41 results about "Line strength" patented technology

The invention discloses a multi-component real-time online remote monitoring device and a method for coal spontaneous combustion indicator gas. For the limit of long distance optical fiber sensing band, the near-infrared band with weaker gas absorption line strength is used for real-time online monitoring the typical alkane gas as CO, CO2, C2H2 and C2H4 in the indicator gas. The multi-component weak signal is detected through the multi-frequency wavelength modulation and novel long optical distance multiple reflection pool technology; the device comprises a laser, a laser controller, a signal generator, a novel multiple reflection pool, an optical fiber collimator, a light beam coupler, a photoelectric detector, a lock-in amplifier, a processing system collecting the signal of A / D and terminal and an anti-explosion case. The device adopts the optical fiber for connection without manpower sampling, the responding sensitivity is high, the device and the method can monitor a variety of indicator gases at the same time with simple operation, good stability and small power, the device is easy to carry and install for field experimentation and the dynamic measuring range is large.

The invention relates to the technical field of welding, and discloses a procession welding method for a superfine stainless steel mesh. In order to solve the problem of incapability of rapid welding in the prior art, the invention provides the following technical scheme: the method is characterized by comprising the steps: a, preparation work; b, mesh alignment and compression; c, one-time successive welding from one end of a joint to the other end thereof by utilizing a microbeam plasma arc welding machine, wherein, the diameter of a tungsten rod is 0.8-1.2 mm, the aperture of a nozzle is 0.8-1.2 mm, the neck-in amount of the tungsten rod is 1.8-2.2 mm, the height of a welding torch is 2.8-3.2 mm, the current of DC welding is 1.9-2.1 A, the welding speed is 10.0-13 mm / s, the shielding gas flow is 3.0-4.0 L / min, and the ionic gas flow is 0.25-0.35 L / min. The invention has the beneficial effects of realizing automatic rapid welding and high welding line strength; in addition, normal screenability is maintained.

The invention discloses a highway tunnel health status dynamic evaluation method based on the variable fuzzy set theory. The method comprises the steps of constructing a highway tunnel health status evaluation index system with lining fissures, lining strength, lining thickness, corrosion of reinforcement, lining deformation, back cavities, pavement distress, harmful gas and lighting distress as evaluation indexes as well as the qualitative and quantitative criterion of the evaluation grade and each evaluation index of highway health status; and through repeated and regular detection of the highway tunnel evaluation indexes by a tunnel diagnosis and fast repairing integrated car and based on the variable fuzzy set theory, determining highway tunnel detection node health status values and the health status deteriorating speed mean value and establishing a highway tunnel health status dynamic evaluation model by means of repeated detection data of the highway tunnel health status evaluation indexes and the criterion of the evaluation grade and each evaluation index of the highway health status. The highway tunnel health status dynamic evaluation method based on the variable fuzzy set theory not only achieves objective evaluation of the highway tunnel health status, but also can be used for dynamic prediction of the highway tunnel health status.

The invention provides a gas temperature probability density distribution fitting reconstruction method based on single light path and multispectrum, comprising the following steps of: making a lightpath pass through the gas to be measured along a single optical path by multiple absorption spectrum information corresponding to the gas molecules to obtain a absorption rate integral measurement data; constructing an integral equation system according to the line strength and the corresponding absorption rate integral measurement data and performing normalization processing; performing a two-dimensional surface fitting of temperature and line center frequency on the line strength, and performing a polynomial fitting respectively on the measurement data and the probability density distribution to be solved to decompose the integral equation system into a matrix equation; solving the matrix equation to obtain fitting parameters, and then solving the gas temperature probability density distribution. Compared to a multi-view multispectral imaging system, the present invention has the advantage that no multiple optical windows are needed, the gas temperature probability density distribution can be reconstructed using only multiple absorption spectra, and the method has fast reconstruction speed, excellent effect, simple structure, good reliability, and widely used application prospect.

The invention discloses a remote LIBS (Laser-induced Breakdown Spectroscopy) element quantitative analysis method based on weighted multispectral calibration. The method comprises the following steps: firstly, achieving remote target LIBS spectral acquisition of a test site, and in the process, qualitatively obtaining major element compositions of the remote target to be tested, as well as the line strengths of multiple spectral lines of elements to be tested; then, finishing laboratory sample calibration and obtaining the relation fitted equation between the strengths and the percentage contents of the multiple lines of the elements to be tested; finally, quantitatively calculating the percentage contents of the elements to the tested according to the multispectral weighting method. The method can solve the remote LIBS element quantitative analysis problems better.

