1117 results about "Frictional resistance" patented technology

The invention discloses a gap-controllable retainer and a frictional resistance measuring method thereof, belongs to the technical field of mechanical equipment manufacturing, and solves the problem that an existing device can only test a retainer with a fixed gap and cannot simulate the influence of dynamic gap change on bearing performance. The retainer capable of controlling the gap comprises a retainer body capable of adjusting the gap between the retainer body and a rolling body, a retainer moving assembly and a gap adjusting part. The gap adjusting part comprises an adjusting motor, an eccentric wheel and a motor fixing frame. According to the retainer capable of controlling the gap, the gap between the retainer and a rolling body can be dynamically adjusted, the retainer can be matched with different types of ball-disc testing machines (rotary type and linear contact type) for friction resistance measurement, the gap between the rolling body and a pocket of the retainer can be flexibly adjusted by adjusting the motor and the eccentric wheel, and the friction resistance of the rolling body is measured. And therefore, the retainer main body can meet the retaining and limiting requirements of different working conditions and different types of bearings, and the performance, the service life and the reliability of the bearings are remarkably improved.

The invention relates to the technical field of welding, and discloses a plasma welding device for aluminum conductor cable production, which comprises a welding table and a welding gun, one end of the welding table is provided with a movable first clamping jaw, and the clamping end of the first clamping jaw is provided with a clamping seat; a second clamping jaw and a servo motor used for driving the second clamping jaw to rotate are arranged at the other end of the welding table, two slidable cleaning bases and an adjusting assembly used for adjusting the positions of the two cleaning bases are arranged on the welding table, and steel wire brush blocks are slidably connected to the two cleaning bases; a first abutting wedge block is arranged on one steel wire brush block. Polishing of the oxide layer on the cable body and cutting of the cable tie can be automatically completed, manual operation is not needed, time and labor are saved, convenience and rapidness are achieved, the welding efficiency is greatly improved, the wiring terminal is inserted into the cable body in a twisting mode, and therefore friction resistance is reduced, and the inserting process is smoother.

The invention relates to a high-rotating-speed multi-stage centrifugal pump supported by an air film. Efficient liquid conveying is achieved through unique design. A motor in the driving mechanism is powered on, power is stably transmitted to a pump shaft through a coupler, and a multi-stage impeller is driven to rotate at a high speed. Liquid flows in from the water inlet in the bottom of the pump body, obtains speed energy under the centrifugal force of the impeller and is converted into pressure energy through the multi-stage guide vanes, and efficient conveying is achieved. Gas is stored in a gas chamber in a stator of the air bearing and forms an air film through a multi-stage shrinkage nozzle to support a pump shaft, friction resistance is reduced, and high rotating speed is adapted. The rubidium magnet in the rotor shaft sleeve interacts with the magnetic fluid cavity, so that sealing is enhanced, and adjustment is assisted. The mechanical seal and the oil seal prevent liquid leakage and protect the air bearing. An overflow cavity and an overflow groove adjust pressure in the pump, a water inlet filter screen intercepts impurities, and a pull rod stabilizing structure is reinforced. The centrifugal pump effectively solves the problem of a traditional centrifugal pump at a high rotating speed and has the advantages of high efficiency, stability, long service life and the like.

The invention discloses a biomechanical self-ligating bracket, and belongs to the field of biomechanical self-ligating brackets, the biomechanical self-ligating bracket comprises an arch-shaped base, the upper end of the arch-shaped base is fixedly connected with a base, the upper end of the base is connected with a bracket wing assembly, the upper end of the base is connected with a limiting assembly, and the interior of the bracket wing assembly is connected with an anti-opening assembly. According to the key points of the technical scheme, by arranging a limiting assembly, when the arch wire slides in the designed direction (forward sliding), namely, the arch wire slides from back to front, a sliding block keeps in contact with the lower portion of the arch wire under the elastic force of a spring, the thrust of the arch wire is decomposed into normal force and tangential force, the friction resistance of the arch wire is small, and when the arch wire slides in the reverse direction, the sliding block is dragged by the friction force to slide along a sliding groove; the spring is stretched, the clamping block is finally wedged into the clamping groove, and the friction resistance of the arch wire is increased, so that the sliding block forms a self-locking effect, and the situation that teeth are difficult to move in a preset direction due to reverse sliding of the arch wire is prevented.

