106 results about "Horizontal projection" patented technology

The invention relates to the technical field of man-machine interaction, in particular to a multi-user-based ring pairing and left and right hand judgment method and system and a medium, and the method comprises the steps: firstly collecting azimuth angles, distances and historical tracks of a plurality of rings, and clustering the azimuth angles, the distances and the historical tracks into different user clusters; shoulder breadth geometric constraint, posture consistency, micro-motion synchronism and historical prior are fused in the cluster, paired scores are calculated, and paired rings are identified by using a greedy strategy; and then, calculating a judgment score to distinguish the left hand and the right hand by counting the rotation deviation of the angular velocity of the gyroscope on the horizontal plane projection and combining the spatial position score of the ring relative to the human body center line with the historical consistency. A steady-state mode and an event-driven wake-up mechanism are also introduced to balance power consumption. According to the invention, through multi-modal fusion, automatic ring pairing and accurate left and right hand judgment are realized.

The invention is suitable for the technical field of geological exploration, and provides a method for calculating the occurrence of a certain drill hole in a concealed ore body at an ore finding position, and the method comprises the following steps: obtaining the space coordinates of a target drill hole and a plurality of adjacent drill holes at the ore finding position; calculating a spatial distance and an azimuth angle; determining a weighting function adaptively changing along with the distance, and generating a group of space coordinates of virtual points corresponding to the adjacent drill holes; connecting the virtual points in sequence to form a polygonal curved surface, calculating the horizontal projection area of the curved surface, and calculating the vertical longitudinal projection areas of the curved surface in different directions; obtaining an inclination angle according to the ratio of the maximum vertical longitudinal projection area to the horizontal projection area; and determining the direction corresponding to the maximum vertical longitudinal projection area and the opposite direction, and determining the tendency by comparing the elevation values of the virtual points closest to the two directions. According to the method, the virtual points are connected into the polygonal curved surface, the form change of the ore body in the three-dimensional space is considered, and the method can better adapt to the concealed ore body in the complex form.

The application discloses a traffic radar pitch angle installation error calibration method and device and a storage medium. The method comprises the following steps: changing the frequency of a traffic radar according to a preset strategy in a preset frequency range; sequentially obtaining echo signal energy values of a preset target under different frequencies; if the obtained echo signal energy values meet preset conditions, determining the frequency corresponding to the maximum echo signal energy value as the working frequency of the traffic radar, so as to calibrate the traffic radar pitch angle installation error; wherein the preset target is arranged on the ground, and the distance between the preset target and the projection point of the traffic radar in the horizontal direction of the ground is the length of the horizontal projection of the central beam of the traffic radar when the traffic radar is installed at an expected pitch angle. The traffic radar pitch angle installation error calibration method and device and the storage medium not only calibrate the traffic radar pitch angle installation error at a low cost, but also solve the problem that the pitch angle installation error affects the detection range and the capture rate of the traffic radar.

This application discloses a cup pressing and positioning device, including a positioning block fixedly mounted on a mounting frame. The positioning block is fixedly equipped with a feeding device and an eccentric positioning mechanism. The positioning block has a through hole for the pressing execution component to pass through. In the embodiments of this application, the above-mentioned cup pressing and positioning device is used to realize the automatic feeding of the cup and the initial positioning with the pressing execution component through the feeding device. The eccentric positioning mechanism realizes the axial offset of the cup on the pressing execution component, so that the cup can pass through the guide cavity in an approximately elliptical inclined posture during the unilateral pressing process, thereby reducing the horizontal projected area of ​​the cup and avoiding radial shrinkage deformation. At the same time, under the inclined guiding action of the eccentric guide groove, the smoothness of the posture change during the pressing process of the cup is improved, ensuring the structural accuracy of the cup after pressing.

