144results about How to "Guaranteed size" patented technology

The invention provides a karst foundation model test block preparation device and a test method, belongs to the technical field of physical property test analysis, and is used for solving the problem that a karst model with a cavity structure is difficult to cast inside by a traditional model test block preparation technology in the prior art. Specifically, the device comprises a model frame with an opening in the top and a reinforcing structure arranged on the periphery of the model frame; the device further comprises a cavity reserving device, the cavity reserving device is located in the model frame and does not make contact with the wall face of the model frame, rock mass similar materials are poured into the model frame to form a karst foundation model test block, and after pouring is completed, the reserving device forms a cavity with an arc-shaped top face in the karst foundation model test block. A cavity space for simulating a karst hole is constructed in the model test block, the problem that a hole structure is difficult to form in the model test block through a traditional preparation technology is effectively solved, and powerful support is provided for deeply researching a karst foundation instability mode and a karst foundation instability process.

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

The invention relates to the technical field of batteries, in particular to a battery cell cover plate and a battery cell. The battery cell cover plate comprises a cover plate main body provided with a mounting hole; the pole is arranged in the mounting hole; a connecting hole is formed in the riveting piece, and one end, extending out of the mounting hole, of the pole is riveted with the connecting hole, so that part of the pole forms a material expansion part; the preset length size of the riveting piece in the first direction is M, and the unit is mm; the preset width size in the second direction is N, and the unit is mm; the radial size of the part, used for containing the material expanding part, of the connecting hole is d, and the unit is mm; (M-d) / (N-d) < = 8. According to the invention, the condition that the circumferential edge of the riveting piece is warped can be effectively avoided, so that the problem that the flatness is out of tolerance after the riveting piece and the pole are assembled is solved, the size and shape tolerance of the assembled pole meet the requirements, the reliable riveting of the pole and the riveting piece is ensured, the yield of the battery cell cover plate and the battery cell is improved, and the production cost is reduced. The use safety of the battery cell is ensured.

The invention discloses automatic feeding equipment for a polyurethane prepolymerization reaction and a preparation process, and belongs to the field of polyurethane preparation. Comprising a reaction kettle, a feeding shell is mounted at the top of the reaction kettle, and a solution cavity is formed in the feeding shell; a driving motor is mounted at the top of the reaction kettle; a heat conduction valve plate is mounted in the shell of the reaction kettle; a sampling tube is arranged at the bottom of the reaction kettle, a blanking detection opening is formed in the bottom of the sampling tube, guide strips which are symmetrically distributed are mounted at the bottom of the blanking detection opening, and the guide strips and the axis of the sampling tube are arranged in the same direction; a sampling box is mounted on the guide strip, a closed elastic piece is mounted between the guide strip and the reaction kettle, and a steering plate is mounted at the connecting position of the sampling tube and the reaction kettle; when the sampling box is installed on the guide strip, the sampling box is suitable for extruding the closing elastic piece which is suitable for abutting against the steering plate. During sampling, the sampling box is installed, the internal feeding effect of the sampling pipe is synchronously achieved, sampling is convenient and fast, and pipeline residue waste is reduced.

The utility model belongs to the field of vehicle sheet metal part forming and manufacturing, and provides a novel steel plate negative angle bending die which comprises an upper die plate (1), a lower die plate (9), a male die (4), a fixed female die (10) and a movable female die (11), the upper portion of the male die (4) is T-shaped and clamped into a space formed by two male die fixing plates (5), the section of the lower portion of the male die (4) is provided with two round corners, and the lower portion of the male die (4) is provided with two round corners. The fixed female die (10) is provided with two movable female dies (11), each movable female die (11) is in a notch disc shape, the movable female dies (11) are embedded into the fixed female die (10), the bottom of the male die (4) can be embedded into notches in the movable female dies (11), and a gap between the lower portion of the male die (4) and the inner walls of the notches of the movable female dies (11) can accommodate the thickness of a steel plate. According to the utility model, one set of die can complete two processes of production; the production efficiency of products is effectively improved, the material size can be effectively guaranteed, and the problems of springback and cracks are solved.

