31results about How to "Avoid uneven thickness" patented technology

The utility model discloses a spraying device for a wave-absorbing coating on the surface of an EPS (Expandable Polystyrene) foam board, and relates to the technical field of coating spraying. A cleaning assembly is arranged on the upper side of the conveying belt; a mounting frame is arranged on the upper side of the conveying belt; a spraying assembly is arranged at the top of the mounting frame; an angle adjusting assembly is arranged at the bottom of the mounting frame; the spraying end of the spraying assembly is fixedly installed in the supporting assembly. When the angle adjusting assembly is adjusted to be perpendicular to the inclined plane of the foam board and the inclined plane of the foam board is perpendicular, paint can be sprayed to the inclined plane in the perpendicular direction, the problem that the incident angle on the inclined plane is too large is solved, and the paint is prevented from being accumulated on the inclined plane; in the moving process of the foam board, the elastic supporting assembly is pushed to move upwards, the output end of the spraying assembly and the foam board are always kept at the same height, and the coating thickness is kept consistent on the surface of the whole foam board.

The utility model discloses a kind of ceramic body bottle body surface glazing devices, comprising: support frame;Bottom support seat, bottom support seat is set in the inside of support frame;Inner fixed pillar, inner fixed pillar is fixedly connected in the inside of bottom support seat, the beneficial effects of the utility model are: through linear module drive side sliding frame along top support frame horizontal movement, combine the vertical position of glazing box of No. The inside of support piece is driven by the symmetrical transmission structure of two-way screw and moving block, and the synchronous opening and closing of the drive side fixed support is realized. The elastic material silica gel of inner support pad is matched, and the stability of glazing is improved.

The utility model discloses a wall body plastering thickness control device, including storage box and fixing frame, the storage box is equipped with T shaped rod through the pneumatic cylinder, be equipped with lifting screw rod through the rotation groove on the fixing frame, the inside of fixing frame is equipped with transmission room, two lifting screw rod end portions all extend to transmission room and are connected through the synchronous mechanism, be equipped with with one of the lifting screw rod connection's inside motor in transmission room, two lifting screw rod common screw thread cover set and be equipped with the lifting frame, be equipped with a plurality of mounting plate on the storage box fixedly, the utility model discloses through the engagement of outer motor drive gear and internal gear, realizes the automatic rotation leveling of storage box relative to lifting frame, has solved the problem of big, low efficiency of manual leveling difficulty in prior art, can adapt to the uneven ground scene, ensures that plastering thickness is even.

This utility model relates to the field of interior decoration, and in particular to an easy-to-install prefabricated high sound insulation partition wall device, comprising a keel, which includes top and bottom keels, vertical keels, crossbeams, and adjusting blocks. Several sets of top and bottom keels are respectively fixed to the top and bottom of the vertical keels. Several sets of vertical keels are arranged longitudinally at equal intervals. A slot is longitudinally opened through the top of each vertical keel, and a groove is transversely opened through the outer wall of each vertical keel. The crossbeams are inserted into the grooves, and the adjusting blocks are slidably connected within the grooves of the vertical keels. The adjusting blocks cooperate with the crossbeams. This utility model, through the assembly and combination of the adjusting blocks and crossbeams, can pre-fix the filling material, thereby reserving sufficient space for the air layer of the partition wall and avoiding uneven thickness of the reserved air layer thickness due to human error in different filling layers.

The utility model discloses spinning production equipment for cationic dyeable polyester pre-oriented yarn, and relates to the technical field of spinning production. Comprising a spinning machine body, the spinning machine body is provided with a winding mechanism used for spinning production of cation dyeable polyester pre-oriented yarn, tows passing through an adjusting assembly enter a winding assembly, a movable block slides on a sliding rod, a protruding block is arranged in the movable block and slides along an annular groove in a reciprocating lead screw, and the movable block can slide along the annular groove in the reciprocating lead screw. The movable block slides along the sliding rod through the reciprocating lead screw, then the movable rod and the wobble wheel are driven to do reciprocating motion, a rubber ring on the edge of the wobble wheel makes contact with a tow, in the reciprocating motion process of the wobble wheel, the tow is evenly wound around the winding shaft, and the limiting rod can limit the position of the tow to a certain degree; the tows are prevented from falling off from the wobble wheel, the problem that the tows are stacked, overlapped or irregularly wound on the winding shaft is solved, and the winding quality and appearance are improved.