The invention relates to large-scale chemical equipment and a manufacture technology of a lining anti-corrosion board of the large-scale chemical equipment. The manufacture technology comprises the following steps of: (1) carrying out sand-blast cleaning on an inner wall; (2) carrying out roll painting; (3) setting out a flitch, gluing a pressed vacuum rope at the inner wall of the equipment in the process of vacuumizing, and gluing a board; (4) welding; (5) detecting; and (6) reinforcing and shaping by steam. The equipment comprises a tank body, wherein the outer surface of the tank body is provided with a plurality of vacuum mouths, the inner wall of the tank body is provided with the anti-corrosion board connected with by binder, the vacuum rope is arranged between the board and the inner wall of the tank body, and wrinkles which run along with the vacuum rope are formed on the surface of the board. According to the invention, the vacuum rope is glued at the inner wall of the equipment, so that the vacuum gluing strength can be preferably enhanced, and the expansion or the contraction of the board lining can be carried out along with the wrinkles formed on the surface; the technical difficulty that the lining anti-corrosion material of the large-scale chemical equipment is easy to fall off can be solved, and the technology is more energy-saving, environments-friendly, low in energy consumption, and low in cost; and various anti-corrosion equipment machined and manufactured by the technology is high in lining strength, corrosion resistant, and long in service life.

The invention relates to a laser welding method. The method comprises the steps that laser emitted by a single mode fiber laser device is subjected to shaping, a laser beam is obtained, and the laserbeam forms light spots with the diameter being 0.03 mm to 0.05 mm on the workpiece; the workpiece moves in the first direction, the light spots swing in the to-be-welded area of the workpiece in the second direction, the first direction and the second direction are perpendicular, and the amplitude of the light spots ranges from 0.08 mm to 0.3 mm. The laser welding method can obtain a welding linewith the section shape being a rectangle or trapezoid, and the welding line strength is higher.

The invention discloses a vacuum photoelectric direct-reading spectrometer which comprises a vacuum photoelectric direct-reading spectrometer body, wherein the vacuum photoelectric direct-reading spectrometer body comprises an excitation spark light source for controlling an electrode excitation sample to emit a characteristic spectrum, a Hg lamp capable of generating a base body line, and a photomultiplier for converting a spectrum line strength into a current signal and amplifying a current. The vacuum photoelectric direct-reading spectrometer is characterized by further comprising a singlechip, a keyboard, a timer, a display and a power line switch, wherein the keyboard, the timer, the display and the power line switch are respectively connected with the singlechip, and the power line switch is connected with the excitation spark light source, the Hg lamp and the photomultiplier respectively. According to the vacuum photoelectric direct-reading spectrometer, the working time of the vacuum photoelectric direct-reading spectrometer can be set as required, and the situations that the service life is reduced and energy source is wasted due to long-term working are prevented. Furthermore, a housing of the photomultiplier is prevented from being overlong, so that the vacuum photoelectric direct-reading spectrometer is unlikely to be damaged.

The invention provides a method for achieving nonuniform combustion field gas parameter quantitative measurement based on the modulated spectrum technology. The method comprises a wavelength modulated spectrum measurement step, a wavelength modulated spectrum fitting step and a step of calculating gas parameters in a nonuniform flow field. According to the specific content of the method, an absorption spectral line with the line strength linearly changing along with temperature within the measured temperature range is selected; transmission light intensity signals are measured through tests, and harmonic signals measured through the tests are obtained; the integral optical density, Gaussion line width and Lorentz line width are adopted as free variables, and the harmonic signals of the spectral line are fit based on the least square method; the gas parameters in the nonuniform combustion field are calculated.

The invention discloses a method for measuring the tungsten content in ferromolybdenum through an inductively coupled plasma atomic emission spectrometry. The method comprises the following steps: dissolving a to-be-measured ferromolybdenum sample to prepare a to-be-measured solution; dissolving molybdenum and high-purity iron, and adding tungsten standard solutions of different volume to a system separately to prepare standard series of solutions; introducing the standard series of solutions into an inductively coupled plasma atomic emission spectrometer, measuring the analytical line strength of a tungsten element in the standard series of solutions from low concentration to high concentration, drawing a working curve by employing the mass fraction of the tungsten element as a horizontal ordinate and the analytical line strength as a vertical coordinate to obtain a linear equation; introducing the to-be-measured solution into the inductively coupled plasma atomic emission spectrometer and measuring the analytical line strength of the tungsten element in the to-be-measured solution; and calculating the mass fraction of the tungsten element in the to-be-measured solution according to the linear equation. The method has the characteristics of a low detection limit, small matrix interference, a wide linear range and high sensitivity and accuracy, and the detection limit can reach 0.0014%.

