146results about How to "Increase resistance to movement" patented technology

The gradient composite coating layer for continuous casting crystallizer copper plate contains Co in 50-79.9 vol%, Ni in 20-49.9 vol% and Al2O3 grains of size below 0.5 micron in 0.1-10 vol%. The coating is in gradient structure with outwards gradually increased Co and Al2O3 content and decreased Ni content. During production of the composite coating layer, inside amino sulfonate system with Al2O3 grains in 10-80 g / L and size below 0.5 micron added, gradient Co-Ni-Al2O3 coating is deposited onto copper or copper alloy via specific Al2O3 grain activating pre-treatment and electric deposition process. In the activating pre-treatment, FC-4 cation surfactant is used as ion dispersant. The composite Co-Ni-Al2O3 coating may be used in various high temperature wear resisting fields widely.

The present invention discloses an improved rotary forced-air cooler, which comprises a double layer trolley, a supporting beam structure, a material blocking proof air duct sealing plate arranged at the connecting part of the double layer trolley and an air supplying system, a double layer trolley unit static seal device and an air duct device. The supplying system structure is based on a rectangular beam, a triangle beam is arranged on the rectangular beam, and a plurality of ventilation channels are arranged on the bevel edge steel plates at the both waists; an air duct pipe is arranged on the air vent of the material blocking proof air duct sealing plate, an inclined plate inclining upwards from the air vent at the bottom part of the air duct pipe has a transition to a horizontal plate, a stopping ventilation fence is added to the air duct pipe at the side of the trolley; two rubber sealing parts with extended bottom edges are arranged at the outer sides of the lower parts of inner and outer sealing plates of the double layer trolley unit static seal device, an ash baffle plate which can move up and down is hung at the inner side; an air water sealing wave subduing device adopting a damping plate is arranged on the air duct device. The present invention further improves the sealing performance of the equipment, and reduces energy consumption and pollution.

The invention discloses a method for measuring the maximum scour depth of a viscous debris flow gully bed and the application thereof. The method comprises the following steps: weight Gamma1, depth h and a dynamic friction angle Beta of a viscous debris flow body, weight Gamma2, an internal frictional angle Phi and a viscosity coefficient C of cumulus deposits of an original gully bed, and vertical gradient J of the gully channel are determined by means of survey, measurement and sampling of the debris flow gully, testing of debris flow characteristic parameters and the like; and the obtained parameters are substituted into a calculation formula to obtain the maximum scour depth of the viscous debris flow gully bed. The method is applicable to the design of foundation embedded depth in a viscous debris flow prevention project, and the obtained maximum scour depth of the viscous debris flow gully bed serves as the minimum foundation embedded depth in the prevention project. Compared with the prior art, as the method is based on rigorous theory derivation, the maximum scour depth of the viscous debris flow gully bed can be reasonably determined, and references on the design of the foundation embedded depth in the prevention project are provided; and the method is high in result accuracy and can meet the requirements of the practical project.

The invention relates to the field of materials added to a filter stick of a cigarette, in particular to a method for preparing the expanded stem granules for the filter stick of the cigarette; the invention aims to greatly improve the production efficiency by further optimizing the process for preparing the expanded stem granules applied to the filter stick of the cigarette and achieves better technical effect of the prepared expanded stem granules. The method comprises the following steps: firstly, conducting the microwave expansion treatment on a stem; conducting the conditioning treatment on the expanded stem; granulating the conditioned stem, namely, allowing the conditioned stem to enter a granulation device, and subjecting the conditioned stem to granulation and screening, so as to obtain stem granules with the granule diameters being 26 to 40 meshes; then, conducting the recovery-sizing treatment on the stem granules, namely, placing the stem granules in a recovery-sizing device, and dewatering the conditioned stem under the microwave action until the water content is 3% to 9%; and finally, cleaning, namely, cleaning the sized stem granules to remove dust.

