567results about How to "Adjustable size" patented technology

The invention relates to a light path system for forming point ring light spots and a laser processing device. The light path system comprises a first light source, a first collimating lens, a first conical lens and a reflecting mirror which are arranged in the first linear direction. The second light source, the second collimating lens, the focusing lens and the second conical lens are arranged in the second linear direction, the reflecting mirror is located between the second collimating lens and the focusing lens, and the center of the reflecting mirror and the center of the second conical lens are each provided with a through hole allowing a second light beam emitted by the second light source to penetrate through; a first light beam emitted by the first light source passes through the first collimating lens and the first conical lens and then is reflected by the reflector, and the reflected first light beam sequentially passes through the focus lens and the second conical lens and then forms an annular light spot at the focus of the focus lens. A second light beam emitted by the second light source sequentially passes through the second collimating lens and the focus lens and then forms a point light spot located in the center of the annular light spot at the focus of the focus lens. The composite light spot of the center point light spot and the outer ring light spot can be formed, the structure is simple, and the manufacturing cost is low.

The invention provides a horizontal sliding bearing test bed, which belongs to the field of sliding bearing safety operation and detection and comprises a main transmission system, a driving system, a radial loading system, a heating system and a hydraulic system. A sliding bearing seat in the radial loading system is inversely fixed on a lower loading plate and is detachably sleeved and fixed on a test bearing, and a test bed applies pressure to the lower loading plate through a hydraulic cylinder to apply radial load to a test sliding bearing. A rotary swing hydraulic oil cylinder in the main transmission system provides power to test the horizontal sliding bearing. The hydraulic system is connected with the rotary swing hydraulic oil cylinder and the radial loading oil cylinder and can achieve closed-loop control over torque and radial loading force. The heating system simulates a high-temperature working condition through a heating box, and a test bearing can be set to be tested at a specific high temperature. According to the invention, large load detection can be realized, working condition simulation is accurate, data such as bearing working torque and service life can be detected, and comprehensive and multi-size adaptability is realized.

The invention provides an in-hole large-diameter main drive disassembling device and disassembling method, and relates to the field of shield tunneling machines, the in-hole large-diameter main drive disassembling device comprises a base platform with an upper platform and a lower platform, the lower platform is provided with a sliding block, the sliding block slides in the length direction of the lower platform, and the upper platform is provided with two bearing holes; the connecting assembly comprises a first connecting element, a second connecting element and third connecting elements, the first connecting element and the second connecting element are used for being fixed to the main drive, the two third connecting elements are fixed to the upper platform in the width direction, and the third connecting elements are hinged to the second connecting element; the disassembling assembly comprises a first telescopic element and a second telescopic element, the first telescopic element is connected with the first connecting element and the sliding block, and the second telescopic element is hinged to the sliding block; the supporting assembly is located below the bearing hole. According to the disassembling device, the first telescopic element and the second telescopic element are matched, so that the disassembling device can select elements with smaller lengths and strokes, the size of the disassembling device is smaller, and the disassembling device is more suitable for disassembling the main drive in a hole.

The invention belongs to the technical field of atomizing water spraying, and discloses atomizing water spraying equipment for municipal construction, which comprises a base, a water tank is fixedly connected to one side of the upper surface of the base, a fixing frame is fixedly connected to the upper surface of the base, and a water pump located on one side of the fixing frame is fixedly connected to the upper surface of the base. A movable plate movably sleeves the inner side of the bottom of the fixed frame, a hydraulic oil pump movably sleeves the outer circular surface of the convex part of the movable plate, a shell movably sleeves the middle part of an output shaft of the hydraulic oil pump, and two rotating rods movably sleeve the inner side of the convex part of the upper part of the fixed frame. By means of the design of the pressurizing mechanism, airflow generated by the fan blades is enhanced, by optimizing the airflow path and reducing energy loss, the effect of obtaining larger wind power under the same power can be achieved, energy is saved, the operation cost is reduced, water mist can be conveyed to a farther distance through the stronger wind power, the water mist can be atomized more sufficiently, and the water mist atomization effect is improved. Therefore, the dust falling efficiency is improved.

