39results about How to "Avoid Welding Stress" patented technology

The invention discloses a method for installing an abnormal-shaped extremely-large overhung steel truss under process monitoring construction. The installing method includes the steps that a steel structure truss deepening design and structure analysis model is built; steel truss parts are manufactured and pre-assembled, and the manufacturing process and the pre-assembling process are monitored; the steel truss is installed in site in a sectioned mode, and the steel truss installation process is monitored; unloading construction is carried out on the steel truss, and the steel truss unloading process is monitored; loading forming is monitored in the later period after the steel truss is installed in a staged mode; the structure of the steel truss is checked and accepted. The installation technology that a temporary supporting system and altitude spread assembling are combined is adopted, the large-span abnormal-shaped space lattice pipe truss is accurately installed, and the truss is evenly stressed and is not prone to deformation in the installation process. Heat accumulation, welding stress and welding deformation are prevented with the altitude spread roof-member method.

The invention discloses super span steel skew arch construction method. Its feature is that it adopts molding bed support sectionalizing installation method which includes the following steps: dividing the super span steel skew arch into twenty one construction units; assembling each of them by horizontal type assembling method; laying off and locating supporting molding bed by total stations instrument; installing supporting molding bed; orderly installing the 1-4, 18-21 sections steel skew arch in roof covering, the 5-10, 12-17 sections out roof covering, the eleventh healing section in roof covering; removing the supporting molding bed. The invention can eliminate installing accumulative error, increase insurance coefficient for whole project to ensure steel skew arch healing successful at a time. The method can be used in large scale hall super span steel skew arch construction.

The invention relates to an intermediate switchgear cabinet comprising a cabinet housing and a diaphragm integrating with the cabinet housing which divides the enclosure space enclosed by the cabinet housing into a busbar room, a handcart room, a relay instrument room and a cable room according to the function. The cabinet housing and the insulation diaphragm of the invention adopt assembly rather than welding, thereby avoiding welding stress. Furthermore the size of the invention is small and the installation and trial run is convenient.

A construction method for integrally hoisting a large-size multi-edge-and-corner overhanging truss is disclosed. Integral assembling of a steel pipe truss is conducted on site, and integral hoisting is conducted after assembling is completed; the truss is connected with three welding positions in a butt-joint mode and then is welded firmly; two 500 t all-terrain cranes and a 350 t all-terrain crane are adopted to hoist the whole truss simultaneously, and step-by-step hoisting is conducted from south to north; the truss is totally provided with three main stress support joints which are all fixed by adopting butt welding, a third calibration point support is located at the top of the truss, a welded ball joint at the position of the third calibration point is a support point of a steel rainshed grid frame actually, a first calibration point support and a second calibration point support are located on both the left and right sides of the bottom of the truss correspondingly, and the first calibration point support and the second calibration point support are global stress supporting points of the truss. The construction method for integrally hoisting the large-size multi-edge-and-corner overhanging truss has the characteristics that the construction safety is high, the construction period is short, the engineering quality is easy to guarantee, the ground integral assembling efficiency is high, and the construction cost is reduced greatly.

The present invention relates to a metal-clad movable metal-enclosed switchgear, which comprises a housing, a clapboard that surround the housing to be closed space of a bus-bar room, a cart room, a electric relay meter cabinet and a cable house; a circuit breaker cart is set in the cart room; the housing and the clapboard are made of Al-Zn coated steel sheet and they two riveted as a whole after bending; the circuit breaker cart is disposed on the chassis. The housing and the insulating clapboard in the invention is assembled but not welded with good-look appearance, welding stress is avoided, furthermore, the present invention is secure and reliable in use, and has good protective performance.

The invention discloses a motor rotor web crack welding repair method and solves the problems that a saw-toothed or crescent electrode is originally used to increase bath width and weld width, thermal stress is large and cracking occurs easily. A linear electrode manipulation method is adopted, a low-current small width welding method is adopted, arc ending is slow, a segment is re-welded to fill an end arc pit, the weld shape is changed, and cracking is avoided accordingly. A welding electrode A507 with higher tensile strength is used, a series of welding processes is taken, and the tensile strength of special equipment and special welds is met. The use of symmetric welding prevents excess welding stress effectively.

The invention discloses an engineering detection vehicle bogie frame. The engineering detection vehicle bogie frame comprises an H-shaped frame body composed of two side beams of a box-shaped structure and two cross beams of a hollow structure. Hollow auxiliary beams are fixed between the inner sides of the two cross beams. The middles of the side beams are sunken to form sunken parts used for mounting secondary spring seats. The outer sides of the middles of lower cover plates of the side beams protrude outward to form vertical oil pressure shock absorber seats. According to the trailer engineering detection vehicle bogie frame suitable for tread brake, the side beams are of the box-shaped structure, the cross beams and the auxiliary beams all adopt hollow steel pipes, thus the whole weight of the frame is effectively decreased while strength is guaranteed, and the purpose that a vehicle body is lightweight is achieved.

