93results about How to "Reduce the conditions of use" patented technology

The present invention discloses a nanometer material transmission electron microscope in-situ testing chip, a preparation method and applications thereof, and belongs to the technical field of nanometer material performance in-situ testing. The chip comprises a silicon substrate, insulating layers and a film window, wherein the insulating layer respectively grows on both surfaces of the silicon substrate, a metal film or device or a semiconductor function film or device grows on the chip front surface insulating layer so as to apply various physical and chemical effects on a sample, the center of the chip is provided with the film window, and the film window region is provided with a electron beam penetrating long hole or electron beam penetrating long groove having a large aspect ratio. According to the present invention, the transmission electron microscope sample can be subjected to in-situ measurement under the atomic scale resolution, the nano-wire samples and the nano-tube samples can be subjected to in-situ characterization, the bulk samples and the heterojunction interface samples can be subjected to in-situ characterization, the placement of the sample through the micro manipulator in the focused ion beam system and the laboratory can be achieved, and the sample transferred and fixed on the chip can be continuously processed by using the ion reduction equipment.

The invention provides a water-soluble salt core type metal powder injection molding technology and relates to the technical field of metal powder injection molding. The technology comprises the steps of mixing, water-soluble salt core preparing, mold core inlaying and mold clamping, injection molding, core-removing drying, degreasing and sintering. According to the technology, a fused and poured water-soluble salt core forms a part cavity and can be dissolved and removed through clean tap water at indoor temperature, the removal time is short, the safety is high, the environmental friendliness is high, and the potential problems of production insecurity, environmental pollution and strength reduction of green bodies caused by polymer core removal can be effectively solved. Part products manufactured through the technology are uniform in internal structure, high in compactness, high in surface smoothness, high in dimensional precision and stable in quality, a great deal of time and cost are saved for volume production of small and precision parts provided with closed or complicated cavity structures and made of various metal materials, the economic benefit is good, and the application prospect is good.

The present invention provides a method for realizing streaming media through mobile terminal, wherein the method comprises the following steps: a step for obtaining broadcast list information of streaming media file on line through a hypertext transfer protocol engine module; a step for explaining the broadcast list information of streaming media file obtained on-line formerly through an expandable mark language engine module; a step for displaying the explained broadcast line information of streaming media file with a list form through a user interface engine module; a step for communicating with a streaming media network server through a radio general packet radio service network module with a real-time streaming transmission protocol for obtaining the streaming media data; and a step of executing audio / video decoding through a audio / video control module to the streaming media data obtained through the radio general packet radio service network module for recovering to the original audio / video data and broadcasting. The method of the invention has the advantages of lower use condition, higher versatility and reduced use cost of user.

The invention relates to a full-spectrum super-resolution measuring method and a label-free biomolecule measurement system. The method and the system are characterized in that membrane layers with different thicknesses ranging from 300nm to 4500nm are arranged on a chip and used for encoding, then sample application is carried out on the chip by means of probe protein to form a biological chip, the probe protein of the biological chip is fully combined with a to-be-tested sample, a to-be-tested object in the to-be-tested sample is arranged on the probe protein through specific adsorption, light beams with light intensity of I0 are vertically cast on the biological chip, when the light beams are vertically cast on the biological chip only covered with the membrane layers, different reflection spectrums are produced due to the different thicknesses of the membrane layers, thickness encoding of the biological chip is achieved, by means of an interference extremum method, the thicknesses t of the membrane layers of the biological chip are decoded according to wavelengths of extreme points in a light spectrum, when the light beams are cast on the to-be-tested object combined with the probe protein, thickness changes of the membrane layers in the range delta occur, intensity amplitude differences are obtained through calculation, and the thickness of the to-be-tested object is obtained. The method and the system can be widely used in thickness measurement of biomolecules.

The invention provides a novel method for detection of human CYP2C19 gene polymorphism. The method comprises the following steps: (1) an ARMS primer is designed. The 3' end of the ARMS primer is a mutation site, and any missense in first-third nucleotide positioned upstream of a mutation site is mutated; (2) after allelic ARMS primer is designed for each SNP, an artificial nucleotide sequence with no homology with human gene sequence is respectively introduced into the 5' end of each of the two specific ARMS primers; (3) according to the introduced general artificial sequence, a Taqman probe which is completely complementary and paired up with the intermediate sequence fragment of the general sequence is designed, and a specific fragment amplified by the ARMS primer is specifically identified. By the above detection method and the kit, the capability of the allelic specific primer in distinguishing different alleles can be greatly enhanced; and accuracy of detection results is guaranteed, cost is greatly saved and efficiency is raised.

