122results about How to "Smooth appearance" patented technology

The invention provides an electrolyte for improving the interface stability of a four-electron aqueous zinc-iodine battery, and belongs to the technical field of zinc-iodine battery electrolyte additives, the electrolyte comprises N, N-dihydroxyethyl glycine, zinc sulfate, an additive and water; in the electrolyte, the concentration of the N, N-dihydroxyethyl glycine is 0.5 + / -0.2 mol / L; the molar ratio of the additive to the zinc sulfate is 1: 3; the additive comprises any one of methyl triethyl ammonium chloride, betaine hydrochloride and triethylamine hydrobromide. The electrolyte can enhance the interface stability of the electrode electrolyte, improve the cycling stability and electrochemical performance of the aqueous zinc-iodine battery, inhibit side reactions, and improve the safety and reliability of the battery. The invention also provides a high-capacity aqueous zinc-iodine battery.

The invention belongs to the field of secondary batteries, and particularly relates to an aqueous zinc ion battery electrolyte additive and an electrolyte. The additive is a beta-diketone organic reagent. When the additive is added into the zinc salt-containing electrolyte, dendritic crystal growth and hydrogen evolution corrosion of zinc can be remarkably inhibited, so that the cycle performance and coulombic efficiency of the zinc ion battery are improved. According to the invention, the zinc ion battery has good cycle performance, is easy for industrial production, and has an application prospect in the technical field of energy storage.

The invention provides an epoxy resin composition, a prepreg, a laminated board and a metal foil-clad laminated board. The epoxy resin composition comprises the following components in parts by weight: A, 100 parts of epoxy resin; b, 120-390 parts of a curing agent; c, 50 to 200 parts of inorganic filler; the curing agent comprises B1 amino modified organosilicon polymer and B2 amine curing agent and / or phenolic curing agent, and the ratio of B1 to B2 is (1: 2)-(1: 7). The amino modified organic silicon and the amine and / or phenolic aldehyde curing agent are compounded to co-cure the epoxy resin, the overall crosslinking density is increased, and meanwhile, compounding of epoxy resin with different molecular weights is combined, so that the effect of increasing the heat resistance and toughness of a system is achieved. Meanwhile, an amino modified organosilicon polymer is introduced into an epoxy resin system, so that the soft degree of a curing molecular chain can be adjusted, the release of stress in the resin curing process is accelerated, and the effect of flatness of the surface of the prepreg and the plate is achieved.

The utility model provides a piston pin convenient to install, and belongs to the technical field of piston pins. The groove is formed in the circumferential surface of the piston pin; the limiting rod is fixedly connected to the circumferential surface of the piston pin; the elastic sleeve is arranged on the circumferential surface of the piston pin in a sleeving mode, and the elastic sleeve is located in the groove; the circular holes are formed in the circumferential surface of the elastic sleeve, the stability of the piston pin in the moving process can be guaranteed through the existence of the elastic sleeve, possible deviation or shaking is reduced, meanwhile, the hollow grooves with the depth being 1 cm are formed in the circumferential surface of the piston pin, and due to the design, the weight of the piston pin is reduced, abrasion is reduced, and the service life is prolonged. And the elastic sleeve is flush with the piston pin, so that the appearance of the piston pin is smoother, the friction between the piston pin and other parts is reduced, and the maintenance cost is further reduced.

