91results about How to "Avoid swapping" patented technology

The invention discloses a concrete test block anti-counterfeiting system and an anti-counterfeiting method, and belongs to the technical field of concrete detection. Comprising an anti-counterfeiting designation card, and a sample preparation end and a laboratory end which communicate with a server and identify the anti-counterfeiting designation card, the anti-counterfeiting designation card comprises a substrate, an identification code and a direction mark which are arranged on the front surface of the substrate, and a bending pin for fixing the substrate, and the laboratory end carries out anti-counterfeiting verification by identifying the installation direction, angle and distance of the anti-counterfeiting designation card. According to the invention, the anti-counterfeiting security is obviously improved, the reliability is enhanced, the verification efficiency is improved, and the adaptability to the environment is improved; meanwhile, a laboratory and a supervision platform are accessed to realize connection and integration with an existing system; besides, the system is set according to the national building material management standard, is compatible with other quality control systems, is convenient to integrate into the existing management system, promotes the industrial standardization process, and reduces the implementation cost.

The invention relates to the technical field of image recognition, and discloses a multi-commodity automatic correction and recognition method and an intelligent self-service cash register, and the method comprises the steps: extracting a commodity front image from a commodity image; identifying label areas, and selecting associated feature points for each label area; segmenting a commodity area from the front image of the commodity; determining an associated commodity area of each label area; extracting a commodity side image, and determining an associated commodity area of each label area in the commodity side image; reconstructing a three-dimensional model of the commodity; scanning a label area to obtain commodity information, and verifying the commodity information based on a gravity sensor and the three-dimensional model of the commodity; according to the invention, the accuracy of commodity identification and the settlement efficiency are improved, the user experience is improved, the security and reliability of the system are enhanced, and a more efficient, convenient and reliable self-service cashier solution is provided.

The invention discloses a building external wall heat preservation structure easy to disassemble and assemble, and belongs to the technical field of building external wall heat preservation, the building external wall heat preservation structure easy to disassemble and assemble comprises a mounting plate, a heat preservation plate is mounted in the mounting plate, a setting assembly is arranged in the mounting plate, a locking and adjusting assembly is arranged at one end of the mounting plate, and a disassembly assisting assembly is arranged in the mounting plate; the peripheral side faces of the heat preservation plate are tightly pressed through expansion of the setting assemblies, so that the heat preservation plate is rapidly installed in the installation plate, meanwhile, a gap between the heat preservation plate and the installation plate is blocked, the construction efficiency is improved, the requirement for the size precision of the heat preservation plate is effectively lowered, and the construction cost is reduced. The expansion state of the setting assembly is locked through the arranged locking and adjusting assembly, meanwhile, the expansion degree of the setting assembly can be adjusted through the arranged locking and adjusting assembly, a good expansion sealing effect can be achieved for heat preservation plates with different thicknesses, the heat preservation plates can be automatically disassembled through the arranged disassembly assisting assembly, and the disassembly efficiency is improved. And the insulation board is more convenient and labor-saving to disassemble.

The utility model discloses a pneumatic conveying device for powder raw materials, and relates to the technical field of powder conveying. The pneumatic feeding device structurally comprises a feeding hopper, a pneumatic butterfly valve, a pneumatic feeding bin, a preparation conveying pipe and a feeding pipeline. The feeding hopper, the pneumatic butterfly valve and the pneumatic feeding bin are sequentially connected from top to bottom. The preparation conveying pipe is fixedly communicated with the lower end of the pneumatic feeding bin; and the feeding pipeline is mounted at the output end of the feeding pipeline. According to the utility model, the powder is pre-conveyed into the circular pipe butted with the feeding pipeline through the preparation conveying pipe, so that the time for starting to output the powder in the pneumatic feeding bin is effectively shortened under high airflow, and the conveying efficiency of the whole system is improved; the powder in the round pipe forms airtightness at the conveying front end, effective utilization of gas in the gas storage tank is improved, and energy waste is reduced. The two air storage tanks can be used alternately, the conveying frequency of pneumatic conveying of powder raw materials is increased, and the requirement for mixed and alternate conveying of various additives is met.

