4162results about "Tubular articles" patented technology

The invention discloses a multi-mechanical-arm space-time synchronization control method for coiled pipe welding, and belongs to the technical field of automation control, and the method comprises the steps: in a primary laser and TIG hybrid welding execution stage, carrying out real-time data acquisition on a welding area of a workpiece, carrying out real-time deviation detection, and once real-time welding deviation is detected, carrying out time-space synchronization on the welding area of the workpiece; a local correction mechanism is triggered immediately, and deviation is prevented from being accumulated in the single welding process; after one-time welding is completed, the workpiece enters a transition area, global contour reconstruction is conducted on a welded section of the workpiece through three-dimensional scanning equipment, global deviation recognition is conducted, and unprocessed hysteresis deformation and accumulative errors are covered and corrected in real time; on the basis of the analysis result of the global deviation recognition, double correction is conducted on secondary welding, and cooperative control over space track correction and technological parameter adaptation is achieved; and after secondary welding is completed, the correction effect is evaluated through a double-layer evaluation mechanism, and the stability of the correction process is ensured.

The invention provides an intelligent pipeline welding method and system based on data decision, and relates to the technical field of intelligent pipeline welding.The intelligent pipeline welding method comprises the steps that a welding request is responded, a groove image of a to-be-welded pipeline is obtained through an active visual sensor, groove morphology characteristic parameters of the to-be-welded pipeline are determined based on the groove image, and the to-be-welded pipeline is welded according to the groove morphology characteristic parameters. Based on the groove morphology characteristic parameters, corresponding basic layer channel arrangement rules and reference process parameters are determined from a preset layer channel arrangement database, a welding process scheme matched with the current groove is generated in combination with the groove morphology characteristic parameters, and the current groove is welded on the basis of the welding process scheme. And the welding operation is executed in the groove of the to-be-welded pipeline, the technical problems that in the prior art, the global planning capacity is deficient, the deviation correction strategy is locally lagged, and the whole-process accurate control is insufficient are solved, and the effect of improving the stability and reliability of the welding quality of the pipeline is achieved.

The invention discloses an automatic plastic pipeline winding machine, and relates to the field of plastic pipeline production, the automatic plastic pipeline winding machine comprises a mold driving mechanism, a winding mold pipe and a formed plastic pipe conveying mechanism, the mold driving mechanism comprises a base, a sliding bottom plate and roller carriers, the sliding bottom plate is slidably mounted on the base, and multiple groups of roller carriers are mounted on the sliding bottom plate at intervals; the winding mold pipe is arranged on the roller frame, a cooling pipe is fixedly installed in the winding mold pipe, a plurality of independent cooling cavities are formed between the inner wall and the outer wall of the winding mold pipe in the axial direction of the winding mold pipe, each cooling cavity is provided with an air inlet hose, and the two ends of each air inlet hose are connected with the corresponding cooling pipe and the inner wall of the winding mold pipe correspondingly; the heating mechanism comprises a flame gun installed towards the winding die pipe, the formed plastic pipe conveying mechanism is used for conveying a material belt to the winding die pipe and conveying a plastic pipe to the wound material belt, on one hand, the shrinkage pulling force generated by later cooling is reduced, and on the other hand, the winding coverage area of the front and rear material belts is reduced.

The invention belongs to the technical field of 3PE corrosion prevention, and particularly relates to a high-temperature-resistant and cathodic disbonding-resistant 3PE corrosion-resistant pipeline and a preparation method thereof. A pipeline epoxy bottom layer, a middle adhesive layer and a polyethylene surface layer are subjected to systematic chemical synergistic modification, specifically, the epoxy bottom layer is modified with phenolic resin and amino silane, and a heat-resistant compact barrier is formed; the middle layer reacts with maleic anhydride grafted polyethylene through amino silane to construct a chemical bridge for simultaneously connecting the upper layer and the lower layer; the surface layer is grafted with high-density polyethylene through fluoroprimary amine modified glycidyl methacrylate, and a hydrophobic and oleophobic chain and a reactive functional group are introduced; according to the structure, through the synergistic effect of the high-temperature stability of the bottom layer, the two-way chemical bridging capacity of the middle layer and the inert hydrophobic characteristic of the surface layer, the long-term use temperature upper limit, the stripping resistance and the medium infiltration resistance of the pipeline are improved, and a solution is provided for long-term protection of the pipeline in the severe environment.

