1132 results about "Joint surface" patented technology

The invention discloses a friction stir welding device for a large-curvature thin-wall round pipe type structure, which comprises a weldment clamping tool, a clamping tool supporting mechanism, a stirring welding main shaft, a stationary shaft shoulder stirring welding stirring head and a filling stirring welding stirring head, and further discloses a using method of the device. According to the method, after the joint surfaces of the two round pipes are welded through friction stir circular seam welding of the stationary shaft shoulder, the end part of the filling rod is reserved in the keyhole for filling by using a filling friction stir welding method to finish welding, the method is a solid-phase welding method, and compared with melting welding methods such as electric arc welding and laser welding, the performance of the welded joint is better.

The invention discloses a steel-concrete joint surface defect identification method based on air coupling ultrasonic guided waves, which comprises the following steps: S1, selecting an ultrasonic guided wave mode and a probe frequency, and determining an incident angle theta of an air coupling excitation probe; s2, constructing a detection system according to the parameters in the step S1; s3, constructing a data set, wherein the acquisition mode of the sample of the ultrasonic guided wave signal in the data set comprises the following steps of: performing actual detection by adopting the detection system to obtain the sample of the ultrasonic guided wave signal; by solving the air coupling ultrasonic three-dimensional finite element calculation model, obtaining a sample of an ultrasonic guided wave signal under the condition that interference factors and joint surface defects exist; s4, training the recognition model by using the data set; the input of the recognition model is the time domain feature and the frequency domain feature of the ultrasonic guided wave signal, and the output of the recognition model is a defect probability value of a measuring point corresponding to the ultrasonic guided wave signal; and S5, identifying the ultrasonic guided wave signal of each measuring point by adopting the trained identification model so as to calculate the defect probability of each measuring point.

The invention relates to the field of geotechnical engineering, and discloses a self-stress anchor rod failure evolution simulation method for jointed rock mass bolting-grouting reinforcement, which comprises the following steps: S1, constructing a three-dimensional rock mass model containing a joint structure in an FLAC3D platform, and defining joint surface space distribution and geometric parameters; s2, a bolting-grouting structure is introduced into the three-dimensional rock mass model, an anchor rod, a grouting body and the contact relation between the anchor rod and the grouting body and the rock mass are set, and an anchor rod load transfer model is established; s3, a loading path is set, displacement control is adopted as a loading mode, and a certain included angle is formed between the loading direction and the joint surface; and S4, establishing a numerical model in FLAC3D, performing grid division, and setting a rock mass material constitutive model and contact surface parameters. By accurately controlling the loading direction and the loading angle in simulation and analyzing the change influence of different loading paths on the failure mode of the bolting-grouting structure, the problem that the traditional simulation method neglects the change of the failure mode under different loading conditions is solved.

The invention designs an assembly process error modeling method considering heat, and realizes rapid and accurate calculation of thermal deformation of an assembly junction surface affected by heat in the part assembly process. In the part assembling process, heat generated in the assembling process is an important influencing factor influencing the assembling precision. In order to realize rapid calculation of thermal deformation in a part assembling process, a prediction model of thermal deformation of an assembling joint surface in the part assembling process is constructed by utilizing a physical information neural network. According to the method, a full-connection neural network architecture is adopted, and boundary condition constraints are introduced into a loss function item for joint optimization training. Through minimization of a loss function, a driving model learns displacement distribution characteristics of an assembly joint surface under thermal deformation, and a mapping relation between a space coordinate point and a corresponding displacement amount is established. The model finally realizes the real-time prediction capability of the thermal deformation field of the assembly joint surface.

