11results about How to "Reduce drag" patented technology

This utility model discloses a horizontal slide table for an electric vibration test bench, applied in the field of electric vibration test bench technology. The key technical features are: it includes a lower vibration table and an upper vibration table fixedly connected to the lower vibration table; horizontal grooves are formed along the horizontal direction on both the upper and lower vibration tables; a horizontal slide table is slidably connected within the horizontal grooves; a first abutment plate and a second abutment plate are fixedly connected to the bottom of the horizontal slide table on both sides along the sliding direction; a plurality of abutment support shafts for abutting and supporting the first and second abutment plates are evenly and alternately rotatably connected to both sides of the horizontal groove along the sliding direction; and lubrication components for lubricating both ends of the abutment support shafts are provided within the horizontal grooves. The technical advantages are: simple structure and reduced friction.

This invention provides a variable-parameter drag-reducing device for a cylindrical body with a perforated cover, comprising a cylinder and a perforated cover. The perforated cover is fitted over the outer layer of the cylinder, and the perforated cover and the cylinder are aligned along the same centerline. The perforated cover completely encloses the cylinder. The perforated cover includes an outer cover and an inner cover. The outer cover can rotate relative to the inner cover around the centerline. Both the outer and inner covers have multiple through holes. When the outer cover rotates relative to the inner cover around the centerline, the overall porosity of the perforated cover can be adjusted. The length of the separation zone at the rear of the device is significantly increased, and the vortex shedding suppression effect is significant, resulting in increased pressure on the leeward side of the cylinder and reduced drag. Simultaneously, a significant vibration reduction effect is achieved. This invention further explores the influence of parameters such as the size of the perforated cover and changes in porosity on the overall drag-reduction effect, providing guidance for the design of perforated covers.

The application provides a cable positioning and locking device for building electromechanical installation and cable transmission, and belongs to the technical field of building electromechanical installation. The technical scheme is that the device comprises a mounting plate, a control device is arranged on the front side of the outer surface of the mounting plate, and a clamping structure is arranged at one end of the control device. The application has the beneficial effects that the clamping structure and the control device cooperate to smoothly separate two cleaning rings, thereby facilitating the placement of the cable. By closing the two cleaning rings, good supporting effect can be achieved when the cable is being dragged. The cleaning ring and the guide overheating alarm structure can reduce the abrasion of the cable and avoid damage caused by cable breakage. The device cooperates with the clamping structure and the control device to facilitate the placement of the cable and achieve the locking effect of the cable, thereby ensuring the stability of the cable installation.

The application relates to the field of 3D printing, in particular to a clutching and feeding mechanism for continuous fiber composite 3D printing. The feeding pipe is fixed on a shell through a joint, the tail end of the feeding pipe is connected with a feeding path formed by a feeding groove of a pressing feeding wheel and a feeding groove of a driving feeding wheel, the lower end of the feeding groove is connected with a discharging path at the lower end of the shell, and the shell is fixed on a motor connecting plate; the pressing feeding wheel is driven by the driving feeding wheel through gear meshing, the driving feeding wheel is fixed on a driving feeding shaft, the driving feeding shaft is driven to rotate by a transmission wheel fixed thereon, the transmission wheel is in transmission connection with a driving wheel through gears, the driving wheel is fixed on a stepping motor, and the stepping motor is fixed on the motor connecting plate; the two ends of the driving feeding shaft are sleeved in bearing inner rings, and bearing outer rings are sleeved with the motor connecting plate and the shell respectively; the swing angle of a rudder arm of a rudder can be controlled through the rudder, different feeding modes can be switched, and the fiber tension can be controlled.

The invention discloses an agricultural unmanned aerial vehicle path planning method based on a rasterized map and related equipment. The method comprises the following steps: acquiring boundary information of a farmland area to be operated, and performing digital rasterization processing on the farmland area to generate a raster map; performing area division on the farmland area based on the grid map to form a main operation area and turning-around areas located at the two ends of the main operation area; and receiving a starting point and a starting advancing direction specified by a user, generating a bow-shaped reciprocating main operation path covering the main operation area in the main operation area by taking the starting point and the starting advancing direction as path generation constraints, and generating a bow-shaped reciprocating operation path covering the space range of the U-turn area in the space range of the U-turn area. The problems that an existing full-coverage path planning algorithm mainly pursues that a path does not repeatedly sweep the whole area, but the general design cannot meet the special working condition of an agricultural unmanned aerial vehicle in the ploughing operation can be solved.

The application discloses a photovoltaic module and relates to the technical field of photovoltaic modules. The photovoltaic module comprises a cover plate, a glue film, a cell array, a lower glue film and a back plate. The cell array comprises at least one parallel group arranged along a first direction, each parallel group comprises at least two cell strings in parallel, each cell string comprises a plurality of cell pieces arranged along a second direction and connected in series, the back surface of the corresponding cell pieces in the first direction in each parallel group is provided with a plurality of sub bus bars, the plurality of sub bus bars are connected with the conductive wires of the same conductive type of the cell pieces, one conductive wire is connected with one sub bus bar, adjacent conductive wires are connected with different sub bus bars, and the width of the sub bus bar is less than or equal to 5 mm. The embodiment can effectively reduce the pulling force of the sub bus bar on the conductive wire when the sub bus bar is cold contracted, and reduce the probability of problems such as virtual welding, welding separation, cell piece warping and the like between the conductive wire and the grid line of the cell piece.

