49results about How to "Improve internal structural strength" patented technology

A structured composite is comprised of particulates having particle size distribution of at least two modes and a binder. The particle size distribution is preferably bi-modal or tri-modal. The composite may further contain a density-modifying agent for modifying the density of the composite. The particulates are preferably substantially spherical and may be ultra lightweight (ULW) materials. The resulting composites exhibit the requisite strength to survive downhole imposed stresses and temperatures.

A lighted bollard system that has significantly enhanced internal structural strength while providing for the replacement of the outer bollard cover and allows users to select from a plurality of different lighting fixtures suited for different applications.

The inventions belongs to the technical fields of manufacture of conical cement electric poles, cements communication poles and cement lamp poles and particularly relates to a centrifugal forming die and a construction method for a high-strength conical cement pole. The centrifugal forming die comprises a conical outer die, a conical inner die, an inner die large-end flange plate, a large-end prestress tensioning ring, an outer-die large-end flange plate, an outer-die small-end flange plate, a die cavity small-end closing plate, one group of running wheels, one group of bolt assemblies, a prestress locking nut, a mortar injecting port and an exhaust port, wherein the conical outer die, the conical inner die, the large-end prestress tensioning ring and the die cavity small-end closing plate form a closed annular die cavity; one group of large-end longitudinal rib inserting holes are formed in the large-end prestress tensioning ring; and one group of small-end longitudinal rib inserting holes are formed in the die cavity small-end closing plate. According to the centrifugal forming die and the construction method disclosed by the invention, the conical cement poles with the advantages of smooth inner and outer surfaces, high internal structural strength and uniformity in wall thickness can be produced. In addition, the wall thickness of the cement poles can be accurately controlled, so that the materials can be saved, the service strength of the pole bodies is ensured and the work environment of the field is improved.

The invention discloses a coating fluid for preparing inkjet high-gloss waterproof printing paper, which comprises the following components in parts by weight: 10-40 parts of ink powder adsorbent, 30-55 parts of adhesive, 0.05-0.15 part of whitener, 0.05-0.15 part of dispersing agent, 2-5 parts of defoaming agent, 1-3 parts of neutralizer and 140-200 parts of distilled water. The adhesive is a cationic water-based polyurethane emulsion. The invention also discloses a printing paper for preparing the coating fluid and a preparation method thereof. The coating fluid has the advantages of no toxicity, no odor, favorable bonding property and favorable water resistance; the coating has favorable weather resistance and can bear sunlight irradiation for a long time; the coating has the advantages of high internal-structure strength and favorable adhesion for the substrate; and the coating printing surface has favorable scratch resistance. The printing paper prepared from the coating fluid has the advantages of ultrahigh drying rate after ink absorption, bright color, high color reduction degree, no piling phenomenon and favorable waterproof effect; and the output image has clear and sharp picture.

In a insert-type continuous casting nozzle comprising a highly functional layer formed to have a high corrosion resistance, a high anti-attachment capability, etc., and provided to define an inner bore thereof, the present invention is directed to providing a refractory material (mortar) for an intermediate layer of the continuous casting nozzle, which has a property capable of fixing an inner bore-side layer to an outer periphery-side layer (a nozzle body) of the continuous casting nozzle, while preventing the occurrence of expansion splitting in the outer periphery-side layer due to a difference in thermal expansion between the inner bore-side and outer periphery-side layers, and a continuous casting nozzle using the refractory material for the intermediate layer. The refractory material for the intermediate layer contains a hollow refractory aggregate in an amount of 10 to 75 volume %, wherein a ratio of an average radius R of each particle of the aggregate to an average wall thickness t of the particle satisfies the following relation: R / t≧10. This refractory material is disposed between an inner bore-side layer (2) and an outer periphery-side layer (3, 4) of a continuous casting nozzle.

The invention discloses a combined type wooden door. The combined type wooden door comprises a door frame part which is hinged to a door leaf part through a hinge; the door frame part comprises a pairof first connection parts arranged in an up-down symmetry manner; the first connection parts are each connected with a second connection part in a joggled joint manner; a tenon is arranged on each first connection part; and a groove matched with the corresponding tenon is formed in each second connection part. The door leaf part comprises a three-layer solid wood structure, wherein thin wood board layers are on the two sides, and a spliced layer is sandwiched and arranged between the thin wood board layers; the spliced layer comprises a pair of symmetrically arranged first C-shaped wood boards; a bottom cross beam is connected between the first C-shaped wood boards in a joggled joint manner; second C-shaped wood boards are connected to the upper portions of the first C-shaped wood boardsthrough double-end bolts and nuts; a middle cross beam is connected between the second C-shaped wood boards in a joggled joint manner; third C-shaped wood boards are connected to the upper portions ofthe second C-shaped wood boards through double-end bolts and nuts; and a top cross beam is connected between the third C-shaped wood boards in a joggled joint manner. The combined type wooden door has the beneficial effects that a door frame is easy to disassemble and assemble, convenient to transport and high in inner structural strength.

