3294results about How to "Prevent leakage" patented technology

The utility model belongs to the technical field of carbon molecular sieve production equipment, and discloses a flower mud material crushing conveyor line which comprises crushing equipment, a bottom belt conveyor, an inclined lifting belt conveyor and a vibrating screen, a sunken main pit is formed in the workshop ground of a flower mud crushing station, the crushing equipment is installed in the main pit, and the inclined lifting belt conveyor is installed in the main pit. A feeding hopper of the crushing equipment is removed towards the outer side wall, and the bottom of the feeding hopper is connected through a horizontal steel plate, extends and is connected to the workshop ground in a lap joint mode. The bottom belt conveyor is horizontally connected below a discharge port of the crushing equipment, the bottom end of the inclined lifting belt conveyor is connected at the discharge end of the bottom belt conveyor, and the high end of the inclined lifting belt conveyor inputs crushed flower mud materials to a feed port of the vibrating screen. According to the flower mud material crushing conveying line, crushing equipment is installed in a pit mode, the feeding difficulty is lowered, and the operation safety is improved.

The invention discloses a yielding crystallizer for an electroslag smelting casting three-dimensional variable curved surface casting and an electroslag smelting casting method, and belongs to the field of electroslag smelting casting. The receding crystallizer comprises a crystallizer body formed by combining a plurality of crystallizer blocks, internal molded surfaces of the crystallizer body are combined to form a crystallizer cavity, and the crystallizer cavity is used for containing molten metal and forming a casting with a three-dimensional variable curved surface; the receding structure is arranged on at least one crystallizer sub-block and is configured to allow the crystallizer sub-block to move in the preset direction in the solidification and shrinkage process of the casting so as to avoid shrinkage deformation of the casting; and the slag stopping structures are arranged between the adjacent crystallizer blocks and are used for sealing gaps generated by displacement after the crystallizer blocks are subjected to yielding displacement, so that slag leakage is prevented. The receding crystallizer can automatically receding when hindering deformation of a casting, space needed by metal shrinkage is provided in the electroslag casting process, and the finished product quality of the casting in the complex shape is improved.

The invention discloses an assembly type building stair mold, and relates to the technical field of stair molds, the assembly type building stair mold comprises a mold mechanism, the side face of the mold mechanism is provided with a transverse steel bar limiting mechanism, and the transverse steel bar limiting mechanism is used for limiting and fixing transverse steel bars in a prefabricated stair. According to the longitudinal reinforcement limiting mechanism, the height of a clamping head is accurately adjusted through a third mounting bolt, the clamping head can be flexibly selected according to the diameter of a longitudinal reinforcement, the mounting height and position of the longitudinal reinforcement can be accurately controlled, the overall positioning accuracy of a reinforcement framework is guaranteed, and then the mechanical property of the prefabricated stair is improved; the sleeve plays a role in protecting the end, inserted into the mold mechanism, of the third mounting bolt, it is avoided that concrete adhesion affects bolt disassembly, meanwhile, due to the detachable design of the third mounting bolt and the modular structure of the steel bar limiting mechanism, the demolding difficulty is lowered, damage to stairs after a component is formed is reduced, and the demolding efficiency and the finished product quality are improved.

The invention discloses a federal recommendation privacy protection method based on ring signature and selective aggregation, which realizes anonymization privacy protection and selective aggregation in a federal learning process through an innovative double-server architecture and a hierarchical security mechanism. The method comprises the following steps: 1) deploying an aggregation server and a security server in a system initialization stage, and completing parameter initialization and key distribution; 2) the client executes local model training, and anonymization privacy protection uploading is realized by adopting a ring signature technology; 3) the security server performs selective aggregation of credibility verification, and completes grouping and parameter fusion based on user similarity; and 4) ensuring the completeness and source credibility of model updating through a hierarchical security parameter distribution mechanism. While the recommendation precision is ensured, the user identity leakage and privacy tracking are effectively prevented, the comprehensive security guarantee is provided for the federal recommendation system, and the method has the advantages of low calculation overhead and high communication efficiency.

