11results about How to "Reduce the interaction force" patented technology

The invention relates to the technical field of copper alloy strip production, in particular to high-strength and high-elasticity copper alloy strip cold rolling equipment with a smoothing function, which comprises two cold rolling mechanisms with sequentially enhanced cold rolling effects and a plurality of cold rolling smoothing mechanisms arranged between the two cold rolling mechanisms, and the smoothing effects of the plurality of cold rolling smoothing mechanisms are sequentially enhanced. The cold rolling flattening mechanism comprises two flattening mechanisms and a pressure control mechanism; the flattening mechanism comprises two flattening structures, the flattening directions of flattening rollers in the two flattening structures on the copper alloy strip are opposite, and the flattening directions of the two flattening structures, located above the copper alloy strip, in the two flattening mechanisms on the copper alloy strip are opposite; the pressure control mechanism is used for controlling the pressure of the leveling mechanism on the copper alloy strip; the multiple cold rolling smoothing mechanisms are arranged, so that it is effectively guaranteed that the cold rolling quality of all positions of the copper alloy strip after cold rolling is uniform, and the cold rolling defects caused by unevenness of the copper alloy strip are reduced.

The application discloses a production method of base oil, which comprises the following steps: carrying out a hydroisomerization reaction on a lubricating oil base oil raw material under the action of at least one metal phosphide catalyst to obtain base oil, characterized in that the metal phosphide catalyst comprises a metal component and a carrier, the metal phosphide catalyst is subjected to twice modification treatment, the first modification is to introduce a first modification aid alkali metal and / or an acidic compound into the carrier, and the second modification is to introduce a second modification aid polyhydroxy organic compound into the metal component. According to the production method of the base oil, the lubricating oil base oil with low condensation point and low pour point can be produced by taking wax oil as the raw material and carrying out the hydroisomerization reaction on the wax oil by using the metal phosphide catalyst, meanwhile, the lubricating oil base oil produced by the application has low aromatic hydrocarbon content and high total lubricating oil base oil yield.

The invention relates to the technical field of high polymer materials, in particular to a perfluoropolyether derivative with high thermal stability, a preparation method of the perfluoropolyether derivative, a nano coating composition and application of the nano coating composition, and the perfluoropolyether derivative is composed of a K-type perfluoropolyether main chain and an amido-containing alkane chain segment connected to the tail end of the K-type perfluoropolyether main chain through an amido bond. The shielding effect of fluorine atoms on highly polarized fluorocarbon bonds on a perfluoropolyether main chain on a carbon-carbon main chain is utilized, so that the skeleton main chain is not easy to damage, and therefore, the perfluoropolyether derivative has excellent chemical stability and high temperature resistance; an alkane chain segment with a specific structure is introduced to the tail end of a perfluoropolyether main chain, so that the thermal stability of the derivative is remarkably improved; meanwhile, as fluorine atoms have relatively strong electronegativity, the interaction force among perfluoropolyether molecules is relatively small, so that the perfluoropolyether has extremely low surface tension and good hydrophobic and oleophobic properties, and has high optical transparency and good adhesive force and durability when a nano coating is formed.

The utility model discloses an excavator hydraulic pump pump cover of improved interaction force structure, including pump cover body, the pump cover body is connected through bolt between pump body, the periphery of pump cover body all movably installs the flap, is located the square groove of flap department on the pump cover body, the guide plate of being located square groove inside is fixedly installed on the flap. According to one embodiment of the present disclosure, by setting the flap, the guide plate, the clamping block and the limiting assembly, when the pump cover body is connected on the pump body through the bolt, the staff can make the flaps around the pump cover body gather each other through the limiting assembly, so that the flap moves to the middle part of the pump cover body, and then the clamping block can be inserted into the reserved slot hole on the surface of the pump body, so that when the pump cover body bears the pressure inside the pump body, the clamping block and the flap can share part of the pressure, reduce the interaction force that the bolt and the pump body thread hole receive, thereby avoiding the bolt excessive fatigue service life reduction.

The invention belongs to the technical field of building materials, and provides an early-strength functional monomer, an early-strength polycarboxylic acid water reducing agent and application of the early-strength functional monomer and the early-strength polycarboxylic acid water reducing agent. The chemical structural formula of the early strength functional monomer is as shown in formula (I). The preparation method of the early-strength polycarboxylate superplasticizer comprises the step of carrying out free radical polymerization reaction on an unsaturated polyether macromonomer, an early-strength functional monomer as shown in the formula (I), unsaturated carboxylic acid and a polysaccharide-based graft copolymer to obtain the early-strength polycarboxylate superplasticizer. The early strength functional monomer provided by the invention is obtained by reacting N-(beta-aminoethyl)-alpha-aminopropyltrimethoxysilane and an acrylic monomer, the raw materials are easy to obtain, the cost is low, the early strength functional monomer can be prepared only by one-step reaction, the synthesis process is simple, the post-treatment is convenient, the reaction condition is mild, and the early strength functional monomer can be applied to the polycarboxylate superplasticizer, so that the early strength functional monomer has a good application prospect. The polycarboxylate superplasticizer can generate a synergistic effect with the unsaturated polyether macromonomer, unsaturated carboxylic acid and the polysaccharide-based graft copolymer, so that the polycarboxylate superplasticizer has excellent early strength effect and binding material environmental adaptability. Formula (I).