The invention relates to a loudspeaker arrangement (1) for stereophonic reproduction of acoustic signals, comprising a front loudspeaker unit (3) with a front radiation axis (4) that can be directed towards a target listening area, a left loudspeaker unit (6) with a left radiation axis (7) oriented in a horizontal projection plane transverse to the front radiation axis, and a right loudspeaker unit (9) with a right radiation axis (10) oriented in the horizontal projection plane transverse to the front radiation axis, wherein the front loudspeaker unit (3) and the left loudspeaker unit (6) are connected in series in a left audio channel (L) of the loudspeaker arrangement (1), and the front loudspeaker unit (3) and the right loudspeaker unit (9) are connected in series in a right audio channel (R) of the loudspeaker arrangement (1).To provide a novel and compact loudspeaker arrangement (1), it has a rear loudspeaker unit (16) with a rear radiation axis (17) directed away from the target area, wherein the rear loudspeaker unit (16) and the left loudspeaker unit (6) are connected in series in the left audio channel (L) of the loudspeaker arrangement (1), and the rear loudspeaker unit (16) and the right loudspeaker unit (9) are connected in series in the right audio channel (R) of the loudspeaker arrangement (1), and wherein the left loudspeaker unit (6), the right loudspeaker unit (9) and the rear loudspeaker unit (16) are connected with the same polarity, and the front loudspeaker unit (3) is connected with opposite polarity to the left loudspeaker unit (6), the right loudspeaker unit (9) and the rear loudspeaker unit (16).

The invention discloses a method for drawing a bottom surface disease distribution diagram of a main arch ring of a two-way curved arch bridge. According to the method, arch rib and arch wave numbers, an arch rib local coordinate system, an arch wave local coordinate system, a disease position recording standard, an overall coordinate system, an arch rib disease position description standard, an arch wave disease position description standard and a disease pattern drawing standard are included. On one hand, a set of independent local coordinate system based on a horizontal projection plane is established for each arch rib and arch wave of the main arch ring of the two-way curved arch bridge, on the other hand, a three-dimensional curved surface is expanded into a two-dimensional curved surface along the bridge direction and the transverse bridge direction, and an overall coordinate system reflecting the actual size of the main arch ring is established; local disease coordinates are reflected in the actual position of the main arch ring of the two-way curved arch bridge through coordinate conversion, and accurate disease drawing of the complex three-dimensional curved surface of the main arch ring of the two-way curved arch bridge is achieved.

This invention belongs to the field of data processing technology, specifically relating to a method and system for altitude holding and obstacle avoidance of unmanned aerial vehicles (UAVs) based on multi-channel array laser ranging. The method includes: acquiring multi-channel laser ranging values, attitude angles, and installation offset angles; calculating the cosine of the gravity angle from the attitude angles and installation offset angles, and projecting the vertical depth and horizontal projection of the ranging values; obtaining the gradient deviation by neighborhood difference of the vertical depth sequence, and statistically generating adaptive boundaries to classify terrain points and obstacle points; determining the altitude using the average depth of terrain points, and avoiding obstacles by taking the minimum horizontal projection of obstacle points; when the proportion of terrain points is below a threshold, calculating the control altitude by extrapolating the vertical velocity of inertial navigation and historical altitudes, and then fusing the extrapolated and calculated altitudes. This invention can adaptively distinguish between terrain and obstacles, maintain the stability of altitude holding continuity even when data is missing, and improve flight safety and obstacle avoidance reliability.

This invention relates to the field of digital simulation technology, specifically to a method for three-dimensional visualization modeling of natural resources based on digital twins. The method includes: constructing a discrete computational map based on a real-world three-dimensional model of the target area and geographic information system (GIS) data; projecting the design base of the building information model (BIM) onto the discrete computational map to determine design boundary nodes; performing constraint propagation calculations on the discrete computational map using the design boundary nodes as propagation starting points to determine the cumulative compliance consumption and cumulative horizontal projection distance of each node in the discrete computational map; determining the topology type of each node based on its cumulative compliance consumption, cumulative horizontal projection distance, original terrain elevation, and preset engineering slope parameters; and geometrically reconstructing the discrete computational map based on the topology type of each node to generate a digital twin model that integrates the BIM and the real-world three-dimensional model. This invention simultaneously achieves automatic compliance avoidance and structural closure generation of the slope model.

