106 results about "Metal sphere" patented technology

The invention discloses a phased array weather radar calibration method based on a generalized metal ball calibration theory. Comprising the following steps: in a microwave anechoic chamber, collecting two-dimensional antenna pattern data of a phased array weather radar in at least one working mode and pointing to a plurality of different beams; performing numerical integration on the two-dimensional antenna pattern data, calculating a combined beam main lobe solid angle of the transmitting antenna and the receiving antenna, and calculating an equivalent beam width product; calculating a calibration theoretical reflectivity factor of the metal ball based on the product of the theoretical radar scattering sectional area and the equivalent beam width of the metal ball; actual detection echo data of the phased array radar on the metal ball under different working modes and beam pointing is acquired, and an actual reflectivity factor is calculated; and comparing the actual reflectivity factor with the calibration theoretical reflectivity factor to complete calibration of the phased array weather radar. Aiming at the non-Gaussian working mode of the phased array weather radar, the reflectivity factor of the phased array weather radar can be quantitatively evaluated, and the radar detection performance is improved.

The invention provides a metal ball calibration device and method applied to a millimeter wave ceilometer, and the device comprises an upper pedestal which is fixed at the bottom of the millimeter wave ceilometer; the lower base is fixed on the ground and is rotationally connected with the upper base; the end part of a main body of the driver is hinged in the lower base, and the end part of a driving part of the driver is hinged in the upper base. According to the technical scheme, conversion of the millimeter wave ceilometer between the calibration state and the working state can be achieved, and when the millimeter wave ceilometer is calibrated, by inclining the angle of the millimeter wave ceilometer, on one hand, the length of the rope between the unmanned aerial vehicle and the metal ball can be reduced; the length of the rope meets the requirement that the unmanned aerial vehicle is located outside the beam irradiation range of the millimeter-wave ceilometer; as the unmanned aerial vehicle is located outside the beam irradiation range, interference sources are reduced, and the test precision is improved; furthermore, due to the reduction of the length of the rope, the controllable degree of the unmanned aerial vehicle on the metal ball is also improved, the accuracy of position control on the metal ball is greatly improved, and the test efficiency is improved.

The invention discloses a metal ball anti-swing method for metal ball calibration of a meteorological radar, and relates to the field of meteorological radars, comprising the following steps: S1, acquiring related information of a metal ball, a flying position and a radar; s2, determining a second rope length between the metal ball and the damping object according to the first rope length and the radar; s3, the mass of a damping object is determined according to the mass of the metal ball, and the shape of the damping object is determined; s4, the two ends of a connecting rope with the second rope length are connected with the metal ball and the damping object correspondingly; s5, the unmanned aerial vehicle is released at the releasing position, and at the beginning of releasing, the overall shaking amplitude of the metal ball and the damping object is reduced; according to the method, the influence of environmental wind and unmanned aerial vehicle movement on the stability of the metal ball is reduced to the greatest extent, the swing amplitude of the metal ball in the air is reduced, the time spent on aligning the antenna to the metal ball is shortened, and the accuracy of a calibration result is improved.

The invention provides an induction melting feeding ultrasonic atomization pulverizing system and method, and belongs to the technical field of metal powder material preparation. The induction melting system is used for melting metal raw materials, generated metal melt is sprayed out through a nozzle and drips on an ultrasonic vibration workbench, inert gas is ionized through a tungsten needle electrode tip in the plasma electric arc melting system, the dripped melt which is not atomized in time and cooled is assisted to continue to be heated, and the molten metal is melted. Under the action of ultrasonic atomization vibration, the melt liquid level is broken to generate a molten pool. And under the action of ultrasonic waves, molten liquid in the molten pool is broken to generate small fog drops, and the fog drops are rapidly cooled under the action of surface tension in the inert gas environment to form the metal spherical powder. Continuous operation of ultrasonic atomization powder preparation can be achieved, the conditions of hollow powder and satellite powder are reduced, and the prepared metal spherical powder has the advantages of being high in sphericity degree (larger than or equal to 0.95), high in compactness (larger than or equal to 99%) and narrow in particle size distribution (smaller than or equal to 60 micrometers).

