806 results about "Fusion welding" patented technology

The invention discloses a steel structure three-dimensional workpiece welding seam identification and path planning method and system, and relates to the technical field of robot intelligent welding, and the method comprises the steps: building a multi-view fusion point cloud corresponding to a target workpiece; performing welding seam segmentation on the multi-view fusion point cloud by using a welding seam neighborhood point cloud segmentation model to obtain a multi-view fusion welding seam neighborhood point cloud; performing point cloud plane fitting on the multi-view fusion welding seam neighborhood point cloud to obtain a plurality of target welding seam neighborhood planes; and determining a corresponding welding seam straight line based on each pair of intersected target welding seam neighborhood planes, and identifying a welding path and a welding posture according to the welding seam straight line. The method provided by the invention shows good applicability under a complex background, has the advantages of automation, high efficiency, high recognition precision, strong adaptability and the like, and meets the intelligent and flexible operation requirements of the welding robot.

The invention relates to a top cover assembly and a tab welding method, at least two second connecting parts of a pole are arranged at intervals along the width direction of a cover plate, and tabs extending from at least two groups of battery cells in a battery cell assembly respectively correspond to the positions of the at least two second connecting parts. When the pole column and the battery cell assembly are welded, the tabs of the at least two groups of battery cells can be respectively welded with the tab welding surfaces of the at least two second connecting parts, so that an adapter plate is omitted, and the welding process is reduced. Moreover, due to the omission of an adapter plate, the first electrode and the second electrode can be adopted to apply pressure to the pole and the tab from the two sides respectively, so that the tab and the pole are welded in a pressure welding manner. Local heating is adopted in press fusion welding, the welding time is short, and welding slag is not generated in the welding process. Therefore, the top cover assembly and the tab welding method can ensure the quality of the battery on the premise of improving the assembly efficiency. In addition, the invention also provides a battery monomer, a battery and an electric device.

The contactor comprises an electromagnetic assembly, a static contact and a movable assembly, the movable assembly comprises a movable contact, a first elastic part and a driving part which are connected, and the first elastic part is configured to generate elastic force supporting the movable assembly; the driving component is configured to generate electromagnetic driving force through a magnetic field generated by the electromagnetic assembly, and the controller is configured to control a movable contact and a static contact of the movable assembly to be closed and respond to the fact that the sensor detects that the driving component generates displacement based on electric repulsive force generated by current flowing through the movable contact and the static contact. And controlling the electromagnetic assembly to adjust the generated magnetic field so as to reduce electromagnetic driving force which is generated by the driving part according to the generated magnetic field and is opposite to the electric repulsive force, so that the movable contact is not closed with the static contact again. According to the contactor disclosed by the invention, fusion welding of the movable contact and the static contact in the short circuit process can be prevented, so that the contactor fault is avoided, and the equipment reliability is improved.

The invention belongs to the technical field of fusion welding, and particularly relates to a method for planning multi-layer and multi-welding-seam welding parameters according to welding seam feature information, which comprises the following steps: 1) laser emitted by a 3D visual sensor is perpendicular to a welding seam and scans along the direction of the welding seam, and the 3D visual sensor scans welding seam data and transmits the data to a robot controller in real time; (2) the robot controller processes the weld joint data, the whole weld joint is subjected to multi-layer and multi-pass planning calculation, and the number of welding layers and the number of welding passes of each layer are planned; (3) the robot controller calculates the layer number and the channel number of a welding channel needing to be welded currently, a welding gun track coordinate set on a welding path and welding parameters corresponding to welding path points; and (4) the robot controller adjusts the welding track and the welding parameters in real time according to the step (1) to the step (3) in the current welding bead welding process, so that the purpose of multi-layer and multi-pass planning self-adaptive welding of the medium-thickness plate is achieved.