The invention belongs to the technical field of direct shear-seepage tests of rock joints, and discloses a numerical test method for direct shear-seepage of rock joints under different boundary conditions, which comprises the following steps of: establishing a joint surface numerical model by using finite element software, and performing tests for simulating joint shear mechanical behaviors by applying different boundary conditions. And the contact state and the opening distribution of the joint surface under different shear displacements are obtained, so that the shear stress evolution mechanism of the joint surface is better revealed, and the mechanical behavior of the rough joint surface in the shear process is accurately expressed. According to the method, the evolution law of mechanical properties in the joint shearing process can be reflected, the influence of shearing deformation on the joint seepage characteristics can be reflected, joint opening data distribution is imported into programming software to be processed, a joint seepage numerical model is constructed, then multi-physics field simulation analysis software is imported, and the joint seepage performance is improved. The flow velocity, the osmotic pressure and the streamline distribution characteristics in the flowing process are calculated, so that the joint permeability characteristics are analyzed.

The invention provides a machining method for a three-petal type stator machining assembly with two-stage blades of an aero-engine. The machining method can solve the problems that the two-stage blades in a three-petal type stator are difficult to machine, parts are large in deformation after spraying and combined machining, and the shape and position sizes such as the blade profile tolerance, the flow channel profile tolerance and the concentricity of assembly parts at the front end and the rear end of the stator are out of tolerance. The method comprises the following steps of blank inspection, rough turning of an inner shape and an outer shape, rough milling of an outer shape, milling, finish milling, clamp trimming, finish trimming, finish turning, finish milling, finish turning, inspection, spraying, turning of a large-end coating, turning of a small-end coating, grinding of a blade tip, clamp trimming of a mark, fluorescent penetrant inspection and final inspection. The method is characterized in that: The working procedures between the outer shape rough milling step and the inspection step specifically comprise segmentation, stress relief heat treatment, joint surface and hole milling, grinding, combination, benchmark trimming, two end and inner shape fine turning, outer shape finish milling, splitting, blade shape finish milling, clamp trimming, combination, large end benchmark fine trimming, small end finish turning, small end lace and hole finish milling and large end finish turning. .

The invention discloses a vacuum brazing quality detection method for a heat dissipation structure and related equipment, and the method comprises the steps: obtaining heat flux density distribution data of the heat dissipation structure, and dividing the heat dissipation structure into different functional regions according to a thermal efficiency index; differential thermal pulses are applied to the heat dissipation structure in the vacuum brazing process, and thermal pulse response data and technological process monitoring data are obtained; calculating a thermal response characteristic parameter, comparing the thermal response characteristic parameter with a preset parameter range, identifying an abnormal state and generating a process adjustment instruction; performing time-space synchronization processing on the thermal response characteristic parameters and technological process monitoring data, and determining defect types, positions and severity; and performing a thermal load test to obtain heat conduction characteristic data, and quantitatively evaluating the structural integrity and the heat conduction performance of the brazed joint surface. According to the method, the defects of the internal joint surface can be detected in real time in the vacuum brazing process, the heat dissipation performance is accurately evaluated, and the limitation of a traditional detection method in coping with a complex geometric structure is solved.

The invention discloses a machine tool structural part material matching design method for forward design of a machine tool. The method comprises the steps that 1, material attribute parameters such as damping loss factors and elasticity modulus of materials are obtained through experiments; 2, calculating a fixed joint surface parameter based on a Jiyun Xiaopian integral method, and calculating a sliding and rolling joint surface parameter based on a product manual; 3, establishing a finite element model considering parameters of the joint surface, and extracting static and dynamic response values of key nodes of the machine tool through a simulation result; 4, determining the complexity of the model through DOE analysis, and constructing a response surface model of the response variable and the independent variable; 5, global search is conducted in the design space based on a multi-target rime optimization algorithm, the material combination mode of all structural parts is optimized, and the machine tool reaches the optimal balance point on the multiple dynamic performance indexes on the basis that the static rigidity is met; and step 6, comparing and analyzing static and dynamic properties before and after material matching optimization through a simulation result, and verifying a material matching effect.