The invention discloses a method for preparing isoconazole nitrate, and relates to the field of pharmaceutical chemicals. The method comprises the following steps of: catalyzing a raw material of trichloroacetophenon by using a reduction catalyst to obtain 1-(2,4-dichlorophenyl)-2-chloro-ethanol, performing N-alkylation reaction on the 1-(2,4-dichlorophenyl)-2-chloro-ethanol and imidazole to obtain an intermediate of 1-[2-(2,4-dichlorophenyl)-2-hydroxyethyl]imidazole, etherifying the intermediate and 2,6-dichlorobenzyl chloride, acidizing by using nitric acid for salt formation to obtain crude isoconazole nitrate, and recrystallizing and purifying to obtain the isoconazole nitrate. The catalyst different from the traditional catalyst is used, so that the method is easy to implement, low in cost and high in yield.

The invention discloses a space rotating angle measuring method based on a double-shaft obliquity sensor. The method is to establish a physical model between a sensor and a rotating shaft through a measuring module formed by a double-shaft sensor according to three unknown space angles formed based on an installation mode of the sensor and a spatial relation among the rotating shafts, so as to obtain a calculation method of the three unknown installing angles, so that the rotating angle around the space rotating shafts is detected. According to the traditional technology of detecting an angle through an obliquity sensor, the rotating shafts of a detected object must be levelly arranged, and the sensor and the measuring module also must be kept in level state, all the operations are hard to implement in engineering; compared with traditional technology, the method disclosed by the invention has the advantages that the space rotating angle measuring method can be achieved only if the module is arranged not close and vertical to the level, thereby the space rotating angle measuring method is beneficial for the application in engineering.

The invention relates to the technical field of surveying and mapping, and discloses a tilt measurement method of a surveying and mapping integrated machine based on a GNSS receiver and an IMU sensor.Through the creation of the tilt measurement method, repeated mutual circulation between prediction and correction of designed multi-dimensional unknown state variables is carried out by utilizing akalman filter algorithm principle, so that the multi-dimensional unknown state variables continually approach true values, and then newest three-dimensional attitude angles and newest rotation matrixes from an XYZ coordinate system to a NED coordinate system can be efficiently and accurately obtained based on the multi-dimensional unknown state variables; and finally, coordinates of an antenna phase center of the GNSS receiver are mapped to coordinates at the tail end position of a centering rod through geometric transformation, and thus tilt measurement is completed. According to the tilt measurement method of the surveying and mapping integrated machine based on the GNSS receiver and the IMU sensor, a measurement worker can be completely liberated from a task of bubble centering leveling, and work efficiency is improved; and in addition, any factory calibration does not need to be carried out, self-calibration can always be carried out in the operation process, the work efficiency and the accuracy rate are greatly improved, and unnecessary production processes are reduced.

The invention discloses an inverter heat dissipation system based on semiconductor refrigeration, which includes a semiconductor refrigerator, an intelligent controller and a fan. There is a fan, and the fan starts under the control of an intelligent controller. This kind of heat dissipation system can realize the heat dissipation of high-power heating devices, reduce the use conditions of components, prolong the service life of products, and is small in size and light in weight.

The invention discloses a preparation technology of a titanium alloy under an ultralow temperature condition. The technology comprises the following specific steps of 1, mixing, 2, fabricating an electrode, 3, smelting in a vacuum furnace, 4, cogging, 5, loading a blank of a sawing machine and a reground forging blank into an electric furnace, heating to 1030 DEG C, conducting triaxial upsetting, drawing and rolling, and polishing and repair, 6, loading the polished blank into the furnace, and conducting intermediate repair, and 7, loading a repaired and polished titanium alloy blank into the electric furnace, and conducting upsetting and drawing on 100mm*L and 75mm*L rods after the blank is discharged. The preparation technology has the benefits that a titanium alloy material prepared by the preparation technology is low in impurity content, has ultra-high purity, and can work at -253 DEG C; compared with the existing related titanium alloy material, an operating condition is reduced by 57 DEG C; and the titanium alloy material has a wider application field.