The invention belongs to the field of optical communication, and particularly discloses a hollow-core optical fiber connector and a manufacturing method thereof.The connector comprises a connecting piece, the connecting piece is fixedly installed at the end of a hollow-core optical fiber body, and an insertion hole for the hollow-core optical fiber body to penetrate through is formed in the connecting piece; and the plugging structure is arranged at one end of the connecting piece to physically plug the central channel of the hollow-core optical fiber body, and the plugging structure can allow optical signals transmitted in the central channel to pass through. Based on the structural design of the hollow-core optical fiber connector, butt joint of the two hollow-core optical fibers can be achieved by butt joint of the plugging structures on the two hollow-core optical fiber connectors, it is guaranteed that optical signals are transmitted in the two hollow-core optical fiber bodies, no special equipment needs to be adopted for fusion welding, the connection mode is simpler and more convenient, and the cost is lower. Meanwhile, due to the design of the plugging structure, the problem that water vapor and impurities enter the central channel of the hollow-core optical fiber body to affect optical signal transmission can be effectively avoided.

The invention provides a multi-sensor fusion welding temperature monitoring method and a related device, and the method comprises the steps: dividing a welding region into a plurality of sub-regions according to the spatial distribution of the welding region, and obtaining the initial temperature data corresponding to each sub-region according to various temperature sensors; performing time alignment on the initial temperature data through difference resampling of different sampling points to generate a time sequence temperature matrix; performing real-time quality detection on the time sequence temperature matrix to generate a real-time quality score, and performing weighted combination on the real-time quality score and a preset confidence coefficient parameter table to obtain a dynamic confidence coefficient result set; fusing the effective temperature data exceeding a preset confidence threshold in the dynamic confidence result set according to a fusion rule corresponding to each sub-region to obtain a fused temperature result; and the fusion temperature results of the sub-regions are subjected to time sequence splicing to obtain a global temperature curve of the welding process, so that the accuracy of temperature detection in the welding process can be effectively improved.

The utility model provides a fast closing circuit breaker, which comprises a contact mechanism, an operating mechanism and a limiting assembly, in the closing process, a moving contact has a first state in which the moving contact is linked with a moving contact frame and rotates towards a direction close to a static contact, and a second state in which the moving contact keeps a constant distance from the static contact after abutting against a limiting block and a first elastic piece stores energy; compared with the prior art, through the arrangement of the energy storage mechanism, the movable contact and the static contact can be quickly connected, the phenomenon that the contact is ablated or welded due to high temperature due to the fact that the contact is connected or disconnected due to human factors is avoided, and the safety of the contact is improved. And the service life of the circuit breaker is prolonged.

The invention relates to the technical field of nuclear fusion devices, and discloses a fusion device cooling pipe welding method and welding device.The fusion device cooling pipe welding method comprises the following steps that two cooling pipes to be welded are prepared; an adapter is welded to the welding face of one cooling pipe, and the nickel content of the adapter is higher than that of the cooling pipe; the radial interior of the adapter and the to-be-welded face of the adapter are polished; the two cooling pipes are assembled, so that the welding face of the other cooling pipe is in butt joint with the to-be-welded face of the adapter; and carrying out self-fusion welding on the adapter and the other cooling pipe. According to the welding method for the cooling pipe of the fusion device, the problem that the magnetic conductivity of the cooling pipe exceeds the standard is solved, and meanwhile the welding quality and the welding qualification rate of the cooling pipe are improved.

The invention relates to the technical field of angle valve manufacturing, in particular to angle valve welding equipment and a working method thereof. According to the equipment, through cooperative operation of the integrated assembling device, the welding device, the gas testing device and the transferring device, automatic assembling, rotary type all-round welding, multi-station circulating detection and closed-loop material circulation of the valve body piece and the connector piece are achieved; wherein the assembling device ensures that a connector piece precisely slides to a valve body piece connecting hole by utilizing the height difference design of a transition groove and a first guide groove, and the welding device rotates relative to a welding gun through a rotating seat to complete the full-circumference fusion welding of a seam between the valve body piece and the connector piece. The gas testing device drives the fixing assembly to circularly flow through the cooling station, the testing station and the discharging station through the rotating disc to achieve seamless connection of detection procedures, and the transferring device executes transverse and longitudinal composite motion to guarantee efficient transferring of materials among the procedures. The whole set of system forms a continuous production line, and the assembly precision, the welding sealing performance and the airtightness detection efficiency of welded finished products are remarkably improved.

