42results about How to "Uniform and symmetrical distribution" patented technology

The invention relates to the technical field of electronic products, and provides a loudspeaker and a headset. A horn bracket, a magnetic circuit system and a vibration system are comprised. The horn bracket is used for providing a through hole used for accommodating the magnetic circuit system. The magnetic circuit system comprises an inner magnetic ring and outer magnetic ring which sleeves the inner magnetic ring. The inner magnetic ring and the outer magnetic ring share the same axis. A gap is between the inner ring surface of the outer magnetic ring and the outer ring surface of the inner magnetic ring. The magnetic poles of the inner magnetic ring and the outer magnetic ring are different. Magnetic force lines formed by the inner magnetic ring and the outer magnetic ring in the gap are radially arranged. The vibration system comprises a sound film, a voice coil with one end connected with the sound film, and a coil which is connected with the other end of the voice coil. The coil is placed in the gap. The sound film is connected with one end part of the horn bracket. According to the design of the magnetic circuit system, magnetic flux leakage and hysteresis loss are reduced; the magnetic force lines are uniformly and symmetrically distributed; distortion is reduced; and true sound is restored to show the sense of reality.

An RF diathermy coil assembly, including a generally elastically deformable patient conforming garment and a conductive coil secured to the garment. The conductive coil having a woven wire construction such that the coil can deform as the garment elastically deforms. The RF diathermy coil assembly can be used for wound healing in conjunction with muscle stimulation.

The invention discloses buried type movable garbage disposal equipment based on worm gear and lead screw transmission in the technical field of garbage disposal equipment. The buried type movable garbage disposal equipment based on worm gear and lead screw transmission comprises a main framework, a lifting platform and a jacking transmission mechanism, wherein the lifting platform is further provided with a vertical lifting guide mechanism; the jacking transmission mechanism comprises lead screws, nuts and a bottom supporting base; the nuts are fixedly installed on the lifting platform; the axial length direction of the lead screws is consistent with the lifting direction of the lifting platform; the head portions of the lead screws are rotationally installed on the main framework; the foot portions of the lead screws are rotationally installed on the bottom supporting base; at least four sets of the lead screws and the nuts, and the number of sets is an even number; the lead screws and the nuts are symmetrically arranged; the foot portions of the lead screws are fixedly sleeved with worm gears; a rotation acting mechanism capable of driving the lead screws to rotate is arranged on a ground foundation below the lifting platform and comprises a worm meshed with the worm gears and a drive system capable of driving the worm to rotate. The synchronism of the lifting action of the lifting platform can be accurately controlled, and the structure is simple and reasonable.

The invention provides a chip taking and placing device which can be used for technologies including a preparation technology of light-emitting diodes and the like which require chip movement. The chip taking and placing device comprises a chip storage area, a chip placing area, a rotating shaft, a first sucking nozzle and a second sucking nozzle, wherein the first sucking nozzle and the second sucking nozzle are arranged on the rotating shaft, and the rotating shaft rotates to drive the first sucking nozzle and the second sucking nozzle to place chips from the chip storage area to the chip placing area. The chip taking and placing device is characterized in that the first sucking nozzle and the second sucking nozzle are in even symmetry around the axis of the rotating shaft and on the same plane perpendicular to the axis of the rotating shaft and are distributed corresponding to the chip storage area and the chip placing area. The chip taking and placing device can perform sucking-taking and placing simultaneously, thereby effectively improving the overall production efficiency.

