60results about How to "Small impact resistance" patented technology

The invention discloses an agricultural smashing machine. The agricultural smashing machine comprises a driving unit, a crankshaft, N connecting pieces, N connecting rods, N striking pieces and a box; the driving unit is connected with the crankshaft in a transmission manner to drive the crankshaft to rotate; the crankshaft is horizontally arranged and comprises N connecting shaft necks; the N connecting pieces are rotationally connected with the N connecting shaft necks respectively; and one ends of the N connecting rods are rotationally connected with the N connecting pieces. The agricultural smashing machine is good in material processing effect and high in material processing efficiency.

The invention relates to a solvent-free polyurethane wear-resistant terrace paint and a preparation method thereof. The paint is composed of a component A and a component B, wherein the component A comprises the following components by mass parts: 60-80 parts of solvent-free hydroxyl-terminated epoxy resin, 1-13 parts of coloring pigment, 15-22 parts of wear-resistant filling material, 0.2-0.5 part of defoaming agent, 0-0.3 part of drier and 3-5 parts of oxazolidine dewatering agent; and the component B is 100 mass parts of solvent-free isocyanate-terminated prepolymer. When the paint is used, the component A finished product and the component B finished product are mixed and stirred uniformly at a ratio of 3:1 to obtain the solvent-free polyurethane wear-resistant terrace paint. According to the invention, the terrace paint can be cured at low temperature, is free of volatile organic compounds in the system, is low in residual isocyanate monomer content, can improve coating performance, and is suitable for terrace decoration and protection with wear-resistant and dustless requirements in plants, shops, guesthouses, gymnasia, stations, parking lots and other places.

The invention discloses an oil-natural gas drilling PDC drill bit, which comprises the following parts: drill body, main knife-wing, second knife-wing, big diameter PDC cutting part, small diameter PDC cutting part and nozzle, wherein the main knife-wing and second knife-wing appear in pairs and interseparate upwards on the drill; big diameter PDC cutting part is fixed on the main knife-wing and small diameter PDC cutting part is fixed on the second knife-wing; the thickness and back inclination angle of big diameter PDC cutting part are less than the small diameter PDC cutting part's; the outcropping height of big diameter PDC cutting part is higher than small diameter PDC cutting part's. The structure can drill in the alternative hard-and-soft formation effectively.

The invention discloses a harmonic speed reducer with an improved structure, which includes a cross roller bearing, an elliptical wave generator, a flexible bearing mounted on the elliptical wave generator, a circular flexible wheel installed on the flexible bearing, and an outer flexible wheel rigid wheel; the flexible bearing is a cylindrical roller flexible bearing. The invention has a reasonable structure, can greatly increase the output torque of the double rigid wheel harmonic reducer, greatly improve the load capacity and impact resistance of the harmonic reducer, and reduce the processing cost of the flexible bearing and the assembly difficulty of the harmonic reducer.

The polypropylene film of the present invention satisfies the following formula: TM≥12.5×HST-900, where TM is the tensile modulus (MPa), and HST is the heat-sealing temperature (°C). The polypropylene film has a good balance between tensile modulus and heat sealing temperature, is less tacky, and has excellent processability, clarity and impact resistance. The invention also discloses a multi-layer polyolefin resin laminated material, wherein at least one outermost layer is made of the above-mentioned polypropylene film. The laminate has a good balance between tensile modulus and heat sealing temperature, is less tacky, and has excellent slip and antiblock properties.

The invention provides a manufacture method for a small spiral bevel gear. The method prepares a screw bevel gear with a taper angle less than 40 degrees through one time sintering, overcomes the detects existed in the exiting processing technique for the small spiral bevel gear and is suitable for power metallurgy manufacture, and has the advantages of convenient and simple technique as well as low cost. The invention uniformly mixes iron powder, alloy powder and suitable lubricant according to a certain proportion, spirally pressing and spirally depanning in a master form closed cavity die space, acquires the screw bevel gear with a taper angle less than 40 degrees through one time pressing and then sinters in a sintering furnace under 1120 DEG C with a protection atmosphere of cracked ammonia or nitrogen based atmosphere. The gear acquired through the technique has the advantages of simple structure, low cost and good batch consistence, etc., and acquires the screw bevel gear with a taper angle less than 40 degrees through one time pressing.