The invention discloses a temperature sensing element for an aviation temperature sensor and a packaging method, and belongs to the technical field of aero-engine temperature detection.The temperature sensing element for the aviation temperature sensor comprises a shell, a cavity is formed in the shell in the axial direction, a step face is formed at one end of the cavity, and a plurality of shell through holes are formed in the step face; the platinum resistor unit comprises a ceramic column, a platinum wire wound on the periphery of the ceramic column and a leading-out wire welded with the platinum wire, the ceramic column is provided with an even number of through holes in the axial direction, and the leading-out wire penetrates through the through holes and then extends out of the cavity; the insulating tube is sleeved outside the outgoing line and is matched with the through hole of the shell; the end cover is arranged at the end where the step surface C of the shell is located and is in fusion welding sealing with the end surface of the shell; and the sheath is coaxially fixed at one end, opposite to the end cover, of the shell. The temperature sensing element can solve the technical problems of insulation degradation between the outgoing line and the shell of the existing temperature sensing element and lead series fatigue fracture failure.

The invention discloses a laser-assisted helium arc penetration fusion welding method, and belongs to the technical field of welding. The problems that according to an existing paraxial laser-electric arc composite structure, the welding track is difficult to control, the energy coupling efficiency is low due to laser energy loss, and weld joint partial melting and undercut defects are caused due to uneven distribution of a welding temperature field due to a generated asymmetric heat source are solved. The welding method comprises the steps of 1, pretreatment; 2, after being focused by a focus lens, the laser is divided into three laser beams through a spectroscope, then the three laser beams are converged again through a plurality of reflectors, three fan-shaped light spots are formed on the surface of the to-be-welded plate after convergence, and finally the focal plane position of the laser is adjusted to be located on the surface of the to-be-welded plate; 3, setting welding current and arc voltage; and fourthly, laser is used for assisting helium arc penetration fusion welding. The method is used for laser-assisted helium arc penetration fusion welding.

The invention discloses a multi-gear adjusting rotary switch, which comprises a base, a shell cover, a rotary handle and a contact assembly, and is characterized in that the rotary handle is rotationally arranged between the base and the shell cover and is provided with a driving rod extending along the radial direction of the rotary handle; the contact assembly comprises a plurality of moving contact bridges which are annularly arranged in the mounting cavity with the axis of the rotating handle as the center and are of elastic structures, and a plurality of static contact pieces which are arranged on the base and are opposite to the plurality of moving contact bridges, and the plurality of moving contact bridges are connected and are located on the moving path of the driving rod. According to the technical scheme, the driving rod drives the multiple movable contact bridges to make contact with the multiple static contact pieces in the process of rotating along with the rotating handle, operation pressure is remarkably dispersed through an in-turn contact mechanism formed by the driving rod and the multiple movable contact bridges, continuous stress of a single movable contact bridge is avoided, the mechanical load and the fatigue degree of the movable contact bridges are greatly reduced, and the service life of the movable contact bridges is prolonged. The heating probability is reduced, abrasion and fusion welding risks are reduced, and the mechanical service life is prolonged.

The invention provides a titanium alloy surface laser ultrasonic composite cleaning reinforced welding method, belongs to the technical field of non-ferrous metal surface cleaning and modification, and aims to solve the problems of poor welding seam quality and poor surface corrosion resistance, fatigue resistance and the like in the titanium alloy welding process. The cleanliness of the surfaces of components, welding grooves and the like is improved, and the production and machining efficiency is improved. In the fusion welding process, ultrasonic excitation of a high-energy beam is applied to the back face of a weld joint, the grain size of the weld joint is refined, the mechanical property of a connector is improved, rotating ultrasonic waves are applied to the surface of a component and the weld joint, the component and the surface of the weld joint generate plastic deformation, and the overall performance of the component and the surface of the weld joint is improved. The high temperature resistance, the corrosion resistance, the fatigue resistance and the like are improved.