The invention discloses a weather radar metal ball calibration precision improving method, and belongs to the technical field of metal ball calibration, and the method comprises the following steps: carrying out the quantification of a background clutter error of a metal ball calibration position, and removing the background clutter error in the calibration process: constructing a metal ball stability model, and carrying out the calibration of the metal ball stability model; dynamic errors caused by swinging of the metal ball body are quantified and compensated; after the background clutter error is removed and the stability of the metal ball meets a certain condition, the deviation error of the metal ball from the beam center is quantized and compensated; and meanwhile, the cross-library phenomenon of the metal balls is identified, adjusted and compensated. According to the method, the calibration precision of the metal ball of the weather radar is improved.

A method for improving axial movement of a main ball seat of a flange connection V-shaped thrust rod is characterized in that the main ball seat adopts a metal ball joint, an outer spherical inner sleeve of the metal ball joint is pressed in a shell of the main ball seat of the V-shaped thrust rod, and an inner spherical outer sleeve is pressed on a mandrel of the main ball seat; the bottom of the outer spherical inner sleeve and the bottom of the inner spherical outer sleeve are limited and positioned by an inner hole step of a main ball seat shell of the V-shaped thrust rod and a lower step on a main ball seat mandrel respectively, and axial elastic compensation devices are arranged on the upper portion of the outer spherical inner sleeve and the upper portion of the inner spherical outer sleeve respectively. The axial clearance of the outer spherical inner sleeve and the inner spherical outer sleeve is eliminated through axial compensation of the axial elastic compensation device, and axial movement of the outer spherical inner sleeve and the inner spherical outer sleeve during operation is prevented. The axial elastic compensation devices are arranged at the upper parts of the outer spherical inner sleeve and the inner spherical outer sleeve of the metal ball joint of the main ball seat, so that the axial movement of the outer spherical inner sleeve and the inner spherical outer sleeve during operation is eliminated, the structure is simple and practical, and the noise generated by the axial movement of the main ball seat can be effectively eliminated.

The invention relates to a geometric parameter calculation and performance evaluation algorithm based on an integrated motif, which is applied to the integrated motif comprising a geometric parameter calculation module, a spatial resolution module, a contrast module, a uniformity module and a spatial accuracy module. Comprising the following steps: calculating geometric parameters of a CBCT system by using position information of a metal ball in a geometric parameter calculation module and known information; acquiring a line spread function of the metal wire by using position information and known information of the metal wire in the spatial resolution module, and then calculating the spatial resolution; sampling by using position information and known information of an annular insertion block in the contrast module; automatically selecting a center area and a peripheral area of a uniformity module to carry out gray value average value calculation to obtain uniformity information of the image; and the distance and the included angle between the positioning small holes are calculated by using the position information of the positioning small holes in the space accuracy module and known information. According to the invention, high-frequency, high-precision and low-cost performance evaluation requirements in the research and development process can be met.

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.

The invention discloses a preparation method of high-purity refractory metal spherical powder, which comprises the following steps: preparing high-purity refractory metal of which the initial shape is a block, cleaning and drying the refractory metal, smelting the refractory metal into alloy metal liquid, carrying out vacuum suction casting on the molten metal liquid, pouring a material into cooling water after suction casting is completed, and carrying out ingot casting and cooling, so as to obtain the high-purity refractory metal spherical powder. After the cast ingot is cooled, a metal bar is obtained, and finally the metal bar forms refractory alloy powder; the prepared powder is sprayed out through smelting atomization equipment, refractory alloy powder is put into a radio frequency induction plasma device, technological parameters are adjusted, and spherical powder is obtained; oxidation and impurity introduction of powder in the machining process can be effectively reduced through the radio frequency induction plasma device; when the refractory metal spherical powder is prepared, melting or spheroidizing can be achieved only when the metal powder reaches the specific temperature, the metal material can be rapidly and evenly heated through the high-frequency magnetic field effect of radio frequency induction heating, and temperature fluctuation is reduced.

The utility model provides a calibration auxiliary device applied to a millimeter wave ceilometer, and the device comprises an upper pedestal which is fixed at the bottom of the millimeter wave ceilometer; the lower base is supported on the ground and is rotationally connected with the upper base; the sliding rail is fixed on the upper surface of the lower base; the sliding block is arranged in the sliding rail and is in sliding connection with the sliding rail; one end of the supporting rod is hinged to the bottom surface of the upper base, and the other end is hinged to the sliding block; the screw is arranged in the sliding rail, one end of the screw is rotationally connected with the sliding rail, and the screw penetrates through the sliding block and is in threaded connection with the sliding block; one end of the universal joint is fixedly connected with the end part of the screw rod; and the handle is detachably connected to the other end of the universal joint. According to the technical scheme, by inclining the angle of the millimeter wave ceilometer, on one hand, the length of the rope between the unmanned aerial vehicle and the metal ball can be reduced, and because the unmanned aerial vehicle is located outside the beam irradiation range, interference sources are reduced, and the test precision is improved; meanwhile, the accuracy of position control of the metal ball is greatly improved, and the testing efficiency is improved.

