64 results about "Steel square" patented technology

A multi-purpose framer's speed square in the form of a right triangle comprising a top plate with a T-shaped edge and a series of etched top plate lines including framing top plate call outs, a notched front edge having a plurality of notches spaced along the length in ¼″ increments, ruler etching callouts, and lumber width callouts denoting lumber sizes, and a hypotenuse edge having etched top plate lines, common rafter window plumb cut outs and a hip / valley section disposed above the hypotenuse edge having etched degrees and hip / valley roof rafter plumb cuts.

A convenient lattice type pile pulling device comprises a steel square ground breaking module, a lattice column, a lattice column connecting unit and a lattice column extending frame which are sequentially connected from bottom to top, the lattice column extending frame is connected with a vibration head of a crawler crane, and the lower portion of the steel square ground breaking module is a square ground breaking head of a rectangular hollow structure. An inclined plate is arranged on the front face of the upper portion of the steel square ground breaking module to form a variable cross-section, the minimum position of the variable cross-section is connected with the latticed column, and the minimum cross-section of the variable cross-section is the same as the cross-section of the latticed column. Inclined sliding grooves are formed in the left side face and the right side face of the square ground breaking head, the two inclined sliding grooves are sleeved with the steel bottom-carrying pile pulling sliding bolt in an up-down sliding mode, the highest positions of the inclined sliding grooves are close to the front face of the square ground breaking head, namely the maximum section position of the inclined plate, and the lowest positions of the inclined sliding grooves are located in the middle of the square ground breaking head. The structure is easy and convenient to construct, high in construction speed, low in cost and small in influence on the environment.

The utility model provides a steel rectangular tube fireproof wall body structure, which relates to the technical field of fireproof wall devices, and comprises a steel rectangular tube frame and a plurality of fireproof plates, the plurality of fireproof plates are arranged in the steel rectangular tube frame, the thickness of the fireproof plates is greater than the diameter of the steel rectangular tube frame, and the fireproof plates are arranged in the steel rectangular tube frame. The steel rectangular pipe fireproof wall structure comprises a steel rectangular pipe frame, a fireproof plate and fireproof cotton, positioning steel bars are inserted into the inner side of the steel rectangular pipe frame in a penetrating mode, the other ends, penetrating through the steel rectangular pipe frame, of the positioning steel bars are inserted into the fireproof plate, and self-adhesion gridding cloth is connected to the outer surface of the fireproof cotton. Through splicing of the fireproof plates, construction is convenient, the construction period is greatly shortened, the exposed position of the steel rectangular pipe frame is shielded through the fireproof cotton, a fire source is prevented from making direct contact with the steel rectangular pipe frame when a fire happens, and the fireproof grade of the steel rectangular pipe frame is improved.

The invention belongs to the technical field of metallurgy, and particularly relates to low-crack-expansibility high-speed steel casting powder and a preparation method thereof.The casting powder is composed of, by weight, 35%-40% of silicon dioxide, 26%-29% of graphite, 12%-15% of aluminum oxide, 11%-15% of calcium oxide, 2%-4% of calcium fluoride, 3%-5% of magnesium oxide and 2%-5% of sodium oxide. According to the casting powder, by precisely adjusting the proportion of the fluxing agents such as SiO, CaO, CaF and NaO to the key components, the optimized CaO / SiO ratio and a proper amount of AlO, the technical problem that in the casting process of a high-speed steel square billet, surface defects are likely to be formed and expand into macroscopic cracks in the follow-up forging link, and then the product yield and economic benefits are seriously affected is solved.

The application discloses a flexible assembly jig for a forklift mast and a mast assembly fixing method. When the flexible assembly jig is used, a pin hole positioning shaft is used in cooperation with a low positioning seat to fix a mast roller installation hole; the pin hole positioning shaft is used in cooperation with a high positioning seat and a spacer to fix an outer mast frame installation hole; a positioning block and a limiting block are used to form a mast slide way fixing assembly to position a mast roller slide way; a threaded hole positioning shaft, a positioning shaft installation block and a positioning angle ruler are used to form a threaded hole positioning assembly to fix an outer mast oil cylinder installation hole and a chain installation hole; a limiting block and a positioning angle ruler are used to form a mast lower cross beam fixing block to support a mast lower cross beam; and the limiting block is used to limit the mast end portion. The application has high flexibility and strong universality, can improve the positioning accuracy and positioning efficiency of the mast workpiece, and ensures that the workpiece is firmly positioned during welding.