The invention relates to a distance adjustment tool for assembly of a circuit breaker and an assembly for a crank arm box of the circuit breaker. The distance adjustment tool comprises a crank arm limitation structure which is detachably assembled on the corresponding crank arm box during use for limiting the swinging of an input crank arm, the distance adjustment tool also comprises an adjustment rod arranged on a corresponding switching brake bar in series, and an adjustment screw rod is arranged on the adjustment rod and is in threaded connection with the switching brake bar for adjusting the distance between a corresponding movable contact and a fixed contact. The distance adjustment tool for the assembly of the circuit breaker, provided by the invention, can be used for adjusting the distance between the movable contact and the fixed contact and ensuring that inclined angles of input crank arms of different phases are consistent.

The invention discloses an aluminum matrix composite plate rolling method and belongs to the field of metal matrix composite molding machining. According to the method, on the basis that the density of a composite billet used for rolling is regulated, a plate blank is manufactured through multidirectional free forging and extruding, and the thickness of a rolled plate is 1-150 mm; sectional temperature rolling is adopted, cogging and reversing rolling are both conducted in a recrystallization temperature region so as to avoid detects generated in subsequent rolling, the rest of passes are subjected to large deformation rolling at a dynamic recovery temperature, and the rolling efficiency is improved; the regions of the rolling temperature and the rolling speed are narrowed so that organization can be precisely controlled and detects can be avoided; and medium and low temperature finish rolling is adopted so as to ensure the plate performance. In this way, the manufactured aluminum matrix composite plate has high strength and good corrosion resistance and fatigue resistance, and efficient rolling of large-size plates can be achieved.

The invention discloses a bead feeding mechanism for a bead embroidery machine and the bead embroidery machine. The bead feeding mechanism comprises a bottom plate with a bead pushing sliding groove,and a bead pusher which slides front and back along the bead pushing sliding groove, wherein the bead pusher comprises two clamping pieces which can be relatively clamped or opened, clamping heads arearranged on the front portions of the clamping pieces, clamp notch grooves for clamping beads are formed in the inner sides of the clamping heads, and the front of the clamping head of one of the clamping pieces is provided with a stopper which extends to the front side of the clamping head of the other clamping piece. In the bead pushing process of the bead pusher, embroidery threads penetratinginto a cloth cover move upwards, and the stopper stops the embroidery threads from entering the clamp notch grooves. By means of the technical scheme, in the embroidery process, when the two clampingpieces are clamped and the beads are clamped through the clamp notch grooves to be pushed forwards, the embroidery threads penetrating into the cloth cover move upwards to be close to the clamping heads, because of stopping of the stopper, the situation that the embroidery threads enter clamping notches through gaps between the threads to make contact with the beads cannot be generated, and therefore, the problem of bead scattering can be solved.

The invention relates to a multifunctional floor brush comprising a floor brush surface cover, a floor brush base plate, an air inlet arranged on the floor brush base plate and for dust-containing air flow entrance, and a floor brush connection pipe connecting a dust collector. A brush bar scraping dust on the floor and a first elevating structure driving the brush bar to move up and down are arranged close to the air inlet, and a second elevating structure lifting the floor brush base plate to change a distance between the floor brush base plate and the to-be-cleaned floor. The multifunctional floor brush can meet a demand of high dust collecting capacity of ERP and use comfortableness and flexibility under different conditions; mobile resistance of the floor brush can be reduced; large particles can be easily absorbed, so damage to the floor by large particles can be reduced; and the multifunctional floor brush has great practical meaning.

The invention discloses a low-noise mechanism and a lock with the same. The low-noise mechanism comprises a rack (1). One end, in the length direction, of the rack (1) is mounted on a spring bolt component (10); the rack (1) is meshed with a transmission gear (6); an energy-storage flywheel (7) is fixedly arranged on and is coaxial with the transmission gear (6). The lock with the low-noise mechanism comprises a lock shell, the spring bolt component (10), a driving component and the low-noise mechanism. The lock shell is provided with a faceplate. A spring bolt hole is formed in the faceplate. The spring bolt component (10) comprises a spring bolt and a guide plate fixedly connected with the spring bolt. The driving component is used for driving the spring bolt component (10) to extend or retract. By the low-noise mechanism, the technical problem that noises are generated due to the fact that abnormal sounds are caused during collision between the spring bolt and a pin hole of a door fame when the spring bolt extends in the prior art is solved.