The invention discloses a continuous and efficient insulating glove voltage withstanding detection device and a detection method thereof, belongs to the field of insulating glove detection, and solves the problem that the knuckle part of an existing insulating glove cannot be detected during voltage withstanding detection, and the device comprises a supporting seat, a conveying assembly, a lifting storage barrel and a detector, according to the insulation glove detection device, through arrangement of the detection mechanism and the detector, a conductive detection rod can be stably inserted into the insulation glove, and along with operation of the lifting assembly, the distance between the lifting sliding cylinder and the mounting piece is gradually reduced; at the moment, the conductive detection piece automatically slides down to the lower end under the action of self weight and gravity to fill the internal space of the insulating glove, especially the knuckle part of the insulating glove, so that the detection area during equipment operation is enlarged, the equipment can comprehensively carry out withstand voltage detection on the insulating glove, and the detection efficiency is improved. And the accuracy and the stability of detection data are ensured.

The invention discloses a liquid metal-hydrogel composite radiation protection material and a preparation method and application thereof.The preparation method comprises the steps that indium, tin and bismuth are sequentially put into a flask from low melting point to high melting point to be mixed, and glycerin is added for immersion; placing the mixture in an argon atmosphere, and stirring by using a heating type magnetic stirrer; taking out the spherical liquid metal particles from the glycerol, and finally washing and drying to obtain liquid metal alloy particles; preparing a PVA (polyvinyl alcohol)-H2O solution with the mass fraction of 15% and a PVA-DMSO (dimethyl sulfoxide) solution with the mass fraction of 15%; and a PVA-H2O solution, a PVA-DMSO solution and the liquid metal alloy particles are stirred and mixed according to the mass ratio, the mixed solution is subjected to ultrasonic treatment and then poured into a mold to be frozen into gel, and the liquid metal-hydrogel composite material is obtained. By combining the advantages of the liquid metal and the hydrogel, excellent biocompatibility, adjustable mechanical property and efficient radiation shielding capability are realized, and the hydrogel can be used as a novel lead-free radiation protection material.

The utility model discloses an adjustable jaw crusher for construction waste, which comprises a frame, a fixed jaw plate arranged on one side of the frame and a flywheel arranged above the frame, a movable jaw is arranged on one side of the frame, a movable jaw plate is arranged between the movable jaw and the fixed jaw plate, a clamping groove is arranged on the movable jaw, and the flywheel is arranged on the frame. The movable jaw plate is connected to the movable jaw in a clamped mode, a connecting plate is arranged above the rack, a limiting groove is formed in the rack, the connecting plate is connected to the interior of the limiting groove in the rack in a limited mode, an adjusting plate is arranged on one side of the connecting plate, and a hydraulic telescopic rod is arranged between the adjusting plate and the movable jaw. One end of the hydraulic telescopic rod is fixedly connected to the adjusting plate, and a limiting seat is arranged below the movable jaw and fixedly connected to the movable jaw. The size of the opening of the crushing cavity of the stone crusher is adjusted through connection between the hydraulic telescopic rod and the spring, the exerting space of the jaw crusher is widened, and the crushing efficiency of the crusher is improved.

The invention discloses electromagnetic shielding aerogel with a double-layer structure and a preparation method of the electromagnetic shielding aerogel, the electromagnetic shielding aerogel is composed of cellulose nanofibers, hollow cobalt nickel carbon nanocages and few-layer MXene, and the electromagnetic shielding aerogel is of the double-layer structure. The electromagnetic shielding aerogel not only has excellent kilomegahertz shielding efficiency with low reflection characteristic, but also has great application potential in the fields of lightweight multifunctional electromagnetic shielding composite materials, special electromagnetic protection facilities, electromagnetic stealth materials, severe environment resistant electronic equipment and the like.

