677results about How to "Method stable" patented technology

The invention discloses a grain moisture content detecting method based on a hyperspectral image technology, which comprises the following steps: respectively acquiring an all black calibrated image B, an all white calibrated image W and a hyperspectral original data image I of grains the moisture content of which is given; carrying out reflection spectral correction on the hyperspectral original data image I of grains by the all black calibrated image B and the all white calibrated image W to obtain a corrected image R of grains; extracting the grain image from the corrected image R; carrying out spectral correction by a moving average method and multiplicative scatter correction; calculating the correlation coefficients of spectral reflection values and the moisture content; selecting a correlation coefficient as the maximum spectral reflection value to be input into an artificial neural network; and establishing a grain moisture prediction model. In the invention, the grain moisture content is detected by the artificial neural network according to the spectral signature of the grains caused by the moisture content, a quick stable method is provided, and the detecting efficiency is improved.

The invention provides a permanent magnet synchronous motor servo driving device and a position control method thereof. The permanent magnet synchronous motor servo driving device mainly comprises a controller, a power inverter, a current sensor, a position sensor and a permanent magnet synchronous motor. Besides the adoption of the controller structure, correction information of velocity feedback is also used for effectively reducing position following deviation. The position control method for the permanent magnet synchronous motor servo driving device compensates disturbance by designing and using torque observation of velocity model deviation. The implementation is simple, the torque observation result is not affected by velocity change, the quickness of position follow is improved, and the disturbance adaptability of a load is improved.

The invention relates to a construction method of ganoderma spore powder polysaccharide fingerprint and a standard fingerprint of the ganoderma spore powder polysaccharide, belonging to the fingerprint technical field of the traditional Chinese medicine and products thereof and the functional food raw material and products thereof. The construction method in the invention comprises the following steps: extracting ganoderma spore powder polysaccharide; hydrolyzing a part of ganoderma polysaccharide; performing PMP derivatizing reaction on a part of the hydrolyzate of ganoderma polysaccharide; performing reversed phase HPLC fingerprint analysis and determining the standard fingerprint; performing the HPLC analysis on the polysaccharide fractions of ganoderma spore powder samples from fifteen different producing areas and comparing the fingerprints of the ganoderma spore powder samples to determine the common fingerprint characteristics so as to obtain a standard fingerprint. The fingerprint has nineteen common peaks in all, the sum of the peak areas of the common peaks accounts for 98% of the total peak area, and the peak area of each of four fingerprint peaks is more than 5% of the total peak area. The method in the invention is stable, has high degree of precision and good repeatability and is easy to grasp; and the quality situation and producing area of the ganoderma spore powder polysaccharide can be grasped from the overall characteristic of the chromatography, and a new scientific method for the quality control and identification of ganoderma spore powder can be provided.

The invention discloses a method and a device for precisely positioning a large part of an airplane in place. The device is arranged in a transition part of connecting a positioner and the large part of the airplane; the positioner is a modularized unit which can realize motion in three mutual vertical directions and has high positioning precision and reliable work; through certain configuration, effective support and posture adjustment on the large part of the airplane can be formed. The device for precisely positioning the large part of the airplane in place has a positioner supporting plate; the bottom of the positioner supporting plate is provided with a sensor fixing bracket; the sensor fixing bracket is provided with four liner displacement sensors; the upper part of the positioner supporting plate is provided with a pressing plate; the top part of the pressing plate is provided with an emitter bracket; the emitter bracket is provided with a plurality of laser emitters; the inside of the positioner supporting plate is provided with a ball strut which is in interference fit and connection with an inner hole of the positioner supporting plate; the outer side of the positioner supporting plate is provided with a plurality of cylinders; and a piston rod of each cylinder is connected with a locking square cotter. The method and the device have simple operation, high positioning precision, good safety and reliable positioning algorithm.