The invention discloses a natural gas pipeline fusion welding seam crack nondestructive testing device, and relates to the technical field of welding seam crack detection. The device comprises a supporting frame, the interior of the supporting frame is semicircular, and an arc-shaped frame is fixedly connected to the interior of the supporting frame. According to the device, the stabilizing assembly and the detection assembly are arranged, the stabilizing assembly is shifted firstly, so that the supporting frame can be stabilized on the natural gas pipeline, the situation that the device deviates from the weld joint due to looseness in the detection process is reduced, then the detection assembly in the arc-shaped frame is started to operate, and an ultrasonic probe is driven to circularly detect the weld joint; through the operation, full-automatic detection of the weld joint of the natural gas pipeline is realized, a worker does not need to hold an ultrasonic instrument by hand to manually rotate along the weld joint of the pipeline, the detection efficiency is greatly improved, and the subjectivity and accuracy of a detection result are effectively improved; and the detection process is more convenient.

The invention discloses an underwater multi-wavelength composite laser welding deformation self-adaptive regulation and control device and method. The device comprises a control system, an underwater multi-wavelength composite laser welding system, a double-optical-fiber-semiconductor laser composite welding head and a deformation monitoring system. The method is characterized in that a double-fiber-semiconductor laser composite welding head outputs a laser beam to act on a weldment, a semiconductor short-wave laser large light spot preheats a material, an optical fiber long-wave laser performs underwater high-energy deep penetration welding, and the stability of a molten pool is enhanced through cooperation of the two. The control system controls the deformed curved surface by adaptively adjusting swinging parameters of the fiber lasers on the two sides, and the parameters are adjusted according to deformation of different degrees to ensure that the height of the deformed median surface is reduced. According to the method, the swing parameters of the optical fiber laser beams are adjusted through underwater multi-wavelength hybrid welding to change the energy distribution characteristics of the near-welding-seam area, real-time optimization of stress deformation in the welding process is achieved, and the problems that after an underwater laser welding structural part is welded, stress concentration and deformation are large, and the welding seam strength is insufficient are solved.

The invention belongs to the technical field of fusion welding, and particularly relates to a method for adaptively correcting the track of a welding robot and adjusting welding parameters, which comprises the following steps of: scanning a welding seam through a sensor to obtain a current welding seam section image; the robot controller processes the weld joint section image to obtain coordinates of a middle point of a bottom-layer gap of a weld joint butt joint position; in the welding process of the welding robot, the stored welding track coordinates are repeatedly matched, the track coordinate closest to the current position of the welding robot is found, and the coordinate is judged to be the actual position of a welding seam; the welding robot obtains X-axis offset, Y-axis offset and Z-axis offset according to the current coordinates of the movement position of the robot and the matched welding track coordinates, and the movement track of the robot is corrected through the DPM dynamic path correction technology; and the welding parameters of the welding robot in the swing welding process or the welding process are modified or adjusted in real time.

The invention relates to the technical field of laser welding, and provides a high-speed laser welding wire box process based on multi-beam synergy, which comprises the following steps: step 1, at least three laser beams are adopted as a synergy composite heat source, a main laser beam is responsible for penetration fusion welding, and an auxiliary laser beam is responsible for preheating, post-heating or molten pool stabilization; when the copper-aluminum dissimilar material is welded, an auxiliary laser beam is switched into a green laser; and 2, assembling a multi-beam optical regulation and control unit comprising a diffractive optical element, a quartz field lens and a galvanometer scanning module, splitting a main beam into one main beam and two auxiliary beams through the diffractive optical element, controlling focal depth fluctuation by the quartz field lens, and realizing accurate movement positioning of a laser beam by the galvanometer scanning module. Through integration of multi-beam collaborative design and an intelligent control unit, remarkable breakthroughs are achieved in the aspects of welding efficiency, quality consistency and process adaptability, firstly, in the aspect of efficiency and process, the welding speed is greatly increased, multi-station synchronous operation of an automatic welding unit is matched, and the welding period of a single-line box is remarkably shortened.