The utility model discloses a terminal crimping machine convenient for auxiliary spacing, and relates to the terminal crimping machine technology field, the terminal crimping machine comprises a machine body and a clamping block, the bottom of the machine body is provided with a hydraulic rod, the bottom of the hydraulic rod is provided with a pressing block, the bottom of the pressing block is provided with a fixing block, the bottom of the fixing block is fixedly connected with a base plate, and the base plate is fixedly connected with the clamping block. A discharging box is fixedly connected to the top of the bottom plate, and an electric push rod is arranged on one side of the discharging box. According to the terminal crimping machine facilitating auxiliary limiting, a conical positioning block at the top of a pressing block is in butt joint with a conical groove in the bottom of a connecting plate, the conical structure can facilitate butt joint of the conical positioning block and the conical groove, when the positioning block makes contact with an inclined face on one side of a clamping block, the clamping block moves, and when the clamping block moves, a first spring on one side is squeezed; and when the clamping block makes contact with a clamping groove in the positioning block, the first spring can reset, the clamping block is pushed to move to be clamped with the positioning block, and limiting installation of the pressing block is completed.

The invention discloses a preparation method of a carbon fiber cloth coated SixFe1-xO2 nanorod material, which comprises the following steps: dissolving a silicon source and an iron source in a mixed solution of ethanol and ethylene glycol, adding hexamethylenetetramine and urea step by step, stirring and dissolving to obtain a mixed solution, then putting the mixed solution and carbon fiber cloth into a high-pressure reaction kettle together, and stirring for 30-60 minutes to obtain the carbon fiber cloth coated SixFe1-xO2 nanorod material. The preparation method comprises the following steps: adding a carbon fiber cloth coated SixFe1-x (OH) 4 nanorod material into a reaction kettle, reacting at a certain temperature in a constant-temperature drying box, then naturally cooling to room temperature, washing and drying to obtain the carbon fiber cloth coated SixFe1-x (OH) 4 nanorod material, putting the carbon fiber cloth coated SixFe1-x (OH) 4 nanorod material into a muffle furnace, and annealing in an air environment to obtain the carbon fiber cloth coated SixFe1 The synthesis process is simple, the cost is low, the requirement for equipment is low, the controllable degree is high, and the obtained product is uniform and novel in morphology, has high charging and discharging capacity and long cycle life as a flexible negative electrode material, and has wide application in the fields of flexible batteries, photoelectric devices and the like.

The invention provides a pipe fitting punch forming device with a protection structure and a forming process, and belongs to the technical field of pipe fitting machining.The pipe fitting punch forming device with the protection structure comprises a supporting plate, a supporting seat is fixedly arranged on the supporting plate, a shell is installed on the supporting seat, a support is welded to the shell, and a protective cover is arranged on the supporting seat; a first electric push rod is installed on the support, a connecting block is connected to the bottom of the first electric push rod, a fixing plate is fixedly arranged on the connecting block, a rotating ring is rotationally connected to the rear side of the fixing plate, a fixing ring is fixedly installed in the fixing plate, a driving assembly is installed on the fixing ring, and a pressing plate is fixedly connected to the rotating ring. The pipe fitting stamping device solves the problems that an existing pipe fitting stamping device cannot support a round pipe while stamping the round pipe into a square pipe, cannot adjust the size of the pipe after stamping forming and cannot detect the size, and does not have a protection function during stamping.

The utility model belongs to the technical field of medical instruments, and discloses a bone marrow collection device capable of quantitatively sucking, which comprises a storage bin, a suction tube, a suction tube, a suction tube, a suction tube and a suction tube, and is characterized in that the storage bin takes the shape of a hollow cylindrical shell and is used for storing collected bone marrow; the needle head and the storage bin are coaxially arranged, and the end, away from the needle tip, of the needle head extends into the storage cavity; the piston is slidably connected into the storage bin, the peripheral wall of the piston is tightly attached to the inner wall of the storage bin, a pair of push rods is fixed to the end, away from the needle head, of the piston, the other ends of the push rods penetrate through the storage bin and are slidably connected with the storage bin, and the ends, away from the piston, of the push rods are fixed to the push plate; the distance between the pull-back push plate, the push rod and the piston during bone marrow extraction is controlled by controlling and adjusting the distance between the pressing plate and the storage bin, then the amount of the extracted bone marrow is controlled, the purpose of quantitatively collecting the bone marrow is achieved, and the quantitative collection amount can be adjusted.