The invention provides a wafer processing system and method, electronic equipment and a computer medium, and the wafer processing system comprises a wafer polishing assembly which comprises a polishing disc; the eddy current sensor is arranged on the polishing disc, in the wafer polishing process, the eddy current sensor rotates along with the polishing disc to form a circular track, and a first connecting line of the horizontal projection of the center of the polishing disc and the horizontal projection of the center of the wafer intersects with the horizontal projection of the circular track; the horizontal projection of the preset marker intersects with the horizontal projection of the circular track, the position of the marker is kept unchanged, and the marker is used for collecting an eddy current signal in the wafer polishing process; the controller is used for determining a signal included angle of the marker based on the marker signal; determining an angle deviation value between the signal included angle and an actual included angle of the marker; calibrating the wafer morphology characteristic signal according to the angle deviation value; and the control module is used for controlling the wafer polishing assembly to polish the wafer. The accuracy of determining the thickness of the wafer film can be improved.

The invention provides a multi-stream depth reasoning throwing object drop point prediction method and device, equipment and a medium, and the method comprises the steps: reading a configuration file, recognizing the type of an input source, and constructing a hardware acceleration pipeline based on a GStreamer framework; video frames are sent to a GPU video memory, reasoning is performed after preprocessing, and a detection frame, confidence and category information are output; maintaining a sliding window queue for each potential target, performing trajectory association by calculating Euclidean distance and center point offset, and filtering static background noise; monitoring the displacement change of the track in the vertical direction, and triggering drop point judgment when detecting that the vertical displacement is changed from positive to negative and a target is not detected in continuous K frames; calculating the physical distance of a drop point through longitudinal interpolation and transverse projection based on the coordinates of the four points of the calibrated trapezoid; summarizing the plurality of camera candidate drop points, and fusing to obtain a unique drop point result; parallel multi-channel videos are realized; and a real-time frame rate can still be stably achieved under a common industrial camera, and the hardware and deployment cost is reduced.

The invention discloses a method and system for identifying the internal structure of a turbine blade, and relates to the technical field of identification of the internal structure of a hollow turbine blade of a gas turbine, and the method comprises the following steps: firstly, obtaining a DR image of the initial state of the turbine blade, and enabling a tangent line formed by the front edge and the rear edge of the concave side of the blade in the initial state to be perpendicular to a ray beam outgoing direction; then taking tomography sectional views at two positions along the height direction of the blade, identifying the cooling channels and constructing a midpoint connecting line of midpoints of the cooling channels at the same position; rotating the blade until the horizontal projections of the two end points of the midpoint connecting line coincide to form a point P, and acquiring a vertical line passing through the point P and between the angle bisectors of the horizontal projection lines of the two midpoint connecting line; and finally, rotating the blade to enable the vertical line to be parallel to the ray beam outgoing direction, and obtaining a DR image in the state to identify the internal structure. The method does not need a large amount of tomography, can accurately align the detection angle, gives consideration to the recognition precision and efficiency, reduces the detection cost, and is suitable for the rapid and accurate recognition of the internal structure and damage of the turbine blade.

This utility model discloses a bearing surface treatment device, including a housing. A reciprocating lead screw is rotatably mounted inside the housing. A moving block is provided on the reciprocating lead screw, and a spraying mechanism is provided on the moving block. A trigger rod is fixedly connected to the lower end of the moving block. A support tube is fixedly mounted inside the housing, and a rotating mechanism is provided on the support tube. The rotating mechanism includes a support plate rotatably mounted on the support tube. A transmission rod capable of adjusting the rotation of the support plate is provided at the lower end of the support plate. The transmission rod is located directly below the trigger rod, and there is a partial overlap between the transmission rod and the trigger rod on the horizontal projection plane. In this utility model, through the cooperation of the transmission rod and the trigger rod, when the spraying mechanism descends to the bottom of the bearing, the trigger rod will contact the transmission rod and drive it to move downward, thereby causing the support plate to rotate 180 degrees, realizing the automatic rotation of the bearing without manual operation, greatly reducing labor intensity.

