42results about How to "Achieve compactness" patented technology

The invention discloses coating equipment, which relates to the technical field of vacuum equipment and comprises an equipment main body, a workpiece adjusting device, a vacuum adjusting device and a coating source. The equipment body is provided with a vacuum operation cavity, the coating source is located at the bottom of the cavity, and the vacuum adjusting device communicates with the operation cavity. The workpiece adjusting device comprises an elastic clamping mechanism, a rotary adjusting mechanism and a two-stage lifting mechanism. The rotation adjusting mechanism is composed of a first adjusting frame, a second adjusting frame and a corresponding adjusting assembly. The first adjusting frame is installed on the second adjusting frame in a rotating mode around a horizontal shaft and driven by the first adjusting assembly. The elastic clamping mechanism is rotationally installed on the first adjusting frame around the vertical shaft and driven by the second adjusting assembly. The first lifting mechanism is connected with the second adjusting frame and drives the second adjusting frame to lift in the cavity; the second lifting mechanism drives the trigger piece to ascend and descend, and the clamping cavity is opened by pressing the elastic clamping mechanism. By means of the design, multi-dimensional posture adjustment of the coated workpiece and convenient clamping in the vacuum environment can be achieved.

The application relates to a compact active artificial knee joint with a torque adjusting device, which comprises a knee joint module, a receiving cavity connecting block, a lower leg connecting piece and a torque adjusting device, wherein the torque adjusting device comprises a spiral spring, a bent spring groove and the like, the knee joint module comprises a knee joint shell, a knee joint shaft center, a knee joint stator sleeve end cover and the like, one end of the spring is fixed at the upper receiving cavity connecting lug through an opening on the motor stator sleeve end cover, and the other end is fixed in the bent spring groove at the position of the motor stator sleeve end cover and the knee joint shaft center. The torque adjusting device can realize torque assistance and adjustment according to the angle size and direction of the limb rotation; meanwhile, the driving peak torque of the motor can be reduced, the size and the maximum torque of the driving motor are smaller due to the fact that the artificial limb needs to be easily worn, energy consumption and space are saved.

A waterway system of a fish tank comprises a fish tank body, a water inlet waterway, a water drainage waterway and a middle waterway, the water inlet waterway comprises a water inlet valve used for opening or closing the water inlet waterway, and the water drainage waterway comprises a water drainage valve used for opening or closing the water drainage waterway; when the water inlet valve is opened, the water inlet waterway is communicated with the fish tank body through the middle waterway, and when the water drainage valve is opened, the water drainage waterway is communicated with the fish tank body through the middle waterway. According to the waterway system of the fish tank, the water inlet waterway, the water drainage waterway and the middle waterway are arranged, the water inlet waterway comprises the water inlet valve, the water drainage waterway comprises the water drainage valve, when the water inlet valve is opened, the water inlet waterway is communicated with the fish tank body through the middle waterway, and when the water drainage valve is opened, the water drainage waterway is communicated with the fish tank body through the middle waterway. The water inlet waterway and the water outlet waterway share one middle waterway, redundant pipelines can be reduced, space layout is optimized, occupied space of the waterways is further reduced, and the waterways do not need large installation space.

The application relates to the technical field of intelligent mobile devices, in particular to a differential horizontal rudder wheel assembly which comprises a walking motor module, a steering motor module, a planetary reducer module and an optimized mechanical connection assembly. The walking motor and the steering motor are both servo motors, high-torque output and accurate control are realized by combining the planetary reducer; the mechanical structure is compact, the installation height is 340 mm, and the integration degree is high; the wheel body is made of polyurethane material, can bear 1500 kg and is suitable for complex working conditions; NPN normally open proximity switches are configured to realize closed-loop control. The application can provide high-precision and high-performance driving, is suitable for automatic devices such as intelligent logistics vehicles and AGV trolleys, meets the demand of complex working conditions and improves the operation reliability.

