53results about How to "High coincidence" patented technology

The utility model relates to the technical field of laminated glass, in particular to a laminated glass cold vacuumizing edge sealing device which comprises a fixing frame, a motor is fixedly installed on the upper surface of the fixing frame, and the output end of the motor is fixedly connected with a connecting column. A first two-way screw rod is rotated to drive two clamping plates to clamp a laminated glass body, a motor is started to drive a connecting frame to rotate around the central axis of a connecting column through the connecting column, and in the process, the clamping plates can move along the edge of the laminated glass body, so that the laminated glass body is conveniently clamped. The spring can be stretched according to different rotating angles of the connecting frame, and the clamping plate is attached to the laminated glass body under the action of resilience force of the spring until the clamping plate surrounds the laminated glass body by a circle, so that the glue sealing machine seals the edge of the laminated glass body through the glue sealing pipe; and therefore, the effect that the laminated glass bodies in different shapes can be laminated and sealed by the clamping plates through the tension of the springs is achieved.

The invention provides a reaming device and a reaming method for geotechnical engineering investigation, and relates to the technical field of investigation engineering machinery. The reaming device comprises a supporting base, a main frame body, a drill rod assembly, a soil taking assembly and a drill bit with a soil drilling assembly and a releasable soil storage assembly. By designing the supporting base, the main frame body, the drill rod assembly, the soil taking assembly and the drill bit provided with the soil drilling assembly and the releasable soil storage assembly, the releasable soil storage assembly can collect crushed rock soil in the reaming process, and the drill bit extends out of the soil taking assembly when upwards leaving a new hole, so that the soil taking assembly can take out the new hole; the releasable soil storage assembly is opened by the matcher on the soil taking assembly, and the crushed rock soil falls on the soil taking assembly, so that the crushed rock soil is conveniently taken out, and efficient and rapid reaming operation can be realized.

The invention belongs to the technical field of helicopter fatigue tests, and particularly relates to a helicopter moving ring fatigue test device and test method. According to the composition relation of the device, the lower bottom face of an immovable ring false part installation support is installed on a fixed platform, and an immovable ring false part is installed above the immovable ring false part installation support; the outer cylindrical surface of the fixed ring false part and the inner cylindrical surface of the helicopter moving ring large bearing are mounted in an interference fit manner; the actuator cylinder bases are installed on the fixed platform and evenly distributed on the periphery of the fixed ring false part installation support, the actuator cylinder fixed ends are connected with the actuator cylinder bases, the actuator cylinder loading ends are connected with the variable-torque pull rod loading connector, and the other end of the variable-torque pull rod loading connector is fixed to a helicopter moving ring supporting arm; the torsion arm loading fork lug assembly is connected with a helicopter movable ring 2 # torsion arm, one end of the anti-torsion fork lug assembly is connected with a helicopter movable ring 1 # torsion arm, and the other end of the anti-torsion fork lug assembly is connected with the anti-torsion rod assembly; the torsion arm loading fork lug assembly and the anti-torsion bar assembly are fixed to the ground rail through the torsion arm loading support.

The invention relates to the technical field of sampling detection, in particular to a reaction kettle full-automatic hanging bottle type online sampling device which is provided with a sampling hanging bottle, a sampling box, a pre-sampling unit, an information monitoring unit, an online analysis unit and a sampling execution unit. The information monitoring unit is used for acquiring the stress value of the sampling hanging bottle in the sinking process of the reactant, a real-time stress value curve is drawn, and the online analysis unit is used for judging whether the reactant has a local enrichment phenomenon or not and determining the sampling position of the sampling hanging bottle for sampling. The lifting motor is controlled by the sampling execution unit to drive the sampling hanging bottle to sink to the sampling position for sampling, and the standing time of the sampling hanging bottle at the sampling position is adjusted, so that the sampling position of closed sampling is adaptively adjusted according to the component distribution state of reactants in the reaction kettle, and the sample data representativeness of sampling detection is improved.

