308results about How to "Control deformation" patented technology

The invention provides an ultrathin substrate polishing head and an ultrathin substrate polishing device.The ultrathin substrate polishing head comprises a polishing head body, a substrate holding part and a substrate holding ring, the substrate holding part and the substrate holding ring are both connected to the bottom of the polishing head body, the substrate holding ring is arranged on the periphery of the substrate holding part in a sleeving mode, an elastic film is arranged on the bottom face of the substrate holding part, and the elastic film is arranged on the bottom face of the substrate holding part. An adsorption hole is formed in the substrate holder in a penetrating manner, a through hole is formed in the elastic film, and the substrate holder is used for adsorbing the substrate to the bottom wall of the elastic film. According to the ultrathin substrate polishing device provided by the invention, the elastic film is arranged below the substrate holder, so that the adsorption force of the air bag on the substrate can be effectively buffered, the problems of non-uniform stress and overlarge local deformation of the substrate are avoided, the deformation quantity of the substrate in the grinding process is effectively controlled, the probability of occurrence of fragments is reduced, and the polishing quality of the ultrathin substrate is improved. The high flatness, uniformity and consistency of the surface of the substrate are improved, and meanwhile the polishing rate of the edge position of the substrate is increased.

The invention relates to the technical field of fabrics, and discloses a preparation method of an anti-wrinkle comfortable fabric, which comprises the following steps: by taking alkyl diamine, acrylonitrile, gamma-chloropropyl methyl dimethoxy silane and the like as raw materials, carrying out addition reaction, hydrolysis reaction and quaternization reaction to obtain polycarboxyl disilane gemini quaternary ammonium salt; octamethylcyclotetrasiloxane, polycarboxyl disilane gemini quaternary ammonium salt and the like are used as raw materials, quaternary ammonium salt modified polysiloxane is obtained through base catalysis copolymerization, then the quaternary ammonium salt modified polysiloxane is emulsified and prepared into finishing liquid, pure cotton fabric is soaked in the finishing liquid, and the anti-wrinkle comfortable fabric is obtained through two-dipping and two-rolling finishing. The crease resistance of the fabric is improved by utilizing a large number of amino groups and carboxyl groups contained in the finishing liquid, and the antibacterial property of the fabric is improved by utilizing a quaternary ammonium salt structure contained in the finishing liquid. Experiments prove that the prepared fabric has good crease-resistant comfort performance and antibacterial performance.

The invention discloses an expansion shell type low-prestress energy-absorbing anchor rod and a construction method thereof.The expansion shell type low-prestress energy-absorbing anchor rod comprises a conical head, expansion shell pieces, an inner rod and a sleeve rod, the rear end of the conical head is connected with the inner rod in the axial direction, and the conical head comprises a conical section, a circular truncated cone section and a cylindrical section which are connected in the axial direction from front to back; the expansion shell piece is a cylindrical shell and is coaxially arranged outside the conical head in a sleeving manner; when the conical head moves towards the shell expansion piece at the rear end, the large-diameter part of the circular truncated cone section backwards enters the shell expansion piece, and the shell expansion piece outwards deforms in the radial direction; the inner rod is a columnar rod body, the upper wall and the lower wall of the rear section of the inner rod are each provided with a plurality of first arc-shaped protrusions, and the first arc-shaped protrusions are arranged at intervals; the sleeve rod is in a columnar shell shape, and a plurality of second arc-shaped protrusions are arranged on the inner wall of each semi-cylindrical shell at intervals in the length direction of the semi-cylindrical shell; the sleeve rod is coaxially arranged outside the inner rod in a sleeving mode, and the second arc-shaped protrusion and the first arc-shaped protrusion are meshed. The anchor rod is firm in anchoring, excellent in extension performance and suitable for soft rock large deformation or hard rock rockburst stratum reinforcement engineering.