The invention discloses a refrigeration pipe welding positioning method and device. The method comprises the following steps that S1, branch pipes are placed in all storage boxes; s2, the main pipeline is placed in a matching groove of the supporting frame, and the main pipeline is fixed through cooperation with a pressing ring; s3, a third electric cylinder is started, the third electric cylinder drives a supporting frame and the main pipeline to move to be close to the welding gun, and a branch pipe of the main pipeline moves to cross the welding gun; s4, a first electric cylinder is started, and the first electric cylinder drives a synchronous plate and an ejector sleeve to move; the motor, the first chain wheel, the second chain wheel, the chain and the hollow rotating disc are matched to drive the vortex line groove and linear groove linkage adjusting block and the rolling wheel to move, the purposes of clamping positioning and circle center correction of the branch pipe are achieved, the branch pipe is corrected to the position concentric with the disc, the coaxiality of the branch pipe and a main pipeline branch pipe is guaranteed, and the machining efficiency is improved. And the quality problems of insufficient welding, welding skips, poor welding seam forming and the like caused by positioning deviation are avoided.

The invention discloses a high-strength composite pipe manufacturing method, and relates to the technical field of composite pipe production, and the method comprises the following steps: S1, inner ring welding: arranging and guiding inner ring reinforcing warps through a front end winding welding seat, and welding inner ring spiral wefts to the outer sides of the inner ring reinforcing warps through electric sparks, s2, mesh belt winding: wrapping a middle-layer steel wire mesh belt on the outer side of an inner-ring spiral weft through a middle-layer mesh belt winding welding seat, welding the middle-layer steel wire mesh belt on the outer side of the inner-ring spiral weft through electric sparks, and winding the middle-layer steel wire mesh belt on the outer side of the inner-ring spiral weft through a middle-layer steel wire mesh belt winding welding seat; the operation stability of production equipment is improved, the convenience of replacement and adjustment of the mesh belt storage roller is effectively improved, a mesh framework is formed by continuous online welding of warp-direction steel wires and inner and outer weft-direction steel wires, and the mesh framework and steel-plastic formed by one-time co-extrusion composite molding of polyethylene plastic penetrate through each other in a three-dimensional mode and are embedded with each other to jointly bear the working load.

The invention discloses a welding device for flange plate machining, and relates to the technical field of welding devices. Comprising an operation table, a plurality of first supporting plates are arranged on the inner wall of a pipeline at equal angles, an inner supporting assembly is arranged on one side of a base, a supporting assembly is arranged on one side of the inner supporting assembly, a plurality of second supporting plates are arranged on the inner wall of a flange at equal angles, an adjusting assembly is arranged on one side of a welding gun, and an abutting assembly is arranged on one side of the flange. By arranging the moving ring, the rolling wheels, the rotating rod and other structures, when the moving ring moves, the rolling wheels in the moving ring are driven to move, and then the rotating rod is driven to rotate, the rotating rod is fixedly connected with the telescopic plate through the connecting shaft, so that the telescopic plate is driven to rotate, and then the angle of the welding gun is adjusted; the angle of the welding gun is changed in a self-adaptive mode through different pipeline wall thicknesses, the weld penetration performance is guaranteed, incomplete penetration or incomplete fusion is avoided, weld forming is optimized, and geometric accuracy is guaranteed.