The application provides a kind of polyimide prepolymer resin containing silicon and Cardo structure and a preparation method thereof, and belongs to the field of material science.The preparation method is as follows: firstly, a mixture of a synthesized structure-symmetrical diamine monomer containing silicon and Cardo structure, a commercially available structure-symmetrical dianhydride monomer and an active end-capping agent is subjected to a polymerization reaction in a suitable organic solvent;secondly, a thermosetting polyimide resin glue liquid containing a dehydration cyclization is obtained;finally, a post-treatment is performed to obtain a target product, and the molecular structure is as follows:the application has a wide melt processing window, low melt viscosity and good melt stability;no crosslinking agent needs to be added during crosslinking and curing, no volatile substances are generated, and the synthesized resin has few defects;the performance can be adjusted and controlled, has good processing technology, is low in cost and easy to industrialize.

The invention relates to the field of industrial equipment, in particular to a motor, which comprises a shell and a rotor rotatably connected to an inner cavity of the shell, the rotor comprises a yoke part and a plurality of tooth parts, the plurality of tooth parts are uniformly connected to the outer peripheral surface of the yoke part around the axis of the yoke part at intervals, and tooth grooves for winding coils are reserved between the adjacent tooth parts. The planes, facing the tooth grooves, of every two adjacent tooth parts are parallel to each other. Through the arrangement of the yoke parts and the tooth parts and the design of parallel planes, the distribution of radial force waves in the circumferential direction is more symmetrical, part of the force waves are mutually offset, the excitation effect on the stator core is reduced, the interaction force between the rotor teeth and the stator slots is reduced, and the cogging torque is reduced, so that the vibration and noise of the motor are reduced, and the service life of the motor is prolonged. And normal use of the motor by a user is ensured.

The application provides a system of bionic electro-osmosis corrugated structure of a shield cutter and a method for preventing mud cake, and relates to the technical field of shield construction. The system comprises a shield cutter and an electro-osmosis component connected with the shield cutter. The electro-osmosis component comprises a power supply, a first wire, a second wire and a plurality of crown-covered conductive units. All the crown-covered conductive units are arranged on the shield cutter and are separated from the shield cutter by insulation. All the crown-covered conductive units are connected in parallel on the positive pole of the power supply through the first wire. The shield cutter is connected with the negative pole of the power supply through the second wire. The power supply is arranged on the non-working surface of the shield cutter. The method comprises continuously electrifying the electro-osmosis component during the operation of the shield cutter, so that the thickness of the water film layer is increased to reduce the interaction force between the mud cake soil layer and the working surface of the shield cutter, the mud cake soil layer is facilitated to fall off, and the purpose of preventing mud cake is achieved.

The invention discloses soluble polyimide resin with high temperature resistance and stable thermal size as well as a preparation method and application of the soluble polyimide resin. The soluble polyimide resin has a structure as shown in the following formula, n is more than 0 and less than or equal to 10, and X is more than or equal to 0.5 and less than 1. The polyimide resin provided by the invention has the characteristics of low melt viscosity, high solubility, stable thermal size of a cured product and ultrahigh heat resistance, and solves the technical problems of poor manufacturability, high thermal expansion coefficient of the cured product, insufficient heat resistance and poor interface of a composite material in the existing thermosetting polyimide resin.

This invention discloses a multimodal aerodynamic space exploration robotic arm based on the tristable characteristics of Kresling origami. The robotic arm includes origami units, each containing an airbag. By using Kresling origami as the unit structure, this invention ensures the robotic arm's lightweight design while reducing the interaction forces between the robotic arm and the target object during exploration, thus improving structural reliability and effectively adapting to the special environment of microgravity in space. The origami structure of this invention achieves a third stable state with high stiffness and stability on specific surfaces through the expansion of the airbag inside the unit. This breaks the original deformation mode of Kresling origami, increases bending motion, and allows for programmable control of the airbag's state, enabling the robotic arm to achieve full-circumference bending and diverse motion modes. This effectively improves the ability of continuous robotic arms to perform complex tasks and promotes the development of origami structures in the field of soft robotic space exploration technology.

This invention discloses a graphene-reinforced TPU adhesive and its preparation process, relating to the field of polyurethane materials technology. The invention involves mixing epoxy resin and a silane coupling agent, reacting them under the catalysis of dibutyltin dilaurate to obtain a silane epoxy resin, which is then reacted with isophorone diisocyanate and polytetrahydrofuran ether diol to obtain a polyurethane prepolymer solution. Modified graphene is then added, dispersed at high speed, and a chain extender and curing agent are added. The mixture is heated to react, and after the reaction is complete, cooled to room temperature to obtain the graphene-reinforced TPU adhesive. This invention improves the mechanical strength and thermal stability of the TPU adhesive by adding modified graphene. Surface modification of graphene is achieved by using quaternary ammonium salt didodecyl dimethyl ammonium bromide as a graphene modifier. The intercalation reaction between didodecyl dimethyl ammonium bromide and graphene oxide reduces the interfacial energy between graphene and thermoplastic polyurethane, enhancing the dispersibility and barrier properties of the TPU adhesive.