The invention provides a pipe jacking construction pushing frictional resistance prediction method considering on-way loss of a drag reducer, and relates to the technical field of constructional engineering. The method comprises the following steps: judging a pipe-soil slurry contact state; calculating the pipe-soil contact pressure; calculating the pipe-soil frictional resistance according to the pipe-soil contact pressure and the contact width; obtaining the initial thickness of the slurry sleeve and calculating the pressure drop ratio per unit length of slurry; according to the pressure drop ratio and the initial thickness of the slurry sleeve, the thickness of the slurry sleeve changed along the way in the pushing process is calculated; calculating pipe slurry sliding frictional resistance according to the thickness of the slurry sleeve; according to the pipe soil frictional resistance, the pipe slurry sliding frictional resistance, the pipeline radius and the contact width, the pushing frictional resistance is calculated; and if the predicted pushing frictional resistance exceeds an expected value, the grouting pressure is corrected. According to the method, on-way changes of drag reducer pressure and drag reducer thickness in pipe jacking construction are considered, a unit length pipe joint three-dimensional frictional resistance calculation formula considering longitudinal drag reduction attenuation is established, and compared with actual measurement results, the error of the method is only 3% and is far lower than that of a traditional means.

The invention relates to a piston type rotary supporting device and a control method, and belongs to the technical field of coal mine robot automation. The device comprises a rear end cover, a transmission body piston, a cylinder barrel, an output connecting disc, a front flange and a ball. The rear end cover is matched with a special-shaped hole of the transmission body piston through a special-shaped guide shaft, and axial sliding and circumferential rotation stopping of the piston are achieved. A spiral groove of the transmission body piston is meshed with a multi-head thread of the output connecting disc, so that linear motion is converted into rotary motion; the cylinder barrel and the front and rear end covers form a sealed hydraulic cavity, and the piston is driven by hydraulic oil to reciprocate. According to the control method, positive and negative rotation and speed adjustment of the output connecting disc are achieved by adjusting hydraulic flow. According to the scheme, the high bearing capacity is achieved through hydraulic driving, the speed reducing mechanism is simplified through the spiral transmission structure, the friction resistance is reduced through the balls and the roller paths, and the robot joint is suitable for the severe environment of an underground coal mine and meets the 0-360-degree precise rotation requirement.

A bracket includes a main body, an elastic positioning and locking plate, a load-bearing part, and multiple reinforcement ribs. The front and rear sides of the main body are provided with a first hook and a second hook respectively. The first hook is provided with an operating hole, the elastic positioning and locking plate is connected to the operating hole and protruded with a locking part to form a locking, and provided with an operating part corresponding to the operating hole for a release purpose. The load-bearing part is integrally formed and bent from a lower edge of the main body to support a server chassis, and each reinforcement rib is integrally formed on the load-bearing part and the main body to reduce frictional resistance.

The invention relates to the technical field of wire installation, and particularly provides a strain clamp of a power transmission line, which comprises a shell and two wedge blocks. A wedge-shaped through groove is formed in the shell in the length direction of the shell. A baffle is arranged on the side edge of a groove opening of the through groove, a force storage barrel is arranged on the baffle, and the force storage barrel is connected with a tensioning rope. The two wedge blocks are oppositely arranged in the through groove, and a power transmission line is clamped between the two wedge blocks; a rotating shaft is arranged on the wedge block opposite to the baffle and is connected with the opposite tensioning rope; and the rotating shaft is in frictional contact with the power transmission line and rotates when the power transmission line slides relative to the wedge block, so that the tensioning rope is wound around the rotating shaft. According to the scheme, by arranging the force storage cylinder, the rotating shaft and the tensioning rope, when the power transmission line slides relative to the wedge block, the rotating shaft is driven to rotate through the friction effect, so that the tensioning rope is wound around the rotating shaft, the friction resistance among the shell, the wedge block and the power transmission line is improved, the clamping effect on the power transmission line is improved, and the falling risk of the power transmission line is reduced.