The invention discloses a preparation method and antibacterial application of a naphthothiadiazolyl photosensitizer, and belongs to the technical field of biomedical antibacterial materials. The naphthothiadiazole-based photosensitizer provided by the invention overcomes the problem that the existing commercial photosensitizer gathers and quenches the active oxygen efficiency, and meanwhile, the antibacterial photosensitive polymer prepared based on the novel naphthothiadiazole-based photosensitizer has the unique advantages that the structure is stable, photosensitizer micromolecules are not easy to leak and the antibacterial effect is long-acting; the construction of the antibacterial polymer coating on the surface of the medical instrument in the future has important clinical application potential. The naphthothiadiazolyl photosensitizer provided by the invention has good photodynamic killing performance on drug-resistant bacteria MRSA (Methicillin Resistant Staphylococcus Aureus).

The invention discloses a chip security access control method, device and system and a chip. The control method comprises the following steps: when the chip is coupled with access equipment through a debugging interface, detecting an access request through the debugging interface and acquiring an access object of the access request; obtaining a first verification key or a second verification key based on an access object of the access request, and executing first verification or executing second verification based on the first verification; wherein the first verification key and the second verification key are generated based on a unique user identifier of an electronic device of the chip, the first verification key is associated with the first safety circuit, and the second verification key is associated with the second safety circuit; and controlling the first safety circuit or the second safety circuit to be switched on or switched off according to a result of the first verification or the second verification.

The invention relates to a quantum key management method and system for satellite internet biological characteristics, and the method comprises the following steps: carrying out the registration of biological characteristics and the initialization of communication protocol parameters for a user terminal which is accessed for the first time; for the registered user terminal, before initiating communication each time, binding the real-time biological characteristics with the quantum key, and carrying out encrypted transmission of the session key by using the bound quantum key, so as to carry out encrypted transmission of satellite internet transmission data by using the session key; and in the encryption transmission process of the satellite internet transmission data, according to a preset period, performing satellite link security level adjustment and quantum key dynamic updating. According to the invention, identity authentication and terminal authentication in a high-delay and narrow-bandwidth application scene can be realized, the security problems of identity counterfeiting, key leakage and the like are solved, and the method can be applied to satellite internet scenes such as emergency communication, field operation and the like, and has the advantages of strong compatibility, low deployment cost and the like.

The invention relates to a cluster unmanned aerial vehicle communication method based on a multi-dimensional key encryption and decryption algorithm. The method comprises the following steps: acquiring unique identifiers of an unmanned aerial vehicle array and marshalling; extracting a single-user key of the unmanned aerial vehicle in the target group, and obtaining a key element by using a multi-dimensional key algorithm; generating an action instruction according to a preset coding rule, encrypting the action instruction, and combining the action configuration classification area to obtain a remote control instruction data packet; transmitting the remote control instruction data packet through a broadcasting mechanism, and receiving the remote control instruction data packet by the unmanned aerial vehicle through a monitoring mechanism; filtering and analyzing the received data packet to obtain a configuration data unit matched with the unmanned aerial vehicle marshalling; extracting a key element based on the configuration data unit, and calculating to obtain an original key; decrypting the action element encryption value to restore the action instruction, and executing the instruction after verification; the execution process of the action instruction is monitored in real time, and abnormal conditions are processed; the cluster unmanned aerial vehicle communication method using multi-dimensional key encryption and decryption is realized.

