23results about How to "Increase path length" patented technology

The invention belongs to the technical field of path planning and robot motion planning, and particularly relates to a multi-strategy fusion improved RRT * sampling planning method and device and a storage medium, and the method comprises the steps: constructing a dual-search tree through a starting point and a target point in a three-dimensional working space, and selecting a to-be-expanded search tree through a random mode; halton-Bridge mixed sampling is adopted to generate sampling points, so that the global coverage uniformity is improved, and the narrow channel sampling capability is enhanced; calculating the dynamic step length of the exponential decay based on the local obstacle proportion; adopting a hierarchical guidance expansion strategy, preferentially expanding towards a target, introducing an improved artificial potential field to guide expansion when the expansion fails, and taking the bottom with random expansion; performing RRT * neighborhood father node reselection and reconnection optimization on the new node; greedy pruning, self-adaptive interpolation and cubic B-spline smoothing are carried out on a path after the double trees are connected, and an executable smoothing track is output; according to the scheme, planning efficiency, success rate and path quality are improved.

This invention discloses a high-transparency, high-haze polypropylene material and its preparation method. The material is prepared by mass ratios of 93.2-98 parts polypropylene, 1-4 parts light diffusing agent, 0.2-0.6 parts α-nucleating agent, 0.2-0.6 parts β-nucleating agent, 0.2-0.4 parts antioxidant, 0.2-0.6 parts dispersant, and 0.2-0.6 parts light stabilizer. The nucleating agent is a compound of α-nucleating agent and β-nucleating agent in a mass ratio of 2-5:2-6. By adding specific proportions of α-nucleating agent and β-nucleating agent, this invention induces the polypropylene molecular chains to arrange themselves in a specific manner, thereby forming different spherical (α-crystal form) and rod-shaped (β-crystal form) crystal structures. This causes optical fibers that pass through the material surface and into the matrix to undergo multiple refractions before penetrating the matrix, thus increasing the path length of light within the material and enabling the material to maintain high transparency while exhibiting higher haze.

The utility model relates to the technical field of centrifugal fans, and discloses a multistage noise reduction flow guide structure of a centrifugal fan, which comprises a centrifugal fan main body, the inner wall of the centrifugal fan main body is fixedly connected with sound absorption cotton, one end of the centrifugal fan main body is fixedly connected with a flow guide cylinder, and the inner wall of the flow guide cylinder is fixedly connected with a noise reduction component. A dustproof assembly is arranged at one end of the guide cylinder, the noise reduction assembly comprises a double-layer micro-perforated plate arranged on the inner wall of the guide cylinder, a honeycomb metal guide plate is fixedly connected into the double-layer micro-perforated plate, and the dustproof assembly comprises a mounting plate arranged at one end of the guide cylinder. According to the multi-stage noise reduction flow guide structure of the centrifugal fan, by arranging the sound absorption cotton, the reinforcing layer and the noise reduction assembly, the purpose of multi-stage noise reduction is achieved, the situation that when airflow enters the air inlet, vortexes can be formed, generated airflow turbulence collides with the fan in a large amount, and large noise is generated is avoided, and sound pollution generated by the centrifugal fan can be improved.

The utility model discloses an axial flow water turbine water guide mechanism which comprises an upper ring seat (1) and a lower ring seat (2), a plurality of guide vanes (3) are arranged between the upper ring seat (1) and the lower ring seat (2), rotating shafts (4) are arranged in the middles of the upper ends and the lower ends of the guide vanes (3), driving rings (5) are connected to the upper ring seat (1) in a rotating mode, servomotors (6) are connected to the driving rings (5), and the servomotors (6) are connected to the driving rings (5). The upper ends of the rotating shafts (4) are connected with the driving ring (5) through a first connecting rod (7) and a second connecting rod (8), and a linkage mechanism connected with the lower ends of all the rotating shafts (4) is arranged at the bottom of the lower ring seat (2); the linkage mechanism comprises a plurality of adapter plates (9), the adapter plates (9) are fixed to the lower ends of the rotating shafts (4) respectively, third connecting rods (10) are arranged between the adjacent adapter plates (9), and the third connecting rods (10) are hinged to the adapter plates (9). The utility model has the advantage of low maintenance frequency.