The utility model belongs to the technical field of damping vibration attenuation, and particularly relates to a viscous damper structure which comprises a damping cylinder body, a viscoelastic damping body is arranged at the top of the damping cylinder body in a sealing mode, a viscous damping body is filled in the damping cylinder body, and a movable shaft body penetrates through the middle of the viscoelastic damping body. One end of the movable shaft body extends into the viscous damping body and is provided with a movable terminal; the movable shaft body is of a hollow structure and is internally provided with an adjusting shaft, one end of the adjusting shaft is provided with an adjusting disc abutting against the movable terminal, and the movable terminal and the adjusting disc are provided with damping adjusting holes which are aligned in a one-to-one mode. The viscoelastic damping body is made of a pouring type high-damping material, has excellent vibration reduction characteristic, waterproof performance and sealing characteristic and basically has no additional rigidity, and the viscous damping body is made of a liquid type high-damping material, and is excellent in damping function and simple in structure; and meanwhile, the size of the damping adjusting hole in the movable terminal can be adjusted by rotating the adjusting disc, so that the purpose of adjusting the damping is achieved.

The invention discloses a rotary desert automatic planting tracked robot and a working process thereof. The robot comprises a frame, and a cavity is formed in the center of the frame; the driving mechanism is fixedly connected to the lower part of the frame; the trepanning mechanism is fixed to the edge of the vehicle frame, and a drill bit is located outside the vehicle frame and can move downwards till making contact with the ground; the front support is located at the position, close to the punching mechanism, above the frame; the central bracket is positioned above the central hole of the frame; the seedling feeding mechanism is fixed above the front bracket; the seedling planting mechanism is composed of a ball screw and a funnel type seedling planter. The ball screw is fixed to the upper portion of the central support, the lower portion of the ball screw is connected with the sliding block, and the funnel-shaped seedling planter is located under the ball screw. The two earth ramming mechanisms are symmetrically fixed to the positions, on the two sides of the central support, of the lower portion of the frame, and earth ramming pieces point to the seedling planting mechanism; and the irrigation and fertilization mechanism is fixed on the frame and is opposite to the cavity in the center of the frame of the front bracket. The robot can achieve the technical effects of being high in land adaptability, planting in different geologies, flexibly adapting to seedling stems of different lengths and diameters, and liberating manpower through automation in the whole seedling planting process.

The utility model discloses an extrusion device for instant noodles, which relates to the field of extrusion devices and comprises a conveying box, a conveying belt is mounted in the conveying box, a hopper is fixedly mounted at the back of the top end of the conveying box in a penetrating manner, and guide plates are fixedly mounted at the upper ends of the interiors of the front end and the rear end of the hopper. And material extruding rollers are movably installed in the conveying box and located below the two material guiding plates, a material cutting assembly is arranged right in front of the conveying box, an adjusting assembly is installed at the position, close to the front portion, of the top end of the conveying box, the material cutting assembly comprises two supports arranged in parallel, and two material cutting rollers are movably connected between the two supports through rotating shafts. The adjusting assembly is arranged to be matched with the cutting assembly, the thickness of extruded instant noodle materials can be conveniently controlled, meanwhile, the materials are ironed, and the situation that local defects occur after the materials are discharged, and consequently instant noodle lines are fractured in advance when the needed length is not reached in the subsequent cutting process is avoided; and the size of the instant noodle lines in the cutting process can be conveniently adjusted according to requirements.

The invention discloses a reactor cabin structure internal pressure-bending combined load test device and a test method thereof.The device comprises a test module, the test module comprises a test section, a first transition section and a second transition section, and the test section is provided with a first pressure cabin and a second pressure cabin; the internal pressure loading module comprises a water tank and a pressure pump; the bending loading module comprises a first vertical loading mechanism and a second vertical loading mechanism; the bottom supporting module comprises a first supporting mechanism and a second supporting mechanism; and the measuring module comprises a first pressure sensor, a second pressure sensor and a pressure gauge. According to the invention, the internal pressure loading module and the bending loading module are used for simulating the load of the pressure chamber structure under dual accident conditions, the structural response under the condition of superposition of different internal pressure loads and different bending loads is known, and the safety and reliability of a chamber section model of the pressure chamber structure under the accident conditions are analyzed.