The utility model provides a movable floating bed device capable of reducing bottom mud pollution. The movable floating bed device comprises a floating bed, a waterproof enclosure, a stirring device and a fixed anchor block, the bottom area of the floating bed is enclosed into a closed area by the waterproof enclosure, so that the exchange between the internal water body and the external water body of the floating bed device is avoided during the operation of the floating bed device; the stirring device is a long-shaft stirring machine and is arranged at the geometric center position of the floating bed, the top of the stirring device is connected with the floating bed, and the stirring device is started to disturb sludge at the bottom of the water body, so that the water body in the waterproof enclosure forms turbid suspension liquid containing polluted organic substances. According to the floating bed device, the problem of poor growth of emergent aquatic plants in the floating bed in the micro-polluted water body is solved, meanwhile, water body bottom mud pollution can be degraded synchronously, and the requirements of purifying water quality and beautifying the environment are met.

The invention relates to an alkaline earth metal ion doped titanium-based phosphate composite material as well as a preparation method and application thereof, and belongs to the technical field of sodium ion batteries. The chemical formula of the alkaline earth metal ion doped titanium-based phosphate composite material is KxMyTiOPO4 / C, M is selected from one or more of beryllium, magnesium, calcium, strontium and barium, x is larger than or equal to 0.8 and smaller than or equal to 0.95, y is larger than or equal to 0.001 and smaller than or equal to 0.1, and the values of x and y meet the charge balance of the chemical formula. By doping alkaline earth metal ions, the lattice structure is effectively stabilized, and the exchange of K-Na ions is avoided, so that the cycling stability of the battery is remarkably improved, and the service life of the battery is remarkably prolonged.

The utility model discloses a two-dimensional code anti-exchange label based on a water-soluble base, and relates to the field of concrete test piece labels, the two-dimensional code anti-exchange label comprises a plastic base, a water-soluble film, a two-dimensional code layer and a concrete test piece, the lower end face of the plastic base is provided with a barb structure, and the barb structure on the lower end face of the plastic base is inserted into the concrete test piece to be fixed; a water-soluble film is adhered to the lower end face of the plastic base, two-dimensional code layers are sprayed on the lower end face of the water-soluble film and the lower end face of the plastic base, and the two-dimensional code layers are in contact with a concrete test piece. According to the two-dimensional code anti-exchange label based on the water-soluble base, the characteristics of the water-soluble film and the effect of the two-dimensional code layer are utilized, a self-attached label structure is formed, the two-dimensional code layer can be completely or partially integrated with a concrete test piece, and compared with a traditional adhesive label, the self-attached label can ensure the clearness of an identifier, and can also be used for preventing the replacement of the concrete test piece. And the label can be effectively prevented from being exchanged, and the use effectiveness is ensured.

The invention discloses a construction method of an FRP (Fiber Reinforce Plastic) constrained fly ash geopolymer roadside filling body, which relates to the technical field of coal mining, and comprises the following steps: firstly, preparing a prefabricated FRP pipe, a filling mold bag, a filling material containing fly ash and the like, and a related filling system; after the working face is pushed, preparation work such as top plate supporting is carried out, and then the prefabricated FRP pipe and the filling mold bag are installed to form a to-be-filled pipe column. The fly ash and other materials are stirred by a stirring station to prepare the fly ash-based geopolymer filling material, the filling material is injected into a pipe column filling mold bag, and after filling, an ultra-high molecular weight polyethylene belt is used for winding. And constructing an air leakage prevention wall comprising a metal net, air duct cloth and a reinforcing mesh, and laying a concrete layer to seal the goaf. According to the method, waste such as fly ash is fully utilized, the construction cost is reduced, the thermal damage problem of the high-temperature mine filling body is solved, the bearing capacity of the filling body is improved by means of FRP constraint, the gob-side entry retaining roof supporting effect is guaranteed, the coal resource recovery rate is increased, and coal-pillar-free continuous mining is promoted.