The invention discloses a tunnel lining thickness insufficiency fast reinforcement method based on a clad steel plate or a steel strip highway. The method comprises the following steps that a, an areawith insufficient second lining is detected; b, the lining surface in the second lining range is polished; c, distribution of to-be-processed steel bars in the second lining range is clearly detected, and fixing anchor bars are arranged in the second lining range at intervals; d, the steel plate is arranged at the fixing anchor rods in a penetrating mode, a grouting gap is reserved between the attaching surfaces of the steel plate and the second lining, the steel plate is sealed by structure glue, after sealed edges solidify and harden, and steel adhesive glue is arranged through a glue filling opening in a filling mode; and e, after steel plate construction is finished, the steel plate is sealed with epoxy resin adhesive, and the steel plates are uniform coated with a reflective layer every 200 meters. The method can quickly deal with the defect of the insufficient thickness of the second lining concrete of the local tunnel lining and can achieve a certain of reinforcement effect. Through steel strip bonding, grooving is not required, influence on building limit is little, forming is quick, and lining strength is improved.

The invention discloses a hydraulic support oil cylinder stainless steel connector base welding method. MAG welding is adopted, 80% Ar+20% CO2 mixed gas serves as the protective gas, and a low-alloy high-strength steel welding stick is selected; a to-be-welded stainless steel connector base is preheated to 250-300 DEG C, the welding current is controlled to be 210+ / -10 A, the welding voltage is controlled to be 23+ / -1V, the welding speed is controlled to be 400-500 mm / min, and bottoming welding is conducted; the temperature between weld beads is kept to range from 250 DEG C to 400 DEG C, the welding current is controlled to be 240+ / -10 A, the welding voltage is controlled to be 25+ / -1V, the welding speed is controlled to be 500-700 mm / min, and filling welding is conducted. MAG welding is adopted, the welding manner is the same with the welding manner of other components of a hydraulic support, the welding process requirement is relatively simple, welding equipment and protective gas donot need to be replaced, and welding production organization is convenient. The low-alloy high-strength steel welding stick is adopted as a welding material for welding, the strength and tenacity ofa welding connector can be improved, and the welding material cost is reduced. Many frequently-happening welding problems that in the stainless steel connector base welding process, many welding defects exist, the welding line strength is low, and heat affected zone hardness is high are solved.

The invention provides a welding line strength control method for magnesium alloy multilayer and multichannel laser overlaying. The method comprises the following steps: (1) the X-ray radiographic inspection is performed on castings to be welded to obtain flaw detecting data; (2) according to the obtained flaw detecting data, the types and the distribution positions of defects in the castings areanalyzed; and the defects in the castings are removed through machining to obtain defect-removed castings; and (3) for the obtained defect-removed castings, a laser self-melting welding method capableof precisely controlling the laser power is adopted to enable laser beams to fuse the bottoms and the side walls of substrates with depths of d1; and through flowing of a welding molten pool, gas onthe surface layers of die-cast substrates is released. The method can realize the welding line strength control in multilayer and multichannel laser overlaying of complicated die-cast structural partsof vehicles and aircrafts, and is high in bonding strength of the welding lines and the die-cast substrates, compact in structure of multilayer and multichannel welding lines, high in bonding strength of the welding lines and excellent in continuity.

The invention discloses a method for coating cement lining on pipe fitting with a firm cement lining structure, which is characterized by comprising the following steps of: 1, preparing materials: sieving river sand and preparing 801 glue; 2, stirring the materials: weighing fine sand, cement and the 801 glue according to the proportion of 2:(1-1.5):(0.1-0.15) by weight, stirring and uniformly mixing to obtain the lining; 3, preparing prime coat: weighing the fine sand, the cement and the 801 glue according to the proportion of 2:(1-1.5):(0.4-0.7) by weight; 4, coating the lining: coating and brushing the prime coat obtained in the step 3 on the inner wall of the pipe fitting, placing the lining obtained in the step 2 on the inner wall subjected to the prime coat brushing, uniformly spreading the lining by using a tool, pressing the lining by using a tool, modifying the lining to be smooth and flat by using a tool; and 5, curing. The invention has simple process and easy holding, improves the lining strength and the product surface quality, shortens the production period, improves the production efficiency and lowers the production cost.