The invention relates to the technical field of cold extrusion forming, and discloses cold extrusion forming equipment for gear production and machining. The extrusion seat is arranged above the operation table; the linear telescopic mechanism is fixed at the top of the operation table, and the telescopic end is fixed with the extrusion seat; and the forming mechanism is arranged at the top of the operation table and comprises an installation base detachably installed at the top of the operation table, a movable sleeve arranged at the top of the installation base, a forming mold formed by splicing a plurality of mold splicing single bodies and a contraction driving assembly. According to the forming mechanism provided by the invention, by adopting a splicing forming mold and a linkage structure, the mold monomers are driven to be unfolded outwards during demolding to realize complete separation of a gear and the inner wall of a mold cavity, so that the demolding friction resistance is greatly reduced, and the surface of the mold is prevented from being scratched and abraded; the modular mold design supports single replacement, the maintenance cost is remarkably reduced, and the overall service life of the mold is prolonged.

The application discloses a nuclear main pump mechanical seal structure and relates to the technical field of nuclear main pump sealing.The application comprises a main shaft and a shell and further comprises a dynamic ring, which is sleeved on the main shaft and rotates synchronously with the main shaft, a gap is left between the circumferential side of the dynamic ring and the shell, one end of the dynamic ring is a contact surface, a lubricating space is arranged on the contact surface, a static ring is sealingly and slidingly installed on the shell, the dynamic ring is coaxial with the static ring and the main shaft penetrates through the static ring, and a gap is left between the inner side of the static ring and the main shaft.The application can effectively smear the lubricating liquid between the dynamic ring and the static ring when the nuclear main pump is running, the main shaft is continuously rotating and the main shaft rotation has a certain amplitude process, the frictional resistance between the dynamic ring and the static ring is reduced, the use effect of the dynamic ring and the static ring is improved, the abrasion degree between the dynamic ring and the static ring is reduced, the dynamic ring and the static ring are avoided from being frequently replaced, and the maintenance cost is reduced.

A sealing mechanism (1) that seals an annular gap (4) between a housing (2) and a rotation shaft (3) comprises a metal seal ring (10). A first shaft-sliding surface (15), a labyrinth-seal forming surface (16), and a second shaft-sliding surface (17) are formed on a circular inner peripheral surface (11) of the seal ring (10). The first and second shaft-sliding surfaces (15, 17) are matte surfaces having a prescribed surface roughness. A labyrinth seal is formed between the labyrinth-seal forming surface (16) and a circular outer peripheral surface (3a) of the rotation shaft (3). Making the first and second shaft-sliding surfaces (15, 17) matte surfaces makes it possible to reduce the frictional resistance with the rotation shaft (3) and to suppress wear and heat generation in the first and second shaft-sliding surfaces (15, 17). Furthermore, a sealing mechanism capable of preventing oil leakage in both axial directions can be obtained.

The invention provides an anti-toppling and anti-collision type AGV carrying robot for a power switch cabinet, and relates to the technical field of AGV carrying robots, the anti-toppling and anti-collision type AGV carrying robot comprises a carrying vehicle body and a lifting pallet installed on the carrying vehicle body and used for bearing the power switch cabinet, and anti-toppling mechanisms are arranged at the two side ends of the carrying vehicle body; according to the anti-roll transport vehicle, the anti-roll rods symmetrically distributed on the two sides of the rotating shaft are driven to rapidly rotate through meshing transmission of the straight groove racks and the second gears on the rotating shaft, and when the anti-roll rods are unfolded to be parallel to the transport vehicle body, the anti-roll rods are driven to rapidly rotate; the balls made of wear-resistant steel balls embedded in the ends of the anti-roll bar are in contact with the ground, so that the risk of center-of-gravity shift can be reduced by enlarging the contact area between the robot and the ground, the frictional resistance between the anti-roll bar and the ground can be reduced by means of the rolling characteristics of the balls, and additional hindrance to movement of the robot is avoided; and finally, the anti-rollover capacity for coping with different working conditions in the carrying process is remarkably improved.

