70results about How to "Efficiency is not affected" patented technology

The invention relates to the technical field of data processing, in particular to a data transmission method and system for industrial edge gateways, and the method comprises the steps: obtaining industrial production equipment data, constructing a data queue, and obtaining the busy degree of each edge gateway based on the operation data of the data queue; according to the busy degree of each edge gateway, obtaining transmission results after the different data queues are transmitted to the cloud server, and calculating feedback rewards transmitted by the edge gateways by selecting the different data queues; and on the basis of the feedback rewards, using a UCB algorithm to calculate the confidence coefficient of each queue for transmitting data to the cloud server, and adjusting the data queue through which the edge gateway passes when transmitting the data to the cloud server according to the confidence coefficient. According to the method, the data transmission strategy is dynamically adjusted by monitoring the busy degree of the edge gateway and the transmission result of the data queue in real time, and rapid changes of task frequency, data volume and network conditions are better adapted, so that the data transmission efficiency is improved.

The invention belongs to the field of thermostatic bath cavities, and provides a thermostatic bath cavity structure and a magnetic type surface temperature sensor calibration system. Wherein the thermostatic bath cavity structure comprises a stirring cavity and a working cavity which are mutually independent; connecting channels are arranged at the upper parts and the lower parts of the stirring cavity and the working cavity; a temperature sensor is arranged in each connecting channel and is used for detecting the temperature field change condition in the stirring cavity and transmitting the temperature field change condition to the controller; the top of the working cavity is connected with a sunken flange plate, a working surface is arranged in the sunken flange plate, and at least two detected sensor stations are distributed on the working surface; a stirring mechanism, a heating coil and a refrigerating coil are arranged in the stirring cavity; the controller is used for controlling the working states of the stirring mechanism, the heating coil and the refrigerating coil according to the temperature field change condition in the stirring cavity, so that the temperature field in the stirring cavity is uniformly maintained at a set temperature.

The invention discloses a memory allocation method and device for a model in a heterogeneous system, a medium and a product in the technical field of computers. According to the method, the corresponding processing process of the target task executed by each network layer in the model is creatively regarded as each processing stage, and then memory allocation is performed for each processing stage; on the premise of considering the local memory access total time delay of the target computing power equipment aiming at the specific task execution process, the memory access data volume of the specific task execution process and the local memory space of the target computing power equipment, reasonable memory allocation is realized aiming at each processing stage of the task; it is ensured that memory allocation does not affect efficiency and performance of the currently executed task as much as possible, and task processing efficiency is improved.

The invention provides a perovskite crystal silicon laminated cell and a preparation method, the laminated cell comprises a perovskite top cell and a crystal silicon bottom cell, an overlapping area of the two cells is a working area of the laminated cell, and a non-overlapping area of the two cells is a non-working area of the laminated cell; and a top electrode welding strip and a bottom electrode welding strip are arranged at the bottom of the crystalline silicon bottom battery, correspond to the non-working area and are respectively connected with the perovskite top battery and the crystalline silicon bottom battery through a top electrode and a bottom electrode which are independent from each other. The top electrode and the bottom electrode are led to the same side of the laminated cell, so that the welding process of the laminated cell assembly can be simplified, and the preparation efficiency is improved; the positions of the top electrode welding strip and the bottom electrode welding strip correspond to the non-working area of the laminated cell, so that high temperature at a welding spot can be effectively prevented from directly contacting the working area of the laminated cell.

