3650 results about "Front edge" patented technology

A main body for use as an interchangeable component with a modular platform for a gutter guard system is disclosed herein. The main body includes a front edge, a rear edge, a top surface, a bottom surface, and a plurality of water management features. The rear edge is generally parallel to and spaced apart from the front edge. The top surface and bottom surface are disposed between the front edge and the rear edge, and the top surface and bottom surface are positioned opposite to each other. In one embodiment, the water management features include a plurality of apertures that form passages though the top and bottom surfaces of the main body.

Disclosed herein are gutter guard systems arranged to efficiently manage the flow of rainwater across the system and prevent the matting of debris onto the system. In one exemplary embodiment, a gutter guard system includes a main body and a screen covering the main body. The main body includes a front receiver, a rear receiver, and a water management section positioned between and connecting the front and rear receivers. The screen spans the water management section and is secured to the main body by engagement on one end with the front receiver and on the opposite end with the rear receivers. When the gutter guard system is installed in a rain gutter, the front receiver engages with the front edge of the rain gutter, and the rear receiver engages with the rear portion of the rain gutter.

The invention provides a turbine blade design method which comprises the following steps: S1, dividing a turbine blade profile into four sections at equal intervals along the radial direction according to the size of a turbine, and calculating section parameters of a middle-section turbine blade profile; s2, connecting the four sections by adopting a third-order Bezier curve, defining a blade front edge angle theta as an included angle between the Bezier curve and a blade front edge radial inlet angle alpha, and generating a three-dimensional blade model by changing the inclination angle theta of each section; s3, performing optimization to obtain an optimized theta parameter; and S4, according to the optimized theta parameter, fitting each section blade profile by using a third-order Bezier curve to generate a turbine stator and rotor three-dimensional model. According to the method, the machine learning method is applied to design of the turbine blade, the three-order Bezier curve, the CFD numerical simulation method and the particle swarm optimization are utilized, the blade parameters are given, the geometric parameters can be quickly and accurately predicted, the calculated amount is reduced, the cost is reduced, the design efficiency is improved, and the quality of the designed blade is guaranteed.

A power tool includes a housing, a motor mounted within the housing and including a stator with an outer diameter and a rotor having a shaft configured to rotate about an axis relative to the stator. The power tool also includes a gear assembly operably coupled to the motor and including a ring gear fixed relative to the housing and planet gears meshed with the ring gear. A drive assembly is operably coupled to the gear assembly to receive torque from the shaft through the gear assembly. The power tool also includes a rear bearing rotatably supporting a rearward portion of the shaft and a forward bearing rotatably supporting a forward portion of the shaft. A distance measured between a front edge of the rear bearing and a rear edge of the forward bearing is less than the outer diameter of the stator.

An absorbent article having a front edge intended to be positioned at a front side of a person and a rear edge intended to be positioned at a rear side of a person, said absorbent article comprising a liquid pervious topsheet, a liquid impervious backsheet, and an absorbent material between said topsheet and said backsheet, wherein at least a first spacer element is included between said topsheet and said backsheet, wherein the first spacer element has a top side facing the topsheet, a bottom side facing the backsheet, and a number of lateral sides between the top and the bottom side, and wherein the absorbent material extends along at least two opposite lateral sides of the first spacer element; said first spacer element being configured to guide liquid to the absorbent material upon wetting of the absorbent article.