The invention relates to the technical field of welding, and discloses a press fusion welding joint movement fitting base device which comprises a first welding joint and a second welding joint, the first welding joint and the second welding joint are oppositely arranged, and a first protection device is arranged on the first welding joint; the first protection device comprises a top plate and a plurality of first protection plates arranged around the top plate, the top plate is suitable for penetrating through the first welding head, and the first protection plates form a first protection cavity; the first protection plate is rotationally connected to the top plate, the end, away from the top plate, of the first protection plate is obliquely arranged in the direction away from the first protection cavity, the first protection plate is connected with a first elastic piece, and the first elastic piece has damping force for damping deflection of the first protection plate in the direction away from the first protection cavity. By means of the first protection device on the first welding head, spark splashing and explosion points are protected during workpiece welding, and personal injury to workers caused by splashed sparks can be avoided.

The invention belongs to the technical field of non-woven materials and membrane separation, and particularly relates to a separation membrane supporting body with an interlocking structure and a preparation method thereof.The method comprises the steps that firstly, low-crystallinity and sulfonation-modified superfine polyester fibers are introduced into compact layer slurry, and framework polyester fibers and polyester heat bonding fibers are introduced into framework layer slurry; then forming a double-layer wet net by utilizing a double-flow-channel wet-process net forming device, applying gradient increasing negative pressure on one side of the skeleton layer, and enabling the superfine fibers to migrate from the compact layer to pores of the skeleton layer in a controlled manner by virtue of a viscous dragging effect of directional high-speed water flow on the superfine fibers, so as to form a gradient transition interlocking interface layer; finally, plastic deformation of the low-crystallinity fibers and fusion welding of the bonding fibers are utilized, an interlayer structure is locked through segmented hot pressing of a rough pressing section and a fine pressing section, and then cooling shaping is conducted. The prepared separation membrane support has the advantages of excellent interlayer peel strength, ultralow surface roughness, high air permeability, wide adaptability and high safety of the preparation process.

The invention discloses a silver-based tin oxide electric contact material and a preparation method thereof, and relates to the technical field of electric contact materials. When the silver-based tin oxide electric contact material is prepared, firstly, a high-temperature solid-phase method is used for doping lithium and cerium to prepare doped tin oxide powder; stannic chloride and copper nitrate are prepared into a fiber membrane through electrostatic spinning, meanwhile, titanium dioxide is grown in situ through nano spraying, and doped stannic oxide fibers are prepared after calcination; the doped tin oxide powder, doped tin oxide fibers and silver powder are subjected to high-energy ball milling and powder mixing and then annealed, and silver-based tin oxide composite powder is obtained; the silver-based tin oxide composite powder is subjected to pre-pressing forming and then subjected to vacuum discharge plasma sintering, and the silver-based tin oxide electric contact material is prepared. The prepared silver-based tin oxide electric contact material has the advantages of being low in resistivity, high in fusion welding resistance, good in arc erosion resistance and easy to machine and shape.

The invention provides a welding method of a box beam, a bogie frame and a railway vehicle. The welding method comprises the steps that the groove angle, the truncated edge length and the gap of a to-be-welded position are determined, and the dry extension length of a welding wire is determined; the angle of the groove is not higher than 45 degrees; sequentially forming a backing welding layer and a cosmetic welding layer at an outer side welding seam between the vertical plate and the lower cover plate through a deep penetration welding process; a cosmetic welding layer is formed at the inner side welding seam between the vertical plate and the lower cover plate through a deep penetration welding process, and a backing welding layer and a cosmetic welding layer are sequentially formed at the outer side welding seam; forming a backing weld layer and a cosmetic weld layer at the butt weld between the two vertical plates through a deep penetration welding process; the bogie frame is machined through the welding method, and the railway vehicle comprises the bogie frame. According to the welding method of the box beam, the bogie frame and the railway vehicle, the machining time can be saved, the assembling difficulty is reduced, raw material waste is avoided, and the welding efficiency and the welding seam quality are improved.

A circuit breaker provided by the present invention comprises a main loop and an arc-extinguishing conductive loop which are arranged in parallel, the main loop is provided with a moving contact and a static contact, the arc-extinguishing conductive loop is provided with a photoresistor, and when the moving contact and the static contact are broken due to a fault current to generate an electric arc, the resistance value of the photoresistor is reduced under the arc light effect of the electric arc. The arc-extinguishing conductive loop is in a conducting state, so that a fault current mainly passes through the arc-extinguishing conductive loop, namely the arc-extinguishing conductive loop plays a role in shunting, and the fault current flowing through the main loop is reduced, so that the arc ablation of the moving contact and the static contact is reduced, the energy of the arc is weakened, and the contact is not easy to have the conditions of fusion welding and ablation; when the moving contact and the static contact are completely disconnected, the electric arc is extinguished, the resistance value of the photoresistor is increased, and the arc-extinguishing conductive loop is in an open-circuit state, so that fault current is effectively cut off, the moving contact and the static contact are protected, and the service life of the circuit breaker is prolonged.