The invention provides a method for establishing a fingerprint spectrum of a liver-enhancing medicine. The liver-enhancing medicine is composed of oriental wormwood, isatis root, angelica, white paeony root, red-rooted salvia root, Radix curcumae, Astragalus mongholicus, Codonopsis pilosula, rhizoma alismatis, sealwort, rehmannia, yam, hawthorn, large-leaved gentian, liquorice and medicated leaven. The establishing method comprises the step of detecting paeoniflorin in the liver-enhancing medicine by using a high efficiency liquid chromatography method, wherein conditions are as follows: a chromatographic column takes octadecylsilane chemically bonded silica as a filling material; mobile phases comprise a mobile phase A which is acetonitrile and a mobile phase B which is an acidic water solution, and the mobile phases are subjected to gradient elution; the flow velocity is 1.0mL / min; the column temperature is 30 DEG C; the detection wavelength is 210nm to 400nm; and the number of theoretical plates is calculated according to the paeoniflorin peak and should not be less than 6000. The obtained fingerprint spectrum is a chromatographic peak which mainly takes active ingredients of the large-leaved gentian, the white paeony root, the liquorice, the red-rooted salvia root, the oriental wormwood and the astragalus mongholicus in raw materials of the liver-enhancing medicine as main parts. According to the establishing method provided by the invention, the fingerprint spectrum capable of comprehensively representing the active ingredients of the liver-enhancing medicine can be effectively obtained and has the characteristics of high precision, stability and repeatability. The obtained fingerprint spectrum can be used for guaranteeing the stability and consistency of the product quality, so that the safety and effectiveness of a product are guaranteed.

The invention discloses a method and system for determining the type of an apnea event. The method comprises the steps of acquiring the waveform of breathing movement of a patient, calculating the amplitude of the waveform formed during the apnea event of the patient, and determining the type of the apnea event according to the amplitude. Compared with the prior art, the type of the apnea event is determined according to the waveform of the breathing movement of the patient during apnea period of the patient, the effect of pressure oscillation signals on the patient is avoided, and the effect of resistance or air leakage in an air path on a determination result can be avoided. In addition, according to the method, the requirement for the performance of a draught fan is not high, the normal treatment of the patient cannot be affected, and the compliance of the patient can be improved; signals are stable, and the antijamming capability is high.

The invention discloses a preparation method of Fuzhuan tea golden flower fungus spore powder, which comprising the steps of: inoculating golden flower fungus to a CZG slant culture medium, culturing for 5days at a temperature of 26-30 DEG C to obtain a seed culture; adding sterile water in the seed culture, washing down golden flower fungus spores, fully oscillating to obtain a uniformly-dispersed spore suspension; inoculating the spore suspension on the culture medium, carrying out constant-temperature culture at 26-30 DEG C, covering with a sterile breathable sealing film before white hypha germinates, removing the sterile breathable sealing film when yellow hypha germinates, continuously culturing for 3-5 days to obtain a yeast seed; then carrying out enlargement to obtain mouldy bran; and crushing the mouldy bran and then sieving to obtain the Fuzhuan tea golden flower fungus spore powder. The artificially cultured Fuzhuan tea golden flower fungus spore powder can be used for extracting effective components of the golden flower fungus and inoculating fermented Fuzhuan tea; and the fermentation period can be shortened and the pollution of infectious microbe is reduced.

The invention belongs to the new material alloy element analysis technology, and relates to an analysis method for determining titanium, vanadium, tungsten, manganese and silicon in a K25 chromium-base high temperature alloy. The analysis steps comprise: weighing a sample; preparing a sample solution; preparing a calibration solution; measuring concentrations of titanium, vanadium, tungsten, manganese and silicon in the sample solution; and calculating the measurement result to obtain contents of titanium, vanadium, tungsten, manganese and silicon. According to the present invention, the ICP-AES method for determining contents of titanium, vanadium, tungsten, manganese and silicon in the K25 chromium-base high temperature alloy is provided, wherein the method has characteristics of high analysis sensitivity, simple operation, short analysis period, high efficiency and wide application prospect, can meet engineering application of the high temperature alloy, can meet requirements of scientific research and production on material quality control, and further has characteristics of product scrap rate reduction, development saving and production cost saving.

The invention discloses a polysaccharide degradation method and low-molecular-weight polysaccharide, and relates to the field of degradation of a polysaccharides compound. The polysaccharide degradation method comprises the following step: treating a polysaccharide solution by adopting a high-pressure cell crushing device to obtain the low-molecular-weight polysaccharide. The polysaccharide degradation method disclosed by the invention overcomes the shortcomings that a conventional ultrasonic method is long in time and low in efficiency, a chemical method is low in reaction regularity and hasa hardly controlled process, and an enzyme hydrolysis method is low in applicability and high in cost and can hardly realize large-scale production. According to the method, the high-pressure cell crushing device is adopted to degrade polysaccharide, so that the polysaccharide which has a relatively low molecular weight is obtained by shearing and collision at high pressure; the molecular weight of the polysaccharide can be precisely controlled by adjusting the treatment pressure and the number of times; the polysaccharide degradation method has the advantages of small noise, zero pollution and high speed, and the physiological activity of the polysaccharide cannot be destroyed.