The utility model belongs to the field of optical equipment, and particularly relates to an automatic opening and closing device for optical testing, the automatic opening and closing device comprises a shutter device provided with the automatic opening and closing device and a receiving lens, the automatic opening and closing device is arranged on a shutter base through a shutter support, the automatic opening and closing device is provided with a light through hole, and the receiving lens is arranged in the axis direction of the light through hole. The receiving lens is arranged on the lens base through the lens support, the automatic opening and closing device is provided with a shading blade, one end of the shading blade is rotationally connected with the mounting shell, the shading blade shields the light through hole when swinging, and the shading blade swings under the control of the transmission device. By arranging the swinging blades with the magnetic damping devices, swinging of the blades is achieved, so that slits for shading and light passing are automatically formed, and the sizes of the slits are adjusted.

The invention discloses a cable surface water removal device for high-voltage electric power overhaul, and relates to the field of cable surface water removal, a water removal part comprises a moving ring, an inner cavity of the moving ring is rotatably connected with a central rotating shaft, and an inner cavity of the central rotating shaft is fixedly connected with a driving rod; a water removal shell is fixedly connected to the end, away from the central rotating shaft, of the driving rod, and a replacement mechanism is fixedly connected to the side, away from the driving rod, of the water removal shell. The sponge is extruded by the extrusion rods on the two sides, so that water is discharged, meanwhile, the water pump extracts the extruded water, the extension rod extrudes towards the direction of the sponge, the water in the center of the sponge is treated, the water in the sponge is cleaned more thoroughly, drying agents are arranged in inner cavities of the extrusion rods, and air and the water on the surfaces of the extrusion rods are treated. The heater evaporates a portion of the moisture.

The utility model relates to a film blowing cooling device for plastic film production, which comprises a box body, the right side of the box body is fixedly connected with an air bellow, the inner bottom wall of the air bellow is fixedly provided with a fan, the inner part of the box body is rotatably connected with two wind-up rollers, the inner top wall of the box body is fixedly connected with an air outlet screen plate, and the air outlet screen plate is fixedly connected with a fan. A film blowing assembly is arranged on the box body, an adjusting assembly is arranged on the box body, and the film blowing assembly comprises a motor fixedly installed on the inner wall of the right side of the box body. According to the film blowing cooling device for plastic film production, by arranging the film blowing assembly, dust in outside air can be filtered through a dust screen in the film blowing cooling process for plastic film production, the situation that the dust is blown down to the surface of a plastic film is reduced, and a toothed plate is driven to move up and down in a reciprocating mode, so that the film blowing cooling effect is improved. And water drops or other impurities possibly attached to the surface of the plastic film are vibrated and cleaned by the push plate, so that the production efficiency of the plastic film is ensured.

The invention belongs to the technical field of medical instruments, and particularly relates to a scissor type interbody fusion cage which comprises a base and an upper supporting plate, the base is connected with the upper supporting plate through a scissor type jacking mechanism, and protruding teeth are arranged on the base and the upper supporting plate; the shear type jacking mechanism comprises a jacking block, a shaft rod, an arched top plate, a movable block and a push rod; a movable block is installed on the bottom face in the base, and the arched top plate is located between the movable block and the inner wall of the base. The upper end of the arched top plate is connected with the upper supporting plate; the fusion cage is simple in structure, the arched top plate and the movable block are combined into a relatively flat scissor type structure, the size of the fusion cage is further reduced, the fusion cage can be conveniently implanted and used, the thickness can be conveniently adjusted, meanwhile, the freedom degree of movable parts in the fusion cage is reduced and limited, and the stability of the fusion cage after the thickness is adjusted is guaranteed.