The application relates to the technical field of wastewater treatment equipment, in particular to a zero-emission multistage wastewater treatment device for industrial high-salinity wastewater, which comprises a base, a fixing frame fixedly installed on the base and a supporting limiting frame fixedly installed on the fixing frame, the supporting limiting frame is slidably connected with a heat exchange box, the front end face of the fixing frame is provided with limiting assemblies corresponding to the heat exchange box on both sides, a sedimentation tank and a core treatment tank are installed on the fixing frame from top to bottom and located at the bottom of the heat exchange box, the heat exchange box, the sedimentation tank and the core treatment tank are sequentially communicated through connecting channels, a feeding pipe is arranged on the side wall of the sedimentation tank, the sealing assembly is driven to rotate by a motor-driven screw rod, the extrusion frame is driven to slide along the guide column, the pressure of the extrusion frame on the third sealing frame can be automatically adjusted, the extrusion plate can be tightly combined with the third sealing frame, the pressure is uniformly distributed, the traditional manual sealing adjustment mode is replaced, and the sealing reliability is further improved.

The invention discloses a roadway tunneling and conveying all-in-one machine with impact cutting teeth for assisting rock breaking. The roadway tunneling and conveying all-in-one machine comprises a walking mechanism, a main machine body, a material conveying mechanism, a material receiving mechanism, a multi-dimensional adjusting mechanism, a rotary driving mechanism and a cutting head mechanism. Cutting tooth units distributed along a spiral track are arranged on the surface of the cutting head mechanism, energy storage rebound mechanisms are arranged in the cutting tooth units, impact inertia kinetic energy is stored and released through multi-layer irregular arrangement of balls, secondary rock breaking is achieved, and the cutting efficiency and the hard rock adaptability are improved. The multi-dimensional adjusting mechanism expands the operation range through cooperation of a rotating base, a hydraulic cylinder and a hydraulic telescopic rod. The material receiving mechanism comprises an angle-adjustable material containing plate and symmetrically-arranged material sweeping wheels, the material sweeping wheels buffer a material pushing plate through springs to avoid collision damage, and an auxiliary feeding mechanism is arranged to enhance the material conveying continuity. Impact kinetic energy is recycled, the cutting range is flexible and adjustable, efficient collection and conveying of materials are integrated, and the device is suitable for high-hardness rock stratum roadway tunneling.

The invention relates to the technical field of semiconductor devices, and discloses a wide bandgap power semiconductor device and a preparation method thereof. The method comprises: providing a substrate layer of a first conductivity type; forming a first doped region which is deep into the substrate layer and comprises a plurality of doped layers which are sequentially nested from outside to inside, wherein the doping concentrations of the plurality of doped layers are sequentially increased from outside to inside; forming a second doped region in the doped layer on the innermost side of the first doped region; forming an isolation layer on the first surface; forming a control electrode on the isolation layer; forming a first electrode on the first surface; a second electrode is formed on the second surface of the substrate layer. According to the invention, the first doped region which is located between the substrate layer and the second doped region and has the doping concentration gradually increased from outside to inside is formed through a mode of multiple times of ion implantation, so that transverse electric field constraint is constructed, transverse depletion of a channel region and a short channel effect under the condition of large voltage are inhibited, the channel width is reduced, and the performance of the device is improved. And the device performance and reliability are improved.

The invention relates to the technical field of cross-border data secure transmission, and particularly discloses a semantic analysis-based cross-border data secure transmission method, which comprises the following steps of: dividing a sender credit investigation level through a multi-source credit investigation acquisition and semantic analysis model; the method comprises the following steps: preprocessing to-be-transmitted multi-modal data, and classifying the data through semantic alignment; matching transmission authority according to credit investigation levels and data types, separating transmittable data according to core / non-core data, and performing hierarchical encryption according to sensitive types of the data; data are transmitted through a cross-border private line of a TLS1.3 protocol, a sliding window and a retransmission mechanism are combined, and the integrity is verified by adopting a Hash algorithm. According to the invention, compliance dynamic adaptation is realized, protection precision and reliability are improved, and safety and efficiency are balanced.