The utility model discloses an integral stress photovoltaic flexible support of a fast-assembly limiting structure, which comprises a plurality of groups of steel strand stress structures which are arranged in parallel to form a flexible stress unit, the flexible stress unit comprises a first steel strand and a second steel strand which are parallel to each other, and a plane formed by the first steel strand and the second steel strand forms an inclination angle with a horizontal plane; a full-length rigid rod piece is arranged below the direction perpendicular to the steel strand, the full-length rigid rod piece is in a U shape, turnups are arranged at the tops of two side wings of the U shape, and quick mounting holes are formed in the turnups. The first steel strand is directly installed on the upper surface of the full-length rigid rod piece through a pressing plate. An elevated supporting component is arranged at the intersection of the horizontal projection of the second steel strand and the upper surface of the full-length rigid rod piece, the bottom of the elevated supporting component is directly connected with a quick mounting hole in the full-length rigid rod piece, and the top of the elevated supporting component is connected with the second steel strand through a pressing plate to form a limiting structure; and the relative position of the steel strand under the wind load effect is limited.

This invention discloses a device for detecting the wall thickness of a transparent container, relating to the field of detection technology. It includes a dark chamber with a lid on top, an analysis component, a positioning component on the top of the lid, a light source component fixedly mounted on the side of the dark chamber, and a rotating component at the bottom of the inner cavity. A transparent container body is placed on the rotating component. This invention utilizes the fact that light rays incident at an angle to the surface of the transparent container body undergo two refractions upon passing through and after passing through the medium of the transparent container body, forming a three-segment light ray. The thickness of the medium of the transparent container body can be determined by the horizontal projection distance of the ray in the medium of the transparent container body. Furthermore, based on the known length of the horizontally emitted ray B, the percentage of ray A within the first medium can be calculated, thus yielding the target wall thickness.

The invention discloses a water sampling device and a sampling method, and belongs to the technical field of liquid sampling, the water sampling device comprises: a housing which is of a longitudinal structure, one side of the housing is provided with a door plate capable of being opened and closed, and the peripheral side of the housing is provided with through holes; the sampling assembly comprises a connecting frame arranged in the shell, a plurality of detachable sampling tanks are arranged on the connecting frame and are arranged at intervals in the longitudinal direction, openings are formed in the tops of the sampling tanks, cover plates are rotationally arranged at the openings, rotating shafts of the cover plates are located on the edges of the openings of the sampling tanks and are in a horizontal state, and extension plates are arranged on the outer portions, corresponding to the rotating shafts, of the cover plates; the extension direction of the extension plate is consistent with the radial direction of the cover plate and is perpendicular to a rotating shaft of the cover plate, a shifting block moving in the longitudinal direction is arranged on one side in the shell, and the shifting block coincides with the end, opposite to the extension plate, of the extension plate on the horizontal projection. According to the scheme, water body samples at different depths can be collected at a time, and the sampling efficiency can be improved.

The utility model belongs to the field of transformer part production, and discloses a single-frame iron core storage device which comprises a tray and a supporting piece fixedly arranged on the tray, three supporting faces evenly distributed in the circumferential direction of the tray are arranged on the supporting piece, and the included angle between any two adjacent supporting faces on a horizontal projection plane is 60 degrees. A limiting check block is fixedly arranged at the position, corresponding to the radial outer side of each supporting face, of the surface of the tray, and a clamping space used for containing the single-frame iron core is formed between each limiting check block and the corresponding supporting face; on the horizontal projection plane, the top edge of the supporting face is arranged close to the center of the tray, and the bottom edge of the supporting face is arranged close to the edge of the tray. According to the utility model, three single-frame iron cores with the same energy efficiency grade can be stably stored at one place; the centralized storage device is suitable for the transformer part production industry and used for centralized storage of the three single-frame iron cores before splicing.