The invention provides a projection lamp and a vehicle. The projection lamp comprises a shell with a light emitting hole and a light emitting assembly. The light emitting assembly comprises a light source, a light mixing lens, a shading piece, a micro lens array and an outer lens arranged at a light emitting hole which are sequentially arranged in the light emitting direction; the number of the light sources is multiple, each light source can emit light of various different colors, the light mixing lens is provided with multiple dimming units, the multiple dimming units correspond to the multiple light sources in a one-to-one mode, and each dimming unit is provided with a light mixing part facing the corresponding light source and a light condensing part back to the corresponding light source; the shading piece is provided with a plurality of light emitting channels corresponding to the dimming units one to one. According to the projection lamp disclosed by the invention, the plurality of light sources and the light mixing lens which can emit light of various colors are arranged, so that the light of various colors is mixed and condensed by the light mixing lens and then correspondingly emitted through the plurality of light emitting channels on the shading piece, the micro-lens array and the outer lens; therefore, colorful dynamic patterns can be formed through projection.

The invention discloses a machining tool and method for a positioning hole in the end face of a thin-wall part, and belongs to the field of machining. The machining tool comprises a machining table and a positioning assembly. The machining table is provided with a plurality of sliding grooves. The positioning assembly comprises a positioning seat, a plurality of bottom pressing modules and a plurality of top pressing modules, the positioning seat is placed on the machining table, an outer flange is arranged at the bottom of the positioning seat, each bottom pressing module comprises a first sliding block, a first supporting column and a first pressing plate, the first sliding blocks are slidably inserted into the sliding grooves, the first supporting columns are placed on the machining table, and the first pressing plates are arranged on the first supporting columns. Each top pressing module comprises a second sliding block, a second supporting column, a second pressing plate and a connecting rod, the second sliding blocks are slidably inserted into the sliding grooves, and the second supporting columns are placed on the machining table. According to the machining tool for the positioning hole in the end face of the thin-wall part, the thin-wall part is not prone to deformation in the actual machining process, and the dimensional tolerance and the form and location tolerance of the thin-wall part are guaranteed.

The utility model discloses a camshaft bowl-shaped plug automatic assembling system which comprises a machine frame, a first air cylinder is fixedly arranged on the outer wall of the machine frame, an ejector block is fixedly arranged at the output end of the first air cylinder, a bowl-shaped plug assembling mechanism is arranged on the inner side of the machine frame, and the bowl-shaped plug assembling mechanism comprises a bowl-shaped plug bin, a bowl-shaped plug pushing unit and a bowl-shaped plug discharging unit. The bowl-shaped plug bin is fixedly arranged on the inner side of the rack and used for containing bowl-shaped plugs, the bowl-shaped plug pushing unit is arranged below the bowl-shaped plug bin, and the bowl-shaped plug discharging unit is arranged at the bottom end of the bowl-shaped plug bin. The second air cylinder drives the material pushing block to move forwards to the specified position, the bowl-shaped plug falls onto the material pushing block, the second air cylinder drives the material pushing block to return to the assembling position, the output end of the first air cylinder drives the ejector block to move forwards, and then the cam shaft is driven to move forwards to be assembled with the bowl-shaped plug. The consistency requirements of the product size, the relative position and the like are accurately guaranteed, and the production efficiency and the product protection mechanism are greatly improved.

The invention relates to a filter, a radio frequency front-end module and electronic equipment, the filter comprises a piezoelectric substrate, a first reflecting grating and two interdigital transducers, the first reflecting grating and the two interdigital transducers are arranged on the surface of the piezoelectric substrate, and the two interdigital transducers are respectively arranged on two opposite sides of the first reflecting grating; the first reflecting grating comprises a first finger strip, a second finger strip and a third finger strip which are connected, and the first finger strip and the second finger strip are arranged on the two sides of the third finger strip in the first direction; wherein the distance between the central axis of the third finger strip adjacent to the first finger strip and the central axis of the adjacent first finger strip is a first distance, the distance between the central axis of the third finger strip adjacent to the second finger strip and the central axis of the adjacent second finger strip is a second distance, and the first distance is not equal to the second distance. According to the filter disclosed by the invention, the first interval is unequal to the second interval by adjusting the intervals among the first finger strip, the second finger strip and the third finger strip in the first reflecting grating shared by the two interdigital transducers, so that the Q value of the filter disclosed by the invention is improved.