The invention discloses a high-temperature-resistant and corrosion-resistant solar silica gel plate and a preparation method thereof, and particularly relates to the technical field of solar silica gel plates, and the high-temperature-resistant and corrosion-resistant solar silica gel plate comprises dimethyl silica gel, white carbon black, hydroxyl silicone oil, a temperature-resistant agent, polyimide fibers and an organic solvent. The acid and alkali resistance of the high-temperature-resistant and corrosion-resistant solar silica gel plate can be effectively improved, the high-temperature-resistant and corrosion-resistant solar silica gel plate can be used under acid and alkali conditions for a long time, the hardening and embrittlement problems cannot occur, and the service life is guaranteed; the temperature-resistant agent in the formula can realize composite modification treatment on the silica gel material and the polyimide fiber respectively, is used for enhancing the temperature resistance and the safety performance of the solar silica gel plate, and can improve the acid and alkali resistance and the service life of the solar silica gel plate; the polyimide fiber in the formula serves as a framework of the solar silica gel plate, the internal structural strength of the solar silica gel plate can be effectively improved, and the acid and alkali resistance, the structural strength and the safety performance of the solar silica gel plate can be effectively improved.

The invention discloses environment-friendly concrete. The environment-friendly concrete comprises cement, sand, cobblestones, polyethylene filaments, polyethylene granular balls and the like. The environment-friendly concrete has the advantages that the polyethylene granular balls are used to partially replace aggregates in traditional concrete raw materials, polyethylene plastics are recycled, and pressure caused by plastic garbage on environments can be lowered; the environment-friendly concrete is good in structural strength, lightweight, good in ductility, good in weather resistance and good in crack resistance and impact strength.

In a insert-type continuous casting nozzle comprising a highly functional layer formed to have a high corrosion resistance, a high anti-attachment capability, etc., and provided to define an inner bore thereof, the present invention is directed to providing a refractory material (mortar) for an intermediate layer of the continuous casting nozzle, which has a property capable of fixing an inner bore-side layer to an outer periphery-side layer (a nozzle body) of the continuous casting nozzle, while preventing the occurrence of expansion splitting in the outer periphery-side layer due to a difference in thermal expansion between the inner bore-side and outer periphery-side layers, and a continuous casting nozzle using the refractory material for the intermediate layer. The refractory material for the intermediate layer contains a hollow refractory aggregate in an amount of 10 to 75 volume %, wherein a ratio of an average radius R of each particle of the aggregate to an average wall thickness t of the particle satisfies the following relation: R / t≧10. This refractory material is disposed between an inner bore-side layer (2) and an outer periphery-side layer (3, 4) of a continuous casting nozzle.

A lighted bollard system that has significantly enhanced internal structural strength while providing for the replacement of the outer bollard cover and that allows users to select from a plurality of different lighting fixtures suited for different applications.

The invention discloses a coating fluid for preparing inkjet high-gloss waterproof printing paper, which comprises the following components in parts by weight: 10-40 parts of ink powder adsorbent, 30-55 parts of adhesive, 0.05-0.15 part of whitener, 0.05-0.15 part of dispersing agent, 2-5 parts of defoaming agent, 1-3 parts of neutralizer and 140-200 parts of distilled water. The adhesive is a cationic water-based polyurethane emulsion. The invention also discloses a printing paper for preparing the coating fluid and a preparation method thereof. The coating fluid has the advantages of no toxicity, no odor, favorable bonding property and favorable water resistance; the coating has favorable weather resistance and can bear sunlight irradiation for a long time; the coating has the advantages of high internal-structure strength and favorable adhesion for the substrate; and the coating printing surface has favorable scratch resistance. The printing paper prepared from the coating fluid has the advantages of ultrahigh drying rate after ink absorption, bright color, high color reduction degree, no piling phenomenon and favorable waterproof effect; and the output image has clear and sharp picture.