The wine cabinet or the refrigeration cabinet with the hidden door hinges comprises a cabinet body, a door body, the door hinges and cushion blocks, hinge cavities with side openings and rear openings are formed in the upper corner and the lower corner of one side of the door body, and each hinge cavity comprises a rotating hole with a lower opening and a fixing cavity; the door hinge comprises a fixed seat plate, a shaft seat plate and a hinge rotating shaft arranged on the shaft seat plate; the cushion block is in a right-angle shape and comprises a cushion part and a fixing part. The fixed seat plate is fixed with the front panel of the cabinet body, the shaft seat plate is rotationally matched with the hinge cavity, and the hinge shaft is rotationally matched with the rotating hole; the fixing part and the fixing cavity are embedded and fixed, and the cushion part is attached to the hinged cavity bottom plate and is in clearance fit with the shaft seat plate. The shaft seat plate is hidden in the hinge cavity, and the fixed seat plate is arranged in a gap between the door body and the cabinet body. Due to the adoption of the structure, the door hinge and the rotating hole are hidden and not exposed, and the top surface of the door body is flush with the top surface of the cabinet body, so that the overall appearance of the wine cabinet or the refrigeration cabinet is flat and attractive; and meanwhile, the door body is supported by the hinge rotating shafts on the two door hinges together, so that the door body is stressed in a balanced manner.

The invention discloses a preparation method and application of a biomimetic mineralized hydrogel coating with high adhesiveness, and relates to the technical field of bone implant surface modification. The method comprises the following steps: immersing a bone implant subjected to surface pretreatment into a polyvinyl alcohol solution, then carrying out single freezing and thawing cycle, and then carrying out annealing treatment, alternately soaking the annealed bone implant in a calcium-containing solution and a phosphorus-containing solution, and carrying out surface mineralization treatment; then, inducing a product subjected to surface mineralization treatment to obtain hydroxyapatite; the biomimetic mineralized hydrogel coating with strong adhesiveness is obtained on the surface of the bone implant. According to the method, the surface of the bone implant is coated with the strong-adhesion hydrogel coating by adopting a dip-coating method, and the thickness and the surface flatness of the coating can be controlled by adjusting the dip-coating frequency.

The utility model relates to the technical field of multifunctional household equipment, in particular to multifunctional household equipment, and aims to solve the problems that furniture and household appliances are purchased independently, the space of the furniture and household appliances is used unreasonably, and potential safety hazards exist. In order to achieve the purpose, the multifunctional household equipment comprises a furniture device and a household appliance, the furniture device is of a frame structure and comprises a plurality of compartments, and the household appliance is at least embedded in one compartment; an opening and closing door is arranged on the compartment adjacent to the compartment where the household appliance is located, the outer surface of the side, facing a user, of the household appliance is a plane, and when the opening and closing door is closed, the outer surface is flush with the opening and closing door. According to the utility model, the household appliance and the furniture device can be perfectly fused before leaving a factory, the space is not wasted, and the whole outer surface is flush, so that a user cannot be hooked or scratched, and the potential safety hazard is solved.

The utility model relates to the technical field of buildings, and discloses a glass curtain wall structure system with an embedded grating and a building. The glass curtain wall structure system embedded with the grating comprises a glass curtain wall and a grating assembly, the glass curtain wall is provided with a window, and the grating assembly is embedded in the window; the grille assembly includes a grille frame, a grille, and an auxiliary frame construction. The grating frame is of a frame structure matched with the window. The multiple grids are arranged in the grid frame at intervals, the auxiliary frame structure is arranged on the inner side of the grid frame, and the grid frame is connected with the window through the auxiliary frame structure. A traditional thick and heavy frame is omitted, the auxiliary frame structure is located on the inner side of the grating frame and hidden in the window to form an embedded structure, the overall appearance of the glass curtain wall is smooth, and the grating assembly is not provided with the thick and heavy frame structure and is simple, attractive and elegant.

The utility model discloses a toilet bowl with a hidden water tank. The toilet bowl comprises a base, a toilet seat, a seat ring and a pressurizing water tank. The base, the toilet seat and the seat ring are arranged in a split mode. A containing cavity is formed in the top end of the base, the toilet seat and the pressurizing water tank are arranged in the containing cavity, the pressurizing water tank is used for supplying water into the toilet seat, a through hole communicated with the containing cavity is formed in the bottom end of the base, and the bottom end of the toilet seat penetrates through the through hole. The bottom of the toilet seat is connected with the base; the seat ring is installed at the top end of the base, and the top of the toilet seat is connected with the bottom of the seat ring. According to the pedestal pan composed of the base, the toilet seat, the seat ring and the pressurizing water tank, the pedestal pan can be conveniently assembled, the pressurizing water tank is arranged in the base so as to hide the water tank, the appearance of the pedestal pan is more concise and smooth, and therefore the attractiveness of the pedestal pan is improved.