The utility model provides a top plate and an indoor unit of an air conditioner, wherein the top plate can achieve compactness of a packaging form during conveying and improve conveying efficiency, and the indoor unit of the air conditioner is provided with a shell comprising the top plate. The top plate constitutes a box-shaped housing that accommodates the heat exchanger and the blower. The top plate is provided with: an inner surface section facing the space side in the housing in which the heat exchanger and the blower are housed; an outer surface portion on the opposite side of the inner surface portion; and a depressed portion that depresses the inner surface portion and projects the outer surface portion. The deep drawing part is provided with a plurality of fixing parts for fixing bolts for attaching the blower to the top plate. When the inner surface parts of the two top plates are oppositely overlapped, the plurality of fixing parts of one top plate are respectively arranged at positions which do not overlap with any one of the plurality of fixing parts of the other top plate when observed from the overlapping direction of the two top plates.

The invention relates to the technical field of current converters, in particular to a method and system for adjusting the number of sub-modules in a modular multilevel current converter and electronic equipment. The method comprises the steps that target third harmonic zero-sequence voltage corresponding to each operation point in the operation range of the modular multilevel converter to be adjusted is determined, and the target third harmonic zero-sequence voltage is the third harmonic zero-sequence voltage enabling the bridge arm output voltage peak value of the modular multilevel converter to be adjusted to be minimum; under the condition that the modular multilevel converter to be adjusted is in a running state, determining a bridge arm voltage reference value of the modular multilevel converter to be adjusted under the current running point according to the target third harmonic zero sequence voltage corresponding to the current running point, and adjusting the number of sub-modules adopted in the modular multilevel converter to be adjusted according to the bridge arm voltage reference value. By adopting the scheme, the compactness and low cost of the modular multilevel converter can be realized.

The utility model relates to the technical field of financial equipment, and particularly discloses a sheet type medium conveying device and cash handling equipment, the sheet type medium conveying device comprises a mounting rack, a conveying mechanism, a driving mechanism, a first channel plate pivoted with the mounting rack through a first pivoting shaft, and a second channel plate pivoted with the mounting rack through a second pivoting shaft, the two channel plates are oppositely arranged in a spaced mode and form a conveying channel, and inlets and outlets are formed in the two ends of the conveying channel. The conveying mechanism comprises a conveying wheel fixedly connected to the first pivot joint shaft in a sleeving mode, the driving mechanism comprises a transmission assembly and a motor in transmission connection with the first pivot joint shaft, and when the motor drives the first pivot joint shaft to rotate in the first direction, the first pivot joint shaft drives the two channel plates to rotate in the opposite directions through the transmission assembly; therefore, one of the two inlets and outlets forms an opening with a larger size, the other one forms a closing opening with a smaller size, and the conveying wheel drives the sheet medium to move from the opening to the closing opening, so that the paper money can smoothly enter and exit from the conveying channel.

The invention relates to the technical field of preparation of concrete, in particular to LC3-basalt fiber regenerated block concrete and a preparation method thereof.The preparation method comprises the following preparation steps that S1, LC3 cement, regenerated blocks, natural sand and gravel are poured into a stirrer to be subjected to uniform dry mixing, and a dry mixture is obtained; s2, adding water, a modified water reducer and a performance modifier into the dry mixture, performing wet mixing, uniformly scattering modified basalt fibers during wet mixing, and performing uniform stirring to obtain a wet mixture; and S3, pouring the wet mixture into a test mold, standing at room temperature, demolding, and curing for 26-28 days to obtain the LC3-basalt fiber regenerated block concrete. Through the synergistic effect of the modified basalt fiber, the modified water reducer and the performance modifier, the compressive strength, the strength retention rate after high temperature and the tensile strength of the concrete are remarkably improved, and chemical activation and densification after the regenerated block is added are achieved.

The utility model relates to a damping device and power transmission device provide compact damping device. Damping device has first rotating part, second rotating part, elastic part and first friction part. First rotating part has along the circumference arrangement multiple first through -hole. Second rotating part has multiple second through -hole. Each second through -hole is when observing with the axial and corresponding each first through -hole overlap. Second rotating part is configured to be able to rotate with first rotating part. Elastic part links first rotating part and second rotating part elastically. First friction part is arranged between first rotating part and second rotating part. First friction part is constituted and slides with first rotating part in the radial inboard side to each first through -hole and each second through -hole. First friction part is constituted and rotates with second rotating part integrally.