The invention proposes a hydraulic oil cylinder, a hydraulic system and engineering machinery. The hydraulic oil cylinder comprises a cylinder barrel, a piston and a piston; the piston divides the cylinder barrel into a rod cavity and a rodless cavity; the rod cavity is communicated with an oil port of the rod cavity; the rodless cavity is communicated with an oil port of the rodless cavity; meanwhile, the piston or the piston rod is axially and movably provided with a first movable buffer sleeve; a first overflow valve is connected between the rodless cavity and the oil port of the rodless cavity, and is used for opening after the pressure of the rodless cavity reaches preset pressure; and / or, the piston or the piston rod is axially and movably provided with a second movable buffer sleeve; and a second overflow valve is connected between the rod cavity and the oil port of the rod cavity, and is used for opening after the pressure of the rod cavity reaches preset pressure. The hydraulic oil cylinder is stable in buffer pressure at the final travel thereof, can adjust the buffer pressure through adjusting the opening pressure of the first overflow valve and / or the second overflow valve, and is convenient to adjust and excellent in buffer effect.

The invention provides a vertical lift with a multi-stage electromagnetic auxiliary braking energy saving safety device. According to the vertical lift, a control device is arranged at top of a lift car. A traction machine and pulley assembly is arranged above the lift car. A speed governor is arranged on one side of the traction machine and pulley assembly. A rope above the lift car is connected with a counterweight through the traction machine and pulley assembly and the speed governor. A traction machine of the traction machine and pulley assembly is connected with a rotary shaft of an electric generator. The electric generator is connected with an energy storage battery through a connecting line. A left electromagnet and a right electromagnet are mounted on the left side and the right side of the lift car correspondingly. Iron plates are fixedly mounted on the inner walls of a hoistway. The iron plates on the left side correspond to the left electromagnet. The iron plates on the right side correspond to the right electromagnet. Braking force of the vertical lift can be increased, and the problem of lift slippage due to insufficient lift mechanism braking force is solved advantageously; and meanwhile, motion resistance is increased, the operating speed of overspeed or stall lifts can be decreased advantageously, the safety and reliability of the lift are improved, and personal injuries to passengers are reduced.

The invention provides a hazelnut, chocolate and milk compound protein drink and belongs to the technical field of vegetable protein drinks. The drink comprises the components, by weight, of 30-80 parts of milk, 3-7 parts of white sugar, 0.2-6 parts of hazelnut sauce, 1-5 parts of grain powder, 1-3 parts of grated hazelnuts, 0.1-3 parts of cocoa powder, 0.1-2 parts of cocoa butter, 0.1-0.5 part of compound emulsification thickening agent, 0.01-0.1 part of essence and the balance of water. The invention further provides a production technology of the drink. According to the hazelnut, chocolate and milk compound protein drink, various nutritional ingredients of the milk, hazelnuts, grain powder and the like are added, so that the milk protein and the hazelnut protein are reasonably matched, dietary fiber is added, the product stability problem can be solved by adding small amount of emulsification thickening agent, the technology is suitable for current vegetable protein general technologies, and the requirement of stable product shelf life under different packages is met.

The invention relates to a mechanical part for a vehicle video disc playing and video displaying device, where the CD suction inlet of a suction CD loading device in a machine seat is arranged to the front; a CD entrance at the middle-upper part of a cover frame fixed in front of the machine seat corresponds to the CD suction inlet; a display screen component is in front of the cover frame and the upper end of the display screen component can slide, relative to the cover frame. A moving part arranged in the machine seat can move front and back, relative to the machine seat and the connection seat of the moving part runs through the cover frame and is rotationally connected with the lower part of the display screen component though the front end; thus, as the moving part is at the back end relative to the machine seat, the display screen component is in a vertical state so as to cover the CD entrance on the cover frame; as the moving part is at the front end relative to the machine seat, the front end of the connection seat and the lower end of the display screen component extend forward out of the cover frame, so that the display screen component is in an inclined state to expose the CD entrance on the cover frame, thus able to adopt a larger-area display screen.