The invention discloses a calculation task distribution method and system, electronic equipment, a medium and a product, and relates to the technical field of artificial intelligence calculation and hardware architecture, the calculation task distribution method and system are applied to a calculation task distribution system, the calculation task distribution system comprises an equipment abstraction layer and all equipment, and the equipment abstraction layer comprises standardized interfaces of all the equipment. Comprising the following steps: when a new device is accessed, distributing a calculation task through a device abstraction layer, if the resource load of the new device exceeds the limit, screening idle devices with low resource load, selecting a target device with high overlap ratio with a hardware resource unit of the new device and highest matching degree with the calculation task from the idle devices, migrating the calculation task to the target device, and transferring the target device to the new device. And matching the instruction set. The technical problem that calculation task allocation is not intelligent is solved.

The utility model discloses a stacking angle measuring device capable of being used for loose materials in the field of physical property measurement of materials, which comprises a base plate support, a base plate fixing device, a base plate, a funnel neck support, a funnel and a surrounding shooting device, and the base plate fixing device is arranged on a base plate fixing device guide rail on the upper surface of the base plate support. The four base plate fixing devices jointly and horizontally support and position a circular base plate, a vertical fixed supporting rod, a height-adjustable vertical movable supporting rod, a horizontal supporting rod and a circular tube clamping device are sequentially connected to the tail end of one side of the base plate support, a funnel neck is fixed in the circular tube clamping device, and a surrounding shooting device is fixed to the upper surface of the base plate support. The diameter of the base plate and the height and the position of the funnel opening can be adjusted, the range of the grain size and the stacking angle of the material capable of being measured is wide, convenient and accurate measurement is achieved, the problem that partial laboratory stacking angle measuring devices can only measure powder is solved, and scientific data acquisition can be achieved through the surrounding shooting device.

The utility model discloses a helical tooth type anti-jumping stir-frying mechanism and a cooking machine. The helical tooth type anti-jumping stir-frying mechanism comprises a main stirring shovel, a side wall scraping shovel and a driving mechanism, the driving mechanism comprises a driving motor, a driving gear connected with an output shaft of the driving motor and a driven gear; an output shaft of the driving motor is in transmission connection with a rotating seat; the driving gear and the driven gear are meshed on the rotating seat; the main stirring shovel is in transmission connection with the driven gear through a main stirring connecting rod; the side wall scraping shovel is connected with the rotating seat through a side stirring connecting rod; a stirring included angle smaller than 30 degrees is formed between the central axis of the main stirring connecting rod and the vertical direction; through inclined revolution of the main stirring connecting rod, the distribution of rotating force of the main stirring connecting rod and the side stirring connecting rod is more balanced, and the rotating stability of the stir-frying mechanism is improved; and the problems of jumping of a machine table and the like caused by shaking due to contact collision among the main stirring shovel, the side wall scraping shovel and the frying pan due to unstable rotation caused by unbalanced distribution of force are reduced or avoided.

The utility model discloses a waste heat utilization energy-saving hearth which comprises a hearth body, a first limiting base is installed at the bottom of an inner cavity of the hearth body, a reflecting piece capable of sliding up and down is arranged outside the first limiting base in a sleeved mode, the reflecting piece slides up and down through a lifting assembly, and the lifting assembly comprises a first connecting base, a first bolt, a sliding rod and a second connecting base. The reflecting piece is symmetrically provided with two groups of first connecting seats, one group of first connecting seats is in threaded connection with a first bolt, the other group of first connecting seats is in sliding connection with a sliding rod, and the first bolt and the sliding rod are respectively and rotatably connected with a second connecting seat arranged in an inner cavity of a hearth. When the first bolt is rotated, the first connecting base in threaded connection with the first bolt is driven, namely the reflecting piece is driven to rise along the sliding rod, so that the reflecting piece can slide and rise along the first limiting base, the height of the reflecting piece is adjusted, the depth of the hearth is adjusted, and the requirements of different scenes are met conveniently.