The invention discloses a double-sided double-glass assembly for a back contact solar cell, and a manufacturing method of the double-sided double-glass assembly. The manufactured assembly comprises afirst glass layer, a transparent conductive circuit layer, a first packaging material layer, a back contact cell layer, a second packaging material layer, a second glass layer and a junction box, which are sequentially laminated together from bottom to top. A conductive adhesive medium connecting point layer is arranged on the transparent conductive circuit layer; and the transparent conductive circuit layer is a conductive circuit formed on the first glass layer by a nano-silver conductive material. According to the invention, the double-sided power generation of the back contact battery canbe realized, the back light transmittance is high, and the higher double-sided rate can be realized. Meanwhile, the back contact technology and the double-sided power generation technology are superposed, and the transparent conductive thin film is adopted, so that the double-sided assembly achieves a high double-sided rate, welding stress caused by using a welding strip is avoided, hidden crack of the assembly is reduced, and assembly attenuation is small.

The invention relates to a large bridge support base plate and a connecting method thereof. The base plate is installed at the bottom of the steel beam bottom plate of a bridge and comprises a base plate body. Countersunk bolt holes are evenly formed in the middle area of the base plate body, and connecting weld joints welded and fixed to the steel beam bottom plate are arranged on the four sidesin the circumferential direction. The base plate body is installed at the bottom of the steel beam bottom plate in a matched mode through the countersunk bolt holes and countersunk bolts and is weldedand fixed to the bottom of the steel beam bottom plate through the connecting weld joints. The connecting method comprises the following steps: (1) controlling the connecting precision of the supportbase plate; (2) eliminating the welding stress of the support base plate; and (3) controlling the deformation of the support base plate. The problems existing in the prior art can be effectively solved, the mounting precision and stress safety of the ultra-large support base plate are guaranteed, the service life of a bridge is prolonged, and operation safety is improved.

Concrete upper ribs and floors of a novel steel-concrete combined open web girder system are made of cast-in-place concrete and form an orthogonal cross shape; holes are formed in reverse T-shaped joints of combined components so that concrete can be conveniently cast into the holes and shear connectors can be formed; reverse T-shaped steel pipes and U-shaped steel plates are all prefabricated in a factory, in the use process, the U-shaped steel plates penetrate through reserved holes in the bottoms of the reverse T-shaped steel pipes, and the T-shaped steel pipes and the U-shaped steel plates are positioned through high-strength bolts of bottom plates, and concrete is cast into the shear connectors into a whole. The system has the advantages that the structural deadweight is reduced, and rigidity is less reduced; the size of the shear connectors is reduced, and the rigidity of the shear connectors is improved; tensile force is borne by the square steel pipes, the steel pipes participate in shear resistance at the joint shear connectors, and the mechanical performance of materials is brought into full play; no welding or formworks are needed, welding stress and deformation are avoided, construction procedures are reduced, and construction efficiency is greatly improved.

The invention discloses a new-type hinge expansion joint for a high-temperature flue of a flue gas turbine. The new-type hinge expansion joint comprises a pipe nipple I, a pipe nipple II, a corrugatedpipe, a load-bearing frame I, a load-bearing frame II, two sets of hinge mechanisms and eight sets of support assemblies, wherein the pipe nipple I, the corrugated pipe and the pipe nipple II are connected in sequence; the load-bearing frame I is located on the side where the pipe nipple I is located and supports the pipe nipple I through four of the sets of support assemblies; the load-bearing frame II is located on the side where the pipe nipple II is located and supports the pipe nipple II through the other four sets of support assemblies; and the two sets of hinge mechanisms are mounted between the load-bearing frame I and the load-bearing frame II. The invention ensures the persistent working of the expansion joint under high temperature, thereby prolonging the service life of the product.

The invention relates to the technical field of aero-engines and particularly provides a fan casing. A processing scheme of welding the casing with each stator blade is adjusted into a scheme that whole-ring stator blades with second outer rings are inserted into first outer rings, and welding and heat treatment processes are eliminated, so that the problems that the casing is deformed, the bodiesof the stator blades are misplaced, the axial length of a wear-resistant coating is insufficient due to a small axial clearance between a rotor and a stator, and the allowance of the casing is smalldue to a big margin plate are solved, and the vibration resistance of the casing is enhanced.

The invention discloses an integrated liquid rocket engine thrust chamber top cover structure, and belongs to the technical field of machinery. The top cover comprises a force bearing end face, a propellant inlet bent pipe, a propellant inlet flange, a top cover inner cavity, an inner conical surface, an outer conical surface, a top cover bottom surface and a force bearing wall. Thrust generated by a thrust chamber of the liquid rocket engine is transmitted to the top cover from the bottom face of the top cover, transmitted to the force bearing wall through a triangular force bearing structure formed by the inner conical face and the outer conical face and finally transmitted to an engine rack through the force bearing end face. Propellant enters the top cover from a propellant inlet in the propellant inlet flange, flows through the propellant inlet bent pipe, enters the inner cavity of the top cover and then enters the downstream nozzle.