The utility model relates to the technical field of welding devices, and discloses a thin-wall copper pipe welding device which comprises a working table, the top of the working table is fixedly connected with a welding frame, the side wall of the working table is fixedly connected with a first servo motor, the output end of the first servo motor is fixedly connected with a first threaded rod, and the output end of the first threaded rod is fixedly connected with a second threaded rod. The outer surface of the first threaded rod is in threaded connection with a moving block, the top of the moving block is fixedly connected with a moving plate, and the side wall of the moving plate is fixedly connected with a second servo motor. According to the pipeline welding part polishing device, through the buffer block, the connecting rod, the stabilizing frame, the reset spring and the polishing block, the stabilizing frame is used for supporting a welding part, meanwhile, the polishing block is used for polishing the welding part of a pipeline, and the situation that workers are injured in the taking process due to the fact that the welding part is inconvenient to polish is avoided; and the working efficiency of the welding device is improved.

A method for manufacturing tubular packaging by welding a tubular body (2) to a component (3), e.g. a cap or a base, said method comprising the following steps: A. Feeding with a component (3); B. Feeding with a tubular body (2); C. Heating (12) the interface to be welded (14, 14') of the component (3) and the tubular body (2); D. Positioning the areas to be welded (14, 14'); E. Pressurizing (18) and cooling (19) the weld (21); in which the method, during the heating of the interface (14), is actively cooled (11) the external face (9) of the tubular body (2) during step C, the surface layer (9) of the tubular body (2) does not flow during step E and a bead (22) of material from the tubular body (2) is formed at the end of the surface layer (9).

The invention relates to the technical field of composite pipe machining equipment, and provides a winding device and technology for large-diameter water supply pipe production, the winding device is used for winding a glass fiber belt on the outer wall of a pipe body, the winding device comprises a rack, a moving platform, a pressing wheel and a hot air pipe, the pipe body is rotationally arranged on the rack, the moving platform is movably arranged on the rack, and the hot air pipe is arranged on the rack. The moving platform is located on one side of the pipe body, the moving direction of the moving platform is parallel to the rotating axial direction of the pipe body, the pressing wheel is rotationally arranged on the moving platform and is opposite to the rotating direction of the pipe body, the glass fiber belt is coated with bonding materials, a gap is reserved between the pressing wheel and the pipe body so that the glass fiber belt can penetrate through, and the hot air pipe is arranged on the moving platform and is provided with an air outlet facing the gap. The air outlet is used for outputting hot air hot melting bonding materials to be matched with the pressing wheel to extrude the glass fiber belt to be bonded to the outer wall of the pipe body. According to the winding device, through the pressing wheel and the hot air pipe, stable bonding of the glass fiber belt is achieved, and the technical problem that in the prior art, bonding of glass fibers and a PE pipe body is difficult is solved.

The invention relates to the technical field of basalt fiber reinforced composite material pipelines and preparation methods thereof, and discloses a pipeline named as a basalt fiber reinforced composite material pipeline and a preparation method thereof and a preparation method thereof. The invention aims to overcome the defects of continuity, interface bonding and mechanical properties of the conventional basalt fiber reinforced composite material pipeline. The pipeline is composed of a lining layer, a basalt fiber winding reinforcing layer and an outer protective layer, the reinforcing layer is formed by compounding basalt fiber bundles subjected to surface treatment and a resin matrix, and the reinforcing layer is of a multi-layer structure with different winding angles. The preparation method comprises the following steps: roughening the inner lining layer, infiltrating and accurately winding the fiber bundles, performing multi-section curing and forming the outer protective layer. According to the scheme, the macroscopic mechanical property of the pipeline is remarkably improved, the interface combination of fibers and a matrix is optimized, the integrity of the fibers is kept, efficient preparation is achieved, and the pipeline has the advantages of being excellent in corrosion resistance and ultraviolet resistance, long in service life and the like.