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 utility model relates to the technical field of simple harmonic motion analysis under the action of a magnetic field, in particular to a simple harmonic motion analysis device and equipment based on a torsional pendulum under a magnetic field condition, and the device comprises a magnetic field torsional pendulum mechanism, a data acquisition mechanism and a control mechanism, the magnetic field torsional pendulum mechanism comprises a torsional pendulum assembly and a magnetic field generation module, and a metal ball in the torsional pendulum assembly is located in a magnetic field generated by the magnetic field generation module. The data acquisition mechanism comprises an encoder and a photoelectric door, and the encoder is mounted on a rotating shaft of the metal ball and is in contact with the metal ball; the photoelectric door is arranged on a motion path of the metal ball, and when the encoder synchronously rotates along with the metal ball, the edge of a coded disc of the encoder passes through a detection area of the photoelectric door; and the control mechanism is connected with the encoder and the photoelectric door. According to the utility model, automatic data acquisition and processing can be realized, and the motion state of the pendulum ball can be accurately monitored in real time.

To provide a micro-metal sphere manufacturing apparatus capable of stably producing micro-metal spheres with high precision and small variations in sphere diameter. [Solution] The micro-metal ball manufacturing apparatus 1 has a crucible 20 for containing molten metal M and a cooling tower 30 connected vertically to the crucible 20. An orifice 40 is provided at the bottom 24 of the crucible 20, connecting the crucible 20 and the cooling tower 30. The crucible 20 has a pressurized gas supply means 70 for supplying pressurized gas G1. The micro-metal ball manufacturing apparatus 1 has an excitation rod 54 that extends from outside the crucible 20 through the inside of the molten metal M to just before the orifice 40, and a vibrator 53 that is positioned outside the crucible 20 and vibrates the excitation rod 54 in the axial direction. The cooling air blowing means 70 blows cooling air around the entire circumference of the exposed part of the vibrator 53.

The microchannel liquid cooling plate comprises a plate body with an internal cavity, a plurality of regularly arranged blade teeth are arranged in the internal cavity of the plate body, and a plurality of metal balls are filled in gaps between the adjacent blade teeth. The metal balls and the blade teeth are connected in a metallurgical bonding mode and form a disordered micro-channel network in the gaps. The design is reasonable and ingenious, on the basis of form relieved tooth blade teeth, disorderly-arranged metal ball filler is introduced and combined with the form relieved tooth blade teeth, a high-specific-surface-area and strong-disturbance three-dimensional random micro-channel network is constructed, and therefore the heat exchange efficiency is remarkably improved, meanwhile, the process is kept relatively simple, and the cost is controllable.

The invention provides a spacecraft based on a spherical solar cell array as a shell, the spacecraft comprises a spacecraft spherical shell, the spacecraft spherical shell comprises a metal spherical shell and solar cells arranged on the metal spherical shell, and heat pipes with heat transfer capability are uniformly distributed and attached on the inner side surface of the metal spherical shell. A polyimide film is attached to the surface of the idle outer side, without the solar cell, of the heat absorption area of the spherical shell of the spacecraft. The invention further provides a thermal control design method of the spacecraft based on the spherical solar cell array as the shell. Compared with the prior art, the spacecraft with the spherical solar cell array as the shell and the thermal control design method of the spacecraft have the advantages that the spacecraft with the spherical solar cell array as the shell serves as the basis, temperature equalization is conducted on the spherical solar cell array of the spacecraft through the high-heat-conduction heat pipes, and therefore the spherical solar cell array keeps a small temperature gradient.