The invention discloses an internal rotation feeding device for large thin-wall cylindrical part pair wheel spinning equipment, relates to an internal rotation feeding device, and aims to solve the problems of high mold cost, weak generality and long manufacturing period in traditional mold spinning equipment. A conical wedge block coats a feeding lead screw; multiple internal rotation wheel bases are annularly and uniformly mounted on the conical wedge block; one rotating shaft is vertically and rotationally mounted in each internal rotation wheel base; one internal rotation wheel is mounted on each rotating shaft; cross chutes are respectively formed in a rotating base guide sleeve and a wedge block guide sleeve, and are mutually aligned and buckled up and down; a transition sleeve coats the feeding lead screw, and is positioned at the upper end of the wedge block guide sleeve; an upper cross beam is mounted on the transition sleeve; an internal rotation motor is mounted on a speed reducer for transferring power to a speed reducer; and the speed reducer drives the feeding lead screw to rotate. The internal rotation feeding device is suitable for the thin-wall cylindrical part pair wheel spinning equipment.

The invention provides a large-size and high-quality factor carbon-doped titanium gem laser crystal. The crystal comprises an Al2O3 host material, wherein the doping content of carbon in the carbon-doped titanium gem laser crystal is 0.05-1 wt% of total mass; and the doping content of titanium in the carbon-doped titanium gem laser crystal is 0.1-0.5 at%. The invention further discloses a preparation method for the crystal. The method comprises the following steps: raw materials are mixed, grinded, formed and sintered by proportioning to prepare crystal growth block materials; and then the kyropoulos method technology is adopted to grow. The carbon-doped titanium gem laser crystal has high quality factor (FOM (Figure of Merit) value). The titanium gem laser crystal with large size, high optical quality and high quality factor can efficiently grow; the FOM value is higher than 300; and the method can be used for producing ultrafast high-energy lasers.

The invention discloses a manufacturing method of a small-size sintered NdFeB multi-pole magnetic ring, and belongs to the technical field of permanent magnet material preparation. According to the method, a pneumatic pressing device is adopted for pressing and forming sintered neodymium-iron-boron powder, then a pressed blank is taken out and subjected to isostatic pressing treatment, high-temperature sintering, tempering treatment and trepanning and grinding treatment, and the sintered NdFeB multi-pole magnetic ring is obtained. The pneumatic pressing device comprises an orientation mechanism and a pressing die, the orientation mechanism is composed of an even number of sintered NdFeB magnetic shoes which are evenly distributed in the circumferential direction at intervals, a die installation cavity is formed among the sintered NdFeB magnetic shoes in a surrounding mode, and the pressing die is correspondingly installed in the die installation cavity. By the adoption of the technicalscheme, the small-size sintered NdFeB multi-pole magnetic ring can be effectively manufactured, the manufacturing process is convenient, the equipment investment cost is low, the manufactured multi-pole magnetic ring is good in magnetic performance, and meanwhile the pressing percent of pass and the overall efficiency of the multi-pole magnetic ring are improved.

The invention relates to a device for generating gas bubbles in a liquid in a container, including at least one rotatable hollow shaft arranged horizontally in at least one container; at least one gassing disc arranged vertically on the at least one hollow shaft; and at least one feed line for supplying at least one compressed gas to the interior of the at least one hollow shaft, said compressed gas being brought into the feed line and hollow shaft directly, without a liquid carrier.

The invention discloses an oil injection system suitable for a high-power-density diesel engine, and belongs to the related technical field of diesel engines. The oil injection system comprises a main oil injector vertically arranged in the center of a cylinder cover and an auxiliary oil injector obliquely arranged on the cylinder cover. The main oil injector and the auxiliary oil injector are provided with a plurality of oil injection holes. The auxiliary oil injector is provided with a plurality of oil injection holes. One oil injection hole of the main oil injector and one oil injection hole of the auxiliary oil injector are oppositely arranged. The multiple oil injection holes of the main oil injector are symmetrically distributed in the circumferential direction of the main oil injector through the center axis of the oil injection hole opposite to the auxiliary oil injector, and the angles between the adjacent oil injection holes are gradually increased in the direction away from the auxiliary oil injector. According to the oil injection system, the oil injection holes of the main oil injector are distributed sparsely in the side provided with the auxiliary oil injector, the oil injection holes of the main oil injector are distributed densely in the side away from the auxiliary oil injector, the problem that overall fuel oil distribution is uneven and asymmetric due to existence of the auxiliary oil injector can be balanced and compensated, and fuel oil in a diesel engine cylinder is evenly and symmetrically distributed integrally.

