64 results about "Annular beam" patented technology

The invention relates to the technical field of heat dissipation devices, in particular to an annular beam heat dissipation device based on an MEMS device, and the device comprises an air inlet grid port which is located at the uppermost end of the heat dissipation device and is used for enabling external air to enter the heat dissipation device and filtering impurities in the air at the same time; the piezoelectric vibrator is used for driving airflow and providing a reliable power source for each structure at the same time; the flexible FPC is used for providing stable electric energy supply and signal transmission for the piezoelectric vibrator; and the impact platform is used for receiving the heat of the equipment needing to be cooled, taking away the heat through air beam heat exchange and discharging the air flow after heat exchange at the same time. Air flow driving force is formed through vibration of the piezoelectric ceramic piece in an electric field, external cold air is driven into the heat dissipation device, efficient heat dissipation is achieved, and the heat dissipation problem that the performance of a CPU is limited in a narrow space is solved.

The invention relates to a method for curing a liner for the rehabilitation of pipes or channels, in which laser light from the curing of a resin-impregnated liner is used, and to the use of an axicon for generating an annular beam profile of a laser for curing a liner for the rehabilitation of pipes or channels.

The application discloses a three-piece Bessel beam shaping system with a diffraction ring, and belongs to the technical field of laser processing, comprising: a beam shaping mirror, a first collimating mirror and a focusing mirror; the incident surface and the exit surface of the beam shaping mirror are annular planes and annular aspheric surfaces respectively, and are used for shaping a collimated Gaussian beam into a point annular beam with energy gradually decreasing from inside to outside; the incident surface and the exit surface of the first collimating mirror are annular aspheric surfaces and annular planes respectively, and are used for collimating the point annular beam; the incident surface of the focusing mirror is a combination of an axicon surface and a spherical surface, and the exit surface is a plane; the focusing mirror is used for focusing the collimated point annular beam into a Bessel beam with a diffraction ring. The application can significantly improve the focal depth of the Bessel beam in laser processing, and can also effectively remove processing materials such as ink. In addition, the focal depth of the Bessel beam in the application is adjustable, and the adjustment mode is more, the flexibility is higher, and is suitable for different laser processing scenes.

The invention belongs to the technical field of environmental protection equipment, and particularly relates to an anti-explosion heat-insulation coal gas high-temperature electric dust remover and a dust removal method. The invention also discloses a method. The device comprises a shell, an annular beam, a heat-insulating high-temperature-resistant explosion venting device, a heavy-load large-displacement sliding support, a dust hopper, a scraper dust conveying device, a dust collecting and conveying mechanism, a dust cleaning mechanism and a cathode and anode matching structure. The shell can bear explosion venting pressure impact of 0.1 MPa, and the shell is of an ultra-large shell structure with the maximum diameter phi of 15.8 m; the dry-process fine dust removal equipment for the low-rank coal pyrolysis gas adopts a high-temperature-resistant and heat-insulating design, can be operated under the condition that the inlet flue gas temperature is less than or equal to 450 DEG C, and the outlet temperature drop is less than or equal to 50 DEG C. The dry-process fine dust removal equipment for the low-rank coal pyrolysis gas adopts a mechanical tracking floating type rapping and sound wave ash removal combined ash removal design. The device meets high-temperature heat insulation operation, tar precipitation and adhesion are avoided, it is guaranteed that the dust removal efficiency reaches 99% or above at the high temperature, and the problem that the dust content of low-rank coal pyrolysis gas and tar recycled from the pyrolysis gas is high is solved.