The invention discloses a joint surface contact stiffness calculation method considering interaction of a micro-bulge and a matrix, which is characterized in that additional deformation generated by the matrix is calculated on the basis of an elastic theory and micro-bulge stress analysis, the actual normal deformation of the micro-bulge is obtained, and then the critical sectional areas of plastic deformation, elastic plastic deformation and elastic deformation of the micro-bulge are calculated. The interaction is considered on the basis of previous research, the real contact area and the contact load expression of the joint surface are obtained through integration, and the maximum contact sectional area is obtained according to the actual load condition. The contact stiffness of the joint surface is obtained by integrating the stiffness of the micro-convex bodies with elastic deformation and elastic plasticity, and the accuracy of a theoretical model is verified by comparing modal simulation with an experimental result. Compared with other technologies, the method can more accurately predict the theoretical stiffness value of the joint surface.

A connection structure has an extension direction and includes a fitting part, a fixing part, and a turning part. The fitting part includes two joint surfaces. The fixing part includes a surface. The turning part is connected between the fitting part and the fixing part, and the turning part is inclined relative to the fitting part and the fixing part. One of the two joint surfaces of the fitting part faces a same direction as the surface of the fixing part. An offset distance is between one of the two joint surfaces and the surface along a direction vertical to the extension direction. Thus, the connection structure of the present disclosure can prevent two different antenna modules in the electronic device from interfering with each other.

The forming device comprises an upper die, a lower die, an insert and a mold core, the mold core is arranged in a forming cavity of the lower die, the top face of the mold core is attached to the bottom face of the upper die after die assembly, the lower die and the mold core are combined to form an annular groove used for containing the insert, the top of the insert is flush with the top face of the lower die, and the insert is arranged in the annular groove. The upper mold forming cavity, the insert and the mold core are combined to form a molded surface of the special-shaped rubber mat, the contact surface of the outer circular surface of the insert and the lower mold is a conical surface, the insert is convenient to assemble, disassemble and position, and a plurality of through holes for ejecting the insert are formed in the bottom of the lower mold; the insert is divided into a plurality of petals, one of the joint surfaces of the two petals of the insert at the petals is provided with a convex surface, the other surface is provided with a convex surface, and the concave surface is tightly matched with the convex surface, so that the petals of the insert are ensured to be consistent up and down without dislocation, a step surface at the joint of parts is eliminated, and the special-shaped rubber mat is ensured to be difficult to demould at lower cost. Steps at the joint of the parts are eliminated, the part quality is improved, and part demolding is facilitated.

The invention provides a blade shroud shielding device for blade parts. The blade shroud shielding device comprises a first shielding part and a second shielding part, the second shielding piece is detachably connected with the first shielding piece, and the second shielding piece and the first shielding piece jointly define a containing space for containing parts; a first hollow area is formed in the first shielding piece, and the accommodating space is communicated with the outside through the first hollow area; the second shielding piece is provided with a second hollow area, and the second hollow area enables the containing space to be communicated with the outside. When the blade shroud shielding device shields the part, the first joint face of the part extends out of the containing space through the first hollowed-out area, and the second joint face of the part extends out of the containing space through the second hollowed-out area. Compared with the prior art, the blade shroud shielding device for the blade parts is simpler in clamping process, the production efficiency can be improved, the labor cost can be reduced, and the requirement for automatic mass production can be met.

Seal arrangement for a joint of two joint elements, in particular realized as a monopile and a transition piece, of an offshore structure, preferably an offshore wind energy installation, in particular a substructure thereof, in which, for the purpose of producing a stable joint, an upper joint element and a lower joint element are inserted into each other in a clamping manner by means of at least one seal unit, comprising one of the joint elements and the at least one seal unit fixed to the joint element, in such a manner that the seal unit, in a joining position, is arranged between an inner joint surface of one joint element and an outer joint surface of the other joint element, at least one seal unit having at least one elastic sealing element, which extends in the circumferential direction around the entire circumference and the thickness (D) of which is greater than the thickness (D′) of an adjoining seal unit region and method for producing a seal arrangement.