The invention relates to a slotless permanent-magnet machine comprising stator components. The invention is characterized in that: said stator components comprise a false stator (5); an iron core (6) and a stator winding (7). Wherein, said false stator (5) is sheathed outside the iron core (6); said stator winding (7) is arranged of wire outside the false stator (5); and said false stator (5) is made from insulation material. The invention replaces the groove and tooth on the punching sheet of stator iron core with insulated false stator (5) to effectively solve the problem of slot electric machine as slot effect, hysteresis loss, eddy current loss and eddy current loss. The invention has higher load efficiency, continuous speed regulation, better acceleration property, higher overload capacity, smaller volume, stable operation, small torque fluctuation and simple manufacture process.

The invention relates to a chromatographic column temperature control device and control method of a chromatographic instrument, and belongs to the technical field of chromatographic column temperature control of the chromatographic instrument. The aim is to provide improvement of a hardware structure of the chromatographic column temperature control device of the chromatographic instrument and the chromatographic column temperature control method of the chromatographic instrument. According to the technical scheme, the control device comprises a column box body, the column box body is a peripherally sealed box body, and a column box heat preservation layer is arranged on the inner side of the column box body; the column box body is internally provided with a first temperature measuring resistance sensor, a chromatographic column, a heating device, a second temperature measuring resistance sensor, a heat dissipation motor, a blower motor and an electric appliance control box, the bottom of the column box body is provided with a heat dissipation hole, and the heat dissipation hole is also provided with a hollow heat dissipation sheet; and the chromatographic column is arranged in the middle of the column box body through a support, the upper side of the chromatographic column is separately provided with the first temperature measuring resistance sensor, and the lower side of thechromatographic column is provided with the heating device. The control device and the control method are applied to the chromatographic instrument.

The invention relates to the technical field of steering knuckles, and in particular relates to a method for improving the elongation and the shrinkage of a rod part of a steering knuckle. The methodcomprises the steps of heating round steel, upsetting, extruding, pre-forging and finish-forging to obtain a forging blank, and during pre-forging, arranging a transition arc at the joint of the rod part and a disc part of the steering knuckle, and the transition arc forming an annular face around the axis of the rod part. The radius of the transition arc on the side, close to a steering knuckle long lug, of the annular face is R1, R1 is a fixed value, the radius of the transition arc on the side, close to a steering knuckle short lug, of the annular face is R2, the plane where the axis of therod part of the steering knuckle and the axis of a main pin hole are located serves as a datum plane, and R2 is evenly reduced to R1 along with the angle deviating from the datum plane. According tothe method, rod part mold filling can be facilitated, shear damage of an internal metal flow line in the forming process of the rod part of the steering knuckle is reduced, and reduction of the mechanical performance of the rod part is avoided; the rod part can be uniformly distributed, and two sides of the flow line are uniformly and symmetrically distributed; and the stress distribution at the joint of the rod part and the disc part of the steering knuckle is improved.

The invention provides a rear-mounted direct-current photocathode ultrafast electronic gun with an immersed electrostatic lens. The rear-mounted direct-current photocathode ultrafast electronic gun comprises a cathode, an anode and an electrostatic lens electrode determined by an electric field and a particle simulation program, and a ceramic disc, a fine ceramic column, an electrostatic lens electrode ceramic support and an electron gun support which are suitable for rear mounting. and the cathode comprises a hollow cylinder, a circular top surface and an arc-shaped connecting surface. The anode comprises two smooth discs and a cylindrical protrusion on the back side, and a through hole is formed in the center of the anode. The electrostatic lens electrode comprises a circular top surface, a cylindrical side surface and an arc-shaped connecting surface, and a through hole is formed in the center. A cylindrical protrusion is arranged in the center of the circular top face, and the topannular face of the protrusion is chamfered. The electronic gun support is of a double-disc connecting structure, a top disc is connected with the fine ceramic column and the ceramic disc, the cathodeis fixed to the ceramic disc, and the anode is placed in a groove in the top disc. The electrostatic lens electrode is fixed on the ceramic support, and the ceramic support is fixed on a disc at thebottom of the support.

