150results about How to "Increase the radius of curvature" patented technology

The invention relates to a junction termination structure of a transverse high-pressure power semiconductor device, belonging to the technical field of semiconductor power devices. An N-type drift region at a curvature termination of the transverse high-pressure power semiconductor device is shortened in length to ensure that the N-type drift region is spaced with a P-well region by a certain displace, wherein the spaced part is replaced by a P-type substrate, which is equivalent that additional electric charges of the P-type substrate are introduced so that the peak value of an electric field at a pn junction formed the original P-well region and the N-type drift region is reduced, meanwhile, a new peak value of the electric field is introduced at a pn junction formed by the P-type substrate and the N-type drift region, the radius of curvature of the curvature terminal is increased, the excessive concentration of a power line is avoided, and the puncture voltage of the device is increased, wherein the surface of the N-type drift region also can be combined with a surface RESURF structure or an ultra-junction structure. The junction termination structure has the advantages of being capable of decreasing the width of the curvature terminal of the device, saving the layout area of the device and being compatible with a CMOS (Complementary Metal-Oxide-semiconductor Transistor) process, and can be used for manufacturing the transverse high-pressure power device with the advantages of excellent performance, high voltage, high speed and low conduction loss.

The invention belongs to the technical field of optical imaging and detecting and relates to a bilateral dislocation differential confocal element parameter measuring method. The method includes the steps that dislocation differential subtracting processing is conducted on the two sides of a confocal axial characteristic data set measured by the starting points and the ending points of all various size parameters including the curvature radius, the lens thickness, the refractive rate, the focal distance and the interval, and therefore the positioning precision of the starting points and the ending points of the size parameters is improved, and the measuring precision of optical elements of the curvature radius, the lens thickness, the refractive rate, the focal distance, the interval and the like is improved. According to the bilateral dislocation differential confocal element parameter measuring method, due to the fact that two sections of data, close to the position of the full width at half maximum and very sensitive to axial displacement, of a confocal characteristic curve are used for conducting the dislocation differential subtracting processing, the position, calculated by the data sections, of the extreme point of the confocal characteristic curve is more sensitive and more accurate than the position, calculated through an existing confocal characteristic curve top fitting method, of the extreme point of the confocal characteristic curve, according to the result of the bilateral dislocation differential confocal element parameter measuring method, under the condition that the confocal element parameter system structure is not changed, the axial focusing capability, the signal-to-noise ratio and the like of the system can be obviously improved.

The invention discloses a rotatable lifting device for construction engineering, which relates to the technical field of construction industry equipment and aims to solve the problem in the prior art that a dangerous section of a hydraulic rod is easily broken due to stress concentration during the transfer process of building materials; it includes a hydraulic Rods, connecting rods, support rods, pillars, rotating discs, chassis and clamping devices for clamping construction materials, and also include lifting locking mechanisms, including pulley assemblies, wire ropes, winches, lead screws and for The driving assembly that drives the screw to rotate. The screw is fixedly connected to the winch and is threaded through the axis of the pillar vertically, and the rotation center line of the winch is perpendicular to the axis of the pillar. Tight on the winch. By implementing the technical solution, the gravity of the building material is dispersed at each stress point of the pulley assembly, avoiding the problem that the dangerous section of the hydraulic rod is easily broken due to stress concentration, and improving the safety factor.

The invention discloses an embedded recoverable expansion anchor cable and a construction method thereof. The embedded recoverable expansion anchor cable comprises a grouting pipe, expansion unfolding arms, steel strand wires, a steel strand wire free sliding cabin, a fixing and bearing device, and a flexible telescopic sleeve, wherein the steel strand wire free sliding cabin is sleeved onto the upper part of the grouting pipe; the fixing and bearing device is arranged at the lower end of the grouting pipe; the expansion unfolding arms are uniformly distributed on the periphery of the grouting pipe; the upper ends of the expansion unfolding arms are fixed to the bottom of the steel strand wire free sliding cabin; the lower ends of the expansion unfolding arms are fixed to the top of the fixing and bearing device; the steel strand wire free sliding cabin can move in the axial direction with respect to the grouting pipe; the middle of each of the steel strand wires moves around the bottom of the fixing and bearing device; the two ends of each of the steel strand wires are respectively fixed onto the steel strand wire free sliding cabin and the two end parts of each of the steel strand wires respectively extend from the steel strand wire free sliding cabin; and the flexible telescopic sleeve is sleeved on the expansion unfolding arms and the steel strand wires. According to the embedded recoverable expansion anchor cable, the steel strand wires can be recovered and have higher bearing capacity.