The utility model relates to the technical field of automobile connector fixing, and discloses an automobile connector fixing structure which comprises a connecting mechanism, a fixing mechanism and a main body mechanism, the connecting mechanism is located at the top end of the fixing mechanism, the fixing mechanism is located at the top end of the main body mechanism, and the connecting mechanism comprises a first connector. A second connector is connected to the inner wall of the first connector in a sleeved mode, a clamping groove is formed in the outer wall of the second connector, a clamping block is connected to the inner wall of the clamping groove in a clamped mode, and a spring is fixedly connected to the back face of the clamping block. The spring is arranged between the first connector and the clamping block, so that the clamping block can be controlled to contract by extruding the spring, and when the clamping block enters the bottom of the clamping groove, the spring provides support for the clamping block, so that the clamping block can be tightly matched with the clamping groove, and the first connector and the second connector can be stably connected; the connector is prevented from accidentally falling off, and the structural stability of the automobile connector at the connecting part is ensured.

The application discloses a software development package compiling method and device, and relates to the technical field of computers. A specific implementation of the method comprises the following steps: performing encapsulation based on a second programming language on a first type of module of any core component in a software development package, extracting a header file of the first type of module and a header file of a second type of module after the encapsulation to generate a common umbrella header file of the core component; and after compiling core component source code and upper layer component source code in the software development package into an executable file, processing the common umbrella header file of any core component in the software development package, so that the common umbrella header file only contains declaration content configured in advance for the core component. The implementation can effectively reduce the risk of core code leakage.

This application relates to the field of tarpaulin cleaning technology, disclosing a high-strength self-cleaning sunshade tarpaulin, including a tarpaulin, a cylinder, blades, a hollow shaft, a cross-shaped spray frame, spray pipes, first nozzles, cross-shaped pipes, and valves. In use, the water supply equipment is controlled to operate, and water is delivered through multiple hoses into the interior of multiple cross-shaped pipes, ultimately being sprayed out by multiple spray pipes and multiple first nozzles. When water is sprayed from the multiple first nozzles, fine water streams are evenly sprayed onto the tarpaulin surface, carrying dust from the sides of the tarpaulin to the ground. When water is sprayed from the multiple spray pipes, multiple high-pressure water jets are directed at multiple blades. Then, under the push of the reaction force, the multiple cross-shaped spray frame rotates. This ultimately drives the multiple first nozzles to rotate, thereby increasing the spray range and improving the dust removal effect. Because the multiple nozzles are evenly distributed on the sides of the tarpaulin, it is convenient to clean the entire side when the tarpaulin is unfolded.

The present application relates to the technical field of bathroom base plate, particularly relates to a leakproof assembled base plate for integral bathroom, which comprises a bottom support plate, a support outer frame, a supporting unit, a grid frame and a splicing plate, and can solve the following problems of the existing integral bathroom base plate: the gaps between the base plate modules cannot be compensated and sealed, thus water leakage is easy to occur, affecting the use effect; the slope of the base plate module cannot be adjusted, and it is difficult to drain water at the upper end of the base plate module; the present application can adjust the slope of the bathroom base plate by rotating the bolt to drive the positioning column to move up or down, so that the side of the inner bottom wall of the bathroom base plate near the drain gradually inclines downward as a whole, and the water at the upper end of the bathroom base plate flows to the inclined position, so as to accelerate the drainage speed and prevent water storage caused by small slope; the present application can insert the splicing plate between the support rod and the sealing baffle, and the jacking strip can jack up the splicing plate upward, so as to enhance the sealing strength between the splicing plate and the sealing baffle, thereby avoiding water leakage.

The utility model relates to concrete technical field discloses fly ash content concrete's test simulation cabin that can simulate underground environment, including cabin body, the inside bottom wall of cabin body equidistance is opened with a plurality of ponding holes, the outer wall right side of cabin body is fixedly connected with fixed plate, the top wall of fixed plate is fixedly connected with water pump, one end of water pump is communicated in the outer wall right side middle lower portion of cabin body, the other end of water pump is fixedly connected with water pipe, water pipe is communicated in the outer wall right side middle upper portion of cabin body, the inside top wall of cabin body is installed with the shower head equidistance. In the utility model, motor drive connecting shaft rotates, connecting shaft drives gear no.

