151results 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 relates to a method for smoothing an inflection point of a discrete processing path, and belongs to the field of high-speed high-performance numerical control processing. The method is characterized in that an externally tangent quintic B-spline curve with 9 control points is adopted to carry out smoothing processing on the inflection point of the discrete processing path, and problems of low speed and easy fluctuation in conventional discrete path inflection point processing are solved. The method comprises the steps of firstly constructing concrete forms of a characteristic polygon of a B-spline curve formed by the 9 control points and a node vector of the characteristic polygon with the aid of a vertex overlapping method and a convex-hull property, and back calculating the control points under the constraint of approximating to an error allowance value; then carrying out one-time correction on the control point by adopting a proportion regulating algorithm based on a length constraint of a transition section; and finally, and acquiring a quintic B-spline curve for inflection point smoothing according to the acquired characteristic polygon and the node vector. The method provided by the invention can enable the smoothed path to reach G1 continuity, and the smoothed curve has a greater curvature radius at the inflection point under the same error approximating condition compared with an internally tangent method.

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 relates to a method which is used to shape and guide a wave winding (10) with a connecting section (12) which is connected through a winding end portion (14) into a rotor plate assembly or a stator-plate assembly (20) of a motor, wherein the method comprises: cutting a wave winding belt (52) which is composed of winding wires (56) whose lateral sections take rectangle shapes or circular shapes and are shaped continuously into wave windings (10) which are respectively provided with a certain number of waveforms, alternately encircling the winding wires around the lateral surface of a shaped protuberance (50) on the periphery of a shaped element which can be rotatably driven though a wire guiding device in a shaping process to lay, then, guiding the wave windings (10) which is cut by the wave winding belt (52) into the rotor plate assembly or the stator-plate assembly or a groove (89) which is radially opened outwards of a transferring tool (88) which is similar to a rotor, and transferring from the groove (89) of the transferring tool (88) which is similar to the rotor to the groove which is radially opened inwards of the rotor plate assembly or the stator-plate assembly. The invention is characterized in that the winding wires encircle on the periphery of two discs (46, 48) which are rotatably driven in parallel axially according to one line respectively or on the lateral surface of the shaped protuberance (50) which are cross-arranged on the periphery of the roller which is driven rotatably according to two lines, wherein the distance between the shaped protuberance (50) on a line and the shaped protuberance on next line can be enlarged like this in an angular range that the wave winding belt (52) is driven on the periphery of the discs (46, 48) and the roller, which enables the lateral surface of the shaped protuberance (50) shapes the winding end portion (14) of the wave winding (10).

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.

Characters of the method includes following steps: (1) oxidation; (2) first photo etching; (3) boron diffusion; (4) second photo etching; (5) sputtering barrier metal; (6) vaporizing multilayer of metal on face side; (7) third photo etching; (8) annealing; (9) thinning rear face; (10) vaporizing multilayer of metal on rear face; (11) alloying (12) testing and cutting to separate slices. Useful effects are: reducing influences from surface state, enhancing forward and backward characteristics as well as capability of inverted voltage resistant and anti burning, preventing oxidation of metal layer prolonging service life, avoiding interdiffusion between each metal and silicide, raising fatigue resistance, and reinforcing stability of parts.

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 relates to an optical cable, in particular to a novel direct-protection type outdoor optical cable, comprising a plurality of optical fiber units which are arranged in a jacket, wherein each optical fiber unit is an integral structure which comprises a plurality of bare optical fibers, water block material is filled between the optical fiber units and the jacket, and at least one optical cable reinforcing piece is embedded into the jacket along an axial direction. The Novel direct-protection type outdoor optical cable changes the method that the optical cable bears external force by arranging optical fiber residue length in a traditional central tube cable, further increases the curvature radius of the optical fibers in the optical cable, improves the optical characteristic and the mechanical characteristic of the optical cable, avoids the optical fiber bending strain caused by the optical fiber residue length which exists in the cable for a long period, improves the high and low temperature capability of the optical cable and obviously improves the stretching and flattening performance of the optical cable.

The invention relates to a spiral bevel gear machining method, in particular to a spiral bevel gear machining method based on a universal four-axis numerical control machine tool and a ball-end milling cutter. By steps of tooth surface discrete point calculation, gear solid modeling, ball-end milling cutter diameter determination, cutter path creation, tooth surface machining parameter calculationand tooth surface machining process, various spiral bevel gears can be machined on a universal four-axis numerical control miller without purchasing of expensive special machine tools or milling cutter discs. Compared with gear blend surfaces machined by milling cutter discs, the blend surface machined by the ball-end milling cutter has larger radius of curvature, and bending fatigue strength ofthe gears can be improved. Compared with the one-side cantilever arrangement mode when the gears are machined by the milling cutter discs, the two-end support mode of a chuck and a tailstock tip has better rigidity, deformation caused by cutting force can be reduced, and accordingly, machining accuracy of tooth surfaces is improved.

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.

Flexible semiconductor devices based on flexible freestanding epitaxial elements are disclosed. The flexible freestanding epitaxial elements provide a virgin as grown epitaxy ready surface for additional growth layers. These flexible semiconductor devices have reduced stress due to the ability to flex with a radius of curvature less than 100 meters. Low radius of curvature flexing enables higher quality epitaxial growth and enables 3D device structures. Uniformity of layer formation is maintained by direct absorption of actinic radiation by the flexible freestanding epitaxial element within a reactor. In addition, standard post processing steps like lithography are enabled by the ability of the devices and elements to be flattened using a secondary support element or vacuum. Finished flexible semiconductor devices can be flexed to a radius of curvature of less than 100 meters. Nitrides, Zinc Oxides, and their alloys are preferred materials for the flexible freestanding epitaxial elements.