The invention discloses an electronic ink. The electronic ink comprises an electrophoretic disclosing solution, wherein the electrophoretic disclosing solution is electrorheological fluid which essentially consists of basal fluid, solid particles and an additive, wherein the volume percent of the solid particles in the mass of the electrorheological fluid is 5%-50%, and negative electrorheological fluid is preferably selected as the electrophoretic disclosing solution. The invention also discloses electronic paper containing the electronic ink. The invention further discloses a display method of the electronic paper. The viscosity of the electrophoretic disclosing solution is changed by changing the strength of an electric field applied to the electrophoretic disclosing solution, so that the viscosity of the electrophoretic disclosing solution can be reduced when dynamic images are switched and increased when static images are maintained so as to realize faster dynamic image switching and better static image maintaining with the electronic ink.

The invention belongs to the field of tertiary oil recovery, and particularly relates to an amphiphilic polymer oil-displacing agent with a biquaternary ammonium salt long chain structure and a preparation method of the amphiphilic polymer oil-displacing agent. For the technical problem that the salt resistance of an oil-displacing agent adopted in the prior art is frequently poor, the oil-displacing agent with good salt resistance, viscosifying action and shear resistance is provided. Firstly, N,N-dimethylhexadecylamine and cis-1,4-dichloro-2-butene are taken as raw materials to synthesize adouble-branched cationic hydrophobic monomer N,N'-bis(hexadecyl dimethyl)-1,2-chloride-2-butene-ammonium salt (CC16-DMBAC), then the CC16-DMBAC and acrylic amide (AM) perform copolymerization, a cationic group and a hydrophobic long chain are introduced onto an acrylic amide main chain, so that polymer molecules form a three-dimensional network structure with a certain strength by virtue of a hydrophobic interaction function among the molecules, and the oil-displacing agent has viscosifying action and good shear resistance and salt resistance.

The invention relates to OMMT modified anticondensation ice emulsified asphalt and a preparation method thereof, and relates to the technical field of preparation of road maintenance materials. The method comprises the following steps: performing organification treatment on Na-MMT to obtain organic montmorillonite, preparing a mixed soap liquid by using OMMT and an emulsifying agent as raw materials, and adding the mixed soap liquid into matrix asphalt to prepare the modified emulsified asphalt having excellent anticondensation ice performance. The method provided by the invention has the beneficial effects that the mixed soap liquid prepared from the organic montmorillonite and the emulsifying agent is used as a modifying agent of the asphalt, the contact angle of the obtained emulsifiedasphalt is greatly improved relative to the matrix asphalt and ordinary emulsified asphalt, so that bonding strength between frozen water and a road layer is reduced, and the anticondensation ice performance of the emulsified asphalt is improved; the storage stability of the emulsified asphalt is improved, and the anti-aging property is improved; fog seal layer treatment is performed on a road surface by the emulsified asphalt, and the method has the advantages of high efficiency, no consumption, simple construction, relatively-low costs and no pollution.

With a display device in which a main display component is supported in a tilted orientation by a stand unit, the leg of the stand unit will not be pushed in, causing the main display component to readily fall over backwards, even if the main display component in a tilted orientation should be accidentally pushed by hand. A stand unit A has a slider 2 affixed to the upper end of a leg 3, a case 1 that houses the slider 2, and a slider position restriction means 5 for restricting the slider 2 to two positions: an upper position and a lower position. The slider position restriction means 5 is equipped with a cam component 6 and a spring 7. The spring 7 has an engagement component 71, and the cam component 6 is equipped with a upper latching component 61, a lower latching component 62, and a wavy serrated face 65 that links these. The function of increasing the moving resistance when the engagement component 71 moves is imparted to the serrated face 65.