The invention relates to the technical field of electrolytic copper foils, in particular to a high-tensile electrolytic copper foil and a production process thereof. The appearance improving agent can form a molecular layer on the cathode, so that copper ions are deposited without orientation preference, fine and uniform crystal grains are obtained, and the surface of the produced electrolytic copper foil is brighter and more glossy. Furthermore, the smoothing agent can promote copper ions in the electrolyte to be more uniformly deposited on the cathode, so that the probability of copper stacking is effectively reduced, finally, the surface of the produced electrolytic copper foil is smoother, the roughness of the surface of the electrolytic copper foil is effectively reduced, and the electrolytic copper foil has better glossiness and appearance; under the action of mutual cooperation and mutual cooperation of the appearance improving agent and the smoothing agent, the prepared electrolytic copper not only has excellent tensile property, but also is smoother, smoother and glossy in appearance, and the quality of the produced electrolytic copper foil is effectively guaranteed.

The invention discloses a pneumatic high-speed rotating cup type electrostatic spraying nozzle which comprises a base, a rotating shaft, a nozzle body, a shell, a former, a connector, a liquid distribution disc, a rotating cup, a first fastener, a second fastener, a third fastener and a bearing. By the adoption of the technical scheme, the sprayed liquid spray material has the advantages of being corrosive, large in single-time coating coverage area, free of a liquid storage closed-loop circulation area inside, convenient to replace the spray head, sufficient in coating atomization and high in utilization rate.

The invention relates to the technical field of bandlet rings, in particular to a bandlet ring with balanced stress at a sewing position and a manufacturing method of the bandlet ring. A split braid is arranged at the side end part of the combined braid; a first group of warps, a second group of warps, a first group of wefts and a second group of wefts are arranged in each of the combined braid and the split braid; the first group of warps, the second group of warps, the first group of wefts and the second group of wefts are jointly woven to form a combined braid, the split braid is divided into an upper braid and a lower braid, the upper braid is formed by weaving the first group of warps and the first group of wefts, and the lower braid is formed by weaving the second group of warps and the second group of wefts; the flat belt ring manufactured by the invention obviously has a smoother appearance, and through comparison tests, the mechanical property of the flat belt ring is obviously improved under the conditions of the same yarn material, specification and dosage and the same finished product gram weight; during batch production, the process is easier to realize alignment table conversion, and the production efficiency is higher.

The utility model discloses an anti-drop waterproof mushroom head antenna, which comprises a radio frequency connector, a radiation antenna oscillator, an injection molding shell and an injection molding sheath, the radiation antenna oscillator is arranged at the upper end part of the radio frequency connector, and the lower end part of the radiation antenna oscillator is convexly provided with a first welding pin; a first welding pin is arranged at the upper end of the radio frequency connector in a protruding mode, a second welding pin is arranged at the upper end of the radio frequency connector in a protruding mode, the first welding pin and the second welding pin are fixedly connected through welding, the appearance of the injection molding shell is of a cone structure, the radio frequency connector and the radiating antenna oscillator are embedded in the injection molding shell, and an opening groove is formed in the middle of the lower end wall of the injection molding shell in a concave mode. The lower end portion of the radio frequency connector is located in the open groove, the injection molding sheath wraps the peripheral wall of the injection molding shell, and the injection molding shell and the injection molding sheath are both integrally formed through injection molding. According to the technical scheme, the anti-falling performance and the waterproof performance of the mushroom head antenna can be greatly improved, and the mushroom head antenna is smooth in appearance, attractive, elegant and high in practicability.