The invention relates to the technical field of conjugated microporous polymer materials, and discloses a covalent triazine unit-based conjugated microporous polymer membrane with negative charges and a preparation method thereof. The method comprises the following steps: firstly, preparing a negatively charged cyanophenyl monomer through nucleophilic substitution reaction of a cyanophenyl-containing compound and 1, 4-butane sultone, then taking the monomer and biphenyl nitrile as comonomers, and carrying out step-by-step polymerization, heating film formation, shock cooling shaping and dual-solvent soaking post-treatment under the catalysis of trifluoromethanesulfonic acid to obtain the cyanophenyl-containing polymer film. And finally obtaining the covalent triazine unit-based conjugated microporous polymer membrane with negative charges. The preparation process is high in controllability, and the obtained film has high stability of a covalent triazine structure and the porous characteristic and negative charge function of conjugated micropores, and has wide application prospects in the fields of gas separation and the like through verification.

The utility model discloses an automatic equipment of gluing and film covering and solidification, including unwinding and winding assembly, including the unwinding roll of being able to to the one end unwinding of release film, still including the winding roll of the other end winding of release film, coating and coating subassembly, including the parallel arrangement of adjacent load roller, coating roller, ration roller, and coating roller is located between load roller and ration roller, and the top of the junction of coating roller and ration roller forms coating accumulation space, and coating roller can adhere and carry coating, and when release film passes load roller, can receive the coating adhered on coating roller, solidification subassembly, to the release film of adhering coating carries out light solidification, stripping and transferring subassembly, including the conveyer belt of being able to convey board material, and the coating after solidification is transferred to the board surface from release film with the cooperation of release film and conveyer belt. Adopt this utility model with the help of release film to indirectly coat, realize coating even film covering.

The application relates to a bamboo rotary cutting device, a supporting slide frame, a clamping frame arranged at one end of the supporting slide frame, a rotary cutting slide rail arranged at the upper portion of the supporting slide frame, a sliding cutter frame arranged on the rotary cutting slide rail at one side of the bottom of the clamping frame, a hinged cutter frame arranged in the sliding cutter frame, a rotary cutter horizontally arranged in the hinged cutter frame, a supporting slide rail hingedly arranged at one end of the bottom of the supporting slide frame close to the clamping frame, and a lifting rod arranged at the other end of the bottom of the supporting slide frame. The following technical effects can be achieved: the eccentric shaft frame and the cutter distance screw rod can be used in cooperation to finely adjust the vertical distance between the pressure ruler and the rotary cutter; the pushing screw rod can be used to horizontally adjust the horizontal position of the pressure ruler; the lifting rod can be used to adjust the angle of the supporting slide rail; the hinged cutter frame sliding on the supporting slide rail can be inclined according to the height of the supporting slide rail; the rotary cutter can always keep the optimal cutting angle with the surface of the wood, and the uneven thickness can be avoided.

The utility model discloses intelligent induction type part surface spraying and curing equipment, and relates to the technical field of part spraying and curing, the intelligent induction type part surface spraying and curing equipment comprises a support frame, one side of the support frame is provided with a controller, the top surface of the support frame is provided with a curing bin, and the top surface of the curing bin is provided with an induction device. A motor is installed on the top face of the curing bin, a transmission rod is installed on the bottom face of the motor, a uniform curing assembly is arranged on the upper portion of the supporting frame and comprises an air heater, the air heater is arranged on one side of the supporting frame, a hose is installed on one side of the air heater, and a connecting pipe is installed at one end of the hose. According to the uniform curing assembly disclosed by the utility model, hot air is uniformly sprayed on the surface of a part through the cooperation of the hot air blower, the hose, the connecting pipe, the annular pipe and the spray pipe, so that the problem of non-uniform coating thickness caused by unilateral circulating hot air is avoided.