The utility model discloses a prefabricated steel lattice for vertical shaft bottom sealing underwater separated warehouse pouring, the steel lattice is installed at the bottom in a vertical shaft, the steel lattice comprises core warehouse steel and corner warehouse steel, the core warehouse steel is of a #-shaped structure, right-angle-shaped locking corners are arranged at the four corners of the core warehouse steel, and the corner warehouse steel is connected with the core warehouse steel. The four pieces of corner bin steel are of a right-angle-shaped structure, and the right-angle parts of the four pieces of corner bin steel are installed on the four locking corners of the core bin steel correspondingly. The combined type steel lattice has the advantages that the combined type steel lattice is more beneficial to underwater assembly under limited conditions and can be prefabricated in advance due to the fact that vertical tunneling equipment is hung and the annular beam is arranged for enhancing rigidity of a blade foot area; the integrity of the concrete can be ensured by pouring the large-volume concrete at the bottom of the vertical shaft in different bins underwater; and the density of the bottom sealing concrete can be guaranteed through bin division pouring, holes generated by underwater concrete pouring are eliminated, and water leakage is prevented.

The invention provides a hollow laser processing optical system based on a beam splitting reflector, which belongs to the technical field of laser processing and comprises a collimating lens, a conical lens, a beam splitting reflector, a first plane reflector, a second plane reflector, a third plane reflector, a fourth plane reflector, a beam combining reflector and a focusing lens which are sequentially arranged along a light path. The collimating lens collimates a laser beam, the conical lens converts a circular beam into an annular beam, the beam splitting reflector splits the annular beam into two semi-annular beams, the two semi-annular beams are combined into a complete annular beam by the beam combining reflector after being reflected by the plane reflector, and the complete annular beam is focused by the focusing lens to process a material. The reflector is used for achieving beam splitting instead of a beam splitting lens, the laser processing power and the system stability are improved while light beam shielding is avoided, and the requirements of coaxial wire feeding laser processing and laser-arc coaxial processing can be met.

The present invention provides a light-generation system (1000) including a first light-generation device (110), a luminescent body (1200), a thermally conductive element (500), and an axicon-like optical element (400), wherein: (A) the first light-generation device (110) is configured to generate first device light (111), the first light-generation device (110) including one or more of a superluminescent diode and a solid-state laser; (B) the luminescent body ( (1200) includes a luminescent material (200) configured to convert at least a portion of the first device light (111) into luminescent material light (201), the luminescent body (1200) having an annular shape; and (C) a thermally conductive element (500) configured (a) to be in thermal contact with at least a portion of the luminescent body (1200), and (b) to convert at least one of the first device light (111) and the luminescent material light (201). (D) the axicon-like optical element (400) comprises a first portion (410) and a second portion (420) and has an optical element length (L), the first portion (410) having a conical shape, a first length (L1) and comprising a first end window (411), the second portion (420) having a cylindrical shape, a second length (L2) and comprising a second end window (422), where 0.7≦L2 / L<1; (E) the axicon-like optical element (400) comprises: (a) a first portion (410) and a second portion (420) and having an optical element length (L), the first portion (410) having a conical shape, a first length (L1) and comprising a first end window (411), the second portion (420) having a cylindrical shape, a second length (L2) and comprising a second end window (422), where 0.7≦L2 / L<1; A light generating system is provided that is configured to (a) receive at least a portion of a first device light (111) via a portion (410) and provide an annular beam of the first device light (111) to a luminescent body (1200) via a second portion (420), and (b) collect at least a portion of a luminescent material light (201) via the second portion (420) and provide a beam of luminescent material light (201) via the first portion (410).

The invention provides a heat absorber installation method using a heat absorber sliding device and the heat absorber sliding device. The heat absorber installation method comprises the steps of installing a heat absorber sliding rail, installing a sliding shoe and sliding a heat absorber. The step of installing a heat absorber sliding rail ensures that the heat absorber sliding rail is composed of two parallel sliding rails; the step of installing the sliding shoe comprises the steps that a bottom floating plate of a sliding device is installed in a sliding rail, the bottom floating plate lifts a main oil top till a square flange on the oil top is tightly attached to a flange on the lower surface of an annular beam of a heat absorber, the sliding device is adjusted, the oil top flange is right opposite to a supporting annular beam bottom plate flange, and bolt connection is used for final tightening. And S30, the step of sliding the heat absorber comprises the substeps that after it is checked and confirmed that the installation positions of the sliding devices are correct, the center main jack is jacked till the center main jack makes contact with a flange of the supporting ring beam, the four sliding lifting devices are operated by one control system, it is ensured that the hydraulic lifting devices act at the same time, and the heat absorber is horizontally lifted.

