32results about How to "High structural symmetry" patented technology

A chip integrated waveguide feeding print antenna is composed by a chip with its two metal sides being transfixed with metal through holes in array. The two metal sides are in axial symmetry. There is an intergrading section to one side of the waveguide centerline on two surface of the chip linking with transmission line. To the outer end of the intergrading section links a vibrator antenna. To the opposite side of the intergrading section on the waveguide links a micro-strip intergrading commutator linking with micro-strip transmission line.

The invention discloses a high-heat-stability locking joint. The high-heat-stability locking joint comprises a first connecting piece 1, a second connecting piece 2, fixed-pressure locking devices 3,a rotating shaft module 4 and low-impact release devices 5; the first connecting piece 1 and the second connecting piece 2 are fixedly connected with rod pieces, and form a rotating pair through a rotating shaft 42 and a bearing 43; the hinging between the first connecting piece 1 and the second connecting piece 2 is realized; and the fixed-pressure locking devices 3 with constant pressing force are arranged at two ends of the rotating shaft 42, and can realize locking through the low-impact release devices 5. Through reasonable layout of the fixed-pressure locking devices 3, the rotating shaft module 4 and the low-impact release devices 5, the whole joint is symmetrical relative to two planes passing through the axles of the rod pieces, so that the problem of weak symmetry of a traditional locking joint is overcome; through deformation of flexible supports 36, the axial gapless locking is realized, the locking gap of the traditional locking joint is eliminated, and the locking rigidity is improved; and through arrangement of the fixed-pressure locking devices 3 and the low-impact release devices 5, the same pretightening force at two ends of the rotating shaft 42 is guaranteed, and the problem of weak heat stability of the traditional locking joint is solved.

The invention relates to a halogen-free thermosetting resin composition, a prepreg prepared from the halogen-free thermosetting resin composition and a laminated plate for a printed circuit. The halogen-free thermosetting resin composition comprises, by weight, 30-60 parts of halogen-free epoxy resin, 5-30 parts of phosphorus-containing bisphenol as a first curing agent, 5-30 parts of dicyclopentadiene-type phenolic aldehyde as a second curing agent and a phosphorus-containing fire retardant. The prepreg prepared from the halogen-free thermosetting resin composition and the laminated plate for a printed circuit have high glass-transition temperatures, excellent dielectric properties, low water absorption rates, high heat resistance and good processability, realizes halogen-free flame retardation and has a UL94V-0 level.

The invention discloses a wideband rotating magnetic characteristic measuring system and method based on a flexible excitation coil. The measuring system comprises a detection device, a digital signal processing unit, a power amplifier, and a differential amplification circuit. The digital signal processing unit is connected with the power amplifier and the differential amplification circuit. The detection device is connected with the power amplifier and the differential amplification circuit. The detection device comprises a three-stage frustum-shaped excitation winding, a sample holder, a horizontal structure magnetic ring, a center pillar, a buckle, a corner pillar and a base. The excitation winding of the measuring system is designed as a multi-stage frustum-shaped structure to realize a wideband magnetic characteristic test. The measuring method comprises first giving an excitation signal with a low frequency, gradually increasing the frequency of the excitation signal until the sample is saturated; replacing the excitation winding connection mode after the sample is completely measured in the excitation winding connection method, and repeating the measurement process until the highest detection band.

The invention relates to an eddy current loss measuring system and method of a permanent magnet. The system comprises a detector, a power amplifier, a differential amplification circuit and a digitalsignal processing unit; the detector comprises two U-shaped magnetic cores facing each other, excitation windings wound around magnetic poles of the U-shaped magnetic cores respectively, a magnetic core fixing support for fixing the magnetic cores, a position fixed support, a bottom support platform and a sample fixing support; the upper portion of the magnetic core fixing support is provided withgrooves which match the shapes of the magnetic cores, and the magnetic cores can be just fixed in the grooves respectively after winding of the excitation windings; the lower portion of the magneticcore fixing support is provided with a sliding groove; the sampling fixing support is fixed on the bottom support platform between the two U-shaped magnetic cores; and the excitation windings are connected in series and then connected to the digital signal processing unit via the power amplifier. Thus, the practical operation condition of the magnetic field of the motor can be simulated, the totalloss condition of the permanent magnet is reflected accurately, and the method is highly repeatable.