The invention provides a construction method of a wolfberry fruit polysaccharide multi-element fingerprint spectrum and a wolfberry fruit polysaccharide standard fingerprint spectrum, belonging to the technical field of traditional Chinese medicine and functional food raw materials and a fingerprint spectrum of the product. The construction method comprises the following steps: pretreating wolfberry fruits, extracting wolfberry fruit polysaccharide, determining a UV standard fingerprint spectrum, determining an HPSEC standard fingerprint spectrum, analyzing an IR light spectrum fingerprint and determining the standard fingerprint spectrum, completely hydrolyzing, deriving a hydrolyzed product, and analyzing a PCD-HPLC fingerprint and determining the standard fingerprint spectrum. The pretreatment, extraction of the wolfberry fruit polysaccharide and construction method of the multi-element fingerprint spectrum of 16 types of wolfberry fruits in different production areas are the same as above and can be operated simultaneously and respectively. The construction method of the wolfberry fruit polysaccharide multi-element fingerprint spectrum has the advantages of simplicity in operation, stability, flexibility, high precision, good repeatability and the like; and the quality condition and production area resources of the wolfberry fruit polysaccharides can be grasped from a whole characteristic appearance of a chromatogram and a novel scientific method is provided for wolfberry fruit quality control and true and false identification.

The invention discloses a method for establishing a lonicerae and forsythiae powder UPLC fingerprint spectrum.The method can quickly and accurately identify authenticity and merits of a product and has the advantages of simplicity, convenience, stability, high precision, good repeatability and the like.By means of the method, kinds and quantity of chemical components contained in lonicerae and forsythiae powder can be comprehensively reflected, global description and evaluation are conducted on the quality of the lonicerae and forsythiae powder, the quality and the medicine effects of the lonicerae and forsythiae powder are truly combined, which is conductive to illuminating the function mechanism of the lonicerae and forsythiae powder, and a basis is provided for technical promotion and deep development of the lonicerae and forsythiae powder.By means of the method, the number of the chemical components detected in the lonicerae and forsythiae powder fingerprint spectrum is relatively large, characteristic peak height proportions are moderate, a base line is stable, and the separation degree, peak shapes and column efficiency are good.

The invention provides a method of extracting polysaccharide of enteromorpha by enzymolysis in steps. The method comprises the following steps: by taking enteromorpha as a raw material, soaking the enteromorpha powder by water after impurity removal and crushing; then, respectively carrying out enzymolysis in steps on the aqueous extract of the enteromorpha by using pectinase, cellulase and papain; then, inactivating the enzyme, concentrating by centrifuging and precipitating by ethanol; and finally, vacuum-drying to obtain the polysaccharide of the enteromorpha. The method provided by the invention is high in yield, high in product purity, low in energy consumption, free from pollution, high in biological activity, suitable for production of polysaccharide of enteromorpha on a large scale, beneficial to development and utilization of resources polysaccharide of enteromorpha, and remarkable in economic and social values.

The invention relates to non-methane hydrocarbon analysis equipment and method and belongs to the technical field of organic gas detection. The non-methane hydrocarbon analysis equipment comprises a six-way valve, a quantifying ring, a first gas storage pipe, a second gas storage pipe, a multi-way valve, a molecular sieve filling pipe, a first air source and a detector. By virtue of exquisite coordination of the elements, firstly the six-way valve and the multi-way valve are arranged at load stations, so that to-be-detected gas passes through a molecular sieve, non-methane hydrocarbon in the to-be-detected gas is removed, the first gas storage pipe and the second gas storage pipe are filled with the to-be-detected gas containing no non-methane hydrocarbon, taken as background gas, and then the six-way valve and the multi-way valve are arranged at feeding stations, so that zero-level compressed air pushes air in the second gas storage pipe, the quantifying ring and the first gas storage pipe to sequentially enter the detector, namely the second gas storage pipe and the background gas in the second gas storage pipe are taken as a base line. The non-methane hydrocarbon analysis equipment and method can be used for solving the problem that errors of measured values are overlaid due to adoption of a direct minusing method when methane concentration is close to concentration of a total hydrocarbon compound, and have the advantages that detection results are accurate and the method is reliable and stable.