The utility model relates to the technical field of gluing and coating equipment, and discloses a copper-clad plate gluing and coating device which comprises a working table and a U-shaped frame installed on the upper surface of the working table, an unwinding roller and a winding roller are rotationally connected in the U-shaped frame, and the copper-clad plate gluing and coating device further comprises an adjusting structure arranged in the U-shaped frame, the gap adjusting device is used for adjusting the gap between the coating roller and the copper-clad plate. According to the gluing and coating device for the copper-clad plate, the hydraulic cylinder in the adjusting structure drives the U-shaped plate to move up and down, the gap between the coating roller and the copper-clad plate can be accurately adjusted, the coating requirements of copper-clad plates with different thicknesses and specifications are met, and the problem that a traditional device is insufficient in structural flexibility is solved; and a metering pump in the control structure can accurately control the output quantity of the glue solution according to preset parameters, and is matched with a liquid level sensor to monitor the liquid level in the glue solution box in real time, so that non-uniform coating thickness caused by unstable flow is avoided, and the coating quality of the copper-clad plate is remarkably improved.

The invention relates to the field of winding devices, in particular to an online coating cream tissue winding production line which structurally comprises a coating roller set comprising a supporting shell, supporting outer frames are arranged on the two sides of the supporting shell, a cooling roller and a coating roller are arranged between the supporting outer frames, and a feeding hopper is installed on the surface of the coating roller; a control roller is installed at a liquid outlet of the feeding hopper, the feeding hopper controls the thickness of the liquid level of the cream liquid coating roller through the control roller, the cooling roller comprises a roller body and a linkage box, the linkage box is connected with the roller body and the coating roller and driven by a driver, and the cooling roller and the coating roller rotate synchronously through the linkage box. The non-uniform thickness of the coating caused by differential speed is thoroughly avoided, the consistency of the coating on the surface of the tissue is guaranteed, the supporting shell forms a closed space, and pollution of dust to the uncured coating is effectively reduced; the quick cooling function of the semiconductor heating strip enables the cream liquid to be immediately shaped after being coated, the cream liquid is subsequently further cured through the drying bin, and the temperature control assembly is in sliding fit with the outer ring.

This utility model relates to the field of infrared coating electroplating technology, specifically designing an electroplating device for multi-part coating in a single tank. It includes a power supply, with an anode connected to an anode mechanism and a cathode connected to a cathode mechanism. The anode and cathode mechanisms are connected via an electroplating tank, and a bubbling mechanism is provided at the bottom of the electroplating tank. The anode mechanism of this device includes several spaced anode plates, which can achieve uniform voltage distribution, avoiding the problem of uneven coating thickness during electroplating. The connection between the anode plates and the anode mechanism is convenient and easy to maintain. The bubbling device incorporates a check valve to improve device stability and prevent plating solution backflow. The uniformly designed air pipes can evenly bubble, avoiding pitting problems on the surface of parts caused by side reactions such as hydrogen evolution. Multiple cathode hooks in the cathode mechanism allow the device to safely and reliably perform multi-part electroplating in a single tank.