The present invention discloses a floating welding fixture, including an outer shell, an inner shell, and a mandrel. The outer shell and the inner shell are both columnar covers with an opening at the top of the upper end. The inner shell is arranged inside the outer shell, and the mandrel is arranged inside the inner shell. A ball head is arranged on the top of the mandrel. A plurality of concave holes are symmetrically arranged on the horizontal outer side of the center of the ball head. Balls are arranged in the concave holes. The outer edges of the balls abut against the inner side wall of the inner shell. A plurality of centering spring pins connected with the inner shell are symmetrically arranged on the circumference at the lower end of the inner shell. The centering spring pins penetrate the inner shell body and abut against the outer circumference of the mandrel. A welding fixture is concentrically arranged inside the mandrel. The present invention has a novel structure, can make the position of the axis of the welded part and the welded part overlap highly, effectively eliminate the influence of the accumulated errors of parts manufacturing, tooling, and equipment on assembly, and improve the welding efficiency and qualified rate of products.

The application relates to a multi-aperture imaging space remote sensing target positioning optical system and a calibration method, and relates to the field of remote sensing and aerospace imaging optical instruments. The application solves the contradiction between the requirements of a large field of view and high resolution imaging of a traditional single-aperture optical imaging system, and realizes accurate positioning of a target to meet the intelligent requirements of a multi-aperture optical imaging system. The multi-aperture imaging space remote sensing target positioning sub-aperture imaging optical system comprises an electromagnetic vibration mirror, a beam-reducing telescope group, a fast reflection mirror and a rear focusing mirror group. The beam-reducing telescope group and the rear focusing mirror group are connected through the fast reflection mirror, and the light beam is connected with an imaging branch through the electromagnetic vibration mirror. After the imaging light beam passes through the telescope system, the imaging light beam is reflected by the fast reflection mirror and focused on a detector to form an image. The application is also suitable for a mobile platform for fast positioning and high-precision capturing of a dynamic target in the field of industrial precision machining and space remote sensing.

An electromagnetic flowmeter comprises a shell, two symmetrical electrode holders are arranged on the outer wall of the shell, detection electrodes are fixedly arranged in the electrode holders, and a left half mold and a right half mold are inserted into the two ends of the shell correspondingly; a mold closing seam of the left half mold and the right half mold is located on a plane where the two detection electrodes are located, and grooves are formed in the positions, corresponding to the detection electrodes, of the left half mold and the right half mold; before injection molding is started, the left half mold and the right half mold are closed, the end of the detection electrode is inserted into a hemisphere formed by the two grooves, a material used for forming a lining is injected into an injection molding cavity between the shell and the left half mold and the right half mold, demolding is conducted after cooling, and redundant materials formed at the end of the detection electrode are removed. The electromagnetic flowmeter has the effect of avoiding lining damage caused by punching in the production process of the electromagnetic flowmeter.

The invention discloses a preparation method of a carrier plate structure, the carrier plate structure and a semiconductor packaging structure. The preparation method of the support plate structure comprises the following steps: providing a support plate, wherein the support plate is provided with a first surface and a second surface opposite to each other in a first direction; modifying the support plate at a part of positions by using a laser induction process from one side of the support plate in the first direction, so that the support plate is provided with a modified area and a non-modified area, and the sizes of the modified area and the non-modified area in the first direction are equal to the size of the support plate in the first direction; performing etching treatment on the first surface in the modification area to form a first hole section which does not penetrate through the carrier plate; preparing a first conductive structure in the first hole section; performing etching treatment on the second surface in the modification area to form a second hole section communicated with the first hole section; and at least preparing a second conductive structure electrically connected with the first conductive structure into the second hole section.

This invention discloses a portable sediment sampler with a multifunctional collection structure for shallow sea use. It includes a connecting cylinder with a T-shaped operating handle fixedly connected to its top. A connecting layer column is movably installed at the bottom of the connecting cylinder, and a sampling mechanism is fixedly installed at the bottom of the connecting layer column. The sampling mechanism comprises a vertical cylinder, a compression spring, a sediment sampling cylinder, a first slot, a second slot, and a folded cylindrical plate. The sampling mechanism also includes a sealing cylinder, a threaded ring, a filter cotton sheet, and a filter plate. This sampler can simultaneously sample seabed sediment and seabed water, and can separate the sediment from the seabed water. During use, the sampler can be fixed to the side plate of a small fishing boat using an N-type mounting bracket, an adjusting rod, and a pressure disc. Furthermore, during the deep-sea sampling process, the support mechanism effectively prevents the sampling mechanism from tilting. The sampler also has an anti-loss function.

