75results about How to "Avoid holes" patented technology

The invention provides an injection mold convenient to demold, and relates to the technical field of injection molds, the injection mold convenient to demold comprises a base, a supporting frame, a lower mold, a pushing mechanism and an upper mold, and a turnover mechanism capable of driving the lower mold to turn over when the upper mold vertically moves is arranged on the inner wall of the supporting frame; a feeding assembly capable of enabling a hot melting material to fill the lower mold from bottom to top so as to prevent the hot melting material from sputtering is arranged between the upper mold and the lower mold, and a demolding mechanism used for ejecting a formed product is further arranged at the bottom of the lower mold. According to the injection mold, when a hot melting material is poured, the problem that holes are formed in a formed product due to the fact that the hot melting material is sputtered to generate bubbles can be prevented, an opening of the lower mold can face downwards during demolding, the contact area of an ejection part and the bottom of the product can be increased, the product can be cooled while being ejected, and the product quality is improved. Therefore, the demolding speed can be increased, and the product quality can be improved.

The invention relates to the technical field of rock-soil anchoring engineering, in particular to a tension-compression composite type anti-floating anchor rod which comprises a water stop ring, an oval bearing body, an end cap, a threaded steel bar, a first isolation sleeve and an assembly type support, the water stop ring is installed at a drilling hole opening, and the threaded steel bar is sequentially connected with the oval bearing body, the assembly type support and the end cap from top to bottom. The bottoms of the twisted steel bars are fixedly mounted in the end caps; the oval bearing body comprises a bearing plate and a bearing cap which are fixedly connected, through rib penetrating holes are formed in the bearing plate and the bearing cap, the horizontal section of the bearing plate is oval, and a convex face is arranged on the surface of the bearing plate; by using the oval bearing body, the pressure bearing area is reduced, and the accumulation risk of muck on the bearing body can be obviously reduced; the oval bearing body adopts the convex surface design, when part of muck falls into the drill hole and falls onto the end face of the oval bearing body, the muck easily slides off from the convex surface, and accumulation is avoided.

The invention discloses a semiconductor device and a preparation method thereof, a power module, a power conversion circuit and a vehicle. The semiconductor device comprises a semiconductor structure, the semiconductor structure comprises a semiconductor body and a first dielectric layer, and the first dielectric layer is located on one side of the semiconductor body; a trimming conductive contact hole is formed in the first dielectric layer, and an opening, close to one side of the semiconductor body, of the trimming conductive contact hole is smaller than an opening, away from one side of the semiconductor body, of the trimming conductive contact hole; the conductive layer is located on the side, away from the semiconductor body, of the first dielectric layer, fills the trimming conductive contact hole and penetrates through the trimming conductive contact hole to be electrically connected with the semiconductor structure. According to the technical scheme provided by the embodiment of the invention, the filling quality of the conductive layer in the conductive contact hole is improved.

The invention provides a complex reactor core collaborative design system suitable for a research reactor, relates to the technical field of reactor core design systems, aims to improve the reliability of reactor core design, and comprises a model library module, a model database module, a model database module and a model database module, the model library comprises a reactor model library and an irradiation device model library; the interactive interface module is used for realizing interactive operation; the reactor core scheme design module is used for carrying out autonomous initialization design on a reactor core, and solving the problem of fuel assembly and target position loss caused by pore channel opening operation and the area demand of a newly added beryllium aluminum assembly caused by pore channel closing operation; and the reactor core scheme evaluation module is used for evaluating the reactor core. The method has the advantages of being intelligent in design, easy to operate and reliable in design quality.