The invention discloses transparent super-hydrophobic glass with anti-fog and dewdrop self-cleaning functions and a preparation method of the transparent super-hydrophobic glass. The preparation method comprises the steps of: performing high-temperature phase splitting treatment on sodium borosilicate glass to form an alkali-rich sodium-boron phase and a silicon-rich oxygen phase which are interpenetrated, then removing the alkali-rich sodium-boron phase through an acid etching process to reserve a high-silicon-content glass-phase porous three-dimensional network structure coating, and finallyreducing the surface energy through a fluorination process to obtain a transparent super-hydrophobic glass coating. The transparent super-hydrophobic glass with anti-fog and dewdrop self-cleaning functions and the preparation method of the transparent super-hydrophobic glass have the advantages of a simple process, easy operation, low requirements for equipment and low cost, and a new idea is provided for the preparation of transparent glass with a self-cleaning property.

A pump rotor is an inner rotor of an internal gear pump, the inner rotor having a tooth profile, wherein a half-tooth portion of the tooth profile is formed of three tooth-profile formation circles that are elliptical or true-circular. Two of the tooth-profile formation circles are a combination of a small tooth-profile formation circle and a large tooth-profile formation circle in which the small tooth-profile formation circle is inscribed and is entirely included. A portion of the small tooth-profile formation circle forms an addendum portion of the half-tooth portion. A portion of the large tooth-profile formation circle in which the small tooth-profile formation circle is inscribed and is entirely included forms an engagement portion of the half-tooth portion. A portion of another tooth-profile formation circle that circumscribes the large tooth-profile formation circle forms a dedendum portion of the half-tooth portion.

A parking brake is based on a roller external planetary bi-directional overrun brake. An external ring replaces external planetary block and heel. Wedges replace rollers. A fork controls wedges between the external and internal rings to go forward or backward or to stop. The both sides of the external ring are machined to be projected outwards at the portions engaged with the front and rear caps, of which the corresponding portions are machined to be recess for assembling with tight fit and being welded with low carbon steel electrodes with little annealed areas and hardness of HRC60 at its inner surface.

The invention provides a compensation light source system and a dynamic image detecting device for a train operation fault. The compensation light source system comprises a laser generator (50) provided with an optical fiber (51) provided with an optical output end, and a beam shaping component. The beam shaping component comprises a cylindrical planoconvex lens (80) and a cylindrical planoconcave lens (90). The cylindrical planoconvex lens (80) and the optical output end of the optical fiber (51) are arranged oppositely, the cylindrical planoconcave lens (90) and the cylindrical planoconvex lens (80) are arranged sequentially along the transmission direction of laser beams transmitted by the optical output end of the optical fiber (51), and a bus of the cylindrical planoconcave lens (90) and a bus of the planoconvex lens (80) are perpendicular to each other. The compensation light source system and the dynamic image detecting device for the train operation fault have increased light utilization rate and allow light spots finally formed to meet the shooting requirements of a camera.

The invention provides a large-current low-forward-voltage-drop silicon carbide Schottly diode chip. The large-current low-forward-voltage-drop silicon carbide Schottly diode chip comprises a back laminated metal electrode, a front laminated metal electrode, an ohmic contact layer, a substrate, a first epitaxial layer, a second epitaxial layer, a P-type protecting ring, a N-type ion implanted layer, a Schottly metal Pt layer, an annular passivation layer and an annular polyimide film. The invention further provides a preparation method for the large-current low-forward-voltage-drop silicon carbide Schottly diode chip. The preparation method is capable of, through using a parallel design of a PN junction and a Schottly junction, double-layer epitaxial growth, and ion implantation and nitrogen ion doping, generating a large implantation effect in a large current by using a Schottly metal Pt, reducing the electrical resistivity of the epitaxial layer, realizing the manufacture for the large-current low-forward-voltage-drop silicon carbide Schottly diode, thereby overcoming the defects in the prior art that the forward voltage drop of a device is reduced as well as the reverse leakagecurrent of the device is increased while a low barrier metal is selected and a chip area is increased, a rate of finished products is reduced, and the manufacturing cost is increased.