The utility model relates to the technical field of kitchen appliances, and discloses a range hood which comprises an exhaust fume collecting hood and an oil cup arranged at the bottom of the exhaust fume collecting hood, in the length direction of the exhaust fume collecting hood, the bottom of the exhaust fume collecting hood is connected with the oil cup through a detachable structure; a notch communicated with the oil cup is formed in the rear side of the bottom of the exhaust fume collecting hood, the notch and the detachable structure are arranged in a spaced mode, and a blocking part is further arranged at the bottom of the exhaust fume collecting hood and located between the notch and the detachable structure. The blocking part is arranged at the bottom of the exhaust fume collecting hood, so that oil stains at the notch can be prevented from directly flowing to the area where the detachable structure is located along the bottom of the exhaust fume collecting hood in the oil discharge process, the detachable structure can be prevented from being polluted by the oil stains, and the clean state of the area where the detachable structure is located is maintained.

This application provides a sound amplification device based on M-H metamaterials and a sound propagation method utilizing them. The sound amplification device includes at least an upper shell, a lower shell, and a waveguide located between the upper and lower shells. The waveguide is made of Mie metamaterials. The waveguide includes an outer wall with multiple sound wave inlets. The upper shell, lower shell, and outer wall enclose and form a waveguide space. A through-hole is provided within the waveguide space, penetrating the waveguide and the upper shell, serving as the sound wave outlet in the sound amplification device. The waveguide includes multiple fan-shaped sections arranged circumferentially around the through-hole. A waveguide channel is formed between adjacent fan-shaped sections, connecting the sound wave outlet and the sound wave inlets. The control current of the sound source is determined by the size of the sound amplification device and the scattering distribution of the sound amplification device under different resonance modes. The sound energy level at the sound wave outlet is higher than that at the sound source, and the propagation direction has an angle. By determining the control current at the sound source that best matches the size of the sound amplification device, low-cost, high-precision, and widely applicable sound propagation control is achieved.

The utility model relates to the technical field of cable detection, in particular to a guiding and conveying mechanism which comprises a guiding pulley block. The guide pulley block comprises two first guide wheels which are provided with brackets and are symmetrically distributed, and a second guide wheel which is positioned in the middle of the two first guide wheels; a first supporting piece is fixed to the top of the first guide wheel, a second supporting piece is fixed to the bottom of the second guide wheel, and the first supporting piece and the second supporting piece can be clamped with each other. And the first guide wheel and the second guide wheel are sequentially arranged to form a cable passing path. The utility model has the beneficial effects that the guide pulley blocks which are staggered up and down form a composite stress field, and the traditional scheme of synchronously applying three mechanical stresses of bending, stretching and extruding is mostly single-direction stress, so that hidden damage is physically expanded when passing through the pulley.

The utility model discloses a kind of full-sealed type tensioning wheels, it is related to engine transmission technical field.The tensioning wheel includes swing arm, bearing and pulley, swing arm is connected by bolt with bearing, pulley is sleeved in bearing outer. To solve the problem that bearing is easy to enter water and dust under harsh working condition, pulley one end surface is equipped with sealing cover, sealing structure is equipped between the other end surface and swing arm, and the outer wall of bearing outer ring is equipped with plugging ring. Sealing structure includes annular groove on swing arm and the rubber sealing ring arranged in, sealing ring is equipped with convex part with triangular section, is blocked in pulley inner hole wall and groove. Pulley is also equipped with let slot, and annular groove edge forms "n" shape barrier gap. The utility model passes through multiple sealing structure, effectively blocks the water, dust invasion path, significantly improves the sealing property and service life of tensioning wheel, and is applicable to engineering machinery and wade engine.