The invention discloses a folding mechanism, foldable electronic equipment and accessories thereof. The folding mechanism comprises a base frame assembly, a connecting rod assembly, a supporting assembly and a rotating assembly. One end of the connecting rod assembly is rotationally connected with the base frame assembly. The supporting assembly is rotationally connected with the other end of the connecting rod assembly. The rotating assembly comprises a rotating piece, the rotating piece comprises a first connecting body in sliding connection with the supporting assembly and a second connecting body in rotating connection with the base frame assembly, and the first connecting body comprises a first side and a second side opposite to the first side. The first side is provided with a first guiding part in sliding connection with the supporting assembly and a rotating part in rotating connection with the connecting rod assembly, the rotating part is arranged between the first guiding part and the second connecting body, and the second side further comprises a second guiding part in sliding connection with the supporting assembly. The matching length of the second guide part and the supporting assembly is larger than the matching length of the first guide part and the supporting assembly. The folding mechanism is not prone to shaking, and the use experience can be improved.

The application relates to the technical field of electric digital data processing, and particularly discloses a product information risk assessment method and system based on a large model, which comprises the following steps: simultaneously scanning source code and products by a scanner to generate a source dependency list and a product component list, performing main name normalization and alignment through a large model, locking a warehouse and a version according to the source dependency list, analyzing original code by a parser to generate a cross-language path logic group, combining the product component list to correct a real package version, converging into a unified intermediate representation, performing reachability and joint analysis on the unified intermediate representation to obtain a risk candidate path set and complete path scoring, finally, according to a preset weight and a running period evidence, modifying the score, screening out a risk path, matching a disposal strategy, and generating executable strategy code by the large model for risk control of a gateway or a service side.

The horn assembly comprises a main horn and an auxiliary horn, the main horn is provided with an upper seat plate and a lower seat plate, a left horn part and a right horn part are connected between the lower seat plate and the upper seat plate, the left horn part is provided with a big-end-up left sound inlet channel, and the right horn part is provided with a big-end-up right sound inlet channel. The upper seat plate is provided with a left sound outlet communicated with the left sound inlet channel and a right sound outlet communicated with the right sound inlet channel, the lower seat plate is provided with a left sound inlet communicated with the left sound inlet channel and a right sound inlet communicated with the right sound inlet channel, and the lower side of the lower seat plate is connected with a first sound production element facing the left sound inlet and the right sound inlet. The auxiliary horn is located between the left horn part and the right horn part, the top of the auxiliary horn is connected to the upper seat plate, the auxiliary horn is provided with a middle sound inlet channel, the bottom of the auxiliary horn is connected with a second sound production element facing the lower port of the middle sound inlet channel, the upper seat plate is provided with a middle sound outlet communicated with the middle sound inlet channel, and the horn assembly is compact in structure and good in sound production effect.

The invention relates to the technical field of dosing devices, and discloses a radial dosing device for anorectal surgery and a using method thereof.The dosing device comprises a medicine injection barrel, a dosing pipe is fixed in the medicine injection barrel, a plurality of first round holes are formed in the circumferential surface of the medicine injection barrel, a plurality of medicine outlets distributed at equal intervals are formed in the dosing pipe, and the first round holes are communicated with the first round holes. A first round hole is formed in the medicine injection barrel, a first nozzle is arranged in the first round hole, the first nozzle is connected to the medicine outlet in a sliding mode, a sealing barrel is connected to the medicine injection barrel in a sliding mode, one end of the sealing barrel is elastically connected with the medicine injection barrel through a first spring, and a plurality of second round holes are formed in the sealing barrel; the first nozzle can spray liquid medicine conveniently when working, the situation that the first nozzle is blocked by foreign matter and the spraying effect is affected is avoided, a gap between the medicine injection cylinder and the surface of the intestinal tract can be increased after the first expansion ring and the second expansion ring expand, the liquid medicine sprayed by the first nozzle can be distributed on the surface of the anorectal tract, and the medicine applying effect is improved.

