through the reinforcing mechanism, and the slope protection device can resist the influence of slope soil loosening or external force. And the anti-collapse mechanism can actively prevent the slope soil from sliding down, so that the occurrence of slope collapse accidents is avoided.

The invention discloses a calibration method of a shock isolation device compression shear testing machine based on a three-way force sensor, and solves the technical problem of low accuracy of an existing calibration method. A multi-component force measurement system based on a three-direction force sensor is adopted to obtain force value measurement data, the complex stress condition of the compression-shear testing machine of the shock isolation device is converted into a six-dimensional force representation form including three-direction component forces and three-direction moments, the compression-shear testing process of the compression-shear testing machine is simulated, and the three-dimensional force representation form of the compression-shear testing machine is obtained. The eccentric position and the real-time stress of a stress point are determined by executing a two-stage measurement process, in the first stage, a vertical static load is pre-added through a vertical actuator, the collection result and the position coordinate information of each single three-way force sensor are obtained, and the eccentric position of the stress point is calculated and determined, and in the second stage, the real-time stress of each single three-way force sensor is obtained. The horizontal actuator is used for applying shear displacement to carry out a compression-shear test, a real-time acquisition result of the three-way force sensor is obtained, real-time stress is calculated, the compression-shear testing machine of the shock isolation device is calibrated, and the accuracy of force value calibration of the compression-shear testing machine is improved.

In order to overcome the problem of degraded bending resistance of existing hinge structures caused by thin elastic members of the hinge structures, the present application provides an amorphous metal elastic hinge part for glasses, comprising an amorphous metal elastic member, a first connecting portion, and a second connecting portion, wherein one of the first connecting portion and the second connecting portion is adapted to be connected to a glasses frame, and the other of the first connecting portion and the second connecting portion is adapted to be connected to a glasses temple; a hinge structure is formed by the first connecting portion and the second connecting portion; the amorphous metal elastic member is arranged around the hinge structure, one end of the amorphous metal elastic member is connected to the first connecting portion, and a gap is reserved between the other end of the amorphous metal elastic member and the hinge structure. According to the present application, the hinge structure and the amorphous metal elastic member form an integrated structure, thereby achieving full space utilization; the amorphous metal elastic member serving as a direct tensile stress point can be prevented from breaking; and the provision of the hinge structure can reduce external force applied to the amorphous metal elastic member and improve the resistance to external force induced breaking of the amorphous metal elastic member.

The invention provides an intelligent robot feeding method and system, and relates to the technical field of humanoid robots, and the method comprises the steps: obtaining a test rubber product image; determining a plurality of initial stress points of the tested rubber product by using an initial stress point model based on the tested rubber product image; determining three-finger stress points based on the plurality of initial stress points of the tested rubber product; generating a plurality of sets of grabbing schemes based on a plurality of initial stress points and three-finger stress points of the tested rubber product, wherein each set of grabbing scheme comprises five-finger stress points; acquiring a captured video of each set of capturing scheme; target grabbing points of the remaining two fingers are determined based on the grabbing video of each set of grabbing scheme; and based on the force bearing points of the three fingers and the target grabbing points of the remaining two fingers, the five-finger robot is controlled to conduct feeding grabbing on the remaining rubber products. According to the method, the adaptive grabbing points of the rubber products can be efficiently and accurately determined, and stable feeding grabbing of the robot is achieved.

The invention relates to the technical field of coal seam stress prediction, in particular to a coal seam three-dimensional stress prediction and visualization method, system and device and a medium, and the method comprises the steps: setting an artificial seismic source and a detection point, exciting a seismic source signal, and collecting a seismic wave response signal and a stress value; carrying out wave field forward modeling simulation through a time fractional order viscoelastic wave equation to obtain a forward simulation wave field, and carrying out full waveform inversion to output three-dimensional wave velocity data; performing reverse time migration imaging on the seismic wave response signal to obtain a three-dimensional coal seam structure mask pattern; performing slicing processing on the three-dimensional wave velocity data and the three-dimensional coal seam structure mask pattern along the same spatial dimension, then combining the three-dimensional wave velocity data and the three-dimensional coal seam structure mask pattern into an input tensor, inputting the input tensor into a convolutional neural network, and outputting a two-dimensional stress prediction slice; and splicing the two-dimensional stress prediction slices to construct a three-dimensional stress body, generating three-dimensional stress point cloud data, and further generating a three-dimensional stress grid model and a structure-stress integrated visual three-dimensional cloud picture. According to the invention, high-precision three-dimensional stress prediction and real-time early warning of the coal seam can be realized.