The application provides an acoustic resonator, comprising a substrate, a resonant functional layer arranged above the substrate, the resonant functional layer comprising at least a bottom electrode, a piezoelectric layer and a top electrode arranged in a stack, a resonant cavity arranged between the resonant functional layer and the substrate, an effective resonant area being defined by the area where the resonant functional layer overlaps the resonant cavity, a release hole at least penetrating the piezoelectric layer and communicating with the resonant cavity, a channel penetrating the resonant functional layer and communicating with the resonant cavity, the channel communicating with the release hole through the resonant cavity, and in a horizontal direction, the maximum cross-sectional area of the channel is greater than the maximum cross-sectional area of the release hole. By arranging the channel penetrating the resonant functional layer and communicating with the resonant cavity, the heat center area of the resonator is removed, the heat accumulation of the effective resonant area is reduced, and the temperature uniformity is improved. Further, the side wall of the channel is provided with a reinforcing structure extending along the side edge of any layer in the resonant functional layer to the side edge of another layer, so that the structural strength of the resonator is improved and the transverse wave is inhibited.

The utility model relates to a highway roadbed side slope antiskid device, including the protective net frame of installation in the side slope body slope surface, the protective net frame is fixed on the side slope body through the anchor rod and the anchor line, the protective net frame is arranged and is set up with many sets of buffer components on the upside and downside of the side slope body side, the buffer component includes the multiple material guide plate of the upper portion and lower portion transverse arrangement setting, the material guide plate is set up in inverted " V " character type, and there is gap between the adjacent material guide plate of upper portion and between the adjacent material guide plate of lower portion, to facilitate material to guide down, through the utility model can when the debris flow is from the side slope body by the upper to the downward flow, the gradient shape design of material guide plate and the mutual cooperation between multiple material guide plates, can play the good buffer effect to the debris flow. The material guide plate of staggered arrangement has increased the path length and the resistance of mudstone roll, has effectively slowed down the roll speed of mudstone, has reduced its impact force.

The utility model relates to building template technical field, proposes a kind of building template for concrete building, gradient vibration-suppression hole structure is constructed inside the core layer of damping layer, wherein relatively dense structure, to enhance the reflection and scattering effect of high-frequency vibration, wherein loose structure is conducive to absorption and dissipation low-frequency vibration energy, by controlling the gradient change of pore, realize the efficient suppression of different frequency vibration, set up spiral special-shaped hole in the damping layer, compared with traditional circular hole, can increase the path length and reflection times of vibration wave inside the propagation of damping material, when vibration wave propagates along spiral hole, will constantly occur reflection and refraction, thereby more vibration energy is converted into heat energy and other forms of energy and dissipates, simultaneously the existence of special-shaped hole can also enhance the interaction of damping material and air, further improve damping effect.

The application relates to a connecting assembly of a vehicle controller, a controller and a vehicle. The connecting assembly comprises an insulating base and a conductive piece. The insulating base has a receiving cavity. The insulating base comprises a first opening and a second opening, which are respectively communicated with the receiving cavity. The axial direction of the first opening intersects with the axial direction of the second opening. The conductive piece is connected to the insulating base. A part of the conductive piece is located in the receiving cavity. The conductive piece comprises a main body part and a bent part. The main body part passes through the first opening. The bent part is connected with the main body part and is bent relative to the main body part. The bent part passes through the second opening and extends out of the receiving cavity. The axial directions of the first opening and the second opening intersect with each other in the application. When the conductive piece passes through the insulating base, a certain bending path is formed. The bending increases the path length and difficulty of oil and gas penetration.

The utility model relates to a fan device and vertical face cleaning equipment. The fan device comprises a shell, a driving mechanism, an impeller assembly and a turbulent flow part. A containing cavity and a spiral air duct arranged around the periphery of the containing cavity are formed in the shell, and the spiral air duct is constructed to be communicated with the air inlet side and the air outlet side of the fan device; the driving mechanism is arranged in the accommodating cavity; the impeller assembly is in transmission connection with the driving mechanism, and the impeller assembly is driven by the driving mechanism to rotate, so that external airflow flows from the air inlet side to the air outlet side through the spiral air duct; the turbulent flow part is arranged in the spiral air channel and disturbs airflow flowing through the spiral air channel. By arranging the spiral air duct, the airflow exhaust path is greatly prolonged, and the turbulent flow part is arranged in the spiral air duct, so that airflow in the spiral air duct can be disturbed, sound wave energy is partially consumed before reaching the outlet, and the noise reduction effect can be achieved.