The invention relates to an installation process of large tuyere blades. The installation process comprises the steps that S1, a blade positioning device is established and comprises a positioning structure, an alignment structure and a tie bar structure; S2, multiple blade bodies are sequentially and correspondingly inserted into notches of multiple positioning seats, so that the distribution direction of the multiple blade bodies is consistent with the extension direction of the long axis of the positioning seats; S3, tie bar rods are inserted into aluminum pipes, and then the aluminum pipes inserted with the tie bar rods penetrate through penetrating holes of the multiple blade bodies; S4, under the contraction action of second driving cylinders, limiting baffles enable the tie bar rods to be embedded in limiting grooves of the limiting baffles; S5, pulling assemblies are started, and the tie bar rods are pulled out of the aluminum pipes under the horizontal pulling force of the corresponding pulling assemblies; and S6, the installed tuyere blades are subjected to integral discharging from the positioning seats. The installation process has the following advantages that the mounting precision and the mounting efficiency are improved, welding stress and welding defects caused by traditional welding fixation are avoided, and the connecting stability of the blade body is guaranteed.

The invention discloses a bolting and grading device high in productivity and easy to maintain and belongs to the technical field of mechanical equipment. According to the bolting and grading device high in productivity and easy to maintain, two external transmission device synchronous operating structures are adopted, running is stable and reliable, and maintaining is easy; and meanwhile, a lot of screen body inner space is saved, optimized design of a screen way is facilitated, and the productivity is improved. In the bolting and grading device high in productivity and easy to maintain, thescreen way structure in multi-way feeding is adopted, and screen lattices and a screen frame are of a pulling structure; a screen door is in hinge connection and can achieve compressing of the screenlattices and the screen frame through a compressing handle after closing of the screen door; an oleophobic layer is added on a screen frame bottom plate; a rack is of a movable connection structure; apulse valve is used for being connected with external high pressure gas, and periodical automatic gas spraying for screen net clearing is achieved, and the productivity is improved due to many optimized design; and meanwhile operating and installing are facilitated, and the maintaining difficulty is lowered. The bolting and grading device achieves the characteristics that the productivity is highand maintaining is easy.

The invention discloses a brick making die structure with hanging rods and cores flexibly replaced. The structure comprises a die core frame, the hanging rods and the cores. The die core frame comprises transverse baffle plates and longitudinal baffle plates, the cores are arranged on the hanging rods and extend into a brick making die cavity, the tops of the longitudinal baffle plates are provided with first clamping grooves corresponding to the hanging rods, the outer side of the die core frame is provided with guard plates, and the tops of the guard plates are provided with cover plates extending horizontally outwards; and second clamping grooves corresponding to the first clamping grooves are formed in the tops of the guard plate positioned on one side of the die core frame or on the outer sides of the longitudinal baffle plates on the two sides, and first positioning blocks positioned in the corresponding first clamping grooves are arranged on the two sides of the hanging rods. Through the mode, the brick making die structure with the hanging rods and the cores flexibly replaced, the hanging rods and the cores are assembled and positioned accurately, and are independently replaced after being disassembled, so that the maintenance cost is greatly reduced, and the service life of a die is prolonged.

The invention discloses an automobile anti-collision beam mounting structure and a mounting method. The automobile anti-collision beam mounting structure comprises an anti-collision beam, an automobile body longitudinal beam, a bolt, a reinforcing sleeve and a welding nut, the anti-collision beam is an arc-shaped cross beam matched with the outline shape of the front end of a vehicle body, the cross section of the anti-collision beam is of a hollow cavity structure, the two ends of the anti-collision beam are fixedly assembled with the front end face of a vehicle body longitudinal beam through bolts, and reinforcing sleeve assembly holes are formed in the inner side arc face and the outer side arc face of the matched position of the anti-collision beam and the front end face of the vehicle body longitudinal beam. A welding nut is pre-welded on the inner side wall of the front end surface of the vehicle body longitudinal beam; the two ends of the reinforcing sleeve are embedded in reinforcing sleeve assembly holes formed in the inner side arc face and the outer side arc face of the anti-collision beam respectively. The bolt penetrates through the reinforcing sleeve to be assembled with the welding nut. The strength of the joint of the anti-collision beam and the longitudinal beam of the automobile is effectively enhanced, the problem that a collision force transmission path is changed due to the fact that the anti-collision beam is pulled out too early at the joint is solved, and the purposes of improving the impact resistance of an automobile body and guaranteeing the safety of the automobile are achieved.