The invention discloses an automobile seat automatic adjusting sliding rail and an automobile seat thereof, and belongs to the technical field of automobile parts. Comprising a static sliding rail, and the static sliding rail comprises a static sliding rail fixing bottom plate, a static sliding rail front side wall and a static sliding rail rear side wall; a movable sliding rail front edge folding groove and a movable sliding rail rear edge folding groove are formed in the movable sliding rail, and the bottoms of the left end and the right end of the movable sliding rail are each provided with a pair of Z-direction gap eliminating idler wheels; the seat basin connecting plate is connected to the upper part of the movable sliding rail; the screw rod is arranged in the static slide rail cavity; the movable sliding rail automatic displacement driving mechanism is matched with the seat basin connecting plate, the movable sliding rail and the screw rod; the device is characterized in that front clearance eliminating mechanisms are arranged at the left end and the right end of the building wall corresponding to the front edge folding groove of the movable sliding rail respectively, and rear clearance eliminating mechanisms are arranged at the left end and the right end of the building wall corresponding to the rear edge folding groove of the movable sliding rail respectively; a pair of movable sliding rail guide mechanisms is arranged on the downward side of the middle of the movable sliding rail. The device has the advantages of simplifying the overall structure and facilitating manufacturing and assembling; the all-around excellent anti-backlash effect is embodied; the service life is long.

A bipedal robot includes an upper region includes a head and neck assembly having a neck portion and a head portion coupled to the neck portion. Said head portion includes: a frontal shell having a rear edge, a rear shell having a frontal edge, and an illumination assembly. The illumination assembly is configured to illuminate a region that: (i) extends between a rear edge of the frontal shell and an extent of the frontal edge of the rear shell, (ii) is positioned adjacent to the extent of the rear edge of the frontal shell, and (iii) is positioned adjacent to the extent of the frontal edge of the rear shell.

A system and method for manufacturing a wind turbine blade. The wind turbine blade includes a shell structure defining a leading edge and a trailing edge. The wind turbine blade also includes a longitudinal edge extension arranged to extend at least partially along the leading edge or at least partially along the trailing edge to modify an aerodynamic characteristic of the wind turbine blade. The longitudinal edge extension includes a center section and a peripheral section comprising attachment means, and the shell structure is arranged to engage with the attachment means to secure the longitudinal edge extension.

A gutter cover system has a reverse-curve cover and clips, fastened to fascia, that secure the back edge of the cover. The front of the cover has an S shape with a convex upper part and a concave lower part. The lower part clips inside the upper front edge of the gutter. The cover is corrugated with fore-aft extending ridges and grooves. The corrugations create small triangular openings for water to enter the gutter while preventing small leaves and evergreen needles from entering the gutter.

The invention relates to a novel weir flow bottom hole combined fishway with diversion piers and a vortex recognition method of the novel weir flow bottom hole combined fishway, and belongs to the field of hydraulic engineering and ecological engineering. On the basis of a traditional weir flow bottom hole combined fishway, a traditional thin-walled weir is bent in the horizontal direction by improving the form of the weir, then the length of the overflow front edge is increased, and a diversion pier is additionally arranged at an outlet of a bottom hole. The combination of the weir and the bottom hole can effectively change the proportion of overflow on the weir and overflow at the bottom hole, and can effectively improve the water flow state in the fishway pool chamber. Besides, on the basis of the idea that the vorticity is larger than deformation, the vorticity is further decomposed into a rotating part and a non-rotating part through an omega vortex recognition method, and then vortexes in the fishway are effectively recognized. Physical model tests and numerical simulation prove that the device can effectively improve the water flow environment in the fishway pool chamber, and can be popularized and applied to actual engineering.

The utility model relates to an air bag cushion and a mattress using the same. When an existing air bag cushion is assembled, the splicing precision of adjacent air bag strips is poor. The air bag cushion comprises a cushion body, the cushion body comprises air bag strips which are arranged side by side in the front-back direction of the cushion body, the front edges and the rear edges of the adjacent air bag strips are provided with front connecting pieces with front holes and rear connecting pieces with rear holes respectively, and when the front connecting pieces and the rear connecting pieces of the adjacent air bag strips are fixedly connected in an overlapped mode, the front connecting pieces and the rear connecting pieces of the adjacent air bag strips are connected in an overlapped mode. And the front holes are vertically aligned with the corresponding rear holes, so that the adjacent air bag strips are arranged in parallel at equal intervals. The front connecting piece and the rear connecting piece are provided with the front hole and the rear hole respectively, the front hole and the rear hole are vertically aligned, and it is ensured that the front connecting piece and the rear connecting piece are accurately stacked and fixedly connected, it is ensured that the adjacent air bag strips are parallel to each other, it is also ensured that the distance between the adjacent air bag strips meets the use requirement, and comfortable support is provided for a user; the use experience is improved.