The invention relates to the technical field of container welding, in particular to an intelligent overturning and welding integrated production line for the front end and the rear end of a container. Comprising a roll-over stand, a welding gun and a mechanical arm, two supporting columns are installed at the upper end of the overturning frame. Rotating plates are rotationally mounted on the surfaces, close to each other, of the two supporting columns; through cooperation of the support and the supporting plate, the supporting plate can clamp the front-end frame or the rear-end frame, so that in the process that the driving motor drives the rotating plate to rotate, the rotating plate can drive the front-end frame or the rear-end frame clamped by the supporting plate to rotate, and workers do not need to use assistive devices such as ropes and iron chains to assist in rotating or overturning of workpieces; in addition, the clamping area of the supporting plate on the front-end frame or the rear-end frame is large, so that stress points between the supporting plate and the front-end frame or the rear-end frame are evenly distributed, the deformation problem of the front-end frame or the rear-end frame is avoided, and the overturning stability of the front-end frame or the rear-end frame is improved.

The invention discloses a tensile property detection device and method for cable processing, and relates to the technical field of performance detection.The tensile property detection device comprises a tensile testing machine, two mounting seats which are distributed up and down are fixedly mounted on the tensile testing machine, wire winding frames are mounted in the mounting seats, and each wire winding frame comprises a fixed mounting seat, a winding rod and a clamping mounting seat; the fixed mounting seat is located on one side of the clamping mounting seat, the rolling rod is fixedly connected between the fixed mounting seat and the rolling rod, a fixing mechanism is mounted in the fixed mounting seat, and a clamping mechanism is mounted in the clamping mounting seat; the cable is wound on the winding rod on the winding frame by two or more layers, mutual friction limitation is achieved through the contact faces between the outer surfaces of the cable winding parts for fixing, the cable is clamped and fixed through a larger stress face, the problem that the cable is broken at the stress point position of the clamping and fixing position is solved, and the cable winding efficiency is improved. And the final tensile property detection data of the cable is more accurate.

The utility model discloses a pneumatic chuck for a glass cloth sending mechanism, which comprises a clamping jaw assembly, the clamping jaw assembly comprises a fixed seat and a plurality of clamping jaws, each clamping jaw comprises a mounting block and a first clamping jaw which are arranged at an included angle, and the connecting position of the first clamping jaw and the mounting block is of an arc-shaped structure, so that the stress area of a stress point is enlarged, the stress is improved, and the service life of the clamping jaw is prolonged. Therefore, the strength of the clamping jaw is enhanced, the situation of jaw breakage is avoided, the number and frequency of replacing the clamping jaw are reduced, and the production efficiency is improved.

The utility model discloses a safety protection shed cover with a rain cover, and particularly relates to the technical field of safety shed covers, the safety protection shed cover comprises a reinforcing transverse plate, a supporting assembly is arranged on the reinforcing transverse plate, and the supporting assembly comprises two reinforcing connecting pieces arranged at the ends of the reinforcing transverse plate respectively. And a plurality of elastic supporting plates for supporting are arranged on the two reinforcing connecting pieces. By arranging the supporting assembly, when the reinforcing connecting piece and the elastic supporting plates are pressed by external force, the elastic supporting plates disperse stress points and transmit the stress points to the reinforcing connecting piece, deformation and damage caused by large load when a certain position is stressed are avoided, and when the device is used, the number of the elastic supporting plates can be increased or decreased according to needs, so that the device is convenient to use. The elastic supporting plate is clamped on the reinforcing connecting piece through the corresponding first clamping groove in the bottom of the elastic supporting plate and the second clamping groove in the reinforcing connecting piece, and the elastic supporting plate can be conveniently and rapidly disassembled and assembled.