The invention discloses a wafer packaging structure and a wafer packaging method.The wafer packaging structure comprises a cap and a wafer which are oppositely arranged, a device structure is arranged on the wafer, a sealing ring is arranged between the cap and the wafer, and therefore a sealing cavity is defined by a metal layer and an organic material layer in the cap, the sealing ring and the wafer; the metal layer in the cap comprises a first metal region and a plurality of second metal regions which are insulated from each other, the second metal regions are electrically connected with the device structure through metal bumps, and metal balls electrically connected with an external power supply are arranged on the second metal regions; therefore, the device structure obtains the electric energy of an external power supply through the metal bumps, the second metal regions and the metal balls, breaks through the existing MEMS wafer level packaging mode, optimizes the process flow, shortens the process time, reduces the cost, and improves the production efficiency. In addition, the metal protruding block is located in the sealing cavity and can support the cap structure, so that the cap structure is firm and stable.

A spherical designer electromagnetic surface plasmon open resonator is provided. The open resonator includes a resonator inner core and a resonator outer shell. The resonator inner core is located in an inner center of the resonator outer shell, and the resonator inner core and the resonator outer shell are coaxial. The disclosure provides a device that implements the superscattering function for incident waves in all incident directions and in all polarization directions, and a spherical open resonator is implemented. The scattering cross section of the disclosure can be more than five times greater than that of a metal sphere of the same size, and the operating frequency can be flexibly designed. By utilizing the characteristic that the scattering cross section of the spherical designer electromagnetic surface plasmon resonator is much greater than its own geometric cross section, the electromagnetic super-scattering device can be implemented.

The invention relates to the field of preparation of metal spherical powder, in particular to a preparation method of niobium alloy spherical powder, and a spherical powder preparation process including coarse powder recycling is constructed by integrating plasma rotating electrode powder preparation and induction plasma spheroidizing processes. The fine powder accounts for more than 99% of 15-53 [mu] m and can be directly used for 3D printing, and the coarse powder is more than or equal to 53 [mu] m; and carrying out hydrogenation, ball milling, secondary screening, induction plasma spheroidizing and vacuum dehydrogenation on the coarse powder, and mixing the coarse powder with the fine powder to obtain the final niobium alloy spherical powder. According to the technology, efficient preparation of the high-quality niobium alloy spherical powder is achieved, the proportion of the finished product 15-53-micron fine powder is larger than or equal to 96%, the fine powder yield is larger than or equal to 85%, the oxygen content is smaller than or equal to 250 ppm, the spheroidization rate is larger than or equal to 95%, and the technology is suitable for powder bed laser melting additive manufacturing and suitable for the fields of aerospace, nuclear power, military industry and the like.

The utility model provides a floating disc liquid drainage structure with a ball. The floating disc liquid drainage structure comprises an upper fixing plate, a lower fixing plate, a side wall, a limiting component and a metal hollow ball, the upper fixing plate is provided with a flow guide pipe, the lower fixing plate is provided with a backflow pipe, and the flow guide pipe extends into the backflow pipe; a side wall is arranged between the upper fixing plate and the lower fixing plate and located on the outer side of the backflow pipe. The upper end of the backflow pipe is open, the lower end of the backflow pipe is closed, and an opening is formed in the area, between the backflow pipe and the side wall, of the lower fixing plate; the metal hollow ball is located at the top opening of the flow guide pipe in a floating mode, the movement range of the metal hollow ball is limited through a limiting part, and the limiting part is fixedly installed on the upper fixing plate. Through the design of the annular cavity structure, the floating disc liquid drainage structure with the ball has a better liquid accumulation prevention effect, and is simple in structure and convenient to mount and dismount.

The application discloses a phased array weather radar calibration method based on generalized metal ball calibration theory. The method comprises the following steps: collecting two-dimensional antenna pattern data of a phased array weather radar under at least one working mode and multiple different beam directions in a microwave darkroom; performing numerical integration on the two-dimensional antenna pattern data, calculating a combined beam main lobe real solid angle of a transmitting antenna and a receiving antenna, and calculating an equivalent beam width product; calculating a calibration theory reflectivity factor of a metal ball based on a radar scattering cross section of the metal ball and the equivalent beam width product; acquiring actual detection echo data of the phased array radar on the metal ball under different working modes and beam directions, and calculating an actual reflectivity factor; and comparing the actual reflectivity factor with the calibration theory reflectivity factor, thereby completing calibration of the phased array weather radar. The application can quantitatively evaluate the reflectivity factor of the phased array weather radar in a non-Gaussian working mode, and improves radar detection performance.