The present invention discloses a concrete test block anti-counterfeiting system and anti-counterfeiting method, which belongs to the field of concrete detection technology; it includes an anti-counterfeiting label card, and a sample preparation end and a laboratory end that communicate with a server and identify the anti-counterfeiting label card; the anti-counterfeiting label card includes: a substrate, an identification code and a direction indicator set on the front of the substrate, and a bending foot for fixing the substrate; the laboratory end performs anti-counterfeiting verification by identifying the installation orientation, angle, and distance of the anti-counterfeiting label card. The present invention significantly improves anti-counterfeiting security, enhances reliability, improves verification efficiency, and improves environmental adaptability; at the same time, it is connected to the laboratory and supervision platform to achieve connection and integration with the existing system; in addition, the system is set according to the national building materials management standards, compatible with other quality control systems, and easy to integrate into the existing management system, which promotes the industry standardization process and reduces the implementation cost.

The intelligent down filling system comprises a processing chamber, one side of the processing chamber is provided with a protective door used for feeding and discharging materials, and the lower end of the inner side of the processing chamber is provided with a supporting bottom plate; the access control module is arranged on the inner side of the processing chamber and communicates with the protective door through a wire so as to recognize incoming and outgoing materials; the down filling module is arranged on the supporting bottom plate and used for filling down after identifying the materials again; the collecting module is arranged on the lower surface of the supporting bottom plate; according to the system, materials can be conveniently detected and monitored in real time, the risk that the materials are lost is avoided, chips in the materials can be tracked and read through the system, the materials are prevented from being exchanged and lost, the fallen materials can be collected and recycled during down filling, waste is reduced, in the whole down filling process, workers are in a proper temperature and humidity environment, and the working efficiency is improved. Human health is facilitated, and the practicability of the system is improved.

The present invention relates to the technical field of general material processing devices, and discloses a decellularization device and a decellularization method, including a shaker body, a constant temperature chamber arranged in the shaker body, an oscillating table installed in the constant temperature chamber, and a sealing cover installed on the shaker body. The present invention uses a secondary drive component to open a guide slot and dock the secondary guide rail with the main guide rail, and then uses the main drive component to unload and move the assembly seat to the secondary guide rail, and finally uses the secondary drive component to move the sample to the secondary control chamber, and closes the guide slot again. This method can realize synchronous oscillation experiments of multiple samples, saving time, and can also automatically transfer and take a single sample during the experiment. In the process of transferring the sample, there is no need to open the sealing cover, which avoids the exchange of external air and air inside the constant temperature chamber, ensures the stability of the temperature inside the constant temperature chamber and the air environment, so that the experimental variables of the sample remain constant, and the experimental results are more accurate.

The utility model relates to mechanical equipment field discloses a cooling water spraying device for styrene storage tank, including the jar body, the outer wall fixedly connected with fixed block of jar body, the inner wall fixedly connected with the direct current pipe of fixed block, the top fixedly connected with ring pipe of direct current pipe, the inner wall fixedly connected with a plurality of spraying mechanism of ring pipe, the outer wall fixedly connected with a plurality of support of jar body, the outer wall fixedly connected with strengthening mechanism of jar body, the spraying mechanism includes the connecting pipe, the outer wall fixedly connected in the inner wall of ring pipe of connecting pipe, the bottom fixedly connected with the base of connecting pipe, in the utility model, through the motor of starting the inner wall of sliding block, motor drive force drives gear to rotate, under the cooperation of inner and outer rack plate of the inner wall of base, gear rotation drives sliding block to move in the base, and connecting column and connecting plate cooperate transmission force.

This invention provides a single-atom palladium-modified hierarchical porous molecular sieve adsorbent, its preparation method, and its application, comprising the following steps: S1. Adding a palladium complex to a molecular sieve gel and mixing evenly; S2. Crystallizing the product obtained in step S1 at a certain temperature for a certain time, and then washing, drying, and calcining to obtain the single-atom palladium-modified hierarchical porous molecular sieve adsorbent. In the preparation method of this invention, the palladium complex is used simultaneously as both a palladium source and a pore-forming agent, enabling the in-situ synthesis of the single-atom palladium-modified hierarchical porous molecular sieve adsorbent via a one-step method. The palladium species are anchored at ion exchange sites in an isolated single-atom ionic state, resulting in more effective adsorption sites with a more uniform distribution and higher NO content. x capacity.