The utility model discloses a profile structure for erecting an outdoor awning, which comprises a connecting piece provided with at least one hook part; the fixed beam is provided with a slot matched with the hook part; the connecting piece is provided with at least two supporting plates; the hook part of the connecting piece is matched with the slot of the fixed beam, and the at least two supporting plates are combined, so that the stability of the whole structure is obviously improved. Due to the clamping design of the hook part and the slot, stress is uniformly distributed, and the defect that a single stress point of a traditional screw is easy to loosen is overcome; the double supporting plates are arranged to form double supporting, the bearing pressure is further dispersed, deformation or cracking of the aluminum material caused by single-point stress is effectively prevented, the bearing capacity of the support is greatly improved, and the service life of the support is greatly prolonged.

The utility model relates to the technical field of winding machines, and discloses a winding machine structure capable of adjusting winding length and preventing wire breakage, which comprises a frame, an equipment table is fixedly mounted on one side of the frame, a fixing frame is fixedly mounted on one side of the front end of the frame, a branching roller is rotatably connected in the fixing frame, and an adjusting mechanism is arranged in the frame; the adjusting mechanism comprises a servo motor, the servo motor is embedded in one end of the fixing frame, and a threaded rod is fixedly installed at the power output end of the servo motor. Through the design of the servo motor, the threaded rod, the sliding frame, the limiting frame, the limiting groove and the abutting wheel, the wire winding length is adjusted to be increased, stress concentration during wire winding is reduced, and the wire winding quality is improved. And meanwhile, the contact wheel is matched to increase stress points, the stress is further dispersed, the smoothness of the conveying process is kept, and therefore the protection performance of the silk threads can be further improved.

The invention relates to the technical field of rubber suspensions, in particular to a rubber suspension system with an embedded damper, which comprises an upper mounting seat and a lower mounting seat, a damping main spring and an auxiliary spring are arranged between the upper mounting seat and the lower mounting seat, a lower support group is arranged in the middle of the lower mounting seat, and upper support groups are arranged at the lower ends of the two sides of the upper mounting seat. The main damping spring is located between the side end of the lower support set and the upper support set, the auxiliary spring is located between the upper end of the middle of the lower support set and the upper support set, a damper coaxial with the main damping spring is embedded in the main damping spring, and the two ends of the damper are connected to the upper support set and the lower support set respectively. An upper sealing unit and a middle sealing unit are arranged on the upper portion and the middle portion of the damper respectively. According to the scheme, the gravity center and the overall height of the suspension can be reduced, stress points of the balance beams are dispersed, and the service life is prolonged.

The application provides an engine piston skirt rigidity measuring device and method, and relates to the technical field of engine pistons. The engine piston skirt rigidity measuring device and method are suitable for measuring the rigidity of the engine piston skirt, adopt a full-displacement constraint mode to completely fix the piston, adopt a symmetrical pressurizing mode to pressurize the piston skirt measuring points, ensure that the piston skirt measuring points are balanced in stress, adopt a high-precision laser displacement sensor to non-contact accurately measure the piston stress points and surrounding measuring points, can accurately measure the displacement of the piston measuring points and surrounding stress deformation points, and can further solve the rigidity value of the piston. Not only can the application provide important data support for high-strength and lightweight piston design, but also can provide reliable boundary input parameters for piston dynamics calculation, and has extremely important significance for the service life of the piston and the research on the economy, reliability and safety of the engine.