A beamless steel bifurcated pipe design method controlled by a waist line break angle based on a geometric method comprises the following steps that firstly, a taper pipe bus of a beamless steel bifurcated pipe is generated through the geometric method with the waist line break angle as a control condition; 2, generating a projection line of the intersecting line of the beamless steel branch pipe through a geometric method; 3, establishing a three-dimensional model of the beamless steel branch pipe by using the taper pipe generatrix in the step 1 and the horizontal projection of the intersecting line in the step 2; and 4, performing finite element analysis based on the three-dimensional model in the step 3, and rechecking and determining waist line reduction and pipe wall thickness. The geometric method is adopted, the steel bifurcated pipe body shape is designed with the waist line break angle as the control condition, and the design efficiency of the water conservancy project can be improved.

The application discloses a vacuum chuck device for silicon wafer detection and relates to the technical field of silicon wafer detection and processing. The device comprises a detector for detecting the thickness of a silicon wafer, a mounting frame and a transmission assembly. A plurality of positioning plates are arranged on the mounting frame. First negative pressure chucks for adsorbing the lower surface of the silicon wafer are uniformly arranged on the positioning plates. The detector is located on one side of the positioning plates. A transfer path is formed between the mounting frame and the transmission assembly. A transfer frame is movably arranged on the transfer path. The transfer frame is located above the first negative pressure chucks. A lifting plate is arranged on the transfer frame. The lifting plate is arranged on the transfer frame in a lifting mode. Second negative pressure chucks for adsorbing the upper surface of the silicon wafer are arranged on the bottom of the lifting plate. The horizontal projection of the second negative pressure chucks coincides with the horizontal projection of the first negative pressure chucks. The device is convenient for nondestructive transfer of the silicon wafer after detection.

The invention relates to a UHPC prefabricated slab which comprises a first pre-embedded assembly, a second pre-embedded assembly and a plurality of steel plates, wherein the first pre-embedded assembly is enclosed by the plurality of steel plates; the second pre-embedded assemblies are arranged in parallel in the longitudinal bridge direction, each second pre-embedded assembly comprises a plurality of T-shaped pieces arranged at intervals in the transverse bridge direction, and the surfaces of the upper flanges of the T-shaped pieces are flush with the upper surface of the steel plate; the shear keys are vertically arranged on the upper surfaces of the steel plate and the T-shaped pieces; the UHPC pouring layer is formed on the upper surfaces of the first embedded assembly and the second embedded assembly in a pouring mode, and the horizontal projection of the UHPC pouring layer is located in the range covered by the first embedded part; the UHPC pouring layer is provided with reserved notches between the adjacent T-shaped pieces in the transverse bridge direction, and at least one row of reserved notches are formed along the center line in the longitudinal bridge direction. The UHPC is adopted, so that the thickness of the prefabricated slab is obviously reduced, the material consumption is reduced, the hoisting weight is reduced, the problems that the reinforced concrete prefabricated slab is difficult to manufacture and the oversized prefabricated slab is hoisted at low cost are solved, and the construction difficulty is reduced.

This invention relates to the field of construction inspection technology and discloses a machine vision-based method for inspecting the construction quality of steel mesh. The method includes: acquiring color images and depth maps of the steel mesh; locating adjacent intersection nodes and the mid-span sag points of the connecting lines; extracting depth values ​​and converting them into three-dimensional physical coordinates; setting the intersection nodes as the local coordinate origin; calculating the difference between the horizontal projected straight-line distance and the relative sag depth; using algebraic analytical methods to simultaneously solve for the coefficients of the local parabolic deflection shape; using the arc length integral analytical method based on these coefficients to obtain the true physical arc length of the steel reinforcement; and finally calculating the relative error ratio between the actual arc length and the standard spacing to output the judgment result. This invention effectively eliminates the projection shortening error caused by local steel reinforcement sag, the calculation process requires no iterative optimization, the data logic is strictly self-consistent and closed-loop, and high-precision true spacing detection is achieved.