The invention relates to the technical field of silicon rod grinding, in particular to a square silicon rod positioning adjusting device and method. The square silicon rod positioning adjusting device comprises a lifting table, a fine adjustment lifting assembly and a supporting plate; one end of the supporting plate is hinged to the lifting table along the axis in the front-back direction. The square silicon rod grinding device has the advantages that in the grinding process of a square silicon rod, when it is detected that the grinding allowance of the front end or the rear end of the square silicon rod is insufficient, the square silicon rod is placed on the supporting plate again, and the square silicon rod is placed on the supporting plate again; and the lifting end of the fine adjustment lifting assembly is controlled to drive the supporting plate to ascend or descend to calculate the distance value, so that when the square silicon rod is clamped by the clamp again and ground, the square silicon rod has enough grinding allowance, the machining precision of the square silicon rod during grinding is improved, and the grinding requirement is met.

The invention relates to the technical field of thermal control multi-layer machining, in particular to spacecraft thermal control multi-layer tailoring integrated equipment which comprises a tailoring device, a control device, a bearing device, a quilting device, a conveying device, a storage device and a storage cover, the tailoring device is fixed to an equipment shell through a fixing column, and a tailoring sliding rail is arranged on one side of the tailoring device; a lifting device is arranged on one side of the cutting device, a first motor and a lead screw are arranged on the lifting device, a cutting sliding rail is connected to the lead screw, a moving module is arranged in the cutting sliding rail, a cutter is connected to the lower portion of the moving module, and a pushing rod is arranged below the cutting sliding rail. According to the thermal insulation material cutting device, the cutting device is driven by the motor and the lead screw to do lifting motion, the cutting sliding rail drives the cutting knife to freely move in the plane, and therefore thermal insulation materials are cut.

The utility model relates to a transmission structure of a wet-type rod mill. The transmission structure comprises an output motor, a coupler, a pinion device, a bull gear and a barrel body, flanges are arranged at the two axial ends of the barrel, and the large gear is installed at the axial inner end of the flange on one side. The output motor is a permanent magnet motor and is installed on a motor base on the side of the barrel, the coupler is an elastic pin coupler, an output shaft of the permanent magnet motor is connected with the small gear device through the elastic pin coupler, the small gear device at least comprises a small gear meshed with the large gear, and the small gear is meshed with the large gear. The permanent magnet motor can drive the small gear to rotate to drive the large gear and the barrel to rotate. The permanent magnet motor and the elastic pin coupling are adopted to provide torque to drive the rod mill barrel to rotate, power consumption is remarkably reduced, high-inertia load generated when the rod mill is started is easily overcome, impact load and instantaneous vibration of the rod mill barrel are absorbed through the elastic pin coupling, a motor shaft and a transmission system are protected, and the service life of the rod mill is prolonged. The motor bearing life is prolonged.

The utility model discloses a high-strength G-level heavy-load gear-shifting gear, which relates to the technical field of tricycle gear-shifting gears, and has the technical scheme that the high-strength G-level heavy-load gear-shifting gear comprises a gear-shifting gear mechanism formed by meshing a plurality of groups of gears, bearings for supporting the gears are mounted on the plurality of groups of gears, and each of the plurality of groups of gears consists of a gear sleeve and a gear body, the gear sleeve is nested on the gear body, and the gear sleeve and the gear body are of a detachable structure. According to the gear-shifting gear, the combined structure of the gear sleeve and the gear body is adopted, the corresponding gear sleeve can be replaced according to the damage degree of the gear sleeve and the application condition of the gear, the gear does not need to be integrally replaced, the replacement cost is saved, meanwhile, the functionality of the gear is effectively enhanced, and the application range of the gear is effectively widened. Meanwhile, the tooth marks are of a rotation angle structure, the contact area between the gears during meshing can be effectively increased, meanwhile, the overlap ratio between the tooth marks is increased, noise is effectively reduced, and meanwhile the torque generated by gear transmission is improved.