A spherical designer electromagnetic surface plasmon open resonator is provided. The open resonator includes a resonator inner core and a resonator outer shell. The resonator inner core is located in an inner center of the resonator outer shell, and the resonator inner core and the resonator outer shell are coaxial. The disclosure provides a device that implements the superscattering function for incident waves in all incident directions and in all polarization directions, and a spherical open resonator is implemented. The scattering cross section of the disclosure can be more than five times greater than that of a metal sphere of the same size, and the operating frequency can be flexibly designed. By utilizing the characteristic that the scattering cross section of the spherical designer electromagnetic surface plasmon resonator is much greater than its own geometric cross section, the electromagnetic super-scattering device can be implemented.

The utility model discloses a portable gas concentration detection equipment, include: self -priming gas detector, gas hose, metal ball, universal pipe and by the hard pipe of detachable connection of multiple section constitution's hard gas guide pipe, one end of gas hose with the one end of hard gas guide pipe can respectively with the air inlet interface of self -priming gas detector of can detachable connection, the other end of gas hose is connected with the connector on metal ball, the other end of hard gas guide pipe is detachable connection with universal pipe, the metal ball is hollow, and one end with connector has several air inlet holes on it. The application has the beneficial effects that: after the universal pipe is connected with the gas hose, the universal pipe can be bent in any direction, and after bending, it can be inserted into the inside of the high-altitude turning space, the inside of the turning space is detected, and the practicability is improved.

The utility model relates to the technical field of metal product drilling machining, and discloses an efficient full-automatic drilling mechanism applied to metal product machining, which comprises a material box used for containing metal balls, a feeding channel which is obliquely arranged is fixedly arranged at the edge of the top of the material box, and a feeding assembly is arranged between the material box and the feeding channel. The feeding assembly is used for conveying metal balls to the feeding channel at intervals, the discharging end of the feeding channel communicates with a partition piece, the partition piece is used for arranging and arranging the multiple metal balls one by one, a rotating platform is arranged on one side of the material box, the feeding assembly is arranged, and the metal balls can be sequentially conveyed to the feeding channel in batches; meanwhile, a partition piece is arranged at the discharging end of the feeding channel, it is ensured that each metal ball can accurately fall into the bearing table, stacking and interference among the metal balls are avoided, the machining stability and efficiency are improved, meanwhile, a punching device is further arranged, and an elastic limiting piece in the punching device is matched, so that the machining efficiency is improved. And the hole position accuracy and the machining quality are ensured.

The invention relates to the technical field of pneumatic conveying of powdery materials, and discloses a long-distance conveyor suitable for powdery raw materials, which comprises a conveying pipeline, the conveying pipeline is sequentially communicated with an air blower, at least one feeding bin and a collecting bin along the conveying direction, and each right-angle corner of the conveying pipeline is communicated with a protection mechanism. The protection mechanism comprises a right-angle bent pipe, a ball cavity cylinder and a backflow pipe. In the initial stage of conveying, the backflow pipe introduces part of airflow and trace materials of the discharging section into the ball cavity cylinder, the materials are promoted to gather towards the middle of the ball cavity cylinder, and a bridging structure is rapidly established at the positions of the metal balls in an auxiliary mode; along with continuous conveying, the powdery raw materials are gradually stacked at the bridging structure and completely fill the ball cavity cylinder, and a compact and stable material cushion layer is formed. The process does not depend on first abrasion of the bent pipe, but a protective layer can be actively formed at the initial stage of normal conveying, and follow-up high-speed powder is thoroughly isolated from the inner wall of the bent pipe.

The utility model relates to glass cover plate polishing and dust removing equipment which comprises a machine table, a box body is arranged at the top of the machine table, a movable seat is arranged in the box body, a vacuum adsorption mechanism is arranged at the top of the movable seat, a circle of arching part is arranged on the side wall of the box body in an outward protruding mode, and a circle of dust removing pipes are arranged in the arching part. Dust collection hoods are uniformly arranged on the dust removal pipe; a cover plate driven by a hydraulic rod is arranged at the top of the box body, a circular hole is formed in the middle of the cover plate, a circular plate is arranged in the circular hole, arc-shaped grooves are formed in the outer arc wall of the circular plate and the side wall of the circular hole in a surrounding mode, a plurality of metal balls are arranged in two sets of arc-shaped grooves, and the circular plate is sleeved with a gear ring. A gear meshed with the gear ring is arranged on the gear ring and driven by a motor I. A motor II is further arranged on the top of one side of the circular plate, and a circular polishing seat located on one side of the top of the movable seat is arranged on an output shaft of the motor II. The device is simple in structure and convenient to use.