The invention discloses a composite die forging process for a large wind power gear blank. The composite die forging process comprises the following steps: sawing a bar according to process requirements; then, the bar material is heated; then the heated bar is taken out and placed between V-shaped anvils to be slightly pressed and drawn out, and then the bar is placed on a flat anvil to be upset; then the upset bar is inverted and drawn out, the drawn-out bar is upset vertically, and a cake blank is formed; finally, punching the cake blank to form an annular blank, and finishing the outer circle and the height according to the process size; then, the annular blank is heated; and finally, putting the heated annular blank into a die forging die, and carrying out die forging to obtain the required formed forge piece. According to the large wind power gear blank composite die forging process, the composite process of free forging and closed die forging is adopted, materials become more uniform and compact through free forging, and compaction and welding of defect areas and surrounding materials are facilitated; the closed die forging forming efficiency is high, the size and performance consistency of forgings produced in batches is good, batch production of large-size gear blanks is achieved, and the production efficiency is high.

The application discloses a heat treatment method of a titanium alloy material for an aviation aircraft, and comprises the following steps: S1, heating forging; S2, die forging; and S3, double annealing heat treatment. The heat treatment method optimizes and adjusts the heat treatment process in the preparation process of the TC21 titanium alloy, mainly optimizes and adjusts the cooling mode, the holding time and other parameters of the double annealing, so that the cooling speed is adjusted, the secondary lamellar or spherical alpha phase is obtained in the first annealing, the acicular alpha phase is obtained in the second annealing, the strength of the titanium alloy is improved through the content of the alpha phase, and the prepared TC21 titanium alloy meets the high performance requirements of strength greater than or equal to 1200 MPa, yield greater than or equal to 1100 MPa and A greater than or equal to 8.

The embodiment of the invention provides a hyper-parameter determination method and device of an image processing model and electronic equipment, and relates to the technical field of deep learning, and the method comprises the steps: obtaining an image size of a sample image used for training the image processing model, and taking the image size as a target sample size; according to a first association relationship between a pre-established sample size set and an input size set, determining an input size associated with the target sample size as the size of an input image of the image processing model; calculating the batch size of the training image processing model according to the determined size of the input image and the size of a storage space allocated for the image processing model in the equipment for training the image processing model; and calculating the number of iterations of the training image processing model based on the specified information. According to the scheme, the efficiency of determining the hyper-parameters of the image processing model can be improved.

The invention relates to a double-track linear production process of a solid-state battery tab, which is sequentially provided with a discharging deviation rectifying device, a leveling guide preheating device, a glue pulling and sticking device, a hot pressing device, at least one internal heating device, a high-frequency device, a cold pressing device, a shaping device, a material pulling device, a material pressing device, a cutting device and a chamfering device from front to back, the discharging deviation rectifying device adopts multi-track discharging and comprises a discharging assembly and a guiding assembly, the discharging assembly is independently arranged on the front side of the guiding assembly, the guiding assembly is arranged on the mounting platform, a rubber dividing and cutting device is arranged between the internal heating device and the high-frequency device, and a double-piece positioning device is arranged between the cutting device and the chamfering device. Two metal belts can be discharged and guided at the same time, the metal belts sharing the adhesive tape are subjected to adhesive dividing and cutting at the adhesive dividing and cutting station, and meanwhile redundant adhesive shoulders of adhesive tabs are cut off; and the two plate-type tabs are initially positioned at the same time before chamfering, so that the chamfering precision is improved.

The invention relates to a redressing device suitable for soft and hard staggered and high-abrasiveness stratums. The redressing device comprises a lower connector, a columnar body, a blade and an upper connector which are sequentially arranged from bottom to top. The cutter wings are evenly distributed on the columnar body in the axis direction of the columnar body, cooling grooves are formed in the middles of the cutter wings and divide the cutter wings into front main cutter wings and rear auxiliary cutter wings, the adjacent cutter wings and a well wall annulus form chip removal grooves, and the chip removal grooves are communicated with the front main cutter wings and the rear auxiliary cutter wings. Active reaming teeth and resistance-reducing gauge teeth are uniformly arranged on the front main blade, and active reaming teeth, resistance-reducing gauge teeth and active gauge teeth are uniformly arranged on the rear auxiliary blade. The reamer can effectively remove chips and dissipate heat, the overall service life of the reamer is prolonged, the borehole quality is effectively guaranteed, and friction resistance is reduced.