This utility model relates to the field of ball pin technology and discloses a ball pin oiling mechanism, including a base plate, a ball pin bearing assembly, a guide assembly, and a coating mechanism. The ball pin bearing assembly is movably mounted on a guide rod located in the middle of the base plate. The guide assembly includes a guide rail plate and a slider, with the two guide rail plates respectively located on the front and rear sides of the support plates at the left and right ends of the base plate. When the ball pin bearing assembly carries the ball pin and moves downwards under pressure, it drives the slider to move towards each other along the guide groove on the guide rail plate via a linkage mechanism. In the coating mechanism, the oiling sponge and the smoothing sponge are respectively driven by the slider to the oiling surface attached to the ball pin. This utility model's ball pin oiling mechanism replaces manual multi-tool operation with a simple mechanical linkage structure, simplifying the oiling process and improving oiling efficiency. The cooperative design of the oiling sponge and the smoothing sponge ensures uniform application of lubricant, avoiding the uneven thickness problem caused by manual application.

The application relates to the field of inkjet printing technology, and particularly discloses a surface inkjet printing method, device and system for special-shaped products, which comprises the following steps: scanning a special-shaped product to be inkjet printed to determine the surface contour of the special-shaped product; determining the inkjet printing track of a nozzle and the surface to be inkjet printed according to the surface contour, the inkjet printing track and the surface of the special-shaped product always maintaining a preset distance; and controlling the nozzle to inkjet print the surface to be inkjet printed of the special-shaped product along the inkjet printing track. In this way, the inkjet printing track of the nozzle and the surface to be inkjet printed is determined according to the obtained surface contour, and the inkjet printing track and the surface of the special-shaped product always maintain a preset distance. The coating deposition amount difference caused by the distance change between the nozzle and the product surface is effectively solved, and the uniform distribution of the coating thickness in different areas is realized.

The utility model discloses a kind of electroplating hangers, it is related to electroplating equipment technical field.The electroplating hanger includes: suspension assembly, first fixed part and second fixed part;Above-mentioned suspension assembly includes electrically-conductive clamp and electrically-conductive hook;Above-mentioned electrically-conductive clamp is set to electrically-conductive hook inner side, and with electrically-conductive hook direct contact;Above-mentioned electrically-conductive clamp is used to hold cathode rod of electroplating equipment, lower end of above-mentioned electrically-conductive hook is electrically connected with above-mentioned second fixed part;Above-mentioned first fixed part and above-mentioned second fixed part between be provided with for accommodating the accommodating space of workpiece to be plated.It can improve the problem that cathode rod and electroplating hanger contact badly, heat loss is serious etc. during electroplating, avoid the problem that the thickness of electroplating layer is not uniform caused by uneven current, improve electroplating quality and the yield of electroplating workpiece.

The invention belongs to the technical field of dental prosthesis manufacturing, and particularly relates to a denture processing-based rapid glazing device which comprises a first rack and a second rack, two supporting plates are fixedly arranged at the upper end of the second rack, two conveying belts are arranged between the two supporting plates in a transmission manner, and a plurality of supporting plates can be sequentially placed on the two conveying belts at intervals; a distributor is arranged above the position between the two supporting plates in a sliding mode, a plurality of spraying pipes are arranged at the bottom of the distributor, an elastic net pipe is arranged outside each spraying pipe, each elastic net pipe is of a hollow structure, the bottom of each elastic net pipe is open, and a coating film is arranged in each elastic net pipe; when the false tooth is glazed, the material spraying pipe sprays the glaze on the surface of the false tooth after atomizing the glaze and sprays part of the glaze on the coating film, and when the coating film is glazed, the coating film moves up and down and uniformly coats the glaze on the surface of the false tooth. The problems that according to existing glazing equipment, the uniformity of a false tooth glaze layer is poor, the conveying stability of a supporting plate is poor, and glaze residues are difficult to remove are solved.