The invention relates to a controlled light plane-based underwater three-dimensional redrawing device and a controlled light plane-based underwater three-dimensional redrawing method. The device comprises a computer control device with software, a light plane control device with a reflecting lens, a charge coupled device (CCD) camera, a light plane generator and a sealed shell of which the front is provided with a glass window and one side is provided with a waterproof interface. The redrawing method comprises the following steps of: establishing a global coordinate system and a camera coordinate system by using the light plane control device and the CCD camera; correcting a light plane equation before refraction, and resolving a light plane equation after refraction; resolving a refraction compensation parameter k, and compensating a pixel coordinate of each point to be detected; and resolving a coordinate of a point to be detected according to the corrected light plane equation and the pixel coordinate of the point to be detected and a geometrical relationship between a light plane and the CCD camera so as to realize the three-dimensional redrawing of an object to be detected. By the invention, the refraction influence is effectively avoided, the three-dimensional redrawing of an underwater object is realized, the structure is simple and the accuracy is high.

The invention provides a high-precision camera dynamic calibration method, and belongs to the technical field of image processing and machine vision detection. The method includes detection of checkerboard target image X type calibration points; high-precision positioning of checkerboard target X type calibration points; camera calibration based on non-measurement distortion correction; and camera dynamic calibration. The method is stable, reliable and practical, and is applicable to camera calibration in a simple background and complex background and under a large-visual-field condition at the same time. The method has a simple calibration process and good real-time performance, for a target characteristic area in a sequence image, a user only needs to match a first frame of image target area, only needs arbitrary i frames of single images to complete single-time camera calibration, and a corresponding homography matrix Hi is determined. In the method, parameter coupling does not exist, the whole calibration process only needs to solve and optimize single distortion coefficients. The calibration precision is improved through high-precision positioning of the target calibration points and an optimization method of nonlinear camera imaging model distortion coefficients.

The invention provides a pretreatment method for measuring pesticides of glyphosate and phosphinothricin in tea leaves. In general, acidic precipitation, solid phase extraction, precolumn derivatization and a liquid chromatograph / mass spectrometer are used for measuring, and a method for measuring the residual amounts of glyphosate and phosphinothricin in the tea leaves by using the liquid chromatograph / mass spectrometer is established. In the method, a large quantity of tea polyphenols in the tea leaves are precipitated, so that the deviation efficiency of solid phase extraction liquid and 9-fluorenylmethyl chloroformate is increased, the interference of impurities is reduced, and the high sensitivity is realized. The method is accurate, efficiency and stable, can meet the requirement of residue detection, and can be applied to the qualitative and quantitative analysis of the glyphosate and the phosphinothricin in the various tea leaves.

The invention discloses a polyaspartate polyurea adhesive and a preparation method thereof. The polyaspartate polyurea adhesive comprises a component A and a component B spaced from each other before being used, wherein the component A and the component B are mixed at a weight ratio of 4 to (1-1.05) when being used; the component A comprises the following components in parts by weight: 4.0-5.0 parts of polyaspartate polyurea, 4.0-4.50 parts of fillers, 0.005-0.01 parts of a defoamer and 0.005-0.01 parts of a leveling agent; the component B is hexamethylene diisocyanate trimer. According to the polyaspartate polyurea adhesive, the component A and the component B are mixed, so that the bonding strength in a bonding process is high and especially the bonding strength between the adhesive and a cement matrix is high; moreover, the adhesive has excellent performances of chemical corrosion resistance, water resistance, weather resistance, temperature resistance, low VOC (volatile organic compounds), environmental protection and the like.

A semiconductor element structure includes a first MOS having a first high-K material and a first metal for use in a first gate, a second MOS having a second high-K material and a second metal for use in a second gate and a bridge channel disposed in a recess connecting the first gate and the second gate for electrically connecting the first gate and the second gate, wherein the bridge channel is embedded in at least one of the first gate and the second gate.

A production method optimization method of an ammonia synthesizer which is based on the data mining technology belongs to a research frontier of the cross discipline field of chemical engineering, system engineering, and data mining and the like. The invention combines production characteristics of ammonia synthesizers, in accordance to parameter data and analytical measurement data of history production technology of the ammonia synthesizers which are gathered by the distributed control system, namely DCS, production and optimization target of the ammonia synthesizers and mathematical models between the relative technological parameters are established by utilizing the data mining technology. And real time data which are produced by the ammonia synthesizers are input in the mathematical models which are established, and production status of the ammonia synthesizers are assured by the models, and models establishing and maintenance, working order diagnosing, target predicting, and optimum operation guide of ammonia synthesizers are achieved. And the ammonia synthesizers are operated under optimum state, and production capability and control level of the device are improved. The method has the advantages of safety and reliability, small risk, low cost, and easy pauperization.