The utility model discloses a kind of wall column foot support structure, including inclined support plate and the horizontal support plate of the inclined support plate rotary connection, the one end of the inclined support plate away from the horizontal support plate is equipped with hook, the hook is matched with the double steel pipe of the pair of screw rod fixed assembly for fixing wall column formwork;When the hook is hung on the double steel pipe of the pair of screw rod fixed assembly, the one end of the inclined support plate away from the hook is abutted with ground, the one end of the horizontal support plate away from the inclined support plate is abutted with the lower end of the square steel of the pair of screw rod fixed assembly.The utility model realizes wall column foot stable support, effectively prevents leakage, improves construction convenience and economy simultaneously.

The utility model relates to metallurgical waste heat boiler technical field and disclose a kind of high-temperature ash slag removal and temporary storage device suitable for metallurgical waste heat boiler, it include: ash chute, the ash chute includes hopper body, several access doors and several spring supports, the access door is set in hopper body side wall;Floor ash bin, including ash bin body, steel flue interface and sealing door, the steel flue interface is set at the top of sealing door, the hopper body is connected with ash bin body by just flue interface, the sealing door is set in the side wall of ash bin body;Control assembly, it is jointly arranged in the inside of ash chute and floor ash bin.This scheme uses ash chute to collect high-temperature ash slag, enters floor ash bin by high-power electric hoist driving double flap valve control ash slag, realizes closed discharge, is linked and is controlled by flap valve and sealing door, effectively isolates high-temperature area before dust removal, guarantees operator and equipment safety, improves operating stability and environmental protection.

This application discloses a corner module steering mechanism based on a rolling screw pair, comprising: a drive motor fixedly mounted on the vehicle body; a steering knuckle connected to the wheel hub, the steering knuckle having a steering arm and a lower connection point formed thereon, a steering tie rod connected to the steering arm, and the lower connection point being the lower point of the kingpin; and a rolling screw pair connected to the vehicle body, comprising a screw, a nut, and rolling elements, the nut being fitted onto the screw, the rolling elements being disposed between the nut and the screw, the nut being connected to the output end of the drive motor, and one end of the screw being connected to the steering tie rod, the screw being configured to move linearly only along the axial direction of the nut; when the wheel steers, the drive motor drives the nut to rotate and transmits the rotation through the rolling elements, causing the screw to move axially, which in turn drives the steering knuckle to rotate around the kingpin via the steering tie rod. This application eliminates the complex piping and pump structure of the hydraulic system, resulting in a simple and compact structure, and eliminating the possibility of hydraulic oil leakage.

The utility model discloses a water heating pipeline exhausting and dirt removing device which comprises an exhausting and dirt removing mechanism and a dirt remover, the top of the dirt remover is fixedly connected with a top cover, a filter screen is arranged in an inner cavity of the dirt remover, a cleaning assembly is arranged in the filter screen, a fixing assembly is arranged in the inner cavity of the dirt remover, and an exhausting assembly is arranged in the top cover. According to the device, the water inlet pipe is connected with the water inlet valve on the water heating pipeline, the water outlet pipe is connected with the water outlet valve on the water heating pipeline, the connecting pipe of the filter screen can be in contact and fit with the inner side of the water inlet pipe through the placing plate and the guide plate, and when liquid in the water heating pipeline enters the dirt separator through the water inlet pipe, the liquid is filtered through the filter screen; the filtered liquid is discharged through the water outlet pipe; the motor works, the rotating roller drives the cleaning side rod and the cleaning bottom rod to rotate, the bottom and the side wall of the filter screen can be cleaned, and the situation that dirt is attached to the filter screen, so that the permeability of the filter screen is poor, and the flow of liquid is affected is avoided.

