6results about How to "Control liquidity" patented technology

The invention relates to the technical field of road construction, and provides a road maintenance crack repairing and flattening device which comprises a base, an inclined tamping assembly is arranged in the middle of the bottom end of the base and comprises a fixing plate fixedly arranged at the bottom end of the base, and a first driving chain wheel and two first rotating shafts are arranged on one side of the fixing plate; first connecting rods are arranged on the outer surfaces of the first rotating shafts, second connecting rods are arranged at the bottom end of the base, a third rotating shaft is arranged at the lower ends of the two first connecting rods, a fourth rotating shaft is arranged at the lower ends of the two second connecting rods, and mounting plates are arranged at one ends of the third rotating shaft and the fourth rotating shaft; arc-shaped plates capable of moving in an opening and closing mode are symmetrically arranged at the lower end of the mounting plate. According to the crack repairing and flattening device for road maintenance, the V-shaped structure capable of being adjusted to be opened and closed is matched with the inclined tamping assembly, multidirectional compaction and rapid surface leveling of a crack repairing material are achieved, and the compactness of a repairing layer and the flatness of a road surface are improved.

This invention relates to the field of oilfield chemistry, and discloses a fracturing fluid drag-reducing agent composition, its preparation method, and its application. The drag-reducing agent composition comprises cis-15-tetracosenoic acid and a polymer; the polymer comprises polymer A and polymer B, polymer A comprising structural unit A from formula (1), and polymer B comprising structural unit B from formula (2); formula (1); formula (2); wherein R1 is substituted or unsubstituted C 12 -C 20 R1 is an alkyl group; R2 is an unsubstituted C1-C4 alkyl group; X is selected from positive integers from 6 to 14; R3 is H or a C1-C3 alkyl group. The drag-reducing agent composition can maintain drag-reducing performance and improve oil recovery over a wide temperature range.

The application discloses a kind of preparation method for preparing sheet low-sodium alpha-alumina using secondary aluminum ash.The method uses high-temperature sintering method to prepare alumina, and the performance of the product is improved by pickling or water washing.The obtained sheet low-sodium alpha-alumina has the advantages of perfect crystal form development, high purity, low sodium content, high alpha-alumina content, and micro-nano level particle size.The application does not add any morphology inducer, and eliminates the pollution problem caused by ammonia gas generated due to incomplete denitrification of aluminum ash, realizes the removal of harmful elements in aluminum ash, and achieves the purposes of harmless treatment and resource utilization.Also, the application overcomes the shortcomings of high cost, low efficiency, low purity and serious pollution in the prior art for preparing sheet alumina.The prepared sheet low-sodium alpha-alumina has great application potential in high-end automobile polishing, gem processing, high-precision microelectronic processing, cosmetics, functional coating and ceramic toughening, etc.

This invention relates to the field of testing methods, specifically to a tensile testing method for the bonding strength of brazed diamond composite coatings. The method involves preparing tensile specimens of the brazed diamond composite coating, sequentially performing tensile tests on each group of specimens using a tensile testing machine, recording the fracture location data and the maximum tensile load at fracture for each group of specimens, and making judgments based on the recorded data. This method solves the technical problem of quantitatively evaluating high-hardness, high-bonding-strength coatings, and provides an effective solution for evaluating the bonding performance of high-performance coatings such as diamond composite coatings.

The invention relates to the technical field of waterproof mortar, in particular to shrinkage-free high-ductility waterproof repair mortar and a preparation method thereof. The shrinkage-free high-ductility waterproof repair mortar comprises a high-ductility functional system and a controllable early strength system, and the high-ductility functional system comprises modified sisal fibers, anhydrous calcium sulfate, an ethylene-vinyl acetate copolymer, an amorphous active silicon material, a defoaming agent, lithium carbonate, cellulose ether, a thixotropic agent, L-tartaric acid and sodium gluconate. The controllable early strength system comprises ordinary Portland cement, rapid hardening type sulphoaluminate cement, 20-40-mesh river sand and 40-70-mesh river sand. The high-ductility functional system and the controllable early-strength system form the high-ductility shrinkage-free waterproof repair mortar through a specific preparation mode, the controllable early-strength system can rapidly repair a damaged structure, effective bonding can be achieved in adverse environments such as damp and vertical faces, the system is kept cracked and not damaged when being damaged by external force, and leakage can be effectively stopped.

This utility model relates to the field of drilling gates, and more particularly to a combined drilling gate, including a gate installation channel. A support platform is fixedly installed at the lower end of the gate installation channel, and a fixed platform is fixedly installed at the upper end of the gate installation channel. Fixed brackets are fixedly installed on both sides of the support platform and the fixed platform. A liftable gate body is installed on the fixed platform and the gate installation channel. A motor box is fixedly installed at the upper end of the gate body. A drive motor is installed inside the motor box. A gate arm is fixedly connected to the output end of the drive motor. A rotating plate is fixedly connected to the lower end of the gate arm. This utility model, by setting up the gate body, drive motor, gate arm, and rotating plate, allows the opening and closing of the entire gate installation channel to be controlled by moving the gate body up and down, thereby controlling the overall height of the gate body and the rotating plate, and further controlling the flow rate of the drilling fluid. After the drive motor starts, it drives the gate arm to rotate, thereby driving the rotating plate to rotate, controlling the flow and flow rate of the drilling fluid, achieving dual control.