The invention relates to the technical field of drainage pipeline detection, and discloses an endoscopic detection device for a drainage pipeline, which comprises a detection assembly and a detection assembly, the detection assembly comprises a walking vehicle, the walking vehicle is provided with a detection head, and the tail part of the walking vehicle is connected with a wire; the positioning assembly is arranged on the wire and comprises a positioning piece, the positioning piece comprises a guide wheel located on the outer side of the wire, a fixing column is fixed in the guide wheel, a connecting plate is rotationally connected to the outer side of the fixing column, a connecting rod is fixed to the top of the connecting plate, and a winding wheel is arranged on the top of the connecting rod. The beneficial effects of the invention are that through the arrangement of the positioning assembly, the cable can be kept in a stable bending state and does not rub with the inner wall of the pipeline, thereby avoiding signal interruption or equipment short circuit caused by wear of an outer sheath of the cable, conductor fracture and cracking of an insulating layer, eliminating the influence of frictional resistance on the connection point of the detection head and the walking mechanism, and improving the detection precision. Detection interruption caused by disconnection of the two is avoided, and the detection process is continuous and stable.

The invention provides an impervious wall joint pipe drawing monitoring device based on frictional resistance monitoring and a use method, the impervious wall joint pipe drawing monitoring device comprises a plurality of joint pipes which are lowered to the end part of a groove section of an impervious wall, and a detection device is fixedly arranged at the end part of the lowest joint pipe; the frictional resistance detection device comprises a control device, a side wall friction cylinder and a plurality of side resistance sensors, and a tilt angle sensor is further arranged in the detection device and used for monitoring the tilt angle of the connector pipe in real time and guaranteeing the lowering precision of the connector pipe. The method comprises the following steps: establishing a relationship between the frictional resistance of the end part of a joint pipe and the concrete strength in a concrete diaphragm wall pouring process through an indoor test, calculating the stress condition of the concrete at the end part of the joint pipe in the concrete diaphragm wall pouring process by using a finite element method, and determining a relationship between the concrete critical strength and the pipe drawing critical frictional resistance; therefore, the pipe drawing time is guided according to the frictional resistance measured by the detection device.

The invention relates to the field of press machines, and discloses a press machine for mounting a motor bearing, which comprises a bearing mounting frame and a press machine body, the press body is arranged on the rear side of the upper surface of the bearing mounting frame; the auxiliary positioning mechanism is arranged on the upper surface of the bearing mounting frame, and the auxiliary positioning mechanism is used for fixing and limiting the motor rotating shaft before the bearing is mounted on the motor rotating shaft to be mounted and triggering the motor rotating shaft to rotate to smear the lubricating liquid at the same time. The absolute stability of the rotating shaft is ensured in the process of fixing and limiting the rotating shaft of the motor, and meanwhile, the pre-coated uniform lubricating layer can remarkably reduce the frictional resistance and heat generation when the bearing is pressed in, reduce the damage risk of a matching surface, ensure that the bearing can be stably and accurately pressed in a preset position, and improve the working efficiency. Therefore, high-efficiency, high-quality and low-damage bearing installation is realized.

The utility model relates to the technical field of filtering equipment, in particular to a vacuum sliding table structure of a filtering machine, which comprises a sliding table body, a vacuum chamber is arranged in the middle of the sliding table body, a filtering cavity and a discharge hole are arranged below the vacuum chamber, and a mounting area is arranged on the sliding table body. The installation areas are arranged on the left side and the right side of the vacuum chamber respectively, floating plates are arranged in the installation areas and connected to the sliding table body through elastic assemblies, sliding grooves are formed in the upper ends of the floating plates, and friction belts are arranged in the sliding grooves. The sliding table has the advantages that the floating plate is connected to the sliding table body through the elastic assembly, the sliding efficiency and smoothness of a sliding part are improved, friction resistance is reduced, the situation that a rubber belt and a friction belt are abraded and cannot be tightly attached, and the vacuum environment is damaged is avoided, the influence of external force on the sliding table can be buffered and dispersed to a certain degree, and the service life of the sliding table is prolonged. And the service life of equipment is prolonged.