This invention discloses an underwater acoustic anti-interference transmission method and system based on sparse time-frequency feature mapping. The method includes: at the transmitting end, adaptively generating a fractional-order linear frequency-modulated waveform with a specific time-frequency shear slope based on the Doppler state of the underwater acoustic channel, achieving physical-layer focusing of transmitted energy; at the receiving end, constructing a hybrid observation model containing wide-block sparse channel components and narrow-block sparse burst noise components, and using a dual-channel variational Bayesian algorithm to jointly iteratively infer the posterior probability distribution of environmental burst noise in the fractional-order domain; finally, recovering the original signal through soft-threshold interference cancellation and fractional-order channel equalization. This invention effectively solves the communication failure problem caused by high-dynamic Doppler diffusion and marine biological impulse noise interference in underwater acoustics by actively mapping the waveform and using heterogeneous sparse joint inference at the receiving end, significantly improving transmission reliability in harsh underwater acoustic environments.

This utility model discloses an automatic unloading and docking device for tool processing, including a housing and a filter screen. A tool assembly is disposed inside the housing, and an L-shaped connecting plate is disposed inside the housing. A turntable assembly is disposed at the top of the L-shaped connecting plate, and a fixing plate is fixedly installed at the bottom of the L-shaped connecting plate. A cleaning assembly is disposed at the top of the fixing plate. This utility model releases air by opening the sealing cover, causing the inflatable sealing ring to contract and releasing the locking of the sealing ring block. This allows the sealing ring block to rotate, driving the filter screen to rotate and quickly clearing clogged impurities without disassembling the filter box, significantly shortening cleaning time. After cleaning, the sealing ring block resets and is inflated by a dual-head air pump, causing the sealing ring to tightly adhere to the inner wall of the filter box, re-forming a reliable seal to prevent liquid leakage. By combining sealing and cleaning functions, this device simplifies maintenance procedures, reduces downtime, lowers the complexity of manual operation, and improves equipment usability and maintenance efficiency.

The application provides a high-sealing injection mold, and relates to the field of injection molds.The injection mold comprises an upper mold and a lower mold, the top of the upper mold is connected with a hydraulic cylinder, the lower mold is internally provided with an ejection mechanism, the edges of the cavities of the upper mold and the lower mold are respectively provided with mutually matching tapered surfaces, and a sealing strip and a sealing groove that are sealingly matched are respectively arranged on the two tapered surfaces; the tapered surface of the lower mold expands toward the outside of the cavity; the top of the upper mold is provided with an exhaust hole, and the exhaust hole is provided with an exhaust sealing structure; the bottom of the cavity of the lower mold is provided with multiple ejection holes at intervals, and the ejection holes are provided with tapered sealing sections near one end of the cavity; the ejection mechanism comprises an elastic driving assembly and multiple ejector rods connected with the elastic driving assembly, the multiple ejector rods are respectively and one-to-one correspondingly arranged in the multiple ejection holes, and one end of the ejector rod is provided with a tapered matching part matched with the tapered sealing section.The application is sealed at multiple leakage points of the mold, and has high sealing performance.

This utility model discloses a planar magnetron sputtering device belonging to the technical field of vacuum coating equipment. The device includes a motor, a main body, a target material, a cooling backplate, and a base. The core of this application lies in the fact that the cooling backplate is composed of a cooling substrate and a cover plate. The cooling substrate has a specially shaped receiving groove, which includes a first groove segment and a second groove segment connected to each other along its depth direction. The cover plate is embedded in the first groove segment to seal the lower second groove segment, thereby forming a completely closed cooling channel. This utility model, through this permanent sealing structure of embedding the cover plate in the receiving groove, replaces the traditional removable mechanical seal that relies on sealing gaskets, fundamentally solving the technical problem of leakage easily occurring in large-size cooling backplates under high water pressure.

