690results about How to "Reduce collision" patented technology

An RFID tag interference solving method based on a density peak value clustering algorithm reduces signal interference between tags and improves reliability and identification precision of a system by dynamically adjusting priorities and time windows of RFID tags. The method comprises the following core steps: firstly, acquiring a label response signal through an RFID reader-writer; secondly, preprocessing the data, and removing noise and abnormal values; then, calculating the local density of the label signal, and identifying a density peak value region by using a clustering algorithm; then, reducing signal collision of tags in a high-density region by dynamically adjusting priorities and time windows of the tags in the region, and preferentially processing the tags; and finally, outputting a processed tag identification result. According to the invention, the problem of signal interference in a high-density RFID tag environment is obviously solved, the identification accuracy and the operation stability of the system are improved, and the method is suitable for various high-density tag application scenes.

The invention relates to the technical field of assembly line scheduling, in particular to an intelligent scheduling method and system for an automatic assembly line of a charging pile. The method comprises the following steps: acquiring a charging pile assembly production log; performing sliding window segmentation processing on the charging pile assembly production log, and performing staged assembly demand feature analysis to obtain assembly demand feature data of different stages; the real-time production progress of each assembly line is extracted based on the charging pile assembly production log; demand supply deviation prediction is carried out on the real-time production progress of each assembly line according to the assembly demand characteristic data of different stages, and assembly lines lack of productivity are marked; an all-dimensional real-time monitoring image of the assembly line is collected; and carrying out dynamic behavior analysis on the omnibearing real-time monitoring image of the assembly line, carrying out process operation logic analysis, and generating multi-stage process operation logic. According to the invention, high-efficiency and self-adaptive intelligent scheduling of the assembly line is realized.

The invention discloses a ship collision avoidance decision method based on two-stage safety reinforcement learning, and the method comprises the following steps: constructing a first-stage reinforcement learning ship collision avoidance decision model which is used for enabling a ship to take collision avoidance actions when the ship has other ships or obstacles within a first threshold value around the ship; a second-stage safety reinforcement learning ship collision avoidance decision model is constructed and used for limiting the ship action space to ensure the ship navigation safety when the ship has other ships or obstacles within a surrounding second threshold value; under a first threshold condition, adopting the trained first-stage reinforcement learning ship collision avoidance decision model to carry out collision avoidance decision in the ship running process; and when the ship and other ships or obstacles are in a second threshold condition, adopting the trained second-stage safety reinforcement learning ship collision avoidance decision model to carry out collision avoidance decision in the ship driving process. According to the method, the safety and economy of ship navigation are improved, and a safety guarantee is provided for a reinforcement learning collision avoidance algorithm.

The invention belongs to the technical field of bridge expansion joint welding, and particularly relates to a bridge expansion joint welding fixing device with a limiting mechanism, which comprises a welding seat, a processing seat fixed on the surface of the welding seat and bridge expansion joint profile steel attached to two sides of the surface of the processing seat, and a limiting assembly is mounted on the surface of the welding seat. The device is provided with the limiting assembly, the position of the bridge expansion joint profile steel can be effectively limited, it is guaranteed that the bridge expansion joint profile steel is kept in a stable state in the welding process, the welding quality can be better improved, and welding defects caused by position deviation of the bridge expansion joint profile steel are reduced; according to the bridge expansion joint profile steel limiting device, collision or damage caused by displacement of the bridge expansion joint profile steel is reduced, meanwhile, the bridge expansion joint profile steel is pressed and limited through the pressing plates at the four corners, limiting force can be applied to the bridge expansion joint profile steel in multiple directions, the overall limiting effect is enhanced, the profile steel can better resist external force interference in the welding process during welding, and the welding quality of the profile steel is improved. And smooth welding is ensured.