The invention relates to the technical field of pulverized coal selecting devices, and discloses an efficient centrifugal pulverized coal selecting device and a method thereof.The efficient centrifugal pulverized coal selecting device comprises a third separator shell, and a second separator shell is installed at the top end of the third separator shell. According to the efficient centrifugal pulverized coal selecting device and method, under the same primary air flow working condition, when the efficient centrifugal pulverized coal selecting device is adopted, the internal flow field of a coal mill is uniform, the flow speed is not larger than 10 m / s, and resistance is small. A rotor of a traditional dynamic powder selecting device serves as a resistance belt, the internal resistance is large, the peripheral flow speed is about 20 m / s, and abrasion is extremely large. According to the efficient centrifugal powder selecting device, an air suction type rotor with arc-shaped bionic blades is adopted, drainage is achieved through a wing-shaped front guide device, air suction is forcibly conducted below the rotor, and the efficient centrifugal powder selecting device faces a larger ascending air powder section below; a rotor of a traditional dynamic powder selecting device rotates to form a resistance belt, an air inlet channel and a coarse powder discharging channel of the traditional dynamic powder selecting device coincide in the annular peripheral area of the rotor in a hedging mode, and therefore the volume strength of the efficient centrifugal powder selecting device is much larger than that of the traditional powder selecting device.

The invention discloses a lithium iron phosphate modified material as well as a preparation method and application thereof, and belongs to the technical field of battery materials. The lithium iron phosphate modified material provided by the invention comprises lithium iron phosphate particles, a coating layer coating at least part of the surface of the lithium iron phosphate particles, and a carbon layer coating at least part of the surface of the coating layer, the coating layer comprises a transition metal doped layer, and the transition metal doped layer contains structural defects. On the basis of improvement of a lithium iron phosphate material, the transition metal doped layer is introduced, doped transition metal elements can generate holes or electrons in the material, and then structural defects such as oxygen defects are formed, so that absorption of the material to oxygen is promoted, and adverse effects caused by oxygen release of a lithium supplementing agent are reduced.

The invention relates to a multi-stage centrifugal pump rotor dynamics optimization method and device, a medium and equipment. The method comprises the steps that geometric parameters and position parameters of parts influencing the hydraulic efficiency of a multi-stage centrifugal pump are obtained; establishing a pump rotor geometric model; establishing a pump rotor grid model; establishing a pump rotor system finite element calculation model; carrying out orthogonal table design on the geometric parameters and the position parameters to form a typical characteristic parameter orthogonal table, and calculating the first-order inherent frequency of the pump rotor system under each characteristic parameter combination; determining the upper limit and the lower limit of each of the geometric parameters and the position parameters according to known conditions, and generating a full-factor test orthogonal table through software; importing the full-factor test orthogonal table and the first-order inherent frequency of the pump rotor system into a BP neural network for fitting; and the fitted BP neural network is imported into a Matlab genetic algorithm calculation program for optimization, and a geometric parameter and position parameter combination enabling the first-order inherent frequency of the pump rotor system to be maximum is obtained.

The invention provides a method and device for secure communication between a client and a server, and the method comprises the steps: the server generates a public key and a private key, and transmits the public key to the client; the client obtains hardware information of local equipment and generates a machine code character string; randomly generating random characters with set digits, and combining the machine code character string with the random characters to serve as encryption seeds; generating an encryption key according to the encryption seed; the client encrypts the encryption key through a public key and then sends the encryption key to a server, and the server decrypts the encryption key through a private key to obtain the encryption key; the client encrypts the request data according to the encryption key to obtain encrypted data, and signs the encrypted data; the client sends the signature and the encrypted data to the server; the server receives the signature, verifies the signature, decrypts the encrypted data by using the encryption key after the verification is passed, processes the data according to the request data, and sends return data; and the safety of data communication is greatly improved.

The utility model relates to the field of pumps, in particular to an anti-cavitation device which comprises an outer ring and an inner ring which are coaxially arranged, a backflow channel allowing media to flow back is formed between the outer ring and the inner ring, and the tail end of the outer ring is bent inwards in the radial direction to form an inverted-hook-shaped guide ring in the backflow direction of the backflow channel. The bending direction of the guide ring is opposite to the backflow direction of a medium in the backflow channel, and a gap exists between the tip end of the guide ring and the tail end of the inner ring so that the medium in the backflow channel can be discharged. According to the centrifugal pump, the cavitation phenomenon of the centrifugal pump is greatly reduced, and the stability of the centrifugal pump during operation is improved. The utility model further provides the centrifugal pump.