The invention relates to the technical field of steel structure welding, in particular to a full-penetration back-gouging-free welding process for a welding seam between a web plate and a wing plate of a crane beam. Comprising the following steps: preparing a web groove; welding steel plate pairs; web plates and wing plates are placed; backing a weld bead on the groove surface; welding the back surface once; and the other welding beads are formed on the groove surface. According to the full-penetration back-gouging-free welding process for the weld joint between the web and the wing plate of the crane beam, the weld joint penetration depth of groove surface welding and non-groove surface welding can better fuse the joint surface of the web and the wing plate, the sections of the two weld beads can be partially overlapped by selecting proper process parameters, and therefore full-penetration welding is ensured.

A polymer double-cavity prefilled syringe comprises a barrel with a bypass, the barrel is provided with a finger handle and an adapter, a needle seat is arranged on the adapter, a needle body is fixed on the needle seat, and a protective cap is arranged on the outer side of the needle body. A front plunger, a middle plunger and a rear plunger are arranged in the barrel, and the rear plunger abuts against a plunger rod. The cylinder is formed by integral injection molding of polymer, a group of ribs which are arranged side by side and protrude towards the interior of the cylinder are arranged on the inner wall of the cylinder, the axial length of each rib is larger than that of the middle plunger, the bypass is formed by a gap between every two adjacent ribs, and the outer diameter of the cylinder is larger than that of the adapter; the protective cap is tightly connected with the needle seat, a first anti-falling mechanism is arranged on the joint face of the protective cap and the needle seat, and an inner cavity of the protective cap is communicated with the outside through a bacteria-blocking, hydrophobic and breathable filter membrane. The bypass is formed in the mode that the protruding edges protrude inwards, demolding is convenient, integrated injection molding machining can be conducted through polymers, cost is low, damage is not prone to occurring, and the using effect is good. The outer surface of the cylinder is smooth, the heat conduction performance is good, and the vacuum freeze-drying efficiency is high.

The invention relates to a dangerous rock mass automatic cutting and accurate model construction method based on point cloud data, and belongs to the field of dangerous rock mass segmentation and three-dimensional model construction. According to the method, the point cloud data obtained by the unmanned aerial vehicle and the inclination angle information of the joint surface are combined, the automatic method capable of achieving accurate segmentation of the joint surface of the dangerous rock mass and generating the accurate model is provided, and the real joint surface in the accurate model of the dangerous rock mass is a curved surface grid. The method aims at improving the modeling efficiency and accuracy of the three-dimensional model of the dangerous rock body, and complexity and errors caused by manual segmentation are avoided; the method can overcome the problem that a dangerous rock body model is inaccurate due to traditional plane structural plane cutting, and the accurate model can make statics analysis and dynamics research on the dangerous rock body more accurate, so that a guarantee is provided for the dangerous rock body to possibly bring human life and property safety risks.

The invention provides a scraping and grinding method for an annular rotary indexing table base. The scraping and grinding method comprises the following steps that S1, a tool is prepared; s2, base coarse adjustment is conducted, specifically, each hydrostatic guideway plate on the base and a base inner ring bearing row are leveled, and the base is fastened and leveled; s3, finely adjusting the base, measuring a gap value between a joint surface of the workbench and the toothed crossed cylindrical roller turntable bearing and an inner ring of the base, and carrying out secondary fastening and leveling on the base until the difference value of the gap value is within 0.1 mm; s4, a toothed bearing is installed, the gap between the bottom of the toothed bearing and the inner ring of the base is measured, and an adjusting pad is ground in a matched mode; s5, dragging and scraping combined grinding: coating a proper amount of red lead powder on the guide rail surface of the base, hoisting the worktable on the base, rotating the worktable to carry out dragging and scraping combined grinding, hoisting the worktable, and scraping and grinding the base by utilizing a grinding tool; s6, scraping and rechecking: checking the parallelism of the bearing mounting surface of the inner ring of the base and the guide rail surface of the outer ring; and if the technological requirements are not met, the steps S5-S6 are repeated. According to the application, the scraping convenience and accuracy of the annular rotary indexing table base can be improved.