The utility model discloses a steel square tube connecting and positioning structure which comprises a main steel square tube, the main steel square tube is vertically arranged, a first concave base is fixedly connected to the center of the outer wall of the main steel square tube, grooves are formed in the four faces of the corners of the top of the first concave base, the bottom of a steel sleeve is buckled with the grooves of the first concave base through protrusions, and the steel sleeve is fixedly connected with the main steel square tube. The four sides of the side wall of the steel sleeve are provided with square grooves, the square grooves of the steel sleeve are buckled with side steel square pipes, the side walls of the side steel square pipes are sleeved with first bolts, and the first bolts penetrate through the steel sleeve blocks to be in threaded connection with the screw holes of the main steel square pipe. A supporting system of a foundation pit is achieved, meanwhile, positioning work of installation is completed, the whole is more stable when connection is reinforced, the shape is not greatly changed in production, only punching work is added, a stable inner supporting structure is formed in construction, and the structure has the independent disassembly function and can be assembled according to the position of the foundation pit; meanwhile, the influence of mounting and dismounting of the inner support on foundation pit construction is reduced.

The utility model relates to the technical field of square tubes, in particular to a stainless steel square tube easy to cut, which comprises a square tube and a gasket component, the gasket component is arranged on the outer surface of the square tube, a dovetail groove is arranged on the outer surface of the square tube, and grooves are equidistantly arranged on two sides of the dovetail groove on the outer surface of the square tube. The gasket assembly comprises a first gasket and a second gasket, and the first gasket and the second gasket are connected with the dovetail groove through clamping grooves. By additionally arranging the auxiliary cutting structure and forming different grooves in the outer surface, the effect of auxiliary limiting is achieved, the stability of the square pipe in the cutting machining process is improved, pressure borne by extrusion can be relieved, deformation is avoided, and therefore the using effect is improved.

The utility model discloses a kind of turnover rapid splicing steel structure tower crane foundation templates, the foundation template includes: template body, the template body includes inner side and outer side, the template body can be welded along its length direction between, it can also be in first placement state or second placement state and be fixed;Wherein, first placement state is the inner side between the template body is placed at right angle angle, second placement state is the outer side between the template body is placed at right angle angle, to make template body can be connected and form a rectangular mold cavity, the rectangular mold cavity is used for pouring foundation;Foundation template further includes: inner bracing, both ends of the inner bracing are installed in the inner side of the template body;Steel square tube main keel is transversely installed in the outer side of the template body, for connecting template body in the first placement state.

The utility model discloses a building outer wall capable of preventing plastering from cracking, and relates to the field of building construction. The device comprises a thick ALC plate, a window opening is formed in the center of the thick ALC plate, a steel square tube structure, an ALC outer batten and a waterproof rubber pad are installed on the window opening, the steel square tube structure is fixedly installed on the wall of the window opening, the steel square tube structure is installed close to the indoor side and used for supporting and reinforcing the window opening, the ALC outer batten is fixedly connected to the outer end of the steel square tube structure, the ALC outer batten is installed close to the outdoor side and used for supporting and reinforcing the window opening, and the waterproof rubber pad is fixedly connected to the outer end of the ALC outer batten. The waterproof rubber pad is used for preventing the steel structure from being exposed in the outdoor environment and is arranged between the steel square tube structure and the ALC outer batten. The large window opening is reinforced through the steel structure square tube, the weight of the large window is effectively borne, the steel structure cannot be exposed outdoors through the ALC outer batten, the problem that outer wall plastering cracks due to the fact that the steel structure changes along with the external temperature is solved, and outdoor water is prevented from invading the steel structure to damage the steel structure through the waterproof rubber pad.