The utility model provides a blade ring, a fastener and a high-pressure-resistant joint device, a pipeline connecting section and a fastener connecting section are arranged in the blade ring, and a connecting structure matched with the blade ring is arranged on the outer wall of the fastener. The joint device comprises a blade ring, a first fastener and a second fastener. The pipeline is fastened in a multi-stage mode through the connector device, under the condition that the pipeline and the connector device are both made of PEEK materials, the pressure resistance of the pipeline and the connector device can be larger than 80 Mpa and even reach 200 Mpa after the pipeline and the connector device are made of stainless steel or titanium materials, and the application requirements of ultra-high performance liquid chromatography and mass spectrometry can be met. Meanwhile, the fastening point positions of the pipeline to be fastened are distributed at all positions of the pipeline, so that stress point positions of the pipeline are dispersed, the stress concentration phenomenon of the pipeline is relieved, the stress borne by a single stress point of the pipeline is greatly reduced due to the dispersed stress point positions, and the situation that the pipeline is seriously deformed and blocked due to stress concentration is avoided.

The invention provides a vertical shaft double-layer steel shaft wall lifting system which comprises a base plate, a lifting rod parallel to a double-layer shaft is rotatably inserted in the base plate, a first limiting plate parallel to the base plate is fixed to the bottom of the lifting rod, and a second lifting lug is arranged at the top of the lifting rod. And the first limiting plate is rotated to be staggered with the base plate in a manner of rotating the lifting rod, so that when the double-layer shaft is lifted, the top surface of the first limiting plate can be in contact with and lift the bottom wall of the upper flange plate. The auxiliary mechanism is used for assisting in pressing the top wall of the upper flange plate corresponding to the first limiting plate in position before lifting. Hoisting connection is achieved by using the original pouring hole in the upper flange plate as a stress point, mounting and dismounting operation of the hoisting structure on the pouring hole can be efficiently completed before and after hoisting, the single-section hoisting efficiency of the double-layer shaft is improved, reutilization can be achieved, cost is saved, and it is ensured that the inner wall structure of the double-layer shaft is not damaged.

The utility model discloses a low-gravity-center lead screw type intelligent lifting working platform which comprises a building body, a heavy frame and a working platform body. A supporting structure is fixedly arranged on the outer side of each layer of beam body of the building main body; the heavy frame is sleeved with the working platform, a lifting device is arranged between the working platform and the heavy frame, and the working platform and the heavy frame move relatively through the lifting device so as to achieve the purpose of lifting; and the lifting device is positioned above the gravity centers of the heavy frame and the working platform. Compared with the prior art, the utility model has the advantages that the structure is simple, and the use is convenient; the problems that the gravity center of a lifted frame body is higher than the stress point of the lifted frame body, and the frame body overturns and falls due to the fact that the frame body is affected by moment are solved. The situation that a traditional protection platform can only achieve one-way falling prevention is thoroughly improved; the working platform can be provided with two anti-falling devices for protection during ascending or descending bidirectional movement; through reverse operation, the effect that the working platform descends on the periphery of the building body layer by layer is achieved; and labor, material and time costs are saved.

The utility model discloses a splicing installation structure of a fishbone spliced floor, which comprises two symmetrically arranged splicing plates, two parallel straight face edges are arranged on two sides of each splicing plate along the length direction of the splicing plate, and two parallel inclined face edges are arranged at two ends of each splicing plate; the splicing inserting plate is fixedly connected to the middle of one of the straight face edges, and a splicing inserting groove matched with the splicing inserting plate is formed in the middle of the other straight face edge. The splicing plate has the advantages that the splicing inserting plate corresponds to the splicing inserting groove, the two splicing plates can be arranged and spliced, and the splicing plate can be conveniently spliced by adjusting the position; the connection mode is more diversified, more shapes can be spliced, and various splicing effects are more attractive; the connecting piece is provided with the limiting grooves and the V-shaped grooves, so that a plurality of stress points and supporting points are arranged on the outer side of the connecting piece, the stress points are distributed more evenly, production and machining are easier, and falling off between the connected floors can be effectively prevented.