The invention provides a cooling device and the like which can cope with complexity of a flow path of a heat medium and can realize compactness. A cooling device is provided with: a case (1) in which flow paths (C1-C5) through which a heat medium flows are formed; a four-way valve (70) and an eight-way valve (71) which are multi-way valves, are provided in the case (1), and switch the flow path of the heat medium in the flow paths (C1-C5) by the rotation of the valve rotation shaft of the four-way valve and the eight-way valve; and a first pump (3a), a second pump (3b), and a third pump (3c), which are provided in the case (1) and pressure-feed the heat medium in the flow paths (C1-C5), the first pump (3a) being provided on a first case side surface (1a) facing one side in the width direction (D1) intersecting the rotational axis of the multi-way valves (70, 71), the second pump (3b) being provided on a second case side surface (1b) facing the other side in the width direction (D1), and the third pump (3c) being provided on the case (1) and pressure-feeding the heat medium in the flow paths (C1-C5). The third pump (3c) is provided in parallel with the first pump (3a) in a height direction (D3) intersecting the width direction (D1) in the first case side surface (1a).

The portable disassembly and transportation monitoring equipment placing device of the application comprises a power supply box, a continuous monitoring equipment fixing module, an external equipment suspension module, an unmanned aerial vehicle landing / laser radar installation platform and a module interfixing structure; the device can maximize the utilization of functions, save space, reduce costs, play a greater role in extreme conditions and harsh sites in the field, has the advantages of multi-mode power access, short time endurance, external expansion, high expandability of the module, high compactness of the structure, reduction of space occupation, high strength and impact resistance of the structure, high safety of the structure, certain waterproofness of the whole equipment, naked use in rainy and snowy weather, cost reduction, repeated use of each module, high universality, avoidance of cost and resource waste caused by non-universal structural parts and high stability of the system.

The invention discloses an electromagnetic shielding-based layered wiring structure with a main manipulator easy-to-disassemble design. The structure comprises a structural member serving as a supporting framework and an easy-to-disassemble shell detachably mounted on the outer side of the structural member, and the structural member and the easy-to-disassemble shell are matched to form a wiring space; a guiding shielding piece is arranged in the wiring space and divides the space into at least two physical levels, and the guiding shielding piece is used for guiding different types of main wire harnesses to conduct layered wiring and achieve electromagnetic shielding. In addition, a first closed space formed by a fixing plate and an electromagnetic shielding cover is arranged in the base frame so as to contain a control element, and the tail end holding rotation mechanism guides the cable to be arranged in a split mode through the wiring open groove and the axial channel. According to the invention, electromagnetic crosstalk is effectively inhibited through layered shielding wiring, and the signal precision is improved; the maintenance process is simplified by utilizing the easy-to-disassemble shell; and through a scientific wiring path, the abrasion and shearing risks of the cable under complex movement are prevented, and the reliability and durability of the main manipulator of the surgical robot are remarkably enhanced.

The utility model relates to domestic appliance safety technical field discloses anti -tilt device, including flexible connecting piece and a plurality of anti -tilt support, flexible connecting piece is annularly arranged, a plurality of anti -tilt support are sequentially spaced apart along the extension circumferential direction of flexible connecting piece and are connected with flexible connecting piece, a plurality of anti -tilt support of the utility model are sequentially connected through flexible connecting piece, make whole structure can utilize the deformable characteristic of flexible connecting piece, flexible adaptation different the various shape of the article to be supported, whether regular square, round, or with the irregular mode such as rised, anti -tilt support can better adhere to the profile of the article to be supported through the adjustment of flexible connecting piece, thereby ensure that on various shapes of the article to be supported can stably install and play the anti -tilt effect, improve the versatility and adaptability of device, solved the problem that the anti -tilt base structure adaptability of purifier is limited.

