1811results about How to "Closely connected" patented technology

The invention relates to the technical field of concrete preparation, in particular to fiber-reinforced building solid waste recycled aggregate concrete and a preparation method thereof.The preparation method comprises the following preparation steps that S1, recycled coarse aggregate, slag, fly ash and river sand are mixed and stirred according to the proportion, and a cement mixture is obtained; s2, calcining the cement mixture for 2-3 hours to obtain cement clinker; s3, cement clinker, modified fibers, modified graphene oxide and tetrasodium iminodisuccinate are mixed according to the proportion and then poured into a stirrer to be stirred for 5-6 min; and S4, adding water into the stirrer according to the proportion, continuously stirring for 6-10 minutes, and taking out to obtain the fiber-reinforced building solid waste recycled aggregate concrete. According to the invention, the polystyrene fiber and the concrete are connected more tightly by using the modified fiber, and the polystyrene fiber can be subjected to multiple reactions with components in the concrete in an alkaline environment of the concrete to form a stable network structure, so that mechanical indexes such as crack resistance and breaking strength of the concrete are improved.

The invention discloses a composite solid electrolyte diaphragm which comprises a bacterial cellulose membrane, fluorinated metal modified PEO electrolyte particles and functional group modified particles, and the fluorinated metal modified PEO electrolyte particles and the functional group modified particles are loaded in a three-dimensional network structure of the bacterial cellulose membrane. The functional group modified particles are functional group modified silicon dioxide particles and functional group modified LATP particles, the functional group modified silicon dioxide particles uniformly wrap the functional group modified LATP particles, and fluorinated metal of the fluorinated metal modified PEO electrolyte particles is combined with functional groups of the functional group modified particles through coordinate bonds. The invention also discloses a preparation method of the electrolyte diaphragm and a battery with the electrolyte diaphragm. The ionic conductivity of the electrolyte diaphragm is improved.

The invention discloses a high-stability supporting device for endoscopic surgery, which comprises a clamping structure, a lifting mechanism, a length adjusting mechanism, a horizontal rotating mechanism and a longitudinal rotating mechanism, and is characterized in that the clamping structure can be used for clamping and fixing endoscopic bodies with different sizes, and the lifting mechanism is used for preliminarily adjusting the heights of the endoscopic bodies; the length adjusting mechanism is arranged at the upper end of the lifting mechanism and used for adjusting the height of the endoscope body and the distance between the endoscope body and a patient, the horizontal rotating mechanism is used for adjusting the horizontal direction of the endoscope body, and the longitudinal rotating mechanism is used for adjusting the longitudinal angle of the endoscope body. According to the invention, all-directional supporting and adjusting functions can be provided for endoscopic surgery, so that the position and angle of the endoscope can be accurately adjusted to adapt to different surgical requirements.

A first wiring pipe and a second wiring pipe are detachably connected in a splicing mode, the inner side of the end face of the first wiring pipe is provided with an extrusion conical groove, and the end face of the second wiring pipe is provided with a rubber embedding and sealing block in a bonding mode at the position corresponding to the extrusion conical groove. According to the utility model, the end sleeves, the built-in annular air bags, the air injection pipes and the rubber sealing rings are arranged at the end parts of the first wiring pipe and the second wiring pipe, so that the built-in annular air bags can be conveniently injected with air after weak current line connection, and the built-in annular air bags are deformed after air injection; therefore, the rubber sealing ring on the inner side is driven to tightly abut against the outer side of the weak current circuit, so that the weak current circuit and the end parts of the first wiring pipe and the second wiring pipe are sealed, and the weak current wiring joints in the first wiring pipe and the second wiring pipe are protected. And external impurities are prevented from entering to influence the connection and use of the weak current line.