The utility model relates to the technical field of dispensing equipment, and discloses an LCM precise dispensing mechanism which comprises a fixing frame, an adjusting mechanism is fixedly connected to the middle of the inner wall of the fixing frame and used for precise dispensing, and a lifting mechanism is fixedly connected to the front side of the bottom of the fixing frame and used for lifting machining materials. The right side of the inner wall of the fixing frame is fixedly connected with a detection mechanism. And the adjusting mechanism comprises a moving strip, the moving strip is fixedly connected to the rear side of the inner wall of the fixing frame, and a first motor is slidably connected to the top of the outer wall of the moving strip. The adjusting mechanism drives the moving wheel and the mechanical arm to drive the dispensing head to move front and back through the first motor, the moving assembly achieves left-right positioning of the dispensing head through the second motor, the conveying belt and the electric push rod, and the suction cup assists in fixing materials. And fixed clamping dispensing prevents the influence on a curved surface structure, and multiple mechanisms cooperate to complete accurate dispensing.

The utility model discloses a kind of chip package, including first soldering pad, the first insulating layer of wrapping first soldering pad, second soldering pad being set on the surface of first insulating layer, chip being set on at least one second soldering pad, plastic package being set on the surface of first insulating layer and wrapping second soldering pad and chip, circuit layer being set on plastic package and with second soldering pad and / or chip conductive connection;First soldering pad thickening setting forms thickening soldering pad, protrudes the surface of first insulating layer.In the utility model, first insulating layer wraps first soldering pad, shorten the distance between first soldering pad and second soldering pad, shorten heat transfer distance, improve heat dissipation efficiency;Second soldering pad is set on the surface of first insulating layer, chip is attached on second soldering pad, without polishing to first insulating layer to expose soldering pad, avoid polishing to produce uneven thickness problem;First soldering pad thickening processing forms thickening soldering pad protruding first insulating layer, improve accurate positioning when external connection, avoid appearing problem of false welding.

The utility model relates to an efficient coating dynamic and static pressure chamber which comprises a base, a shell fixed to the upper end of the base, a flow equalizing mechanism installed in the shell, a fan installed on the side face of the shell and a controller fixed to the side face of the shell. By means of the specially related flow equalizing mechanism, fluid momentum in a high-speed area can be transmitted to a low-speed area through a hole or a flow guide structure, a more uniform velocity field is formed by mixing high-speed jet flow with surrounding low-speed fluid, airflow entering the shell is more uniform, meanwhile, part of airflow is led out from the flow equalizing mechanism, and the flow equalizing efficiency is improved. And low-pressure areas are formed on the two sides of the base, so that internal air is sucked, the air moves towards the two sides, the number of paint repeatedly falling onto a workpiece during paint spraying is reduced, and the paint spraying uniformity is improved.

This application relates to the field of semiconductor technology and provides a method for preparing and analyzing high-power bare chip failure analysis samples. The method includes: fixing the back surface of the high-power bare chip under test to the patch area of ​​a carrier substrate; wire bonding the functional electrode area on the amorphous back surface of the chip to the lead pads of the carrier substrate; preparing a polymer encapsulation layer on the amorphous back surface to obtain a molded high-power bare chip; peeling the molded high-power bare chip from the patch area of ​​the carrier substrate; grinding, fine polishing, and thinning the back surface to obtain the target failure analysis sample; powering the target failure analysis sample by connecting the lead pads outside the back surface area; observing the back surface area of ​​the target failure analysis sample to determine the failure location. This application not only avoids high-power bare chips being broken down or burned by high voltage and high current in failure analysis scenarios, but also significantly improves the sample preparation efficiency and quality of high-power bare chip failure samples.

The utility model relates to the technical field of steel structure anticorrosive coating spraying, especially a ship steel structure anticorrosive coating rapid processing device, including the placement platform and steel structure body, the placement platform top is fixedly connected with the jar body, the jar body top is fixedly connected with high pressure pump, high pressure pump output is fixedly connected with the feed pipe, the feed pipe is fixedly connected with the spray gun away from high pressure pump one end, the spray gun output is fixedly connected with the porous spray head, the spray gun outside is connected with the clamping plate of sliding, through the design cooperation of tensile spring and clamping plate, make the device can let the spray gun fixed in the clamping plate interior from top to bottom spray on the surface of steel structure body, effectively avoid using spray gun to spray anticorrosive coating to steel structure body, because the operator's technical problem leads to the condition that anticorrosive coating's thickness is not one, improve the evenness of spray gun to spray anticorrosive coating to steel structure body to some extent.