The invention discloses a roadway surrounding rock dynamic accurate control method, and relates to the technical field of underground roadway surrounding rock control. The technical problem that in the prior art, blindness exists in support design in roadway surrounding rock control is solved. The method comprises the steps that a data collection and analysis system is used for collecting and analyzing mine geological data and evaluating geomechanics key indexes; the stability influence factor analysis system evaluates the existing roadway support stability by classifying the roadway surrounding rock stability; a targeted supporting scheme is provided in combination with an existing supporting scheme, related standards are established, and continuous dynamic optimization and improvement are conducted on follow-up supporting design. According to the method, dynamic analysis and targeted design are carried out on the roadway, roadway deformation can be effectively controlled, the comprehensive cost of roadway supporting is reduced, the roadway tunneling efficiency is improved, the problem of coal mine excavation imbalance is solved, safety accidents caused by supporting design are avoided, and dynamic precise control over surrounding rock of the underground roadway is achieved.

The invention relates to the technical field of concrete preparation, in particular to sprayed concrete with high crack resistance and low rebound rate and a preparation method thereof. The nano aerogel, the polypropylene fiber and the modified vermiculite are creatively adopted to prepare the sprayed concrete, and the nano aerogel has the water retention and moisture absorption characteristics and plays an internal curing role in the concrete, so that the internal water loss rate is reduced, the shrinkage of the concrete is weakened, and the concrete is prevented from being damaged. Meanwhile, the polypropylene crude fiber with high breaking strength and elasticity modulus and a composite cross-linked network structure formed by the polypropylene crude fiber and the modified vermiculite can greatly improve the crack resistance and durability of the sprayed concrete under the interaction; furthermore, when the concrete is cracked, the modified liquid flows out of the inner cavity of the vermiculite and is adhered and cured at the crack to realize a self-repairing effect, so that the structural deformation of the tunnel can be better limited, and the service life of the tunnel lining in a complex environment is prolonged.

The invention provides a soft rock roadway bottom plate reinforcing method. The soft rock roadway bottom plate reinforcing method comprises the following steps that S1, a bottom plate of a roadway is trimmed; s2, a reinforcing mesh is laid on the first concrete layer; anchor rods and / or anchor cables are driven to the bottom plate at intervals on the first net layer in the extending direction of the roadway; s3, grouting is conducted in the holes where the anchor rods and / or the anchor cables are located so that anchoring and fixing can be achieved; then, grouting is conducted on the first net layer; s4, a reinforcing mesh is laid on the second concrete layer, then grouting is conducted on the second mesh layer, a third concrete layer is formed through solidification, and the part, facing the second mesh layer, of the third concrete layer is of a downwards-protruding arch structure; by means of the method, the bottom plate of the roadway is stabilized and reinforced, the supporting and reinforcing strength of the bottom plate is higher, the three concrete layers have certain elastic deformation capacity, damage, cracks and failure caused by damage to the surface of the bottom plate of the roadway are avoided, and long-term stable work of the roadway is guaranteed.

The invention relates to a beam-first and arch-second construction method for a large-span through bolt-welding combined system steel box tied arch bridge, which comprises the following steps of: obtaining an under-bridge construction platform based on a preset bridge way system of the steel box tied arch bridge; on the basis of the under-bridge construction platform, sequentially completing suspended assembly of one straining beam, longitudinal and transverse beams and the other straining beam which are in bridge joint with piers at the two ends of the steel box tied-arch bridge, and after suspended assembly, completing fixed connection between the straining beams and the longitudinal and transverse beams in an auxiliary mode through the wedge-shaped lifting platform to obtain a spandrel girder structure; based on the bearing beam structure, laying of a temporary bridge deck system is completed, arch span structure construction is completed, and bridge deck system construction of the steel box tied-arch bridge is completed. According to the invention, the number of high-altitude supports is reduced, the cost of construction measures is saved, temporary construction measures are reduced, and the method has the advantages of improving the construction efficiency and reducing the cost.

The invention discloses a novel anti-slide pile and an intelligent regional landslide monitoring and management method and system, relates to the technical field of landslide monitoring, combines the functions of real-time monitoring, early warning and prediction, structural stability evaluation, maintenance scheme analysis and the like, is beneficial to improving the scientificity, accuracy and efficiency of landslide control, reduces the geological disaster risk, and improves the safety of landslide management. Meanwhile, by combining elements such as the inclined piles in front of the piles, the anchor cables and the water guide pipes, the structure not only improves the stability of the slide-resistant piles, but also can effectively control deformation and drainage of landslides, so that geological disaster risks are reduced, casualties and economic losses are reduced, and the structure is composed of the slide-resistant piles, the anchor cables, the inclined piles in front of the piles, the water guide pipes and the drainage pipes; the anti-slide pile is a hollow pile, the anchor cable and the inclined pile in front of the pile are constructed in the hollow pile, the hollow pile part is filled with concrete after the anchor cable and the inclined pile are constructed, and the concept that the anchor cable cannot be constructed in a traditional embedded anti-slide pile is changed.