The invention discloses a preparation method of a sandwich plate, and belongs to the technical field of decorative material preparation. According to the preparation method, firstly, camphorwood is used as a raw material, and the camphorwood has the effects of insect prevention, mildew prevention and sterilization, so that the insulation property of an internal plate is greatly increased; then peanut oil is used a raw material, and micro-blasting wood pulp and the peanut oil are mixed and fermented, so that the internal plate of the preparation method has the effects of moisture protection, sterilization and bacteriostasis; zinc powder is soaked in a lanthanum nitrate solution, so that a lanthanum oxide protective film is formed on the surface of the zinc powder, the relative contact angleof the zinc powder is increased by the lanthanum oxide protective film, and the fire resistance of the zinc powder is good, so that an external plate has excellent flame resistance due to the use ofthe zinc powder; then sardines bones are used as raw materials, the sardines bones contain a large amount of fluorine, the fluorine has hydrophobicity, so that the moisture resistance of the modifiedzinc powder is increased, the modified zinc powder is used as the raw material to prepare the external plate, and two modified external plates are respectively bonded to the front and back surfaces ofthe modified internal plate by epoxy glue so as to prepare the sandwich plate. The preparation method has wide application prospects.

The invention discloses a space-saving distribution box with an insect-proof network structure, which relates to the field of distribution box equipment, and solves the problems of complex structure,large occupying space and bad insect-proof effect of the existing distribution box. A space-saving distribution box with insect-proof net include that box, the bottom of the box is welded with four supporting legs, a sliding box door is connected with the front end of the box body, the sliding box door is slidably connected with a sliding groove inside the box body, the top of the box body is welded with a rain-proof shed, an invisible insect-proof net is arranged on the inner top surface of the box body, The inner side of the box body opposite to the sliding box door is provided with a noise-absorbing partition plate, a noise-absorbing cotton is arranged in the sandwich of the noise-absorbing partition plate, a hinge slide rail is arranged inside the box body, the hinge slide rail is matched and connected with a sliding hinge, the sliding hinge is rotatably connected with a placing plate, and an air-conditioning fan is arranged below the placing plate.

The invention provides a medical film and a preparation method thereof. The medical film comprises a substrate and an ink-absorbing coating covered on the substrate; wherein the ink-absorbing coating is composed of an ink powder absorbent, a dispersant, and an adhesive according to a weight ratio of (19-23):(1-4):(30-33), and a polyurethane prime coating is arranged between the substrate and the ink-absorbing coating. The invention also provides a preparation method of the medical film. The medical film is non-toxic and odorless, and has the advantages of cohesiveness, waterproofness, scratch resistance, and anti-static property; the drying speed of the medical film is very fast after the film absorbs ink, and the output image is clear and does not fade.

The invention belongs to the technical field of electric wire tools, and particularly relates to a sealed and durable conveying chain for port ship unloading equipment. The chain comprises a plurality of chain bodies, the chain bodies are provided with a plurality of chain links which are symmetrical along the center lines of the chain bodies, and the ends, away from the chain bodies, of the chain links are provided with fixing shell suites. Before the chain is used, the chain body and the chain links are assembled, after assembly is completed, the chain body is sleeved with the sealing and fixing structure, the end, extending out of the chain links, of the chain body is sealed, and then the fixing shell kit is fixed to the chain links in an abutting mode; the upper outer surface and the lower outer surface of the sealing and fixing structure abut against the chain body and the fixing shell set correspondingly, bidirectional sealing and fixing of the inner ring and the outer ring are formed, the overall structure compactness is good, the sealing effect is good, and the fixing shell set plays a role in fixing and protecting the end, extending out of the chain link, of the chain body and the sealing and fixing structure. And the service life of the whole structure is prolonged, and practicability is high.

The inventions belongs to the technical fields of manufacture of conical cement electric poles, cements communication poles and cement lamp poles and particularly relates to a centrifugal forming die and a construction method for a high-strength conical cement pole. The centrifugal forming die comprises a conical outer die, a conical inner die, an inner die large-end flange plate, a large-end prestress tensioning ring, an outer-die large-end flange plate, an outer-die small-end flange plate, a die cavity small-end closing plate, one group of running wheels, one group of bolt assemblies, a prestress locking nut, a mortar injecting port and an exhaust port, wherein the conical outer die, the conical inner die, the large-end prestress tensioning ring and the die cavity small-end closing plate form a closed annular die cavity; one group of large-end longitudinal rib inserting holes are formed in the large-end prestress tensioning ring; and one group of small-end longitudinal rib inserting holes are formed in the die cavity small-end closing plate. According to the centrifugal forming die and the construction method disclosed by the invention, the conical cement poles with the advantages of smooth inner and outer surfaces, high internal structural strength and uniformity in wall thickness can be produced. In addition, the wall thickness of the cement poles can be accurately controlled, so that the materials can be saved, the service strength of the pole bodies is ensured and the work environment of the field is improved.