The invention discloses a laser welding method for titanium alloy. The laser welding method comprises pre-welding cleaning (acid pickling, polishing, laser cleaning and the like) of a titanium alloy part. By setting reasonable laser swing amplitude and frequency, laser power, defocusing amount, shielding gas flow and welding speed, the problems of deep penetration welding and pinhole effect of laser welding are solved, the porosity of a titanium alloy welding seam is reduced, and the mechanical property is improved. And the welding quality meets the requirements of QJ 20465-2016 I level.

The electric fusion welding machine comprises a welding machine body, a movable grip, an adjusting knob, heat dissipation fins and an input interface, the adjusting knob is installed in front of the welding machine body, a state display screen is arranged on the left side of the adjusting knob, the heat dissipation fins are arranged below the state display screen, and an output interface is arranged below the heat dissipation fins. An output interface is arranged in the welding machine body, a binding post is arranged in the output interface, a supporting spring column is arranged below the welding machine body, supporting spring wheels are installed on the supporting spring column, supporting spring blocks are installed on the supporting spring wheels, and heat dissipation fins are arranged on the two sides of the welding machine body. The spring plate structure has a good damping effect, the spring plate structure has a good bearing effect, and the L-shaped interface grip fixedly connected above the power supply connector is matched with the limiting head on the power supply connector, so that plugging and unplugging can be facilitated.

The invention discloses a method for determining the offset distance of a welding gun of a metal plate welding case lock bottom welding seam and a welding method, and belongs to the technical field of fusion welding technologies. The method for determining the offset distance of the welding gun comprises the steps that the machining side welding thickness L1, the metal plate side welding thickness L2 and the bottom locking thickness L3 of the metal plate welding case are obtained, and the axis offset P of a welding gun tungsten electrode and the center of a welding connector is calculated; based on the axis offset P, the opposite position of a welding gun tungsten electrode is determined, the offset angle theta over a welding bead and the diameter phi A of the welding bead are obtained, and the offset distance L between the opposite position of the welding gun tungsten electrode and the position over the welding bead is calculated; and based on the axis offset P of the welding gun tungsten electrode and the center of the welding joint and the offset distance L between the position right opposite to the welding gun tungsten electrode and the position right above the welding bead, the alignment position line of the tip end of the welding gun tungsten electrode is determined at the workpiece welding joint. The welding method comprises the steps that the position of the circumferential automatic welding gun mechanism is adjusted based on the alignment position line, and a welding gun is located in the welding bead upslope direction in the circumferential direction.

The invention discloses a construction method for prefabricating a concrete steel shell combined section in a factory, and relates to the technical field of bridge construction, and the construction method comprises the following steps: S1, manufacturing a wallboard unit; s2, the inner wall plate units are positioned, then the outer wall plate units are positioned, and then welding is conducted to manufacture steel shell segments; s3, annular structure concrete between the inner wall plate unit and the outer wall plate unit is poured, and steel shell concrete segments are formed; s4, secondary machining is conducted on the steel shell concrete segments; s5, vertical position continuous matching pre-assembly is carried out, after pre-assembly is completed, matching parts are installed, and marker lines are marked; s6, bridge site hoisting and positioning are conducted on the steel shell concrete sections; s7, outer wall plates of the steel shell concrete sections are subjected to butt-joint penetration welding, and then inner wall plates are welded; and S8, concrete pouring is conducted on bridge site ring openings of the steel shell concrete sections, and machining is completed. The technical problem that the construction period is prolonged due to prefabrication of the steel shell sections of the steel shell concrete tower in the prior art is solved.