The utility model belongs to the technical field of fitness equipment, and particularly relates to a connecting structure of fitness equipment, which comprises a grip and an elastic rod which are detachably connected, a spring part connected with the grip is arranged on the elastic rod, a mounting bulge is arranged on the grip, a spiral groove is arranged on the periphery of the mounting bulge, and the spring part is sleeved on the mounting bulge and matched with the spiral groove. The spring part is matched with the spiral groove to relatively fix the grip and the elastic rod; the handle is controlled to reciprocate, the spring part enables the handle to vibrate, and the connecting structure of the body builder is convenient to assemble, produce, disassemble and maintain.

The utility model provides a large-span channel-crossing tied arch bridge tie beam vertical stepping lifting structure which comprises a plurality of lifting devices, each lifting device comprises a tie beam connecting device, a vertical threaded rod, a tie rod connecting frame, a hollow jack and a tie rod, and the lower end of the tie rod is connected to the tie rod connecting frame. The lower end of the hollow jack is connected with the upper end of the connecting sleeve, the lower end of the vertical threaded rod is connected with the straining beam connecting device, the upper end of the vertical threaded rod sequentially penetrates through the connecting sleeve and the hollow jack and then is connected with the upper suspension nut, and the vertical threaded rod is in threaded connection with the lower suspension nut. The lower hanging nut is used for being hung on the bottom wall so that the vertical threaded rod can be hung on the connecting sleeve. The lifting device has the advantages that the position of the straining beam can be conveniently and reliably lifted to meet the requirement, and the problem that the lifting cost is high due to the fact that a supporting platform is lapped in water to support lifting equipment to lift and lock the straining beam in the prior art is solved.

The invention discloses a technological method for refining oxygen-free copper plate crystal grains. The technological method comprises the following steps that an electrolytic copper plate is placed in a furnace bin to be melted, the surface of the electrolytic copper plate is covered with charcoal, semi-continuous casting billet drawing is carried out, and an oxygen-free copper cast ingot is produced; the oxygen-free copper casting blank is put into a heat preservation furnace to be preheated, the preheating temperature ranges from 800 DEG C to 900 DEG C, and the heat preservation time ranges from 2 hours to 3 hours; the preheated cast ingot is subjected to upsetting and drawing, the upsetting deformation is 50%-60%, the cast ingot is drawn to 150%-160% of the original cast ingot, and the upsetting and drawing times are 3-4 times; warm forging and square drawing are started, the warm forging temperature ranges from 700 DEG C to 750 DEG C, the cast ingot is upset to 50%-60% of the original length, square drawing is conducted to the needed blank length, and the final forging temperature is kept to be larger than or equal to 700 DEG C; the blank is cooled to the room temperature, cold forging is started, multiple passes of cold forging are conducted, the rolling reduction of each pass is 10%-15%, and the final cold forging deformation is 30%-60%; and the oxygen-free copper blank obtained after cold forging is subjected to aging heat treatment, the aging heat treatment temperature ranges from 350 DEG C to 450 DEG C, the aging heat treatment time ranges from 1 h to 2 h, air cooling is conducted after annealing, and the oxygen-free copper plate is obtained.

The invention relates to the technical field of investment casting of hollow castings, in particular to a low-deformation high-strength ceramic core and a preparation method thereof.The low-deformation high-strength ceramic core comprises ceramic core powder, and the ceramic core powder comprises, by mass, 30-85% of high-temperature calcined high-bauxite powder, 10-50% of electric smelting mullite powder and 1-20% of alumina powder. According to the ceramic core and the preparation method thereof disclosed by the invention, the ceramic core prepared by accurately proportioning the high-temperature calcined high-alumina bauxite powder, the electrically-fused mullite powder and the alumina powder and combining the synergistic effect of the toughening agent, the pore forming agent and the plasticizer has relatively low deformation and relatively high high-temperature strength, and can meet the requirements of hollow directional / single-crystal castings and polycrystalline hollow castings which are poured at high temperature.