The utility model discloses a circuit connector plug base body, which comprises a base body shell, a reinforcing framework is implanted in the base body shell, a plurality of uniformly distributed heat dissipation notches are formed in the upper outer surface and the lower outer surface of the base body shell, heat conduction holes are formed in the outer walls of the two sides of the base body shell, and heat conduction columns are fixedly mounted in the heat conduction holes. According to the utility model, the internal structural strength of the base body shell can be effectively improved through the embedded reinforcing framework, the impact resistance and the use reinforcing effect are better, and in actual use, the heat conduction column is made of a high-heat-conduction silica gel material, and the heat conduction column is made of a high-heat-conduction silica gel material, and a plurality of terminal grooves which are linearly distributed at equal intervals are formed in the base body shell. According to the utility model, the metal framework in the base body shell can be effectively reinforced and supported, so that the condition that the base body is cracked due to over-concentrated stress when the plug base body is plugged and unplugged can be avoided, the overall structural strength of the plug base body is comprehensively improved, the service life of the plug base body is comprehensively prolonged, and the stress damage when the plug is plugged and unplugged can be effectively resisted.

The utility model belongs to the technical field of hydraulic valve blocks, and particularly relates to a novel oil field hydraulic valve block which comprises an installation seat, a valve block body arranged at the top of the installation seat, a limiting groove formed in the bottom of the valve block body, an installation plate fixedly installed on the installation seat, a limiting pin arranged on the installation plate, a sliding groove formed in the installation seat and a sliding block arranged in the sliding groove. A fixing plate is fixedly installed at the top of the sliding block, a clamping plate is fixedly installed on one side of the fixing plate, a fixing pin is arranged on one side of the clamping plate, a fixing groove is formed in one side of the valve block body, a fixing mechanism is arranged on the sliding block, a cavity is formed in the valve block body, reinforcing ribs are arranged in the cavity, a connecting hole is formed in one side of the valve block body, and a sealing groove is formed in the inner wall of the connecting hole. According to the utility model, the sealing groove and the rubber sealing ring are arranged in the connecting hole and are matched for use, so that the sealing performance during working connection and use can be improved, and the situation that leakage is easy to occur and the working and using effects are influenced is prevented.

The laser cutting machine beam comprises a body and a base, the body comprises an outer wall, a circular ring is arranged in the center of the outer wall, the circular ring is hollow and extends to the two ends communicated with the outer wall in the axial direction of the body, the beam is provided with a guide rail and a rack, and the outer wall is provided with a guide rail groove matched with the guide rail and a rack groove matched with the rack; reinforcing ribs are arranged between the circular ring and the outer wall, and projections of the reinforcing ribs in the radial direction of the circular ring fall into the guide rail groove and / or the rack groove. Through the internally hollow circular ring, on one hand, the overall weight of the cross beam is reduced, on the other hand, the circular ring in the center of the main body can enhance the internal structural strength of the main body, through arrangement of the reinforcing ribs, the overall structural strength of the cross beam is improved, and the projections of the reinforcing ribs in the radial direction of the circular ring fall into the guide rail groove and / or the rack groove to share stress from the rack and the guide rail; the supporting stability of the cross beam in the moving process of the laser head is enhanced, and the good cutting precision of the laser cutting machine during high-speed operation is met.

The shaving board with the good sound insulation effect comprises a sleeve plate and side plates, the side plates are longitudinally fixed to the two sides of the sleeve plate, a thick plate is installed above the position between the sleeve plate and the side plates, protruding plate blocks are arranged between the front portion and the rear portion of the top of the thick plate, and lower grooves are formed between the protruding plate blocks. A layer of sound insulation pad is attached to the surface between the protruding plate block and the thick plate. According to the shaving board with the good sound insulation effect, a layer of sound insulation pad is attached to the surface between the protruding plate block and the thick plate, a layer of sound insulation pad is attached to the position between the thick plate and the clamping wood plate, under the limitation of the protruding plate block and the upper groove, the sound insulation pad is prevented from displacing, the protruding part at the other position of the sound insulation pad is also embedded in the lower groove, and therefore the sound insulation effect is good. The inner cavity is filled with some moisture absorption particles, after the clamping wood board is laid and pressed, the moisture absorption particles can be prevented from leaking out through the pressing block, the effects of sound insulation and noise reduction can also be achieved, and the problem that a shaving board cannot isolate noise is solved.