The utility model discloses brush hair trimming equipment for cosmetic brush production, which belongs to the technical field of cosmetic brush production and comprises a support plate, a support block is integrally and fixedly connected onto the support plate, a limit groove is arranged on the support block, a support shell is integrally connected onto the support plate, and an adjusting plate and a toothed plate are slidably connected into the support shell. Under the combined action of a supporting block, a limiting groove, a first motor, a gear, a toothed plate, a pressing plate and the like, a plurality of brushes for bundling ropes are placed in the limiting groove, the first motor works to drive the pressing plate to descend, bristles in the limiting groove are fixed through a pressing block, and under the combined action of a first electric push rod, a cutting board and the like, the bristles in the limiting groove are cut off. The tail parts of a plurality of fixed bristles can be sheared; and under the action of a second motor, the position of a baffle can be adjusted, under the action of a second electric push rod, the position of bristles can be adjusted, and it is guaranteed that the size of the bristles obtained after shearing meets the requirement.

The invention discloses a high-strength seamless line pipe for conveying X60-grade high-pressure hydrogen and a manufacturing method of the high-strength seamless line pipe. The high-strength seamless line pipe comprises the following components in percentage by weight: 0.06 to 0.14 percent of C, 0.10 to 0.4 percent of Si, 0.85 to 1.30 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.005 percent of S, 0.1 to 0.8 percent of Mo, 0.02 to 0.06 percent of V, 0.02 to 0.05 percent of Nb, 0.02 to 0.04 percent of Ti, 0.6 to 1.5 percent of Cu and the balance of Fe and other inevitable impurities. The elements also need to simultaneously meet the following conditions: 1 / 3V + 1 / 2Nb + 1 / 4Ti is less than or equal to 0.045%; the yield strength of the obtained seamless line pipe is 420-515 MPa, the tensile strength is 535-650 MPa, and the transverse or longitudinal full-size impact energy at-20 DEG C is larger than or equal to 220 J; the H2 / N2 elongation and the reduction of area in the 15 MPa H2 environment are both greater than or equal to 93%, and the fracture toughness is greater than or equal to 110 MPa / m < 2 >.

The invention relates to a preparation method of multi-layer framework high-entropy ceramic nano aerogel, and belongs to the technical field of aerogel materials. The method comprises the following steps: adding metal oxide nanoparticles and inorganic acid into deionized water, and uniformly stirring and mixing at room temperature to obtain an acidic dispersion liquid; the method comprises the following steps: carrying out high-temperature and high-pressure hydrothermal reaction on an acidic dispersion liquid to prepare nanocrystal wet gel, pressing the nanocrystal wet gel into a wet gel thin layer with a certain thickness, flatly laying a fiber-reinforced grid fabric on the wet gel thin layer, repeating the step for several times to obtain multi-layer composite wet gel, and carrying out pressure maintaining on the multi-layer composite wet gel to obtain water-based multi-layer framework wet gel; and placing the water-based multi-layer framework wet gel in a low-surface-tension mixed solvent for solvent exchange to obtain low-surface-energy solvent-based multi-layer framework wet gel, and performing drying, high-temperature heat treatment and quenching on the low-surface-energy solvent-based multi-layer framework wet gel. The nano-skeleton of the high-entropy ceramic nanocrystal aerogel is thick and strong, and the problems of collapse, volume shrinkage and heat insulation failure of the nano-skeleton of the aerogel can be effectively avoided.

The micro-low gravity gas-magnetic hybrid suspension unit comprises a shell, a stepped hole is formed in the shell in the axial direction of the center, a bearing column, a permanent magnet, a circular plate with a main gas supply groove and an inner porous medium are sequentially arranged in the shell from bottom to top, and the radial peripheral sizes of the inner porous medium, the circular plate and the permanent magnet are consistent; a magnetic isolation circular ring is embedded between the permanent magnet and the shell, an auxiliary air supply groove is formed in the upper-layer step face of the step hole, an outer porous medium is glued to the upper face of the auxiliary air supply groove, the upper surfaces of the magnetic isolation circular ring, the inner porous medium, the outer porous medium and the shell are the same plane, and the plane is covered with a working plane plate. Air supply holes sequentially penetrating through the auxiliary air supply grooves, the magnetic isolation circular rings and the main air supply grooves are formed in the outer portion of the shell in the radial direction of the shell. The ultimate bearing capacity of the gas-magnetic hybrid suspension unit can be increased, and the transverse resistance can be weakened.