The invention relates to the technical field of petrochemical industry production devices, in particular to a multi-zone reactor with a cyclone separator. The multi-zone reactor comprises a main cylinder and an auxiliary cylinder which are vertically arranged, and an annular shell is arranged between the top of the main cylinder and the top of the auxiliary cylinder. The cyclone separator comprises a pre-cyclone device arranged at the position, close to the main cylinder, of the annular shell and a cyclone guide device arranged at the inner top of the main cylinder, the cyclone guide device comprises an end socket located at the top of the main cylinder, a jacket and a plurality of flow guide partition plates, an annular flow channel is formed between the jacket and the inner wall of the end socket, and the flow guide partition plates are distributed in the annular flow channel in the circumferential direction; and the flow guide partition plate is in a spiral flow guide shape longitudinally. A pre-swirler can enable the flowing fluid to generate a rotating flow state around the bending central axis of the large annular shell, and the flow deviation state caused by centrifugal force when the flowing fluid flows through the annular shell is broken. And the flow guide device at the top of the main cylinder body can enable the fluid entering from the pre-swirler to generate a rotating flow state which is uniformly distributed in the circumferential direction around the central vertical axis of the main cylinder body, so that the effect of further strengthening the rotational flow is achieved.

The invention relates to the technical field of loudspeakers, in particular to a double-station-diameter square loudspeaker T-yoke. T-yoke comprising a T-yoke body, a mandrel is arranged at the top ofthe T-yoke body; a cylindrical cavity is formed in the center of the mandrel; the mandrel is further provided with a plurality of positioning grooves. A copper pipe is arranged in cylindrical cavity,outer ridges are arranged on the outer wall of the copper pipe; the outer ridges are embedded into the positioning grooves; inner ridges are arranged on the inner wall of the copper pipe; a lower clamping plate is arranged at the bottom of the T-yoke body, a heat dissipation hole is formed in the center of the lower clamping plate, the lower clamping plate is integrally formed by a circular plateand a square plate, a first limiting ring is arranged on the upper surface of the circular plate, magnetic steel sleeves the periphery of the first limiting ring, an upper clamping plate is arrangedat the top of the magnetic steel, and a cushion block is arranged on the lower surface of the square plate. The copper pipe with the inner and outer double-ridge structure is arranged, the heat dissipation area of the mandrel and the outside is increased, the magnetic steel and the upper clamping plate are positioned through the first limiting ring and the second limiting ring, and it is guaranteed that magnetic gaps between the upper clamping plate and the mandrel are uniform and symmetrical.

The invention discloses a method of improving Al-Cu spot welding quality. The method comprises the following steps: one, Mn powder and Zn powder are weighed according to a mass ratio of (6-10):(1-3); two, the Mn powder and the Zn powder are proportionally mixed uniformly, a volatile solvent is added, and an alloy powder paste is formed through blending; three, the alloy powder paste is stirred, after the viscosity of the alloy powder paste is 0.5-0.55Pa.s, overlap joints of a Al material and a Cu material which are to be welded are subjected to knife coating with the alloy powder paste, and alloy powder paste layers are formed at the Al material and the Cu material; and four, the overlap joints of the Al material and the Cu material are subjected to spot welding. The method has the significant effects that the cast nugget size of dissimilar metal Al-Cu is increased, cast nuggets are distributed uniformly and symmetrically between Al and Cu, the shearing resistance of the dissimilar metal Al-Cu is improved significantly, and thus the spot welding quality of the dissimilar metal Al-Cu is improved.