The invention provides a gas temperature probability density distribution reestablishment method based on a single optical path and multiple spectra. The method comprises the following steps: causinglaser of multiple absorption spectrum segments capable of covering a certain absorption molecule in a gas to be tested to pass through a tested gas area along a single optical path to obtain absorptivity integral measurement data corresponding to the multiple absorption spectrum segments; constructing an integral equation set for solving gas temperature probability density distribution by using the line intensity and the absorptivity integrals of the absorption spectrum segments; and performing normalization and discretization processing on the integral equation set to solve a polynomial fitting parameter of the gas temperature probability density distribution, and calculating the gas temperature probability density distribution. Compared with a multi-view multi-spectrum imaging system, the gas temperature probability density distribution reestablishment method provided by the invention has the advantages that the structure is simple structure, few optical windows are required, a limited number of discrete absorption spectrum segments are used, the gas temperature probability density distribution can be reestablished without the prior information of temperature distribution, the reestablishment speed is high, the effect is excellent, and the application prospect in the field of non-contact non-uniform temperature distribution measurement is wide.

The invention provides a full-automatic spraying curing equipment for a tunnel. The equipment is suitable for curing concrete at the top of the tunnel and mainly comprises a distance sensor, sprayingassemblies, a support, a lifting device, a lifting motor, a water pump, a traveling motor, a chain transmission, a vehicle body, a water tank, a magnetic flip liquidometer and an electric control cabinet. The full-automatic spraying curing equipment is easy and convenient to operate and can automatically travel, travel in the opposite direction and spray, and as needed, the equipment can also be switched to be manually controlled. The water spraying amount can be automatically adjusted to enable the water spraying amount to be in the best state, so that cracks in the surface of lining concreteare effectively reduced, the concrete lining strength and durability are guaranteed, economic benefits are indirectly generated, and the equipment is suitable for curing construction of various typesof tunnel lining concrete. By means of the equipment, construction efficiency is improved, the curing procedure cost is lowered, the concrete appearance quality is improved, air in the tunnel is purified, and safety and reliability are improved. The full-automatic spraying curing equipment further has the advantages of being concise and compact in structure, low in manufacturing cost and easy andconvenient to use.

A transparent plate includes a transparent substrate and an antifouling layer. A surface of the transparent substrate includes a fine projecting and recessed structure with a surface roughness of 2.0-100 nm. The antifouling layer includes fluorine, and at least a part of the antifouling layer is formed on a position of the fine projecting and recessed structure. A haze value of the transparent plate at the position of the fine projecting and recessed structure is 2% or less. A value of X defined by (S1—S2) / (S3—S2) is 0.5 or more, where S1, S2 and S3 are F—Kα line strengths of the transparent plate at the position of the fine projecting and recessed structure, a reference glass plate that does not include fluorine, and a reference aluminosilicate glass plate that includes fluorine of 2 wt %, respectively, and S1, S2 and S3 are measured by a fluorescent X-ray measurement device.

The invention discloses a repairing method of a gray pig iron heterogeneous welding line. The method comprises the steps of preweld cleaning preparing, welding current selecting, adopting the heterogeneous welding material EZNiFe for gray pig iron cold welding, postwelding hammering and the like. The repairing method of the gray pig iron heterogeneous welding line is provided for overcoming the defects that an existing gray pig iron casting generating cracks and other defects is not prone to being repaired, in the welding repair process, the welding line plasticity is low, and the welding linestrength is poor; the repairing method of the gray pig iron heterogeneous welding line mainly uses the heterogeneous welding material EZNiFe for gray pig iron cold welding, the welding line plasticity is improved while it is ensured that the welding line strength is not reduced, the white cast of the welding line is reduced, the casting obtains the good cutting machining property, and the traditional gray pig iron welding line is converted into the heterogeneous welding line from the homogenesis welding line.