The invention relates to the technical field of machine tool table tops, and discloses a preparation method for an aviation-grade clean workshop machine tool table top, which comprises the following steps: in a clean environment with a clean grade not lower than ISO5 grade, placing a polyurethane (PU) substrate on the machine tool table top; the surface of the PU substrate is subjected to through hole and precision treatment according to a preset array through a machining assembly in the machining and monitoring arm; the surface of a polyurethane (PU) substrate is covered with a composite functional coating, and the composite functional coating is subjected to thermocuring. According to the method, operation is conducted in the high-cleanliness environment with the whole process not lower than the ISO 5 level, and key links such as base plate pretreatment, profiling supporting system assembling, composite function coating coating and curing and in-situ precise grinding and polishing are strictly controlled, so that the extremely low particle release characteristic of the machine tool table top is fundamentally ensured; according to the method, the risk that the table top becomes a pollution source due to friction, abrasion or material volatilization in the precise machining or assembling process is effectively avoided.

The utility model discloses a photovoltaic folding plate support and a photovoltaic folding plate, and relates to the technical field of new energy, the photovoltaic folding plate support comprises an upper support plate and a lower support plate, the upper support plate is arranged on a first folding plate and is movably connected with the first folding plate; the lower supporting plate is arranged on the second folding plate and movably connected with the second folding plate, the upper supporting plate and the lower supporting plate are detachably connected and have a supporting state and a storage state, in the supporting state, one end of the lower supporting plate is connected with the second folding plate, the other end of the lower supporting plate abuts against the placing face of the photovoltaic folding plate, one end of the upper supporting plate is connected with the first folding plate, and the other end of the upper supporting plate abuts against the placing face of the photovoltaic folding plate. The other end is connected with the lower supporting plate, so that the first folding plate and the second folding plate are mutually unfolded; in the storage state, the upper supporting plate is attached to the first folding plate, and the lower supporting plate is attached to the second folding plate. According to the technical scheme provided by the utility model, the unfolded photovoltaic folding plate can be stably unfolded.

The heavy hinge with the angle measuring function comprises a first hinge body, a second hinge body and a rotating shaft connected with the first hinge body and the second hinge body, the rotating shaft is rotationally assembled with the first hinge body and fixedly assembled with the second hinge body, and at least one end of the rotating shaft is provided with a split encoder; a main body of the split type encoder is fixedly connected with the first hinge, and an inductive head of the split type encoder is coaxial with the rotating shaft and fixedly connected with the rotating shaft. According to the structural design, additional independent sensor installation space and structure are omitted, the structure is compact and integrated, meanwhile, a direct mechanical transmission path is adopted, back clearance, abrasion or errors possibly caused by middle transmission links (such as gears and connecting rods) are avoided, and the reliability of the sensor is improved. Therefore, the reliability, accuracy and long-term stability of angle measurement are remarkably improved while the overall structure is simplified and the assembly complexity is reduced.

This invention belongs to the field of spectroscopic instrument technology, and particularly relates to a snapshot-type FP interferometric array spectroscopic imager. The snapshot-type FP interferometric array spectroscopic imager includes: a front imaging mirror group for imaging target light onto a primary image plane and collimating the light emitted from the primary image plane into parallel light; an FP interferometric array for multi-beam interference modulation of the parallel light, outputting modulated light carrying interference information; a microlens array for aperture-splitting imaging of the modulated light to form an interferometric image array; and a relay imaging mirror group for secondary imaging of the interferometric image array and coupling the imaging results to a detector. This invention achieves a good balance between spatial resolution, spectral bandwidth, and spectral resolution, while enabling real-time snapshot detection of rapidly changing targets. This invention eliminates the need for moving mirror scanning, resulting in higher structural stability; and by eliminating the beam splitter, it effectively reduces the difficulty of system assembly and alignment.