The invention discloses an efficient difunctional alkaline electrolysis water electrode which comprises a nickel net, an N deposition layer is deposited on the surface of the nickel net, and a NiFeW alloy layer is deposited on the surface of the N deposition layer. The invention further discloses a preparation method of the electrolyzed water electrode. The preparation method comprises the following steps: pre-treating the nickel net substrate; dissolving a nickel salt, a conductive salt and an additive in water to obtain a nickel electrodeposition solution; dissolving a nickel salt, an iron salt, a tungsten salt and an additive in water to obtain a nickel-iron-tungsten electro-deposition solution; and then the nickel net substrate is placed in a nickel electrodeposition solution to be subjected to constant-current deposition, a first electrode of an N deposition layer loaded on the nickel net substrate is obtained, the first electrode is placed in a nickel-iron-tungsten electrodeposition solution to be subjected to constant-current deposition, an N < iFeW > alloy layer loaded on the N deposition layer is obtained, and a finished electrode is obtained. The method has the advantages of low hydrogen evolution overpotential, low oxygen evolution overpotential, good stability, short-time deposition at room temperature, simplicity, easiness in control and low cost, and can be expanded to actual industrial application.

The invention belongs to the technical field of electric power information, and discloses a spectral clustering-based power distribution network medium-low voltage topology model generation method and related device, and the method comprises the steps: taking a transformer and a low-voltage meter box as nodes, and taking switch equipment as edges to construct a low-voltage topological graph; determining a connection weight coefficient of edges between the nodes according to the type and number of switches between the nodes, constructing an adjacent weight coefficient matrix of the low-voltage topological graph according to the connection weight coefficient, and constructing a degree matrix of the low-voltage topological graph according to the number of the edges connected with the nodes; and according to the adjacency weight coefficient matrix and the degree matrix of the low-voltage topological graph, clustering each node of the low-voltage topological graph by adopting a spectral clustering method to obtain a clustering result, and based on the low-voltage topological graph, dividing the nodes with the same category identifier into the same sub-graph to obtain a plurality of low-voltage topological sub-graphs and taking the low-voltage topological sub-graphs as low-voltage topological models. Not only is effective segmentation and simplification of the low-voltage topology in the power distribution network realized, but also powerful technical support is provided for intelligent management, rapid fault positioning and resource optimization configuration of the power grid.

The utility model relates to a cold-formed thin-walled steel fabricated structural system, and belongs to the technical field of structural engineering. Comprising combined joints, module main beams, module columns and module secondary beams. Column sleeves are arranged at the upper end and the lower end of the combined joint, a center joint is arranged between the column sleeves, horizontal partition plates are welded between the column sleeves and the center joint, a vertical end plate is welded to each side of the outer surface of the center joint, materials such as concrete can be poured into columns, and the bearing capacity and integrity of the combined joint are improved. The connecting sleeve has the beneficial effects and advantages that the connecting sleeve is small in size, light in weight and convenient to transport and hoist, the machining time is greatly shortened, the machining quality is guaranteed, modular design, factory production and specialized installation are integrally achieved through standardized modular production of components and the connecting sleeve, field assembly is simple and efficient, and the production efficiency is improved. The purposes of reducing labor, shortening the construction period and saving cost are achieved, and industrialization development of the fabricated building is promoted.

The invention discloses an automatic processing device for diesel generator processing and a processing method, an intermittent rotating seat is rotatably mounted above a base, a composition jig is placed above the intermittent rotating seat, the composition jig is located between an inner supporting plate and an outer pressing plate, a plurality of stator cores are placed above the composition jig in an overlapping manner, and the stator cores are located between the inner supporting plate and the outer pressing plate. The inner side and the outer side of the stator core abut against the inner supporting plate and the outer pressing plate correspondingly, a lifting base is rotationally installed at the bottom end of a push rod of the hydraulic cylinder, a pressure maintaining plate is arranged below the lifting base, and two welding mechanisms are arranged on the upper portion of the base in a bilateral symmetry mode. The intermittent rotating seat is provided with the pressure maintaining mechanism, the stator iron core is stacked between the inner supporting plate and the outer pressing plate in the pressure maintaining mechanism, the stator iron core can be supported and positioned, the welding precision is improved, the inner supporting plate and the outer pressing plate can be far away from each other, the built-in space is large, and the stator iron core can be conveniently placed and taken out.