The utility model discloses a static reed for a vacuum relay, a static reed assembly and the vacuum relay, and belongs to the field of vacuum relays. The static reed for the vacuum relay comprises a movable through hole and a positioning groove arranged on at least one side of the movable through hole, the positioning groove is arranged on a first surface of the static reed, and the first surface is a surface intersected with the extension direction of the axis of the movable through hole; the groove bottom of the positioning groove inclines in the direction away from the first surface in the first direction so that the distance between the groove bottom of the positioning groove and the first surface can be gradually increased in sequence in the first direction, or the groove bottom of the positioning groove inclines in the direction close to the first surface in the first direction so that the distance between the positioning groove and the first surface can be gradually increased. The distance between the groove bottom of the positioning groove and the first surface is gradually decreased in the first direction, and the first direction is the direction in which the positioning groove points to the movable through hole. Therefore, the static feeler lever can be pre-positioned through the positioning groove, displacement caused by shaking of the static feeler lever before the static feeler lever is fixed in the positioning groove is avoided, and the assembly precision is improved.

The glass fiber reinforced plastic correction device is characterized in that the glass fiber reinforced plastic correction device comprises a top plate (1), a pressing block (3), a positioning plate (4) and a heating plate (5), the four ends of the bottom of the top plate (1) are welded to the tops of four supporting rods (6), and the bottoms of the four supporting rods (6) are welded to a bottom plate (7); the four ends of the positioning plate (4) are arranged outside the supporting rods (6) in a sleeving mode, the supporting rods (6) are welded to the positioning plate (4), the heating plate (5) is arranged below the positioning plate (4), the top of the heating plate (5) is tightly attached to the positioning plate (4), and a heating coil is arranged in the heating plate (5). Four hydraulic rods (2) are installed at the bottom of the top plate (1), two pressing blocks (3) are arranged below the four hydraulic rods (2), and the telescopic ends of the bottoms of every two hydraulic rods (2) are welded to the top of one pressing block (3). According to the invention, the problems that the thickness of the product is inconsistent, the shrinkage stress of each area is different, and the shape and size of the product are changed due to the release of residual stress are solved.

The utility model discloses an axle suspension box steel casting for an internal combustion locomotive, which comprises an outer mold, a pouring gate mold and an outer chilling block, semi-ring molds are arranged at the left end and the right end of the outer mold, a downsprue positioning plate is arranged on the surface of the outer mold, an accessory mold is arranged on the surface of the outer mold, an inner chilling block is arranged in the accessory mold, the pouring gate mold is arc-shaped, and the pouring gate mold is attached to the outer mold. A third loam core is arranged between the pouring gate mold and the outer mold, the multiple outer chilling blocks are annularly arranged on the surface of the semi-ring mold, and through the outer mold, the pouring gate mold and the third loam core, the size and the smooth and clean surface quality of the axle suspension box can be effectively guaranteed, and the hot crack phenomenon generated when molten metal solidifies and shrinks is effectively reduced; through the direct pouring gate positioning plate and the pouring gate mold, rapid mold filling of molten metal can be guaranteed, the good feeding effect is achieved, shrinkage cavities and shrinkage porosity can be effectively prevented, the internal structure of the axle suspension box is compact, the defects of sand inclusion, air holes and the like in the axle suspension box are few, and the production quality of the axle suspension box is improved.