The invention discloses a preparation method of a carbon fiber reinforced polyimide fiber metal laminate, belonging to the technical field of composite materials. The preparation method of the carbon fiber reinforced polyimide fiber metal laminate comprises the following steps: cutting a metal plate and a carbon fiber reinforced polyimide prepreg to reach required sizes; cleaning the metal plate; performing anode oxidation on the metal plate; painting a primer on the surface of the processed metal plate and alternatively spreading and placing the metal plate coated with the primer and the prepreg in a mould, warming and pressurizing the spread metal plate and prepreg for being cured; and after curing is ended, naturally cooling to obtain the carbon fiber reinforced polyimide fiber metal laminate. The carbon fiber reinforced polyimide fiber metal laminate prepared by adopting the preparation method has excellent characteristics of high temperature resistance and fatigue resistance, has the advantages of corrosion resistance, inflame retardance, impact resistance and the like, and can be widely applied to the aerospace field; the cost of the carbon fiber reinforced polyimide fiber metal laminate is far lower than that of a carbon fiber reinforced composite material.

The invention relates to a method for producing an electrical contact material, particularly relates to a method for producing a high-energy rare earth powder alloy electrical contact material. According to the technical scheme provided by the invention, the method for producing a high-energy rare earth powder alloy electrical contact material is characterized by comprising the following steps of: firstly, completely mixing and stirring alumina powder, silver powder, lanthanum powder, graphite powder, molybdenum powder, yttrium powder, boron powder and nickel copper powder; secondly, using anoil press to squeeze and mold the powder, and then sintering the squeezed and molded object into a vacuum high-temperature furnace and then cooling; thirdly, burning the molded object in a high-temperature furnace, then taking out and squeezing the burnt object into a panel shape by using a die on the oil press, and then cooling with cold water, and finally using a machine tool to punch the cooled object into a contact. The invention overcomes disadvantages of the prior art and provides the method for producing an environment-friendly high-energy rare earth powder alloy electrical contact material with low silver content, impact resistance, corrosion resistance, antioxidation, low resistance and good electrical conductivity.

The invention belongs to the technical field of macromolecular synthesis and particularly discloses a preparation method of polyether-ether-ketone suitable for 3D printing. The preparation method comprises the following steps: by taking sodium carbonate and potassium carbonate as a reaction condensating agent, hydroquinone and 4,4-diflouro diphenyl ketone as raw materials and diphenyl sulfone as a solvent, performing a temperature-raising temperature; and then performing cooling, crystallizing and impurity removal and drying to obtain the polyether-ether-ketone. In the reaction process, the solvent is excessive, and the salifying process is stable and controllable in reaction; the problem of winding the molecular chains is reduced by means of ultrasonic treatment, and the uniformity of a product is improved; the flowability of the polyether-ether-ketone product is improved, and the processing property is excellent; and performances such as strength, impact resistance, corrosion resistance, acid and alkali resistance, dimensional stability, adhesion and the like are improved.

The invention discloses a furrow rotary excavating cutter disc. The furrow rotary excavating cutter disc comprises a cutter disc body, a shaft hole, a cutter and notches. The shaft hole is formed in the center of the cutter disc body. The cutter disc body is circular and the notches are evenly formed in the periphery of the cutter disc body at intervals, so that the structure that the notches and the outer end face of the periphery are evenly distributed in an alternating mode is formed; the cutter perpendicular to the cutter disc body is arranged on the outer end face of the periphery in the radial direction. The device is high in structural strength, high in cutting efficiency and capable of rapidly throwing cut soil out of a furrow, and therefore the furrow which is large in depth, not prone to collapse and small in soil returning amount and is provided with flat furrow banks is formed. The invention further provides a double-disc furrow rotary excavating device.