The application relates to the technical field of offshore power generation, and provides an offshore wind power transmission system, a reactive power network construction control strategy determination method, device and equipment thereof. The method comprises the following steps: acquiring an operation condition of the offshore wind power transmission system; determining a reactive power network construction control strategy according to the operation condition; if the operation condition is a wind farm black start condition, the reactive power network construction control strategy is an auxiliary converter reactive power network construction control strategy; and if the operation condition is a wind turbine running-in condition, the reactive power network construction control strategy is the auxiliary converter reactive power network construction control strategy, a centralized wind turbine reactive power distribution link and a network-following wind turbine control strategy. The method determines different reactive power network construction control strategies through the operation condition, realizes wind turbine cooperative auxiliary converter reactive power network construction, makes the auxiliary converter not need to bear a high reactive power output, reduces the capacity requirement of the auxiliary converter, realizes auxiliary converter compactness and low cost, and thus reduces the construction cost of the offshore wind power transmission system.

The application discloses a wide-spectrum microwave generating system based on a magnetic switch, and aims at solving the problems of the existing wide-spectrum microwave generating system, such as difficulty in realizing high repetition frequency, long service life, stable operation and miniaturization. The application is composed of a primary power supply U0, an energy storage capacitor CC, a magnetic switch and a load antenna R. The switching of the magnetic core working state between the forward saturation point and the reverse saturation point is used to complete the current diversion on the winding of the magnetic switch, so as to generate wide-spectrum pulse oscillation on the load antenna, realize the miniaturization and compactness of the wide-spectrum microwave generating system, and effectively improve the repetition frequency operation ability and long service life working ability of the wide-spectrum microwave system by relying on the characteristics of high repetition frequency and long service life of the magnetic switch. The application does not need to use a pulse forming line to generate wide-spectrum oscillation, and is beneficial to realize the solidification and compactness of the wide-spectrum microwave system. The application uses the magnetic switch as a main switch, and greatly improves the service life of the wide-spectrum microwave system.

The utility model discloses an energy storage spiral fire extinguishing device which comprises a pipe body, a nozzle and a piston, the nozzle is arranged at one end of the pipe body, the piston is slidably mounted in the pipe body, and the other end of the pipe body is of a threaded locking structure. A fire extinguishing agent is stored in a space between the nozzle and the piston in the pipe body; a gas generating device is arranged in the space, between the piston and the threaded locking structure, in the pipe body, a starting device is arranged on the side, facing the piston, of the threaded locking structure, the gas generating device is in signal control connection with the starting device, and the starting device is externally connected with a power source. Through the integrated design of the pipe body, the nozzle and the piston, installation and maintenance are convenient; through signal connection between the gas generating device and the starting device, high-pressure gas is quickly generated after an electric signal is received to push the piston, so that a fire extinguishing agent in the pipe body is quickly released through the nozzle, and thermal runaway of the lithium battery is effectively inhibited; and meanwhile, the thread locking knot can be directly screwed and installed in the electric box and is convenient to replace, so that the maintenance cost and time are greatly reduced.

The application discloses a beam-controllable dual-frequency dual-circularly polarized antenna system based on linear polarization regulation. In view of the defects that the existing direct circular polarization reconfigurable unit is complex in design, limited in bandwidth, or the linear polarization regulation needs an external separate polarization converter, resulting in a bulky system, the application adopts a function decoupling architecture: a feed source is used for radiating dual-frequency dual-linear polarization signals; a beam regulation structure independently regulates the phase of the signals keeping the linear polarization state under the control of an electric control module; a polarization conversion structure is arranged on an exit path, and the regulated dual-linear polarization signals are respectively converted into dual-circular polarization signals with opposite rotation directions. In a reflective architecture, the polarization conversion structure and the feed source are spatially coplanar and integrated, eliminating physical obstruction; in a transmissive architecture, the two are stacked. The application retains the advantages of simple design and low cost of the linear polarization unit, and originally obtains dual-frequency dual-circular polarization radiation, and is suitable for reflective and transmissive arrays, and has compact structure and strong architecture versatility.