The invention belongs to the technical field of tunnel construction, and relates to a construction method for crack resistance of plateau tunnel lining concrete, which comprises the following steps: S1, screening of concrete raw materials: screening all raw materials according to the requirements of crack resistance of plateau tunnel lining concrete and the following requirements; s2, according to the anti-cracking performance requirement of the plateau tunnel lining concrete, the raw materials screened in the step S1 are adopted, and anti-cracking concrete is formed according to the set mixing proportion; s3, preparation before concrete pouring; s4, the concrete is put into a mold, poured and vibrated; and S5, concrete curing. According to the method, the concrete mixing proportion is designed, the concrete is poured in a mold, and the vibration and curing temperature and humidity in the concrete pouring process are controlled, so that the concrete shrinkage rate is reduced, and the anti-cracking performance of the concrete is improved.

The invention discloses a PCB processing technology for printing multi-layer stepped thick gold plating, and belongs to the field of multi-layer PCB processing. The PCB processing technology for printing multi-layer stepped thick gold plating comprises the following steps: designing a PCB, and carrying out hierarchical planning; overlapping and laminating the insulating material and the copper foil layer according to the design, and performing interlayer alignment by using an optical alignment system; laser drilling equipment is adopted to drill holes in the laminated plate for electrical connection and hole penetrating; a chemical nickel-copper plating process is used, and plating is carried out in the hole wall; forming a circuit pattern on the surface of the plating layer by using a photoetching technology; redundant materials are removed by using an etching technology; plating thick gold on the copper layer by using an electroplating technology; and measuring the thickness of the gold-plated layer, assembling the processed PCB, and carrying out electrical test. In the laminating process, the optical alignment system is used for carrying out interlayer alignment, so that the alignment precision is ensured, and the problems of signal transmission loss, short circuit or open circuit and the like are avoided.

The invention provides a chip packaging structure and a preparation method thereof, a terminal device and a chip packaging substrate, and the chip packaging structure comprises a substrate which is provided with a first side and a second side which are oppositely disposed in a first direction; the substrate comprises at least one first groove and a plurality of through holes, an opening of the first groove is located in the first side, and the through holes penetrate through the bottom wall of the first groove in the first direction; the at least one first chip is located in the first groove, and the surface, provided with pins, of the first chip faces the second side; the at least one second chip is located on the second side of the substrate, and the surface, provided with pins, of the second chip faces the first side; the first wiring layer is located on the first side of the substrate, and the first wiring layer is electrically connected with the pins of the first chip; the second wiring layer is located on the second side of the substrate, and the second wiring layer is electrically connected with the pins of the second chip; and a connection line in the through hole and electrically connected with the first wiring layer and the second wiring layer. Stacking of a plurality of chips is achieved, and holing in the chips can be avoided.

The invention discloses a full-automatic PTEE film stretching and sintering machine and a stretching and sintering method, and relates to the technical field of PTEE film stretching and sintering machines, the full-automatic PTEE film stretching and sintering machine comprises a sintering and heating bin, conveying pieces, a film to be stretched, a first assembly, a second assembly and a third assembly, the conveying pieces are symmetrically arranged in an inner cavity of the sintering and heating bin, and the film to be stretched is located in the middle of the conveying pieces; the first assembly and the second assembly are located on the same vertical plane, and through the design of the stabilizing pipe and the pushing piece, solution conveying work can be completed when the first assembly and the second assembly work; the problem that whether the conveying device and the stretching device are not flush or not and consequently the thin film is stressed unevenly can be ingeniously monitored indirectly through movement of the push piece in the stabilizing pipe; the design of one group of parts with multiple functions obviously reduces the complex maintenance work and cost caused by the increase of the parts; the overall operation efficiency of the equipment is improved, and the production continuity is guaranteed.

The utility model relates to an electrocardio watch which comprises a bottom shell, a middle frame and a transparent watch cover, the bottom shell and the watch cover are arranged at the bottom end and the top end of the middle frame respectively, a control circuit board is arranged in the middle frame, a first electrode electrically connected with the control circuit board is arranged on the bottom face of the bottom shell, a second electrode is arranged on the upper surface of the watch cover, and the first electrode is electrically connected with the control circuit board. The second electrode comprises an upper electrode part located on the upper surface of the meter cover, a lower electrode part located in the middle frame and a connecting part, the two ends of the connecting part are connected with the upper electrode part and the lower electrode part respectively, and the lower electrode part is electrically connected with the control circuit board. According to the electrocardio watch, a structure used for installing the second electrode does not need to be independently arranged on the middle frame, the occupied space of the second electrode is reduced, the watch can be designed to be thinner, meanwhile, holes or protruding electrodes are prevented from being arranged on the middle frame, and the appearance integrity of the electrocardio watch is maintained.