The invention provides an interconnection security and protection system based on the combination of a star flash technology and 5G-RedCap, and aims to solve the technical problems of complex wiring and high cost caused by wired connection of the existing interconnection security and protection system. The system comprises a concentrator and a cloud platform, and further comprises a plurality of detection devices, the concentrator and the plurality of detection devices are internally provided with star flash communication modules, adjacent detection devices communicate through the star flash communication modules, and the concentrator and the detection devices communicate through the star flash communication modules; the concentrator is further provided with a 5G-RedCap module, the concentrator is connected with the cloud platform through the 5G-RedCap module, and the cloud platform is connected with the mobile terminal. The detection equipment and the concentrator are respectively provided with a satellite flash communication module, so that mesh network networking in an area is realized, and a safety defense line in the area can be formed; the concentrator transmits equipment information in the area through the 5G-RedCap module and the cloud platform, networking between detection equipment can be achieved, mutual information linkage can be achieved, and the equipment information can also be uploaded to the cloud platform.

The invention relates to the technical field of automatic feeding devices, and discloses an automatic feeding device for automobile brake disc surface nitriding treatment, the automatic feeding device comprises a surrounding plate, the left side of the surrounding plate is fixedly connected with a motor, the inner wall of the surrounding plate is rotatably connected with a transmission shaft, and the circumferential surface of the transmission shaft is in transmission connection with a conveying belt; the outer surface of the surrounding plate is fixedly connected with a workbench, the top of the workbench is provided with an electric push plate, the right side of the workbench is provided with a nitriding treatment machine, and the top of the surrounding plate is provided with an indirect discharging mechanism. The brake disc feeding device has the advantages that deviation during brake disc feeding is prevented, the feeding accuracy is improved, the working efficiency of equipment is enhanced, during transportation, a motor drives a first sliding plate to conduct indirect feeding, the risk of brake disc blockage is prevented, the service life of the equipment is prolonged, and follow-up machining is facilitated.

The invention discloses an underwater routing protocol design method based on link sensing, and belongs to the technical field of underwater wireless sensor communication networking. The invention aims to solve the problem that the link quality of the existing underwater routing protocol cannot ensure reliable transmission of data. Comprising the following steps: dividing underwater wireless sensors into clusters based on set roles in a node control data packet; each cluster comprises a master node and a corresponding slave node; each master node receives a sensing data packet of the corresponding slave node; each master node maintains attribute information of the adjacent master nodes based on the master node attribute data packets of the adjacent master nodes, and establishes a reward function for transmitting the to-be-transmitted data packets of the master nodes between the two master nodes based on the attribute information of the master nodes; and after a next-hop master node of the underwater route is determined according to the reward function value, transmitting the to-be-transmitted data packet of the current master node to the next-hop master node until data transmission from the to-be-transmitted data packets of all the master nodes to the water surface ship receiving terminal is completed. The underwater sensing data transmission device is used for transmitting underwater sensing data.

The invention discloses an enhancement releasing platform which comprises a releasing pool arranged on the ground, the rear end of the releasing pool is a placing area, the front end of the releasing pool is a releasing area, a water outlet is formed in the front end of the releasing pool, a gate is arranged at the water outlet, the water outlet is communicated with a releasing groove, and the end, away from the releasing pool, of the releasing groove extends to the bottom of the releasing area. A water pumping assembly is arranged on the rear side of the releasing pool and communicated with a water inlet pipe, the end, away from the water pumping assembly, of the water inlet pipe extends to the releasing point, the water pumping assembly is communicated with a water outlet pipe, and the end, away from the water pumping assembly, of the water outlet pipe is communicated with the releasing pool. When the device is used, the biological individuals are firstly transferred into the releasing pool, the water level of the releasing pool is high, the height difference during transferring is small, the biological individuals are not prone to being injured, the biological individuals are released into a water body through the releasing groove after the gate is opened, in the releasing process, the releasing groove cannot be damaged due to water impact, friction and collision are reduced, and the survival rate is increased.

The invention discloses a navigation method and system of an autonomous mobile robot in a dense people stream environment. The method comprises the following steps: acquiring environmental data by using a sensor system on the robot; recognizing pedestrians, obstacles and ground states based on the collected data to obtain real-time sensing information; judging whether the environment is a dense people flow environment according to the real-time sensing information, if not, executing a normal navigation mode, and if yes, executing a people flow passing mode. The people flow passing mode comprises the following steps: dynamically planning a passing path according to a preset global path and real-time sensing information; judging whether the running direction of a pedestrian is consistent with the passing path direction or not, selecting a matched pedestrian as a following object, and keeping a safe distance; and if no matched pedestrian exists, the passing possibility is evaluated, and when the possibility is higher than a preset threshold value, the robot is controlled to perform real-time passing action. Through data fusion, dynamic path planning and an intelligent following strategy, the navigation efficiency, the success rate and the safety of the robot in a dense people stream environment are improved.