The embodiment of the invention provides a battery monomer, a battery and an electric device. The reliability of the battery monomer can be improved. The battery cell includes: a housing having a first wall; the pressure relief mechanism is arranged on the first wall; an electrode assembly, wherein the electrode assembly is accommodated in the shell; and the supporting component is arranged opposite to the pressure relief mechanism and is used for limiting the electrode assembly to move towards the first wall.

The invention provides a TC4 titanium alloy thin-wall slender structure liquid cooling plate brazing method, and belongs to the technical field of micro-channel heat exchange. The problems that according to an existing welding method for the TC4 titanium alloy thin-wall long and thin structure liquid cooling plate, the metal brazing connection performance is not stable, a connection interface has defects, and the flatness of the welded thin-wall liquid cooling plate is poor are solved. The thin-wall liquid cooling plate and the slender structural part are buckled and combined, metal foil type brazing filler metal is clamped between the thin-wall liquid cooling plate and the slender structural part to form a TC4 titanium alloy thin-wall liquid cooling plate and slender structural combined part, a graphite pressing block A and a graphite pressing block B are combined and pressed on the TC4 titanium alloy thin-wall liquid cooling plate and slender structural combined part, and after being assembled, the TC4 titanium alloy thin-wall liquid cooling plate and slender structural combined part are put into a vacuum furnace. According to the method, the one-time welding success rate is increased, meanwhile, the brazing seam quality is better, intermetallic compounds of the welding seam are uniform in welding seam microcosmic metallographic display, and the phenomena that the brazing seam is not resistant to pressure and prone to leakage are greatly reduced.

The utility model relates to a novel double steel plate concrete composite wall structure for a bridge tower, which comprises a shear wall system, two ends of the shear wall system are connected with steel-concrete composite columns through high-strength bolts, and the shear wall system comprises two wall steel plates which are arranged in parallel. A plurality of longitudinal partition plates are erected between the two wall body steel plates at intervals in the length direction of the wall body steel plates, the longitudinal partition plates are vertically and fixedly connected to the two wall body steel plates, a plurality of round lightening holes are formed in the longitudinal partition plates, and in-wall concrete is poured between the two wall body steel plates and the longitudinal partition plates. Longitudinal partition plates with lightening holes are arranged in the shear wall system to serve as stiffening ribs, and long studs serve as connecting pieces of a wall steel plate and concrete in the wall, so that the wall can be divided into a plurality of cavities, the construction form is simple, the stress of the connecting pieces is clear, the material consumption is reduced, and the construction cost is reduced. And the strength, ductility, corrosion resistance and fireproof performance of the structure are enhanced.

The utility model provides an inclined support temporary support changing device for a basement foundation pit, a supporting structure is arranged in the foundation pit, and two ends of a horizontal supporting assembly are fixed on the supporting structure and stretch across the interior of the foundation pit; the basement structure comprises floor slabs and an outer wall which are sequentially constructed in a foundation pit, and a horizontal supporting assembly is correspondingly arranged on the upper side of each floor slab and the upper side of the outer wall. The inclined supporting assembly is correspondingly arranged on the lower side of the horizontal supporting assembly to be dismantled, one end is connected with the supporting structure, and the other end is connected with a corresponding floor on the lower side of the horizontal supporting assembly to be dismantled. After the construction of the corresponding floor is completed, the inclined supporting assembly is arranged between the supporting structure and the floor, supporting force provided by the inclined supporting assembly can equivalently replace a horizontal supporting assembly to be dismantled, and after the horizontal supporting assembly corresponding to the floor is dismantled, the stability and the bearing capacity of the foundation pit supporting structure are effectively guaranteed; deformation of the foundation pit and the surrounding environment is controlled, and safety of buildings (structures), underground pipelines and the like around the foundation pit is guaranteed.

