42results about How to "High shear yield stress" patented technology

The invention relates to a water-based magnetorheological polishing solution for optical manufacture, which is formed by the following volume components, water-based remixed carrier liquid 25%-75% and additive component 25%-75%, wherein the additive component is dispensed by the following volume percentage, carbonyl iron powder 80%-90%, nanometer iron powder 4%-10% and polishing powder 4%-10%, the water-based remixed carrier liquid which is measured according to volume percentage comprises deionized water 85%-90%, dispersing agent 3%-5%, wetting agent 2%-5% and thixotropic agent 3%-5%, the method for preparing comprises the following steps: mixing deionized water and thixotropic agent, stirring in indoor temperature for 1-2 hours, and adding dispersing agent, stirring in indoor temperature for 0.5-1 hour, and then adding wetting agent, stirring in indoor temperature for 0.5-1 hour, getting water-based remixed carrier liquid, mixing additive component and water-based remixed carrier liquid, adding into a ball-milling tank, adding into a steel ball according to mass ratio which is 1:10, grinding for 3-5 hours in the speed which is 20-30r / m, separating out a steel ball, and getting products. The polishing solution of the invention has the advantages of excellent stability, high rheological property, excellent oxidation resistance property and simple and environmental-friendly preparation technology.

The present invention is an electromagnetic extruded magneto-rheological and shape-memory alloy friction composite brake, which includes a brake shaft, a brake housing and a brake base, and a brake disc is also arranged in the brake housing; the brake disc and the left An armature disc is respectively arranged between the housing and the right housing, and a squeeze disc is arranged between the armature disc and the brake disc, and magnetorheological fluid is filled between the squeeze disc and the brake disc; There are several accommodating grooves, in which a hollow liquid guide rod and a shape memory alloy spring are arranged, and a friction block is arranged at the outer end of the accommodating groove; a liquid guiding rod is arranged between the coil groove and the accommodating groove There are several through holes on the side wall of the hollow liquid guide rod, and the heat conduction liquid is filled in the liquid guide hole, the storage tank and the hollow liquid guide rod. The invention can effectively improve the braking torque of the brake, ensure the braking stability and improve the braking effect.

The invention discloses a magneto-rheological fluid pilot pressure reducing valve, which comprises a main valve body, a main valve core, a spring, a valve seat, a damping disc, a bobbin frame, a coil and a valve sleeve; the main valve includes two left and right cavities Body, the left chamber communicates with the oil outlet, the right chamber communicates with the oil inlet, and the valve port is normally open; the left chamber communicates with the front chamber of the magnetorheological pilot valve through the damping hole, and the main valve core and the inner surface of the main valve form a moving pair; In the magneto-rheological pilot valve, the liquid flow channel between the winding frame, the positioning disc and the damping disc forms an axial and radial damping gap. When the coil of the magneto-rheological pilot valve is energized, the magnetic force line passes through the damping gap vertically, and the magnetic flow Under the action of the magnetic field, the viscosity of variable fluid increases rapidly; by adjusting the magnitude of the current, the pressure difference at both ends of the damping gap can be changed; the magnetorheological pilot valve has no moving spool, simple structure, and high control precision.

The invention relates to a magnetorheological-effect-based straight screwdriver with the positioning and anti-slipping functions. The magnetorheological-effect-based straight screwdriver with the positioning and anti-slipping functions is used for preventing the phenomenon that a bolt head is damaged due to the fact that relative slippage occurs between a screwdriver head and a bolt occurs when an operator overexert himself / herself to tighten or loosen the bolt through a screwdriver. The magnetorheological-effect-based straight screwdriver with the positioning and anti-slipping functions is composed of a shell, magnetorheological fluid, an isolation ring, an electromagnetic coil, a piston, a sealing ring, a piston rod, a cross bar, connecting rods, clamping rods, a straight screwdriver head, a size compensator, a sliding block, a button and a sliding groove. When the straight screwdriver head is stretched into a bolt head, a user slides the sliding block upwards to make the clamping rods clamp the bolt head tightly and then presses the button to power on the straight screwdriver, relative slippage will not be produced by the screwdriver head, the bolt head and the clamping rods when the screwdriver is rotated, and finally the bolt is tightened or loosened on the condition of guaranteeing that the bolt head is not scratched; the user presses the button again to power off the straight screwdriver and slides the sliding block downwards to make the clamping rods to loosen the bolt head, and then the whole bolt tightening or loosening process is completed.