The invention relates to a wind tunnel PIV tracer particle rapid and uniform cooling and mixing device, and the device comprises a mixing channel section which is internally provided with a mixing channel, and the mixing channel is cylindrical; the first airflow inlets are formed in the end face of the inlet end of the mixing channel section and are annularly distributed along the end face of the inlet end of the mixing channel section; the center of the ring where the first airflow inlet is located coincides with the axis of the end face of the inlet end of the mixing channel; the second airflow inlet is formed in the end face of the inlet end of the mixing channel section and is formed in the axis of the end face of the inlet end of the mixing channel; the third airflow inlet is formed in the inlet end of the mixing channel section, and the third airflow inlet is formed in the tangential direction of the radial section of the mixing channel; the airflow outlet is formed in the outlet end of the mixing channel section; the first, second and third airflow inlets are in communication with the mixing channel. The device has the advantages of being simple in structure and low in cost, rapid mixing heat transfer of wind tunnel PIV tracer water particles can be achieved, and large-proportion collision in the mixing process is avoided.

The invention relates to the technical field of switch cabinets, and particularly discloses a high-voltage switch cabinet which comprises a cabinet body, a cabinet door is hinged to the front end of the cabinet body, a static contact is arranged in the cabinet body, and the high-voltage switch cabinet further comprises a handcart assembly, a pushing assembly and a protection mechanism which are arranged in the cabinet body. The pushing assembly comprises a screw rotationally arranged in the cabinet body and a moving block in threaded fit with the screw, the protection mechanism comprises a locking assembly and a buffer assembly, the locking assembly comprises a ratchet structure and a driving structure, and the driving structure is used for driving the ratchet structure to lock the screw in one direction when the moving block moves relative to the handcart. The buffering assembly comprises a rotating piece arranged at the end of the screw and a buffering structure. According to the invention, the pushing assembly can be locked when the movement of the handcart is subjected to resistance, so that the handcart is prevented from continuously moving and further being damaged, and meanwhile, the situation that the handcart suddenly stops moving and hurts an operator can be avoided.

The invention discloses an enterprise digital exhibition and sales architecture management system, and relates to the technical field of exhibition architecture management, and the system constructs and evaluates a regional distribution index Qyfb and a regional congestion index Ydz through a three-dimensional model building module, a layout management module and a real-time human traffic analysis module, can accurately evaluate the spatial distribution between showcases, and improves the exhibition and sales efficiency. The layout is adjusted in time to optimize the use efficiency of the exhibition area, and the exhibit is prevented from being too dense or loose; the method monitors and predicts the crowd congestion condition of the exhibition area in real time, dynamically adjusts the guide identifier and the interaction area setting, and relieves the congestion. The digital acquisition module and the analysis module realize comprehensive acquisition and analysis of illumination and environmental conditions of an exhibition site. The condition data set is deeply analyzed through the neural network technology, the illumination condition index Gztj and the ventilation condition index Tftj are calculated and evaluated to make corresponding management strategies, and the management efficiency of the exhibition site is improved.

The invention discloses an unmanned aerial vehicle formation obstacle avoidance and trajectory optimization method based on general calculation cooperation. The method comprises the following steps: step 1, formation control design among multiple unmanned aerial vehicles: utilizing a leader-follower formation model based on a virtual leader; modeling the unmanned aerial vehicle formation by an undirected graph G = (V, E); and 2, designing a path planning algorithm of the virtual leader: combining an artificial potential field method with an A * algorithm to carry out dynamic path planning. According to the method, the traditional A * algorithm is optimized, and an adaptive path search mechanism is introduced, so that the path search efficiency is remarkably improved. The unmanned aerial vehicles in the formation serve as independent units, and the stability of the formation is maintained while path planning is carried out. The invention provides a new method for unmanned aerial vehicle formation obstacle avoidance and path planning in an obstacle environment.