The invention discloses a preparation method of a continuous graphene nanofiber bundle, and relates to the technical field of graphene fiber materials. The preparation method comprises the following steps: preparing and preparing a graphene oxide nanobelt solution, and adding a plasticizer to obtain a spinning solution; injecting the spinning solution into an electrostatic spinning device, performing near-field electrostatic spinning and air curing, and performing curing forming in a coagulating bath to obtain basic graphene oxide fibers; a plurality of fibers are assembled into nanofiber multifilaments in a coagulating bath, and then the nanofiber multifilaments enter a subsequent multi-stage combined drafting process to prepare a GO fiber aggregate; the GO fiber aggregate is immersed in a Lys-Dopa solution for a reaction, and finally the GO fiber aggregate is collected through a twisting process; reducing the collected GO fibers with hydroiodic acid to obtain reduced graphene fibers, and then performing high-temperature graphitization treatment to obtain a graphene nanofiber bundle product; the graphene fiber preparation process is improved from multiple aspects of raw material preparation, spinning and drafting, Lys-Dopa bath, twisting and the like, a new mechanical property improvement scheme is provided, and development of the graphene fiber field in the future is promoted.

The invention relates to the technical field of flange machining, in particular to a positioning tool based on variable-diameter flange machining. The concentric locking unit is arranged on the inner side of the machining frame and connected with the machining frame; the self-adaptive welding unit is arranged on the outer side of the concentric locking unit and connected with the machining frame; wherein the concentric locking unit comprises a rotary positioning assembly, a clamping and limiting assembly, a synchronous energy supply assembly and an automatic rotating assembly, the concentric locking unit is arranged and matched with the self-adaptive welding unit, locking and limiting of the small flange, the conical pipe and the large flange can be completed at a time, the small flange, the conical pipe and the large flange are concentric, and the automatic rotating assembly is arranged. And the small flange is tightly connected with the conical pipe, and the large flange is tightly connected with the conical pipe, so that the small flange, the conical pipe and the large flange synchronously rotate, and welding of the small flange and the conical pipe and welding of the large flange and the conical pipe are completed at a time.

The invention discloses a high barrier antibacterial flexible packaging material and a preparation method thereof, belonging to the technical field of flexible packaging composite materials. The flexible packaging material is composed of an outer layer, a barrier antibacterial layer and an inner heat-sealing layer from the outside to the inside; wherein the raw materials of the barrier antibacterial layer include 85 to 95 parts by weight of EVOH resin and 5 to 15 parts of an antibacterial modifier; the antibacterial modifier is an amine organic molecular cage composite nanosilver. The EVOH resin provides good barrier properties for the material, and the nanosilver in the amine organic molecular cage composite nanosilver can slowly release silver ions, giving the flexible packaging material certain antibacterial properties, and the composite of the amine organic molecular cage can improve the dispersibility of the nanosilver in the matrix resin on the one hand, and help improve the water absorption of the material on the other hand, reduce the influence of moisture on the EVOH resin, and effectively solve the problem of decreased barrier properties of the EVOH resin in a humid environment and increased probability of microbial contamination.

The invention discloses a material sorting system and method. According to the technical scheme, the material sorting system and method comprise a feeding unit, first-stage sorting equipment, second-stage sorting equipment, a first conveying channel, a plurality of storage bins, a conveying pipeline and a reversing assembly. Through multi-stage cooperation of the feeding unit, the first-stage sorting equipment, the second-stage sorting equipment and the like, plastic bottles and other plastic are sorted out through the first-stage sorting equipment, then the plastic bottles and the other plastic are further subdivided through the second-stage sorting equipment, and the fine and efficient material sorting process is achieved; in the second-stage sorting equipment, a conveying channel is divided into two conveying areas through a first partition plate, the output end is further divided into four output channels through a second partition plate and a splitter plate, the equipment which can only sort two kinds of objects originally can sort four kinds of materials, the sorting type and efficiency are improved, and the sorting efficiency is improved. And sorting of the plastics in all the subareas can be achieved only by arranging sorting objects.