An embodiment vehicle body structure includes a floor panel, a dash crossmember mounted at a front edge of the floor panel, and a dash panel connected to a top edge of the dash crossmember, wherein the dash crossmember includes a cross portion extending in a width direction of a vehicle and a front portion protruding from the cross portion toward a front of the vehicle, wherein the front portion includes a horizontal wall protruding horizontally from the cross portion toward the front of the vehicle, an upper flange extending vertically upward from the horizontal wall, and a lower flange extending vertically downward from the horizontal wall, and wherein the horizontal wall, the upper flange, and the lower flange each extend in the width direction of the vehicle.

The invention relates to the field of the centrifugal fan industry, in particular to an impeller with multi-element coupling bionic blades and a centrifugal fan, the impeller comprises a front disc and a rear disc, an exhaust inlet is formed in the middle of the front disc, a plurality of blades are arranged on the rear disc in a surrounding array mode, and the blades comprise long blades and short blades which are evenly distributed at intervals; the long blades and the short blades are all metal plate type single-arc multi-element coupling bionic blades. According to the impeller with the multi-element coupling bionic blades and the centrifugal fan, according to the principle of a bionic flow control technology, the front edge of the long blade adopts a streamline structure characteristic of simulating the outer side edge of a shark tail fin, and the tail edge of the blade adopts a typical arc tooth structure characteristic of simulating the feather front edge of a tenon wing; the common problems of small flow, low pressure, low efficiency and large noise of a centrifugal fan in the prior art are solved.

A helicopter blade waving and shimmy decoupling position measuring method based on fiber bragg grating sensors comprises the following steps that a plurality of fiber bragg grating sensors are evenly pasted on the upper surface and the lower surface of a to-be-measured section of a helicopter blade in parallel from the front edge to the rear edge of the blade; flapping and shimmy bending moments are loaded on the blades respectively, and strain values corresponding to the flapping and shimmy bending moments are obtained through measurement; according to the position of the sensor and strain measurement data thereof, adopting a Kriging interpolation method to carry out interpolation on point positions with the same spacing, and obtaining an estimated value of a corresponding spatial position; establishing shimmy / flapping and flapping / shimmy decoupling coefficient evaluation functions; global traversal is carried out on the interpolation result, evaluation function values are calculated and sorted, and finally a decoupling position is determined.

The improved high-performance fire pump comprises a centrifugal impeller, a volute, a rotating shaft and a motor, the centrifugal impeller comprises a rear disc, a front disc and blades, and the inner side of the rear disc is provided with a first plane; the impeller is characterized in that the blade comprises a main blade part and a small blade part which are integrally formed, the main blade part is provided with a main blade front edge, the rear edge of the small blade part is repeated with the main blade front edge, and an included angle a is formed between the top edge of the small blade part and the first plane; the included angles a between at least more than 50% of the top edges in the plurality of small blade parts and the first plane are not equal, and the included angles a are equal to 1-15 degrees. Through the design of the small blade part, turbulent flow or backflow and secondary flow at the blade inlet in the impeller cavity can be reduced, the anti-cavitation performance of the fire pump can be improved, and therefore the hydraulic performance and efficiency of the fire pump can be improved.