The utility model provides a laser radar. The laser radar comprises a housing, and a transmit-receive module, a lens, a transmitting reflector, a hole reflector and a receiving reflector which are arranged in the housing. Wherein the receiving and transmitting module comprises an emitter and a receiver, the emitter is used for emitting an emitting light beam, and the receiver is used for detecting a receiving light beam; the emission reflector is used for reflecting the emission light beam to the lens; the lens is used for collimating the emitted light beam to obtain a collimated light beam and focusing the received light beam to the hole reflector; the hole reflecting mirror is used for reflecting the received receiving light beam to the receiving reflecting mirror; and the receiving reflecting mirror is used for reflecting the receiving light beam reflected by the hole reflecting mirror to the receiver. The utility model further provides equipment. According to the invention, the path length of the receiving path is increased by arranging the receiving reflector.

The utility model discloses an energy -saving polyester fiber microwave drying setting equipment relates to polyester fiber drying equipment technical field, and this utility model discloses a processing box, and the both ends of processing box are passed through and are opened the through -slot, and the inside fixed of processing box is equipped with the partition board of vertical setting, also open the through -slot of same level with processing box on the partition board, and the inside one end fixed of processing box installs and is equipped with the microwave generator of upper portion, through with the first winding roller and second winding roller to the fiber cloth in the microwave drying area along " triangle road course " around, effectively increased the path length of cloth in the microwave field, prolonged its residence time in the microwave drying area, let cloth have more sufficient time absorption microwave energy, make internal moisture fully vaporization, evaporation and discharge to the effect of microwave drying of fiber cloth in the microwave drying area of cloth of the utility model, make up the insufficiency that the lack of drying time leads to the direct conveying of cloth in the past.

The invention discloses an adjustable time sequence driven obstacle avoidance wiring tree generation method and system, and relates to the technical field of integrated circuits, and the method comprises the steps: taking an obstacle avoidance right-angle Steiner minimum spanning tree as an initial tree, and evaluating whether the initial tree has the optimization potential or not; if it is judged that the initial tree has the optimization potential, optimization potential evaluation values of all pins in the initial tree are calculated; target pins are selected according to the optimization potential evaluation value, and points corresponding to all the target pins and the point with the longest path length in the initial tree are added into a point set; performing global optimization and local optimization on the path length of each point in the point set to obtain a combination graph; and performing iterative tree reconstruction based on the combination graph to obtain a tree with the minimum bus length as a final reconstruction tree. According to the method, the key path length can be remarkably shortened on the basis of the original obstacle diagram spanning tree, meanwhile, the bus length is slightly increased, the increasing range of the bus length is adjustable, and balance between obstacle avoidance and the key path is considered.

The application relates to the technical field of solar cells, and particularly discloses a solar cell and a preparation method thereof. The solar cell comprises a silicon substrate, the silicon substrate comprises a front surface and a back surface, the front surface comprises a first laser contact area, a second laser contact area and a third laser contact area, the first laser contact area and the third laser contact area are alternately and spacedly arranged on the front surface of the silicon substrate; the second laser contact area and the first laser contact area are overlapped in a vertical direction, the width of the second laser contact area is smaller than that of the first laser contact area, the front surface further comprises a front surface metal electrode, the front surface metal electrode is in contact with the second laser contact area, and the crystallization rate of the second laser contact area is higher than that of a non-overlapping area in the first laser contact area. The solar cell has the advantages that the contact resistance of the metal grid line is reduced through gradient crystallization treatment, filling gain is brought, and the photoelectric conversion efficiency of the solar cell is further improved.