The invention discloses an annular light generating device based on a diffuser, which is applied to the technical field of optical equipment, and aims to solve the problems that the annular light generating device is complicated in structure and inconvenient to use and influences the performance of an annular light beam, the annular light generating device comprises the diffuser and a driving mechanism, and the diffuser is connected with the driving mechanism; a first side surface of the diffuser is provided with a micro-lens unit array for diffusing and homogenizing light beams, and a second side surface of the diffuser is provided with a grating for deflecting incident light beams; the first side surface is opposite to the second side surface; the driving mechanism is used for driving the diffuser to rotate around the axis; the diffuser is used for performing scattering and dodging shaping on vertically incident laser beams through the micro-lens unit array on the first side surface in the rotating process, outputting light beams with inclination angles through the grating on the second side surface, and rotating at a high speed under the driving of the driving mechanism to form annular light beams; the device is simple in structure, small in size, low in manufacturing and machining difficulty, convenient to use and capable of improving the annular beam performance.

This invention discloses a flat plate lens and device for multi-angle annular uniform illumination in the terahertz band, relating to the field of terahertz active imaging. By setting multiple annular grooves or constructing a randomly rough surface on the exit surface of a flat plate lens with an air hole array and a center point defect, this invention can convert a Gaussian-distributed terahertz beam irradiated by a terahertz source into a multi-angle annular uniform illumination beam. This allows the terahertz wave to illuminate the target from different angles, increasing the reflected wave signal entering the detection system. This has significant application value for terahertz waves in non-destructive testing and human security inspection. Furthermore, in a reflective terahertz active imaging system, compared to a circular beam, the annular beam can convert small-angle incident light with low imaging utilization in the central part into large-angle incident light with higher imaging utilization, thus improving energy utilization while providing multi-angle illumination.

The invention relates to a large-diameter ring beam positioning and shape and position detection method based on a three-dimensional information technology. The method comprises the steps that firstly, modeling is conducted in advance; 2, establishing a construction control network; 3, establishing a mold coordinate; 4, settlement monitoring; and 5, performing surface three-dimensional scanning and comparison. By introducing the three-dimensional information technology and advanced measuring equipment, the overall shape and the curved surface smoothness of the annular beam are efficiently and accurately measured and detected, and powerful guarantee is provided for the construction quality and precision of the large-diameter annular beam in a large-scale venue building.

The utility model discloses a hydraulic pressure reverse buckling type quick connection operation platform, including the platform of the through hole of central opening, the platform bottom surface fixedly has the base in the middle, it is the circular ring body of being able to set up on the top of connecting flange, the annular beam group is by the inner annular beam and outer annular beam of interval cover in the base, a plurality of jack sets up in each hydraulic installation hole on the inner annular beam in its piston rod rod end outward setting mode, and a plurality of push rods are respectively threaded in each hydraulic installation hole on the outer annular beam, and its one end is fixed in the piston rod rod end, and the other end is fixed with wedge locking assembly, every wedge locking assembly includes upper wedge and lower wedge, and both are obliquely slidingly arranged, the hydraulic pressure reverse buckling type quick connection operation platform is applicable to the quick fixed connection of offshore wind power single pile foundation and guide pipe frame foundation top operation platform, and can ensure the fixed connection stability of operation platform and fixed foundation, and the reliability is strong.