A wind turbine blade (20) that extends longitudinally in a spanwise direction between a root end (24) and a tip end (26), and in a chordwise direction between a leading edge (28) and a trailing edge (30), is disclosed. The wind turbine blade (20) includes a first opposing half-shell portion (34) and a second opposing half-shell portion (36) which together define an interior (38) the wind turbine blade (20), and at least one shear web (52) that extends between the first opposing half-shell portion (34) and the second opposing half-shell portion (36). The wind turbine blade (20) further includes at least one vibration damping device (60, 90, 122, 124, 126, 128, 132, 204, 224, 230, 250) for reducing noise emission from the wind turbine blade (20). The at least one vibration damping device (60, 90, 122, 124, 126, 128, 132, 204, 224, 230, 250) includes at least one resonating member (62, 138, 202, 232, 260) that extends from a surface of the wind turbine blade (20) to a distal end (70, 96, 156, 186, 206, 234, 262) that is configured to oscillate to dissipate vibrational energy away from the surface of the wind turbine blade (20).

The invention discloses a low-water-head water turbine with a flow guide wing bionic blade, which is provided with a variable pitch system for adjusting an included angle between a runner blade and an incoming flow direction, and a deflection control system for adjusting an included angle between a guide vane arranged on a bulb body and the incoming flow direction, the water flow impact acting force on the blades can be changed through the water flow impact acting force, the water flow impact acting force on the blades can be changed through the water flow impact acting force, and the water flow impact acting force on the blades can be changed through the water flow impact acting force. In addition, the blade of the runner of the hydraulic turbine set is the blade with the wave-shaped front edge, and a section protruding outwards is arranged in a pipeline for containing the bulb body and the runner, so that the water energy utilization rate of the hydraulic turbine set is further increased. The blade adopts a sine curve-shaped waveform front edge, and the structure simulates a convex shape on a fin-shaped limb of an underwater organism, so that the resistance in water is reduced, and the water energy utilization rate of a water turbine set is increased.

The cab comprises a driving compartment body and a vehicle door, the driving compartment body comprises a front portion and side portions located on the two sides of the front portion, wheel openings are formed in the side portions and used for being matched with front wheels, the wheel openings and the front wheels are concentrically arranged, the vehicle door is connected to the side portions and can be opened relative to the side portions, and the vehicle door comprises a front edge and a rear edge which are arranged in the X direction; in the X direction, the front edge and the rear edge of the vehicle door are located on the two sides of the center point of the wheel opening respectively, in the X direction, the distance between the rear edge and the center point of the wheel opening is L1, the distance between the front edge and the rear edge is L2, and the ratio a of L1 to L2 is larger than or equal to 0.65 and smaller than or equal to 0.95. According to the cab, the man-machine design of the cab can be optimized, the driving comfort and getting-on and getting-off convenience of a driver are improved, furthermore, the driving length requirement and / or the cab wind resistance design requirement can be considered while the man-machine design of the cab is optimized, and the streamline cab with low wind resistance is formed.

The invention relates to the field of welding facilities, in particular to a bearing seat welding device which comprises a table top, a centering column is fixedly mounted in the middle of the upper end of the table top, a supporting ring is coaxially and fixedly mounted on the outer surface of the centering column, and push tables are arranged on the two sides of the centering column and elastically connected with the table top. A positioning column is fixedly installed in the middle of the upper end of the pushing table, positioning lugs are obliquely installed on the front edge and the rear edge of the upper end of the pushing table, the two positioning lugs are symmetrical with the axis of the positioning column as the symmetric center, a welding part is installed on the rear portion of the upper end of the table top, and the axis of the centering column and the axis of the positioning column are located on the same plane. The welding convenience is improved, the bearing seat can make close contact with the mounting lugs, follow-up welding forming is effectively facilitated, and meanwhile the welding efficiency is improved.