The invention provides a method for measuring oxide, phosphorus, manganese and copper content of directly reduced iron. The method comprises the following steps of: measuring the X-ray fluorescent line strength of a test sample to be tested by using conventional X-ray fluorescent spectrometry, and obtaining corresponding oxide, phosphorus, manganese and copper content values in a standard working curve of oxide, phosphorus, manganese and copper according to the X-ray fluorescent line strength, wherein the test sample to be tested is obtained by firing, adding lithium tetraborate, lithium nitrate solution and ammonium iodide solution, mixing, drying, heating till melting and cooling. After the sample is melted at one time, the silicon dioxide, calcium oxide, magnesium oxide, aluminum sesquioxide, titanium dioxide, potassium oxide, phosphorus, manganese and copper content of the test sample can be directly measured; and the method is convenient for operation, has high measurement accuracy and good measurement result stability, reproducibility and accuracy, and can meet daily measurement. The prepared standard test sample and the test sample to be tested can be stored for a long term and reused, so the cost is reduced, the pollution is reduced, and the measurement time can be greatly shortened.

The invention discloses a determination method of pulp polymerization degree distribution, comprising the following process steps: Weighing a pulp sample, dispersing the pulp into single fibers, drying the single fibers until the moisture content of the single fibers is less than 5%, placing methylene chloride and fuming nitric acid into a flask, cooling in an ice salt bath, adding phosphorus pentoxide to obtain mixed acid, taking out the flask, and adding the pulp sample with water content being less than 5 % for nitrification; filtering by a sand core funnel, washing the nitrocellulose in the funnel with methylene chloride, and then washing with methanol, and finally washing with distilled water fully until the pH is equal to 7, placing in boiling water for boiling, filtering and blotting up, washing with cold distilled water again, and then drying in a drying oven until the moisture content is less than or equal to 10%; dissolving the sample with tetrahydrofuran, preparing solution with cellulose content of 0.1%, and determining the polymerization degree with GPC (gel permeation chromatography). In the invention, precise molecular weight and molecular chain length of pulp cellulose can be obtained, and thread line strength can be ensured.

The invention provides a method for welding a stud to high-nitrogen stainless steel. The method solves the problems that at present, conventional manual electric arc welding is large in operation difficulty; the welding quality is instable; forming is poor; welding strength is low; and the efficiency is low. The stud is made of austenitic stainless steel; a circular cone head of 120 degrees to 150 degrees is arranged on the welding end face; the welding current A ranges from 850 A to 2200 A; the welding time T ranges from 350 ms to 1000 ms; and the extending amount P ranges from 3 mm to 5 mm; the lifting amount L ranges from 2.5 mm to 3.5 mm. According to parameters, an accessory base is welded to the middle and high nitrogen stainless steel in a stud welding manner. Through adoption of austenitic stainless steel stud materials and selection of welding process parameters, the effects that when the stud is welded to the high-nitrogen stainless steel, the welding quality is stable, the welding line strength is high, and the efficiency is high are achieved; the stud welding manner adopts to welding of the high-nitrogen stainless steel of the medium and high strength; forming is attractive, the welding line strength is large; welding plate deformation is small; and the welding efficiency is greatly improved.

A method and an apparatus identify a spicule candidate in a medical image. The method according to one embodiment accesses digital image data representing an image including a tissue region; processes the digital image data by generating at least one line orientation map and at least one line strength map for the tissue region for at least one scale, using separable filters; calculates spicule feature values based on the at least one line orientation map and the at least one line strength map; and identifies a spicule candidate based on the calculated features values.

The invention belongs to the field of molding or connecting of plastic, particularly belongs to the field of equipment for jointing prefabricated parts, and relates to a feeding clearance control method and device of a seamless welding machine for plastic-steel doors and windows. A plastic steel profile has the advantages of good sound insulation, heat insulation, corrosion prevention, impact resistance and the like, and is mainly used as push-pull and casement windows and doors, a guardrail, a tubular product and a ceiling material. The plastic-steel doors and windows adopt a hot plate welding method at present; the existing device adopts an open-cycle scheme, is overlarge in welding redundancy, and large in welding beading, and an obvious welding line exists after a corner is cleaned. According to the feeding clearance control method and device of the seamless welding machine, the displacement of a rear seat and the thrust of a cylinder are detected through an approach switch and a force sensor and fed back to a PLC (programmable logic controller) to form a closed loop; the stroke and the thrust of the cylinder are controlled; locating clearance control, molten clearance control and butt thrust control can be accurately achieved; the welding beading can be effectively reduced; and the feeding clearance control device is beautiful in surface, and high in welding line strength, can save the material, and can be applied to welding connection of color plastic steel profiles.