The utility model provides a novel small work robot, which relates to the field of carrying and stacking and comprises a base, a stand column and a universal arm, the stand column is arranged on the base, a lifting mechanism used for lifting the universal arm is arranged in the stand column, a counterweight assembly is further arranged in the stand column, the counterweight assembly is connected with the lifting mechanism through a chain, and the universal arm is arranged on the stand column. A first fixed pulley and a second fixed pulley are rotationally arranged on the top of the stand column side by side, the chain winds around the first fixed pulley and the second fixed pulley, one end of the chain on one side of the first fixed pulley is perpendicularly connected with the lifting mechanism, and one end of the chain on one side of the second fixed pulley is perpendicularly connected with the counterweight assembly. According to the novel small-sized robot, the two ends of the chain are vertically hung through the first fixed pulley and the second fixed pulley, so that stress points are located at the center positions of the lifting mechanism and the counterweight assembly, friction between the lifting mechanism and the guide rail and friction between the counterweight assembly and the guide rail are small during lifting, lifting is smoother, and abrasion is small; and the service lives of the lifting mechanism and the counterweight assembly are greatly prolonged.

The invention relates to the technical field of clamps, and discloses a clamp with a flexible floating clamping function and a clamping method.The clamp comprises a first supporting plate and a second supporting plate which are perpendicular to each other, the first supporting plate is used for fixing a connecting flange of a workpiece, a support is arranged on the second supporting plate, and a floating clamping mechanism is arranged on the side, away from the first supporting plate, of the support; the floating clamping mechanism is used for fixing an overhanging mechanism of a workpiece, the floating clamping mechanism moves on the support along a first preset path so as to be away from or close to the overhanging mechanism, and the rotary clamping mechanism is arranged on the side, away from the second support plate, of the first support plate and used for laterally fixing the overhanging mechanism. In combination with the working characteristics of the clamp, the box overhanging mechanism is fixed in multiple directions through the floating clamping mechanism and the rotary clamping mechanism, the overall clamping rigidity and machining stability of a workpiece are improved, the machining efficiency is improved, the machining quality of the workpiece is stabilized, stress points are reasonably distributed in the clamping process, and the machining precision is improved. And easy deformation in clamping and abrasion to the surface of the workpiece are avoided.

The utility model discloses an ejection device for stamping die machining, which comprises a mounting seat assembly, a driving assembly is arranged at the top of the mounting seat assembly, an upper sliding seat is arranged at the top of the driving assembly, and an ejection assembly is arranged on the inner wall of the upper sliding seat; the ejection assembly comprises a mounting plate, a plurality of ejection heads are arranged at the top of the mounting plate, and a mounting rod is movably connected to the bottom of the mounting plate; the bottom of the ejection head is connected with the inner wall of the mounting plate in an inserted mode. According to the ejection device for stamping die machining, the ejection assembly is arranged and used in cooperation with the upper sliding base, in the using process, the installation rod can be rotated according to needs to disassemble the ejection assembly, and then the position of the ejection head is adjusted and installed according to a stress point and a stress supporting point in the workpiece stamping process in a new die; and then the ejection assembly is re-installed through the installation rod, so that the good cooperative use effect between the ejection assembly and the mold is achieved, the use effect of the device is improved, and convenience is provided for a user.

The utility model relates to the technical field of injection molds, in particular to an injection mold with an air ejection discharging structure. The injection mold mainly aims at solving the problems that a common injection mold is easily influenced by a jacking structure in the injection molding process, so that the bottom end of part of the jacking structure is arranged in a pressure cavity and does not rise, jacking and discharging of an injection molding part are influenced, meanwhile, due to the fact that stress points of the injection mold are not uniform in the jacking process, the finished injection molding part is damaged and deformed, and the product quality is poor. According to the technical scheme, the injection mold comprises a lower mold base and an upper mold base, a pressure cavity is formed in the lower mold base, a jacking assembly facilitating jacking and demolding of an injection molding part is arranged at the position of a molding cavity and the pressure cavity of the lower mold base, and the jacking assembly comprises a jacking block. According to the utility model, the risk of damage and deformation caused by non-uniform stress of a product in the jacking and discharging process is reduced while jacking and discharging are realized.