The invention discloses a novel method for efficient and rapid seedling establishment of strawberry stolons. The method comprises the following seedling establishment steps of strawberry stolon inducing, stolon cutting, grading and preprocessing, aerial root inducing, transplanting and seedling establishment. The method can be used for efficient and rapid seedling establishment of elevated stolons of excellent new strawberry species of Hongyan, Zhangji and the like. According to the novel method, the defect that rooting of stolons formed early is difficult is overcome, and by inducing the early stolons to generate aerial roots and then transplanting the stolons to a substrate and adopting a mode of short-term darkness culture, efficient and rapid seedling establishment of the strawberry stolons is achieved. By means of the novel method, the seedling establishment rate is generally 85%-89% or above, and the advantages of being simple, convenient to operate, high in seedling establishment speed and the like are achieved. Compared with cuttage, the method for inducing the stolons to generate the aerial roots is simple and convenient, and needed time is short and concentrated; the quality of offspring stolon seedlings generated through the method in different times and different batches is high and more stable.

The invention relates to a fingerprint map for controlling the quality and efficacy of rhizoma corydalis and preparation of the rhizoma corydalis and a preparation method of the fingerprint map. The invention discloses that the fingerprint map is one of anti-myocardial ischemic active site in the rhizoma corydalis, and the active site mainly comprises quaternary ammonium base components, wherein, columbamine, 13-methyldehydrocorydalmine, dehydrocorybulbine, palmatine, dehydrocorydaline are the main five components of quaternary ammonium base. The fingerprint map can identify the authenticity of samples and evaluate the quality and efficacy of the rhizoma corydalis or the preparation thereof, so that the quality of the rhizoma corydalis and the preparation thereof have real controllable standards, so as to ensure the product quality to be stable. The method has the advantages of being simple to operate and being accurate and reliable, which is applicable to controlling the quality and efficacy of the rhizoma corydalis and the preparation thereof.

The invention relates to a high-pressure water vapor degradation method for marine sulfated polysaccharides. The method is characterized in that the marine sulfated polysaccharides are prepared into water solution, then the water solution is treated by high-pressure water vapor at the temperature of 101-150 DEG C for 0.01-24hours, and the obtained treatment solution is dried for obtaining degraded products of the polysaccharides. The marine sulfated polysaccharides comprise seaweed fucoidan, carrageenan and agaropectin which are sourced from marine plants, as well as sea cucumber chondroitin sulfate, sea cucumber fucoidan and abalone sulfated polysaccharides, which are sourced from marine animals. The method has the advantages that no inorganic salt is introduced, and the final products can be obtained by drying after degradation without desalinization; the molecular weight of the polysaccharides can be reduced continuously and uniformly, and the degraded products with different molecular weight can be obtained by controlling the treatment conditions and the treatment time; the method is stable, and the reproducibility is good; and the requirement on equipment is low, and the operation is simple.

The invention discloses a rapid determination of molybdenum content in iron and alloys. According to the method, an iron or alloy sample is adopted. A phosphoric acid-perchloric acid mixed solution is employed to dissolve and oxidize the sample. In a sulfuric acid-phosphoric acid medium, an ascorbic acid is used as a reducing agent to prepare a sample solution, a working curve technique is employed to calculate the molybdenum content, so that molybdenum (V) cannot be reduced to lower valence molybdenum, and the result can have good repeatability. Due to the oxidation effect of a lot of perchloric acid, the unstable color development and large determination result error phenomena arising in dissolution of a tungsten and vanadium-containing sample by sulfuric acid-phosphoric acid or reduction of the sample by stannous chloride. In the sulfuric acid-phosphoric acid medium, the color development solution is stable, and reduction needs no adding of iron as the conditioning agent, thus eliminating the influence brought by iron in the solution. During sample dissolution, there is no need to add nitric acid at the time of smoking to destroy a carbide. The analysis time is only 1 / 5-1 / 4 of that of the alpha-Benzoin oxime gravimetric method. Fewer instruments and reagents are used, thus reducing the determination cost. Compared with conventional spectrophotometry, the method broadens the mass fraction measurement range.