A vessel for transporting cargo by water comprises one or more propulsion devices with at least one air-breathing engine from the one or more propulsion devices disposed entirely above a surface of the water in a high-speed mode of operation. The least one air-breathing engine is configured to bleed airflow into a fluid circuit. The fluid circuit routes the bleed airflow to one or more fluid outlets disposed entirely below the surface of the water in the high-speed mode of operation. At least some of the one or more fluid outlets release the bleed airflow in the high-speed mode of operation generate a boundary layer along at least a portion of a hull of the vessel to reduce a skin friction drag thereof.

The invention discloses a device and a method for detecting frictional resistance of a casing in a fixed casing. The device comprises a first pipe body, a second pipe body, a third pipe body, a fourth pipe body, a weighting pipe fitting, a fifth pipe body and a drill bit mechanism which are connected in sequence, the second pipe body and the third pipe body are rotationally connected through a first meshing rotating assembly driving the third pipe body to rotate in the circumferential direction. The third pipe body and the fourth pipe body are rotationally connected through a second meshing rotating assembly driving the fourth pipe body to rotate in the circumferential direction. The second pipe body and the third pipe body are each provided with a friction resistance detection assembly of the same structure, and the friction resistance detection assemblies are used for detecting the friction resistance between the casing and a shaft in the wall attaching advancing process. By means of the friction resistance detection assembly, friction resistance of different casing pipe tripping-in working conditions during casing fixing in the test casing can be simulated in the tripping-in process, the simulated working conditions better fit the actual situation, a decision basis is provided for later casing pipe safe tripping-in, an old well shaft can be cleaned, and later casing pipe safe tripping-in is guaranteed.

The invention relates to the technical field of bulk grain ship unloading, and discloses a special bulk grain ship unloader which comprises a main body, a discharging pipe is fixedly connected to the side wall of the main body, and a conical barrel is fixedly connected to the top of the discharging pipe. By means of the auxiliary assembly, materials can be actively guided to be away from the inner wall of the discharging pipe through a recess formed by a flexible layer, and the situation that the materials are accumulated near the inner wall of the discharging pipe under the action of centrifugal force when the auger rotates is reduced; the situation that in the vertical discharging process of materials, due to the fact that friction resistance between the materials and the inner wall of the discharging pipe is large or part of the materials are clamped due to the effect of centrifugal force, the materials are ground, sheared and pulverized in the discharging process is reduced, the discharging efficiency during discharging is improved, and meanwhile the integrity and quality of the materials are improved.

The high-temperature-resistant cable special for the crane crane is characterized by comprising three power line units, a ground line unit, a filling rope, a wrapping tape, an inner sheath, a steel wire braided reinforcing layer and an outer sheath, the silicone rubber material is adopted as the insulating material of the power line and is matched with the steel wire braided reinforcing layer with high braiding density, so that insulation ablation penetration can be effectively avoided at extremely high temperature, the frictional resistance between the insulating layers can be effectively reduced when the cable is bent and moved, cable bulging and conductor core breakage are avoided, and the service life of the cable is prolonged. The service life of the cable in a high-temperature environment can be effectively prolonged, and the problems of sheath ablation and core breakage are reduced.

The invention discloses a novel adhesive tape machine and a guide chute. Comprising a guide chute frame arranged corresponding to the sealing-tape machine; a plurality of guide rods are vertically arranged on the guide chute frame corresponding to the two sides of the sealing-tape machine; the lower section of each guide rod is sleeved with a contact baffle frame. An adjusting spring is arranged on the guide rod above each contact baffle frame in a sleeving manner; and each contact baffle frame is provided with a contact baffle. The contact surface of the contact baffle and the adhesive tape machine can automatically adjust the contact pressure according to the running state of the adhesive tape and the impact of materials, and the requirements for preventing the materials from overflowing and reducing the friction resistance are effectively met.