The invention discloses raw material screening equipment for canned fruit processing, and relates to the technical field of raw material screening. According to the raw material screening equipment for canned fruit processing, through the design of the composite mechanism, fruits enter the composite shell from the input mechanism, on one hand, the descending flow of the materials is controlled, on the other hand, the descending speed of the fruits is slowed down, collision between the fruits and the equipment is reduced, and it is avoided that the surfaces of the fruits are damaged, the eating taste is affected and bacterial infection is avoided; a first motor is started to drive a central rotating shaft to rotate, so that a cleaning mechanism rubs the fruits, the effect of cleaning impurities on the surfaces of the fruits is achieved, soil, branches and leaves on the surfaces of the fruits are removed, and the cleanliness of the fruits is improved; and the stirring mechanism drives the fruits to rotate, friction between the fruits and the cleaning mechanism is promoted, the fruit cleaning speed is increased, and the operation efficiency is improved.

The invention belongs to the field of geological research, and discloses a disintegration instrument capable of eliminating water turbidity in the loess disintegration process and a use method thereof, the disintegration instrument comprises a support, a transparent water tank, a camera and a data acquisition device; a water pump is arranged in the transparent water tank; a plurality of stacked filtering water tanks are arranged on the transparent water tank, a seepage hole-containing water pipe is arranged in the filtering water tank on the top layer, and one end of the seepage hole-containing water pipe is connected with a water outlet pipe arranged on a water outlet of the water pump; fully-paved filter cotton is arranged at the bottom of each filter water tank, every two adjacent layers of filter water tanks are connected through a bottom filter type drain pipe, a connected filter water return pipe is arranged on a water blowing port of the bottom filter type drain pipe of the filter water tank at the bottom layer, and the other end of the filter water return pipe is located in the transparent water tank; a tension sensor is arranged on the bracket, a connecting ring is arranged on the tension sensor, a filter screen for bearing a loess sample is arranged on the connecting ring, and the filter screen is positioned in the transparent water tank. And suspended sediment generated by the test can be effectively removed, and the accuracy of data is ensured.

The utility model provides a protection device, and relates to the technical field of big tree transplanting. The protection device comprises a base used for installing the device, an adjusting mechanism is arranged on the upper surface of the base, a protection mechanism is arranged above the base and comprises a first spring, a sliding plate and a belt, the sliding plate is slidably connected to the surface of the inner wall of the base, and the first spring is fixedly installed at the bottom end of the inner wall of the sliding plate. The protection device solves the problems that when an existing protection device is used, a tree needs to be lifted to the position over the device and then falls down to be placed on the device to be clamped and fixed, the process is tedious, time and labor are wasted, and vibration can be generated in the transportation process; the problems that the tree trunk is damaged due to the fact that the tree trunk collides with the clamping blocks easily, and the survival rate of the tree is affected are solved, and the beneficial effects that vibration and collision borne by the tree in the transportation process can be effectively reduced, the survival rate of transplanted trees is improved, the tree can be clamped conveniently, and manpower can be saved are achieved.

The utility model provides a vertical axial flow pump, relates to axial flow pump technical field, including water inlet straight pipe, water outlet elbow and first motor, the lower part of water inlet straight pipe is provided with water inlet horn, and in the water inlet horn is sleeved with filter screen cylinder, the upper end of water inlet straight pipe is equipped with water outlet elbow, the lower end of water outlet elbow is equipped with first motor. An upper sealing sleeve seat is arranged on the upper portion of the water outlet bent pipe, a water guide pipe is arranged at the upper left corner of the upper sealing sleeve seat, a first motor is installed on the upper side of the upper sealing sleeve seat, a water inlet cavity is formed in the water inlet straight pipe, a water outlet cavity is formed in the water outlet bent pipe, and the water inlet cavity and the water outlet cavity are communicated. A lower gasket is arranged at the lower end of the water inlet horn, and a lower connector is arranged on the inner side face of the lower gasket. Water flow is conveniently and stably filtered, the upper portion and the lower portion of the pump shaft are stably connected, rotation of the pump shaft is smooth and stable, the impeller is driven to rotate, introduced water flow is large, adherends on the inner wall of a pipeline are conveniently removed, and the pump is more convenient and practical.