A travel switch comprises a substrate (1), a supporting seat (2), an electric connector (3), a spring (4), a rotating shaft component (5), a clamping block (6), a brake block (7), a piston (8), a clamping post (9), contact pieces (10), a spring plate component (11) and an end cover (12), wherein the supporting seat (2) is fixedly connected to the substrate (1), the electric connector (3) is connected with the supporting seat (2),and the rotating shaft component (5) is positioned on the inner side of the substrate (1). The travel switch has the advantages of small size and small mass; because a casing is totally made of metal, the shielding and sealing effects are good, and the travel switch is free from height change influence; the components have the advantages of higher reliability, shock resistance, vibration resistance, and good accelerating effect; outputting is performed by the connector, so that but joint with mating parts is facilitated; the spring is adopted for controlling the rotating shaft component, so that the synchronicity of the product is good, and the switching time is short; the technical performance is good, and the switch can be used at a temperature between minus 55 DEG C to 70 DEG C.

The invention relates to a clamping insertion strip with a compound skeleton, which comprises an insertion strip main body made of a hard modified PVC material. The insertion strip main body is an S-shaped structure, and one layer of clamping body made of a soft modified PVC material is compounded on the external surface of the starting straight section of the S-shaped insertion strip main body. The clamping body is provided with a clamping strip convex body for clamping a clamping body assembly in a stretching way in the extension direction of the starting straight section, and an enhancing skeleton is embedded between the clamping body and the compounding surface of the starting straight section of the insertion strip main body or in the starting straight section. The insertion strip main body, the enhancing skeleton and the clamping body are integrally compounded extrusion parts. The steel enhancing skeleton has high strength, small influence by temperature difference, small contraction distortion and strong impact resistance, and the expansion and contraction of the clamping insertion strip is reduced. The stainless steel insertion strip not only can be wrapped but also can be exposed and is beautiful in appearance. The clamping insertion strip provided by the invention has the advantages of small contraction distortion, strong impact resistance, small contraction gap in clamping insertion strip joint, good weather resistance, beautiful appearance and long service life and is an ideal substitute for the prior art.

An object of the present invention is to provide a chain drive system that can reduce sliding resistance between a chain and a guide shoe, minimize increase of sliding resistance over time, and reduce production cost. Provided is a chain drive system 100 including a plurality of sprockets 101 and 102 over which a chain 130 passes over, and one or more guides 110 and 120 that guide the chain 130. The guides 110 and 120 include integral or separate guide shoes 111 and 121 each having a chain running surface. The chain running surfaces include, in part thereof, a lubricated area 114 where a solid lubricant P is held.

The invention relates to a sandwich heat-preserving decorative board with mixed hollow porous fiber reinforced heat-preserving mortar and a manufacturing method.A heat-preserving core veneer of the heat-preserving decorative board is a formed veneer and provided with big and round through holes; a hanging part capable of being positioned is arranged at the inner side of a back plate and tightly attached to the back face of the heat-preserving core veneer, and the same big and round through holes are formed in the positions corresponding to the big and round holes in the heat-preserving core veneer; the ends of the hanging part capable of being positioned are provided with small and round holes, square holes and right-angled hooks used for connecting, installing and lapping the heat-preserving decorative board in a positioning mode; fiber grid cloth is arranged at the inner side of a panel and is spaced from the heat-preserving core veneer by 2 mm; the mixed hollow porous fiber reinforced heat-preserving mortar is poured into the periphery of the heat-preserving core veneer through sealed formworks, the panel, the back plate and sealed edges are formed after the mortar is hardened, and bridge-cutoff shear connectors are formed in the big and round holes; the decorative board has the advantages that a good integrated space stress structure is formed through overall pouring of the panel, the back plate, the bridge-cutoff shear connectors and the sealed edges, positioning and splicing are accurate, and the fireproof performance is improved.