Provided is a sliding component capable of stably reducing the frictional resistance between sliding surfaces entailing eccentric rotation. A sliding component has a sliding surface relatively sliding with eccentric rotation. The sliding surface is provided with a dynamic pressure generation groove defined by side walls extending in a circumferential direction. At least one of the side walls is formed in a waveshape with amplitude in a radial direction.

The present disclosure relates to an anti-jamming ratchet-type tensioning device, comprising a base, a winding and unwinding mechanism with a ratchet wheel, and an operating mechanism. The operating mechanism controls locking or unlocking via a lever element, with an elastic check claw provided at the executing end of the lever element to prevent reverse rotation of the ratchet wheel. The key feature lies in the design of the lever element's pivot point as a movable structure. When the ratchet wheel rotates clockwise and pushes the check claw, the lever element can move upward with the thrust to avoid obstruction, reducing frictional resistance, effectively preventing jamming, and ensuring smooth and effortless webbing extraction.

The utility model provides a wire winding device and charging equipment, and relates to the technical field of wire winding and pulling. The wire winding device comprises a shell, a first abutting piece and a second abutting piece, the first abutting piece and the second abutting piece are arranged on the shell, a wire is wound in the shell and can stretch out or retract relative to the shell, the first abutting piece and the second abutting piece can be far away from each other or close to each other, and in the process that the wire is retracted into the shell, the first abutting piece and the second abutting piece can abut against each other. The first abutting piece and the second abutting piece abut against the two opposite sides of the wire correspondingly, friction resistance opposite to the movement direction of the wire is generated on the surface of the wire, and therefore the take-up speed of the wire is reduced. In the extending process of the wire rod, the first abutting piece moves away from the second abutting piece so that a gap can be formed between the wire rod and the first abutting piece and / or the second abutting piece, and the wire rod can be smoothly pulled.

The fastener dismounting and mounting device comprises a supporting assembly and a stretching assembly, the supporting assembly comprises a centering component and a supporting component which are connected with each other, the supporting component is arranged on the outer side of a nut in a sleeving mode, and the centering component is provided with a first molded surface; the stretching assembly is used for being connected with the stud and applying traction force to the stud, the stretching assembly is provided with a second molded surface, and the stretching assembly and the supporting assembly form molded surface fit through abutting of the first molded surface and the second molded surface. The supporting component is arranged on the outer side of the nut in a sleeving mode and abuts against the connecting rod lower cover, single-side supporting is provided for the stretching assembly connected with the stud, the stretching assembly can apply traction force to the stud conveniently, and disassembly and assembly of the nut are facilitated. The centering component connected with the supporting component and the stretching component form molded surface fit, so that the radial position of the supporting component is adjusted, a gap is formed between the supporting component and the nut, frictional resistance caused by contact between the supporting component and the nut is avoided, and the nut dismounting precision and smoothness are improved.

The invention discloses a prestress tension control method and system based on a multi-parameter coupling loss law, a medium and a processor, and relates to the technical field of prestress tension control. Common and specific parameters of a bridge and a tunnel are collected and preprocessed, and a scene-divided multi-parameter coupling loss law model is constructed; friction resistance, retraction, aging and environment loss rate are accurately quantified; determining a tension control force sequence in combination with an effective pre-stress target value, and constructing by adopting a hierarchical regulation and control strategy; and through post-construction effective prestress detection and deviation verification, parameter iteration and closed-loop management are realized. The problems that in the prior art, multi-parameter coupling loss quantization is insufficient, scene adaptability is deficient, and construction-detection closed loop fracture occurs are solved, the tensioning control precision is greatly improved, the method is adaptive to multiple scenes of bridges and tunnels, and the safety and stability of an engineering structure are guaranteed.