The utility model provides a high power laser cladding annular light spot optical system based on conical mirror and double ridge mirror, including the beam combining unit, the conical mirror, third collimating mirror, annular light spot conversion unit and focusing unit who sets gradually along the light path, the beam combining unit is used for the first wavelength laser and second wavelength laser beam combining as a coaxial parallel light, the conical mirror is used for converting parallel light into the annular light that spreads outward, third collimating mirror is used for collimating the divergent annular light as parallel annular light, annular light spot conversion unit is used for converting parallel annular light into vertical annular light, focusing unit is used for focusing vertical annular light to work piece surface, this design realizes preheating - processing - post heat treatment integrated process, effectively reduces the temperature gradient of the molten pool, reduces the defect such as blowhole, crack, improves the cladding layer bonding strength, and effectively reduces the damage probability of protective glass and other components.

The invention discloses an anti-floating and anti-settling vertical shaft structure and a tunneling construction method thereof, and belongs to the technical field of vertical shaft tunneling. The structure comprises an outer lining arranged along the well wall and a bottom plate arranged at the well bottom, at least one set of steel sleeves are arranged on the inner side of the outer lining, a concrete pile is arranged at the bottom of the bottom plate, the lower end of the concrete pile extends into a bearing stratum below, and a set of vertical steel bars are reserved on the bottom plate in the circumferential direction of the bottom plate; an annular beam is arranged at the intersection of the set of vertical steel bars and the set of steel sleeve extending steel bars, and the vertical steel bars and the steel sleeve extending steel bars are anchored into annular beam steel bars. Based on the structural design of the concrete pile, the bottom plate is connected with the lower rock soil, the structural design can reduce the construction thickness of the bottom plate on the basis of ensuring the structural stability and reduce the occurrence of sedimentation, and can provide a vertical supporting force for the bottom plate in the sedimentation process to avoid the occurrence of sedimentation; and a downward pulling force can be applied to the bottom plate when the bottom plate receives a floating acting force, so that the occurrence of floating is avoided.

The invention relates to the field of steam curing, and discloses an informatization management intelligent annular beam factory steam curing system which comprises a steam curing bin and a plurality of steam pipe fittings, a steam curing cavity is formed in the steam curing bin, and the steam pipe fittings are arranged at the top of the steam curing cavity in a sliding mode. A plurality of bearing assemblies distributed in the length direction of each steam pipe fitting are correspondingly arranged below each steam pipe fitting, the bearing assemblies are arranged at the bottom of the steam curing cavity, the bearing assemblies are used for bearing arc-shaped assemblies of an annular beam, and based on the number of the bearing assemblies triggered by the arc-shaped prefabricated beam sections, the number of the arc-shaped prefabricated beam sections is larger than that of the arc-shaped prefabricated beam sections. The position of each section of the arc-shaped precast beam section can be identified by identifying the position of each section of the arc-shaped precast beam section, so that the steam pipe fitting can be driven to automatically slide to the corresponding section, and a spray hole of the steam pipe fitting directly faces an actually-borne arc-shaped beam section area, so that accurate steam coverage is realized, the steam pipe fitting dynamically slides along with the position of a bearing assembly, and the spray center is always aligned with the curvature center of a component; personalized steam path planning is achieved, and the problem that a traditional spray pipe is fixed is solved.

The utility model relates to reinforcing device technical field discloses a kind of annular beam wood formwork reinforcing devices, including first cross bar, second cross bar and vertical pole, several second cross bars are connected between two vertical poles vertically to constitute a support frame, two support frames are vertically arranged side by side, and two second cross bars of the same height on two support frames are connected with two first cross bars side by side from front to back, and the space of the annular beam wood formwork limiting is enclosed by several first cross bars and several second cross bars in two support frames;The connecting height of second cross bar on vertical pole is adjustable, and the connecting position of first cross bar on second cross bar is also adjustable;The outer side of the opposite side of two support frames is equipped with support mechanism;Bottom between two support frames is also equipped with fixed mechanism.The utility model has realized the effective reinforcement to annular beam formwork, and the mounting frame with reinforcing effect also has the advantages of simple installation, easy adjustment, not easy to dump when using.