The application relates to the technical field of data processing, and discloses a Unity game user behavior data mining method and system, which comprises the following steps: reading constant configuration parameters and a three-dimensional instantaneous speed vector, performing horizontal projection on the three-dimensional instantaneous speed vector, establishing a moving unit vector and a braking buffer distance; constructing a resource metadata collision body, assigning a resource identifier, establishing a proxy physical layer, determining a line-of-sight movement alignment factor, combining the braking buffer distance, establishing a resource detection ray cluster, detecting the proxy physical layer by using the resource detection ray cluster, determining a throughput demand according to a detection result; determining an available loading bandwidth of a physical simulation update frame, combining the throughput demand, and determining a scheduling strategy of the system. The application can effectively balance the character motion intention and the limited system processing capacity.

This utility model belongs to the technical field of food waste treatment, and relates to an adaptively adjustable grease trap and dehydration structure for food waste. It includes an inlet pipe and a grease trap funnel, with the funnel located below the outlet of the inlet pipe. A baffle, whose opening responds to fluid impact force, is hinged to the outlet of the inlet pipe. The upper end of the baffle is hinged to the top of the inlet pipe end face, and its horizontal projection plane covers the outlet of the inlet pipe. The rotation angle range of the baffle is limited by a limiting structure: its minimum angle with the vertical plane is greater than 0°, and its maximum angle ranges from 15° to 45°. The adaptively adjustable grease trap and dehydration structure for food waste provided by this utility model is compact, anti-clogging, and odor-proof. Through the design of the dynamic baffle, it can effectively solve the problem of grease trap clogging.

The invention belongs to the field of petroleum logging, and discloses a logging data identification method and related equipment suitable for a logging software interface, and the method comprises the steps: collecting a to-be-identified logging software interface image, and carrying out the separation processing of the image with a symbol as a basic unit, thereby simplifying the identification process; and the horizontal projection data and the vertical projection data of each symbol image are calculated and compared with symbol characteristics learned in advance, so that the logging data can be quickly and accurately recognized, complex font sizes and font changes do not need to be considered, the recognition speed is remarkably increased, and the recognition efficiency is improved. The requirements of double requirements on rapid change and accuracy of data in a real-time logging process are met; by adopting the method, the problems that an existing logging data recognition mode is low in recognition speed and cannot adapt to rapid change of real-time logging data due to the fact that factors such as font sizes and fonts are considered can be solved, the recognition speed is high, and the recognition accuracy is high; and the accuracy and reliability of logging data acquisition are improved.

The invention discloses an ultra-large-diameter expansion bend underwater measurement accurate correction method, and belongs to the technical field of submarine pipeline expansion bend underwater installation. Measuring the left and right angle readings of the riser flange and the subsea pipeline flange, the readings of the tensiometer and the linear distance between the riser flange and the subsea pipeline flange by a measuring device; the two water pressure altimeters are arranged in the three-point directions of the vertical pipe flange and the subsea pipe flange respectively, and the average height difference, namely the absolute height difference of the two, is read; the underwater gyroscopes are sequentially arranged right above the underwater gyroscopes and the underwater gyroscopes, and absolute heading readings are collected; the linear distance between horizontal projections of the two flanges can be deduced according to the length of the tensioning steel wire and the absolute height difference, then the absolute position relation of the two flanges on the horizontal projections can be obtained according to the absolute heading and left-right angle readings of the horizontal projections of the two flanges, and accurate correction of the left-right angle readings of the expansion bend underwater measuring device is achieved. According to the method, the underwater measurement data of the ultra-large expansion bend are extremely accurate, the butt joint difficulty of the expansion bend and the subsea pipeline is greatly reduced, and the butt joint working efficiency is improved.

The invention discloses a piling perpendicularity and height detection method and related equipment. The method comprises the steps that two pieces of detection equipment are arranged on the two sides of a pile body to be detected correspondingly, and orientation angle calibration is conducted; a double-view-angle real-time image of the pile body in the piling process is obtained, and distortion correction is conducted in combination with the pitch angle and the distortion compensation model; the actual horizontal distance between the pile body and the detection equipment is determined according to the segmented focal length lookup table; a pile body is tracked through a target detection model and the fine-tuned image segmentation large model, and the penetration depth is calculated in combination with the change of the pitch angle; and calculating a space inclination angle and a horizontal projection azimuth angle of the pile body according to the magnetic azimuth angles and the pitch angles of the double devices, thereby determining the perpendicularity of the pile body and performing visual display. According to the embodiment of the invention, high-precision detection of the perpendicularity and the penetration depth of the pile body can be realized by combining the edge calculation unit and the image segmentation large model, and the precision and the real-time performance of piling construction monitoring are improved. The method can be widely applied to the technical field of piling detection.