The invention relates to the technical field of reactor thermal hydraulics and safety, in particular to a long electric heating plate heat insulation structure and a heat transfer simulation experiment device with the long electric heating plate heat insulation structure. The long electric heating plate heat insulation structure comprises a heat insulation base, a heating plate and a cementing layer. The heat insulation base is configured to be a ceramic resin plate, and a sinking groove is formed in one plate face of the heat insulation base. The heated plate is arranged in the sinking groove so that the plate face of the heated plate can be flush with the plate face of the heat insulation base, and the surface, corresponding to the groove wall and the groove bottom of the sinking groove, of the heated plate is provided with a micropore aluminum oxide ceramic layer which is subjected to nanocrystallization treatment through an active coupling agent. And the cementing layer is arranged between the heated plate and the heat insulation base in a high-temperature vacuum pressure environment. According to the heat transfer simulation experiment device, it can be ensured that the heated plate has good single-side heat dissipation performance under the temperature working condition that the surface of the dispersion type fuel element is blistered, the experiment safety during operation of the heat transfer simulation experiment device can be ensured, and the accuracy of a measurement result in a simulation experiment can be ensured.

The invention discloses a NiCrAl structured catalyst as well as a preparation method and an application method thereof. The catalyst contains NiCrAl layered double hydroxides (NiCrAl-LDHs) and a metal substrate, the NiCrAl-LDHs vertically grow on the surface of the metal substrate in situ, nickel ions, chromium ions and aluminum ions in the NiCrAl-LDHs structure come from the metal substrate, and the preparation method comprises the following steps: dissolving urea in water to prepare a urea aqueous solution; and putting the metal substrate into the urea aqueous solution, and carrying out hydrothermal reaction to obtain the composite material. The application method of the catalyst comprises the following steps: introducing current into the catalyst in a reaction atmosphere, and driving the catalytic reaction by using Joule heat generated by the current. The NiCrAl structured catalyst provided by the invention has the characteristics of simple preparation method, less chemical reagent dosage, excellent catalytic performance, easiness in batch production and the like, and is very suitable for application of electrothermal catalysis.

The invention discloses yttrium oxide-aluminum oxide transition layer composite ceramic and a preparation method and application thereof.The preparation method comprises the steps that quantitative aluminum oxide powder, transition mixed powder and yttrium oxide powder are sequentially laid in a forming mold of a cold isostatic pressing machine from bottom to top, and then the powder raw materials in the forming mold are evenly pressurized through the cold isostatic pressing technology; a formed ceramic green body is obtained; the formed ceramic green body is machined into a designed shape and then sintered, the composite ceramic with the aluminum oxide part as an aluminum oxide base material, the transition mixed powder as a transition layer and the yttrium oxide part as a coating is obtained, the transition layer can reduce a gap of a bonding interface of yttrium oxide and aluminum oxide, and the interface is seamlessly connected and is more compact; in addition, aluminum oxide particles and yttrium oxide powder particles in the transition layer are uniformly mixed and embedded with each other, so that the mechanical locking between materials is obviously improved, and the binding force is stronger; the problems that in the prior art, an yttrium oxide etching-resistant protective coating is poor in binding force and prone to peeling off are solved.

The invention discloses a control cabinet wiring detection device, and belongs to the technical field of detection devices. The device comprises a body and two groups of detection cylinders, moving cylinders are sleeved with the two groups of detection cylinders in an up-down sliding manner, the lower sides of the moving cylinders are fixedly connected with moving frames, the outer sides of the detection cylinders are fixedly connected with bottom plates through arc-shaped rods, and positioning assemblies used for adjusting and fixing the positions of the moving cylinders are installed in the detection cylinders. The positioning assembly comprises a positioning rod, a fixing plate, an arc-shaped plate and a first spring, and the positioning rod is slidably sleeved with the detection cylinder. When a connecting line in the control cabinet needs to be detected, the movable frame and the bottom plate are moved to the two ends of the detected connecting line, the voltage of the connecting line is detected through the body, in the process, under the action of the compressed first spring, the connecting line, the movable frame and the bottom plate are connected more tightly, and the detection accuracy is improved. The detection cylinder does not need to be held by hands all the time, and the workload is reduced.

