166 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 relates to the technical field of ultrasonic scanning, in particular to a feeding and discharging mechanism for sheet base material ultrasonic scanning equipment, which comprises a rack, a feeding belt and a conveying belt are arranged on the rack, a clamping and plugging frame for bearing a base material is conveyed on the feeding belt, an overturning table is arranged between the feeding belt and the conveying belt, an overturning block is rotatably connected to the overturning table, and the overturning block is provided with a clamping and plugging groove. The overturning block is fixedly connected with an overturning frame, the overturning frame comprises two long rods used for bearing the bottom plate and two short rods used for bearing the baffle, and the long rods are provided with a plurality of idler wheels. The base materials are inserted into the clamping plug frame in a stacked mode, the base materials are separated one by one through the base grooves, the horizontal projection area of the clamping plug frame is small, the whole clamping plug frame is of a cubic structure, the occupied space is small, and carrying is convenient.

The invention discloses die bonding equipment, and relates to the technical field of die bonding. The die bonding equipment comprises a rack, a die taking and pasting mechanism and a dispensing mechanism, and the die taking and pasting mechanism and the dispensing mechanism are both arranged on the rack. The wafer taking and pasting mechanism comprises a wafer disc, an overturning group and a pasting group which are continuously distributed along a first space axis; and the dispensing mechanism comprises a dispensing group and a chip mounting group which are continuously distributed along the axis of the second space. According to the technical scheme, the wafer disc, the overturning set and the chip mounting set of the wafer taking and chip mounting mechanism are continuously distributed along the first space axis, then the dispensing set and the chip mounting set of the dispensing mechanism are continuously distributed along the second space axis, and the first space axis and the second space axis are arranged in a spatial non-coplanar mode. The first space axis and the second space axis form the adjustable inclined included angle on the horizontal projection plane, the longitudinal space is effectively utilized, waste of the longitudinal space is reduced, and the space utilization rate is improved.

The invention relates to the technical field of industrial nondestructive testing, in particular to a wall thickness detection device and method based on a dual-ray system, and the method comprises the steps: synchronously shooting vertical and horizontal projection images of a pipe through a dual-ray source; extracting first line gray data of the bidirectional projection image, and capturing an edge position through an automatic threshold method; grabbing inflection points of the inner wall and the outer wall of the pipe according to the edge position, and totally obtaining eight inflection points; calculating inner and outer diameters of the pipe by using a mathematical model based on the inflection point position Calculating the wall thickness, the ovality, the eccentricity value and the concentricity according to the inner diameter and the outer diameter; according to the invention, full detection in the pipe production process is realized, the detection efficiency is high, the influence of slight shaking of the pipe can be resisted, the detection result is accurate, and the device is suitable for detecting the wall thickness and related quality indexes of linear materials such as PVC pipes and cables.

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.

The application relates to a wireless table structure recognition method and device, equipment, a storage medium and a program product, and relates to the technical field of image recognition. At least one content contour is extracted from a target table image; noise removal processing is performed on each content contour to obtain at least one content region; clustering processing is performed based on the center points of each content region to determine a plurality of cell blocks; horizontal projection is performed on the plurality of cell blocks, and row coordinate information is determined according to the horizontal projection result; vertical projection is performed on the plurality of cell blocks, and column coordinate information is determined according to the vertical projection result; and the table structure is determined according to the row coordinate information and the column coordinate information. The method can reduce noise interference and improve the accuracy of wireless table structure recognition. The plurality of content regions in a cell are subjected to clustering processing, the table cell region can be accurately obtained, deep learning algorithms are not required, resource consumption is low, and the wireless table structure can be simply and effectively recognized.

The utility model provides a balancing block for reducing flow hysteresis resistance, a dynamic balance assembly and a compressor, the balancing block comprises a base and a counterweight part, the base comprises a first connecting part with a crankshaft hole in the middle and a second connecting part surrounding the first connecting part, the balance weight part extends outwards from the upper end face of the second connecting part in the axial direction of the crankshaft hole, the two ends of the balance weight part are a first windward face and a first leeward face respectively, the upper end face of the second connecting part serves as a first plane, and the horizontal projection of the balance weight part falls into the first plane. According to the balance block capable of reducing the flow hysteresis resistance, through cooperation of the base and the balance weight part, the area of the windward side can be effectively reduced, and then the generated flow hysteresis resistance is reduced. The balance block capable of reducing the flow hysteresis resistance is simple in overall structure, and the problem that in the prior art, when a balance block rotates, due to the fact that the large windward area is achieved, large flow hysteresis resistance is generated, and additional energy loss is generated in the movement of a compressor is solved.

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.

The application provides a steel pipe multi-line handwritten character detection method and device, electronic equipment and storage medium, relates to the technical field of steel pipe handwritten character detection method, and comprises the following steps: extracting a multi-line handwritten character region on a steel pipe image to obtain a character region image containing multi-line handwritten characters; converting the character region image into a gray scale image; equally cutting the gray scale image along the vertical direction to obtain a plurality of vertical segment images; obtaining a corresponding projection curve for each vertical segment image by using a horizontal projection method, and determining a character line region of each line of characters according to the projection curve of the vertical segment image; extracting a single character region in the character line region; and performing character recognition on the single character region on the steel pipe image by using a preset recognition model to obtain a recognition result. The application can be applied to the recognition of handwritten characters on a steel pipe in an actual production process, and can efficiently and accurately recognize handwritten characters on the steel pipe.