The invention relates to an anoxic oxide ceramic material and a preparation method thereof. The preparation method comprises the following steps: pressing oxide ceramic powder into a green body; preheating the green body to reach a conductive temperature; turning on a power supply to flash-burn the oxide green body; after flash sintering is finished, the sintered oxide ceramic is crushed and sieved; carrying out secondary sintering in a low oxygen partial pressure environment; and maintaining for a preset time period to obtain the sintered oxygen-deficient oxide ceramic. According to the method, the oxide ceramic material is rapidly deoxidized by utilizing a flash sintering process, and the deoxidized powder is secondarily sintered in a low oxygen partial pressure environment, so that rapid preparation of the oxygen-deficient oxide ceramic material is realized, and a new thought for design and preparation of the oxygen-deficient oxide ceramic material is provided.

The invention discloses a cloth storage frame for glass fiber post-treatment and a use method of the cloth storage frame, and relates to the technical field of post-treatment unit cloth storage frames used in the glass fiber industry, in particular to the cloth storage frame for glass fiber post-treatment and the use method of the cloth storage frame for glass fiber post-treatment. The guide roller bracket comprises a bottom bracket and a sliding bracket; the sliding bracket is arranged at the upper end part of the cloth storage frame; at least three motors are arranged on the cloth storage frame, and the motors control the sliding support to axially ascend and descend along the cloth storage frame through a lifting mechanism; the sliding support is provided with a tilt angle sensor, and the tilt angle sensor and the motor are electrically connected to the control system. The cloth storage rack has the advantages that according to an existing cloth storage rack, the cloth storage lifting frame needs to be manually and regularly calibrated horizontally, and the parallelism and the levelness of the guide rollers need to be calibrated. The manual calibration mode not only is low in efficiency, but also is greatly influenced by the skill level of calibration personnel, so that the calibration precision and consistency are difficult to guarantee.

This utility model relates to a snap-fit ​​structure, a car door, and a vehicle. The snap-fit ​​structure connects an assembly and a door panel body, forming a cavity between the assembly and the door panel body. The snap-fit ​​structure includes a first connector and a second connector, both disposed within the cavity. The first connector connects to the assembly, and the second connector connects to the door panel body, with the first and second connectors engaging and securing each other. Compared to existing technologies, this utility model's snap-fit ​​structure snaps the assembly to the door panel body. In this structure, the first connector connects to the assembly, and the second connector connects to the door panel body, forming a cavity between them. Within this cavity, the first and second connectors snap together, connecting the assembly and the door panel body. The fact that both connectors are disposed within the cavity avoids opening holes in the door panel, maintaining the flatness of the door panel body.

An agricultural planting and seeding device, comprising a housing, a base and a seed taking device, the seed taking device is rotatably connected to the base, the housing and the base are connected by screws, the seed taking device comprises a seed taking seat, the seed taking seat is connected to a seed taking disc and an intermediate disc, the seed taking disc is slidably connected to a plurality of sliding blocks, the inner sides of the sliding blocks are respectively connected to a plurality of cam seat controls, the plurality of cam seat controls are respectively connected to a plurality of adjusting ring controls, the plurality of adjusting ring controls are connected to an adjusting seat, the outer sides of the sliding blocks are respectively connected to a plurality of movable heads, and the plurality of movable heads are connected to the seed taking disc. The seed taking head of the device can be adjusted, the cavity phenomenon caused by wear can be compensated, and different sizes of seeds can be adapted.