The application provides an austenitic 304 stainless steel square billet continuous casting mold flux and application thereof, and relates to the technical field of metallurgical auxiliary materials. The chemical components of the austenitic 304 stainless steel square billet continuous casting mold flux include: SiO2 29.0%-35.0%, CaO 33.0%-39%, Li2O 0.2%-0.6%, Al2O3 3.5%-7.5%, Na2O 4.6%-8.6%, F ‑ 6.0%-8.5%, MnO 2.0%-4.0%, Fe2O3≤2.0%, B2O3 0.18-1.0%, Cr2N 0.5%-0.8%, free carbon 0.1-0.2%. The chemical components of the mold flux only contain 0.1-0.2% of free carbon, and thus the generation rate of stainless steel black bands can be effectively reduced in the continuous casting process of the austenitic 304 stainless steel square billet.

The invention discloses a steel-concrete structure building fold line curtain wall fixing structure and a construction method thereof. The steel-concrete structure building fold line curtain wall fixing structure comprises a steel beam, a steel square box, a plurality of anchor bars, a bracket, a concave point adapter, a curtain wall convex point stand column, a curtain wall concave point stand column, a floor bearing plate and concrete. The anchor bars are connected to the steel square box. The bracket is connected to the steel square box and the steel beam and located on the side, away from the anchor bar, of the steel beam. The concave point adapter is connected to the steel beam, and the extension length of the concave point adapter is smaller than that of the bracket in the direction perpendicular to the steel beam. The curtain wall convex point stand column is connected to the end of the bracket, the curtain wall concave point stand column is connected to the concave point adapter, and the floor support plate is located on the side, provided with the anchor bars, of the steel beam. The concrete is poured on the floor support plate, covers the anchor bars and is fixedly connected with the steel square box. In the invention, the structures such as the steel beam, the steel square box, the anchor bar, the bracket and the concave point adapter can be assembled and formed in a factory in advance, so that the assembly precision is improved, the operation complexity of site construction is reduced, and the assembly efficiency is obviously improved.

The invention relates to the technical field of magnetic performance detection of silicon steel square rings, in particular to a full-automatic box-type annealing furnace for stress relief annealing of a silicon steel square ring sample and a control method of the full-automatic box-type annealing furnace. Through the reasonable structural design of the full-automatic feeding and discharging and furnace door switch locking mechanism and the high-temperature-resistant square ring sample tray, full-automatic loading, annealing and unloading of silicon steel square ring samples can be achieved, and the production efficiency is greatly improved; according to the invention, a double-zone heating temperature control system is matched with a circulating fan and a tray ventilation hole, so that each sample can be uniformly heated, and the annealing quality consistency is ensured; meanwhile, the gas heating device is linked with the in-furnace heating and cooling control, so that the temperature fluctuation caused by nitrogen introduction can be avoided, and the smoothness of an annealing curve is further improved; according to the atmosphere control system, through dual monitoring of pressure and oxygen content, linkage adjustment of the nitrogen solenoid valve and combination of a furnace door sealing structure, air mixing and sample oxidation can be effectively prevented, and the stability of atmosphere control in the furnace is ensured.

The application discloses a kind of special equipment for welding large thick-wall angle steel square, it is related to the technical field of angle steel square welding, including workbench, inner welding assembly and outer welding assembly, the lower mounting bracket is fixed in the upper middle part of the workbench, and the lower mounting bracket side is equipped with lower telescopic rod, the upper of the lower telescopic rod is fixed with lower locating block, and lower locating block is located in the upper of the inner side of lower mounting bracket, the inner welding assembly is installed in the upper of the inner side of lower locating block, the upper of the workbench is symmetrically equipped with displacement component in front and back two sides, and the upper of displacement component is equipped with outer welding assembly.The special equipment for welding large thick-wall angle steel square.Outer welding assembly cooperates inner welding assembly to be able to simultaneously carry out welding operation to the inner and outer sides of two weld seams of angle steel square, meet the requirement of weld root full penetration and double-sided forming, production efficiency is higher, it is advantageous to batch completion welding task.