The invention relates to the technical field of ovarian tissue preservation, in particular to low-temperature freezing equipment for ovarian tissue preservation, the lower portion of a tissue slice is blocked and limited through a limiting block, the problem that the tissue slice is stacked together due to vibration or liquid impact force is avoided, and therefore interference on freezing preservation operation of the tissue slice is avoided; the invention discloses low-temperature freezing equipment for ovarian tissue preservation. The low-temperature freezing equipment comprises a sieve, a long needle and a cylinder, the sieve is fixedly connected with at least two long needles; a cylinder is arranged on the side of the sieve; the device further comprises a limiting block, a housing I and a decompression filler; the cylinder is fixedly connected with at least five groups of limiting blocks, and each group comprises at least four limiting blocks; the lengths of the limiting blocks are gradually increased from top to bottom; the cylinder is connected with a housing I; a plurality of liquid permeable holes are formed in the housing I; and the inner side of the housing I is provided with decompression filler.

The utility model discloses a miniature dust test box, which is characterized in that a first filter is mounted at the top of a box body, a second filter covers an exhaust port on the rear end face of the box body, and the first filter can prevent dust from entering the box body from outside air, so that an exhaust fan is connected with the exhaust port of the box body through an exhaust pipeline; secondly, the box door is provided with an operation hole and an operation glove arranged corresponding to the operation hole, an operator can stretch the hand into the operation glove and then grabs the air pressure dust blowing gun, and then the air pressure dust blowing gun can blow dust to the air pressure dust blowing gun; the dust on the surface of a test sample can be effectively cleaned by 360 degrees through high-pressure airflow, the cleaning efficiency is greatly improved, the operation complexity is reduced, and the degree of harm to the body of an operator is greatly reduced when the test sample is cleaned.

The invention relates to a medical display. The medical display comprises a display module, the display module comprises a normal light-emitting area and an auxiliary light-emitting area, and the auxiliary light-emitting area is arranged on one side of the normal light-emitting area; the frame body is used for fixing the display module, the frame body comprises a fixing area, and the orthographic projection of the fixing area in the thickness direction at least partially covers the auxiliary light-emitting area; and the sensor is arranged in the fixed area of the frame body and directly faces the auxiliary light-emitting area, and the sensor is used for receiving light signals emitted by the auxiliary light-emitting area. Therefore, the arrangement of a mechanical transmission structure can be avoided, the problems of self damage and thick frame body caused by the arrangement of the mechanical transmission structure are also avoided, and meanwhile, the situation that an original display area needs to be changed into a test pattern during detection is also avoided, so that an existing normal light-emitting area can be normally used, and the detection efficiency is improved. And the sensor is prevented from moving under the driving of a mechanical transmission structure.

The utility model discloses a mould pressing pipeline flange heat preservation structure, which belongs to the technical field of flange heat preservation and comprises two groups of flange bodies, two groups of mounting shells, two groups of sealing gaskets and a plurality of groups of fasteners, flange mounting rings are arranged on the two groups of flange bodies, and the two groups of flange bodies are connected through the plurality of groups of fasteners. The two sets of installation shells are connected to the flange installation ring through the multiple sets of fasteners, the two sets of sealing gaskets are installed in the two sets of installation shells respectively, and the two sets of sealing gaskets are tightly attached to the flange installation ring. The two sets of flange bodies are connected through the multiple sets of fasteners, the installation shell provided with the sealing gaskets is installed on the flange installation rings on the two sets of flange bodies through the multiple sets of fasteners, and the multiple sets of protection layers are arranged in the installation shell to conduct heat preservation treatment on the two sets of flange bodies. The problem that a pipeline flange is prone to deformation due to heat loss in a low-temperature environment is solved.