The invention discloses a thermally induced viscosity-decreasing meshed protective film which comprises a PET (Polyethylene Terephthalate) film layer, a PE (Polyethylene) spraying film mesh layer, a silicone oil layer, a glue layer, a conductive layer and a PET base material layer which are arranged from top to bottom, wherein the glue layer is a modified polyacrylate glue layer. The protective film disclosed by the invention has a function of automatic dropping after heating and does not need to be stripped manually or by a robot. In addition, the protective film has a network structure, the mesh surface has an automatic exhaust effect during use, the protective film can be completely flushed, and residual glue is avoided after the film is stripped.

The invention relates to a device with temperature and humidity control capability and an adaptive control method thereof. The device comprises a fan, a gas-liquid heat exchanger, a semiconductor refrigeration chip, a condenser, a temperature and humidity sensor, a control device and an external liquid supply system. The device can control the start and stop or the rotational speed of the fan according to the air temperature feedback inside the space, can automatically adjust the air side air flow during the heat exchange process and controls the air outlet temperature, thereby controlling thetemperature in the space; according to the humidity feedback in the space, the start and stop of the semiconductor refrigeration chip is controlled to control the humidity in the space at a constantlevel; and in particular, the device combines the gas-liquid heat exchanger and a semiconductor dehumidifier, and the semiconductor dehumidifier adopts a liquid cooling and heat dissipation mode to avoid the defects that the use and the refrigeration of the fan of a traditional dehumidifier are greatly influenced by the ambient temperature; and moreover, the overall condensation caused by the traditional low-temperature water-liquid-liquid heat exchanger is avoided, and the reliability of the device and the environmental adaptability in the conditions without low-temperature water and with thelimited space are greatly improved.

The invention is applicable to the technical field of pasting equipment and provides a chip mounter, a pasting mounting correction device and a correction method thereof. The pasting mounting correction device comprises motion platforms and correction mechanisms, each motion platform is provided with a sheet stock containing part, at least three sliding grooves are formed in the periphery of the sheet stock containing part on each motion platform, and one end of each sliding groove is close to the corresponding sheet stock containing part. Each correction mechanism is provided with sliding blocks of the same number with that of the sliding grooves, and each sliding block can slide along the corresponding sliding groove in a reciprocating mode to conduct correction on sheet stock. After the correction is finished, second suction nozzles of the chip mounter suck up the sheet stock and paste the sheet stock onto a product. The chip mounter and the pasting mounting correction device have the advantages that the structure is simple, and the operation and maintenance are easy. The chip mounter can still finish chip pasting work even if the positional deviation of the sheet stock is large, the requirement of the chip mouter for the sheet stock is lowered, the use condition of the chip mounter is lowered, the application range is increased, the production efficiency is improved, and the production cost is lowered.

The invention is applicable to the field of robots, and provides a multi-axis industrial robot applicable to severe environments, which comprises a base, a support arm is mounted on the base, a swing arm is rotatably arranged on the support arm, an extension arm is slidably arranged in the swing arm, and the support arm and the swing arm are connected through a pulling assembly. The swing arm and the extension arm are connected through a pushing assembly, a spraying head is rotationally arranged at the end, away from the swing arm, of the extension arm, a rotating shaft of the spraying head is connected with the supporting arm through a horizontal maintaining assembly, and the pulling assembly is connected with a power assembly arranged on the base through a bevel gear set installed on the supporting arm. The power assembly is connected with a bearing disc arranged on the base through a third belt, a plurality of second vertical rods are arranged on the bearing disc, a bearing disc is arranged on the second vertical rods in a sliding mode, second springs are arranged on the second vertical rods in a sleeving mode, a clamping assembly is arranged between the bearing disc and the bearing disc, workpieces are clamped, and colored paint is evenly sprayed to the surfaces of the workpieces.

The invention discloses a startup preparation method of a hydrotreating device. The method is used for the starting process of the ex-situ prevulcanization type hydrotreating catalyst containing the thionyl compound. Especially in the airtight process, the constant-pressure heating section, the constant-pressure constant-temperature section and the constant-pressure heating section are arranged, so heat generated by hydrogenolysis of sulfide and / or auxiliaries in the airtight starting process is reasonably distributed and controlled, the phenomenon of centralized heat release is avoided, and the risks of over-temperature and temperature runaway are reduced. The method provided by the invention thoroughly solves the obstacles in the industrial application process of the catalyst, not only improves the use activity of the catalyst, but also eliminates the hidden danger of environmental protection caused by the leakage of the vulcanizing agent, and has a very good application prospect.

