52results about How to "Speed block" patented technology

The invention relates to the technical field of infrared target detection, in particular to a light-weight real-time infrared target detection method and system for an unmanned ship, and the method comprises the steps: collecting infrared data through an infrared thermal imager carried by the unmanned ship, and carrying out the preprocessing, marking and dividing. And a lightweight GLAF-MobileNetV4 network is adopted as a backbone of the detection method, so that the real-time performance is improved, and model parameters are greatly reduced. Wherein the lightweight global and local adaptive fusion attention can ingeniously integrate global and local information, and local information fusion is adjusted and optimized through dynamic weight. Meanwhile, the designed dynamic adaptive multi-scale feature fusion encoder adaptively adjusts the fusion proportion according to the importance of the multi-scale features by using an attention guidance mechanism. The method is simple and convenient to deploy, improves the target detection precision and real-time performance of the unmanned ship under the low-light condition, and is remarkable in detection efficiency.

The invention relates to a robot G3 continuous corner smoothing method based on a Bezier curve. The method comprises the steps that robot small line segment machining tool nose position data is input, six times of Bezier curves are adopted for transfer fairing under a workpiece coordinate system, and control points of the Bezier curves are analyzed and calculated according to the maximum allowable value of tool nose position fairing errors and the condition constraint that G3 at the curve connection position is continuous; secondly, robot small line segment machining cutter axis direction data are input, six times of Bezier curves are adopted in an RPY angle space under a workpiece coordinate system for transfer fairing, and control points of the Bezier curves are analyzed and calculated according to the maximum allowable value of fairing errors in the cutter axis direction and the condition constraint that G3 at the curve connection position is continuous; and finally, parameter synchronization is carried out on the cutter shaft direction and the cutter point position path after switching and smoothing, and a B spline straight line is adopted to replace the remaining linear section. According to the method, continuous and smooth switching of the tool path G3 can be realized analytically, no iterative computation is needed, and the processing real-time performance and stability are improved while the fairing error is controllable.

The invention relates to the technical field of temperature early warning management, in particular to an electrolytic bath temperature central monitoring and early warning system. The system comprises an in-tank temperature frequency domain analysis module, an in-tank temperature and energy consumption influence analysis module, an in-tank electrolytic strength abnormity response adjustment module, an in-tank temperature over-low abnormity early warning adjustment module and an in-tank iterative execution influence analysis module. Temperature sensors are arranged at key positions in an electrolytic cell to monitor temperature signal distribution in the cell in real time and carry out frequency domain analysis, and meanwhile, corresponding current and voltage are obtained, electrolyte energy consumption analysis and time sequence influence analysis are carried out, and a time sequence correlation influence degree is obtained; and if the conditions are gradually increased and the temperature fluctuation is increased, designing and implementing an energy consumption abnormity response measure, if the conditions are gradually reduced and the temperature fluctuation is reduced, designing and implementing a temperature abnormity response measure, and if the conditions are judged to be other conditions, continuing to iteratively execute the time sequence influence analysis. The stability and quality of the electrolysis process can be guaranteed.

The invention relates to the technical field of warp knitting machine control, in particular to a carbon fiber warp knitting machine operation method based on the Internet of Things, which comprises the following steps: determining a knitting control state of a warp knitting machine, determining an initial knitting speed and matching a traction speed according to the initial knitting speed; determining a central area and an edge area of the braided fabric according to the raw material diameter of the carbon fiber raw material and the target fabric density; determining the motion trails of the warp knitting needle and the sinker in the knitting process so as to determine the equipment characterization state of the warp knitting machine; determining whether the warp knitting machine acquires a surface image of the braided fabric or not according to the equipment characterization state; acquiring a surface image of the braided fabric at each preset time node to determine a density characterization trend of the braided fabric; determining an operation characterization trend according to the density characterization trend to determine whether to adjust the initial knitting speed; according to the center flat state and the fabric edge state, the operation characterization trend is secondarily determined so as to determine whether to adjust the traction speed or not. Therefore, linkage among links of monitoring equipment, controlling the quality of braided fabric and optimizing the production process is realized.