The invention relates to the technical field of ceramic glaze spraying, in particular to a glaze spraying device and process for ceramic artware, and the glaze spraying device comprises a bearing and fixing mechanism, a glaze storage mechanism mounted on the bearing and fixing mechanism, two porcelain clamping mechanisms movably mounted in the bearing and fixing mechanism, and a glaze spraying adjusting mechanism mounted in the glaze storage mechanism; the bearing fixing mechanism comprises a bearing base, and a plurality of first studs are fixedly installed on the bearing base. The glaze storage mechanism is installed on the bearing and fixing mechanism, porcelain with a complex structure can be fixedly clamped by means of the two porcelain clamping mechanisms, after the porcelain is located in the center of the two shells, glaze is input along the two closed shells, and finally, a spray pipe can be kept in the direction perpendicular to a porcelain blank for direct spraying all the time; and after the inner ring pad rotating at a constant speed is rotated, the directly sprayed glaze mist can be continuously and uniformly sprayed on the surface of the porcelain, so that the problem of non-uniform glaze layer thickness caused by insufficient glaze mist spraying continuity is avoided.

The application belongs to the technical field of forging forming die, and specifically relates to an engine rocker arm forging forming die, which comprises a base, a lower die fixedly installed on the top of the base, a slide rod fixedly installed on each corner of the top of the base, a top plate fixedly installed on the top of the slide rod, a hydraulic push rod fixedly installed in the top plate, an upper die fixedly installed on the output end of the hydraulic push rod, and a positioning frame fixedly installed on the top of the upper die. The upper die is firstly lowered under no load, a connecting plate is synchronously pressed down, an oiling tank is driven to slide horizontally to the right along a limiting guide frame through a connecting shaft, the surface of a lower die cavity is automatically coated with lubricating oil by means of a bottom elastic oiling head, the upper die is reset after oiling, and the blank is placed and then lowered again to complete the lubricating coating on the surface of the blank synchronously, so that the lubricating timing is accurately matched with the forging rhythm, and the defects such as die sticking and surface tearing can be effectively reduced.

This invention discloses a test device and method for highway subgrade filler. The invention relates to the field of highway subgrade filler testing technology, and includes a workbench. A translation component is located at the top of one end of the workbench, and a rotation component is located at the top of the translation component. A semi-gear rack and pinion circulating drop component and a cleaning component are located at the top of the workbench. A compaction component is located at the bottom of the semi-gear rack and pinion circulating drop component. A compaction sleeve assembly is located at the top of the rotation component. The top sidewall of the compaction sleeve assembly is connected to the rotation component via a positioning component. Multiple limiting bosses are arranged in a circumferential array at the top of the compaction sleeve assembly. By incorporating the cleaning component, this invention prevents the nut from loosening due to vibration generated during the compaction component's hammering of the filler, ultimately preventing the small compaction sleeve from slipping off the threaded rod of the positioning component.

The utility model discloses a kind of box coating mechanisms, belong to foaming box coating technical field, to solve when local plating solution concentration difference, easy to cause plating layer thickness is inconsistent, coating quality needs to be promoted problem. Including box, vertical plate is installed in the middle position of box upper surface one end, vertical plate is provided with sliding slot, sliding slot is slidably connected with connecting plate, connecting plate side is connected with rotating assembly, rotating assembly is in the middle position of box. The box coating mechanism, through the setting of rotation component, let the each surface of foaming mould be contacted with electrolyte evenly when electroplating, avoid the coating layer thickness uneven caused by local electrolyte difference, improve the quality of coating, through the setting of first motor, vertical plate, sliding slot, screw rod, connecting plate, it is convenient to drive rotating assembly to move up and down, to facilitate foaming mould to expose electrolyte, when fixed foaming mould, need not contact electrolyte, improve safety.