The invention discloses a split type ultrasonic precise distance measuring device. The device comprises a signal distance measuring device transmitting terminal and a receiving terminal, wherein the transmitting terminal comprises an input / output pin (1), a transmitting terminal central processing chip (3), an infrared transmitting tube (2) and an ultrasonic transmitting probe (4), the transmitting terminal central processing chip (3) controls the infrared transmitting tube (2) and the ultrasonic transmitting probe (4) to transmit signals simultaneously. The receiving terminal comprises a receiving terminal central processing chip (6), an ultrasonic receiving probe (5), a receiving terminal ultrasonic signal processing chip (7), an infrared receiving tube (8) and a signal input / output pin(9), data of the receiving end ultrasonic signal processing chip (7) and the infrared receiving tube (8) are processed by the receiving terminal central processing chip (6) and output by the signal input / output pin (9). The device avoids the limitation of measurement through barrier reflection during traditional distance measurement and has the advantages of being low in cost, easy to operate, precise in measurement and the like.

The invention discloses a particle shaping vacuum packing machine and belongs to the technical field of packing machines. The particle shaping vacuum packing machine comprises a packing body with a vacuum chamber, a packing bag is placed inside the vacuum chamber, the packing body is internally provided with a plurality of air bags used for performing vacuum packing on the packing bag, the vacuumchamber finishes vacuum pumping through an electromagnetic valve and a vacuum pump which are arranged inside the packing body, after vacuum pumping of the packing bag is finished through the vacuum pump, sealing of the packing bag is performed through a sealing device, the sealed packing bag is moved through a moving device, shaping and pressing are performed on the packing bag obtained after vacuum pumping and sealing through a pressing and shaping device, and air is pumped after pressing is finished. According to the particle shaping vacuum packing machine, an upward pushing air cylinder anda side pulling air cylinder are replaced through the air bags, shaping can be successfulat a time, the periphery of the packing bag is molded more rounded and is not prone to being damaged, noise isreduced, the packing rate is increased, the air bags are not prone to being affected by residues, the failure rate is lower, the service life is prolonged, and the air bags are easy to assemble and replace, the process is simplified, an external-connection air source is not needed, and the service condition is reduced.

The invention relates to a high refractive index evaporation material lanthanum titanate mixture and a preparation method thereof. The mixture is composed of La2Ti2O7 and La4Ti9O24 in a chemical formula. The preparation method thereof comprises the following steps: taking TiO2 and La(OH)3 as raw materials, and mixing to be uniform; carrying out an initial catalytic reaction at normal temperature, and obtaining the required shape by cold pressing or hot pressing; transferring a crucible filled with the obtained semi-finished product into a normal-pressure high-temperature furnace, and heating the furnace to 700-1300 DEG C for processing, thus the product is initially sized; and placing the semi-finished product into a vacuum sintering furnace, heating the whole system to 1400-1600 DEG C and vacuumizing, insulating for 2-4 hours, and cooling to obtain the lanthanum titanate mixture material. The preparation method has high production efficiency, manufacturing cost is low, and lanthanum titanate mixture in arbitrary shape can be prepared, the melting point of the prepared lanthanum titanate mixture is low, and the prepared lanthanum titanate mixture is easy to be melted and evaporated to form a stable optical coating.

The invention relates to the technical fields of chemical engineering and pharmacy, in particular to a preparation method for ipratropium bromide. The preparation method comprises the following stepsof using N-isopropylnortropine or N-isopropyl tropine as the raw material, and respectively performing methylation reaction with iodomethane, so as to obtain an iodine-containing compound; performingdeiodination reaction on the iodine-containing compound by special metal oxide, metal salt or bromine, and performing follow-up treating, so as to obtain the ipratropium bromide. The preparation method has the advantages that the storage and use condition of the methylation reagent raw material is greatly reduced, so that the transportation and storage cost of the raw material is reduced; comparedwith the bromomethane, the iodomethane has stronger reaction activity, and the reaction conditions are milder, so that the usage amount of the methylation reagent in the methylation reaction is reduced; the safety, operability and reaction effect of the original technology are enhanced by the preparation method, and the requirement on equipment is reduced.