Disclosed in the present invention are a reflective scanning super-resolution optical microscopy system and method based on annular illumination. The system comprises a sample displacement module, an optical microscopy imaging module, an annular beam generation module, a beam scanning module, a super-resolution focusing illumination and collection module, a super-resolution optical imaging module and a computer. The advantages of annular beam illumination, high focusing efficiency of conventional lenses and fast beam scanning speed are utilized to achieve high-efficiency super-resolution focusing illumination, so as to further achieve fast super-resolution optical microscopic imaging by using conventional optical lenses; two-dimensional beam scanning is used to achieve non-labeled far-field super-resolution two-dimensional microscopic rapid imaging; and non-labeled far-field super-resolution two-dimensional microscopic imaging is performed on samples at different axial positions to acquire super-resolution two-dimensional microscopic imaging of different cross sections of the samples, so as to achieve three-dimensional tomography. The present invention can be applied to non-labeled super-resolution microscopic rapid imaging of biological samples, and can also be applied to industrial-related super-resolution microscopic detection and other fields.

The utility model relates to the technical field of subway construction, in particular to a connector structure of a newly-built channel of an existing underground station. Comprising a connector ring beam arranged on the outer side of the side wall of the existing underground station, the connector ring beam is arranged along the annular connecting face of the side wall of the existing underground station and a newly-built channel concrete structure, the connector ring beam is in an integrally-closed annular beam shape, and the contact face between the connector ring beam and the side wall of the existing underground station is arranged in the vertical direction; the connector ring beam steel bars are fixedly connected with the side wall of the existing underground station through embedded steel bars arranged in the horizontal direction. The connector ring beam located on the outer side of the side wall of the existing underground station can be poured at a time, the number of construction joints is reduced, and a closed reinforcing ring frame structure is rapidly formed around the holing part, so that the side wall of the existing underground structure can still keep good stability and resist various external forces after holing, and the service life of the side wall is prolonged. And then the existing structure in the interface range is chiseled away at a time, so that the construction is more convenient.

Disclosed are a multifocal point-ring spot generation system and a laser welding method in the technical field of laser processing. The system includes an annular light source, a first collimating lens, an annular beam generation module, and a first reflector arranged sequentially at intervals along a first straight-line direction, and a point light source, a second collimating lens, a first focusing lens, a multi-curvature hollow reflector, and a second focusing lens arranged sequentially at intervals along a second straight-line direction, where the multi-curvature hollow reflector and the second focusing lens are each provided with a through hole at their centers for allowing a beam emitted by the point light source to pass therethrough, and the multi-curvature hollow reflector has an adjustable mirror surface curvature. The system can solve the technical problems of high processing cost and poor stability in deep welding caused by structural constraints of point-ring lasers in the prior art.

The utility model provides an adjusting device of a particulate matter measuring system. The adjusting device comprises a light source assembly, a conical lens, a measuring chamber, a light receiving assembly and a dimming device, the light source assembly is used for emitting parallel light, the conical lens converts the parallel light into a conical annular light beam, smoke particles are introduced into the measuring chamber, the annular light beam passes through a two-phase flow containing the smoke particles and acts with the particles to generate scattered light, and the scattered light generated by the particles in the annular measuring area is received by the light receiving assembly; the concentration sensor is used for obtaining concentration of particles; the dimming device is used for calibration; pure gas without particulate matter is filled in the measuring area, the annular light beam does not generate scattered light, and after part of light of the axis light beam is blocked by the dimming device, the axis light beam is received by the light receiving assembly and used for cross-point calibration. The adjusting device of the particulate matter measuring system has the obvious advantages of simplifying the calibration process, improving the calibration precision, enhancing the system flexibility, optimizing the structural design and the like.