The invention discloses a blade protection device for a wind driven generator, and particularly relates to the technical field of wind driven generators, the blade protection device comprises a blade, a protection sleeve is mounted on the outer side of the blade, two limiting boxes are fixedly connected to the outer side of the protection sleeve, fixing assemblies are mounted in the limiting boxes, and a protection mechanism is mounted on the outer side of the protection sleeve; the outer side of the protective sleeve is fixedly connected with two nylon belts, one end of each nylon belt is fixedly connected with a rack belt, the inner side of the protective sleeve is fixedly connected with a plurality of first rubber strips and second rubber strips, and the first rubber strips are installed on one sides of the second rubber strips; the fixing assembly comprises a pull rod. By arranging the fixing assembly and the protection mechanism, the protection sleeve can be prevented from loosening or falling off under the wind action or other external force interference, so that it is ensured that the blade tip can be continuously and stably protected, meanwhile, collision and friction between the blade tip and the surrounding environment in the transportation process can be effectively reduced, and the service life of the blade tip is prolonged. Therefore, the risk that the blade tip is damaged is reduced.

The utility model discloses a guide rail structure for window glass, which relates to the technical field of automobiles and comprises an external c-shaped fixed sliding seat, a sliding unit and a sealing sliding unit. The upper end of the inner side of the external c-shaped fixed sliding seat is fixedly connected with a rectangular mounting plate, and the external c-shaped fixed sliding seat is a curved sliding seat with a certain radian; the sliding unit comprises a first sliding groove, an inner side rolling limiting groove, a sliding mounting seat and a spherical rolling bead, the first sliding groove is fixedly connected to the rear end of the upper side of the rectangular mounting plate, and the inner side rolling limiting groove is fixedly connected to the lower end of the inner side of the first sliding groove. The car window glass is connected with the guide rail through the sliding block, collision is reduced through the elastic buffering structure, and noise generated by sliding and noise transmitted into a compartment from the outside are reduced through the elastic buffering structure and the sealing noise reduction structure.

The invention provides a nanometer coating drying device, and relates to the technical field of coating drying, the nanometer coating drying device comprises a tower body and a vertical spiral conveyor, the lower part of the tower body is provided with a bottom plate, the vertical spiral conveyor comprises a material conveying pipe and a rotating shaft, a conical flow guide cover is arranged between the material conveying pipe and the bottom plate, and the upper part of the flow guide cover is connected with a separation cylinder; a blanking channel is reserved between the lower end of the separation cylinder and the flow guide cover; a spiral flow guide plate is arranged on the inner wall of the separation cylinder, and a disperser is mounted on the rotating shaft. The bottom feeding mode is adopted, so that intersection of to-be-dried nano paint entering the tower body and dried nano paint rising along with hot air can be reduced, collision and adhesion of the to-be-dried nano paint and the dried nano paint are reduced, hindering of the dried nano paint rising along with the hot air is reduced, the situation of excessive drying of the nano paint is reduced, and the drying efficiency of the nano paint is improved. And meanwhile, the to-be-dried nano-coating and the dried nano-coating can be isolated through the physical separation effect of the separation barrel, and the drying uniformity can be improved.

The invention provides an energy storage block stacking and positioning method and system, and relates to the technical field of energy storage block stacking and positioning.The method comprises the steps that platform carriages of a train are scanned to recognize the boundary of each platform carriage; according to the boundary of each flat carriage, boundary points of the preset stacking area are determined; according to the physical limitation of the hoisting clamp and the characteristics of a preset stacking area, the position and angle adjusting range of the clamp is determined, and the position and angle adjusting range comprises the coordinates of the clamp in the three-dimensional space and the rotating angle of the clamp; a population is initialized in which each individual in the population represents a set of candidate solutions for fixture positions and angles. By means of intelligent positioning and adjusting, accurate stacking of the energy storage blocks in the train flat plate carriage is achieved, the operation efficiency and accuracy are improved, meanwhile, safe resetting of hoisting equipment is ensured, and convenience is provided for continuous operation.