The experimental equipment for chemical reduction of nitrate in seawater, which is claimed for protection in this application, includes a reaction bottle, a first feeding mechanism, a second feeding mechanism, and a sealing opening and closing mechanism. The sealing opening and closing mechanism includes an opening and closing drive and a metal sphere. The metal sphere is transmission-connected to the opening and closing drive, and the metal sphere can, under the drive of the opening and closing drive, push the flat-end tube body at least partially into the lower discharge pipe, and the metal sphere pushes the sealing portion on the sealing ring gasket to press against the telescopic sleeve, so that the telescopic sleeve, the flat-end tube body, the metal sphere, and the sealing ring gasket are enclosed to form a accommodating chamber; when the sealing ring gasket is respectively abutted and sealed with the metal sphere and the telescopic sleeve, the telescopic sleeve can provide a damping force to the flat-end tube body, so that the flat-end tube body and the metal sphere are abutted and limited, which is used to restrict zinc-cadmium particles from entering the accommodating chamber. This not only ensures multiple and reliable sealing of the reaction bottle, but also prevents leakage problems caused by the accumulation of zinc-cadmium particles.

The utility model relates to a mineral aggregate anti-blocking vibrating screen. The mineral aggregate anti-blocking vibrating screen comprises a screen box, a support is arranged at the bottom of the screen box, a screen hopper is arranged at the top of the screen box, vibrating motors are arranged on two extending parts of the screen hopper, the mineral aggregate anti-blocking vibrating screen further comprises a first screen mesh and a second screen mesh which are arranged in the screen hopper in parallel, and the second screen mesh is fixed to the bottom of the screen hopper. The first screen is adjustably mounted above the second screen through an adjusting bolt; wherein a plurality of rubber bouncy balls are placed on the second screen, and the diameter of each rubber bouncy ball is larger than the diameter of each screen hole of the first screen and the diameter of each screen hole of the second screen. The rubber bouncy balls are used for impacting the screen to prevent the screen from being blocked, metal balls are replaced with the rubber bouncy balls, damage of impact force to the screen is reduced, and therefore the replacement frequency of the screen is reduced.

The present invention discloses a method for preparing a hollow metal sphere, the method comprising: first, using non-spherical metal powders of two different powder particle sizes as raw materials, mixing and then pressing to obtain a cubic or cylindrical green body; second, using non-spherical metal powders of finer powder particle size to prepare a powder slurry, spraying it on the surface of the cubic or cylindrical green body to obtain a sprayed green body; third, sintering the sprayed green body at high temperature to obtain a sintered green body; fourth, placing the sintered green body in an electrostatic suspension device for high-temperature melting and heat preservation, and rapidly cooling to obtain a hollow metal sphere. The present invention achieves control of the porosity of the hollow metal sphere by selecting non-spherical metal powders of two different particle sizes as raw materials, and achieves near-net-shape forming without a container or crucible by using an electrostatic suspension method, thereby obtaining a hollow metal sphere with a solid outer wall and a dense shell. This fills the size gap of the hollow metal sphere from micro-nanoscale to several millimeters, and is suitable for energy absorption, damping and vibration reduction, explosion-proof flame retardancy, heat insulation and other fields.

The invention relates to the field of connecting rod machining and manufacturing, and provides connecting rod machining and manufacturing equipment which comprises two supporting plates, a top plate is fixedly connected to the top sides of the two supporting plates, two sliding grooves are formed in the bottom side of the top plate, sliding rods are slidably connected into the sliding grooves, and the two sliding rods are connected through a telescopic arm. The middle end of the top side of the telescopic arm is rotationally connected to the bottom side of the top plate through a rotating rod, the bottom end of a sliding rod is fixedly connected with a sliding block, fixing plates are fixedly connected to the four corners of the bottom side of the top plate, and a reciprocating lead screw is rotationally connected between the two fixing plates on the front side; the top sides of the two supports are provided with blanks, the top side of the telescopic arm is connected with two drilling machines used for drilling the blanks through a lifting assembly, and the drilling machines are located on the top sides of the blanks. And by means of the telescopic arm, the joint ball and the metal spherical shell, the equipment can polish the two sides of the blank at the same time, trepanning operation is conducted on the blank during polishing, and the machining efficiency of the equipment is improved.