The invention belongs to the technical field of stepped efficient functions, and discloses an oil field well head heating and deicing system and a using method.The oil field well head heating and deicing system comprises a solar heat collector and a well head heating cover, the well head heating cover is provided with a heat preservation shell, and well head equipment and fused salt heat storage equipment are arranged in the heat preservation shell; the fused salt heat storage equipment is provided with an inlet pipeline and an outlet pipeline; the solar heat collector is respectively connected with the inlet pipeline and the outlet pipeline through pipelines; the fused salt heat storage equipment is provided with a heat preservation layer. Heat storage fused salt is arranged in the heat preservation layer, and gaps are reserved between the heat storage fused salt and the top and the bottom of the heat preservation layer; a heat exchange pipeline is inserted into the heat storage fused salt, and the two ends of the heat exchange pipeline extend out of the top and the bottom of the heat storage fused salt correspondingly; the inlet pipeline extends into the top of the insulating layer, and the outlet pipeline extends into the bottom of the insulating layer. Fused salt energy storage equipment is used for being coupled with the solar heat collector, heat storage and heat dissipation are integrated, and long-term uninterrupted efficient heat exchange of the system without manual operation is achieved.

The present invention relates to an infrared temperature measuring device and a gas stove using the infrared temperature measuring device, wherein the infrared temperature measuring device includes an infrared temperature measuring sensor for measuring temperature, and is characterized in that: it also includes a shell, the infrared temperature measuring sensor is installed in the shell, a transmission hole is opened on the surface of the shell, an anti-fouling sheet capable of transmitting infrared light is arranged in the transmission hole, a detection channel connected to the transmission hole is arranged in the shell, and the infrared temperature measuring sensor is arranged in the detection channel; the detection channel is straight and has an angle α with the horizontal plane, 18°<α<23°; a collimator is also arranged in the detection channel, which is located in front of the infrared temperature measuring sensor and is used to increase the measuring distance of the infrared temperature measuring sensor. Compared with the prior art, the present invention does not need to open a hole in the inner ring of the burner, can reduce most of the flame radiation interference, and ensure that the infrared temperature measuring sensor can still have a stable measurement result and a relatively accurate test accuracy under the condition of flame interference.

The invention provides a method for recycling waste acid in a steel cord electroplating process. The method comprises the following steps: collecting waste acid discharged by an electrolytic pickling tank; freezing crystallization treatment is performed at low temperature, ferrous sulfate is separated out through crystallization, and pretreated acid liquor is obtained after recovery; filtering the acid liquor to remove oil sludge impurities in the acid liquor, and storing at normal temperature; after secondary filtration of the acid liquor, part is pumped out and diluted with water, the concentration of iron ions and organic matter in the acid liquor is reduced, the acid concentration is controlled, and diluted acid liquor is obtained; concentrated sulfuric acid and diluted acid liquor are used for reconfiguration, and new dilute sulfuric acid is obtained; and dilute sulfuric acid is added into the electrolytic pickling tank for electrolytic pickling operation. According to the method, ferrous sulfate can be recycled from the waste acid, resource utilization of the waste acid is achieved, meanwhile, a dilute sulfuric acid preparation method is optimized, precipitates, impurities and acid liquor turbidity are reduced, the quality of prepared electrolytic pickling sulfuric acid is improved, the surface quality of a steel wire and the efficiency of an electrolytic polar plate and a heat exchanger are not affected, recycled waste acid is treated and utilized, and the economic benefit is increased. And emission and pollution are reduced.

Embodiments of the present disclosure relate to a method and apparatus for recommending application functions, a device and a storage medium. The method for recommending application functions comprises: in response to a triggering operation on a target page of an application, determining, based on user behavior data of a target user in a historical time period, function use information of the target user on a search function module in the application; if the function use information is greater than a preset information threshold, displaying a function label of the search function module at a function display position of the target page; the function label is used to trigger the search function module. According to the embodiments of the present disclosure, personalized recommendation of the search function is realized according to the use of the search function in the application, so that users who prefer the search function can more conveniently see and use the search function at the function display position of the target page, thereby shortening the search operation path and improving the search efficiency.