The utility model relates to the technical field of superposed beams, in particular to cleaning equipment for a pouring superposed beam combined die, and solves the technical problems that the cleaning mode of the die mainly depends on manual cleaning, so that workers are tired, and the efficiency is reduced; according to the technical scheme, the cleaning equipment for the pouring superposed beam combination mold comprises a bottom plate, supporting legs, a cleaning box, a drainage frame, a water outlet pipe, a feeding opening, a discharging opening, a moving assembly, a cleaning assembly and a drying assembly; through cooperative work of the moving assembly, the cleaning assembly and the drying assembly, the mold can automatically move in the cleaning box, it is ensured that all parts of the mold can be evenly sprayed, dirt and residues on the surface of the mold can be effectively and thoroughly removed in a spraying and scrubbing combined mode, and the mold cleaning efficiency is improved. In addition, hot air blown out by the fan heater rapidly takes away moisture on the surface of the mold, so that the mold is rapidly drained in a short time.

The air fryer comprises a machine shell and a reflecting cover, the reflecting cover divides the inner space of the machine shell into a heating cavity and a heat dissipation cavity, a hot air fan and a heating piece are arranged in the heating cavity, a motor for driving the hot air fan and a heat dissipation fan connected with the motor are arranged in the heat dissipation cavity, and an air inlet communicated with the heat dissipation cavity is formed in the machine shell. An air guide cover and a plurality of air guide ribs located on the periphery of the air guide cover are further arranged in the heat dissipation cavity, the air guide cover is provided with an air guide inlet and an air guide outlet communicated with the outside atmosphere, the heat dissipation fan is arranged in the air guide cover, a heat dissipation air channel is formed between every two adjacent air guide ribs in the multiple air guide ribs, and the heat dissipation air channels are communicated with the air inlet and the air guide inlet. Air flow extracted by the rotating cooling fan through the air inlet sequentially flows through the cooling air channels and the air guide cover and then is exhausted through the air guide outlet. According to the air fryer, the airflow short circuit phenomenon is effectively reduced, the problem of high temperature of a local area is solved, the heat dissipation effect is improved, and the machine surface temperature is reduced.

The invention discloses a measuring device and method for correcting torsion errors of an inclinometer guide groove, and the device comprises a data collection mechanism, an inclinometer and an inclinometer guide groove torsion angle measuring mechanism which extends into the inclinometer and is connected with the data collection mechanism. A first guide groove, a second guide groove, a third guide groove and a fourth guide groove are sequentially formed in the inner wall of the inclinometer pipe in the circumferential direction at equal intervals. The method comprises the following steps of: 1, burying the inclinometer; 2, mounting a measuring device; 3, measuring the torsion angle of the inclinometer; 4, measuring the displacement of the inclinometer pipe; and 5, carrying out torsion correction calculation on the inclinometer guide groove. The measuring device formed by combining the angle sensor and the sliding guide wheel is matched with the pre-buried inclinometer pipe, the torsion angles of the four guide grooves in each measuring section in the inclinometer pipe can be obtained, the relative torsion deformation angle of each measuring point of the inclinometer pipe is obtained through torsion superposition calculation, displacement errors, measured by the inclinometer, in different directions are corrected, and the accuracy of the displacement errors is improved. The calculation method is scientific and reasonable, and can reflect the real deformation condition.

The fresh cut flower storage device can prevent flowers from being squeezed in the transportation process. The fresh cut flower storage device capable of preventing the flowers from being squeezed in the transportation process comprises a base; the supporting frame is fixedly mounted at the top of the base; the multiple limiting plates are fixedly mounted on the sides, close to each other, of the two supporting frames correspondingly; the plurality of clamping plates are respectively mounted among the plurality of limiting plates in a sliding manner; and the placing frame is fixedly arranged among the plurality of clamping plates. The fresh cut flower storage device capable of preventing the flowers from being squeezed in the transportation process has the advantages that the structure is simple, fresh cut flowers can be stored in a separated mode so that squeezing damage caused by stacking of the fresh cut flowers can be prevented, and meanwhile the fresh cut flowers can be supported so that petals can be prevented from falling off due to pressing of the self weight.