The utility model provides a blade for a centrifugal fan, a double-suction centrifugal impeller applying the blade and the fan. The blade comprises a suction surface wall, a pressure surface wall, a front edge, a rear edge, a convex air inlet part and a concave air outlet part, the suction surface wall and the pressure surface wall are arranged back to back and extend in the length direction of the blade firstly and then extend between the front edge and the rear edge; the protruding air inlet part is formed in the mode that the front edge part of the blade protrudes towards one side of the suction surface wall, the concave air outlet part is formed in the mode that the rear edge part of the blade protrudes towards one side of the pressure surface wall, and the protruding air inlet part and the concave air outlet part are connected in the direction from the front edge to the rear edge. In the length direction of the blade, the convex air inlet part is of a structure with high middle and two low sides, and the concave air outlet part is of a structure with low middle and two high sides; in the direction from the front edge to the rear edge, the middle height of the convex air inlet part is in a decreasing trend; and in the direction from the rear edge to the front edge, the middle height of the sunken air outlet part is in a decreasing trend.

An inlet assembly of a nacelle includes an inlet cowl that has a leading edge, an outer side that extends from the leading edge to an outer aft edge, and an inner side that extends from the leading edge to an inner aft edge. An exterior surface of the inlet cowl is seamless along an entire length of the outer side from the leading edge to the outer aft edge. The inlet cowl includes a lipskin that has a metallic coating. The metallic coating defines the exterior surface of the inlet cowl along the leading edge and the entire length of the outer side.

The invention provides a novel ceramic matrix composite material and metal material combined adjustable turbine blade, and belongs to the technical field of aerospace, the novel ceramic matrix composite material and metal material combined adjustable turbine blade specifically comprises a metal upper edge plate and a metal lower edge plate; the ceramic matrix composite material front edge assembly is fixedly installed between the metal upper edge plate and the metal lower edge plate, and the ceramic matrix composite material front edge assembly serves as a front edge area of the blade; the adjustable metal blade body is rotationally mounted between the metal upper edge plate and the metal lower edge plate; the rear end of the blade body part of the ceramic matrix composite material front edge assembly is in butt joint with the front end of the adjustable metal blade body to form a complete turbine blade body structure. Through the treatment scheme, the problem that in the prior art, cooling of the front edge of the metal blade consumes a large amount of cold air is solved, and the service life of the adjustable turbine blade is prolonged.

An accessory comb (30) of a hair trimmer is provided for use with an electric hair trimmer (10) having a trimmer blade set (18) including a fixed blade (22) and a moving blade (20) that reciprocates laterally relative to the fixed blade. The accessory comb includes a comb base (32) having a rear edge (34) in operative relationship with the stationary blade, and an opposing front edge (36), the comb base defining a centerline extending between the rear edge and the front edge. A plurality of comb teeth (40) is provided, each comb tooth having a tooth base (42) associated with the leading edge and a tip (44) opposite the tooth base. The teeth are arranged on the accessory comb such that there is a non-uniform spacing between adjacent teeth with respect to the centerline such that the spacing of the teeth is symmetrical about both sides of the centerline.

A bipedal robot includes an upper region includes a head and neck assembly having a neck portion and a head portion coupled to the neck portion. Said head portion includes: a frontal shell having a rear edge, a rear shell having a frontal edge, and an illumination assembly. The illumination assembly is configured to illuminate a region that: (i) extends between a rear edge of the frontal shell and an extent of the frontal edge of the rear shell, (ii) is positioned adjacent to the extent of the rear edge of the frontal shell, and (iii) is positioned adjacent to the extent of the frontal edge of the rear shell.

The invention relates to the technical field of wharf construction processing, in particular to a construction method for a front-edge double-pile bearing beam and a berthing component, according to a support building method, hoops are installed on front-edge double-row PHC piles to serve as anchoring points, cantilever beams are welded to the front edge sides of the hoops to serve as structures for supporting the berthing component, and the whole installation mode is simple, convenient and reliable; the double-layer hoops are adopted on the front-edge double-row PHC piles to serve as supports of different layers of structures, so that installation stability is guaranteed, later adjustment can be facilitated, and particularly, the installation levelness of the cantilever beam can be adjusted conveniently. In addition, the cross beams at the upper ends of the front-edge double-row PHC piles are connected through the supporting I-shaped steel oblique beams, so that the connecting stability between the front-edge double-row PHC piles and the rear-row double piles can be guaranteed, and the front-edge double-row PHC piles and the rear-row double piles are matched in different directions. The installation efficiency can be effectively improved by prefabricating the berthing component.