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.

A heat-shrinkable tube dry expander includes a feed device, a heating device, an expanding die and a draughting mechanism that are arranged from up to down. The heating device includes a far infrared heater; the far infrared heater is provided with an inner heating cavity. The dry expander has a high heating efficiency and drives stably; the axial shrinking rate of the manufactured products is little; besides, the dry expander is environment-friendly, saves energies, has no pollution, protects the health of operating personnel and saves a great amount of water. The invention also provides a dry expander set which is formed by multiple dry expanders; can reduce the quantities of the operating personnel to the best, reduces the human cost and improves the production efficiency. An operating platform is arranged between every two dry expenders, thus being convenient for operation and maintenance as well as being capable of improving the personal safety of the operating and maintaining personnel.

A junction terminal structure of a lateral high-voltage power semiconductor device belongs to the technical field of semiconductor power devices. By shortening the length of the N-type drift region at the curvature terminal portion of the lateral high-voltage power semiconductor device, the N-type drift region is separated from the P-well region by a certain distance, and the spaced part is replaced by a P-type substrate, which is equivalent to introducing a P-type substrate. The additional charge reduces the peak value of the electric field at the pn junction formed by the original P-well region and the N-type drift region, and at the same time introduces a new peak value of the electric field at the pn junction formed by the P-type substrate and the N-type drift region, and increases The curvature radius of the curvature terminal is improved, the excessive concentration of the power line is avoided, and the breakdown voltage of the device is improved. The surface of the N-type drift region can also be combined with a surface RESURF structure or a super junction structure. The invention can reduce the width of the curvature terminal of the device, save the layout area of ​​the device, and is compatible with the CMOS process. The invention can be used to manufacture high-voltage, high-speed, and low-conduction-loss lateral high-voltage power devices with excellent performance.

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 object of an illumination device of the invention is to further improve the light use efficiency of a lighting device of a color re-capture type. In a lighting device 10 of a color re-capture type, a color wheel 40 having filter films 41R-41B is located at an opening 23 of an emitting port 20b of an integrator 20, a center reflecting mirror 30 is located at an opening 22 of an incident side connected with the integrator 20 and on an optical axes 80 of a lamp 13 to reflect a light to a side of the opening 22 of the integrator 20. In the light which is not passed through the color wheel 40 to return to the integrator 20, the light 73 leaked from the opening 22 of the incident side is reflected by the center reflecting mirror 30 so as to return to the integrator 20, thereby further improving the light use efficiency.

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 discloses a single photon avalanche photodiode and a manufacturing method thereof. A maximum bias voltage borne by a protection ring of an existing single photon avalanche photodiode is too low. The manufacturing method of the single photon avalanche photodiode comprises the following steps that a silicon substrate is uniformly doped with a p- substrate and a center of the p- substrate is doped with a deep n trap layer; an outer end of the deep n trap layer is doped with a first p+ type semiconductor layer and an outer side of the first p+ type semiconductor layer is doped with a p- trap layer; a periphery of the p- trap layer is doped with a p- type semiconductor layer; a periphery of the p- type semiconductor layer is doped with a n+ type semiconductor layer and a periphery of the n+ type semiconductor layer is doped with a second p+ type semiconductor layer; outer ends of the first p+ type semiconductor layer and the second p+ type semiconductor layer are provided with anode electrodes and an outer end of the n+ type semiconductor layer is provided with a cathode electrode. In the invention, a maximum reverse bias voltage borne by the avalanche photodiode can reach 30.51V.

Flexible semiconductor devices based on flexible freestanding epitaxial elements are disclosed. The flexible freestanding epitaxial elements provide a virgin as grown epitaxy ready surface for additional growth layers. These flexible semiconductor devices have reduced stress due to the ability to flex with a radius of curvature less than 100 meters. Low radius of curvature flexing enables higher quality epitaxial growth and enables 3D device structures. Uniformity of layer formation is maintained by direct absorption of actinic radiation by the flexible freestanding epitaxial element within a reactor. In addition, standard post processing steps like lithography are enabled by the ability of the devices and elements to be flattened using a secondary support element or vacuum. Finished flexible semiconductor devices can be flexed to a radius of curvature of less than 100 meters. Nitrides, Zinc Oxides, and their alloys are preferred materials for the flexible freestanding epitaxial elements.

The invention provides a preparation method of a gallium nitride single crystal based on an ScAlMgO4 substrate. The preparation method comprises the following steps: (1) providing the ScAlMgO4 substrate; (2) growing a buffer layer on the surface of the ScAlMgO4 substrate; (3) carrying out annealing treatment on the buffer layer; (4) growing a GaN crystal on the buffer layer; and (5) cooling to make the GaN crystal automatically stripped from the ScAlMgO4 substrate. A complex process of depositing GaN and carrying out pretreatment to manufacture a mask or a separation layer by MOCVD is not needed, so that the production cost is effectively reduced; compared with a traditional substrate such as sapphire, the GaN substrate has higher quality and larger curvature radius, and the problem that OFFCUT is uneven when GaN of 4 inches or above grows is solved; and finally, the continuous growth of the crystal bar with the thickness of 5 mm or above can be realized, and the cost is further reduced.

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.