The invention provides an automatic production stamping method for automobile warm air heat exchanger accessories with reinforcing ribs, which belongs to the field of automobile processing and comprises the steps of die debugging, processing parameter setting, sensor mounting, processing flow execution, processing position control, processing quality control, finished product inspection and processing parameter optimization. Important machining procedures such as notching, reinforcing rib stamping, bending, cutting-off and material returning are continuously carried out, that is, multiple procedures are completed in one die, high integration of the machining procedures is achieved, all the procedures can be closely connected, transferring and repositioning of semi-finished products among all the procedures are reduced, and the production efficiency is improved. And meanwhile, the die replacement and debugging time is shortened, the production period is shortened, the optical sensor used for monitoring the position deviation of the material belt and the piezoresistive flexible sensor used for monitoring the pressure distribution of the material belt are additionally arranged, accurate positioning of the material belt in the stamping process is achieved, and the stability of the stamping quality is ensured.

The invention relates to an aluminum alloy cable connector, and belongs to the technical field of cable installation. The aluminum alloy cable connector comprises a crimping pipe, two insulating threaded pipes and two threaded sleeves, the two insulating threaded pipes are fixedly connected to the two ends of the crimping pipe respectively, and the two threaded sleeves are in threaded connection to the opposite ends of the two insulating threaded pipes respectively; the sealing device is arranged on the surface of the crimping pipe in a sleeving manner; a user only needs to rotate the threaded sleeve to perform internal and external sealing operation at the same time, and in the process, the first internal sealing mechanism not only can perform double sealing on a gap between the aluminum alloy cable and the insulating threaded pipe, but also can firmly bond the aluminum alloy cable and the insulating threaded pipe together, so that the sealing effect is good. Therefore, the aluminum alloy cable protection layer and the insulation threaded pipe are connected more tightly, and the overall connection strength of the connector is improved.

The invention relates to the technical field of polymer materials, and discloses a polymer antibacterial material and a preparation method thereof.The polymer antibacterial material is obtained by adding polyethylene, maleic anhydride grafted polyethylene and quaternary ammonium salt modified polyurethane into a twin-screw extruder, blending and extruding. In the extrusion process, a terminal hydroxyl group in quaternary ammonium salt modified polyurethane reacts with an anhydride group in maleic anhydride grafted polyethylene, so that the compatibility between the quaternary ammonium salt modified polyurethane and polyethylene is increased, and meanwhile, crosslinking is generated, so that the quaternary ammonium salt modified polyurethane and the maleic anhydride grafted polyethylene are connected more tightly, and the mechanical properties of the quaternary ammonium salt modified polyurethane and the maleic anhydride grafted polyethylene are improved. A quaternary ammonium salt group and a quaternary phosphonium salt group in the quaternary ammonium salt modified polyurethane have good antibacterial effects and have synergistic antibacterial effects. A silicon element, a phosphorus element and a triazine group in the quaternary ammonium salt modified polyurethane jointly form an antibacterial system, and a synergistic antibacterial effect is achieved.

The invention discloses an industrial robot quick disassembly type multifunctional end tool switching frame which comprises an industrial robot body arranged on a machine table and a disassembly and assembly switching frame fixedly connected to the other end of the industrial robot body, and a clamp is movably installed on the right side of the disassembly and assembly switching frame. The device is simple in structure, the clamp at the tail end of the industrial robot can be quickly disassembled, assembled and switched conveniently, positioning of the first positioning groove by the first positioning block and positioning of the second positioning groove by the second positioning block can be achieved only through work of one driving motor, it can be ensured that the clamp is more stable after being switched and installed, and the working efficiency is improved. The industrial robot has the advantages that follow-up stable operation of the robot is guaranteed, switching efficiency is high, and the problem that tools such as a wrench and a screwdriver are needed when a tail end clamp of an existing industrial robot is switched, so that a large amount of time and labor are consumed when the clamp is dismounted and switched is solved; and the existing use requirements of efficiently, flexibly and quickly switching different clamps are met.

The invention relates to the technical field of cables, and provides a waterproof cable for photovoltaic power generation, which comprises a cable body, a plurality of cable conductors are arranged in the cable body, the cable conductors are coated with insulating layers, the plurality of insulating layers are coated with a filling layer, and the filling layer is sequentially coated with a belting layer, a first waterproof sheath and a shielding layer. The cable further comprises a second waterproof sheath, a butt-joint conductive assembly, a butt-joint protection assembly and an end waterproof assembly, the second waterproof sheath wraps the shielding layer, the butt-joint conductive assembly is installed between the cable conductors in the two cable bodies, the butt-joint protection assembly is installed outside the butt-joint protection assembly, and the end waterproof assembly is installed between the butt-joint conductive assembly and the butt-joint protection assembly. According to the technical scheme, the problem that in the prior art, when a photovoltaic cable is laid outdoors, due to the fact that a cable head is not sealed tightly, a conductive part of the cable makes contact with water, and the cable is prone to open circuit and electric leakage is solved.