The invention relates to a negative pressure fixing seat. The negative pressure fixing seat is suitable for medium-term and short-term fixation, cupping and pressure drug delivery on an irregular plane. The negative pressure fixing seat is provided with an annular base, wherein an annular sealing material is arranged in the annular base, the sealing material is one of a plastic deformation material, a mud plastic solid, a solid-liquid mixture and a fluid material, the surface of the sealing material is provided with 0-1 protective thin layer, and the annular base is integrally connected with anegative pressure shell plate or is in compressed connection with the negative pressure shell plate through a pressing ring. The negative pressure fixing seat has the advantages that the fixed load is large, the requirements on the use condition of the surface of the plane are low, the use condition of an original cupping device is lowered, the use functions and range of the original cupping device are increased, the cost is low, the fixation is firm, reinforcement can be performed in the middle, repeated use can be achieved, the fixation position is flexible, the surface of the fixed plane is not damaged, the fixing pressure is controllable, and the fixing time is long.

The invention discloses a check valve for preventing backflow. The check valve comprises a valve body, a spring seat, a spring, a check valve body, a valve element, a valve element base, a fluid inlet, a fluid outlet, a closing rod, a valve element base vent hole and a first-layer sealing ring, wherein the valve body comprises a cylindrical channel and the check valve body, the check valve body isa cylindrical cavity, and one end of the cylindrical channel is in seamless connection with one end of the cylindrical cavity; and the spring seat is arranged at the other end, connected with the other end of the cylindrical channel, of the cylindrical channel, the fluid inlet is formed in the outer part of the spring seat, and the middle of the spring seat is hollow and communicates with the fluid inlet. According to the check valve, a hydraulic system used in the traditional technology is replaced by the closing rod and the spring, and therefore the cost is reduced, the precision of the valve body is reduced, the use condition of the check valve is reduced, and the check valve can be suitable for more fields.

The invention discloses a valve with improved backflow resistance. The valve with improved backflow resistance comprises a valve body, a spring seat, a spring, a one-way valve body, a valve plug, a valve plug base, a fluid inlet, a fluid outlet, a closure rod, a valve plug base air hole and a first-layer sealing ring. The valve body comprises a cylindrical channel and the one-way valve body. The one-way valve body is a cylindrical chamber. One end of the cylindrical channel is in seamless connection with one end of the cylindrical chamber. The spring seat is arranged at the other end, not connected with the cylindrical channel, of the cylindrical chamber. The fluid inlet is arranged outside the spring seat. The spring seat is hollow in the middle and communicates with the fluid inlet. Themiddle part of the spring seat is hollow and in the shape of a circular truncated cone. The fluid outlet is formed in the other end, not connected with the cylindrical chamber, of the cylindrical channel. According to the valve with improved backflow resistance, because the closure rod and the spring are used instead of the hydraulic system used in the traditional technology, not only is the costreduced, but also the requirement on the accuracy of the valve body is reduced; and the requirements on the conditions for using a one-way valve are reduced, and therefore the one-way valve is applicable to more fields.

The invention discloses a 3D (three-dimensional) printing method of a building structural wall, comprising the steps of mixing waste concrete powder and waste brick powder, crushing, grinding, drying,adding cement, and mixing well to obtain a first material; mixing carbon nanotubes, castor oil and water, heating, stirring, drying by spraying, adding formic acid and petroleum ester, mixing well, adjusting temperature for stirring, dropwise adding phosphoric acid solution, continuing to perform stirring, dropwise adding hydrogen peroxide, stirring, filtering, drying, adding a water reducer, iron tailings, nano zirconia, gypsum, iolite and nano spherical iron oxide magnet powder, and mixing well to obtain a second material; adding, continuing to perform stirring while adding the first material, the second material and bismaleimide, continuing to perform stirring until a viscous slurry is obtained, transferring the slurry to a 3D printing system, and performing printing to obtain the building structural wall.