The invention provides a pipeline welding method and system fusing teleoperation teaching and visual recognition. The method comprises the steps that discrete key point positions in a pipeline welding seam path picked up by teleoperation equipment teaching are obtained; generating an initial welding track by using a track interpolation method based on the key point location; a guide point is generated based on three-dimensional contour data, collected when a line laser contour sensor scans along the initial welding track, of an actual pipeline welding seam; the deviation value between the guide point and a corresponding track point on the initial welding track is obtained, and the initial welding track is compensated and corrected according to the deviation value to generate an actual welding track; and the welding robot is controlled to execute multi-layer welding operation along the actual welding track. According to the method, the experience of people and the precision of laser vision are combined, the planning efficiency and the track precision of the welding path are remarkably improved, and the welding quality and the operation safety of the pipeline under the severe working condition are guaranteed.

The utility model relates to the technical field of pipe molds, in particular to a core power supply pipe extrusion mold which comprises a mold body, a heat-resistant wire, a core mounting seat and an in-pipe monitoring assembly arranged in the core mounting seat, and the core mounting seat is connected with the mold body; a power supply input end is arranged on the mold body, a power utilization output end electrically connected with the in-pipe monitoring assembly is arranged in the core part mounting seat, the heat-resistant wire penetrates through the mold body, and the power supply input end is electrically connected with the power utilization output end through the heat-resistant wire. According to the utility model, long-term stable electric energy supply is provided for quality detection equipment arranged at the core part of the pipe.

The invention discloses a pipe welder online inner crator and burr removing equipment device, and relates to the technical field of steel pipe welding, the pipe welder online inner crator and burr removing equipment device comprises a fixing frame, two sliding rails are symmetrically and fixedly mounted at the top of the fixing frame, a plurality of mounting frames and moving frames are slidably mounted at the tops of the two sliding rails respectively, and the mounting frames and the sliding rails are fixed through bolts; and a feeding mechanism, a delivery mechanism and a conveying mechanism are arranged on one side of each of the multiple mounting frames and the movable frame. A second air cylinder, a lead screw and a crank of the high-pressure inner burr blowing mechanism can adjust the position of an air nozzle body, adapt to steel pipes of different specifications and cooperate with a first air cylinder and a lower pressing plate to achieve stable positioning, and inner burrs are efficiently removed; a fourth motor, a sixth gear and a rack of the driving mechanism drive a moving frame to slide along a sliding rail to flexibly adapt to steel pipes with different lengths; a first gear, a second gear and a third gear of the delivery mechanism are linked to drive a first clamping piece on a moving plate to synchronously transfer multiple sets of steel pipes, and it is guaranteed that the rhythms of all procedures are matched.

The invention discloses a movable steel pipe fitting welding device for road and bridge construction, and particularly relates to the technical field of welding devices.The movable steel pipe fitting welding device comprises a welding moving trolley, a fixing assembly is arranged in the middle of the upper end of the welding moving trolley, a driving assembly is arranged in the fixing assembly, and a welding assembly is arranged on the rear side of the driving assembly; alignment assemblies are arranged in the middles of the front side and the rear side of the fixing assembly. Through cooperation of a first friction wheel, a second friction wheel and different one-way rotating shafts, position exchange of an upper cleaning structure and a lower cleaning structure is achieved, it is guaranteed that slag removal operation can be conducted immediately after welding is continuously conducted in the two directions, and through meshing cooperation of a second gear and an arc-shaped gear ring, a welding head is driven to annularly move around a steel pipe along an arc-shaped guide rail; and similarly, the pneumatic chipping hammer, the grinding machine and the steel wire brush are matched to ensure that each layer is cleaned immediately after being welded, and critical defects such as incomplete fusion and slag inclusion among the layers are reduced.