A labor-saving and silent push-rebound opening and closing device for furniture includes a rebound bracket, a push element, and a push element. The rebound bracket is provided with a circular groove, the push element is provided with a sliding shaft portion, the push element elastically telescopically limits the sliding on the push element and / or the rebound bracket, and acts and drives the sliding shaft portion to position and / or slide along the trajectory of the circular groove in a sequential direction when sliding, and also includes a lever assembly, the lever assembly is provided with a lever action portion, the push element is provided with a pushing action portion, and the circular groove is provided with at least an upper limit sliding area, a conversion area, and a front stop area; when the sliding shaft portion slides on the upper limit sliding area, it acts and drives the pressing element and the pushing element to slide out of the rebound bracket, the sliding shaft portion slides to a certain position on the upper limit sliding area and separates from the pressing element, and the pushing element interacts with the lever action portion through the pushing action portion when the sliding shaft portion and the pressing element separate. The present invention has strong practicality through the improvement of the above structure.

The invention relates to the technical field of concrete compacting agents, and provides an internal doping type self-repairing concrete compacting agent which comprises the following components in parts by weight: 10-15 parts of a water-soluble polymer, 12-18 parts of an expanding agent, 1-3 parts of a shrinkage reducing agent, 2-8 parts of organic fibers, 10-15 parts of a modifier and 30-50 parts of a diluent, the modifier comprises bauxite, diatomite and forsterite powder in a mass ratio of 1: 1: 8-8: 1: 1. According to the technical scheme, the problem that the concrete compacting agent in the related technology is poor in improvement of the anti-permeability performance of concrete is solved.

The invention provides a concrete lining channel frost heaving strain experiment device, and relates to the technical field of freeze-thaw cycle test devices, the concrete lining channel frost heaving strain experiment device comprises a frost heaving body accommodating bin, the axis of the frost heaving body accommodating bin is uniformly provided with a plurality of temperature sensors from bottom to top at intervals; a frost heaving soil layer is filled in a frost heaving body accommodating bin below the simulated lining, and the axial displacement monitoring device is used for detecting the axial displacement of the simulated lining; freeze-thaw media are pumped into the medium containing bins, and the freeze-thaw media exchange heat with the frost heaving body containing bins above so as to promote frost heaving change of the frost heaving soil layer. A traditional prefabricated concrete lining structure is replaced with the simulation lining, the simulation lining can be repeatedly used, meanwhile, concrete of different grades and strengths can be further simulated, consumption of raw materials is greatly reduced, and the method is rapid, efficient, energy-saving and environmentally friendly; and meanwhile, the existing scattered structures are integrated, so that the occupied space is reduced.

The utility model belongs to the technical field of battery packs, and provides a battery pack box body connecting and sealing integrated structure which comprises a battery pack box body, and the battery pack box body comprises a bottom protection plate, a liquid cooling plate and a box body frame; the box body frame and the liquid cooling plate are riveted and locked through a sealing rivet nut; and the bottom protection plate is connected with the sealing rivet nuts through bolts. According to the utility model, the bottom protection plate, the liquid cooling plate and the box body frame in the battery pack box body are tightly connected by adopting the bolts and the sealing rivet nuts, so that reliable connection and sealing performance are provided, meanwhile, the bolts and the sealing rivet nuts can be used on a large scale, are uniform in model and are beneficial to reducing the cost, and the bolts are matched with the sealing rivet nuts, so that the sealing effect is good. In the assembling process, the liquid cooling plate and the box body frame are riveted and locked through the specific sealing rivet nuts, a box body connecting and sealing integrated structure is formed, compared with the scheme that hot melting self-tapping screws and glue are added or rivet nuts are connected in a screwed mode and a sealing ring is added, the process is higher in efficiency, and the cost is further reduced.