The invention relates to the field of oxygenation pump speed reducers, and discloses a novel oxygenation pump speed reducer device with a sealing structure, which comprises a gear ring flange plate, a sun gear and a mounting bracket, a first planet carrier is arranged at the bottom of the gear ring flange plate in a surrounding manner, and three planet gears are arranged at the bottom of the first planet carrier; a gear ring is arranged at the bottom of the outer side of the gear ring flange plate, an inward-extending lubricating oil rod is arranged at the top of the gear ring in a penetrating mode, a sun gear is arranged on the inner sides of the three planetary gears, and a second planetary carrier is arranged at the bottom of the sun gear. According to the speed reducer device, precise lubrication of moving parts such as gears and bearings in the gear ring is achieved, lubricating oil can be evenly distributed on all the moving parts through the through holes and the oil outlet holes formed at equal intervals, friction and abrasion are effectively reduced, the operation efficiency of the speed reducer device is improved, and the service life of the speed reducer device is prolonged. According to the precise lubricating system of the device, the operation efficiency and stability of equipment are greatly improved.

The utility model relates to paper mounting technology field discloses an easily operated paper mounting positioning mechanism, including base, the top of base is provided with the slot, the inside of slot is provided with the placing plate, the bottom of placing plate is provided with two adjusting assemblies, be provided with two groups of clamping plates on the placing plate, the top of base is provided with two sliding slots, the inside sliding connection of two sliding slots has two positioning plates, one of positioning plates is fixedly embedded with magnet in the inside. The utility model discloses the setting of base, placing plate, clamping plate, positioning plate, limit board, positioning scale and bidirectional screw rod etc. structure can according to the size of the plank used when paper mounting, fixedly clamps and placing plate top center, can position the paper around after placing paper on the plank, improve the level of paper placement, and improve the coincidence of paper center and plank center, and then improve the quality of paper subsequent paper mounting.

This invention provides a continuous stepless adjustment device, method, and application for electron beam based on the axial position control of the convergence point, belonging to the field of electron optics adjustment technology. The invention includes an anode body, an anode aperture, an electromagnetic focusing unit, and a fixed single-aperture main aperture, coaxially arranged along the electron beam propagation direction within the lens barrel of an electron optics system. This invention uses the axial position of the electron beam's convergence point relative to the fixed single-aperture main aperture as the control degree of freedom. The electromagnetic focusing unit continuously adjusts the displacement of the convergence point along the optical axis, achieving continuous stepless adjustment of the electron beam. By completely eliminating the mechanical moving parts of the aperture, this invention not only achieves continuous and smooth adjustment of the electron beam but also fundamentally avoids the vibration, contamination, and failure risks caused by mechanical movement. This significantly improves the reliability, repeatability, and long-term stability of the electron optics system, while simplifying the system structure and reducing manufacturing and maintenance costs.

The utility model discloses a detachable injection mold base which comprises a first mounting plate, a movable mold is movably mounted on the inner side of the first mounting plate, a static mold is movably mounted on the inner side of a second mounting plate, and the movable mold and the static mold are connected with the first mounting plate and the second mounting plate through butt joint positioning mechanisms respectively. A telescopic discharging mechanism is slidably connected to the interior of the second mounting plate and the interior of the static mold, and ejector rods are fixedly mounted on the two sides of the first mounting plate. According to the detachable injection mold base, the movable mold and the static mold are fixedly connected with the first mounting plate and the second mounting plate through the butt-joint positioning mechanism, and the movable mold and the static mold can be conveniently positioned, connected and separated from the first mounting plate and the second mounting plate by controlling and operating the butt-joint positioning mechanism; and the movable mold and the static mold can be replaced according to injection molding requirements, and the use effect of the detachable injection mold base is improved.