The invention discloses a main water supply bypass regulating valve. The main water supply bypass regulating valve comprises a valve body, a valve deck, a valve base, a valve element, a valve cage, a valve rod and an execution mechanism. The valve body is provided with an inlet channel, an outlet channel and a transfer channel. The valve element is arranged in the transfer channel. The valve element is sleeved with the valve cage. The valve cage is arranged at the intersecting position between the transfer channel and the inlet channel in a sealing and covering mode. Water seepage holes of the valve cage are formed in the wall, intersecting with the inlet channel, of the valve cage. The valve rod penetrates through the valve deck. The execution mechanism is installed on the valve deck. The first end of the valve rod is connected with the execution mechanism. The second end of the valve rod is connected with the valve element. A pressing ring is arranged on the position, connected with the valve rod, of the valve element in an overlapping mode. The valve element, the pressing ring and the valve rod are connected through fasteners. The opposite positions of the valve element and the pressing ring are fixed and located through fixing and locating parts. Through multiple and multipoint connecting and fastening, the connection stability of the main water supply bypass regulating valve is improved, and the service life of the main water supply bypass regulating valve is prolonged.

The invention discloses a preparation method of amphoteric cellulose ether for drilling fluid, and belongs to the technical field of cellulose ether preparation. The preparation method comprises the steps: firstly, under an alkaline condition, cationic hydroxyethyl cellulose ether is obtained by etherification reaction of active hydroxyl on a molecular chain of hydroxyethyl cellulose and epoxy chloropropane, and then a viscous filtrate, namely 3-chloro-2-hydroxypropyl dimethylammonium acetate, is prepared, so that the motion resistance of water molecules is increased, and the cellulose ether has an excellent water loss reduction function in the drilling fluid; the number of anion groups in the amphoteric cellulose ether and the number of cation groups in the amphoteric cellulose ether areroughly equal, the electrostatic interaction force in the molecular chain is only electrostatic attraction force, resulting in contraction of polymer molecules, decrease of the hydrodynamic volume anddecrease of the viscosity of a solution, so an obvious antipolyelectrolyte solution behavior is showed, a large consistence can be still kept when the water content in the drilling fluid is high, andthe permeability of a salt solution is weakened, so the salt tolerance of the amphoteric cellulose ether in the drilling fluid is improved, and the prospect of application is broad.

The invention relates to a carbon-fiber-reinforced polyformaldehyde gear which is prepared from polyformaldehyde resin, chopped carbon fiber, molybdenum disulfide, calcium stearate, coupling agent and phenolic resin. The invention also relates to a preparation method of the carbon-fiber-reinforced polyformaldehyde gear, which comprises the following steps: carrying out composite surface treatmenton the carbon fiber; and putting the raw materials into a high-speed mixer according to the percentage in the formula, sufficiently mixing, granulating, and carrying out injection molding in an injection molding machine. The composite surface treatment, which is carried out on the chopped carbon fiber, greatly improves the wettability of the carbon fiber surface, and maximally enhances the interfacial adhesiveness between the carbon fiber and the polyformaldehyde matrix, thereby greatly enhancing the mechanical properties of the composite material. The gear prepared from the carbon-fiber-reinforced wear-resistant polyformaldehyde has the advantages of low specific gravity, low noise, favorable wear resistance, favorable self-lubrication effect, chemical corrosion resistance, high specificstrength, large specific modulus, small thermal expansion coefficient, static resistance and the like, and does not produce sparks, thereby being capable of replacing the original steel part. In addition, the invention reduces the labor intensity of workers, and lowers the energy consumption.

An arch-breaking unit (100) comprising a connecting rod (110) actuated into a reciprocating movement by an actuating mechanism (112). The connecting rod (110) is connected along the axial direction to one or more connecting elements (120). The connecting elements (120) are pivotally connected to the connecting rod (110). Material-paddling arms (130) are connected to at least one cantilever end (121) of the connecting elements (120). The material-paddling arms (130) are arranged at an angle with the connecting rod (120). When the connecting rod (120) is moving in the axial direction, under the effect of an arching resistance, the cantilever ends (121) of the connecting elements (120) connected to the material-paddling arms (130) generate an angular displacement relative to where the connecting elements (120) and the connecting rod (110) are pivotally connected, thus regulating an arch-breaking resistance exerted on the material-paddling arms (130). The arch-breaking unit increases the freedom of movement of the material-paddling arms, reduces the rate of wear, and extends service life. Also disclosed is a material chamber (300) equipped with the arch-breaking unit (100).