The invention relates to a silicon-carbon composite material, a preparation method and application thereof, and a battery. The silicon-carbon composite material comprises: a porous carbon matrix; the metal coating is positioned on the hole wall of the porous carbon substrate; the silicon alloy particles are positioned on the surface of the metal coating; the amorphous silicon particles grow along the epitaxy of the silicon alloy particles; and a carbon coating layer, wherein the carbon coating layer is located at the outer layer. The silicon-carbon composite material disclosed by the invention has excellent conductivity and structural stability, and the battery adopting the silicon-carbon composite material can realize high mass specific capacity and excellent high-temperature and low-temperature cycling stability.

The invention discloses a BIM-based building construction material replacement cost early warning method and system, and the method comprises the following operation steps: collecting the construction information of building construction, and constructing a BIM model through the collection of the construction information of building construction; component geometric features of building components are extracted from the BIM model, and a geometric feature constraint model is preliminarily constructed according to the component geometric features; analyzing the dynamic index of the building component according to the component geometric features, and updating the geometric feature constraint model to obtain a geometric feature model; collecting actual component data of a real building construction site, inputting the actual component data into the geometric feature model, and calculating the material replacement cost of the actual component data of the real building construction site; and early warning is performed according to the material replacement cost of the actual component data of the real building construction site.

The invention relates to the technical field of welding, in particular to an automobile anti-collision beam robot welding device and welding system.The automobile anti-collision beam robot welding device comprises a rotary table, and the top of the rotary table is provided with two rotary ends which are oppositely arranged and can synchronously rotate; each rotary end is fixedly provided with one lifting assembly, and each lifting assembly is fixedly provided with one first clamp and one second clamp. The top of the second clamp is used for clamping and fixing a sound absorption box; the lifting assembly is used for driving the second clamp to ascend so that the top face of the sound absorption box can abut against the bottom face of the arch-shaped anti-collision beam. According to the welding device, the two first clamps of the rotary table are used for clamping and fixing one end of the arch-shaped anti-collision beam, the tops of the second clamps are used for clamping and fixing the sound absorption box, and the top face of the sound absorption box abuts against the bottom face of the arch-shaped anti-collision beam through the lifting assembly, so that a welding channel of the welding device is wide, obstacles are few, and the welding efficiency is improved. And the design difficulty of a welding gun moving path is reduced.

The present application belongs to the technical field of air spring assemblies, and in particular relates to an air spring assembly with adjustable stiffness based on a dual stiffness valve and multiple chambers. The present application is divided into three independent air chambers by two independently controlled solenoid valves and a matching structure. The first solenoid valve and the second solenoid valve are installed in these components and form a channel for controlling the flow of gas. The air chambers are connected and disconnected by independently controlling the power on and off of the solenoid valves, thereby changing the number of air chambers opened in the air spring assembly, thereby changing the actual use volume of the air spring assembly, so that the air spring assembly has multiple working states and realizes the stiffness adjustment function.

The invention belongs to the field of constructional engineering, and particularly relates to a connecting joint of a prefabricated reinforced concrete column and a prestressed steel reinforced concrete beam and a construction technology. The structure for connecting the joint by adopting the pi-shaped connecting piece is as follows: one end of the prestressed steel reinforced concrete beam is connected with the pi-shaped connecting piece of the prefabricated reinforced concrete column, a concrete layer is arranged at the top of the section steel at the end, the bottom of the section steel is exposed, and a vertically through bolt channel is arranged along the vertical direction; and one end of the prefabricated prestressed steel reinforced concrete beam extends between the upper web plate and the lower web plate of the pi-shaped connecting piece and is in close contact fit with the upper web plate and the lower web plate. According to the structure of the overhanging short beam-flange clamping sleeve connecting joint, an overhanging short beam is arranged at the joint of a prefabricated reinforced concrete column and a prestressed steel reinforced concrete beam, and the prefabricated reinforced concrete column is connected with the prestressed steel reinforced concrete beam through the overhanging short beam on the prefabricated reinforced concrete column; and the prestressed steel reinforced concrete beam is clamped on the flange clamping sleeve at the end part of the overhanging short beam through the flange plate at the end part.