This utility model discloses an electric greenhouse film winding device, including a first winding support assembly and a second winding support assembly. The second winding support assembly includes a lower fixed mounting base, a U-shaped column fixed on the lower fixed mounting base with its opening facing away from the supporting arch frame, a strip groove opened in the U-shaped column in the longitudinal direction, a rack fixed in the U-shaped column in the longitudinal direction, a support shaft passing through the strip groove, a gear sleeved on the support shaft and meshing with the rack, a motor mounting plate slidably disposed on the side of the U-shaped column, a winding reduction motor fixed on the motor mounting plate and connected to the support shaft, a second traveling support roller and a third traveling support roller disposed on the inner side of the motor mounting plate, a first rolling bearing respectively sleeved on the second traveling support roller and the third traveling support roller, and a traveling wheel disposed on the first rolling bearing. The traveling wheel is placed inside the U-shaped column and rolls in the longitudinal direction.

This invention discloses a multi-hub motor Euler-Lagrange torque dynamic vector distribution system and its control method. The system treats the four hub motors of a distributed drive electric vehicle as a multi-hub motor electromechanical system. The torque distribution system of the multi-hub motor electromechanical system includes an integrated Euler-Lagrange torque controller and a driving assistance system. The method includes: pre-processing modeling of the four hub motors; pre-setting the Euler-Lagrange torque distribution control law; sampling the state variables of the multi-hub motor electromechanical system; determining the desired equilibrium point of the multi-hub motor electromechanical system; calculating the injection of dynamic interconnection coefficients and injection of friction damping coefficients; outputting the optimal given torque by the Euler-Lagrange torque distribution controller; and coordinating the modulation controller and the multi-half-bridge arm group driver to drive each hub motor. This invention can effectively adapt to various complex road conditions and improve the handling stability of distributed drive electric vehicles.

The utility model belongs to the technical field of stirrers, and particularly relates to a carbon steel surface spraying stainless steel stirrer which comprises a main shaft, an upper fixing piece, a lower fixing piece and a smashing piece are installed on the lower side of the main shaft, the upper fixing piece comprises a first optical axis fixing seat, the first optical axis fixing seat is connected with a sleeve, and a pawl is arranged in an installation groove formed in the side face of the sleeve. A paddle stirrer is rotatably mounted on the outer side of the sleeve and comprises a sleeve, a ratchet groove is formed in the inner wall of the sleeve and meshed with a pawl in a one-way mode, stirring blades are mounted on the outer side of the sleeve, the smashing part comprises a second optical axis fixing base, and smashing teeth are formed on the side face of the second optical axis fixing base. When the main shaft rotates forwards, the paddle stirrer is driven by the ratchet mechanism to rotate and stir materials; when the materials are caked and agglomerated at the final stage of concentration, the main shaft rotates reversely and does not generate power transmission with the paddle type stirrer, the paddle type stirrer and the agglomerated materials are prevented from expanding, deforming or breaking, meanwhile, the agglomerated materials are gradually crushed in the rotating process of the crushing part, and the stirring production efficiency is improved.

The application discloses a double-cone DNA chain-shaped magnetic micro-robot structure and a driving method. The micro-robot comprises a chain-shaped main body extending along a central axis, the chain-shaped main body is composed of two spiral main chains and a transverse connection sequence, the transverse connection sequence connects the two spiral main chains into a DNA chain-shaped structure, and an envelope circumscribing the micro-robot main body structure is double-cone-shaped. A magnetic functional layer and a biocompatible layer are sputtered on the outer surface of the micro-robot in sequence. The magnetic functional layer is magnetized to form a fixed magnetization direction with a preset misalignment angle with the central axis, so that the micro-robot can realize spiral propulsion under the action of an externally applied uniform rotating magnetic field. The propulsion direction can be switched by changing the rotating axis angle of the rotating magnetic field, so that the tail part can be used as the head part for propulsion in the return process, and the whole turning operation is avoided. The structure takes into account the drag reduction and attitude stability, and is suitable for micro-fluidic control and biomedical scenes.

This invention relates to the field of temperature-controlled clothing technology, solving the problem in existing technologies where the lack of an effective linkage control mechanism between thermoelectric elements and cooling fans affects the overall cooling effect. It provides a protective suit with temperature regulation function and its temperature control method. The protective suit includes: a garment body comprising an inner layer facing the body and an outer layer away from the body; a semiconductor refrigeration component disposed on the garment body; a power module electrically connected to and supplying power to the semiconductor refrigeration component; a cooling fan disposed on the outer layer of the garment body and electrically connected to the power module; and a control module for controlling the start / stop and power adjustment of the semiconductor refrigeration component and the cooling fan to achieve an adjustable cooling effect on the body.