The invention relates to the technical field of film pasting equipment, in particular to a quick feeding device for QLED display screen film pasting equipment, which comprises a film feeding mechanism and a stand column positioned on one side of the film feeding mechanism, a motor is fixedly connected to the upper end of the stand column, a rotating plate is fixedly connected to the output end of the motor, an air cylinder is fixedly connected to the upper end of the rotating plate, and a sleeve block is fixedly connected to the bottom end of the air cylinder. According to the quick feeding device for the QLED display screen film pasting equipment, when a sleeve block moves downwards, a film is adsorbed and moved out of a film conveying mechanism through an air spraying opening, when the sleeve block moves upwards, air is sprayed out of the air spraying opening, then pressure can be generated on the film, and when the sleeve block moves upwards, connecting rods on the two sides enable two arc-shaped blocks to rotate upwards, so that the two arc-shaped blocks rotate upwards; therefore, when the air nozzles eject air, the film can be extruded and attached from the middle to the two sides, the film cannot deviate, the notch of the air nozzle close to the middle faces the middle position of the placing table on the lower side, and bubbles in the middle of the film can be completely expelled out.

This invention discloses a high-temperature solar thermal energy storage power generation system for emerging energy generation, belonging to the field of high-temperature solar thermal energy storage power generation technology. The system includes a solar field heat collection unit, a high-temperature fluid circuit, a generator set, a converter, and a transformer. An active common-mode cancellation circuit is connected in parallel between the positive and negative DC bus of the converter. The system is also equipped with a temperature sensor group, a common-mode voltage sensor, and a controller. The controller calculates the common-mode equivalent impedance based on the temperature signal of the high-temperature conductive fluid and calculates the compensation voltage based on the detected transient common-mode voltage. It drives the active common-mode cancellation circuit to output a compensation voltage with opposite polarity and equal amplitude to the transient common-mode voltage and injects it into the common-mode coupling node. This suppresses the common-mode voltage from the electrical conversion source of the converter, cuts off the high-frequency leakage current path formed by the parasitic capacitance coupling between the high-temperature conductive fluid and the pipe wall, suppresses the electrochemical corrosion of the pipeline of the high-temperature solar thermal energy storage system, and extends the service life of the system. It is suitable for high-temperature solar thermal energy storage grid-connected power generation systems.

The invention relates to the technical field of dry-mixed mortar storage, in particular to a finished product bin for dry-mixed mortar, which comprises a storage tank and is widely applied to dry-mixed mortar production lines in the fields of buildings, traffic, water conservancy and the like. And a high-quality dry-mixed mortar material is provided for projects such as road construction, bridge construction, dike reinforcement and the like. However, in the bagging process of dry-mixed mortar in a storage bin, due to the fact that the dry-mixed mortar is a dust material, along with bagging and disturbance of airflow, the dry-mixed mortar often overflows to different degrees and is attached to the surfaces of a packaging bag and surrounding equipment components, waste and dust pollution are formed, and the problem of dust pollution is solved. In addition, the bagged dust mortar is continuously assisted and carried by operators in the subsequent transfer process, dust overflowed and attached to a packaging bag in the early stage can also cause additional harm to the operators, normal production and bagging operation efficiency of the dry-mixed mortar is affected, and production safety is also reduced.

This invention relates to the field of photovoltaic ribbon technology, and discloses a preparation apparatus and method for black photovoltaic ribbon. The preparation apparatus includes an unwinding assembly, a blackening assembly, a drying assembly, and a winding assembly. The blackening assembly includes a horizontal plate, a mold support on the horizontal plate, and a mold assembly on the mold support. The mold assembly includes a mold and a paint application section. A horizontal strip-shaped hole is provided at the center of the mold. A vertical cylindrical flow channel is provided at the center of the top of the mold, extending downwards to communicate with the horizontal strip-shaped hole. The paint application section includes a fixing plate and a paint application tube penetrating the fixing plate. The upper end of the paint application tube is a paint inlet, and the lower end is a paint outlet, communicating with the cylindrical flow channel. A paint box is provided above the mold assembly, with the paint box's outlet communicating with the paint inlet. The black photovoltaic ribbon prepared by this invention has a uniform black ink coating, matching well with black solar cells; and the back of the black photovoltaic ribbon does not have ink adhering to it, thus not affecting the welding of the grid lines on the solar cells.