The invention relates to the field of drilling equipment, in particular to a drilling machine slurry pump pressure reducing device which comprises a fixing assembly, a drilling assembly, a grinding assembly and a transmission assembly, the fixing assembly is fixedly arranged on the ground surface, the drilling assembly comprises a driving part, a drilling rod, a drilling bit and a sleeving pipe, the driving part is arranged on the fixing assembly, the drilling rod is arranged in the vertical direction, and the drilling rod is arranged in the sleeving pipe; the driving piece drives the drill rod to move in the vertical direction, the drill bit is fixedly connected to the bottom end of the drill rod, the sleeving pipe sleeves the drill rod, the drill rod is provided with a water outlet channel communicated with a water outlet of a slurry pump, the drill bit is provided with water spraying holes, and the water spraying holes are communicated with the water outlet channel; a slurry suction channel is formed in the sleeving pipe and communicates with a water inlet of the slurry pump, and the grinding assembly is arranged on the inner wall of the end, close to the drill bit, of the slurry suction channel. The drill rod drives the grinding assembly to grind rock debris through the transmission assembly. The situation that the pump pressure rises can be reduced, and normal work of the slurry pump is guaranteed.

The invention provides an electromagnetic accompanying signal identification method and system based on collision and accompanying analysis, and relates to the technical field of electromagnetic signal processing, and the method comprises the steps: obtaining different types of electromagnetic original signal data, and carrying out the preprocessing of the data to form a standard electromagnetic signal; extracting a central frequency point, a bandwidth and a modulation mode of a standard electromagnetic signal, and matching the central frequency point, the bandwidth and the modulation mode of the signal with a knowledge base signal according to a knowledge base matching method so as to separate an existing signal from an unknown signal; classifying the signals according to a grouping rule to form different sets, and extracting multi-scale feature data from the signals of the different sets; and performing signal collision analysis on the multi-scale feature data of different sets to obtain a collision set of the same signal, and performing adjoint analysis on the signals in the collision set to obtain adjoint signals of all the signals. According to the invention, an accompanying signal or a collision signal of the signal can be effectively found out, and an accompanying signal source can be quickly found out.

The embodiment of the invention provides narrow-distribution PLA (polylactic acid) microspheres as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving a PLA material in an organic solvent to obtain a dispersed phase; based on the total volume of the dispersion phase, the concentration of the PLA material in the dispersion phase is 60-300 mg / mL; dissolving polyvinyl alcohol in hot water to obtain a continuous phase; the mass concentration of the polyvinyl alcohol in the continuous phase is 1.5-5% by taking the total weight of the hot water as 100%; enabling the dispersed phase and the continuous phase to form a stable primary emulsion by adopting a porous membrane tube through a membrane emulsification method; stirring the primary emulsion under an ice bath condition at the temperature of 10 + / -2 DEG C to obtain a cured emulsion; and sequentially centrifuging, screening, collecting and freeze-drying the cured emulsion to obtain the narrow-distribution PLA microspheres. The PLA microspheres prepared by the preparation method provided by the invention are smooth and regular in surface, free of cracks, not easy to adhere, narrow in particle size distribution and high in yield.

The invention discloses a heritage tourist attraction guiding method and device based on virtual reality. The heritage tourist attraction guiding method comprises the steps of obtaining a geographic map of a target heritage tourist attraction; determining a path score of each path in the target heritage tourist attraction; according to the real-time scenic spot data and the evaluation data of each scenic spot in the target heritage tourist attraction, determining a scenic spot score of each scenic spot in the target heritage tourist attraction; determining a starting scenic spot according to the plurality of scenic spot scores and a preset preference of the first target; according to the starting scenic spot, the plurality of scenic spot scores, the plurality of path scores and the position relationship between the starting scenic spot and other scenic spots, constructing a target playing route of the target heritage tourist attraction; and feeding back the target playing route to the VR equipment of the first target, so that the first target advances according to the target playing route. The invention belongs to the field of virtual reality games. According to the invention, when the traveler wears the VR equipment to carry out tourism experience, the scenic spot can be truly restored, and the tourism experience of the traveler is improved.