The invention relates to a stator component (20) comprising a platform (22), a first blade (24), a second blade (26) and a vane (28) having a leading edge (30) and a trailing edge (32), the vane extending opposite an upper side (124) of the first blade and an underside (126) of the second blade, the leading edge comprising a leading point (34) located on the platform, a tangent of the leading edge at the leading point extending between the first blade and a radial front plane (Pa), the trailing edge includes a trailing point (36) located on the platform, a tangent of the trailing edge at the trailing point extending between the second blade and a radial aft plane (Pf).

The invention describes a testing apparatus (1) for use in a wind turbine rotor blade manufacturing facility, comprising a pulling means (10) adapted to pull an adherent strip (3T) from a surface of a rotor blade (2); a positioning arrangement (11) configured to maintain a predetermined pull angle (x) between the adherent strip (3T) and the surface of the rotor blade (2) during a test procedure; and a support frame (12) for holding the pulling means (10) and positioning arrangement (11), which support frame comprises a clamping arrangement (14) adapted to clamp about the leading edge (2LE) of the rotor blade (2). The invention further describes a method of performing a test procedure on a wind turbine rotor blade (2) using the inventive testing apparatus (1).

Various implementations include a low-drag smart tether system for measuring fluid speed and direction. The system includes a sleeve, a pressure sensor, and a tether. The sleeve has a longitudinal axis and an airfoil shaped cross-section as viewed in a plane perpendicular to the longitudinal axis. The sleeve has a leading edge. The sleeve defines a tether opening extending parallel to the longitudinal axis. The pressure sensor is disposed along a surface of the sleeve. The pressure sensor is configured to measure the pressure exerted on the pressure sensor by air moving over the surface of the sleeve. The tether extends through the tether opening defined by the sleeve. The tether has a tether longitudinal axis. The tether opening is positioned such that fluid flowing around the sleeve causes the sleeve to rotate about the tether longitudinal axis.

The invention relates to a cooperative control method for smooth pit-passing braking of a vehicle. The cooperative control method comprises the following steps that geometric data of a road surface pit and initial time data of predicted contact between a target wheel and the front edge of the pit are obtained through a preview sensing system; when the geometric data and the initial time data meet a preset triggering condition, triggering a suspension position control mode of the target wheel: acquiring target height data of a suspension, and generating a movement track of an active suspension of the target wheel from the current height data to the target height data; controlling an active suspension actuator to track the motion trail; and responding to the condition that the active suspension actuator reaches the preset supporting state. According to the method, traditional passive impact bearing is converted into active impact avoiding and buffering, so that collision energy between the wheels and the pothole edge is greatly absorbed, vertical bumping and pitching shaking of a vehicle body under the condition that a single wheel passes through a pit are effectively restrained, and unprecedented stable and comfortable braking experience is provided for passengers.

The present invention discloses a glass handwriting board, comprising a shooting fill light bar assembly, a handwriting glass assembly, a control box assembly and a shooting rod assembly, wherein the shooting fill light bar assembly is arranged on the front edge of the handwriting glass assembly, the control box assembly is arranged at the middle position of the bottom of the handwriting glass assembly, and the rear side of the control box assembly is connected to the shooting rod assembly. The present invention integrates the shooting rod assembly with the handwriting glass assembly through the control box assembly, so that the space occupied by the device is small; at the same time, by arranging the shooting rod assembly behind the handwriting glass assembly, the shooting rod assembly can shoot the writing content on the handwriting glass assembly, and the teacher in front of the handwriting glass assembly can also be photographed at the same time, which can strengthen the interaction between teachers and students, thereby effectively improving the teaching quality.