The invention discloses an enterprise-level knowledge base information query system and method based on HMAC, and relates to the technical field of information security, the system comprises a client, an authentication module, a large language interaction module and a knowledge base module; the client is used for acquiring an account, a password and a retrieval request of a user; the authentication module is connected with the client and is used for receiving the account and the password and generating a user token; the large language interaction module is connected with the client and used for receiving the retrieval request, generating a query plan and signing the query plan and the user token to obtain a first signature packet; the knowledge base module is connected with the client and is used for receiving the first signature packet and signing again after verification is passed to obtain a second signature packet; and the big language interaction module is also used for receiving the second signature packet, and generating a query result through a second big language model in the big language interaction module after the verification is passed. According to the invention, the security of information transmission between the client and the knowledge base can be improved.

This utility model relates to the field of ultrafiltration membrane equipment technology, and discloses an ultrafiltration membrane device for milk production, including a frame with crossbars fixedly connected to both the upper and lower ends of the frame. This ultrafiltration membrane device for milk production, through a shock-absorbing mechanism, involves first installing a shock-absorbing filter frame through the filter tube onto the inside of the crossbars when the device is to be used. A rubber shock-absorbing ring is installed in the middle of the shock-absorbing frame, which is initially fixed to the outside of the filter tube. Then, a shock-absorbing spring is installed outside the rubber shock-absorbing ring. To ensure shock absorption while protecting the filter tube, foam cotton is filled outside the shock-absorbing spring and inside the shock-absorbing frame for shock absorption protection. This effectively reduces vibration and shaking outside the filter tube, preventing the connection between the filter tube and other parts of the equipment from gradually loosening due to vibration, which could lead to milk leakage, waste of raw materials, contamination, interference with the normal operation of the ultrafiltration process, and reduced production efficiency.

This invention relates to the technical field of emulsion explosive packaging, and more particularly to a processing device for emulsion explosives. A feeding pipe is located in the middle of the machine body, connecting to an external feeding device. A mounting plate is fixedly connected to the top of the machine body, and a cylindrical block is located at the bottom of the mounting plate. The lower end of the feeding pipe passes through the cylindrical block. Symmetrical sliding blocks are provided on the mounting plate, and clamping arc blocks are slidably connected to the sliding blocks. A bidirectional threaded rod is rotatably connected to the mounting plate, and the bidirectional threaded rod is threadedly connected to the sliding blocks. A dual-axis motor is mounted on the mounting plate, and the dual-axis motor is connected to the bidirectional threaded rod. This solution effectively solves the problem of powder splashing and scattering during existing powder bagging processes, ensuring the health of operators and meeting industrial production safety and environmental protection requirements. The dual-axis motor and bidirectional threaded rod drive the clamping arc blocks to clamp the pre-made bag opening, and in conjunction with a piston rod and air cylinder, inflates the airbag block, sealing the gap between the bag opening and the cylindrical block.

This utility model discloses a low-resistance, sound-absorbing, enhanced composite fiberglass duct, comprising a duct body and a sound-absorbing inner tube. The duct body includes, from the inside out, a porous aluminum plate layer, a first fiberglass cloth layer, a glass fiber layer, a second fiberglass cloth layer, and an outer protective color steel layer. The surface of the porous aluminum plate layer has multiple equidistantly distributed strip-shaped grooves, and ventilation holes are provided on the inner walls of both sides of the strip-shaped grooves. The sound-absorbing inner tube includes two pairs of upper supports, two pairs of lower supports, a first sound-absorbing aluminum tube, a fiberglass ring, and a second sound-absorbing aluminum tube. By setting the strip-shaped grooves and ventilation holes, the contact area between the airflow and the porous aluminum plate layer can be increased, allowing the glass fiber layer to better absorb sound waves. By setting the sound-absorbing inner tube, sound waves will contact the second and first sound-absorbing aluminum tubes from both the inside and outside sides respectively. Finally, the fiberglass ring can further reduce noise. This utility model effectively improves the sound absorption and noise reduction effect when the wind speed is high or the noise level is high.