The invention discloses a high-power connector with low resistance and high heat dissipation for quick connection, and relates to the field of connectors, the high-power connector comprises a support frame, reeds and busbar clamping bodies, the two busbar clamping bodies are assembled on the support frame, the busbar clamping bodies are integrally formed stamping parts, and the surfaces of the busbar clamping bodies are not provided with holes, so that the high-current passing capacity is ensured; a clamping space is formed between the two busbar clamping bodies, a reed is assembled between one end, far away from the clamping space, of each busbar clamping body and the supporting frame, a rear contact is formed at one end of each busbar clamping body, a front contact is formed at the other end of each busbar clamping body, and under the action of the reeds, the busbar clamping bodies are in contact with the supporting frame. The rear contacts of the two busbar clamping bodies are enabled to clamp the second busbar, the busbar clamping bodies are enabled to be unfolded by taking the rear contacts as rotating points, and the front contacts of the two busbar clamping bodies are enabled to clamp the first busbar, so that the problem of position errors of the first busbar and the second busbar caused by manufacturing tolerance or external reasons is solved, normal transmission of current is realized, and an abnormal interruption phenomenon is avoided.

The invention discloses a low-temperature co-fired ceramic three-dimensional packaging structure, which belongs to the technical field of semiconductors, and comprises a metal bottom plate, a ceramic bottom plate arranged at the center of the top of the metal bottom plate, a grouting opening formed in the peripheral section of the ceramic bottom plate, a ceramic middle clamping plate arranged at the top of the ceramic bottom plate, and a middle bracket arranged at the center of the top of the ceramic middle clamping plate. An embedded plate frame is arranged at one end of the middle bracket; according to the invention, the ceramic bottom plate is matched with the ceramic middle clamping plate and the ceramic top plate for linkage and mutual matching use, the slurry explosion grooves and the slurry overflow thin grooves are used for guiding ceramic slurry to be injected among the multiple groups of splicing plate bodies in a pressurized manner during a static pressure period, and areas which are easy to damage and have cavities among the multiple groups of splicing plate bodies are filled and reinforced; a static pressure process is matched with ceramic slurry to tightly adhere and fix a plurality of groups of plate bodies, so that holes among the plate bodies are effectively avoided, the connection strength among the plate bodies is improved, and the phenomena of cracks and internal damage caused by the influence of a use environment, temperature and other pressures are avoided.

The present invention proposes an underwater ejection experimental device for multi-scale ratio experiments, which belongs to the field of underwater ejection experiments. The invention solves the problem that the experimental device cannot carry out multi-scale ratio experiments and the first-level accuracy and repeatability cannot be guaranteed. It includes a base, on which a plurality of mounting holes are arranged, each mounting hole is used to install experimental modules with different scale ratios; the experimental module includes: a gas delivery module, connected to the mounting holes at corresponding positions; a high-pressure gas cylinder module, connected to the inlet end of the gas delivery module; and a launch tube module, connected to the outlet end of the gas delivery module for receiving the high-pressure gas launch projectile output by the high-pressure gas cylinder module; the launch tube module includes a launch tube, a sealing ring, a limiting ring, an air chamber, an air inlet and a drain, an air chamber is formed between the limiting ring and the bottom wall of the launch tube, and the air chamber is connected to the gas delivery module through the air inlet on the side wall of the launch tube. It is mainly used for underwater ejection experiments with multiple scale ratios.

The invention is applicable to the technical field of material preparation, and particularly relates to a method for constructing and forming a particle-reinforced aluminum-based composite material, which comprises the following steps: cutting a particle-reinforced aluminum-based composite material blank, and removing oxide skin; then selecting an aluminum alloy sheet with the same specification as the composite material bonding surface as a middle layer; and a plurality of composite materials containing the aluminum alloy middle layers are assembled according to large-size blanks or special-shaped part blanks and then packaged and sleeved for hot isostatic pressing, and the constructed and formed large-size or special-shaped aluminum-based composite material blanks can be obtained. The aluminum-based composite material is constructed and formed, and the problems that an existing aluminum-based composite material is difficult to prepare in a large size, and materials are wasted when large-size special-shaped parts are machined are solved. Compared with a traditional welding method which is difficult to perform high-strength connection on the particle reinforced aluminum-based composite material, the method has the advantages of no defect at the joint, high connection strength, improvement of the material utilization rate and easier realization of preparation of large-size part blank materials, and compared with a traditional welding method which is difficult to perform high-strength connection on the particle reinforced aluminum-based composite material.