The utility model discloses an axle fixing disc surface rust-proof treatment device, which relates to the technical field of axle fixing disc rust-proof treatment and comprises a rotating disc, a first gear is arranged at the top end of the rotating disc, a driving component is arranged at the bottom end of the rotating disc, and two symmetrically distributed second gears are rotatably mounted at the top end of the rotating disc. The two second gears are meshed with the first gear, two symmetrically-distributed supporting frames are fixedly installed at the top end of the rotating disc, rotating shafts are fixedly installed in the middles of the top ends of the two second gears, first bevel gears are fixedly installed at the top ends of the two rotating shafts, and reciprocating lead screws are rotationally installed in the middles of the two supporting frames. According to the device, under driving of the motor, a spray head can do circular motion to spray an axle fixing disc, and meanwhile, a reciprocating lead screw is driven to rotate, so that the spray head is driven to do reciprocating motion, the efficiency and quality of rust prevention treatment are improved, and the problem that the thickness of paint is not uniform due to manual spraying is solved.

The utility model relates to the field of building construction, in particular to a concrete module integrating the functions of thickness control, steel bar support and cushion block, which comprises a module body, the module body is provided with a support part, and a reinforced concrete protection area is formed between the support part and the end part of the module body. According to the utility model, the module body is provided with the supporting part for placing the steel bar, and the reinforced concrete protection area is formed between the supporting part and the end part of the module body, so that the distance from the outer surface of the steel bar to the edge of concrete can be accurately controlled; the problem that in the actual construction process, the steel bar protective layer cushion block at the bottom of the steel bar split head is prone to slipping and even falling off, so that after concrete pouring is completed, the steel bars are exposed or the thickness of the protective layer is insufficient, and the service life of the steel bars is prolonged is effectively solved. The problem that in the actual construction process, the steel bar protective layer cushion block at the bottom of the steel bar split head is prone to slipping and even falling off is effectively solved. And the problems of steel bar corrosion and concrete cracking are solved.

The application discloses a glassy carbon gradient-coated hard carbon negative electrode material and a preparation method and application thereof. The preparation method comprises the following steps: S1, uniformly mixing hard carbon powder and / or hard carbon precursor powder with furan resin powder to obtain a composite precursor powder; and S2, sequentially performing low-temperature melting quenching treatment and sectional type temperature rising carbonization treatment on the composite precursor powder to obtain the hard carbon negative electrode material. The preparation method is simple in operation, can integrally form a glassy gradient carbon layer with gradient distribution of density, pore size and content of heteroatoms on the surface of the hard carbon, the dense inner layer can precisely block the defects on the surface of the hard carbon, inhibit the electrolyte side reaction, the porous outer layer can construct a rapid transmission channel for ions and electrons, and the gradient distribution of the content of the heteroatoms is beneficial to the regulation of the interface electron structure and the induction of the formation of a stable SEI film. The sodium ion battery constructed by the hard carbon negative electrode material exhibits high charging specific capacity, high first-cycle coulombic efficiency and excellent cycle stability.

This invention provides a coaxial core-setting system and a continuous casting cladding production line, belonging to the field of hot-melt continuous casting technology. The coaxial core-setting system includes a crystallizer and a two-dimensional fine-tuning device. The crystallizer is connected to the inlet and outlet of the furnace on the same axis, and contains a core-setting mold to constrain the radial displacement of the steel core. The two-dimensional fine-tuning device is located before the furnace inlet and / or after the furnace outlet, and includes a support member for supporting the steel core. The two-dimensional fine-tuning device can drive the support member to move horizontally and vertically in a plane perpendicular to the steel core's trajectory. The coaxial core-setting system of this invention ensures that the axis of the steel core is coaxial at the furnace inlet and outlet, thereby helping to maintain the uniformity of the steel core cladding thickness.