The invention belongs to the technical field of voice coil motors, and provides a voice coil motor, a voice coil motor control method and a photographic lens, and the voice coil motor comprises a coil assembly which comprises a first coil assembly and a second coil assembly, and the first coil assembly and the second coil assembly are arranged at an interval in the axial direction and can move in the axial direction; the magnetic strip assembly comprises at least two groups of alternately arranged magnetic strips, and the arrangement direction of the magnetic strips is parallel to the axial movement direction of the coil assembly; the magnet yoke assembly comprises an inner magnet yoke and an outer magnet yoke, the inner magnet yoke is embedded in the middle of each group of magnetic strips, and the outer magnet yoke surrounds the outer side of the coil assembly; wherein the ratio of the width to the length of the outer magnet yoke is 11: 20-13: 20, the magnetic strip assembly and the magnet yoke assembly are matched to form a closed electromagnetic loop, magnetic flux is generated in the area where the coil assembly is located, and a magnetic flux surface formed by the magnetic flux is parallel to a virtual plane in the axial movement direction of the coil, so that the magnetic field uniformity and the magnetic energy utilization rate are improved, and the overall size is reduced; and the operation efficiency of the voice coil motor is effectively improved.

The present application relates to brake pad processing technical field, especially drum brake pad universal grinding equipment and grinding method, including frame, polishing mechanism, drive the second drive part of the polishing mechanism moves along the first direction, fixed mechanism includes base and clamp, first fixed base and second fixed base are slidably connected with the base, the top of first fixed base and second fixed base is respectively provided with support seat for supporting both sides of brake pad, the top of support seat is provided with at least two non coplanar, also mutually non parallel abutment surface, after brake pad is placed above support seat, the side surface of both sides of brake pad and below are respectively contacted with two abutment surface. Through the polishing equipment and polishing method of the present application, the processing of plane brake pad, inner arc surface and outer arc surface of cambered surface brake pad and different size brake pad can be realized, which significantly improves the universality of the equipment.

This application provides a 3D display system and device, relating to the field of display technology. An image source provides a light beam; a first quarter-wave plate controls the polarization direction; a 3D imaging grating assembly separates the parallax beam; a semi-transparent, semi-reflective assembly splits the beam through reflection and folds the optical path; and a second quarter-wave plate, in conjunction with a polarization reflection assembly, folds the beam back and calibrates the polarization direction. Finally, the beams corresponding to the left and right eyes are incident on the human eye, forming a 3D image. The optical components in each 3D display system are arranged along the output direction of the image source's optical axis, forming a flat, stacked optical structure. This facilitates multiple folds and propagations of the beam in the optical path before it reaches the human eye to complete the image, effectively improving the clarity, stability, and overall image quality. The first and second quarter-wave plates effectively isolate stray light directly emitted from the image source and invalid beams in the optical path that have not undergone polarization direction conversion, preventing stray light from interfering with the clarity of the image.

The invention discloses a compact low-frequency resonance opto-acoustic Raman detection system and method based on hollow-core optical fiber enhancement, and belongs to the technical field of gas detection.In the system, low-energy and high-frequency pulse laser generated by a high-repetition-frequency and low-energy laser source module is focused by a convex lens and then enters a hollow-core optical fiber Raman frequency shifter module; after being collimated by an achromatic collimating lens, two-color coherent light beams output by the hollow-core optical fiber Raman frequency shifter module are coaxially emitted into the spiral connection tube type low-frequency resonance photoacoustic cell, and excited resonance photoacoustic signals are collected by a first microphone arranged in a signal cavity of the spiral connection tube type low-frequency resonance photoacoustic cell and a second microphone arranged in a reference cavity of the spiral connection tube type low-frequency resonance photoacoustic cell; and the signal acquisition and processing unit is electrically connected with the first microphone and the second microphone and is used for performing differential phase locking processing and concentration inversion on the acquired resonance photoacoustic signals to obtain the concentration value of the gas to be detected. According to the invention, precise locking of the laser repetition frequency and the acoustic resonance frequency and high-Q-value resonance amplification of the photoacoustic signal are realized.