The invention relates to the technical field of powder metallurgy and magnetic materials, in particular to a preparation method of high-insulation coated powder for an inductor, which comprises the following steps of: 1, uniformly mixing raw powder, and adding a surfactant and a dispersing agent in the mixing process to obtain soft magnetic powder particle cores, 2, mixing a first solution with the sieved soft magnetic powder particle cores to form a first mixture, and enabling the first solution to form a first coating layer; 3, a second solution and the soft magnetic powder particle cores in the step 2 are mixed to form a second mixture, and a second coating layer is formed; 4, a third solution and the soft magnetic powder particle cores in the step 3 are mixed to form a third mixture, and a third coating layer is formed to coat the outer surface of the second coating layer; and 5, forming a bonding layer by using the fourth solution, and coating the outer surface of the coating layer III with the bonding layer. Through a three-layer insulation and bonding layer resin coating process, the structural stability is improved, the toughness of the insulation layer is increased, and the insulation of the powder is still maintained in the pressing process.

The invention relates to the technical field of underground engineering foundation pit support, and discloses a vertical anchoring type reinforced double-row pile support, the structure is mainly composed of front-row support piles, rear-row support piles, vertical anchor cables, a coupling beam, a coping concrete plate and a crown beam, the anchor cables are perpendicular to the ground and arranged between the rear-row support piles or in the rear-row support piles in a driving mode; a cavity needs to be reserved when the vertical anchor cables are driven into the top beam between the piles, PVC pipes need to be embedded in the piles when the vertical anchor cables are driven into the piles, anchor heads of the vertical anchor cables are anchored on the top beam and form a whole with the top beam, an adjusting well is arranged on the left side of the back-row supporting piles, two rectangular plates are fixedly connected to the inner wall of the adjusting well, and a bearing is fixedly connected to the inner wall of each rectangular plate. The inner ring of each bearing is fixedly connected with a rotating shaft; a steel frame supporting body structure is not needed, and the supporting structure is a cantilever type supporting structure and has good adaptability.

The invention relates to the field of extrusion forming of piston skirts, in particular to an extrusion forming process of a large-size piston skirt of a marine diesel engine, which comprises the following steps of: placing a piston skirt raw material in a pre-forging annular die and a pre-forging lower die, pressing and moving downwards through a pre-forging convex die, forming a piston skirt pre-forging piece, taking out the pre-forging convex die, and replacing the pre-forging convex die with a finish-forging convex die; according to the method, the extrusion deformation process of the piston skirt is optimized, the internal metal deformation is smoother, the structure is more uniform, the metal flowing state of an area A with the most concentrated stress in the using process of the piston skirt is particularly improved, and the piston skirt forging is formed through downward pressing and movement of the finish-forging male die. And the overall quality is improved.

The invention provides a copper-based graphite sealing material for an aero-engine and a preparation method of the copper-based graphite sealing material. The copper-based graphite sealing material can meet the performance requirements of a sealing bush for the aero-engine in different directions. The material is a copper-based graphite sealing material formed by directionally arranging anisotropic lamellar graphite; the material is prepared from the following raw materials in percentage by mass: 60%-70% of copper powder, 18%-32% of iron powder, 6%-12% of graphite, 0.01%-0.5% of silicon dioxide, 0.01%-0.5% of aluminum oxide and 0.01%-0.5% of tungsten disulfide, and the sum of the mass percentages of the components is 100%. The copper powder is irregular electrolytic copper powder, the content of Cu is larger than or equal to 99.9%, and the particle size range is 48-100 microns; the iron powder is porous sponge iron powder, the content of Fe is larger than or equal to 99.9%, and the particle size range is 48-100 microns; the graphite is natural lamellar graphite, the particle size range is 48-100 [mu] m, and the thickness range is 8-18 [mu] m; the particle sizes of the silicon dioxide, the aluminum oxide and the tungsten disulfide are 2-5 microns.

The invention discloses a precise hole lug piece and a manufacturing method of a high-edge-strip titanium alloy rib part, and relates to the technical field of forging. According to the specific technical scheme disclosed by the invention, the method comprises the steps of reaming a process hole, clamping a high-edge strip surface, roughly machining a part lug surface, roughly machining the part high-edge strip surface, naturally aging, semi-finishing the part lug surface, finishing the part lug surface, reaming a side wall precision hole of the part lug surface, semi-finishing the part high-edge strip surface, and finishing the part high-edge strip surface. And measuring the size of the part, and removing the process patch and the patch on the two sides. The machining method effectively solves the problem of machining precision holes in the side walls of the lug pieces of the parts, the problem of vibration of the high-edge-strip parts in the machining process and the problem of residual closed angles of the parts, meanwhile, deformation of the parts in the machining process can be controlled, and then the size and precision of the parts are guaranteed.