This utility model discloses a hole-opening device for stainless steel square tubes, including a base. A movable frame that moves back and forth is mounted on the top of the base. A left-right movable support is mounted on the top of the front of the movable frame. A drive motor that slides up and down is mounted on the front of the support. A drill bit is fixedly connected to the output shaft of the drive motor. The square tube is placed on the lower limit seat connected to the second limiting plate. With manual assistance, the first limiting plate is moved by an electric telescopic rod, causing the lower limit seat connected to the first limiting plate to move. This lower limit seat supports the bottom of the tube, and the first and second limiting plates limit the front and rear ends of the tube. Simultaneously, by moving the upper limiting structure as needed to limit the upper end of the square tube, and then using the drive motor to adjust the position, the device can be stabilized during hole opening, thus preventing deviation during the opening process.

The utility model relates to the technical field of shuttle car tire hubs, in particular to a mining area shuttle car tire hub protection structure which comprises a shuttle car hub, the outer side of the shuttle car hub is connected with a plurality of groups of bolts, the plurality of groups of bolts are linearly distributed on the outer side of the shuttle car hub, and the outer wall of each bolt is in threaded connection with a nut. Two sets of steel square frames are welded to the side face of the shuttle car hub and are symmetrically distributed on the side face of the shuttle car hub, three sets of sliding holes are formed in the ends of the steel square frames, limiting insertion rods are slidably connected into the three sets of sliding holes correspondingly, and the three sets of limiting insertion rods are jointly welded into a movable plate. An oval fixing block is welded to one end of the limiting insertion rod. According to the utility model, through the arrangement of the protective steel cover, the protective steel cover can protect the plurality of groups of bolts, so that the plurality of groups of bolts cannot be deformed or fractured due to external force impact, the effect of protecting the plurality of groups of bolts is achieved, and the plurality of groups of bolts are convenient to disassemble.

The utility model discloses a diagonal cutting device for a stainless steel welded square tube, and relates to the technical field of stainless steel square tubes. The diagonal cutting device for the stainless steel welded square tube comprises a bottom plate, and a fixing mechanism and a cutting mechanism are arranged above the bottom plate; the cutting mechanism is located above the fixing mechanism. The fixing mechanism comprises a fixing part and a bearing part; the fixing part comprises a double-shaft threaded rod and two clamping frames, the bearing part comprises a bearing plate, and the technical effects are that a control motor in the fixing mechanism drives the double-shaft threaded rod to rotate so that the two clamping frames can rapidly and stably clamp and fix the stainless steel welded steel pipe, and a damper and a spring below the bearing plate can adapt to steel pipes of different models; it is guaranteed that the top face of the bearing plate makes contact with the steel pipe all the time, the stability of the square pipe in the cutting process is guaranteed, the cutting precision and quality are improved, the application range of the device is widened, the working difficulty and labor intensity of operators are reduced, and the working efficiency is effectively improved.

The present application relates to a kind of aluminum alloy fire-resistant window reinforcing structure, the upper end surface of the inner frame and the upper end surface of the outer frame are provided with upper reinforcing plate, the bottom surface of the inner frame and the bottom surface of the outer frame are provided with lower reinforcing plate.In the present application, by the cooperation of the above structures, the inner frame, the connecting piece and the outer frame are wrapped as a whole, forming an external reinforcing support structure.When a fire occurs, even if the inner frame and the outer frame soften, the stainless steel square tube, the stainless steel self-tapping screw, the stainless steel upper reinforcing plate, the stainless steel lower reinforcing plate and the stainless steel support at the connecting piece can maintain their shape and strength, providing enough escape time for people.

This utility model belongs to the field of air conditioner railings, specifically an easily assembled air conditioner railing. Addressing the problems of traditional air conditioner railings requiring skilled technicians, time-consuming installation, and site limitations, this invention proposes the following solution: The railing body consists of multiple horizontal bars and uprights. The horizontal bars are 20×20×1.2mm aluminum alloy / zinc-steel flat tubes, and the uprights are 40×40×2.0mm aluminum alloy / zinc-steel square tubes, all conforming to national standards, facilitating nationwide sourcing and eliminating the need for on-site secondary processing. During assembly, the horizontal bars are inserted into the archways on the side of the uprights, gently tapped into position with a rubber mallet, and then self-drilling screws are screwed into the round holes on the side of the uprights using an electric drill, penetrating the contact surface between the horizontal bar and the upright for fixation. A base plate is welded to the bottom of the uprights, and expansion bolts are used to fix the railing to the mounting surface through holes in the base plate. This structure uses embedded mechanical interlocking and self-drilling screws for quick fixation, improving installation efficiency and enhancing resistance to deformation and impact. Ordinary workers can operate it after simple training.