A long tubular cavity casting side core-pulling mold, including side core-pulling one and side core-pulling two, which are movably connected, one end of the side core-pulling one is connected with the left core mold integrally, the upper end face of the other end is concave with a groove, the left end of the groove is closed, the right end extends to the right end face of the side core-pulling one to form an opening, the closed end of the groove is a semicircular structure, the opening of the groove is gradually tightened inward at both ends, the opening width is less than the diameter of the semicircular closed end, the side core-pulling two has a protrusion at one end, which is matched with the groove, when the groove and the protrusion are closed, the side core-pulling one and the side core-pulling two are connected to form a detachable conical platform, the diameter gradually decreases from the leftmost side of the side core-pulling one to the rightmost side of the side core-pulling two, the other end of the left core mold is fixed with the left mold connecting plate through a connecting column. Improve production efficiency and production yield.

The utility model discloses a kitchen range's water pan structure, including water pan body, the water pan body is provided with burner avoidance hole and is used for connecting the mounting counter bore of water pan body and burner, the mounting counter bore is arranged aside the mounting hole, the mounting counter bore is detachably connected with the shield cap that is used for shielding the mounting connecting piece, the shield cap is detachably connected with the mounting connecting piece, and the mounting connecting piece is detachably connected with the mounting counter bore. According to the water pan, the mounting counter bore is formed in the water pan body, and the shielding cap is arranged in the mounting counter bore, so that mounting connecting pieces such as screws and nuts are effectively shielded, and the overall attractiveness of a stove is improved. By means of the design, after the cooker is installed, the appearance of the cooker is neater and smoother, no exposed installation part exists, and the high requirement of consumers for the appearance of the cooker is met.

The invention relates to an anti-wrinkle flax blended woven fabric and a production method. High-quality flax blended yarn is spun by optimizing the mixing ratio of raw materials and the spinning process. The weave structure adopts a double-layer structure and is arranged at intervals in the Z twist direction and the S twist direction, so that the interlayer connection stability is enhanced, and the fabric is endowed with good elastic restoring force and crease resistance; during weaving, efficient production of the fabric is ensured by adding specially-made wax blocks and optimizing a looming process. The developed fabric has the advantages of moisture absorption, air permeability, light and full hand feeling, smooth and stiff appearance and good shape retention, overcomes the problem that pure linen fabric is easy to wrinkle, and expands the application scene.

This invention relates to the field of molding and joining equipment for plastic sheets, specifically to a far-infrared hot-melt overlapping plastic box forming device, comprising a frame, a lower pressure mold fixedly connected to the frame, and a pressing mechanism. The pressing mechanism is disposed above the lower pressure mold and can move in a direction perpendicular to the surface of the lower pressure mold to press the joint of the sheet. A first clamping mechanism and a second clamping mechanism are respectively disposed on both sides of the lower pressure mold, which are used to clamp the two sections of the sheet to be joined. This invention, by fixing the first clamping mechanism and rotatably disposing of the second clamping mechanism, uses a rotating shaft to drive the second clamping mechanism to rotate around the axis, so that the sheet held by the second clamping mechanism automatically changes its spatial posture during the rotation, and drives the unconstrained sheet to move synchronously, thereby automatically converting the sheet from the initial enclosed state to a flat enclosed state that is easy for hot-melt pressing.