The utility model discloses an air inlet sub-cavity anti-backfire gas engine cylinder cover, which relates to the field of engines and comprises a cylinder cover body, an air inlet valve and an air outlet valve are respectively arranged on two sides of the bottom end of the cylinder cover body, and combustion chambers matched with the bottom of the cylinder cover body are arranged at the bottom ends of the air inlet valve and the air outlet valve. A spark plug mounting pipe is arranged in the middle of the top of the combustion chamber; a first sealing assembly is arranged in the spark plug installation pipe. A plurality of camshaft seats are arranged on the inner side of the top end of the cylinder cover body, and valve guide pipes are arranged on the two sides of each camshaft seat. A second sealing assembly is arranged on the outer side of the top end of the cylinder cover body, first limiting holes are formed in the periphery of the top of the cylinder cover body, and limiting blocks matched with the cylinder cover body are arranged at one ends of the outer sides of the first limiting holes. Under the matching action of the first sealing assembly and the second sealing assembly, the sealing performance of the cylinder cover is effectively improved, and the tempering phenomenon of the air inlet sub-cavity caused by abnormal pressure or temperature is avoided.

The invention relates to the technical field of pressure detection devices, and discloses a pressure detection device in a hydraulic pipe, comprising a device body, a detection box fixedly connected in the device body, three detection slots on the surface of the detection box, two fixed rods fixedly connected to the surface of the detection box, a rotating rod fixedly connected to each fixed rod, a cover plate rotatably connected to the outer wall of each rotating rod, a slide rail fixedly connected to one side of the two cover plates, a moving rail fixedly connected to the bottom surface of the detection slot located in the middle, moving blocks slidably connected to the two slide rails and the moving rails, and a temperature control component connected in the detection box; the temperature control device is used to set the three detection slots to three different environments of high temperature, normal temperature and low temperature respectively, so as to simulate various temperature conditions that the hydraulic pipe may encounter in actual applications, thereby improving the comprehensiveness and accuracy of the detection, and providing a strong guarantee for the quality control and safe use of the hydraulic pipe.

The invention relates to the technical field of distribution box protection, and discloses a distribution box protection structure and a protection method thereof.The distribution box protection structure comprises a piercing assembly, the piercing assembly comprises a shell, a box door is arranged on the front face of the shell, and an air storage bag is fixedly connected to the top of the inner wall of the shell. The magnetism of the magnet is gradually reduced due to the influence of high temperature, when the temperature of the position reaches a dangerous degree, the magnetism of the magnet is reduced till the connecting frame cannot be attracted any more, at the moment, the connecting frame and the puncture plate integrally move upwards under the action of the first spring, and attention needs to be paid to that the first spring is in a compressed state during installation; when the puncture plate moves upwards, the spine fixed on the top of the puncture plate can be driven to move upwards together, after the spine is in contact with the air storage bag, the air storage bag is punctured, and compressed inert gas in the air storage bag can be discharged and then filled in the shell, so that open fire is prevented, and the distribution box can be prevented from generating open fire.

The present application relates to the field of biological sample collection device, in particular to a biological sample collection information tracing device, comprising: a tube body for storing biological samples; a sealing tube cover detachably installed at the opening of the tube body; a trigger component arranged between the tube body and the sealing tube cover; a clock chip cooperating with the trigger component to determine the opening time of the sealing tube cover; a memory for storing the opening time detected by the trigger component; a near field communication module for transmitting the opening time stored in the memory to a reading device; a microcontroller for processing the state of the trigger component to determine whether the sealing tube cover is opened and transmitting the information of the opening time to the memory; a circuit board for connecting the trigger component, the clock chip, the memory, the near field communication module and the microcontroller. The present application realizes the digitization and objective tracing state of the biological sample as soon as it is collected from the outside.