The invention discloses an industrial waste salt rapid decomposition treatment device and method, and relates to the technical field of industrial waste salt treatment.The industrial waste salt rapid decomposition treatment device comprises a fixing unit which comprises a fixing steel frame, a supporting frame arranged at the bottom of the fixing steel frame and a ladder arranged on the supporting frame; the reaction unit comprises a reaction assembly arranged on the fixed steel frame; the catalytic unit comprises a catalyst adding part arranged on the reaction assembly and a catalyst liquid supplementing part arranged on the catalyst adding part, and the catalyst liquid supplementing part is connected with the fixed steel frame. Through cooperation of the electric push rod and the quantitative barrel, accurate control of the adding amount of a catalyst is achieved, so that the reaction efficiency and the treatment speed are improved, automatic operation is formed through cooperation with the reaction sensor, the operation process is simplified, the operation complexity is reduced, the achievement rate of a treatment target is increased, and resource waste is reduced.

The utility model discloses polycrystalline silicon and organic silicon high boiling pyrolysis reactor system of promoting gas solid liquid three -phase mass transfer relates to chemical industry technical field. The polycrystalline silicon and organic silicon high boiling pyrolysis reactor system of promoting gas solid liquid three -phase mass transfer, including reactor main part, catalyst stacking unit, liquid distributor main part and gas distribution unit. The polycrystalline silicon and organic silicon high boiling pyrolysis reactor system of promoting gas solid liquid three -phase mass transfer, gas catalyst passes into the exhaust pipe through the communication groove, and then gas catalyst is evenly sprayed into the catalytic filler of loading net cylinder through the spray head, and the liquid raw material is evenly flowed through the catalytic filler of loading net cylinder through the liquid distribution port, so that the gas and solid catalyst are mixed in the loading net cylinder, the reaction rate is improved, and the uniformity of mixing is ensured, the mixing effect of liquid raw material and gas is improved, and the reaction and product generation are accelerated.

The present application relates to elevator technology field, specifically relates to a kind of elevator with hidden emergency device of car, including the car in hoistway, installation port is opened in the thickness direction through in car side wall, and rotatingly installed with display device in car inner wall.Display device blocks installation port, and power supply assembly, controller and speed sensor are embedded in display device.Display device is electrically locked between car, and electrically locked is used to lock display device and car.Car outside is provided with anti-falling brake mechanism, and the rear side of display device close to installation port is hinged with one end of pull rod assembly, and the other end of pull rod assembly is connected with the locking assembly of anti-falling brake mechanism after passing through installation port, and anti-falling brake mechanism has working state and locking state.In locking state, locking assembly locks anti-falling brake mechanism, and anti-falling brake mechanism does not hinder the lifting of car.

The invention discloses a transportation route optimization method and device, and a computer program product, and the method comprises the steps: obtaining a to-be-optimized transportation route, constructing a directed graph, and carrying out the traversal of the directed graph based on a depth-first search mode, so as to obtain all combined paths; constructing an N graph model based on all the obtained combined paths; and solving the constructed N-graph model based on a maximum flow minimum segmentation algorithm. Combinations conforming to conditions are quickly and efficiently traversed through a graph model and a DFS method, internal storage and processing speed bottlenecks caused by multiple times of connection of full-quantity orders are avoided, and then minimization of transportation cost and maximization of income are achieved by using an N graph and a maximum flow and minimum cut method. The problems that in the related technology, combination and optimization of lines often depend on experience and manual calculation, efficiency is poor, and a globally optimal solution is difficult to achieve are solved.

The present invention is a fully automatic stacking, stringing and stacking system for hanging labels, comprising a frame, on which a first workbench, a second workbench, an operating table, a label placement area, a label stacking device, a sheet pressing device, a sheet flipping device, a stringing device, a label rack and a label taking device are arranged. The present invention classifies and places long labels and short labels in different areas through the label placement area, places long labels and various short labels on the operating table in sequence through the label stacking device, and then completes the folding operation of the long label through the cooperation of the sheet pressing device and the sheet flipping device, and then completes the stringing operation through the stringing device, and completes the storage operation under the table through the label taking device, thus realizing a fully automatic workflow from single-sheet taking, stacking, sheet pressing, sheet flipping and folding, stringing to label taking, with high speed and efficiency.