The invention discloses a special high-performance polyvinyl chloride composite material for a cable. The composite material comprises the following raw materials: polyvinyl chloride, nitrile rubber, acrylonitrile-butadiene-styrene copolymer, trimethylol-propane trimethacrylate, 2,5-diphenyl-1,3,4-oxadiazole, kaolin, magnesium hydroxide, nanometer calcium carbonate, organic montmorillonite, graphite nanosheets, cerium carbonate, tribasic lead sulfate, bisphenol A diglycidyl ether, maleic acid monoester of lanthanum, cerium citrate, glycerol, glyzinc, dibutyltin dilaurate, xylitol, a lubricant, a plasticizer and a flame retardant, wherein the flame retardant is composed of ammonium heptamolybdate, hydrotalcite, zinc borate, bisphenol A bis(diphenylphosphate), silicone powder and alpha-zirconium phosphate. The special high-performance polyvinyl chloride composite material for the cable in the invention has the advantages of excellent heat resistance, good flame retardant performance, high strength, shock resistance and long service life.

The invention discloses a preparation method of a high-temperature and high-density water-based drilling fluid filtrate reducer composition, which belongs to the technical field of oilfield chemical agents, and is characterized in that the filtrate reducer composition is formed by combining a low-molecular-weight linear polymer and temperature-sensitive polymer particle microspheres, the preparation method of the low-molecular-weight linear polymer comprises the following steps: reacting an acrylamide hydrophilic monomer, a sulfonic acid group-containing temperature-resistant monomer, a rigid hydrophobic monomer, a cationic monomer, an initiator I and a polymerization inhibitor under a deoxidizing condition, washing a reaction product, drying and crushing to obtain the low-molecular-weight linear polymer. The preparation method of the temperature-sensitive polymer particle microspheres comprises the following steps: dissolving a temperature-sensitive monomer, a cationic monomer, a dispersing agent, a cross-linking agent and an initiator II in a mixed solution of deionized water and polyethylene glycol, reacting under a deoxidizing condition, and washing and drying a reaction product to obtain the polymer particle microspheres. The method is mainly used for synthesizing the high-temperature high-density water-based drilling fluid filtrate reducer composition.

The invention discloses a method for preparing a cation ester-based type soap-free emulsion polymer. According to the method, a cation type and an ester-based monomer are adopted as raw materials, a soap-free emulsion polymerization method is implemented, meanwhile, a pH value adjusting agent is adopted to control the pH value of a reaction environment within 8-8.5, a soap-free cation hydrophilicmonomer, a soap-free ester-based hydrophobic monomer and an initiator a are enabled to react to synthesize a soap-free polymer, and the soap-free polymer is further reacted with other raw materials tosynthesize a polymer emulsion. The preparation method has the advantages of being rapid in polymerization speed, small in reaction step, small in environment pollution and mild in reaction condition,the synthesized product is good in permeation resistance, good in peeling effect and excellent in waterproof effect and weather resistance, no expensive emulsifier is added in the synthesis process,and thus the production cost is also greatly reduced.

The invention discloses a mounting base for a robot. The mounting base comprises a base body with a disc structure, wherein the a mounting plate is connected with the center of the top surface of thebase body; three notches which are distributed in an array are formed in the bottom surface of the base body, swing rods are rotationally connected with the side surfaces of the notches respectively,the bottoms of the ends, located on the inner sides of the notches, of the swing rods are connected with rollers respectively, the tops, far away from the rollers, of the swing rods are provided withsliding grooves respectively, and sliding blocks are movably connected in the sliding grooves; oil cylinders located above the sliding blocks are arranged on the top surface of the base body, the piston rod ends of the oil cylinders penetrate through the top wall of the base body to be connected with the tops of the sliding blocks, and the ends, located on the outer sides of the notches, of the swing rods are connected with fixing assemblies respectively; and vacuum air pumps are arranged on one side of the top surface of the base body. The mounting base is reasonable in structure and convenient to use, the movement and positioning of the mounting base are facilitated, the mounting base can adapt to different ground surfaces due to the fact the different fixing modes are adopted, the stability of the mounting base is enhanced, and the robot can be kept stable during work.