The invention provides a bearing platform construction method under the condition of limited space of a foundation pit, which comprises the following steps of: inserting and driving a steel sheet pile support at the boundary of the foundation pit, then installing a double-sided steel template at the limited side of the working space after the foundation pit is excavated, then carrying out bearing platform steel bar construction, pre-burying an inclined opposite-pull pipe in the construction process, and firstly penetrating an opposite-pull steel rope into the inclined opposite-pull pipe, after the single-face steel formwork on the side with the sufficient working space is in place, one end of the opposite-pulling steel rope is fixed to the single-face steel formwork, the other end of the opposite-pulling steel rope is connected with a flange of the double-face steel formwork, then the opposite-pulling steel rope is fastened and pulled, and after the steel formwork is fixed, bearing platform pouring construction is conducted, then the single-face steel formwork is dismantled firstly, and after half of a foundation pit is backfilled, pouring construction is conducted. And then the double-face steel formwork is dismantled. A double-face steel formwork structure is adopted on the limited side of the operation space, the double-face steel formwork on the limited side of the operation space and the single-face steel formwork on the sufficient side of the operation space are tied and fixed through a method of oppositely pulling the steel wire ropes, in addition, by means of the mode of pre-burying the inclined oppositely-pulling pipes, on one hand, the oppositely-pulling steel wire ropes can be limited, and on the other hand, when the double-face steel formworks are dismantled, the double-face steel formworks can be dismantled; according to the construction method, under the condition that the space of a foundation pit is limited, the installed steel formworks can still be oppositely pulled, the steel formworks can be conveniently removed, and the size and quality indexes of the bearing platform are well guaranteed.

The present invention relates to the field of autonomous driving, and in particular to a collision detection method, device, electronic device and storage medium for a vehicle autonomous driving system. The method comprises: obtaining a first target position frame diagram corresponding to a target vehicle in a target coordinate system; obtaining a second target position corresponding to each vertex in a target obstacle in the target coordinate system; detecting whether a line between any two adjacent second target positions intersects with the first target position frame diagram; when a line between any two adjacent second target positions intersects with the first target position frame diagram, determining that a collision occurs between the target vehicle and the target obstacle. The above method does not simplify the shape and size of the target obstacle, thereby ensuring the accuracy of the shape and size of the target obstacle determined according to the second target position corresponding to each vertex in the target obstacle. In addition, the accuracy of the result of the collision between the target vehicle and the target obstacle can be ensured.

The invention discloses a micron-order turning automatic tool receiving control method based on a vibration signal, and provides a linkage turning precision machining method for a narrow cavity of a disc part aiming at the machining difficulties of chip extrusion, tool hitting, interference collision and the like of a tool in the machining process of the narrow cavity of the disc part. A linkage turning precision machining scheme for a narrow cavity is effectively completed, the method comprises the working procedure steps of vibration sensor installation, system testing, signal extraction, machine tool communication and feedback action, part machining verification and the like, and the whole technological process design and implementation of linkage turning, tool design, program design and parameter selection are involved. The machining process of the parts of the family is stable and efficient, and the technical capacity and manufacturing maturity of batch production and stable delivery are achieved.

The utility model discloses a cavity filter with anti-loose debugging screws. The cavity filter comprises a cavity, a cover plate, a resonator, an input / output connector, a plurality of tuning screws and a plurality of nuts, the resonator is arranged in the cavity; the cover plate is arranged on the cavity and seals the open end of the cavity, a plurality of first threaded holes are formed in the cover plate, a plurality of first shaping grooves are formed in the outer side wall of the cover plate, the first shaping grooves are evenly distributed in the peripheral sides of the first threaded holes, and the stress directions of the first shaping grooves point to the centers of the first threaded holes; the input and output connector is arranged on the cavity and is connected with the resonator; the tuning screw rod is in threaded connection in the first threaded hole, and at least part of the tuning screw rod extends into the cavity and is arranged opposite to the resonator; the nut is arranged on the tuning screw and abuts against at least part of the first shaping groove. By means of the structure, it can be guaranteed that the size and flatness of a product meet the requirements, the nut and the debugging screw can be effectively prevented from loosening, and very good practicability is achieved.

The invention relates to an aluminum alloy soldering lug and a preparation method and application thereof, and belongs to the technical field of welding. The aluminum alloy soldering lug disclosed by the invention is prepared from the following elements in percentage by mass: 3.0 percent to 4.5 percent of Si, 2.0 percent to 3.5 percent of Fe, 0.8 percent to 1.2 percent of Mg, 0.10 percent to 0.25 percent of Zr, 0.05 percent to 0.15 percent of Sc, 0.02 percent to 0.08 percent of Er, 0.05 percent to 0.12 percent of Ti, 0.005 percent to 0.02 percent of B and the balance of Al and other inevitable impurities. The mass ratio of (Zr + Sc) / Fe is 0.08 to 0.15; the mass ratio of Mg to Si is 0.25 to 0.35; the mass ratio of (Fe + Si) to (Zr + Sc + Er) is 20-25; the problems that laser welding aluminum alloy is thick in weld joint structure and uneven in performance, and a dissimilar material welding interface is embrittled are fundamentally solved.