The invention relates to the technical field of stainless steel square tube machining equipment, in particular to a preparation process of a seamless stainless steel square tube and an inner polishing device. The inner polishing device comprises a machining table assembly used for supporting, and the machining table assembly comprises a preparation table and a round pipe transferring assembly used for clamping stainless steel round pipes and conveying the stainless steel round pipes to a specified collecting area. An electric signal is triggered through impact force of the multiple stainless steel round pipes and transmitted to the PLC control system, at the moment, the electric door is opened outwards, the multiple stainless steel round pipes can move towards the collecting assembly together to be collected, and therefore compared with the mode that the stainless steel round pipes are conveyed and collected in batches one by one, the device is higher in collecting efficiency, and the collecting efficiency is improved. And collision of the stainless steel round pipes in the conveying process is reduced, and the production quality of products is improved.

The application belongs to the technical field of continuous casting and relates to a free-cutting stainless steel bloom continuous casting method. The free-cuting stainless steel bloom continuous casting method comprises the following steps: 1) after molten iron is pretreated and smelted into qualified molten steel, the molten steel is lifted to a continuous casting fork arm by a crown block; 2) argon blowing is performed on a tundish for 5-10 minutes before pouring, and protective pouring is implemented throughout the continuous casting; 3) rapeseed oil is applied on the surface of a copper pipe of a crystallizer before pouring; 4) a pouring process; and 5) combined electromagnetic stirring parameters of the crystallizer and a terminal are 550 A / 4.5 Hz and 600 A / 15 Hz, and the parameters are reversed after 20 seconds. When the free-cutting stainless steel bloom is continuously cast by the application, the continuous casting open pouring leakage rate is reduced from 60% to 0, and the bloom low-multiple center porosity and shrinkage hole defects are reduced from level 2 to below level 1.

The invention belongs to the technical field of metallurgical materials, and particularly relates to continuous casting crystallizer casting powder for electric heating steel square billets and a preparation method of the continuous casting crystallizer casting powder. The casting powder comprises the following chemical components in percentage by weight: 36%-43% of SiO2, 19%-26% of CaO, 1%-3% of Al2O3, 6%-10% of Na2O, 2%-4% of Li2O, 1.5%-3% of B2O3, 8%-12% of F, 0.5%-2% of MgO, 0-1% of Fe2O3, 2%-4% of solid C, 5%-8% of volatile components and the balance of trace elements. The casting powder not only can meet the lubricating requirement of a crystallizer in the multi-furnace molten steel continuous casting process, but also degeneration caused by the reaction of the casting powder and the molten steel is delayed, the property of the casting powder is stable, surface and partial subsurface defects of an electric heating steel square billet are reduced, and the quality of the casting billet is improved.

A hydraulic jacking device for mounting a steel truss comprises a plurality of jacking frame standard knots which are vertically connected, a hydraulic jack, a bottom support and a top support, and each jacking frame standard knot comprises a plurality of groups of steel vertical rods and steel transverse rods which are oppositely and perpendicularly arranged. The steel cross rods are horizontally and fixedly connected among each group of the steel vertical rods which are relatively and vertically arranged, the hydraulic jacks are arranged in cavities of the jacking frame standard knots which are vertically connected, the bottom supports are arranged between the bottom ends of the hydraulic jacks and the jacking frame standard knots, and each bottom support comprises a bottom supporting plate, a steel square pipe and a hand wheel; the top support is arranged below the top plate and comprises a long stress square pipe fixedly installed at the bottom end of the top plate. The device solves the technical problems that in the construction process of an existing jacking device, stress square steel needs to be manually transferred, time and labor are wasted, and accidents are caused by accidental falling.