The invention relates to the technical field of tunnel mine construction, in particular to a tunnel and mine construction lining plate feeding type trolley which comprises a plane rail and further comprises a mounting assembly, and the mounting assembly comprises a supporting door frame, a supporting rail, a rotating support, a lifting rail, a clamping support, a first annular beam, an adjusting frame, a suction cup, a moving component, a translation component and an adjusting component. And through movement of the clamping support and movement of the suction cups, the linings can be mechanically carried to the corresponding installation positions to be installed, and therefore consumption of manual labor force is reduced.

The application discloses a kind of orthogonal formula cable net air film support structures for shallow round warehouse construction, including orthogonal formula cable structure, lower air bag type membrane structure, upper air bag type membrane structure and connecting cooperation assembly;The orthogonal formula cable structure is fixed on the shallow round warehouse concrete ring beam.Greatly improve construction safety, reduce operation risk, reduce high-altitude dangerous operation: core components (such as main cable, secondary cable, membrane body) are prefabricated in factory, only need to assemble and hoist on site, avoid traditional full frame a lot of high-altitude erection operation, reduce the hidden trouble of high formwork collapse, high-altitude falling object from source, main cable and secondary cable are realized rigid fixation by metal connecting buckle, avoid cable net dislocation.Optimize load conduction, improve structural bearing reliability, orthogonal cable net balanced stress, main cable and secondary cable are perpendicular and cross and adhere to each other, form mesh stress system, the load of conical shell formwork is evenly transmitted to shallow round warehouse concrete ring beam, avoid local stress concentration.

Reduces malfunctions in optical modules caused by collisions. [Solution] The optical probe 10 comprises an optical module 11 configured to irradiate the inner surface of an object to be inspected with an annular beam 20, an imaging device 12 positioned to receive the light reflected from the inner surface of the object to be inspected, and a cover member 32 configured to cover the optical module 11.

The utility model discloses a kind of laser processing assembly and laser processing equipment, the laser processing assembly includes: along laser transmission direction common optical axis is sequentially arranged flat concave lens, flat convex lens, cone lens, aspherical condenser lens and focusing lens;Laser beam emitted by laser, form annular beam after being diffused by flat concave lens, the diffraction angle is reduced by flat convex lens and cone lens in turn, annular beam is modulated to form annular parallel light beam by aspherical condenser lens, annular parallel light beam is focused to the processing position of object to be processed by focusing lens.Can the laser beam emitted by laser is shaped focus, then induce modified glass.

The present application provides a kind of narrow gap welding device and method based on coaxial composite annular laser of droplet, it is suitable for high-precision narrow gap welding.The device includes welding wire melting system, annular beam system, wire feeding system, water cooling kit, metal melt control assembly and gas pressure system.Welding wire melting system heats metal welding wire by induction heating coil, generates droplet jet, and annular beam system generates molten pool.Droplets are vertically dropped into the molten pool of narrow gap workpiece in the form of jet through the metal melt control assembly, forming high-quality welds.The control system monitors the gap size in real time through laser profile scanner and adjusts the electronic adjustable nozzle to control the size and flow of droplets.The present application successfully solves the strong coupling problem between welding wire and laser by melting welding wire with induction heat source, and significantly reduces the heat input in the welding process, thereby reducing deformation and defects in narrow gap welding.

This invention provides a multi-focal point ring spot generation system and a laser welding method. [Solution] The system comprises annular light sources 11, a first collimator lens 12, an annular beam generation module 13, and a first reflector 14, arranged sequentially at intervals along a first linear direction; and point light sources 21, a second collimator lens 22, a first focusing lens 23, a multi-curvature hollow reflector 24, and a second focusing lens 25, arranged sequentially at intervals along a second linear direction. Through holes are provided in the centers of the multi-curvature hollow reflector and the second focusing lens through which the light beam emitted from the point light source passes, and the curvature of the mirror surface of the multi-curvature hollow reflector is adjustable. This solves the technical problems of conventional point-ring laser devices, such as soaring processing costs and reduced stability in deep welding, which are caused by structural constraints.