This invention provides a two-way plastic stacking barrel, relating to the technical field of plastic packaging barrels. The two-way plastic stacking barrel includes a barrel body, a handle, and a barrel opening component. The upper part of the barrel body has a handle groove, a barrel opening groove, a raised strip, and a top flat surface. The lower part of the barrel body has a groove, symmetrical side grooves, and a bottom flat surface. The handle is disposed within the handle groove and connected to the barrel body; the barrel opening groove communicates with the handle groove; and the barrel opening component is disposed within the barrel opening groove. The groove is adapted to the raised strip, the symmetrical side groove communicates with the groove, and the bottom flat surface is adapted to the top flat surface. This two-way plastic stacking barrel solves the technical problem of existing plastic packaging barrels having poor stacking stability and flexibility, affecting the safety and efficiency of material storage and transportation.

The invention provides a method for predicting wall rock caving in a roadway tunneling process, and relates to the technical field of roadway caving disaster prediction. According to the method for predicting the wall caving of the wall surrounding rock in the roadway tunneling process, the wall caving possibility and the wall caving depth can be accurately predicted through on-site sampling, indoor testing, theoretical calculation and combination of stress and energy criteria in the tunneling process, all parts of the wall surrounding rock of the roadway wall are predicted, and the prediction range is wide; the prediction method is simple in process implementation and high in prediction analysis efficiency, real-time prediction of roadway side caving can be basically realized, and factors such as geological condition change do not influence prediction precision and efficiency; by means of the prediction method, the rib caving area can be prevented and treated, and the safety and continuity of equipment such as a digging and anchoring all-in-one machine in coal mine roadway digging and supporting operation are effectively guaranteed.

The utility model discloses a high-solid-content circulating pulping system which comprises a powder feeding system, a liquid feeding system, a multi-screw extruder and a circulating demagnetizing and dispersing system, and the discharging end of the powder feeding system and the discharging end of the liquid feeding system are respectively connected with the feeding end of the multi-screw extruder. And the discharge end of the multi-screw extruder is connected with the feed end of the circulating demagnetizer. According to the high-solid-content circulating pulping system, slurry conveying kneading and circulating demagnetizing dispersion are achieved through the multi-screw extruder and the circulating demagnetizing dispersion system, qualified slurry is produced, and the problems that a traditional homogenizing system circulating pulping system is weak in kneading effect and cannot meet the high-solid-content requirement are solved.

The present invention discloses a toothed elastic transmission device for a tunnel boom boring machine, comprising two elastic opening and closing rotary digging wheels symmetrically installed in a shovel bucket, and the two elastic opening and closing rotary digging wheels are arranged along the lateral direction of the shovel bucket, and a chain plate type conveying unit is arranged at the discharge end of the shovel bucket, and the chain plate type conveying unit is respectively connected to the two elastic opening and closing rotary digging wheels through two wheel transmission units, and lateral guide units are respectively arranged on both sides of the chain plate type conveying unit, and the two lateral guide units are both connected to the chain plate type conveying unit, and the guide units on both sides are connected to the body of the boom boring machine. The present invention can efficiently remove waste rocks, debris, etc. of different volumes generated by excavation, does not affect the efficiency of the excavation operation, and improves the safety of the removal operation and the excavation operation. The present invention is applicable to the technical field of removing waste rocks, debris, etc. in tunnel excavation construction.