The invention relates to the technical field of quartz sand classified screening, in particular to a quartz sand classified crushing device. Comprising a base, a material conveying pipe and a screen drum; the sieve pore adjusting mechanism comprises a window and a sliding rod; the amplitude adjusting mechanism comprises a blanking hopper, a turntable and an eccentric rod; sieve holes are defined by the sieve plates and the sieve rings, so that the size of the sieve holes is adjustable, blockage is prevented, the grading and screening requirements of quartz sand are met, meanwhile, solid particles such as coal, ore and glass are compatible, the wear condition of the sieve plates is judged according to resistance values among the sieve plates, and the opening of the discharging opening and the sieve holes are increased during discharging, so that blockage is prevented; meanwhile, a circular truncated cone and a discharging hopper are matched for primary crushing and upward transportation through a scraper, and the situation that the particle size is too large and consequently the sieve hole abrasion efficiency is improved is avoided; the vibration amplitude of the conveying pipe is controlled to be increased through the amplitude adjusting rod, so that all the quartz sand blocks collide with one another and collide with the inner wall of the conveying pipe to be preliminarily crushed, the screening efficiency is improved, and blocking is further prevented.

The utility model belongs to the technical field of screen window processing, and particularly provides a semi-automatic screen window pressing machine which comprises a machine frame and is characterized in that a workbench is arranged on the surface of the machine frame, a guide rail frame is arranged at the upper end of the machine frame, a connecting sliding rail is arranged on one side of the guide rail frame and provided with an automatic pressing wheel piece, and the automatic pressing wheel piece is provided with a pressing wheel. The automatic wheel pressing part comprises a wheel pressing device main plate, a first guide rail is arranged on the front face of the wheel pressing device main plate, a first sliding block is arranged on the first guide rail in a sliding mode, and a lifting plate is arranged on one side of the first sliding block. The positioning accuracy of the screen window is improved by positioning the length and width of the screen window, so that the pressing accuracy of the automatic pressing wheel piece is improved, the probability of deviation of the screen window in pressing is reduced, the production efficiency is improved, the size and height of the pressing wheel can be adjusted by switching different pressing wheels, the application range is larger, production and use by a user are facilitated, and the practicability is high. The positions, difficult to press, of the corners of the screen window can be pressed through the manual pressing piece, and when the screen window clamped by the first clamp and the second clamp is manually pressed, the screen window can be accurately positioned, so that human errors are reduced.

The invention discloses a negative oxygen ion catalyzed SPC stone-plastic floor material and a preparation method and equipment thereof, and belongs to the technical field of stone-plastic floors, the negative oxygen ion catalyzed SPC stone-plastic floor material is prepared from polyvinyl chloride resin, ground calcium carbonate, nano titanium dioxide, tourmaline, nano magnesium oxide, a plasticizer, a lubricant, a surfactant and a stabilizer. According to preparation of the negative oxygen ion catalyzed SPC stone plastic floor material, porous anatase crystal type nano carbon dioxide particles doped with rare earth elements, tourmaline containing iron and manganese elements and nano magnesium oxide particles are added, so that the prepared negative oxygen ion catalyzed SPC stone plastic floor material has the function of releasing negative ions; the SPC stone-plastic flooring material has good air purification effect and good photocatalytic effect, overcomes the defects of low air purification effect and single function of the existing SPC stone-plastic flooring material, and is simple and feasible in preparation method and suitable for large-scale industrial production and application.

The invention provides an electroosmosis drainage test device, and belongs to the technical field of test devices. The device comprises a bearing bracket, a test box, a displacement measuring system and a control box, the control box comprises a current and voltage data acquisition module used for acquiring current and voltage information of an object to be tested and displaying the current and voltage information on a control panel through a current-voltage data display module; the gravity data acquisition module is used for measuring the gravity data of the electro-osmosis displacement of the to-be-tested article through a displacement measurement system and displaying the gravity data on the control panel through the gravity data display module; and the image display module is used for drawing a curve of current, voltage and displacement changing along with time under a constant voltage or constant current condition according to the collected current, voltage and gravity data. According to the invention, the data recording process is completely automatic, and the data recording can be completed without manual operation in the test process. And the influence of time difference of manual recording on a test result is reduced. And the test process can be known through the output curve.