The utility model relates to the field of shot blasting treatment especially relates to a kind of shot blasting and sand blasting collection device, including mounting seat, the mounting seat is rotatably connected with screening bucket, the mounting seat is equipped with driving motor, the output shaft of driving motor is connected with the screening bucket, the mounting seat is slidably connected with collection arc-shaped plate, the collection arc-shaped plate is located the downside of the screening bucket, for collecting the material screened by the screening bucket.The utility model is rotated by driving motor and drives screening bucket, utilizes the joint action of centrifugal force and gravity to make material fully move in screening bucket, accelerate the material meeting the size requirement to pass through sieve hole, compared with artificial screening or fixed sieve plate screening, high-efficiency screening can be realized without manual intervention, greatly reduce labor intensity, simultaneously adapt to the material processing demand of large-scale shot blasting and sand blasting operation, shorten material processing cycle.

The utility model discloses an electric toothbrush, and relates to the field of articles for daily use. The toothbrush main body comprises a machine core bracket; the bottom cover is arranged at the bottom of the movement bracket; and the brush handle coil rack is arranged between the bottom cover and the machine core bracket, the brush handle coil rack and the machine core bracket are positioned and matched through a positioning structure, and the bottom cover is fixedly connected with the machine core bracket so as to lock the brush handle coil rack. The charging speed of the electric toothbrush is prevented from being reduced or the electric toothbrush cannot be charged.

The utility model discloses a high-efficiency adjustable quantitative filling device which comprises a material hopper, a base, a supporting and fixing frame, an adjustable quantitative assembly and a movable intercepting assembly, the supporting and fixing frame is installed on the base, and the adjustable quantitative assembly is adjustably installed on one side of the supporting and fixing frame; the movable intercepting assemblies are arranged on the two sides of the adjustable quantifying assembly, a receiving hopper is arranged at the top of the adjustable quantifying assembly, a discharging pipe is arranged at the bottom of the adjustable quantifying assembly, and the material hopper is arranged above the receiving hopper; according to the quantitative filling device, the two sides are blocked in turn through the movable intercepting assembly, materials are evenly discharged, so that the material filling speed of the adjustable quantitative assembly is increased, the quantitative filling efficiency of the quantitative filling device is improved, meanwhile, the materials are not prone to being damaged, and the adjustable quantitative assembly can adjust the capacity of an adjustable measuring cup according to the filling specification.

The invention provides a new energy unit transient stability optimization method and system based on active feed-forward, and belongs to the field of new energy power generation. The system includes a current command generator and a current controller. The method comprises the steps of collecting terminal voltage and current of a unit, calculating active power and detecting a transient fault; when a fault is detected, generating an active current instruction through active feed-forward control based on power grid voltage information obtained by an active power signal, a fault voltage amplitude signal and phase locking; meanwhile, a reactive current instruction is generated; a current reference instruction is synthesized, and a converter is driven through closed-loop control to provide power support. According to the method, an active feed-forward mechanism is introduced, so that the new energy unit can respond to the power shortage of the power grid in advance, active and reactive support is quickly provided, frequency drop and power oscillation in the transient process are effectively inhibited, and the transient stability of the power system under the access of high-proportion new energy is remarkably improved.

The application relates to the technical field of small catheter production, and particularly discloses a small catheter automatic packaging device and process for a tunnel, which comprises a blanking mechanism, which is used for carrying small catheters and controlling the conveying of the small catheters; a transfer mechanism, which comprises a loading rack arranged at a blanking end of the blanking mechanism and a conveying assembly arranged on the loading rack, and the conveying assembly is used for conveying the small catheters falling into the loading rack; and a packaging mechanism arranged at an output end of the transfer mechanism, which is used for packaging the small catheters removed from the loading rack. The blanking mechanism, the transfer mechanism and the packaging mechanism are arranged, so that the whole process automation from small catheter receiving, temporary storage, conveying and packaging is realized. The blanking mechanism releases the small catheters in an orderly manner, the transfer mechanism receives and conveys the whole batch of small catheters, and finally the packaging mechanism completes the packaging work, the three mechanisms work cooperatively, a continuous automatic processing flow is formed, and the production efficiency is improved.