The invention relates to a vehicle seat with adjustable seat depth, which comprises a seat frame (20) including an adjustable front edge (26) and a cushion (36) supported by the seat frame (20). The seat extends around the front edge (26) and presents a position different with the front edge (26). The seat (36) comprises at least two layers which are an inner layer (40) and an outer layer (42). The inner layer (40) is arranged between the front edge (26) and the outer layer (42).

The present invention is automatic wide-tape tying method and automatic wide-tape tying machine. Unlike traditional tying process, the present invention has tying process including grasping the head of the tying tape from the tape feeding mechanism, rotating the tape feeding arm to make the tape encircle coiled steel to be tied, and tightening the tape the tape feeding mechanism holds with the driving mechanism. The automatic wide-tape tying machine of the present invention includes movable frame, driving box assembly with two driving mechanisms to control the tightening arm and the tape feeding arm separately, head frame with head assembly and tape feeding mechanism, and controller.

The invention relates to a tread profile of a pneumatic tire for vehicles having radially raised profile elements (1, 2, 3, 4) - in particular profile block elements and/or profile ribs - separated from each other by profile grooves (13, 14, 15), wherein at least one profile groove (14) is formed having a directional component of the main extent thereof in the circumferential direction U of the pneumatic tire for vehicles, wherein the profile groove (14) is formed having a groove root (18) aligned along the extent thereof and having a groove wall (16, 17) on each side of the groove root (18), formed having a groove wall (16, 17) extending in the radial direction R thereof from the groove root (18) to the shell surface radially outwardly delimiting the adjacent profile elements (2, 3), wherein a plurality of protrusions (20); is formed in the groove root distributed along the main extent of the groove (14), wherein said protrusions (20) each are made of at least two protrusion segment disposed adjacent to each other in the direction transverse to the main extent of the groove (14), wherein the protrusion (20) forms the shell surface of a cylindrical segment or a truncated cone segment in one of the two adjacent protrusion segments, and the shell surface of a cylindrical segment or a truncated cone segment in the other, wherein the axes of the cylinder segment or truncated cone segment are formed below the groove (14) having main direction components transverse to the main extent direction of the groove, wherein the two adjacent protrusion segments are formed having different radii of curvature over the extent of each in the protrusion segment.

The invention provides a bell jar type damper used in high altitude areas. By applying the bell jar type damper, the corona audible noise and the corona loss of a 330kV high altitude area electric transmission line can be effectively reduced, and the damper has the advantage of good damping performance. The damper comprises a damper head, a steel strand and a wire clamp. The damper head has a cylinder structure, one end of the damper head is provided with a lightening hole having a diameter of phi 3 in the inside, the other end of the damper head is provided with an installation having a length of L2 in the inside, and the damper head is provided with a drain hole having a outer diameter of phi 4 at the circular ring of the outer side of the lightening hole, wherein the drain hole runs through the circular ring in the axial direction. According to the bell jar type damper of the invention, through simulating calculation, the surface maximum field strength is reduced to 22kV/cm which is reduced by 19% compared with the surface maximum field strength of a conventional bell jar type damper; the corona onset voltage of the damper is 390kV in the 4000 meter altitude height simulation condition which is much higher than the 330kV rated operating voltage, so the occurrence of corona can be effectively restrained, and the damper has the advantage of good damping performance.

The invention discloses a return system of a ball screw, which is composed of a screw, a nut, several return components and balls; wherein the fixing groove of the nut is provided with a cross-section along the axial direction to provide a corresponding fitting of the return component, And this cross-section is provided with a continuous taper hole to connect with the through hole, and the cross section and the spiral track will not interfere; The shrinkage cavity is nested accordingly; the design of the return component can solve the current problem of the small radius of curvature of the return path and the destruction of the helical track alveolar by the fitting of the fixed groove, so that the radius of curvature of the return path can be increased, thereby improving the circulation of the balls in it smoothness.