The utility model discloses a sand prevention device for a cooling tower, which comprises a filter box, the inside of the filter box is hollow, a drain outlet is arranged on the surface of the front end of the filter box, a filter screen is arranged in the filter box, a cleaning device is arranged above the filter box, an adjusting pipe is arranged at the bottom end of the filter box, the surface of the adjusting pipe is rotatably connected with an outer gear ring, and the outer gear ring is rotatably connected with the filter box. An outer gear ring is arranged on the inner side of the adjusting pipe, an inner gear ring is arranged on the surface of the outer gear ring, the interior of the adjusting pipe is hollow, rotating shafts are arranged on the front side and the rear side of the interior of the adjusting pipe, and the rotating shafts are rotationally connected with the adjusting pipe.

The utility model relates to the technical field of machining equipment, and provides a clamping device and machining equipment, the clamping device comprises a base and at least two clamping arms, the at least two clamping arms are arranged on the base in a one-to-one correspondence and spaced mode in the first direction, the at least two clamping arms and the base jointly form an adjustable clamping space, and the clamping space is used for clamping a workpiece to be machined; the first end of the clamping arm is rotationally connected with the base, and the second end of the clamping arm is constructed to abut against the workpiece in the clamping space in the second direction; the second direction intersects the first direction. The clamping device can be used for clamping various workpieces with different specifications and sizes, operation is easy, and the machining efficiency is improved.

The invention discloses a preparation method of defective zirconium-based MOFs and application of the defective zirconium-based MOFs in separation and purification of astaxanthin, and belongs to the technical field of porous materials. The preparation method of the defective zirconium-based MOFs specifically comprises the following steps: dissolving ZrCl4 and a ligand 4, 4 '-diphenyldicarboxylic acid in N, N-dimethylformamide, then adding an acetic acid regulator, obtaining a crude product d-UiO-67-X through a solvothermal method, and carrying out washing, drying and vacuum heating activation on the crude product to obtain the defective zirconium-based metal organic framework material d-UiO-67-X. According to the method disclosed by the invention, the defect d-UiO-67-X is successfully constructed through a modifier-induced defect engineering strategy, and the sizes and chemical properties of pores can be adjusted and the adsorption separation performance of the astaxanthin can be enhanced by controlling the defects, so that the astaxanthin can be effectively and selectively separated from a complex matrix.

The adjustable powder feeding device for laser additive manufacturing comprises a powder storage barrel, a fixing block is fixed to the middle of the lower surface of the powder storage barrel, an indwelling hole penetrating through the upper surface and the lower surface of the middle of the fixing block is formed in the middle of the fixing block, and a second through hole corresponding to the indwelling hole is formed in the middle of the lower end of the powder storage barrel. A baffle is slidably installed in the middle of the interior of the fixing block in the horizontal direction, a powder conveying pump communicating with the first connecting cylinder is installed at the lower end of the first connecting cylinder, in the using process, the powder feeding amount can be adjusted according to the using requirement of external laser additive printing equipment, the powder feeding amount of the powder feeding device can be conveniently adjusted, and the powder feeding efficiency is improved. And therefore, the application range of the powder feeding device can be guaranteed, the laser additive printing processing effect of external laser additive printing equipment can be guaranteed, and the powder feeding device can be used conveniently.

The utility model provides a building template for supporting, which comprises a base, the base comprises a bottom plate and a supporting plate, the bottom plate is arranged in a mirroring manner, one end of the bottom plate is provided with a template assembly for pouring, the top surface of the bottom plate is provided with the supporting plate, and one end of the supporting plate deviating from the bottom plate is inclined and connected with the template assembly. A supporting mechanism used for supporting and reinforcing is arranged in the middle of the side, facing the combined assembly, of the formwork assembly, the combined assembly comprises stand columns and a combined rod, the stand columns are arranged at the two ends of the combined rod in a mirror image mode, the stand columns and the bottom plate are arranged correspondingly, and the side faces of the stand columns are fixedly connected with the supporting plate. The pouring formwork is arranged on the outer side of the mounting plate. According to the building template, the size of a pouring area formed by the pouring templates can be adjusted before the building template is poured through clamping and sliding of the pouring templates and the mounting plate in the template assembly, the purpose of changing the pouring effect is achieved, and then the building template can be conveniently suitable for more building designs.