The invention provides an automatic production line for collaborative operation of continuous vacuum laser deep penetration welding and workpiece surface oxidation pretreatment, and relates to the technical field of laser welding, the automatic production line comprises a grinding box, a laser processing box is arranged on one side of the grinding box, and inlets and outlets are formed in the two sides of the grinding box and the two sides of the laser processing box; a connecting channel is fixed to an inlet and outlet between the grinding box and the laser processing box, a sending-out channel is fixed to an inlet and outlet in the outer side of the laser processing box, and compared with the prior art, the grinding box communicates with the laser processing box through the connecting channel, and an extending-out plate and a containing plate for clamping plates are arranged in the connecting channel and the sending-out channel; the clamping distance suitable for plates can be adjusted through the conveying assembly, the plates are driven to be intermittently fed into the grinding box and the laser machining box in a clamping traction mode, air in the laser machining box is pumped out in cooperation with the air storage cylinder, the relative vacuum environment is kept, the effect of laser deep penetration welding is prevented from being affected, assembly line machining is achieved, and efficiency is higher.

The invention provides a method and a system for inhibiting an aluminum magnesium alloy laser deep penetration welding pore defect, and relates to the technical field of aluminum magnesium alloy laser welding, and the method comprises the following steps: S1, polishing the surface of an aluminum magnesium alloy welding plate, and carrying out chemical cleaning decontamination; s2, the aluminum-magnesium alloy welding plate is fixed through a welding tool, and the aluminum-magnesium alloy welding plate is restrained through a high-temperature clamp; s3, the aluminum-magnesium alloy welding plate is welded through double-light-spot laser, the front light spot is pretreated, and the rear light spot is subjected to deep penetration welding; s4, the scanning interval and the scanning width of the laser beams are adjusted and set through galvanometer parameters; and S5, the preset laser power, the preset welding speed and the preset shielding gas flow are adopted for completing laser welding. According to the method, high-quality welding of the medium-thickness plate aluminum alloy can be achieved.

The invention provides a multi-contact motor forward and reverse rotation control device. The multi-contact motor forward and reverse rotation control device structurally comprises a rotatable movable contact, an elastic telescopic rod, a sliding push rod and an electromagnetic assembly. The electromagnetic assembly serves as driving force to achieve rapid switching of the position of the movable contact so as to control forward and reverse rotation of the motor. The movable contact is designed to be sequentially connected with the fixed contact; and the sliding push rod is matched with a reciprocating boosting block on the back surface of the movable contact to realize rapid and stable movement of the movable contact. The device adopts a miniaturized design, is compact in structure, saves space, and is convenient to install and integrate into various electrical control systems. In addition, due to the scraping effect of the movable contact in the switching-on process, the fixed contact is automatically cleaned, contact fusion welding is effectively prevented, and the safety of the system is enhanced. The device is simple in structure, low in maintenance cost, easy to disassemble and maintain, capable of ensuring safe disconnection even under the condition that the reset spring fails, and suitable for wide industrial automation application.

The utility model relates to an optical fiber welding protection tube. The optical fiber welding protection tube comprises a heat shrink tube, a hot melting tube and a supporting tube, the periphery of the supporting tube is sleeved with the hot melting tube, the periphery of the hot melting tube is sleeved with the heat shrink tube, and a plurality of liquid injection through holes are formed in the supporting tube. Compared with an optical fiber fusion welding protection tube in the prior art, the supporting tube in the optical fiber fusion welding protection tube is like a protection cage, an exclusive space is provided for the optical fiber, only flowing liquid substances are allowed to enter the exclusive space, the protection cage can protect damage from any direction in 360 degrees of the circumference, and the optical fiber fusion welding protection tube has the advantages of being simple in structure and convenient to use. And more reliable and more symmetrical supporting and protecting performance is achieved. Meanwhile, when the heat shrink tube is heated and shrunk, the heat shrink tube only wraps the outer side of the supporting tube, pressure cannot be directly conducted to the optical fiber, and the optical fiber is prevented from being bent and fractured. Compared with the scheme of a thinner supporting rod and a flat sheet in the prior art, the distributed supporting tubes are used for protecting the optical fiber on the periphery of the optical fiber, and the size after welding is smaller.