The invention relates to the technical field of intercepting wells, in particular to an unpowered anti-backflow intercepting well integrating floating and fixed vertical pipes, which comprises an intercepting well main body, a water outlet pipe is connected to the inner wall of the bottom end of one side of the intercepting well main body in a penetrating manner, and a water inlet end pipe is connected to the inner wall of the bottom end of the other side of the intercepting well main body in a penetrating manner; a main drainage vertical pipe and an auxiliary drainage vertical pipe are connected to the outer wall of the end, penetrating through the interior of the intercepting well body, of the water inlet end pipe in a penetrating mode, a grating plate is fixed to the inner wall, located above the water outlet pipe and the water inlet end pipe, of the intercepting well body, and the main drainage vertical pipe and the auxiliary drainage vertical pipe penetrate through the middle of the grating plate. A lifting moving pipe is inserted into the top end of the auxiliary drainage vertical pipe; according to the intercepting well, the outlet elevation of the vertical pipe can be automatically adjusted under different working conditions, river water backward flowing and waterlogging are effectively prevented, meanwhile, rain and sewage diversion is achieved, the efficiency and reliability of a drainage system are improved, the intercepting well does not need external power, the maintenance cost and operation complexity are reduced, and the intercepting well has wide application prospects.

A method and apparatus for performing channel access for a non-primary channel based on a handover timer in a wireless LAN system are presented. Specifically, a receiving STA receives a first management frame from a transmitting STA. And the receiving STA sends the second management frame to the sending STA. After expiration of the switching timer, the receiving STA performs channel access for the first non-primary channel.

The utility model discloses an inward-opening heat preservation window with a narrow frame and a narrow sash, relates to the technical field of door and window profiles, solves the problems that the heat preservation performance of the whole aluminum-clad wood window is poor, and heat energy is wasted, in the inward-opening heat preservation window, the indoor side visible face of an aluminum-clad wood heat preservation window frame sash is 102mm in total, the indoor side visible face of an existing aluminum-clad wood window frame sash is reduced, and the indoor side visible face of the window frame sash is reduced. The space area occupied by a wall is reduced, the visual field range and the lighting effect of the window body are improved, the frame outer aluminum piece and the frame inner wood piece are connected through the frame inner plastic piece, the space between the sash inner wood piece and the sash outer aluminum piece is filled with the sash connecting clamping piece, the frame outer aluminum piece and the frame inner wood piece are separated through the frame inner plastic piece, the heat preservation and heat insulation performance of the window frame is improved, and the service life of the window frame is prolonged. The joint of the window sash and the window frame is divided into the two airtight cavities which are not communicated with each other through the outdoor sealing rubber strip, the secondary sealing rubber strip and the indoor sealing rubber strip, the sealing performance between the window sash and the window frame is improved, air penetration and exchange are effectively avoided, and the heat preservation and heat insulation performance of the inward-opening heat preservation window is improved.

The utility model discloses a spectrometer. The spectrometer comprises a shell, an interferometer module, an out-of-cabin front light path element, an out-of-cabin rear light path element and a detector module. The shell comprises a core bin and a functional bin which are sealed and isolated, an interferometer module is arranged in the core bin, and an out-bin front light path element, an out-bin rear light path element and a detector module are arranged in the functional bin. The out-of-bin front light path element emits light from a light source into the core bin, and the interferometer module receives the light from the out-of-bin front light path element; and emergent light of the interferometer module is emitted out of the core bin and is emitted to the detector module through the rear light path element outside the core bin. Therefore, related elements are located in the functional bin and the core bin respectively, the functional bin is isolated from the core bin, impurities (such as dust) are prevented from being exchanged between the functional bin and the core bin, the waterproof and dustproof effects are achieved, and the impurities cannot affect optical elements in the core bin and the functional bin.