This utility model relates to the field of electronic circuit technology, specifically to an over-temperature protection circuit for a power-free voltage clamping element. It includes: a voltage clamping element; and a normally open temperature control switch, the temperature-sensing part of which is in close contact with the voltage clamping element, and its contacts are connected in parallel with the voltage clamping element. When the voltage clamping element heats up to the activation temperature of the temperature control switch due to current flow, the temperature control switch closes, and the current is shunted through the temperature control switch, causing the voltage clamping element to stop working and cool down. When the temperature drops to the reset temperature, the temperature control switch opens, and the voltage clamping element resumes operation. This utility model ensures that the voltage clamping element can normally absorb transient overvoltages by opening the temperature control switch. When continuous overvoltage or frequent surges cause the clamping element temperature to rise to the activation threshold of the temperature control switch, the current is shunted through the temperature control switch, and the clamping element stops working and cools down due to the reduced current. When the temperature drops to the reset threshold, the temperature control switch opens, and the clamping element resumes operation, forming a cyclic protection.

The utility model discloses a microcomputer control electro -hydraulic pressure testing machine belongs to pressure testing machine technical field, including liquid accumulator, the liquid accumulator includes condensing board and liquid storage tank body, and liquid storage tank body is passed through oil pipe and is linked with hydraulic pump, and the driving wheel of hydraulic pump is fixedly connected with motor. The utility model can realize no longer install radiator or external forced cooling device, avoided the problem of high energy consumption, complex structure, reduced equipment maintenance difficulty, and the liquid storage tank no longer only relied on single oil cavity, avoided the overall oil temperature rising situation caused by the mixing of cold and hot oil in the liquid storage tank, controlled the temperature of hydraulic oil in the liquid storage tank at the suitable temperature, prevented the high oil temperature heat of hydraulic oil from being transferred to the hydraulic pump, so reduced the high temperature shutdown phenomenon of hydraulic pump, and the overall efficiency was guaranteed.

The invention discloses a tooth-shaped elastic transmission device of a tunnel cantilever tunneling machine, which comprises two elastic opening and closing type rotary excavating material wheels symmetrically arranged in a shovel hopper, the two elastic opening and closing type rotary excavating material wheels are arranged along the transverse direction of the shovel hopper, and a chain plate type conveying unit is arranged at the discharge end of the shovel hopper. The chain plate type conveying unit is in transmission connection with the two elastic opening and closing type rotary excavating material wheels through the two wheel type transmission units respectively, the two sides of the chain plate type conveying unit are provided with the side material guiding units respectively, the two side material guiding units are both in transmission connection with the chain plate type conveying unit, and the two side material guiding units are connected with a machine body of the cantilever heading machine. According to the device, waste stone, disintegrating slag and the like of different volumes generated by tunneling can be efficiently removed, the efficiency of tunneling operation is not affected, and meanwhile the safety of removing operation and tunneling operation is improved. The device is suitable for the technical field of removal of waste stone, disintegrating slag and the like in tunneling construction.

This application discloses a power supply device, a resonant converter circuit, and a control method thereof. The circuit includes: an inverter circuit, a resonant circuit, a rectifier circuit, a switch, and a second inductor. The inverter circuit is connected to the resonant circuit and is used to convert direct current (DC) into alternating current (AC) and output it to the resonant circuit. The resonant circuit is connected to the rectifier circuit and is used to resonate and convert the AC power and output it to the rectifier circuit. The rectifier circuit is used to output DC power. The resonant circuit includes a first inductor and a first capacitor, which are connected in series with the first inductor, the first capacitor, and the second inductor. The switch is connected in parallel with the second inductor, and the rectifier circuit is connected to both ends of the second inductor. Through this application embodiment, the output voltage gain of the resonant converter can be increased without affecting the efficiency of the resonant converter, thereby extending the hold-up time.

An apparatus (1) for applying a threaded insert (9) to a receiving body (90) comprises a frame (10), a motor assembly (2), a drive shaft (4) and a working head (3). The insert (9) has a flat head (91) and a threaded stem (92). The shaft (4), driven by the motor assembly (2), moves the working head (3) which supports a tool (8) having a retaining portion (81) and a threaded portion (82). Linear motion means (51) translate the shaft (4) along a working axis (X) between two engagement configurations of the working head (3): a first configuration (A) in which rotation of the working head (3) can screw the tool (8) into / from the insert (9); and a second configuration (B) in which translation of a pulling portion (35) of the working head (3) can pull the insert (9).

