11 results about "Metal sphere" patented technology

The application belongs to the technical field of low-altitude aircraft detection, and particularly relates to a static electricity radar device for low-altitude aircraft detection and a working method thereof. The device comprises: a metal spherical shell configured to be grounded; an insulating material arranged on the surface of the metal spherical shell; a plurality of static electricity sensing electrodes embedded in the insulating material, the plurality of static electricity sensing electrodes being arrayed on the surface of the metal spherical shell, and the normal directions of the plurality of static electricity sensing electrodes converging at the geometric center of the metal spherical shell; and a signal processing module comprising a gating unit, a conditioning unit and a processing unit. The gating unit is connected to the static electricity sensing electrodes and is used for selecting specified static electricity sensing electrodes to be connected to subsequent circuits in time. The conditioning unit is configured to convert the induced charge signals into voltage signals and amplify and filter the voltage signals. The processing unit receives the digitized static electricity signals, and analyzes the spatial pose information of the low-altitude aircraft according to the signal intensity difference of different static electricity sensing electrodes. The spatial positioning of the low-altitude aircraft is realized by using the static electricity sensor array.

This utility model relates to the technical field of rail vehicle components and discloses a uniformly stressed rubber stack for rail vehicles, including a support base. A central metal sphere is fixedly installed inside the support base. A first rubber layer is fixedly installed on the outer side of the central metal sphere. A first supporting sphere is fixedly installed on the outer side of the first rubber layer. A second rubber layer is fixedly installed on the outer side of the first supporting sphere. A second supporting sphere is fixedly installed on the outer side of the second rubber layer. This uniformly stressed rubber stack for rail vehicles has a cylindrical support plate with a first and second inclined surface, reducing stress concentration. Through a multi-layer metal reinforcement structure design, local stress concentration is reduced, dynamic load transfer efficiency is improved, and the longitudinal and lateral stiffness of the rubber stack is increased, resulting in uniform stress distribution, extended service life, longer replacement cycles, lower failure rates, and reduced maintenance costs.

The application discloses a kind of preparation mould of porous hollow metal ball, including upper die punch with upper concave hemisphere and lower die punch with lower concave hemisphere, and upper half screw rod and lower half screw rod are arranged on upper die punch and lower die punch, and bolt hole is opened.Therefore, the application also discloses a kind of preparation method of porous hollow metal ball, metal powder feed is loaded into mould after heating, then start rotating, finally high temperature heat treatment is carried out, and porous hollow metal ball is obtained.The application is combined by upper die punch and lower die punch with multiple concave hemispheres on the surface, and multiple porous hollow metal balls are prepared at a time, with high production efficiency, low preparation cost, the size and wall thickness of the prepared porous hollow metal ball are regulated according to application environment, and the surface of the porous hollow metal ball is smooth, with metallic luster, high sphericity, which can meet the demand of heat insulation, sound insulation and other materials and components in automobile, aerospace, steel metallurgy, nuclear industry and other fields.

This invention relates to the field of metal detectors, specifically a method for predicting the accuracy of a metal detector. The method includes: setting the frequency of the electromagnetic field between the probe coils of the metal detector to a preset low-frequency frequency; obtaining the first resistance change and the first reactance change of the probe coils when a product sample passes through the electromagnetic field; calculating the dielectric loss factor and capacitive coupling factor of the product sample; calculating the predicted resistance change and predicted reactance change values ​​of multiple metal spheres; obtaining the principal characteristic vector of the product sample, and obtaining resistance change thresholds and reactance change thresholds based on the principal characteristic vectors; and determining the minimum diameter among all metal spheres whose predicted resistance change value is greater than the resistance change threshold or whose predicted reactance change value is greater than the reactance change threshold as the accuracy of the metal detector. This invention avoids the prediction bias caused by neglecting product effects in traditional methods.

A locking angle (8) for a vending machine (1) having a closed housing with an interior for storing merchandise, wherein the housing has at least one housing body (2) and a housing door (3) pivotally connected to the housing body (2), and with at least one main lock (60) and an additional secondary lock (61), wherein the housing door (3) can each be locked to the housing body (2) by means of the main lock (60) and the secondary lock (61), wherein the locking angle (8) is configured to extend from the front (34) of the housing door (3) in an angle shape to over part of a housing side wall (20, 21, 22, 23) of the housing body (2) and, in the closed state of the housing, to at least partially cover both the main lock (60) and the secondary lock (61), characterized by at least one of the following features a), b), c), d): a) the locking angle (8) has at least one base body (100),which is designed as an angled sheet metal component having a first wing (101) and a second wing (102) extending at an angle to the first wing (101), wherein at least one first fastening element (103) for screwing the base body (100) to the housing door (3) is provided on the first wing (101) and at least one inner bracket (106) for the secondary lock (61) is provided on the second wing (102), wherein the locking angle (8) has at least one hood body (80, 110) which is designed as an angled sheet metal component having a third wing (111) and a fourth wing (112) extending at an angle to the third wing (111), wherein the third wing (111) is arranged overlapping with the first wing (101) of the base body (100) and a cover hood (113) is formed on the fourth wing (112) through which the second wing (102) of the base body (100) or at least the inner bracket (106) for the secondary lock (61) is at least partially covered,b) The closing angle (8) has a first ball receiving chamber (83) which is configured to receive a plurality of metal balls, wherein the first ball receiving chamber (83) is filled with metal balls and the metal balls are movably received in the ball receiving chamber; c) The closing angle (8) has a cover body (120) which is designed as an angled sheet metal component having a fifth wing (121) and a sixth wing (122) extending at an angle to the fifth wing (121), wherein the fifth wing (121) covers at least a part of the third wing (111) of the hood body (80, 110) and the sixth wing (122) covers at least a part of the fourth wing of the hood body (80, 110); d) The closing angle (8) has a cover (80) designed as a sheet metal component which is shaped like the cover hood (113) and is attached to the outside of the cover hood. (113) is set up.