The invention relates to a method for forming a non-pneumatic tire constructed from a thermoplastic elastomer that is pre-tensioned during the process of its formation. The pre-tensioning is provided by thermal means that are naturally available in the forming process. This creates an efficient manufacturing process without the complexity of adding pre-tensioning by mechanical means. The method for forming a non-pneumatic tire includes: injecting a tread portion (101) and an annular beam (102) having circumferential reinforcements into a mold that only supports a tread pattern on the outer diameter limits of the tread pattern; injecting a rim (104) extending radially inward from the annular beam (102); and forming an annular support (103) comprised of a thermoplastic elastomer extending radially inward from the annular beam (102). The thermoplastic elastomer is hardened, and the tire is removed from the mold.

The application discloses a ventilation heat absorption tower, which comprises a radial thin-walled column, a thin-shell wall, an annular beam, a surface skin, a herringbone support, an equipment layer, a conversion layer and a combined roof. The tower structure top supports a molten salt heat absorber, which is connected with a molten salt pipeline, a cold molten salt tank, a hot molten salt tank and a steam generator in the structure, and together forms a heat absorption system. The structure is provided with an air inlet layer, which is connected with a ventilation device outside the structure, and an air outlet layer, which together constitute a natural ventilation direct air cooling system, realizing a ventilation heat absorption tower structure scheme, solving the problems of large power consumption of a traditional direct cooling system, large land occupation of an indirect cooling system, long construction period and high construction cost, and meanwhile, the structure has large overall rigidity, good stability and can easily meet the displacement limit value of the structure top caused by solar light gathering. The application can be widely applied to tower type photo-thermal power generation areas with different wind loads and seismic intensities.

The embodiment of the application discloses a wind wheel preparation method, a wind wheel and a cross-flow fan, and relates to the technical field of wind wheels. The wind wheel preparation method comprises the following steps: preparing a cylindrical body integrated with blades; cutting a region between two adjacent blades on the cylindrical body in a wall thickness direction of the cylindrical body and forming a cutout, the cutout penetrating from an outer wall of the cylindrical body to an inner wall of the cylindrical body, so as to form an air inlet and outlet on the cylindrical body; since the blades are integrated with the cylindrical body, a central shaft is not needed, so that the central shaft is prevented from blocking the air inlet flow, airflow segmentation and turbulence phenomena are eliminated, the air inlet flow is smooth and uniform, and the air outlet efficiency and stability of the fan are improved; meanwhile, the cylindrical body maintains a complete wall thickness at a position that is circumferentially staggered from the cutout, and a continuous cylindrical wall structure is formed, the continuous cylindrical wall connects all blade roots into an integrated whole as an annular beam, centrifugal force and aerodynamic force borne by the blades are transmitted to the continuous cylindrical wall through the roots, and the whole cylindrical wall bears the force together, so that the wind wheel has high structural strength and rigidity.

The invention discloses a split type beam limiting device capable of being quickly disassembled and assembled for medical isotope production, which is characterized in that a plurality of mounting surfaces are arranged on an isotope production target station, and a beam limiting device which is mounted by adopting a conformal tool and is adjustable in target head position is mounted on each mounting surface. The beam limiting device which is installed by adopting the conformal tool and has the adjustable target head position is used for forming a beam envelope with a set shape; each beam limiting device is of a chain type clamp rapid disassembly and assembly structure. The split type beam limiting device is used for reducing the thermal power of each beam limiting device. According to the invention, an integral annular beam limiting device is changed into a split adaptive beam limiting device, so that heat is uniformly distributed on four beam limiting device structures, the beam heat power received by a single beam limiting device is reduced, a flange fixed connection mode is changed into a quick release structure, the dose irradiation time is reduced, and the body health of maintenance personnel is protected. The operation and maintenance time of a production target station is shortened, the isotope production work is quickly recovered, and the economical efficiency is improved.