This invention discloses an automated welding production line and welding method for L-shaped ribbed steel bridge deck unit joints, relating to the field of bridge welding manufacturing technology. The automated welding production line includes L-shaped ribbed steel bridge deck units; gantry rails spaced at intervals; a multi-functional gantry workstation mounted on the gantry rails; a vision-teaching collaborative robot located inside the L-shaped ribbed steel bridge deck unit; and a tracked welding workstation located outside the L-shaped ribbed steel bridge deck unit. The automated welding method includes the following steps: S1: assembly and positioning; S2: hoisting and fixing; S3: equipment deployment; S4: first teaching welding; S5: second teaching welding; S6: equipment transfer; S7: repeating steps S2-S6 until all U-shaped groove welds of the T-shaped transverse ribs and partition joints of all L-shaped ribbed steel bridge deck units are completed. This invention solves the technical problems of low welding efficiency and unstable welding quality in existing L-shaped rib joints.

This utility model discloses an aluminum profile mold with hooks, including a mold body, a backing plate on the mold body, and a solid working belt and a hook working belt for extruding the aluminum profile between the backing plate and the mold body. The solid working belt and the hook working belt are connected within the mold body. The fluid inlet end of the solid working belt is provided with a solid feed cavity to prevent the flow rate of the solid part from being too fast during the extrusion process. The edge of the solid feed cavity has a stepped structure. The feed end of the hook working belt is provided with a hook feed cavity to accelerate the fluid flow rate of the hook part. This utility model improves the production quality of aluminum profiles by specifically designing the structure of different parts of the mold, adding a backing plate to enhance the mold rigidity, using a stepped feed cavity and an extended working belt to slow down the flow rate of the solid part, and using a sloped and enlarged feed cavity to accelerate the flow rate of the hook part.

This invention relates to the field of positioning technology for thin-walled workpieces, and discloses a positioning device for preventing offset of thin-walled workpieces based on CNC machine tools. It aims to solve the technical problems of easy deformation during positioning of thin-walled workpieces and poor adaptability of traditional clamping blocks. The device includes a CNC machine tool body, a rotating chuck, an adjustment drive assembly, a push rod assembly, and a tensioning positioning assembly. A frustum-shaped push block converts rotational motion into linear motion via a screw and nut mechanism. This, in conjunction with a limiting assembly, drives the push rod assembly to synchronously and uniformly extend and retract radially, causing a spring steel sheet with a pre-positioned section to achieve curvature self-adaptation. The pre-positioned section is a sliding compensation arc surface section, adapting to thin-walled pipes of different diameters while maintaining surface contact. The device has two sets of staggered tensioning positioning rings, forming a full-circumferential, gapless support for the inner wall of the pipe. This device avoids stress concentration problems caused by line contact, effectively preventing deformation of thin-walled pipes, balancing positioning firmness and deformation prevention requirements, and significantly improving the processing qualification rate and production efficiency of thin-walled pipes.

The utility model discloses a small line diameter petal spring hot press setting device relates to petal spring production and processing technical field, solved the problem that petal spring is easy to have thermal shrinkage deformation in annealing process. The hot press setting device includes: install lower die install lower die and include mounting panel and a plurality of vertical fixed limit rod on mounting panel, a plurality of limit rods can respectively along the outer contour and the inner contour distribution of petal spring, to form the limiting area for limiting a plurality of superimposed petal spring between a plurality of limit rods, press mechanism, press mechanism includes a plurality of can go up and down the press needle, a plurality of press needles all are located the just above of limiting area, and along the locus shape distribution of petal spring. The device can be compacted and positioned a plurality of superimposed petal spring on install lower die, make petal spring be in the stress annealing of laminated pressure and go, can completely eliminate the deformation in the heating process, guarantee product quality, realize batch production.