The invention discloses a stirring kettle for preparing tetrabromobisphenol A, and relates to the technical field of stirring kettles. The stirring kettle comprises a stirring kettle body, a cover plate installed at the top of the stirring kettle body and a discharging mechanism installed at the bottom of the stirring kettle body, a plurality of feeding pipes are installed on the cover plate, a lifting mechanism is fixed to the top of the cover plate, a transmission mechanism is rotatably mounted at the lifting end of the lifting mechanism, one side of the transmission mechanism is in transmission connection with a driving mechanism, and the bottom end of the transmission mechanism penetrates through the inner wall of the bottom of the cover plate and is in transmission connection with a stirring shaft; a plurality of groups of stirring mechanisms which are distributed at equal intervals are mounted on the circumferential outer wall of the stirring shaft, and three stirring mechanisms form one group and are distributed circumferentially. The motion resistance between the stirring pipe and the reaction liquid can be increased, so that the rotating speed of the stirring shaft can be rapidly reduced, the transmission resistance is reduced when the motor is restarted to carry out anticlockwise driving work of the stirring shaft, and the motor is protected.

The invention relates to sports equipment. The sports equipment comprises a running platform, a flywheel, a friction type resistance device, an eddy current type resistance device and a front end frame body. The running platform includes a front roller, a rear roller and an annular running belt with which the two rollers are sleeved in an annular mode, a user can walk, jog or run on the running belt, and the motion causes the running belt to revolve around in cycles; the flywheel is fixedly connected with the front roller; the friction type resistance device is arranged near the flywheel and can be manually controlled by the user so as to change the revolving resistance of the flywheel and the front roller; the eddy current type resistance device is arranged near the flywheel and can be manually controlled by the user so as to change the revolving resistance of the flywheel and the front roller; the front end frame body is fixed on the front end of the running platform and is provided with at least one part to be held by the user. The sports equipment has two kinds of use modes, the first movement can be conducted in the first use mode, the second movement can be conducted in the second use mode, and in the two types of movement, the user can easily adjust the motion resistance to the required size.

The invention relates to a low-residue salt-tolerant fracturing fluid preparation method, and belongs to the technical field of fracturing fluid preparation. The preparation method comprises: mixing dimethylallylamine, chloroacetic acid and a sodium hydroxide solution to obtain a light yellow viscous liquid, introducing chlorine gas into the light yellow viscous liquid, carrying out heating distillation, adding anhydrous ethanol, cationic hydroxyethyl cellulose, river sand and an encapsulation gel breaker, and carrying out a stirring reaction to obtain the low-residue salt-resistant fracturingfluid. According to the present invention, the amphoteric cellulose ether in the fracturing fluid can effectively weaken and prevent the free water molecules in the aqueous fracturing fluid from hydration on the surface of the fracturing fluid particles and the pigment so as to improve the hydration dispersibility of the guar gum, completely break the gel and reduce the residue; the used guar gumcan improve the static viscosity of the aqueous fracturing fluid by rapidly hydrating with the water molecules through hydrogen bonding; and a large number of the cationic groups have good repellencyto the metal cation, such that the fracturing fluid has good salt-tolerant stability and has broad application prospects.

The invention discloses a polyvinyl chloride cable material resistant to heat and shock. The polyvinyl chloride cable material resistant to heat and shock is prepared from polyvinyl chloride, polyurethane, bisphenol-A polycarbonate, poly (tetramethylene succinate), di (2-ethylbutanoic acid) triuret gylcol ester, 2-ethylhexyl epoxystearate, montmorillonite, ammonium heptamolybdate, kaolin, aluminum hydroxide, magnesium hydroxide whisker, antioxidant, 1-azyl-4-methyl piperazine, tri methylol propane tri methacrylate, bisferrocene-base acetylene and a heat stabilizer. The heat stabilizer is prepared through mixing of rhenium complex, cerous carbonate, tribasic lead sulfate, bisphenol A diglycidyl ether, epoxy butyl stearate, lanthanum stearate, glyzinc, aceticacid,2,2',2''-[(octylstannylidyne)tris(thio)]tris-,triisooctylester, mannitol and 2,5-diphenyl-1,3,4-oxadiazole. The polyvinyl chloride cable material has high strength, heat resistance and shock resistance, is resistant to bending and torsion, and has a long service life.