The utility model discloses a piece counting conveying belt which comprises an installation frame, a belt roller, a belt and a main drive motor, safety optical gratings are fixedly installed on the two sides of the input end of the installation frame and located above the belt, counting sensors are installed on the two sides of the installation frame, the number of the counting sensors is two, and the counting sensors are located at the two ends of the installation frame respectively. The counting sensor located at the input end of the mounting rack is located on one side of the safety grating close to the output end of the mounting rack. Whether goods exist on the belt or not is detected through the safety optical grating, the possibility that a plurality of goods are placed on the mechanical arm within a certain range is reduced, the goods pass through the counting sensors after being conveyed to the outer side of the safety optical grating range and are counted through the counting sensors, and the two counting sensors are arranged for rechecking the number. The counting sensor located at the rear end ensures that the goods leave the belt, and counting errors are reduced.

This utility model discloses an edge-distributed perforated photovoltaic module, comprising: a laminate, on which a first battery string group, a second battery string group, and a third battery string group are disposed; the second and third battery string groups are connected in parallel and then in series with the first battery string group; the first battery string group includes multiple battery strings connected in parallel, and each battery string is divided into two parts connected in series, upper and lower, by a bus bar; the upper part of the first battery string group is connected to a first bypass diode, the lower part of the first battery string group is connected to a second bypass diode, the second battery string group is connected to a third bypass diode, and the third battery string group is connected to a fourth bypass diode; each bypass diode is respectively disposed near the corner of the laminate. This design avoids opening holes in the middle of the backsheet, reduces the risk of stress concentration, and thus solves the problem that opening holes in the middle area of ​​the backsheet easily leads to glass breakage, thereby improving the strength of the laminate.

The invention discloses a TSV solid-phase hole filling interconnection method and structure, and relates to the technical field of semiconductor packaging. The TSV solid-phase hole-filling interconnection method comprises the steps of S1, silicon through hole etching and deposition, S2, copper column insertion and fixation, S3, surface treatment and interconnection construction and S4, electrical testing and process feedback, a complex electroplating production line is abandoned, the through holes are filled through plastic deformation of the solid copper columns, the inherent hole and seam problems of an electroplating method are avoided, and the TSV solid-phase hole-filling interconnection method is suitable for large-scale production. The high-purity solid copper columns are high in mechanical strength and are tightly and mechanically interlocked with the inner walls of the through holes through plastic deformation, and the anti-fatigue capacity of the interconnection structure under the thermal cycle load is improved by combining the insulating layer and the barrier layer, so that reliable vertical interconnection is obtained, thermal expansion coefficient mismatch of copper and silicon is effectively avoided, and the reliability of the interconnection structure is improved. Stress is generated on the interface in the electroplating process and the subsequent thermal cycle.

The utility model discloses a hydrodynamic sliding bearing, which comprises a shaft sleeve, at least two rows of groove groups are arranged on the inner wall of the shaft sleeve, each groove group comprises a plurality of grooves parallel to each other, each groove is formed by combining a transverse groove and inclined grooves symmetrically arranged on two sides of the transverse groove, the transverse groove is connected at the intersection position of two inclined grooves, and the inclined grooves are connected with the shaft sleeve. The transverse groove is formed along the arc line of the inner diameter of the shaft sleeve, and one of the two inclined grooves extends to the edge of the shaft sleeve. The structure is more reasonable, the pressure distribution of a lubricating oil film can be better adjusted, and the using effect of the structure is improved.