The invention relates to the field of computer vision, and discloses a binocular distance measurement method and system. The method disclosed by the invention comprises the steps of: shooting a to-be-measured real object by a binocular camera to obtain a first real object image and a second real object image; according to a precalculated zoom factor, carrying out focal length correction on the first real object image or the second real object image so a to reduce a focal length difference between the first real object image and the second real object image; and according to the first real object image and the second real object image which are obtained after focal length correction, calculating a distance from the to-be-measured real object to the binocular camera. According to the invention, before binocular distance measurement, by utilizing a focal length correction algorithm, images used for binocular distance measurement are processed to correct left and right images with different focal lengths originally and enable the focal lengths of the left and right images to be approximately consistent, so that when binocular distance measurement is carried out, a problem of inconsistent focal length of the camera does not need to be focused, thereby not only saving time and labor, but also enlarging an application environment of binocular distance measurement and reducing use conditions and an equipment threshold of binocular distance measurement.

The invention discloses a vacuum circulative radiating system for an electric driver of an electric vehicle. The vacuum circulative radiating system comprises two evaporators, a three-way electromagnetic valve, an intelligent control circuit, a condenser, a heat insulating layer, cold medium pipelines and a variable-speed compressor, wherein the heat absorbing surfaces of the evaporators are attached to a high-power heating device and formed in a carriage respectively; radiating surfaces of the two evaporators are attached to one side of the heat insulating layer; the other side of the heat insulating layer is contacted with the heat absorbing surface of the condenser; the cold medium pipelines are distributed between the heat insulating layer and the radiating surfaces of the evaporators; the three-way electromagnetic valve is connected between the variable-speed compressor and the cold medium pipelines; and the intelligent control circuit is connected with the variable-speed compressor and the three-way electromagnetic valve, and is used for adjusting the on / off of the cold medium pipelines on the evaporators respectively. By adopting the radiating system, radiating of the high-power heating device can be realized, the service conditions of components are lowered, and the service life of a product is prolonged; or the internal space of an automobile can be cooled simultaneously, and air conditioning and cooling effects are achieved.

The invention provides a security stamp. The security stamp comprises a stamp body (1) and a shell. The stamp body is contained in the shell. The lower portion of the shell comprises a bracket (1). The bracket comprises a retainer (3) and a positioning ring (4). The retainer (3) comprises at least two relatively-rotatable stamp rings (31 and 32). The positioning ring (4) is arranged between the two stamp rings (31 and 32). Convex-concave floral patterns (311 and 321) are correspondingly formed at the bottom end faces of the stamp rings. A complete ring-shaped security pattern is formed by the floral patterns of the at least two stamp rings. When the relative positions of the floral patterns are changed due to the relative rotation of the at least two stamp rings, the changing ring-shaped security pattern is generated. The invention further comprises a security stamp comparison system.

The invention discloses an underwater camera device with fill lights, comprising a line receiving device, cameras, fill lights, a turbine fan, a working component, an electric cylinder and a mechanical sealing ring. A conductive chain is wound around the line receiving device. A fixed connection frame is fixedly connected to the outer end of the conductive chain. A movable frame is connected to the outer side of a protective rod. A cleaning brush is installed on the lower side of the movable frame. A turbine fan is installed on the lower side of a device body. A fixed support plate is fixed tothe lower side of the turbine fan. The working component is installed inside the device body. The cameras and the fill lights are electrically connected to the upper side of the working component. According to the underwater camera device with the fill lights, the device body is provided with a plurality of cameras, and the fill lights are installed between the cameras so as to comprehensively display an environment around the device body and increase the light intensity of the underwater environment, thereby improving the quality of photography.

The invention discloses automatic welding equipment, and relates to the technical field of welding equipment. The automatic welding equipment comprises a barrel, and a driving cavity and a moving cavity are sequentially formed in the barrel from one end to the other end. Through mutual cooperation of a supporting driving motor, a threaded lead screw, a transmission sliding block, a transmission supporting ring and a supporting roller, the equipment can enter pipe fittings with different pipe diameters for inner girth welding, the influence of the depth of the pipe fittings is avoided, the use condition of the equipment is reduced, and the situation that the equipment cannot be used due to the large depth of the pipe fittings is avoided, so that the equipment is more practical and convenient to popularize; and through mutual cooperation of a displacement driving motor, a first double-groove belt pulley, a second double-groove belt pulley, a second lifting arm, a grooved roller and a second triangular belt, the equipment can be moved to a to-be-welded position, the situation that the welding effect is affected due to the fact that the equipment is unstable during welding is avoided, the quality of welding seams is improved, and the service life of the pipe fittings is prolonged.