The invention discloses a method for judging the applicability of a shield tunnel under the ground crack environment. In the shield tunnel under the ground fissure environment, the relationship between the maximum vertical deformation of lining and lining thickness, the relationship between the maximum tensile stress of lining and lining thickness, and the relationship between the maximum compressive stress of lining and lining thickness are obtained under the same staggered distance between upper and lower coils of ground fissure and tunnel lining strength. Under the same staggered distance between upper and lower walls of ground cracks and tunnel lining thickness, the relationship between the maximum vertical deformation of lining and lining strength grade, the relationship between the maximum tensile stress of lining and lining strength grade, and the relationship between the maximum compressive stress of lining and lining strength grade are obtained. Under the same staggered distance between upper and lower walls of ground cracks and tunnel lining thickness, the relationship between the maximum vertical deformation of lining and lining strength grade, the relationship between the maximum tensile stress of lining and lining strength grade, and the relationship between the maximum compressive stress of lining and lining strength grade are obtained. Through the above curves and standards, the method can more accurately determine whether the shield tunnel under different working conditions to meet the strength and deformation requirements.

The embodiment of the invention discloses a sound mixing method, apparatus and device, and a storage medium. The sound mixing method comprises the following steps: receiving audio streams of at leasttwo sound channels; figuring out the waveform envelope line strength of the amplitude or energy of each audio stream; allocating a sound mixing weight of the audio stream according to the proportion of the waveform envelope line strength of each audio stream in the sum of the waveform envelope line strength of all audio streams, wherein the positive correlation of the sound mixing weight and the proportion is within a preset range; and performing sound mixing according to each audio stream and the sound mixing weight corresponding to the audio stream to obtain an audio stream subject to soundmixing. According to the sound mixing method disclosed by the embodiment of the invention, the sound mixing weight is allocated through the proportion of the waveform envelope line strength of the amplitude or energy of the audio stream in the sum of the waveform envelope line strength of all audio streams, so that the voice audio stream with higher amplitude or energy is allocated with a greatersound mixing weight due to the higher waveform envelope line strength, and then the voice audio stream is clearer after the sound mixing.

A monofilament line straightening device and a monofilament line straightening method according to the present invention perform steam blow and / or pressing using a heated trowel member to a monofilament line in the state where its tension is loosened by a predetermined amount relative to the state where it is suspended without being loosened, thereby removing curls in the monofilament line. Thus, a reduction in the line strength which might occur when removing the curls in the monofilament line by heating can be suppressed.

The invention belongs to the technical field of laser spectral analysis and detection methods and particularly relates to self-absorption immune laser-induced breakdown spectroscopy. An element content measuring method based on resonance and non-resonance double lines has the advantages that a plasma optically thin time window is determined by comparing the double line strength ratio of a to-be-measured element and the theoretical strength ratio, and the resonance line and the non-resonance line are used to expand the measurable range of an element linear calibration curve; due to the fact that the optically thin spectral lines can be directly captured, self-absorption influence is avoided effectively by selecting the resonance and non-resonance double lines, the high-linearity calibrationcurve is obtained, and the method is small in measuring errors and wide in element linear calibration curve range.

The invention discloses a novel high efficiency double excitation brush generator, which comprises a rotor and a stator. The rotor is composed of a transmission shaft, a N-pole claw pole, a S-pole claw pole and a excitation coil, wherein the N-pole claw pole and the S-pole claw pole are composed of soft magnetic materials, the excitation coil is arranged inside the N-pole claw pole and the S-pole claw pole, and the claw pole of the N-pole claw pole and the S-pole claw pole are interlaced distributed, which is characterized in that a permanent magnetic block is arranged between two adjacent claw poles in the N-pole claw pole and the S-pole claw pole, and one side of the permanent magnetic block closed to the N-pole claw pole is N pole, the side closed to the S-pole claw pole is S pole. The polar claw rotor of the invention, a magnetic induction line produced by claw pole and the magnetic induction line produced by the permanent magnetic block through the external stator at the same time, therefore, the magnetic induction line strength of the external magnetic circuit on the rotor is increased, the power output is effectively increased as generator, the efficiency of double excitation brush generator is improved and a enameled wire is saved. The generator has the advantages that the structure is simple and reasonable; the beneficial effect is obvious, and suitable for application and popularization.