The invention relates to an insect-proof setting device used for grafting red cherry blossoms in China. The device includes an inner layer (10), reinforcing layers (20), rubber layers (30), nylon layers (40) and several volatilization blocks (50), wherein the reinforcing layers (20), the rubber layers (30) and the nylon layers (40) are sequentially arranged on the two sides of the inner layer (10), and the volatilization blocks (50) are uniformly arranged on the nylon layers (40) at intervals; the setting device is internally provided with a plurality of guide lines (60), the guide lines (60) penetrate through the setting device and extend to the outer sides of the upper surface and lower surface of the setting device, and the portions, located on the inner layer (10), of the guide lines are located in an isolation space (104); the portions, located outside the nylon layers (40), of the guide lines extend and are fixed in the volatilization blocks (50). According to the setting device, insect repellent liquid is arranged, the guide lines and the volatilization blocks are used for insect repelling, and the advantage that the insect repelling time is long can be achieved.

The utility model belongs to the technical field of automobile rear axles, and particularly relates to a high-pressure-resistance automobile rear axle structure which comprises a rear axle body, a shaft sleeve arranged on one side of the rear axle body, a limiting groove formed in the shaft sleeve, an upper axle housing arranged at the top of the shaft sleeve, a first bolt hole formed in the upper axle housing, a fixing hole formed in the upper axle housing and a lower axle housing arranged at the bottom of the shaft sleeve. A limiting pin is arranged in the lower axle housing, and a second bolt hole is formed in the lower axle housing. The left protective shell, the right protective shell, the fixing bolts and the fixing holes are used in cooperation, the left protective shell and the right protective shell can be conveniently connected and installed, the overall structural strength of the protective shell can be improved, the wear-resisting and corrosion-resisting performance of the protective shell can be improved by arranging the wear-resisting layer on the outer wall of the protective shell, and the service life of the protective shell is prolonged. And meanwhile, the anti-extrusion layer and the reinforcing ribs are arranged in the anti-extrusion structure to be used in cooperation, the internal structural strength of the anti-extrusion structure can be improved, and therefore the anti-extrusion performance of the whole structure can be improved.

The invention belongs to the technical field of manufacturing of cement poles, cement communication poles and cement lamp poles, and particularly relates to an outer mold for the cement pole molded through casting. The outer mold comprises an upper semicircular mold and a lower semicircular mold, two mold end plates, a set of transverse rib plates and a set of longitudinal rib plates, and is characterized in that two longitudinal right-angled plates are symmetrically arranged with respect to the central vertical plane of the upper semicircular mold and the central vertical plane of the lower semicircular mold and below the lower semicircular mold, a set of T-shaped hanging points are uniformly arranged at the top ends of the one set of transverse rib plates at intervals, and the two longitudinal right-angle plates are fixedly connected with the one set of transverse rib plates. According to the outer mold, the outer size and the structure of the mold are changed, an original running wheel of the outer mold is omitted, the bottom longitudinal right-angle plate support is added, so that the rigidity of the mold is increased, and meanwhile, the T-shaped hanging points are additionallyarranged at the top of the mold, so that the mold can be continuously conveyed on a roller way; and meanwhile, an automatic lifting appliance can be used for automatic grabbing and lifting and conveying operation, so that the production process of the cement pole is automated and simplified, and the production efficiency is improved.

The utility model discloses an end cover for an explosion-proof motor, which belongs to the technical field of explosion-proof motors, and comprises an end cover body, a bearing sleeve fixed in the end cover body, and a water cooling ring fixed in the end cover body and used for water circulation flow, the plurality of heat conducting plates are fixed between the water cooling ring and the bearing sleeve, and the separating ring is fixed in the water cooling ring. The sealed water cooling ring is arranged in the end cover and is matched with a heat conduction structure such as a heat conduction plate, the interior of the water cooling ring is divided into a plurality of fan-shaped heat exchange areas, the flowing time of cooling liquid in the water cooling ring can be prolonged, the heat exchange effect is improved, the contact area of the cooling liquid in the heat exchange areas and the heat conduction structure is enlarged, and the service life of the cooling liquid is prolonged. The heat exchange efficiency is further improved, the efficient cooling effect of the motor is achieved, the heat accumulation speed in the motor is restrained, and the stability and safety of long-time operation of the motor are guaranteed.