The invention discloses a special pulling device for a large case PCBA (Printed Circuit Board Assembly) board, which comprises a pulling handle and a plurality of pulling tensioners matched with the pulling handle, and the pulling tensioners are matched with mounting holes of the PCBA board, so that the stress positions of the PCBA board are the positions of the mounting holes. By arranging the pulling handle and the plurality of pulling expanders matched with the pulling handle, and the plurality of pulling expanders are respectively matched with the plurality of mounting holes, the plurality of mounting holes become a plurality of stress points, so that the PCBA board is subjected to a plurality of stresses at the same time when being pulled out, the stress at a certain position is balanced, the stress is uniform, the PCBA board is pulled out quickly and stably, and the pulling efficiency of the PCBA board is improved. And violent pulling is avoided.

According to the patch cord convenient to disassemble and assemble, a first reinforcing sleeve is arranged at one end, close to a first adapter, of a patch cord body, the patch cord body penetrates through the first reinforcing sleeve, a shifting block is fixedly arranged at the rear end of the first reinforcing sleeve, a supporting rod connected with the first adapter is arranged at the front end of the first reinforcing sleeve, and a butt joint seat is arranged at the rear end of a second adapter. A second reinforcing sleeve through which the patch cord main body penetrates is arranged at one end, close to the second adapter, of the patch cord main body, a force bearing point can be provided for the first adapter through the arranged shifting block, the first adapter can be conveniently plugged and unplugged, a force bearing point can be provided for the second adapter through the arranged fixing seat, and the second adapter can be conveniently plugged and unplugged. Therefore, the second adapter is convenient to plug and unplug, so that the patch cord main body is convenient to disassemble and assemble when in use.

The invention relates to the technical field of constructional engineering, and discloses a foldable cantilever scaffold device. Through the collaborative design of the folding assembly (the supporting piece and the adjusting rod) hinged to the I-shaped steel and the sliding assembly, the traditional upward pulling type and downward supporting type functions are integrated, and double-mode dynamic switching is achieved; the angle rotation of the supporting piece enables the device to be flexibly switched between a cantilever downward supporting mode and a cable-stayed anchoring mode; a U-shaped sliding block of the sliding assembly slides along a flange of the I-shaped steel, the position of a limiting rod is adjusted in real time along with the length of the cantilever through an adjusting bolt, and it is ensured that supporting force accurately acts on the optimal force bearing point; the equidistant holes of the adjusting rod are matched with the bolts of the limiting rod to provide multi-gear height adjustment to adapt to different floor heights and loads. The supporting piece and the adjusting rod are hinged, so that the anti-overturning force of an upward-pulling mode and the stability of a downward-supporting mode are enhanced respectively. The device can be folded and stored in I-shaped steel flange plates, the storage and transportation space occupancy rate is remarkably reduced, and standardized components support repeated use. The problems that a traditional scaffold is single in function and rigid in adjustment are solved through a modular pin joint, sliding locking and dual-mode bearing system, and a standardized high-adaptability supporting scheme is provided for high-rise and special-shaped structures.

The invention provides a Rockwell hardness tester and a hardness measuring method. The Rockwell hardness tester comprises a rack, a driving part, a pressure sensor, a guide rod and a distance measuring module, a test bed is arranged at the bottom of the rack; the driving part comprises a fixed seat and a moving shaft, the fixed seat is mounted at the top of the rack, and the moving shaft faces the test bed; in a natural state, the pressure sensor is separated from the moving shaft; in the working state, the pressure sensor abuts against the moving shaft. One surface of the pressure sensor facing the motion shaft is a spherical surface; one end of the guide rod is connected with the pressure sensor, and the other end is connected with a pressure head; the distance measuring module is located on one side of the motion shaft and used for measuring the motion distance of the motion shaft. The hardness measuring method adopts the Rockwell hardness tester. One end face of the pressure sensor is designed into the spherical surface, so that the contact between the pressure sensor and the moving shaft of the driving part is changed into point contact, the vertex of the spherical surface is a stress point, the accuracy of the stress position of the pressure sensor is ensured, and the hardness measurement precision is improved.