The utility model relates to a suspended ceiling acoustical board which comprises an acoustical board body, a first square groove is formed in the surface of the acoustical board body, a second square groove is formed in one end of the interior of the first square groove, a third square groove is formed in one end of the interior of the second square groove, and acoustical components are installed at the tops of the first square groove, the second square groove and the third square groove. According to the utility model, sound waves in the multi-stage groove structure encounter the steps to change directions, partially enter the deeper grooves and partially reflect back to the preceding-stage grooves to form multiple reflections, so that the length and the times of the reflection propagation path of the sound waves in the groove structure are increased, and the sound waves are repeatedly reflected, refracted and diffracted on the inner walls (especially the complex surfaces of the steps) of the grooves and are more frequently and violently rubbed with the wall surfaces; more sound energy is converted into heat energy to be consumed, and the sound absorption effect can be improved without stacking sound absorption materials.

A hydrogen gas generating device with heat dissipator includes a water tank, an electrolytic module and a heat dissipator. The water tank has an accommodating space configured for accommodating water. The electrolytic module is configured in the accommodating space of the electrolytic module and to receive and electrolyze water to generate gas comprising hydrogen. The heat dissipator is coupled to the water tank and includes an inlet tube, an outlet tube and at least one tubular structure. The inlet tube is connected to the water tank and configured to receive the water from the water tank. The outlet tube is connected to the water tank and configured to output the electrolytic water to the water tank. The tubular structure connects to the inlet tube and the outlet tube to provide the electrolytic water to pass through.

The present application discloses a converter slag blocking device, in which a raised platform and a butt joint platform are arranged in the brick arrangement, and the bowl brick is cancelled, the service life of the brick arrangement and the taphole is improved, the original brick arrangement and the easy brick arrangement are arranged, the precision of the brick arrangement installation is improved, the brick arrangement pressing plate is a flat plate type and is provided with a stepped lifting hole and a lifting hook in the lifting hole, the bending deformation of the brick arrangement pressing plate is reduced, the quick lifting problem of the brick arrangement pressing plate is solved, the precision of the brick arrangement installation is further improved, the brick arrangement overhang of the buffer base, the pressing plate relaxation chamber and the bolt stretching pool are arranged, the flexible fire clay contact between the buffer base and the brick arrangement is ensured at all times, the problems of the bending deformation of the inner slide plate cavity plate, the plate surface crack fracture of the inner slide plate, the slide plate clamping steel and the like caused by the over-high installation of the brick arrangement and the brick arrangement pressing plate are solved, and the stability of the mechanism surface pressure is obviously improved, the converter slag blocking device is safe and long in service life, stable in operation, low in comprehensive cost and simple in operation and maintenance.

The utility model discloses a foot socket, and relates to the technical field of sockets. The foot margin socket comprises a bottom box, a surface cover and a sealing assembly. A first opening is formed in the top of the bottom box; the surface cover covers the top of the bottom box and can be opened relative to the bottom box so as to expose the first opening; at least one part of the sealing assembly is located between the bottom box and the face cover and makes contact with at least one part of the top face of the bottom box, the orthographic projection of the top face of the bottom box on a set plane is provided with a first outer contour, and the orthographic projection of the top face of the bottom box on the set plane is provided with a second outer contour. The first outer contour coincides with a second outer contour of the orthographic projection of the sealing assembly on the set plane or is located in the orthographic projection of the sealing assembly on the set plane, and the set plane is perpendicular to the opening direction of the first opening. The foot margin socket disclosed by the utility model has good decoration performance, and can also reduce the risk of water and dust entering at the same time.

This invention discloses a method for promoting the extrusion and dehydration of fine coal gasification slag using mechanical pore breaking and vibration force field empowerment, comprising the following steps: grinding the fine coal gasification slag using a wet ball mill for 1-9 minutes to obtain a slurry; and determining the median particle size d of the carbon-containing fine coal gasification slag after grinding. 50 The particle size is 5.9–19.3 μm. The slurry is pretreated by vacuum filtration to obtain a vacuum filter cake with a moisture content of 47–53%. A vibration extrusion dewatering device is then used to dewater the gasified fine slag after grinding, yielding a filter cake with a moisture content of 29–36%. This method improves dewatering efficiency, reduces dewatering energy consumption, and achieves good dewatering results.