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 device and method for integrally assembling complex structure external parts, the device comprises an axial positioning assembly, and a first positioning block, a second positioning block, a third positioning block and a fixing ring which are arranged on the axial positioning assembly, the fixing ring is used for being connected with a to-be-machined part, and the first positioning block, the second positioning block, the third positioning block and the fixing ring are arranged on the axial positioning assembly. The first positioning block, the second positioning block and the third positioning block are all used for positioning an external part, limiting plates or protruding blocks are arranged on the first positioning block, the second positioning block and the third positioning block, and selection of the limiting plates or the protruding blocks is based on the structural shape of a preset abutting area of the external part; according to the method, on the basis of the horizontal projection positions of the external part on the shell to be machined, the median of all the projection positions is selected as the distinguishing line, the corresponding first positioning block or fourth positioning block is matched for the external part on the basis of the distinguishing line for auxiliary positioning, and by selecting the positioning blocks of different structures, structural interference can be reduced; and meanwhile, more welding operation space for the surface of the shell to be machined can be provided.

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 application discloses an ergonomic chair cushion depth adjustment control method, comprising the following steps: collecting the instantaneous subsidence profile of the rear part of the cushion sponge in real time through the zoned deployment of the subsidence depth detection unit, and obtaining the initial subsidence evaluation result by combining the sponge rebound recovery form obtained after unloading with the rebound response detection unit; calculating the horizontal projection shortening length according to the instantaneous subsidence profile and the sponge rebound recovery form, determining the permanent collapse sign of the part with the horizontal projection shortening length exceeding the elastic recovery limit, and obtaining the forward stroke adjustment range accordingly; matching the horizontal projection shortening length with the forward stroke adjustment range, determining the necessary amplitude of the slide rail forward push corresponding to the area where the permanent collapse sign is located as the seat depth adjustment scheme; driving the slide rail to execute the forward push action according to the forward push control signal, synchronously collecting the horizontal projection length and the knee rear side gap state after execution, and obtaining the adjusted subsidence recovery seat depth stability by combining the rebound change.

The application discloses a kind of angle measurement method, device, equipment and storage medium of double-inclined angle plate piece, the method comprises: the angle plate piece of two-way inclined structure in ship is modeled, respectively original near center line, original angle line and original upper edge line vertical projection in plan view, obtain vertical near center line, vertical angle line and vertical upper edge line, then horizontal projection to horizontal near center line, horizontal angle line and horizontal upper edge line, according to vertical near center line, vertical angle line and vertical upper edge line, and horizontal near center line, horizontal angle line and horizontal upper edge line construct the angle of angle plate piece angle line method surface angle, finally measure the degree of angle line method surface angle as the angle of angle plate piece. With the normal angle of double-inclined angle plate piece as processing basis, accurate reference is provided for angle rolling processing, the processing difficulty of double-inclined angle plate piece is reduced, the lofting development efficiency of double-inclined angle plate piece is effectively improved, and production cost is saved.

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.

The utility model relates to the technical field of automobile part detection tools, in particular to a longitudinal beam assembly detection tool, which comprises a detection table and an end limiting assembly fixed on the detection table. The end part limiting assembly comprises a base fixed on the detection table, a sliding rail fixed on the base, a sliding block connected to the sliding rail in a sliding manner, a sliding plate fixed on the sliding block, a middle arm fixed on the sliding plate and a positioning block fixed at the end part of the middle arm; a limiting block is further fixed to the base, upward bosses are arranged at the two ends of the limiting block, limiting holes are formed in the bosses, a transverse protrusion is arranged on the edge of the sliding plate, a limiting rod is arranged on the transverse protrusion, and the limiting rod can be inserted into the limiting holes in the bosses to lock the position of the sliding plate. According to the detection tool, the end limiting structure is arranged, so that the longitudinal beam is accurately and stably positioned during detection, the position of the longitudinal beam on the detection table is prevented from deviating, accurate detection of the hole site is realized, and the consistency and the accuracy of the detection result are improved.

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 utility model relates to the technical field of guide rail straightness measurement, and discloses a long guide rail straightness measuring system which comprises a level gauge and a measuring device, a swing part and a scale are arranged in the measuring device, and a first marking assembly and a second marking assembly are arranged at the two ends of the swing part respectively. The first marking assembly and the second marking assembly are provided with a first marking line and a second marking line respectively, the ruler is arranged at one end of the measuring device, the horizontal distance between the second marking line and the swing axis of the swing part is a times of the horizontal distance between the first marking line and the swing axis of the swing part, and a is larger than 1. The horizontal projection of the swing axis of the swing piece is located on the 0 scale line of the ruler. When the measuring device is located at the deformation position of the guide rail, the swing piece is driven to swing so that the first marking line can coincide with the horizontal line of the level gauge, the vertical distance between the second marking line and the zero scale of the scale is a times of the deformation quantity of the guide rail, the deformation quantity of the guide rail is amplified by a times so that a worker can read conveniently, and precision is improved.

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 embodiment of the utility model provides evaporation equipment which comprises an evaporation tank, the evaporation tank comprises a tank bottom and side plates, the horizontal projection of the tank bottom is rectangular, and the side plates are fixedly connected to four side edges of the tank bottom; the evaporation tank comprises a high-temperature section and a transition section, and the upper surface of the tank bottom is a plane within the range of the high-temperature section; within the range of the transition section, the upper surface of the groove bottom is an inclined surface, and the lower end of the inclined surface is connected with the plane; the high-temperature section is connected with the first heating assembly, the transition section is connected with the second heating assembly, and the set temperature of the first heating assembly is higher than that of the second heating assembly. After the technical scheme is adopted, the aluminum material in the molten state does not need to be directly evaporated from a solid state like a traditional technology, the aluminum material in the molten state is input into the evaporation tank, then the aluminum material in the liquid state is heated for evaporation, and the problem of aluminum material sputtering frequently occurring in existing operation is avoided.

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.