The invention discloses a single-line automatic inter-station block inter-station communication transmission system, and relates to the technical field of railway signal control. Comprising a line relay control module which is responsible for controlling a line relay XLJ, and the core of the line relay control module is to control the suction and falling of the XLJ through the state change of the ZDJ; the vehicle receiving relay driving module is used for realizing the control of vehicle receiving and departure through a 1ZCJ driving circuit; the logic control of the 1ZCJ relates to a plurality of conditions, including states of ZDJ, JJ, LXJF and JGJF; wherein the ZDJ is the state of inter-station signal equipment, the 1ZCJ is a vehicle connection relay, and the JJ is a vehicle connection relay. According to the system, the rail state, the train position and the signal equipment state are monitored in real time, potential safety hazards can be found in time, measures can be taken, and accidents are effectively prevented; based on automatic control logic, dependence on manual operation is reduced, and difficulty and cost of daily maintenance and troubleshooting are reduced.

The invention provides a geotechnical mat with an electroosmosis function, and belongs to the technical field of geotechnical mats. The geotextile mat comprises a fixing rod arranged on a geotextile mat body; the electrodes are arranged on the geotechnical mat body, are fixed on the fixing rods, are used for providing an electroosmosis function for the geotechnical mat and are also used for serving as keels of the geotechnical mat to limit deformation of the geotechnical mat; the data collector is arranged on the geotechnical mat body and used for measuring the pressure and the water content of the tailings and transmitting the pressure and the water content to the power supply collecting device; and the potential probe is arranged on the data acquisition unit and is used for measuring current and voltage between the tailings and transmitting the current and voltage to the power supply acquisition device. The electrodes and the data collector are arranged on a traditional geotextile mat, and the power supply collecting device is matched, so that the geotextile mat has the electroosmosis function, the drainage strength can be adjusted according to the actual situation, and monitoring-drainage integration is achieved.

The forge piece structure of the partition piece comprises a body and a cylindrical arching part, the axis of the cylindrical arching part is parallel to the plane where the body is located, the cylindrical arching part protrudes out of the body in the thickness direction, and the part, protruding out of the body, of the cylindrical arching part is a smooth cambered surface. And the fillet radius of the cylindrical arching part and the edge of the side surface is less than or equal to 5mm. The forge piece structure of the partition piece has the advantages of being free of protruding blocks on the surface, higher in safety performance, good in filling effect, small in deformation amount, high in material utilization rate and beneficial to cutting machining for positioning.

The invention discloses a graded thread multi-stage yielding steel arch and a design method, the steel arch is composed of a plurality of steel arch assemblies, every two adjacent steel arch assemblies are connected through a graded thread multi-stage yielding device, and the graded thread multi-stage yielding device is composed of a multi-stage yielding device upper assembly and a multi-stage yielding device lower assembly which are matched with each other; the multi-stage yielding device upper assembly comprises a sleeve, a connecting rod and a spherical end, the connecting rod is installed on the upper end plate and located in the sleeve, the spherical end is connected with the lower end of the connecting rod, the multi-stage yielding device lower assembly comprises a lower end plate and multi-stage yielding dampers, a plurality of through holes are formed in the lower end plate, and one multi-stage yielding damper is installed in each through hole. The yielding damper has the advantages that according to different geological conditions or surrounding rock deformation, the graded threads in the yielding damper designed through stress analysis can adapt to large deformation of different surrounding rocks, and the safety of a steel arch and a tunnel is protected.

The invention discloses a heat exchanger tube plate and barrel welding seam welding process. The process comprises the following steps of A, preparation before welding; b, the aluminum gasket is machined; c, assembling an aluminum gasket; d, a plurality of rigid fixing blocks are welded to the outer edges of the two tube plates; e, the two tube plates are arranged between the two barrels and assembled in pairs; f, the two tube plates and the two barrels are subjected to manual arc welding and tack welding; g, preheating before welding; h, manual argon tungsten-arc welding backing weld bead welding; i, manual arc welding filling cosmetic welding bead welding is conducted; J, after welding seams are cooled, all rigid fixing blocks are polished and removed, and welding scars are polished to be flush with base metal; k, polishing and removing all defects on two sides of the weld to ensure that the weld surface must be in smooth transition with the outer surfaces of the tube plate and the cylinder; and L, nondestructive testing. By means of the welding process, the welding quality is stable and reliable during large-diameter heat exchanger tube plate welding, and component welding deformation can be controlled within the design requirement range.