The invention discloses an aluminum wiring terminal, a wiring terminal unit and an assembling method, and the method comprises the steps: carrying out the laser etching of a joint surface of an aluminum conductive sheet, forming a pretreated conductive sheet with a micro-nano structure, depositing a protective coating on the joint surface, and carrying out the curing, and obtaining a conductive sheet with a protective coating. And then crimping and assembling with an insulating shell assembly to form a crimping assembly, and fixing bolts are arranged in the insulating shell assembly. Applying resonance fastening of characteristic frequency to a fixing bolt in the crimping assembly, injecting a lubricating medium in the fastening process, performing synchronous detection and verification of multi-physical field parameters on the fastening assembly, and feeding back detection data to a production control system to optimize assembly process parameters; the micro-nano structure is constructed on the joint surface of the conducting strip and the protective coating is deposited, so that the interface conductivity and oxidation resistance are remarkably improved, online detection and dynamic feedback optimization are integrated, and the consistency and reliability of the product are improved.

The invention discloses a machine tool dynamic characteristic finite element calculation method based on bolting joint surface parametric modeling, and belongs to the technical field of bolting joint surface and machine tool overall modeling and simulation. According to the method, a gantry machine tool reduced scale model is taken as an example, contact parameter calculation is conducted on bolting joint surfaces based on the fractal theory, then finite element parametric modeling is conducted on the bolting joint surfaces through an abaqus basic connector unit, and dynamic performance analysis of the whole machine is completed. Compared with a test method, the accuracy of the method is proved. According to the method, more accurate and more efficient calculation of the dynamic performance of the machine tool is realized, and a theoretical basis is provided for subsequently exploring the influence of each combination surface on the dynamic performance of the whole machine.

A finger orthosis comprises a sheath worn outside a palm, an orthosis support and a joint support. The joint support comprises a connecting arm and a suspension arm, the suspension arm is arranged on the connecting arm so that the connecting arm can be suspended, the correcting support is movably connected with the connecting arm, and the fixing base is locked after the correcting support axially moves along the connecting arm according to the length of the phalanx or the correcting stress position. And the traction mechanism is assembled with the sheath and is arranged on the back of the hand. The traction piece is in contact with the joint supports, one end of the traction piece is fixed to the joint support at the far end of the finger, the other end of the traction piece is arranged on the traction base, acting force is applied to the traction piece, the relaxation state of the traction piece is adjusted, and the finger with flexor tendon contracture is corrected. Compared with an existing fixing support, the finger orthosis provided by the invention has the advantages that the operation intensity and operation time consumption are obviously reduced, the articular surface is not damaged, subcutaneous blood vessels and nerves of fingers are not easily damaged, and the risk of disability caused by bleeding and nerve touch is reduced or avoided.

The invention provides a preparation method of a CoCrNi medium-entropy alloy / 316L stainless steel composite sheet, and belongs to the field of metal matrix composite material forming. The preparation method comprises the following steps: preparing the CoCrNi medium-entropy alloy / 316L stainless steel composite thick plate by adopting an explosive welding method; cutting a blank with good interface bonding from the composite thick plate; then multi-fire and multi-pass hot rolling is carried out; performing multi-pass cold rolling on the hot-rolled plate after annealing; and stress relief annealing is conducted after cold rolling, and the medium-entropy alloy / stainless steel composite sheet is obtained after air cooling. The CoCrNi medium-entropy alloy / 316L stainless steel composite sheet obtained by the method is uniform in thickness, flat and straight in joint surface, excellent in mechanical property, simple in production process and suitable for industrial production.

The invention relates to the technical field of material brazing, and provides a welding method for quartz glass, which comprises the following steps: preparing nano-silver paste; coating the nano-silver paste on the bonding surface of the quartz glass and the material to be connected; the bonding surface of the quartz glass and the bonding surface of the to-be-connected material are in contact and abut against each other, and the nano-silver paste is melted to form a welding joint; and cooling the welding joint, the quartz glass and the material to be connected. According to the welding method for the quartz glass, the connecting strength between the quartz glass and the to-be-connected material can be improved, and the situation that the quartz glass cracks is reduced.