The invention discloses a main pipe assembly based on double-layer synchronous weaving and a manufacturing method, a construction method and a system of the main pipe assembly, and belongs to the technical field of pipeline trenchless repair. The main pipe assembly comprises a sealing rubber pipe and an outer-layer belt blank, and the sealing rubber pipe is composed of a fiber inner-layer belt blank which is woven in a twill mode and provided with groove-shaped textures on the inner surface and a sealing layer bonded through an extrusion technology. The outer-layer belt blank is arranged on the outer side of the sealing rubber pipe in a sleeving mode and can be separated, and a cavity for containing resin is formed. The manufacturing method comprises the following steps: synchronously weaving an inner-layer strip billet and an outer-layer strip billet through a double-layer strip billet circular weaving machine, performing dynamic tension control, extruding a sealing layer on the inner surface of the inner-layer strip billet, performing composite cooling and rolling to manufacture the dry pipe assembly, and defining weaving parameters, extrusion conditions and cooling requirements. When the pipeline is repaired, the dry pipe assembly is firmly bonded with the inner wall of the pipeline through unwinding, glue injection, glue pressing, dragging into the to-be-repaired pipeline, pressurized attachment and curing. The method improves the bonding stability and construction efficiency of the sealing layer, and is suitable for the field of pipeline repair.

The invention relates to the technical field of welding, and discloses a numerical control welding device for special-shaped seams, which comprises a welding table, the welding table is rotatably connected with a turntable, the turntable is fixedly provided with a limiting seat, the limiting seat is provided with a flange pipe, and the limiting seat is slidably connected with a T-shaped abutting block and two L-shaped limiting blocks. A movable mechanical clamping jaw is arranged above the rotary disc, a branch pipe is clamped on the mechanical clamping jaw, a mechanical arm is fixed to the welding table, and a welding gun is installed on the mechanical arm. Movable sliding seats are arranged on the two sides of the limiting seat, tooth blocks are rotationally connected to the sliding seats, and arc-shaped cleaning seats are fixed to one ends of the tooth blocks, so that the circle center of a branch pipe and the circle center of an opening of a flange pipe can be conveniently located on the same straight line, the positioning accuracy can be improved, and the defects of weld joint dislocation, incomplete fusion or undercut are prevented. And therefore, the welding precision and quality are improved.

The invention relates to a rotary indexing device for the manufacture of packaging tubes comprising an indexed turret (1) having an axis of rotation (2) and comprising at least a first track (A) and a second track (B), each track (A, B) comprising mandrels (3A, 3B) arranged on the circumference of the indexed turret (1); the mandrels (3A, 3B) operating successively with stations (4A, 4B); the axis (2) of rotation of the turret (1) being horizontal, and the tracks (A, B) having a spacing (7) from one to the other along the axis of rotation (2) of the turret (1) and a misalignment (6) in the plane of rotation of the turret (1), said misalignment (6) making visible all the stations (4A,4B) and the chucks (3A,3B) and said spacing (7) allowing to minimize the rotational inertia of said turret (1).

The present invention relates to a method for producing a laminate, wherein the laminate is obtained by integrally laminating an expanded beads molded article (a) composed of expanded beads A and having interconnected voids and an expanded beads molded article (b) composed of expanded particles B and having interconnected voids, the difference [Pb−Pa] between the voidage (Pa) of the expanded beads molded article (a) and the voidage (Pb) of the expanded beads molded article (b) is 5% or more, and the expanded beads A and the expanded beads B satisfy the following (1) to (3): (1) a difference [dB−dA] between an average hole diameter (dA) of the through-holes of the expanded beads (A) and an average hole diameter (dB) of the through-holes of the expanded beads (B) is 0.3 mm or more and 2 mm or less; (2) the expanded beads (B) have an average outer diameter DB of 3.5 mm or more and 5 mm or less; (3) a difference [DB−DA] between an average outer diameter DA of the expanded beads (A) and an average outer diameter DB of the expanded beads (B) is −0.3 mm or more and 2 mm or less.