The invention discloses a preparation method of antioxidant compact compound tungsten carbide-based rare metal ceramic, and relates to the field of metal ceramic. Firstly, a silicon carbide substance is introduced through polycarbosilane, ceramic pores are filled with metal zirconium through a metal infiltration reaction, compactness is improved, and meanwhile the oxidation resistance of a ceramic matrix is enhanced; and then, a tungsten carbide enrichment layer is formed on the surface of the ceramic in a mode of combining ion injection infiltration and spraying, and the high-temperature and high-speed tungsten carbide and the metal adhesive are combined with the originally injected tungsten carbide enrichment layer into a whole during spraying. Secondly, high-proportion rare metal nano rhenium is adopted, and material surface densification of the tungsten carbide-based metal ceramic compound coating in a high-temperature environment is achieved; finally, through hydrogen reduction treatment, the oxygen content of the powder is further reduced, and the high-activity low-oxygen compound carbide rare metal ceramic with the nanocrystalline structure is produced. The ceramic prepared by the invention has the effects of oxidation resistance and compactness.

The utility model relates to a rotary transformer, a stator and a motor system. A resolver includes: a stator (10) having an arc-shaped structure extending in a circumferential direction; and a rotor (20) disposed radially inward of the stator (10) and configured to be rotatable with respect to the stator (10), in which the rotor (20) includes N convex portions (21) and N concave portions (22), the convex portions (21) and the concave portions (22) are alternately arranged in a circumferential direction, N is an integer and is equal to or greater than 2, and in which a central angle [theta] of the stator (10) satisfies: 360 degrees / N < = [theta] < 360 degrees.

This invention belongs to the field of piezoelectric materials and discloses a lead nickel tungstate-lead zirconate titanate piezoelectric ceramic and its preparation method. The general chemical formula of the lead nickel tungstate-lead zirconate titanate piezoelectric ceramic of this invention is: xPb(Ni 1 / 2 W 1 / 2 )O3-yPbZrO3-(1-x-y)PbTiO3+zwt%MnO2; where, 0.05

The invention relates to a multifunctional integrated hydrogenation system based on a direct-driven compression module and a hydrogenation machine. A first electric valve and a first pressure release valve are arranged on a filling pipeline for connecting a hydrogen source and the direct-driven compression module; a hydrogen source enters the first heat exchange channel for primary precooling and then enters the direct-driven compressor for primary compression; the hydrogen subjected to primary compression enters the direct-driven compressor to be subjected to secondary compression after being subjected to secondary cooling through a second heat exchange channel; after secondary compression, the air enters a third heat exchange channel to be cooled for the third time, and then enters an output pipeline connected with the output end and the direct-drive compression module; temperature and pressure sensors are arranged on a pipeline between the direct-driven compressor and an inlet of the heat exchanger b1 and a pipeline between the direct-driven compressor and an inlet of the heat exchanger c1; the electric control module controls the opening and closing degree of the first electric valve and / or controls the first pressure release valve to release pressure according to the received hydrogen temperature and pressure intensity sent by the temperature sensor and the pressure sensor. According to the invention, high efficiency, compactness and intellectualization of the hydrogenation machine are realized.

The invention provides a rigid orthokeratology lens cleaning device and a flip hinge structure thereof. According to the flip hinge structure, the U-shaped groove is formed in the bottom face of the sealing groove, and the matching length of the shaft pin and the lower shell is increased. The U-shaped groove is directly formed on the injection mold through a male mold structure integrally machined at the corresponding position of the upper mold core, is integrally designed with a forming male mold of the sealing groove, and is synchronously formed along with the sealing groove during mold closing injection molding. The lateral core-pulling mechanism of the shaft pin insertion hole for forming the lateral groove body on the mold is kept unchanged, so that the service life of the flip hinge structure is remarkably prolonged under the condition that the size of the compact structure is kept unchanged. The cleaning device adopts the runway-shaped contour design, the flip cover is designed to be offset relative to the upper cover plate, one side of the upper cover plate serves as a working state display area, wiring is not needed in the flip cover, the overall structure is compact, the space utilization rate is greatly increased, and the cleaning device is small in size and convenient to carry and store; and meanwhile, due to the uniform outline design, the integration and the attractiveness of the whole appearance are also improved.