The utility model discloses a post-cast ultra-high performance concrete structure between a prefabricated top plate and prefabricated walls, which is characterized in that wall joint surfaces of the two prefabricated walls are arranged on two sides of a top plate joint surface of the prefabricated top plate to form a groove structure with a concave cross section; a plurality of top plate overhanging steel bars in one-to-one correspondence are arranged on the two top plate combination surfaces and are arranged in an inner row and an outer row in the thickness direction of the prefabricated top plate; each pair of coaxially-arranged top plate overhanging steel bars in the two rows of top plate overhanging steel bars close to the outside of the two prefabricated top plates are provided with additional steel bars; a plurality of transverse steel bars are arranged on the additional steel bars in the width direction of the groove structure; and ultra-high performance concrete is poured in the groove structure. During construction, the prefabricated wall and the prefabricated top plate are manufactured firstly; then temporarily fixing in place through a temporary support; additional steel bars and transverse steel bars are arranged, and finally ultra-high performance concrete is poured. The device is convenient to install, the project construction period can be shortened, the construction risk is reduced, and good social and economic benefits are achieved.

The invention provides an acceptance method and equipment for a concrete construction joint, and the method comprises the steps: obtaining the point cloud data of the surface of the construction joint after the concrete construction joint is coated with a retarder and is subjected to roughening in a final setting stage, and reconstructing a three-dimensional surface topography model of the surface of the construction joint according to the point cloud data; performing triangular meshing on the three-dimensional surface topography model to obtain the area of each triangular mesh surface and the projection area of each triangular mesh surface on the concrete construction joint plane; the ratio of the total area and the total projection area of all the triangular mesh faces is obtained to serve as a current roughness evaluation index of the surface of the construction joint; and according to the current roughness evaluation index and a preset construction quality requirement, generating an acceptance opinion of the construction joint. The quantitative roughness evaluation index is obtained based on the point cloud data of the surface of the construction joint, and acceptance is performed according to the roughness evaluation index, so that whether the construction joint treatment meets the requirement can be quickly and accurately judged, and the construction quality of the concrete construction joint and the stability and reliability of the structural performance are ensured.

The utility model discloses a combined hydraulic clamp for processing a semicircular hole, a slip groove and a spigot surface of a bearing cover, which comprises a clamp bottom plate, a positioning piece, a clamping piece and a workpiece, the workpiece, the positioning piece and the clamping piece are arranged on the clamp bottom plate, the clamping piece comprises an auxiliary supporting cylinder, a side pressing cylinder and a main lever cylinder, and the auxiliary supporting cylinder is arranged below the workpiece; a side pressing cylinder is arranged on the separating and combining surface of the workpiece for pressing; a main shaft hole for a main lever cylinder to press the workpiece is further formed below the workpiece, the positioning piece comprises a round positioning pin and a diamond positioning pin, and the end face of the round positioning pin and the end face of the diamond positioning pin are equal in height to form one-face two-pin full positioning. The bearing cover part boring and finish-milling face centralized production can be achieved, the problem that the perpendicularity quality of a bearing cover spigot pair two large faces and the perpendicularity quality of a spigot pair splitting and combining face are difficult to guarantee are solved, the equipment utilization rate is greatly improved, the number of operators is reduced, and the production cost is greatly reduced.

The utility model relates to the technical field of nitriding furnaces, in particular to an inlet air cooling device of an ultra-deep well type nitriding furnace, which comprises a fan connected to the nitriding furnace and used for cooling inlet air, a butterfly valve for adjusting the inlet air rate is additionally arranged on the fan, and the pipeline joints of the butterfly valve, the nitriding furnace and the fan are all arranged to be of flange structures. A plurality of arc-shaped rings which can stretch out and draw back in the arc direction are installed on the connecting face through bolts, the arc-shaped rings form a closed ring body structure after being stretched, and the outer portion of the ring body structure is sleeved with a sealing ring used for sealing and isolation. The number of parts required for assembly is reduced, and meanwhile, a stable supporting effect on the sealing ring is achieved, so that all joint surfaces of the nitriding furnace are tighter, and air cooling is smooth and free of leakage; by additionally arranging the rotatable L-shaped limiting plate, additional locking and supporting effects are provided for the joint face, and the sealing performance of the flange joint is enhanced.