The application discloses a holder and a projection support. The holder comprises a metal shell with a cavity opening upward; a plastic support is arranged in the cavity and has a first spherical groove opposite to the opening of the cavity; a plastic top pressing block has a second spherical groove opposite to the opening of the cavity; a metal ball head is arranged in the metal shell and connected with a mounting table extending out of the cavity; a first locking member is threadedly connected to the side of the metal shell, one end of which extends into the metal shell and can push the plastic top pressing block so that the metal ball head abuts against the first spherical groove, the second spherical groove and the inner wall of the metal shell, so that the photographic equipment on the metal ball head can be stably arranged on the holder, and the material cost is low. The projection support comprises a flat plate mounting seat and a connecting rod, and the connecting rod is provided with the holder. The projection support is low in cost, stable and reliable in connection with the photographic equipment, the flat plate mounting seat can be arranged on a desktop, a floor, a side wall and a ceiling, and is widely used.

This invention discloses a near-field RCS measurement calibration method based on scattering center topological mismatch compensation. Addressing the systematic error problem introduced by the mismatch between the distributed scattering characteristics of the complex target and the ideal point source calibration body when using traditional metal sphere calibration, a physical model of calibration error incorporating near-field spherical wave effects is established. The method preprocesses data by extracting scattering centers and removing outliers, generates a global initial search point set using feature analysis of the error function sensitivity tensor, and performs local precise optimization using an improved parallel LM algorithm. Finally, it obtains the optimal spatial position parameters of the target that minimize measurement error. This method effectively compensates for RCS amplitude oscillations and phase distortion caused by phase center mismatch, reducing the root mean square error (RMSE) of RCS measurements for complex targets such as ship hulls from approximately 15% to below 5% in the Ka-band, significantly improving the accuracy and reliability of electromagnetic scattering characteristic measurements in the field and anechoic chamber.

The application provides a flat composite brazing filler metal and a preparation method and application thereof, and belongs to the technical field of brazing filler metals. The application is provided with multiple uniformly distributed through holes and metal balls embedded in the through holes on the flat brazing filler metal; the shape of the through holes is at least one of an ellipse and a polygon, the area ratio of the through holes to the large circle area of the metal balls is 2-8, the melting point of the metal balls minus the melting point of the brazing filler metal is greater than or equal to 200 DEG C, and the diameter of the metal balls is the same as the thickness of the flat brazing filler metal. The application embeds the metal balls in the through holes on the flat brazing filler metal, improves the uniformity of the welding layer thickness, and reduces the welding cavity rate.

The wind-resistant universal electric vehicle cover (series models) is a revolutionary technological upgrade product. It consists of a parachute storage box, lifting rotor, inertial metal spheres (1×4), a disc generator (high power, high speed), a wind-resistant cover (spherical shape), an airflow reverse thrust baffle (bowl shape), an electric fan duct (trumpet shape), a circular plate, bushings (for power steering), and front and rear wheel support frames (1×2). The parachute storage box is fixed to the top of the disc generator shaft. Wind-resistant blades (1×4) are fixed to the edge of the generator rotor, and inertial metal spheres (1×4) are hung on the outer edges of the blades. The wind-resistant cover (spherical shape)... The circular plate is fixed with a bushing (power steering) at the center of the circular plate. The front and rear wheel support frames (1×2) are fixed at the front and rear of the circular plate, and then the support frames (1×2) are fixed on the central axle of the front and rear wheels. The airflow reverse thrust baffle (bowl shape) is fixed at the rear edge of the circular plate. The electric fan duct (trumpet shape) is fixed at the rear of the circular plate near the airflow reverse thrust baffle. It has nine major functions: wind resistance, land and air use, automatic parachute deployment in case of malfunction, vertical take-off and landing, inertial ball to increase speed and force, hoisting, spraying, carrying people, carrying goods, and promoting the rapid development of low-altitude economy.