The invention discloses a construction process for buried type deep support of a semi-open and semi-dark unsymmetrical pressure tunnel. The semi-open and semi-dark unsymmetrical pressure tunnel comprises an open cut tunnel and a dark tunnel. The construction process comprises the steps that a plurality of anchoring holes are formed in the tunnel wall of the dark tunnel based on the preset tunnel entering requirement; rigid anchoring parts are put into the anchoring holes, and gaps are formed between the rigid anchoring parts and the hole walls of the anchoring holes; and the anchoring holes are filled with fillers until the anchoring holes are full of the fillers, and the fillers are combined with the rigid anchoring parts to form the tunnel support after the fillers are solidified so as to support the tunnel. According to the construction process for buried type deep support of the semi-open and semi-dark unsymmetrical pressure tunnel, the problem of deep supporting of the hole body section and the side wall of the unsymmetrical pressure tunnel can be solved, and the common problems of deformation and collapse of the side wall of the tunnel and the like in the engineering field due to failure of the supporting measure caused by damage of the supporting measure due to vibration of blasting operation are solved.

The utility model belongs to the technical field of water heater, specifically disclose a kind of probe anode sealing structure for water heater, including sleeve, the left and right between inside of sleeve is provided with horizontal groove, and the inside fixed plug-in of horizontal groove left side has inner tube, the left and right between inside of inner tube is provided with inner chamber, the right side fixedly connected with insulating sleeve in the inside of horizontal groove, anode rod is fixed with between inner tube and insulating sleeve transversely.The probe anode sealing structure for water heater is fixed plug-in with inner tube in the inside of horizontal groove left side, inner tube and insulating sleeve are filled in the left and right sides of sleeve inside respectively, and the anode rod is fixed between the two, the left side in the inside of insulating sleeve with O type sealing ring one contact anode rod, the right side of insulating sleeve outside with O type sealing ring two contact anode rod, this thing is locked firmly between inner tube and insulating sleeve, without pouring glue solution, the problem of anode rod installation, disassembly inconvenience is solved.

The invention discloses an ultra-large-area plant floor and a curing construction method thereof, and relates to the technical field of plant floors. The structure comprises a gravel base layer, a concrete cushion layer is poured at the top of the gravel base layer, a waterproof coiled material layer is laid at the top of the concrete cushion layer, a cast-in-place slab layer is poured at the top of the waterproof coiled material layer, a sealing surface layer is laid at the top of the cast-in-place slab layer, and the interiors of the concrete cushion layer and the cast-in-place slab layer are fixedly connected with grid steel bar frames. Through the double-layer foundation arrangement of the concrete cushion layer and the cast-in-place slab layer, the bearing stability and impermeability of the ground are effectively improved, the influence of differential settlement of the macadam base layer on the ground is reduced, meanwhile, the internal structural strength of the concrete cushion layer and the cast-in-place slab layer is enhanced through the arrangement of the grid steel bar frame, and the construction efficiency is improved. And when the top of the cast-in-place slab layer bears large weight, the cast-in-place slab layer is matched with the compaction assembly to extrude the side face of the macadam base layer, the macadam base layer is pushed to be compacted and gathered towards the middle, and the bearing strength of the ground is further improved.

The application discloses a light and efficient through-shaft type wheel hub motor, which comprises a through-shaft, a wheel hub shell mounted on the through-shaft, a machine core, a planetary reduction mechanism and a clutch which are sequentially assembled along the through-shaft, the clutch comprises an outer ring and an inner ring, the inner ring is fixed on the through-shaft, the planetary reduction mechanism comprises a sun gear arranged on an output end of the machine core and a plurality of planetary gears, the planetary gears are arranged on planetary shafts, the planetary shafts are fixed to the outer ring of the clutch, the sun gear is in transmission connection with a ring gear fixed to the inner side of the wheel hub shell through the planetary gears, and the planetary gears are double planetary gears, the double planetary gears comprise coaxially arranged large and small gears, the large gear is a plastic gear and is in mesh with the sun gear, the small gear is a metal gear and is in mesh with the ring gear, and an extension shaft sleeve is integrally arranged at the center of the small gear to fix the large gear. The through-shaft type wheel hub motor can ensure high output power and good internal structural strength under the premise of reducing weight, and the volume is further reduced.