The present invention discloses a positionable ultrasonic probe, wherein: the detection surface of the ultrasonic probe has an opening; above the opening, an imaging component is fixed inside the ultrasonic probe, which is used to obtain an image of the contact surface of the body of the person being measured when the ultrasonic probe is in use; an anti-bending light-transmitting gasket is fixed at the opening to completely cover the opening, which is used to prevent the coupling agent from flowing back when the ultrasonic probe is in use, and to ensure the smoothness of the probe detection surface; it includes an image processing module, which calculates the horizontal and vertical displacement of the ultrasonic probe by analyzing and comparing the image sequence obtained by the imaging component within a certain period of time. The imaging component includes: ① an imaging element and a light-emitting element based on optical principles; ② a thermal imaging component based on thermal principles.

The invention discloses a focusing objective lens and a processing head of a dual-band micro-jet laser device, belonging to the field of micro-jet laser devices. The focusing objective lens is applied to the processing head of the dual-band micro-jet laser device, the processing head comprises a water cavity and a nozzle, the nozzle comprises a nozzle hole, the focusing objective lens, the water cavity and the nozzle are arranged in sequence along the optical axis direction of the focusing objective lens, the focusing objective lens is used to focus a dual-band light beam into the water cavity and the nozzle hole, the focusing objective lens comprises a biconcave negative lens group, a biconvex positive lens group and a meniscus positive lens group which are coaxially arranged in sequence; the dual-band light beam enters the biconvex positive lens group after being diverged by the biconcave negative lens group, enters the meniscus positive lens group after being converged by the biconvex positive lens group, passes through the water cavity and enters the nozzle hole after being converged by the meniscus positive lens group, thereby improving the processing quality and processing efficiency of laser processing.

The utility model discloses a grid for preventing foreign matters from invading into a subway ventilation opening, and relates to the field of subway facilities, in particular to the grid for preventing the foreign matters from invading into the subway ventilation opening, which comprises a grid body arranged on the subway ventilation opening, the body consists of an upper frame and a lower frame, and a protection assembly for preventing the foreign matters from invading into the grid body is arranged on the body. The protective assembly comprises a first partition plate installed in the upper frame and a plurality of second partition plates installed in the lower frame, and the first partition plates and the second partition plates are alternately arranged on the projection face in the air inlet direction in a staggered mode. Foreign matters are easy to accumulate on the grating, so that the problem that the foreign matters enter a subway after long-term use still occurs.

The fine adjustment device comprises an adjusting support, a first low-beam lens and a second low-beam lens are connected to the adjusting support in an inserted mode, and the first low-beam lens comprises a first lens support. First protruding shafts in the horizontal direction are arranged on the two sides of the first lens support, the first low beam lens can rotate with the straight line where the two first protruding shafts are located as a rotating shaft, and a first adjusting protruding shaft in the vertical direction is arranged on the top face of the first lens support. The second low-beam lens comprises a second lens support, second protruding shafts in the horizontal direction are arranged on the two sides of the second lens support, the second low-beam lens can rotate with the straight line where the two second protruding shafts are located as the rotating shaft, and a second adjusting protruding shaft in the vertical direction is arranged on the top face of the second lens support. According to the device, the two low-beam lenses can be rotated and finely adjusted, so that cut-off lines of the two low-beam lenses coincide, the phenomenon of transverse fault is avoided, interference to sight lines of vehicles and pedestrians in the opposite direction is reduced, and accidents are reduced.

A steel box girder segment comprises a top plate, a top plate connecting plate and a web plate, a top plate connecting plate connecting hole is formed in the top plate connecting plate, a web plate connecting hole is formed in the web plate, and the three-way angle type tool comprises a top plate bolting plate, a top plate connecting plate bolting plate and a web plate bolting plate. Any two of the two connecting rods are perpendicular to each other and are welded together respectively. A first bolting hole is formed in the top plate connecting plate bolting plate; second bolting holes which are distributed in rows and columns are formed in the top plate bolting plate; third bolting holes are formed in the positions, corresponding to the web connecting holes, of the web bolting plate. According to the three-way angle type tool, a standard right-angle geometrical relationship can be endowed to the top plate, the web plate and the top plate connecting plate of the steel box girder in a forced mode, so that the spatial position of the intersection point of the three plates can be locked in advance in the assembling stage of a steel box girder section, and it is ensured that the topological relationship of all the plates in a complex three-dimensional space is consistent with the height of a design model.