The invention belongs to the technical field of aircraft manufacturing, and discloses a stainless steel deep U ship-shaped thick skin tailor-welding drawing shape control method and a forming die, which are used for reversely calculating various key sizes of a drawing process piece by constructing different drawing coefficients and controlling the deformation degree of each part of the drawing process piece. The technical problems that a stainless steel deep U-shaped ship-shaped thick skin blank is insufficient in size, prone to instability and wrinkling in the forming process and large in resilience after being formed are solved. According to different bearing strengths of all parts of a tailor-welded blank, structural design key points of the drawing die are specified in detail, including a gap between a convex die and a concave die, a blank pressing gap, a gap between a drawing rib and a drawing groove and the like, the design thought is complete, the structural design of similar dies can be guided, and the universality is high.

The flexible photovoltaic cable force anchoring device with the automatic adjusting and monitoring functions comprises an anchoring body which is used for being fixed to a flexible photovoltaic support and connected with an inhaul cable; the inhaul cable penetrates through the cross beam, is connected with the photovoltaic panel and is used for providing prestress; the cable force adjusting mechanism is connected with the anchoring main body and is used for automatically adjusting the cable force of the inhaul cable according to the monitored cable force change; the cable force adjusting mechanism comprises an automatic adjusting device which is connected with the inhaul cable and used for automatically adjusting cable force according to cable force changes of the inhaul cable. The spring is connected with the automatic adjusting device, and the spring stretches out and draws back to adjust the length of the inhaul cable in the span of the flexible support so as to adjust the cable force. A monitoring sensor is installed on the cable force adjusting mechanism and used for monitoring the cable force of the inhaul cable in real time and sending monitoring data to the cable force adjusting mechanism for cable force adjustment. The flexible photovoltaic support is mainly used for improving the reliability and durability of the flexible photovoltaic support and reducing potential safety hazards caused by cable force changes, and has remarkable technical advantages and application value.

The present invention relates to the field of construction engineering technology, and in particular, to a foundation pit support structure. The foundation pit support structure includes a plurality of auxiliary retaining piles and a plurality of steel supports; the plurality of auxiliary retaining piles are arranged on the side of the auxiliary foundation pit away from the main structure, and are arranged opposite to the main retaining piles; the steel supports are supported between the auxiliary retaining piles and the main secondary lining lintel of the main structure. The above-mentioned foundation pit support structure adopts the secondary lining lintel of the main structure as the internal fulcrum of the steel support, which ensures the force transmission balance of the steel support and solves the problem of erecting the steel support well; the above-mentioned foundation pit support structure has the advantages of clear force transmission, convenient construction, short construction period, low cost, and less impact on the surrounding environment.

The invention provides a soft soil tunnel steel arch mounting device and a using method thereof. The soft soil tunnel steel arch mounting device comprises a plurality of bottom plates, lifting mounting tables are arranged on the bottom plates, jacking devices are arranged between the bottom plates and the mounting tables, compacting devices are arranged at the bottoms of the bottom plates, each compacting device comprises a settlement sensing device, a jacking device and a jacking rod, and the jacking rods are mounted at the bottoms of the bottom plates. When the bottom of the bottom plate settles, the solid agent extends into the air bag to generate air and increase the pressure of the jacking device so as to fill the bottom of the bottom plate, inclination of the whole device caused by settlement is avoided, and meanwhile, jacking force of the jacking device is transmitted to the bottom plate through the jacking rod so that the bottom plate can bear supporting force of the bottom. And the whole device is further prevented from inclining. A gap between the bottom plate and the tunnel when the tunnel steel frame is installed is avoided, and the phenomena that in the long-term use process of the tunnel, the tunnel foundation is prone to sinking, the overall structure deforms or collapses, the bearing capacity is reduced, and the stability of the tunnel is affected are avoided.