The invention discloses an urban multilayer roundabout viaduct, comprising top-layer multi-direction small car lanes, middle-layer multi-direction small car lanes located at two sides of the top-layer multi-direction small car lanes and multi-direction road surface driving lanes located below the middle-layer multi-direction small car lanes, wherein the intersection center of the top-layer multi-direction small car lanes and the middle-layer multi-direction small car lanes is connected with a double-layer roundabout viaduct, the top-layer multi-direction small car lanes are parallel bidirectional small car lanes and are connected with a corresponding top-layer roundabout viaduct, the middle-layer multi-direction small car lanes are bidirectional small car lanes and are connected with parallely arranged transition bridges through approach bridges with certain angles and then connected with a roundabout viaduct module, and the multi-direction road surface driving lanes comprise straight and right-turn large car lanes, left-turn waiting lanes of branch roads and bicycle lanes. Since the urban multilayer roundabout viaduct is rapidly assembled into an integral body from steel structure modules, the urban multilayer roundabout viaduct has the advantages of small investment, a short construction cycle and no influence on normal traffic on the road during installation.

The invention provides a building drainage collection system. The building drainage collection system comprises a drainage pipe assembly, a transverse pipe drainage assembly communicating with the drainage pipe assembly, and a water seal assembly communicating with the transverse pipe drainage assembly, wherein the interior of the transverse pipe drainage assembly is of a flat cavity structure, and the bottom surface of a cavity of the transverse pipe drainage assembly is obliquely arranged. According to the building drainage collection system, the flat transverse pipe drainage assembly is adopted to be connected with the drainage pipe assembly and the water seal assembly, so that the occupied space is small, and the technical effect of sewage and wastewater drainage can be achieved without lowering a floor slab layer.

The invention provides a toilet drainage collection system. The toilet drainage collection system comprises a drainage pipe assembly, a transverse pipe drainage assembly communicating with the drainage pipe assembly and a water seal assembly communicating with the transverse pipe drainage assembly, wherein the drainage pipe assembly comprises a first water inlet pipe, a second water inlet pipe, afirst vertical pipe and a second vertical pipe, the first water inlet pipe and the second water inlet pipe are connected, the interior of the first water inlet pipe communicates with the interior of the second water inlet pipe, the inner edge of the second water inlet pipe is tangent to the inner edge of the first water inlet pipe, the first water inlet pipe is connected with the first vertical pipe, the interior of the first water inlet pipe communicates with the interior of the first vertical pipe, and a pipe wall cavity with an expanded volume is arranged at the communication part between the second water inlet pipe and the first water inlet pipe. According to the toilet drainage collection system, due to the fact that the pipe wall cavity with the expanded volume is arranged in the drainage pipe assembly, the curvature radius of wall-attached rotational flow of sewage of the drainage pipe assembly is increased, and it is guaranteed that the wall-attached rotational flow of the sewage can be achieved.

The invention provides a lifting auxiliary device and a lifting operation method of part to be operated. The lifting auxiliary device is matched with a steel wire rope to which the part to be operated is hung, so that the part to be operated ascends or descends on a body to operated. The lifting auxiliary device comprises a holding mechanism, a supporting frame and a pulley assembly. The holding mechanism is installed on the body to be operated and used for supporting the supporting frame and preventing toppling. The supporting frame is supported on the holding mechanism and used for supporting the pulley assembly. The pulley assembly is installed on the top of the supporting frame and used for supporting the steel wire rope and changing the direction when the steel wire rope winds around the pulley assembly. In the using process, the lifting auxiliary device is installed on the body to be operated, the steel wire rope is connected with the part to be operated, the steel wire rope winds around the pulley assembly and is driven to ascend or descend through the drive mechanism, and the part to be operated is lifted. The device is simple in structure and can adapt to an area with a narrow space, and thus large crane mechanisms like a lifting machine can be omitted. Moreover, the lifting auxiliary device is directly installed on the body to be operated, and a supporting mechanism is omitted.