The invention provides a retrieval method and system for a hydrofracture microseism focal mechanism. The retrieval method comprises the steps of P wave amplitude curve pickup, P wave amplitude curve correction, P wave amplitude curve smoothing and fault nodal plane solution retrieval extraction. By establishing an amplitude correction factor and a median filter operator, a pickup P wave amplitude curve is processed and a grid point search algorithm is used for retrieval of a fractured fissure foal mechanism. The method is stable and effective and can promote the development of the hydrofracture ground microseism monitoring data processing technology to a certain extent.

The invention relates to a drink containing soy peptide and edible fungi polysaccharide and a preparation method thereof. The drink has an anti-fatigue effect. Raw materials comprise soy flour, edible fungi and the like. The preparation method comprises the following steps of: obtaining fermentation liquid containing the soy peptide and the edible fungi polysaccharide after hydrolyzing soy protein by using protease generated by the edible fungi in the growth process through a liquid fermentation process; and finally preparing the drink. The edible fungi are selected from lucid ganoderma, Cordyceps sinensis and grifola. The method comprises the steps of preparing a culture medium, activating a strain, fermenting, culturing, carrying out membrane filtration and the like. The drink containing soy peptide and edible fungi polysaccharide and the preparation method thereof provided by the invention have the advantages that: the source of the raw materials is not influenced by the external environment; physiological active substances of the fungi polysaccharide, polypeptide and the like obtained by using the method have the effects of anti-cancer, anti-aging and the like; the soy peptidecontains amino acid required by human bodies; furthermore, compared with other proteins, the soy peptide is easier to absorb and can rapidly provide energy to accelerate muscle fatigue recovery; the method is simple, stable and efficient; and the quality of the prepared drink is high and contains the soy peptide and the edible fungi polysaccharide simultaneously.

The invention provides a fragment matching method based on contour curvature. The method comprises steps as follows: firstly, fragments are pre-processed, a curvature string of a contour curve of each fragment is acquired, then each closed contour curve is segmented into curve edges by the aid of contour corners, regular fragment boundaries are rejected, and finally, longest matched curve sections among contours are found out with an LCS (longest common subsequence) algorithm and spliced. According to the method, on one hand, the matched curve section search range is defined by the aid of the contour corners of the fragments, so that the time for searching the matched contours is shortened, and the time complexity of the algorithm is greatly reduced; on the other hand, the regular fragment boundaries with constant curvature are rejected, so that mismatching is reduced, and the accuracy of the algorithm is improved.

The invention discloses an establishment method for a UPLC fingerprint spectrum of a gynecological reconstruction pill. According to the method, the authenticity and merits of the product can be quickly and accurately identified, and the advantages of being easy and convenient to use, stable, high in precision, good in reproducibility and the like are achieved; in addition, the variety and number of chemical components contained in the gynecological reconstruction pill can be comprehensively reflected, then the quality of the gynecological reconstruction pill is integrally described and evaluated, therefore, the quality and the medicine effect of the gynecological reconstruction pill can be truly combined together, illumination of the action mechanism is promoted, and a basis is provided for technology improvement and deep development of the gynecological reconstruction pill. Furthermore, the fingerprint spectrum, detected through the method, of the gynecological reconstruction pill contains relatively more chemical components and is moderate in height proportion of all characteristic peaks, stable in base line and good in separation degree, peak shape and column efficiency.

The invention relates to a method for controlling an IGBT inverter type submerged arc welding machine. The method comprises the following steps: adopting a singlechip to sample welding current and voltage, and comparing the welding current and the voltage with preset current and voltage to obtain current deviation and voltage deviation; carrying out PI calculation according to the current deviation, outputting a control parameter, sending a voltage signal to a pulse width modulator after the control parameter is converted into the voltage signal to obtain two groups of mutually inverted pulse width signals, and controlling the on and off of a main circuit IGBT by the signals through power amplifying and driving; carrying out PI calculation according to the voltage deviation, outputting a control parameter, sending analog voltage which is converted by the control parameter to another pulse width modulator, modulating a pulse signal, and controlling the on and off of an MOSFET by the signal through driving and amplifying; and generating a PWM signal by the singlechip according to a given welding speed, driving the on and the off of the MOSFET by the signal after photoelectric isolation and signal amplification, and adjusting running speed of an electric motor of a trolley. The method has the advantages of stability, reliability and convenient use, and can achieve automatic submerged arc welding better.