The utility model relates to the technical field of positioning tools, in particular to a positioning tool for processing a combined angle square, which comprises a placing table, a moving component, a clamping component and a square seat, and is characterized in that a groove is formed in the top of the placing table, a placing groove for placing the square seat is formed in the bottom of the groove, and the moving component is arranged in the placing groove. Connecting grooves are formed in the two side walls of the groove; the moving assembly comprises a first motor, a lead screw is installed at the output end of the first motor, a sliding block is arranged on the lead screw in a threaded mode, and the sliding block is installed at the bottom of the containing table. The utility model has the advantages that the placing groove in the groove is matched with the clamping assembly to ensure that the first plane of the ruler seat is tightly attached to the side wall of the groove, and the clamping jaw driven by the bidirectional screw rod is combined to provide clamping force for the first plane of the ruler seat, avoid the deviation of the ruler seat and improve the positioning accuracy of a processing surface; the first plane of the ruler seat is automatically aligned, the manual adjustment time is shortened, and the accuracy of the machining datum plane is guaranteed.

The utility model discloses an angle steel squaring auxiliary mechanism which comprises a bottom frame, an auxiliary trolley is arranged on the top of the bottom frame, two idler wheels are arranged at the lower end of the auxiliary trolley in the vertical direction at intervals, and the idler wheels are arranged at the upper end and the lower end of a square pipe at the upper end of the bottom frame respectively. A vertical clamping mechanism and a horizontal clamping mechanism are arranged on the auxiliary trolley, the vertical clamping mechanism is located at the upper end of the auxiliary trolley, and the horizontal clamping mechanism is located in the middle of the auxiliary trolley; through the vertical clamping mechanism and the horizontal clamping mechanism on the auxiliary trolley, the degree of freedom of the square angle steel in the vertical direction and the horizontal direction is restrained, the welding gun linearly moves along with the auxiliary trolley in cooperation with the rolling wheel mechanism, the tailor-welding operation is completed, the square angle steel is prevented from deviating, and the welding quality is improved. And the situation that the square angle steel needs to be welded again due to the welding problem is prevented, and the stability of the square angle steel welding quality is improved.

The utility model discloses a gap type waterproof aluminum plate curtain wall which comprises a frame system, a waterproof system and a decoration panel system. The frame system comprises steel square tube stand columns, steel square tube cross beams, steel connectors and bolt fasteners. The waterproof system comprises a waterproof aluminum veneer, a rubber leather cushion and a silicone weather-proof sealant; the decoration panel system comprises an aluminum column head, a decoration aluminum plate panel, a first aluminum plate auxiliary frame and an EPDM adhesive tape. The decorative aluminum plate panel does not make direct contact with the frame system, the waterproof aluminum single plates directly cover the outer surface of the frame system, and plate joints are sealed and waterproof through silicone weather-proof sealant, so that a continuous waterproof face is formed. According to the gap type waterproof aluminum plate curtain wall, no direct connection relation exists between the decorative aluminum plate face plate and the frame system, a traditional common mode that screws are directly hit on the frame system is not needed, the risk that rainwater permeates into a room through gaps of the screws is thoroughly avoided fundamentally, the building effect is good, the waterproof system is reliable and durable, and the service life is long. And reliable water prevention of the gap type curtain wall can be conveniently realized.

The invention discloses a heavy fair-faced concrete curtain wall plate mounting method based on a back-attached steel frame, and relates to the field of curtain wall mounting, and the method comprises the following specific steps: arranging a plurality of pre-anchoring assemblies for supporting and suspending on the back surface of a fair-faced concrete plate; a main keel rectangular pipe is installed on the outer vertical face of the wall body; the vertical galvanized steel rectangular pipe is connected with the fair-faced concrete slab through a pre-anchoring assembly; and the vertical galvanized steel rectangular pipe is hung on the main keel rectangular pipe through the combined hanging piece, and the height of the bare concrete slab is adjusted through the combined hanging piece. The pre-anchoring assemblies are designed on the back face of the fair-faced concrete plate, the anchoring strength of the curtain wall plate and the back connecting piece is enhanced, the rigid frame formed by welding the vertical galvanized steel rectangular pipes and the transverse galvanized steel rectangular pipes is attached to the plate body in a back-to-back mode, detachable connection with the main body keel is achieved through the adjustable combined hanging pieces, and the structure is simple and convenient. The heavy curtain wall plate is high in installation precision, can be finely adjusted after being in place, and is convenient and fast to operate.