The present invention discloses an online monitoring method and platform for weld quality in a sheet metal welding process, and relates to the field of welding technology. The method comprises: determining a welding call sequence through welding sequence analysis, extracting joint surface parameters of a reference sheet metal part and a first sheet metal part, performing material change synchronization analysis, and generating a welding parameter sequence. In the process of using welding parameters to control the welding of a battery-type welder, quality monitoring is performed based on a weld image and weld defect nodes are output. Welding control and defect identification of the remaining sheet metal parts are performed according to the welding call sequence, and a weld defect node set is output. The technical problem that the prior art cannot monitor weld defects in a sheet metal welding process in real time and accurately is solved, and the weld quality in a sheet metal welding process is monitored in real time, and the position and type of weld defects are accurately located, so that welding defects can be discovered and corrected in a timely manner, and the welding quality can be ensured to meet the technical effect of standards.

The invention discloses a part joint degree thermal resistance testing method based on natural convection cooling, and relates to the technical field of thermal resistance testing. The problems that in the prior art, testing time is long, efficiency is low, drying cost is increased, and production efficiency is reduced are solved. Through test preparation, real-time monitoring and control, temperature difference calculation and repeated test verification, the thermal conductivity and the processing quality of the joint surface of the component can be quickly judged, the production efficiency is effectively improved, the test cost is reduced, the test conditions are accurately controlled, the thermal steady state is quickly achieved, the test time is remarkably shortened, the test efficiency is improved, and the test cost is reduced. Meanwhile, the drying cost is reduced, the production efficiency is improved, the stability and the reliability of a test result are ensured through repeated testing and verification, the processing quality of a component joint surface can be accurately evaluated, whether the joint process is qualified or not is quantitatively evaluated by establishing a standard temperature difference threshold value, and the reliability of the test result is enhanced.

The utility model relates to a tower fan and a base assembly thereof. The base assembly comprises a base plate and a connecting piece, the base plate comprises two bottom plates, the bottom plates are provided with joint faces, and the two bottom plates are attached to the joint faces in a face-to-face mode and buckled to form the base plate; a through hole is formed in the joint surface of the chassis in a penetrating manner; the connecting piece comprises a first connecting body and a second connecting body, and the first connecting body and the second connecting body are in threaded connection at the through hole and abut against the two opposite sides of the base plate respectively so as to jointly clamp the two base plates. Quick connection can be achieved by buckling the two bottom plates, and locking through a threaded connecting piece is not needed. The first connecting body and the second connecting body are quickly connected at the through holes in a threaded connection mode, and meanwhile the first connecting body and the second connecting body jointly clamp the two bottom plates on the two opposite sides of the base plate, so that the two bottom plates can be prevented from moving relatively, the connection reliability of the two bottom plates is improved, and the whole base plate has good supporting strength.

The utility model aims to provide a copper-aluminum composite material embedded with a plurality of narrow copper strips, which relates to the technical field of copper-aluminum compositing, and comprises an aluminum substrate and a plurality of narrow copper strips embedded in the aluminum substrate, and the plurality of narrow copper strips are parallel to one another; the first surfaces of the narrow copper strips are flush with the first surface of the aluminum substrate, and the second surfaces of the narrow copper strips are embedded into the aluminum substrate. Through the technical scheme, the composite material has the technical effects that (1) the composite material consists of the aluminum substrate and the plurality of narrow copper strips embedded into the aluminum substrate, the combination surfaces of the copper strips and the aluminum substrate are increased, the composite strength is increased, and the service life of the composite material is prolonged; cutting or stamping is easy; and (2) the conductivity of copper is superior to that of aluminum, and the aluminum is light in weight and low in cost. By embedding the narrow copper strip, the conductivity of the material is improved under the condition that the weight is not obviously increased; and (3) the connection problems of welding, lapping, riveting and the like of the copper-aluminum adapter in an electric power system and a circuit are solved, the stable connection of the adapter is realized, and the service life is prolonged.