The invention discloses a construction method based on preparation of an ultrafast setting-fast setting-slow setting double-liquid grouting material. The construction method comprises the following steps: 1) respectively performing grouting plugging in three modes of ultrafast setting, fast setting and slow setting according to actual working condition requirements; (2) when the rapid plugging working condition needs to be met, phosphoric acid-water glass pre-gelatinization is conducted at the first position of the Y-shaped pipe, then pre-gelatinized slurry and cement are mixed to the third position of the Y-shaped pipe, and the gelatinization time is shorter than 15 s; (3) when a curtain grouting reinforcement working condition is needed, water glass slurry and cement are mixed to three positions of the Y-shaped pipe, a proper amount of conventional inorganic salt additives are added, and the gelling time is 25-50 s; and 4) when weak surrounding rock and a permeable rock-soil layer need to be subjected to grouting reinforcement, phosphoric acid is dissolved in water and converged in a second Y-shaped pipe, then the phosphoric acid and cement are prepared into cement grout, then the cement grout and water glass grout are mixed into a third Y-shaped pipe, and the gelling time is longer than 60s. The method has the advantages that the usage amount of additives is reduced, and the full-coverage grouting effect from ultrafast setting to slow setting is achieved.

The invention relates to a composite substrate structure, an epitaxial structure and a preparation method of the composite substrate structure, and the composite substrate structure comprises a patterned substrate which comprises a base layer and a patterned layer, the patterned layer is formed on the upper surface of the base layer, and the patterned layer comprises a plurality of protruding parts; the buffer layer and the undoped semiconductor layer are sequentially laid on the patterned substrate; the thickness of the buffer layer is smaller than the height of the protruding part; the undoped semiconductor layer can completely submerge the buffer layer, the upper surface of the undoped semiconductor layer is provided with a pit matched with the protruding part, and a blocking part is arranged in the pit; the downward projection of the blocking part at least can cover the central area of the protruding part; the blocking part is made of an amorphous material, and the heat conductivity coefficient of the blocking part is lower than that of the undoped semiconductor layer.

This invention relates to the field of membrane laying technology, and more particularly to a geomembrane laying device. It includes a frame with two sets of rollers symmetrically arranged on it. These rollers work together to support the geomembrane roll. A base plate is detachably mounted at both ends of the geomembrane roll on the frame. A primary spring is mounted on the base plate, with a truss plate above it. A secondary spring is mounted on the truss plate, and a support is mounted above the secondary spring. A horizontal insert is detachably mounted on the support, with a rod inserted into the insert. A top spring is positioned between the rod and the insert. This multi-stage buffer structure, combining primary and secondary springs, along with the top spring, achieves graded dispersion of elastic tension, significantly reducing the geomembrane pinching and tensile damage problems caused by the concentrated tension of traditional single-segment springs, thus ensuring the geomembrane's impermeability and service life.

According to the machine defect trend and historical action rapid query method and device, the medium, the program product and the terminal, integrated query and analysis functions are provided, and the machine management and fault handling capacity is remarkably improved. A user can easily inquire detailed actions and states of a machine and obtain a closed-loop result of a case so as to evaluate the effect of improvement measures, and all information is presented through a visual chart. The machine state chart and defect data analysis are integrated, a user can comprehensively understand the historical operation condition of the machine, identify abnormal reasons and effective countermeasures, and provide a basis for quick response, so that the wafer influence quantity is reduced, and the yield fluctuation is controlled. And real-time and historical data query is supported, so that the working efficiency is greatly improved, and the problems of low speed and tedious process of manual query are avoided. Meanwhile, the database comprehensively records detailed action information of the machine, data incompleteness is overcome, and a user can analyze defect distribution and directivity problems in a specific time period.

The application discloses a method and device for suppressing wide-frequency oscillation of a converter, equipment and a medium, and belongs to the field of power grid safety. The method is as follows: obtaining the fundamental equivalent impedance of the converter corresponding to the fundamental frequency and the wide-frequency equivalent impedance corresponding to each interference frequency through a preset interference signal; judging the damping characteristic of the converter according to the real part of the fundamental equivalent impedance; if the damping characteristic is positive, and the imaginary part of at least one wide-frequency equivalent impedance satisfies a preset resonance criterion, determining a resonance frequency band from all interference frequencies, and adjusting the current control loop parameters of the converter according to the resonance frequency band until all imaginary parts do not satisfy the preset resonance criterion, so as to realize wide-frequency oscillation suppression; wherein, the preset resonance criterion is determined according to the reactance characteristic of the wide-frequency equivalent impedance. The application can improve the accuracy of wide-frequency oscillation suppression of the converter.