The invention relates to a halogen-free thermosetting resin composition, a prepreg using the composition, and a laminated plate for a printed circuit. The halogen-free thermosetting resin composition is characterized in that 100 parts by weight of organic solids comprise, by weight, 16-42 parts of halogen-free epoxy resin, 1.5-4.8 parts of a compound containing a hydrobenzooxazine ring, 10-28 parts of a phosphorus-containing bisphenol curing agent with the weight average molecular weight of 1000-6500, and 30-70 parts of silica. The prepreg made of the halogen-free thermosetting resin composition and the laminated plate for the printed circuit have the advantages of high glass transition temperature, excellent dielectric properties, low water absorption rate, high heat resistance, good technologic processability, realization of no halogen and flame retardation, and reaching of UL94 V-0.

The invention discloses an anti-displacement cold stamping drawing mold, and aims to provide a drawing mold capable of effectively and quickly positioning a drawing plate, effectively protecting the plate and guaranteeing the finished product quality. The anti-displacement cold stamping drawing mold comprises a concave mold positioned on the upper side, and a convex mold positioned on the lower side; the concave mold includes a molding table; a plate cavity is formed in the convex mold; multiple pre-limiting parts are arranged on the concave mold; the pre-limiting parts include pre-limiting cylinders and positioning frames; the positioning frames are provided with pressing bars rotationally connected with the positioning frames through middle parts; transverse slide holes are formed in the pressing bars; rotating shafts are arranged in the transverse slide holes; piston rods of the pre-limiting cylinders are rotationally connected with the rotating shafts; and a pre-limiting anti-interference cavity is formed in the concave mold. The anti-displacement cold stamping drawing mold has the following beneficial effects: the anti-displacement cold stamping drawing mold can provide effective clamping and fixation to guarantee smooth actuation of previous drawing process, has an automatic ejecting structure for automatically realizing ejection after mold separation, and can continuously fix the plate after failure of a pre-positioning structure to realize automatic deviation when the mold is to be closed, so that the smoothness of mold closing process is maintained.

The invention discloses a hemispherical resonator mass balance processing device and a working method. The mass balance processing device includes a shaft sleeve and a vessel, and one end of the shaft sleeve is used to connect with the handle end of the hemispherical resonator to be balanced. The other end of the bushing is connected to a rotating shaft, and the other end of the rotating shaft connected to the bushing is connected to the rotating shaft of the rotating motor. The handle end of the hemispherical resonator to be balanced, the bushing, and the The axes of the rotating shaft and the rotating shaft of the rotating motor are all located on the same extension line, and a lifting structure that can drive the entire mass balance processing device to rise or fall is also provided on the rotating shaft. Chemical etchant for etching the hemispherical resonator to be balanced. The solution can correct the geometric deviation of the hemispherical resonator, thereby reducing the inhomogeneity of its mass distribution.

The present invention relates to a halogen-free thermosetting resin composition, a prepreg using it, and a laminate for printed circuits. The halogen-free thermosetting resin composition, based on 100 parts by weight of organic solids, comprises: (A) 16-42 parts by weight of halogen-free epoxy resin; (B) 1.5-4.8 parts by weight of compound with dihydrobenzoxazine ring; (C) 10-28 parts by weight of phosphorus-containing bisphenol curing agent, said phosphorus-containing bisphenol The weight-average molecular weight of phenol is 1000-6500; (D) 30-70 parts by weight of silicon dioxide. The prepreg and printed circuit laminate made of the halogen-free thermosetting resin composition provided by the invention have high glass transition temperature, excellent dielectric properties, low water absorption, high heat resistance and good processability , and can achieve halogen-free flame retardancy, reaching UL94 V‑0.