The invention discloses a recycled modified polypropylene composite material preparation system and a resource recovery method, and relates to the technical field of high polymer material science and engineering. The raw material pretreatment module adopts near infrared spectrum classification, multi-stage cleaning, drying and crushing, and the moisture content is controlled to be less than 0.5%; the melt blending module melts the materials at 180-220 DEG C, modifiers and additives are added, and vacuum degassing is performed to remove impurities; adding a reinforcing agent into the modification reinforcing module, and performing ultrasonic dispersion and dynamic vulcanization; the molding processing module is used for manufacturing a product through extrusion, injection molding or calendaring; the quality detection module is used for detecting mechanical and thermal properties; the waste recovery module is used for crushing and melting granulation to realize a closed loop; the intelligent control module uses a PLC to coordinate each module. Integrated treatment of waste polypropylene is achieved, the purity of raw materials and the performance of a composite material are improved, the resource utilization rate is increased through closed-loop recycling, manual intervention is reduced through intelligent control, product stability is guaranteed, economic and environment-friendly benefits are achieved, and high-valued circulation of waste plastic is promoted.

The invention discloses a steel structure butt welding adjusting device which comprises a supporting plate and supporting rods fixed to the four corners of the bottom of the supporting plate. A grinding part is arranged in the butt joint mechanism, in the butt joint process of the two steel structure bodies, the grinding part can make contact with the steel structure bodies along with continuous movement of a driving part, the grinding part comprises a coarse grinding plate, a fine grinding plate and a polishing plate, in the grinding process, a sliding plate slides on the top of a supporting plate along with a mounting plate driven by the driving part to move, and the grinding plate is in contact with the grinding part. The rough grinding plate firstly makes contact with the rotating steel structure main body and conducts comprehensive rough grinding on the end face of the steel structure main body through rotation of the steel structure main body, and due to the fact that a second gear at the bottom of a lead screw is meshed with a second rack at the bottom of a mounting shell, the lead screw can rotate, and therefore when a grinding piece moves to a certain degree, the grinding piece can rotate. And the rough grinding plate, the fine grinding plate and the polishing plate can sequentially treat the steel structure body and then move downwards into the second mounting frame.

The invention discloses steel pipe laser cutting equipment, and relates to the technical field of copper pipe cutting. The steel pipe laser cutting equipment comprises a cutting table, a pipeline positioning block is assembled in the cutting table, and the interior of the cutting table is rotationally connected with a lead screw driven by a servo motor; and the moving table penetrates through the cutting table, and the moving table and the cutting table are in a sliding connection state. According to the steel pipe laser cutting equipment, when a steel pipe needs to be rapidly cut, a lead screw driven by a servo motor rapidly rotates to drive a moving table and a laser cutter to rapidly move, and a first hydraulic bin, a first spring, a sliding block, a first transmission plate, a second hydraulic bin, a first stress rod, a first transmission rod, a second spring, a pressing plate, a third spring and a first stress plate are matched; under the condition, the supporting effect of the device on the inner wall of the steel pipe is improved, the possibility that the steel pipe shakes is reduced, and the cutting effect of the device is improved.

The invention relates to a municipal heat distribution pipeline welding positioning device and method, and relates to the technical field of pipeline welding auxiliary equipment. Comprising a positioning frame, the positioning frame comprises a base and a fixing seat, the fixing seat comprises two n-shaped frames, and the two n-shaped frames are connected through a supporting rod. The positioning frame is provided with a clamping unit for positioning and fixing a pipeline; and the synchronization unit facilitates cooperative work of a plurality of positioning frames. According to the pipeline welding assisting device, the following problems existing in the pipeline welding assisting process in the prior art can be solved: the matching blocks of the synchronization units can horizontally rotate, the horizontal included angle between the multiple positioning frames can be flexibly changed in combination with height adjustment of the multi-stage telescopic rods, and the design trend of a bent pipe is accurately reproduced; the problem that a traditional device lacks a bent pipe angle adjusting and fixing mechanism is solved. And through synchronous adjustment of a first clamping jaw, a second clamping jaw and a third clamping jaw in the clamping unit, automatic centering of the pipelines is achieved, and it is guaranteed that the coaxiality of the two pipelines is consistent with the distance of the welding position.