The invention discloses a method for improving the operation efficiency of a ship lift approach channel auxiliary lock chamber, and belongs to the technical field of approach channel hydraulics. The method comprises the following steps that S1, a water level gauge is arranged in a key area in a ship lift approach channel; s2, reading a non-constant-current water level fluctuation value H in a key area in the storage approach channel in real time; s3, calculating the fluctuation amplitude of the non-constant current water level in the key area in the approach channel of the ship lift hour by hour; and S4, comparing operation scheduling limits of the ship lift, and determining whether the auxiliary lock chamber needs to be put into operation or not. According to the method for improving the operation efficiency of the auxiliary lock chamber of the ship lift approach channel, the problems that in the prior art, frequent operation of the auxiliary lock chamber consumes long time, the navigation efficiency is greatly influenced, and the metal structure of a fixed roll type hoist is greatly shortened due to repeated use of an auxiliary lock head working door can be effectively solved.

This utility model belongs to the technical field of filter press equipment, specifically relating to a frame plate filter press with a cake-removing air passage. A frame plate filter press with a cake-removing air passage includes a main support, with a filter press frame and a pressing frame at each end, and a main beam between the filter press frame and the pressing frame; several filter press plate assemblies are arranged between the filter press frame and the pressing frame, and the filter press plate assemblies are mounted on the main beam; the filter press frame has four liquid guiding channels and one mud guiding channel, the pressing frame has a hydraulic plate, and the hydraulic plate has a hydraulic pump; the filter press plate assembly includes a filter press plate, with liquid guiding holes at each of the four corners and a mud guiding hole at the center of the filter press plate; filter press grooves are provided on both sides of the filter press plate, and mud pushing plates are hinged to the filter press grooves; the filter press plate has an air passage inside, and several air ports are provided at the bottom of the filter press groove, all connected to the air passage, with one end of the air passage opening to the top of the filter press plate.

The present invention discloses a ducted UAV noise reduction device based on blade tip acoustic metamaterial, comprising: a UAV body, the UAV body comprising a duct, a first propeller and a second propeller, the first propeller and the second propeller being coaxial and arranged inside the duct at intervals along the axial direction of the duct; a noise reduction unit, mounted on the inner side wall of the duct, the interior of the noise reduction unit being a curved channel of equal cross-section, the channel being connected to the flow channel formed by the duct; wherein the channel can generate secondary noise under the excitation of the approximately periodic pressure pulsation generated by the rotating first propeller and the second propeller, the amplitude of the secondary noise at the blade frequency or its harmonic frequency is close to the amplitude of the blade frequency or its harmonic noise of the UAV body, and the phase is close to anti-phase and cancels each other, thereby reducing the blade frequency or its harmonic noise of the UAV body. The present invention has the advantages of simple structure, low cost, and no influence on the efficiency of the UAV.

The invention discloses a communication method and device of a vehicle-mounted network, electronic equipment and a storage medium, the communication method of the vehicle-mounted network can be applied to the technical field of vehicle-mounted network communication, and the method comprises the following steps: in response to a communication request of current network equipment for a target vehicle-mounted network, collecting physical characteristics of the current network equipment; based on the current configuration state of the target vehicle-mounted network and the current network equipment, judging whether the communication request meets a preset communication authentication condition or not; under the condition that the communication request meets a preset communication authentication condition, performing communication authentication on the physical characteristics of the current network equipment based on the authorized physical characteristics corresponding to the target vehicle-mounted network to obtain an authentication result; the authentication result indicates whether the current network equipment has the qualification of establishing communication with the target vehicle-mounted network or not; the communication request is processed based on the authentication result. According to the invention, the communication security of the vehicle-mounted network is improved, the communication efficiency of the vehicle-mounted network is not affected, and the protection cost of the vehicle-mounted network is reduced.