The utility model provides a wire winding device and charging equipment, and relates to the technical field of wire winding and pulling. The winding device comprises a shell, a first abutting part and a second abutting part, a wire is wound in the shell, and the first abutting part and the second abutting part movably abut against the two opposite sides of the wire respectively; in the process of withdrawing the wire rod, the first abutting part and the second abutting part abut against the two opposite sides of the wire rod respectively and provide frictional resistance for the wire rod. According to the wire winding device, the first abutting part and the second abutting part abut against the two sides of the wire rod when the wire rod is retracted into the shell, friction resistance is provided for the wire rod, and the speed reduction effect on the wire rod is achieved; and the first abutting part and the second abutting part can move, so that when the wire rod extends out of the shell, the wire rod can push the first abutting part or the second abutting part to move under the action of external force, and the wire rod is pulled out of the shell from multiple directions, so that the wire rod is pulled more smoothly when the wire rod extends out of the shell, and the flexibility is higher.

The invention discloses a system and method for prolonging the operation life of a motor based on fuzzy control, and the method comprises the steps: building a state space, an action space and a reward function, and defining an optimization target as an optimal lubrication period; a Q-learning algorithm is used, an optimal strategy is learned through interaction with the environment, and the lubrication period is adjusted; approaching a Q function value by using a deep Q network, and automatically extracting a fuzzy control rule and a membership function through a neural network; automatically learning a nonlinear relation between the temperature and the vibration difference value through a neural network, and adjusting a fuzzy rule and a membership function shape; and the lubrication period is dynamically adjusted according to the real-time state, and self-adaptive control is achieved. By acquiring and processing related information of a motor lubricating point, lubricating grease required by the motor during working is deduced, and the lubricating point is filled with the corresponding lubricating grease, so that precise lubrication of the motor is realized, frictional resistance is reduced, and the service life of the motor is prolonged.

The application discloses a solid droplet-based drag reduction ball preparation and testing method, and relates to the underwater drag reduction technical field.The preparation method comprises the following steps: performing decontamination treatment on the surface of a steel ball, configuring a PDMS solution and pouring the PDMS solution into a polytetrafluoroethylene mold with small holes with different curvature radii, performing vacuum degassing and solidification, and then peeling off to obtain solid droplet structures with different curvature radii, and bonding the solid droplet structures to the bottom of the steel ball.Through the regulation and control of the solid droplet curvature radius (2.5-10.8 mm) and the water entry speed, the high-speed camera technology is used to observe the change law of the sputtering crown formation, air entrainment and air cavity closure mode in the water entry process, the quantitative analysis of the underwater air cavity volume and the drag coefficient is combined, and the influence of the solid droplet curvature radius on the air cavity shape and the drag reduction performance is verified.The solid droplet structure optimizes the air film capture efficiency, significantly reduces the blunt body pressure difference resistance and the friction resistance, and the preparation process is simple, stable and suitable for the development of the underwater vehicle drag reduction technology.

The utility model relates to the technical field of hydraulic engineering, in particular to a water delivery tank for hydraulic engineering, which comprises a tank body, a fixing plate is fixedly mounted on one side, close to a water inlet end, of the tank body, a drainage plate is slidably mounted in the tank body, a rotating shaft is fixedly mounted at one end of the drainage plate, and a through hole is formed in the side wall of the fixing plate in a penetrating manner. One end of the rotating shaft is rotatably mounted in the bottom hole, the other end of the rotating shaft is rotatably mounted in the through hole, the first mounting plate is fixedly mounted on one side of a water outlet of the tank body, a plurality of water through holes are formed in the side wall of the first mounting plate in a penetrating manner, and a filter screen is fixedly mounted on one side of a water inlet of the tank body. The water delivery tank for the water conservancy project is provided with the tank body, the interior of the tank body is of a trapezoidal structure with the wide upper portion and the narrow lower portion, the stability of the tank body is improved, the tank body is made of stainless steel, the surface is smooth, friction resistance between water flow and the tank wall is reduced, the drainage plate is rotationally installed in the tank body, the flow direction and the flow speed of the water flow can be changed, and meanwhile water flow resistance is reduced.