This application belongs to the field of lighting equipment technology, and provides a lighting device that is convenient for light-sensor installation, including a housing, a lamp panel, a reflector, a light sensor, and a lampshade. The housing has a light-emitting hole; the lamp panel is installed inside the housing; the reflector is installed inside the housing and is used to reflect the light from the lamp panel to the light-emitting hole; the light sensor is installed on the lamp panel; and the lampshade covers the light-emitting hole. This application has a simple and compact structure, low glare, and reduces process steps and processing costs.

The present invention relates to a stretchable built-in welded wave-breaking plate, characterized in that the wave-breaking plate comprises an upper body of the wave-breaking plate, a lower body of the wave-breaking plate, and two welded supports arranged between the main body of the wave-breaking plate and the inner surface of the oil tank; the technical solution allows the unstretched wave-breaking plate to enter the traditional formed oil tank from the oil pump port, and is assembled with the pre-welded wave-breaking plate supports, and then the wave-breaking plate is stretched through the limiting groove, thereby increasing the coverage area of ​​the wave-breaking plate and improving the noise reduction effect; at the same time, the present invention uses welded supports instead of rivets, thereby avoiding opening holes in the oil tank again and reducing the hydrocarbon emissions of the oil tank.

This invention relates to the field of soybean protein product processing, and discloses a method for preparing steamed soybean protein tofu and its low-temperature segmented braising and roasting process. The method includes premixing soybean protein isolate with an ice-water mixture, sequentially adding sodium pyrophosphate, salt, and D-anhydrous glucose and chopping, adding soybean oil and sodium stearoyl lactylate and chopping, adding cold-soluble κ-carrageenan and glucono-delta-lactone, mixing and discharging, pre-gelling by heat induction, and then demolding and cutting to obtain the embryo. The embryo is then mixed with a compound flavored braising sauce and braised in two stages, followed by a first-stage dehydration and a second-stage roasting. It is then vacuum-packed and sterilized under pressure and cooled under pressure before being removed from the oven. This invention utilizes soybean protein isolate combined with an ice-water mixture and cold-soluble κ-carrageenan to form a microemulsion system. During heat induction and cooling, an interpenetrating double-network gel structure is constructed, controlling the temperature rise to prevent premature thermal denaturation and inducing uniform cross-linking to avoid pores, thereby improving the system's water and oil holding capacity and elasticity.

The present invention relates to a shock absorbing device for a navigation module of an automatic walking device, a navigation module and an automatic walking device, wherein the navigation module comprises a module housing and a navigation mainboard, wherein the upper part of the shock absorbing device is mounted on the navigation mainboard, and the lower part of the shock absorbing device is mounted on the inner wall surface of the module housing. The present invention adopts a shock absorbing device to perform physical filtering, so that the vibration caused by the high-speed rotation of the motor cannot be directly transmitted into the IMU. The navigation accuracy is optimized, and the workload of filtering high-frequency vibration interference in software and hardware is reduced. The shock absorbing device structure adopted by the present invention has a bayonet with a guide column at one end, and the other end is designed as a mounting port, and the interior is a spherical cavity. In this way, in application, it is only necessary to open a hole in the inner part, and make a corresponding ball head housing mounting column on the outer part. The structure of the shock absorbing device avoids opening a hole in the housing, which is convenient for waterproof and dustproof treatment of the overall module.

A safe energy-saving bus duct, comprising a shell, a ground row, a phase row, a bus protection piece, a bus connecting piece, a shell connecting structure; the shell comprises a top plate, a side plate, a bus sheath, a bottom buckle plate; the bus protection piece comprises a protection piece bottom plate, a wing plate, a bus side limiting block, a bus top limiting block, a clamping strip, a flap, a protection piece sleeve; the bus protection piece is inserted into the side plate groove, and the bus clamping strip on one side is clamped into the limiting block at the bottom side of the side plate; the bus connecting piece comprises a connecting bus, a connecting piece bottom plate, a connecting piece limiting block, a positioning rod, a connecting piece sleeve, and the bus connecting piece is arranged between two bus protection pieces; the shell connecting structure comprises an upper cover plate, an upper embedded plate, a lower cover plate, a lower embedded plate, a side guard plate, a side guard plate fastening bolt, and two shell bodies are fixedly connected through the shell connecting structure. The whole structure has high strength, the installation method is simple and rapid, the whole structure has high safety performance, the manufacturing process of parts is simple, and the production cost of the whole structure is low.