The present invention relates to the technical field of insulators, and specifically provides a surface-mounted tantalum insulator shell and a preparation method thereof. The preparation method specifically comprises: obtaining a tantalum-nickel composite plate by explosively compounding a tantalum plate and a nickel plate, performing multiple rolling and vacuum annealing treatments; contacting the tantalum-nickel composite plate with the nickel layer and the tantalum layer with the punch, and performing stamping and punching a small hole at the bottom to obtain a shell; assembling the glass, the composite tantalum wire and the shell and then performing high-temperature sintering to obtain an insulator shell; inserting a nickel tube onto the composite tantalum wire below the bottom of the shell, and fixing the nickel tube and the composite tantalum wire by laser welding to obtain an insulator shell with a nickel tube; immersing the shell bottom of the insulator shell with a nickel tube into a lead-tin solder to obtain a surface-mounted tantalum insulator shell. The surface-mounted insulator shell can not only reduce the weight of the tantalum capacitor, save costs, improve production efficiency, and improve assembly reliability and long-term stability.

The invention relates to the field of flux-cored wires, in particular to an electric-arc welding flux-cored wire based on C4 steel and a preparation method of the electric-arc welding flux-cored wire, and aims to solve the problems that an existing electric-arc welding flux-cored wire for the C4 steel is often unstable in welding quality, so that the strength of a welded joint is insufficient, and the corrosion resistance is poor. According to the preparation method, the fluorine-doped graphene aerogel serves as an important component of the arc welding flux-cored wire, so that the pore defect rate and the crack generation probability in the welding process can be effectively reduced, and the tensile strength and toughness of a welding area can be remarkably improved; according to the electric-arc welding flux-cored wire, the welded C4 steel part has more excellent mechanical performance and corrosion resistance, the overall quality of a welding area is improved, the overall fatigue life of the structure is prolonged, the damage resistance of the structure is improved, the electric-arc welding flux-cored wire is suitable for various welding technologies, the requirements under different welding conditions can be met, the technology is simple, operation is easy, and popularization is easy. The method is suitable for large-scale production.

The utility model provides a shell screw assembling and positioning tool. The shell screw assembling and positioning tool comprises a bottom support. The threaded holes are formed in the bottom support; one end of the guide column is in threaded connection with the threaded hole; the top pressing plate is provided with guide holes matched with the guide columns; the at least one positioning hole is formed in the top pressing plate and is matched with the convex part of the shell; the plurality of screw through holes are formed in the top pressing plate and are matched with the screw mounting holes of the shell one by one; when the shell is arranged on the bottom support and the top pressing plate is installed above the bottom support through matching of the guide holes and the corresponding guide columns, the shell is positioned through matching of the convex parts of the shell and the corresponding positioning holes, and the shell is in threaded connection with the tail ends, penetrating through the guide holes, of the guide columns through adjusting nuts, so that the shell is pre-pressed between the top pressing plate and the bottom support. The shell screw assembling and positioning tool is simple in structure and convenient to use, the shell can be horizontally pre-pressed by the top pressing plate, a screw through hole and a shell mounting hole are accurately aligned, and the side, where a screw is hit, of the shell is prevented from tilting due to elastic deformation.

The invention belongs to the technical field of building construction, and provides a construction method for a stone curtain wall and an apron node, which comprises the following steps: determining the mounting position and size of the stone curtain wall; cleaning a foundation surface at the position of the apron node, arranging a lime soil cushion layer, erecting a template, pouring concrete, and carrying out surface press polish and maintenance; releasing an installation control line of the curtain wall, installing an adapter according to the position of the embedded part, debugging the elevation and position of the adapter, then installing a supporting structure, and carrying out hanging part installation and stone installation; stone seams are trimmed, the adhesive tape pasted on the stone seams is cleaned, a polyphenyl foam rod is filled, and silicone sealant is injected into the seams through a glue gun; the construction site is cleaned, so that no dirt is left at the stone curtain wall and the apron node; the waterproof performance of the stone curtain wall and the apron joint is effectively improved, rainwater leakage is prevented, the interior of a building is protected against damage, the firm foundation of stone is ensured through the tamping and leveling mode of the cushion layer, and the possibility of deformation and cracking is reduced.