The utility model discloses a water load pressurizing structure and a water load pressurizing device. The water load pressurizing structure comprises lattice frame pieces and water storage pieces, the lattice frame pieces are provided with upper openings, stacking spaces and containing spaces which are sequentially communicated from top to bottom, the upper openings are used for placing the water storage pieces, the stacking spaces are used for placing the other lattice frame pieces, and the water storage pieces are placed in the containing spaces; the horizontal projection boundary of the stacking space is located on the outer side of the horizontal projection boundary of the containing space. According to the invention, water is used as a main pressurized carrier, and compared with earthwork as a pressurized carrier, the method has the significant advantages of low cost, easy acquisition, no transportation link, environmental protection and the like; meanwhile, the loading pressure is convenient to adjust and operate. The loading pressure can be controlled according to the number of stacked layers, and the loading pressure can be flexibly adjusted by discharging water and injecting water into the water storage bag.

The utility model belongs to the technical field of water conservancy projects, and particularly relates to a differential type stilling well structure used for large water level fall and poor side slope geological conditions, which comprises an inlet, a well body, a bottom plate and an outlet which are sequentially connected along the water flow direction, the well body is of a vertical or inclined cylindrical or box-shaped structure, the inlet is communicated with the upper part of the well body, and the bottom plate is communicated with the outlet. The bottom plate is arranged at the bottom of the well body and communicated with the outlet, the inlet and the outlet are arranged in a staggered mode on the horizontal projection plane, a unique water flow path is formed through inlet and outlet staggered and well type construction, and sufficient disturbance energy dissipation of water flow in each stage of stilling well can be achieved without depending on a large building. The problems that in a traditional scheme, energy dissipation is insufficient, the structural size is large, stability is difficult, and the manufacturing cost is high are solved.

The present application belongs to the technical field of physical gravity test equipment, and relates to a physical gravity experiment simulation device. The device comprises a main body, an inclined plane belt, a distance measurer, a launching assembly and a limiting rod. In a natural state, a second counterweight moves downward, and the second counterweight drives a first counterweight to move upward through the inclined plane belt. The thickness of the inclined plane belt gradually decreases from one end provided with the first counterweight to the other end provided with the second counterweight. The side of the inclined plane belt away from the inclined plane is a plane and close to the main body. The limiting rod is used to control the movement of the inclined plane belt. The device can visually show the actual trajectory of the marble, so that students can intuitively understand the trajectory of the object in the horizontal projection motion. The setting of the inclined plane belt can control the distance of the upward movement of the first counterweight by controlling the distance between the limiting rod and the main body, and the control precision is high. The inclined plane belt is arranged on both sides of the main body, and the size of the simulation device in the vertical direction is not increased.

The invention belongs to a rapid drawing method, and particularly relates to a rapid drawing method for two extrapolation points, perpendicular to a straight line, of a sandstone type uranium mine plane graph. The method comprises the following steps: S1, setting a ten-digit code of a working area; s2, determining an arbitrary engineering point and an arbitrary engineering straight line in the working area plan; S3, determining an extrapolation distance mode in which the arbitrary engineering point is vertical to the arbitrary engineering straight line in the working area plan; s4, calculating; s5, solving an azimuth angle; and S6, solving an extrapolation point. The method has the advantages that the method is suitable for rapidly drawing the two extrapolation points, perpendicular to the straight line, of all kinds of sandstone type uranium mine plane graphs, and is particularly suitable for compiling, storing and managing electronic and digital ore body horizontal projection graphs, the collected data is reliable in precision, labor intensity is relieved, and the method is simple, rapid, economical and feasible.