The invention relates to a magnetorheological-effect-based hexagonal screwdriver with the positioning and anti-slipping functions. The magnetorheological-effect-based hexagonal screwdriver with the positioning and anti-slipping functions is used for preventing the phenomenon that a bolt head is damaged due to the fact that relative slippage occurs between a screwdriver head and a bolt occurs when an operator overexert himself / herself to tighten or loosen the bolt through a screwdriver. The magnetorheological-effect-based hexagonal screwdriver with the positioning and anti-slipping functions is composed of a shell, magnetorheological fluid, an isolation ring, an electromagnetic coil, a piston, a sealing ring, a piston rod, a cross bar, connecting rods, clamping rods, a hexagonal screwdriver head, a size compensator, a sliding block, a button and a sliding groove. When the hexagonal screwdriver head is stretched into a bolt head, a user slides the sliding block upwards to make the clamping rods clamp the bolt head tightly and then presses the button to power on the hexagonal screwdriver, relative slippage will not be produced by the screwdriver head, the bolt head and the clamping rods when the screwdriver is rotated, and finally the bolt is tightened or loosened on the condition of guaranteeing that the bolt head is not scratched; the user presses the button again to power off the hexagonal screwdriver and slides the sliding block downwards to make the clamping rods to loosen the bolt head, and then the whole bolt tightening or loosening process is completed.

The invention provides a magnetorheological polishing adhesive and a preparation method thereof. The magnetorheological polishing adhesive is composed of carbonyl iron powder (30%-70%), polishing powder (2%-7%), gel (0.5%-5%), gas-phase silicon dioxide (0.2%-1.5%), deionized water (10%-35%), and glycerol (15%-40%). The preparation method comprises the following steps: (1) weighing the carbonyl iron powder, the polishing powder, the gas-phase silicon dioxide, the gel, the deionized water and the glycerol according to a formula of the magnetorheological polishing adhesive; (2) putting the glycerol and the deionized water into a container, performing stirring to obtain a glycerol aqueous solution, performing heating, dissolving the gel into the glycerol aqueous solution under stirring to forma mixed solution; (3) adding the weighed carbonyl iron powder, the weighed gas-phase silicon dioxide, and the weighed polishing powder to the mixed solution in sequence, and performing stirring to obtain a magnetorheological polishing adhesive; and (4) putting the formed magnetorheological polishing adhesive into a refrigerating chamber, performing refrigeration, and taking the adhesive out whenusing. The magnetorheological polishing adhesive provided by the invention has the simple preparation method, higher stability and a higher shear yield stress, and can meet performance requirements ofprocessing.

The invention belongs to the technical field of functional composite materials and relates to a preparation technology of a material with a shear thinning electromagnetorheological property. Comparedwith other single component materials, the prepared composite material of a core-shell structure by taking ferriferrous oxide as a core and molybdenum disulfide as a shell and modifying molybdenum disulfide with titanium dioxide has obviously excellent electrorheological and magnetorheological properties. The preparation method is simple in preparation process and convenient to operate; titanium dioxide and molybdenum disulfide have excellent electrorheological properties and can generate a relatively high shear yield stress under the action of an electric field, and meanwhile, magnetic ferriferrous oxide has a relatively high magnetizing saturated degree and can generate a relatively high shear yield stress under the action of a magnetic field. Molybdenum disulfide has an excellent lubricating property, so that the material is low in cost, clean and non-toxic and relatively short in reaction time, and has wide application value.

The invention relates to an outer hexagonal screwdriver which is based on the magnetorheological effect and has the positioning function and the anti-slippage function. The screwdriver is used for preventing the phenomenon that when a screwdriver is used for tightening or loosening a bolt, a screwdriver blade and a bolt head have relative slippage because exerted force is too large, and the bolt head is damage is prevented. The device is composed of a shell, magnetorheological liquid, an isolating ring, an electromagnetic ring, a piston, a sealing ring, a piston rod, a transverse rod, a connecting rod, a clamping rod, an outer hexagonal screwdriver blade, a volume compensator, a slider, a button and a sliding groove. After the outer hexagonal screwdriver blade extends into the bolt head, the slider is made to slide upwards, the clamping rod is made to tightly clamp the bolt head, then, the button is pressed down and the screwdriver is powered on, no relative slippage happens to the screwdriver blade, the bolt head and the clamping rod when the screwdriver is screwed, finally, it is guaranteed that the bolt is tightened or loosened under the situation that the bolt head is not scratched, next, the button is pressed down again and the screwdriver is powered off, the slider is made to slide downwards so that the clamping rod can loosen the bolt head, and the whole process that the bolt is tightened or loosened is completed.