The invention relates to the technical field of traditional Chinese medicine and health food processing, and discloses a preparation process and application of a black ginseng extract lozenge, and the preparation process comprises the following steps: crushing starch, powdered sugar and polyethylene glycol in parts by weight, and sieving for later use; performing ultrasonic extraction and vacuum concentration on the black ginseng to obtain a black ginseng concentrated solution; slowly adding a pre-prepared black ginseng concentrated solution into the sieved starch and powdered sugar, and stirring to prepare a soft material; granulating, drying and finishing the soft material to obtain dry granules; and adding sieved polyethylene glycol into the dry particles, uniformly mixing, tabletting, forming, and sterilizing by ultraviolet radiation to obtain the buccal tablets. According to the method, ultrasonic-assisted extraction is adopted, so that degradation of heat-sensitive rare saponin is avoided; the concentrated solution is directly granulated, so that the difficulty that the extract absorbs moisture and is sticky is overcome, and the forming rate is increased; the prepared lozenge can activate a PI3K-Akt signal channel and regulate release of 5-HT, and can be used for preparing products for relieving chronic fatigue syndrome and improving spatial cognitive impairment.

The utility model discloses shaping ironing equipment for school uniform production, and relates to the technical field of treatment of fabrics and the like. The shaping ironing equipment for school uniform production comprises a base, and a fixing seat is arranged at the upper end of the base; the ironing assembly comprises a fixing support, and the fixing support is fixedly connected to the surface of the fixing base. A second driving motor is fixedly connected to the surface of the fixing support, a threaded rod is fixedly connected to the output end of the second driving motor and rotationally connected with the fixing support, the surface of the threaded rod is sleeved with a sliding block in a threaded mode, a telescopic rod is fixedly connected to the lower end of the sliding block, and a fixing block is fixedly connected to the output end of the telescopic rod. The school uniform can be ironed conveniently through rotation and movement of the iron, the ironing range of the school uniform can be expanded conveniently, the iron is installed on the surface of the second connecting rod, the height between the atomization barrel and the school uniform ironing platform is fixed, it is guaranteed that the spraying height of mist cannot be changed, then it can be guaranteed that the mist is sprayed evenly, and the ironing effect on the school uniform is improved.

The utility model relates to syringe technical field, specifically disclose an integration pre -filling syringe, include: safety protection cap, rubber needle cap, the rubber needle cap is inserted in the inside of safety protection cap, the utility model discloses the push -rod, push seat, push -rod two wings board and base anti -slip grain that set up, make the appearance line of syringe smooth, modelling is simple and not lose the science and technology feeling, its main part is cylindrical, one end is spacious medicine storage cavity, for pre -filling appropriate amount of liquid medicine, the other end gradually narrows to fine needle interface, the needle part is covered by the detachable rubber needle cap when not using, the outside is covered with safety protection device, both prevent pollution and protect the user from accidental injury, and increase the wavy anti -slip grain in sleeve middle part, strengthen the holding friction, improve the use scene, make the syringe applicable to humid or wear gloves scene, reduce the risk of slipping.

The utility model discloses a mobile phone protective shell injection mold, and particularly relates to the technical field of injection molds, the mobile phone protective shell injection mold comprises a bottom mold plate, a first module is mounted on the bottom mold plate, a second module is vertically arranged at one end of the first module, and a third module is vertically arranged at one end of the second module; a fourth module is vertically arranged at one end of the third module, an upper module is arranged above the bottom mold plate, and an injection molding opening is formed in the middle of the top end of the upper module; the third module comprises a first electric push rod, a first template and the like; the first module and the third module have the same structure; the fourth module comprises a second electric push rod, a second template and the like; the second module and the fourth module have the same structure; and the upper module is provided with a slot matched with the insertion block on the module. The machining precision of the mobile phone protection shell is improved through sealing fit between the modules, automatic demolding is achieved through the electric push rod, the multiple function requirements of the mobile phone protection shell can be met, and the production efficiency and the product quality are effectively improved.