The present invention provides an iris dilator implanter and a manufacturing method thereof, and relates to the technical field of medical devices. The iris dilator implanter and a manufacturing method thereof include a storage portion and a tunnel, one end of the storage portion is fixedly connected to the tunnel, the end of the tunnel away from the storage portion is fixedly connected to the implantation portion, the end of the storage portion away from the tunnel is slidably connected to a plunger, a guide hook is provided in the upper middle portion of the plunger, and a tail limiter is fixedly clamped at the upper end of the plunger away from the implantation portion. A travel groove is provided in the upper middle portion of the tunnel and the implantation portion, and an iris dilator is provided inside the implantation portion. The iris dilator provided by the present invention has a simple structure, and makes the best use of the simple structure and exquisite design of the iris dilator used in conjunction with it. It is easy to store before use, does not require temporary safety disinfection preparation during use, and can be used after unpacking, thereby improving the convenience of use.

The present invention belongs to the technical field of ventilators, and discloses an emission reduction lighting ventilator and a working method thereof, including a filter box, a ventilation assembly fixedly installed at the front end of the filter box, an air inlet opened at the rear end of the filter box, a ventilation fan movably installed in the middle of the filter box, power assemblies installed on the left and right sides of the filter box, the middle of the power assembly penetrates the middle of the filter box and is fixedly connected with the ventilation fan, and a filter screen located between the ventilation fan and the air inlet is detachably installed at the rear end of the filter box. The present invention utilizes the power required by the device for exhausting air and distributes the power through the power assembly, so that the device can automatically clean the front and rear ends of the filter screen after being used for a period of time without disassembling the filter screen. The whole process is completed automatically without disassembling the filter screen, which can effectively avoid the problem that traditional devices require complicated disassembly and assembly processes, thereby improving the cleaning effect.

The invention discloses a bimetallic polymer catalyst and a preparation method and application thereof.Two chiral ligands are complexed with metal, a random copolymer is synthesized through a free radical copolymerization method, and the catalyst has a chiral amplification effect and can cooperate with the advantages of two chiral catalysts; according to the present invention, the catalyst can be used for catalyzing the cascade reaction of the asymmetric hydrogenation reaction (ATH) and the decarboxylated Mannich reaction, the high catalytic activity and the high stereoselectivity are represented, the catalyst can be recycled, and the catalytic activity and the selectivity of the catalyst have the high cycle stability.

The embodiment of the invention provides a drawer sealing device and a refrigerator, and relates to the technical field of refrigeration, and the drawer sealing device comprises an upper cover plate located in a refrigerating chamber and fixed to an inner container of the refrigerating chamber; a first cavity is formed by the lower portion of the upper cover plate and the refrigerating chamber inner container. The drawer bucket is in sliding connection with the refrigerating chamber liner; the drawer bucket slides in the direction of entering the first cavity or moving away from the first cavity. The sealing cover plate is arranged on one side, close to the drawer bucket, of the upper cover plate; the sealing cover plate is obliquely arranged, and the distance between the sealing cover plate and the upper cover plate is sequentially increased from the outer side of the refrigerator to the interior of the refrigerator. The top surface of the drawer bucket is an inclined surface corresponding to the sealing cover plate; when the drawer bucket is completely located in the first cavity, the top face of the drawer bucket is connected with the sealing cover plate, so that sealing of the interior of the drawer bucket is achieved. According to the drawer sealing device, high sealing performance can be achieved, the structure is designed in a hidden mode, structural parts are prevented from occupying the storage space, and the attractiveness and applicability of the refrigerator interior trim are improved.

The utility model discloses an air tap for cold and hot air perfusion, a vestibular cold and hot stimulator and a cold and hot air perfusion system, the air tap for cold and hot air perfusion comprises an air tap body and an extension tube arranged on the air tap body; an air inlet channel communicated with the extension tube is arranged in the air tap body, the extension tube can be inserted into the external auditory canal of a patient, and the far end of the extension tube can extend to the position close to the tympanic membrane of the patient. The vestibular cold and hot stimulator comprises a gas transmission handle and the gas nozzle for cold and hot gas perfusion. The cold and hot air perfusion system comprises the vestibular cold and hot stimulator. By adopting the technical scheme, the extension tube can go deep into an external auditory canal to be close to a tympanic membrane, cold and hot gas is directly conveyed, temperature and flow are ensured to accurately reach a target position, energy loss is reduced, and the accuracy of vestibular stimulation and diagnosis reliability are improved.