The invention discloses a laminated imaging method, device and equipment, a medium and a product, and the method comprises the steps: collecting all diffraction sub-graphs of a to-be-recovered sample based on a circular probe; respectively guessing the light intensity distribution of the to-be-recovered sample and the circular probe to obtain a guessed object field image and a guessed circular probe; according to the current random order, each diffraction sub-graph is recovered according to the guessed object field image and the guessed circular probe, and an initial recovery image is obtained; the current random order is a recovery order of updating all diffraction sub-graphs once; according to a preset threshold value and the guessed radius of the circular probe, error information of the edge area of each initial recovery image is eliminated, and each target recovery image is obtained; and according to each target recovery image, determining a recovery image of the to-be-recovered sample. And the convergence speed and the imaging quality of laminated imaging can be improved.

The utility model discloses an automatic feeding device for a pin flattening and bending device. The automatic feeding device comprises a storage device and a feeding manipulator, wherein the storage device and the feeding manipulator are arranged on the same rack as the flattening and bending device; the material storage device and the flattening and bending device are transversely arranged in parallel, the material storage device comprises a base, a longitudinal sliding seat, a lifting mechanism and a material plate, the lifting mechanism is arranged on the longitudinal sliding seat, the material plate is clamped in front of a lifting moving seat of the lifting mechanism, and PIN insertion holes distributed in a rectangular dot matrix shape are formed in the material plate; a feeding manipulator is arranged in front of the storage device and the flattening and bending device, the feeding manipulator comprises a transverse moving mechanism and a transverse sliding seat, a longitudinal moving mechanism is arranged on the transverse sliding seat, and a mechanical finger is mounted on one side of the longitudinal moving mechanism. The feeding manipulator is specially responsible for transverse and longitudinal movement in the horizontal plane, the storage device continuously supplements PINs through lifting, and the storage device and the feeding manipulator are connected and matched to complete automatic feeding.

The utility model discloses a feeder for accurately feeding rice and shrimps, which relates to the technical field of rice and shrimp feeders and comprises a feed box, a blanking hopper communicated with the bottom surface of the feed box, a cover plate hinged to the top surface of the blanking hopper, two flange pipes symmetrically communicated with two sides of the bottom end of the blanking hopper, and four supporting legs arranged on the peripheral side of the bottom surface of the feed box. A mounting platform is fixedly connected to the positions, located in the middle of the discharging hopper, of the four supporting legs, a scattering assembly is arranged on the mounting platform, a pneumatic feeder is arranged on one sides of the bottom ends of the four supporting legs, an output shaft of the pneumatic feeder is connected with one of the two flange pipes through an air supply connecting pipe, and a conveying pipe is arranged on the other flange pipe in a communicating mode. According to the utility model, the pneumatic feeder, the air supply connecting pipe and the flange pipe are matched, so that a stable power source can be conveniently provided; finally, the problems that traditional equipment is unstable in power output, uneven in feed scattering and difficult to meet diversified feeding requirements are solved, and the overall efficiency and effect of feed conveying and feeding are improved.

This application relates to the field of semiconductor technology. Embodiments of this application provide a surge negative charge driving circuit and a switching power converter for suppressing crosstalk, comprising: a driving module and a surge negative charge module; a first terminal of the driving module receives an input signal, and a second terminal of the driving module is connected to the gate node of a silicon carbide MOSFET, used to control the turn-on and turn-off of the silicon carbide MOSFET according to the input signal; a first terminal of the surge negative charge module receives the input signal, a second terminal of the surge negative charge module is connected to a power supply terminal, a third terminal of the surge negative charge module is connected to a ground terminal, and a fourth terminal of the surge negative charge module is connected to the gate node of the silicon carbide MOSFET, used to release negative charge to the gate node during the turn-off process of the silicon carbide MOSFET when the drain voltage of the silicon carbide MOSFET rises, causing Miller current to flow back to the gate node, in order to neutralize the Miller current. Highly efficient crosstalk suppression is achieved through the physical method of charge neutralization, without relying on a continuous negative voltage power supply, simplifying the system architecture and reducing costs.

The application discloses a hyperspectral imaging data processing method for analyzing rock-soil particle shape and mineral components, and comprises the following steps: acquiring hyperspectral data of a mineral particle to be measured, and preprocessing the hyperspectral data of the mineral particle to be measured; obtaining a mineral component test set based on the preprocessed hyperspectral data of the mineral particle to be measured; calling a generated mineral component model weight file to identify and classify the mineral component test set, obtaining corresponding end-member mineral components, and statistically obtaining mineral components and relative contents of each mineral component based on the end-member mineral components, so as to realize mineral component analysis of the mineral particle to be measured. The application can accurately realize joint analysis of the shape and the mineral components of the mineral particle.