The utility model provides a kind of automobile seat small table board with telescopic function, including front and rear sliding connection's upper table board framework assembly and lower table board framework assembly, and the front end of lower table board framework assembly is coated with first cladding panel, and the rear end of upper table board framework assembly is coated with second cladding panel, and the top surface of first cladding panel and second cladding panel is flush, and the top surface of both can form the external cladding panel that the framework assembly whole is coated after butt joint, when automobile seat small table board is in elongation state, middle section plastic piece middle cladding panel, middle section plastic piece left cladding panel and middle section plastic piece right cladding panel are all contact connection between the top surface of first cladding panel and second cladding panel, and the top surface of three is flush with the top surface of external cladding panel, when automobile seat small table board is in contraction state, three can be hidden in external cladding panel.The utility model can guarantee appearance beautiful, use comfort degree and safety while realizing length effective adjustment.

The utility model relates to a vehicle lamp device with a hidden side steering lamp, which comprises a double-color piece rearview mirror housing assembly, a diverging inner mask, a shell, a transparent light guide, a circuit board and a light source unit, the double-color piece rearview mirror housing assembly is fixedly arranged on the top side of the shell, and an inner accommodating cavity is formed by the double-color piece rearview mirror housing assembly and the inner side of the shell; the inner diverging mask, the transparent light guide, the circuit board and the light source unit are all arranged in the inner containing cavity, the circuit board is fixedly arranged on the shell, the light source unit is arranged on the circuit board and transmits light rays towards the end of the transparent light guide, and the transparent light guide is arranged below the inner diverging mask. According to the vehicle lamp device adopting the hidden side steering lamp, the appearance of the whole rearview mirror is more concise and smooth, and the grade feeling of a vehicle is improved; the system is simple in structure, meets the modern aesthetic concept, enables the vehicle to look more concise and elegant, shows the intelligence and technicalization of the vehicle, is ingenious in design, is simple in structure, is reliable in performance, and is suitable for large-scale popularization and application.

The utility model discloses an efficient plate labeling machine with an automatic decontamination mechanism, which relates to the technical field of plate processing equipment and comprises a labeling machine body and a transmission belt arranged on the labeling machine body. A protection shell is arranged on the right side of the upper end of the transmission belt, a plate body is arranged in the protection shell, a reciprocating sweeping mechanism is arranged on the protection shell, and a driving gear is fixedly installed at the output end of the motor. The utility model discloses an efficient plate labeling machine with an automatic decontamination mechanism. The driving gear and the driven gear are meshed with each other so as to drive the driven gear to rotate, the driven gear further drives the rotating shaft to rotate, the rotating shaft drives the sweeping rod to rotate along with the rotating shaft, the driving gear further drives the straight tooth rack to rotate, the straight tooth rack moves in the guide groove, and the straight tooth rack and the driven gear are meshed with each other. And the driven gear can move in a reciprocating mode, so that the plate body is repeatedly cleaned, and it can be ensured that dust on the surface of the plate is thoroughly cleaned.

The utility model discloses a telescopic demonstration device for teaching, which belongs to the field of teaching auxiliary appliances and comprises a carrier, a first drawing board and a second drawing board, the first drawing board and the second drawing board are both longitudinally mounted on the carrier, the first drawing board is slidably connected in a guide groove on the carrier to move between a first position and a second position, and the second drawing board is slidably connected in a guide groove on the carrier. The second drawing board is fixedly mounted on the carrying frame; at the first position, the first drawing board is positioned on the front side of the second drawing board and at least partially shields the second drawing board; at the second position, the first drawing board is located over the second drawing board and abuts against the upper end of the second drawing board, and the first drawing board and the second drawing board are located on the same vertical plane; when the two panels are unfolded for use, the dislocation feeling cannot be generated, the overall appearance is smoother and more concise, the visual sense is better, and due to the fact that the whole panel is a plane, during writing, the hand feeling is more stable and not prone to being influenced by a staggered layer structure, and the writing experience is smoother.