The invention discloses a lifting structure applicable to a high-speed printing system of a bubble cap machine. The lifting structure is characterized by comprising a lifting driving servo main motor at the left side of a lifting structure body and a lifting-rod auxiliary motor for controlling the position of the lifting structure body, and the lifting structure body comprises a weight bearing platform, sliding pipes and lifting auxiliary screws, wherein the sliding pipes are fixedly arranged between the weight bearing platform and the lifting auxiliary screws in an H shape; a lifting main screw for controlling the lifting of the left and right sliding pipes is arranged at the middle of the horizontal plane of the left sliding pipe and the right sliding pipe, and is connected with the lifting driving servo main motor; the lifting driving servo main motor and the lifting-rod auxiliary motor are linked with the lifting main screw and the lifting auxiliary screws by synchronous wheels and a synchronous wheel belt to commonly act on the weight bearing platform to drive the weight bearing platform to go up and down; the upper end and the lower end of a frame wall rod at the left side of one lifting auxiliary screw are provided with a front limiter and a rear limiter from top to bottom. The lifting structure disclosed by the invention has the advantages that the lifting transmission is smooth, the transferred power is large, the transmission efficiency is high, the heat resistance is good, lifting transmission noise is low, the impact resistance is achieved, the electrical conductivity is good, the flexural property is good and the like.

The invention provides hyperbranched epoxy resin and a preparation method and application thereof. The hyperbranched epoxy resin is formed by taking ethylenediamine tetraacetic acid as a first core monomer and organic alcohol as a second monomer, synthesizing a hyperbranched polymer through esterification reaction and then polymerizing the hyperbranched polymer with an epoxy group to form the hyperbranched epoxy resin. The hyperbranched epoxy resin is controllable in structure, low in viscosity, high in toughness and resistant to high temperature, and can well meet the requirements in the fields of electronics, aerospace, structural materials and the like.

The invention relates to the technical field of adhesives, in particular to a preparation method of a heat-resistant high-strength agricultural machine adhesive, which is wide in raw material source,simple and convenient in preparation method and excellent in thermal performance, and utilizes modified polyesterimide and modified vinyl ester resin to blend, blend and crosslink. The insulating paint can be stored, has low curing temperature, can be used in occasions with high insulation grade such as agricultural machinery repair and maintenance, has good effect in repairing parts with abradedsurfaces, can replace the commonly used electric welding, electroplating and bushing processes to recover the original geometrical shapes and dimensions of the parts, and has the advantages of simpleprocess, low cost, high efficiency and the like. During repairing of agricultural machinery and tools, the repairing agent has the excellent characteristics of convenience in use, wide raw material source, heat resistance, impact resistance and high corrosion resistance, and is suitable for being applied in the range of agricultural machinery.

The invention discloses an antistatic access floor. The antistatic access floor is provided with an antistatic surface layer, an upper kraft paper layer, an upper honeycomb layer, a middle kraft paper layer, a lower honeycomb layer, a lower kraft paper layer and a bottom surface layer which are sequentially arranged inside the antistatic access floor from top to bottom via peripheral sealing edges; the size of the antistatic surface layer, the size of the upper kraft paper layer, the size of the upper honeycomb layer, the size of the middle kraft paper layer, the size of the lower honeycomb layer, the size of the lower kraft paper layer and the size of the bottom surfaced layer are matched with sizes of the peripheral sealing edges, and surfaces of the various layers are adhered with one another by antistatic glue; kraft paper and phenolic resin glue are compounded to form each of the upper kraft paper layer, the middle kraft paper layer and the lower kraft paper layer; the upper honeycomb layer is made of aluminum alloy materials, and first orthohexagonal through holes are fully distributed on the upper honeycomb layer from top to bottom; and the lower honeycomb layer is made of aluminum alloy materials, and second orthohexagonal through holes are fully distributed on the lower honeycomb layer from top to bottom, and the side length of each first orthohexagonal through hole of the upper honeycomb layer is smaller than that of each second orthohexagonal through hole of the lower honeycomb layer. The antistatic access floor is light, impact-resistant and soundproof, and is high in strength and flame resistance, low in water absorption and good in heat-insulation effect.