The utility model relates to the technical field of necked water bags of smelting furnaces, and aims to solve the problems that the existing necked water bag of the smelting furnace is directly attached to the inner wall of the smelting furnace, the flowing path, speed and the like of molten glass can be changed by a crack and an attached included angle, and the homogenization and clarification processes of the molten glass are further influenced. The utility model provides a smelting furnace neck water bag which comprises a body, a connecting arm, a buffer plate and a sealing assembly. The partition plate is attached to the side wall of the body. The sealing assembly is arranged on the buffer plate in a covering manner; one end of the sealing assembly is connected with the connecting arm; the other end of the sealing assembly is connected with the body; according to the utility model, the body can be protected through the buffer plate, abrasion during installation is reduced, and molten glass can be prevented from flowing into a crack between the body and the inner wall of the furnace body through the sealing assembly, so that the flowing path and speed of the molten glass are avoided, and the homogenization and clarification effects of the molten glass are improved.

The utility model relates to a kind of injection molded part pin performance detection device, belong to the technical field of injection molded part detection equipment.It is sequentially transported to each detection station by transfer gripper assembly with injection molded part, the end face and side of injection molded part containing pin are sequentially detected in comprehensive manner in conduction, height and location degree, and the two-dimensional code for tracing is marked to qualified product, avoid artificial misjudgment, realize efficient, accurate quality detection and data management.

This invention relates to the field of interference source analysis technology, and provides a method and system for interference source analysis in partial discharge measurement of large oil-filled equipment, comprising: Step 1, acquiring the original acoustic signature signal of the large oil-filled equipment in operation; Step 2, preprocessing the original acoustic signature signal, including filtering, multi-stage downsampling, and acoustic signature data enhancement; Step 3, extracting the acoustic features of the preprocessed acoustic signature signal, including time-domain features, frequency-domain features, and time-frequency-domain features; and then performing multi-domain acoustic feature fusion; Step 4, based on the acoustic features, constructing a multi-domain feature-driven interference source classification model to identify and classify different types of interference sources; Step 5, based on the interference source identification results, suppressing interference in the original acoustic signature signal and extracting effective partial discharge signals. This invention can perform interference source analysis more effectively.

This invention discloses an automatic food bagging device, belonging to the field of food bagging technology. It includes: a material box, a drive platform, and a base arranged sequentially from top to bottom. A connected feed inlet is fixed to the top of the base, and several connected discharge outlets are evenly spaced along the circumference at the bottom of the material box. The material box is connected to the drive platform, and the drive platform is connected to the base, respectively, by several support columns evenly spaced along the circumference. This invention features several discharge channels and several collection boxes, which increase the discharge speed and thus improve the bagging speed. Simultaneously, a rangefinder measures the accumulation distance of material inside the collection boxes to determine if the material collection meets standards, eliminating the need for contact or pressure, thus extending service life. Furthermore, the upper and lower discharge channels and collection boxes are connected by a flipping drive mechanism and a rotating drive mechanism, enabling automatic material unloading and automatic resetting, preventing spillage and reducing enterprise costs.

The utility model discloses an atomization device. The atomization device comprises a shell, an atomization main machine, a suction nozzle and a sealing piece. The atomization main machine comprises a liquid storage space with an open end and an atomization assembly with an atomization channel; the sealing piece is provided with an air outlet channel connected with the atomization channel in a sealed mode and a liquid injection channel communicated with the liquid storage space. The shell comprises a main body part installed in the main body part and a connecting part. The connecting part at least partially abuts against the side, back on to the atomization main machine, of the sealing piece so that the sealing piece can seal the open end, and an installation space is formed in one side of the sealing piece. The suction nozzle is detachably installed in the installation space and comprises a suction channel communicated with the outside. When the suction nozzle is installed in the installation space, the suction channel is connected with the air outlet channel in a sealed mode, and the suction nozzle seals the liquid injection opening of the liquid injection channel. When liquid injection is needed, the suction nozzle is taken down, and the liquid injection channel is opened, so that liquid injection can be quickly carried out; after liquid injection is completed, the suction nozzle can be installed, the liquid injection channel is closed again, and the liquid injection device has the advantages of being high in liquid injection speed, good in sealing performance and the like.