This application discloses a coating solution and its preparation method and application, relating to the field of coated photovoltaic glass technology. The coating solution includes water and hollow silica nanoparticles and solid silica nanoparticles dispersed in the water. The coating solution provided in this application uses hollow silica nanoparticles instead of traditional core-shell structure particles. During the tempering process, hollow silica nanoparticles do not exhibit large-scale thermal decomposition of polymeric substances and do not generate gas pressure in the film layer, thus avoiding the formation of pores in the film layer and improving the stability of the final coating.

The application provides a method for adding or subtracting yarns in a three-dimensional woven structure preform, which comprises the following steps: calculating the total number of added or subtracted yarns according to the row and column numbers of the initial and final cross sections; designing the total number of added or subtracted weft yarns according to the weaving length and weft density of the preform added or subtracted yarn range; if the theoretical total number of added or subtracted weft yarns is greater than the multiple of the number of warp yarn layers, the actual total number of added or subtracted weft yarns is adjusted to the multiple of the number of warp yarn layers; calculating the number of added or subtracted yarns per weft according to the total number of added or subtracted yarns and the total number of added or subtracted weft yarns; calculating the number of added or subtracted yarn positions per cross section according to the number of added or subtracted yarns per weft and the addition or subtraction of 2 yarns at each position; evenly distributing c positions on the same cross section; starting normal weaving, and performing the addition or subtraction of yarns every time the weft is introduced within the added or subtracted yarn range; if the weaving starts from the small end, the addition of yarns is performed; if the weaving starts from the large end, the subtraction of yarns is performed.

The invention relates to the technical field of coating materials, in particular to a gradient alloy coating and a preparation method of the gradient alloy coating. The preparation method of the gradient alloy coating comprises the steps that a cold spraying technology is adopted for conducting first spraying on base coat powder on a sliding bearing to obtain a base coat; copper-based alloy powder is subjected to second spraying on the base layer through the cold spraying technology, and the copper-based alloy surface layer is obtained; wherein the thickness of the bottom layer is 12%-20% of the thickness of the copper-based alloy surface layer. The problems that in the prior art, holes exist in a surface coating interface of a sliding bearing, the bonding strength is poor, the coating is prone to stripping under the heavy load condition, and consequently the sliding bearing is stuck in the running process can be solved.

The invention relates to a novel oral tooth orthodontic structure, and belongs to the technical field of tooth orthodontics, the novel oral tooth orthodontic structure comprises at least three U-shaped blocks, the inner sides of the U-shaped blocks are provided with adjusting assemblies, the outer sides of the U-shaped blocks are provided with separating assemblies, the outer sides of the U-shaped blocks are provided with shielding assemblies for shielding the adjusting assemblies, and the U-shaped blocks are connected with the separating assemblies. The adjusting assembly comprises two annular guiding pieces fixed to the left side wall in the U-shaped block, orthodontic steel wires arranged between the inner sides of the multiple corresponding annular guiding pieces in a penetrating mode, an adjusting box fixed to the inner bottom wall of the U-shaped block, two guiding rods fixed to the top of the adjusting box and a screw rotationally connected to the inner bottom wall of the adjusting box through a bearing. The adjusting block is in threaded connection with the outer side of the screw rod, and the T-shaped hole is formed in the front face of the adjusting block. According to the novel oral tooth orthodontic structure, the joint of the end part of the steel wire and a guide structure can be shielded and hidden, so that the wearing comfort and the use convenience are greatly improved.