This invention discloses a distributed passive acoustic decoy simulator with a multi-buoy spatial structure, comprising multiple individual models arranged linearly along the towing direction and sequentially connected by flexible connectors. Each individual model has a streamlined shape and a rigid frame structure welded from stainless steel square tubing. The rigid frame structure contains an array of floats, along with a counterweight unit to balance buoyancy. This invention utilizes multiple floats to form spatially discrete acoustic scattering units, and multiple individual models connected in series to form a distributed passive acoustic equivalent, effectively simulating the distribution characteristics and directional features of underwater vehicle target intensity. The rigid frame structure, as the main load-bearing component, combined with the design of the fairing and counterweight unit, improves the attitude stability of the simulator and the spatial positional stability of the scattering units under towing and complex hydrodynamic conditions. Furthermore, this simulator is inexpensive and easy to assemble and maintain.

The utility model relates to a standard double-base pneumatic spot welding positioning device, which is characterized in that two ISO standard hole top plates are combined to form a welding double base, and the device comprises a fixed seat, a quick clamp mechanism arranged above the fixed seat and a pneumatic locking mechanism connected with the fixed seat and the double bases; the fixing base, the quick clamp mechanism and the pneumatic locking mechanism are assembled into a welding tool platform, and the quick clamp mechanism is used for fixing side plates of double bases. The pneumatic locking mechanism comprises a first pneumatic locking mechanism and a second pneumatic locking mechanism which are respectively used for fixing the double-base top plate and positioning the connecting rib plate between the double bases. Compared with the prior art, the utility model adopts the rotary corner pressing cylinder to complete 90-degree rotary fastening or loosening of the double-base top plate and the parallel clamping jaw cylinder to push and loosen the connecting rib plate in parallel, so as to ensure that the angle square of each part is mounted in place, effectively shorten the assembly time, improve the production efficiency and realize automatic and high-efficiency spot assembly welding.

The invention discloses a UHPC curtain wall ground bearing welding and high-altitude fireless three-way fine adjustment construction method, and belongs to the technical field of building curtain wall installation. The method comprises the following steps: firstly, welding steel pendants to UHPC plate backing steel square tubes on the ground to form a whole bearing steel frame; then, a channel steel adapter and a main keel are installed on the outer wall, and a main keel hanging piece is fixed through a stainless steel bolt set; during high-altitude operation, only the bearing steel frame is integrally hung to a main keel hanging piece clamping groove, fine adjustment in the front-back direction and the up-down direction is achieved through the bolt set, and finally positioning is completed in the sectional fastening sequence of first middle, second outer and first upper and second lower. The whole process is free of high-altitude welding and chiseling, a single 2.04 m * 5.6 m ultra-large plate is hung in place at a time, the installation precision is smaller than or equal to 2 mm, the construction period is shortened, green and low noise are achieved, and the method is suitable for batch application of complex facade UHPC curtain walls of airports, high-speed rail stations, large venues and the like.

The utility model discloses a stainless steel square tube notching device, which relates to the field of stainless steel tube processing and comprises a fixing frame, a guide rail, a ball screw, a first motor, a clamping device, a support, a hydraulic cylinder, a tool bit and a second motor. The guide rails are arranged on the fixing frame, the ball screw is arranged between the guide rails, one end of the ball screw is connected with the first motor, a screw bearing is connected with the clamping device, and grooves matched with the guide rails are formed in the bottom of the clamping device. A hydraulic cylinder is arranged at the top of the support, a telescopic rod of the hydraulic cylinder is connected with the triangular cylinder tool bit, and the bottom surface of the tool bit is an inclined surface and forms an acute angle with the side surface; the second motor drives the hydraulic cylinder to stretch. Accurate sliding of the clamping device is achieved through the ball screw, the cutting precision is improved, the cutting resistance is reduced through the special structure of the tool bit, the stability and adaptability of the device are enhanced, and the device is suitable for efficient and accurate notch machining of the stainless steel square pipe.