The invention relates to the technical field of pipe fitting assembling tools, and discloses a ship pipe fitting assembling and welding tool which comprises a welding table, moving seats are movably connected to the two sides of the upper end of the welding table in a sliding mode, and bottom supporting assemblies used for containing to-be-welded pipe fittings and outer side clamping assemblies engaged with the bottom supporting assemblies are arranged on the moving seats; an inner side clamping assembly is installed at the outer side end of the bottom supporting assembly through a support assembly, and a buffering assembly is further arranged on the support assembly. Through the structural design of'self-weight triggering linkage clamping 'and the synergistic effect of the bottom supporting assembly, the outer side clamping assembly and the inner side clamping assembly, a positioning structure of'inner supporting and outer clamping' is formed, it is guaranteed that the inner wall and the outer wall of a pipe fitting are synchronously positioned, the coaxiality of the pipe fitting can be effectively guaranteed, radial deviation in the welding process is avoided, the repair rate is remarkably reduced, and the welding quality is improved. According to the pipe fitting clamping device, a pipe fitting only needs to be placed on the supporting rollers, full-process linkage clamping can be triggered through self weight, and complex manual operation is not needed.

The invention relates to welding equipment for oil pipe machining and a manufacturing process, and belongs to the technical field of welding. The device comprises a rack, an annular rail, a walking vehicle, an arc-shaped rail, a support and a welding gun clamping seat, a positioning mechanism used for keeping coaxial butt joint of two oil pipes to be welded is arranged on the rack, and the axis of the annular rail extends leftwards and rightwards and is used for being fixedly arranged on the outer side of one oil pipe in a sleeving mode; the walking vehicle is slidably installed on the annular track in the extending direction of the annular track, the arc-shaped track is connected to the walking vehicle, the plane where the arc-shaped track is located is perpendicular to the radius of an oil pipe to be welded, and an arc-shaped opening of the arc-shaped track faces a weld joint. The welding gun clamping base can be movably installed on the support in the radius direction of the arc-shaped rail, and a third walking driving structure used for driving the welding gun clamping base to move in a reciprocating mode is arranged between the support and the welding gun clamping base. The stability of the oil pipe weldment can be improved.

The embodiment of the invention provides a plastic-coated steel pipe and a plastic coating process thereof, and relates to the technical field of plastic-coated steel pipes. The plastic-coated steel pipe comprises a steel pipe base body, a metal transition layer, an inner anticorrosive coating, a fiber reinforced winding layer and an outer protective coating are sequentially arranged on the outer surface of the steel pipe base body from inside to outside, and the metal transition layer is a nickel-chromium-aluminum-yttrium alloy layer and is formed on the surface of the steel pipe base body through a supersonic plasma spraying process. And the inner anticorrosive coating is formed by a mixture of bisphenol F type epoxy resin and novolac epoxy resin, and is doped with silicon nitride and zirconium oxide composite nanoparticles subjected to surface treatment. By arranging a multi-stage composite structure of the metal transition layer, the high-temperature-resistant anti-corrosion coating, the fiber reinforcement layer and the self-repairing outer layer and arranging the detachable heat insulation sheath, the interface bonding strength, heat resistance, mechanical damage resistance and corrosion resistance of the plastic-coated steel pipe are improved; and the service life of the composite material in high-temperature, strong-corrosion and complex construction environments is effectively prolonged.

The invention relates to the technical field of composite materials, in particular to a large-length-diameter-ratio composite pipe fitting forming method which comprises the steps of S1, core mold splicing, S2, air pipe sleeving, S3, paving and winding, S4, core mold dissolving, S5, sealing and depoling, S6, flange mounting, S7, mold closing and bag making and S8, heating and curing. Wrapping the hot melt adhesive at the bonding position by using an aluminum foil adhesive tape, then removing the aluminum foil adhesive tape, sleeving the bonded core mold by using a release air pipe longer than the core mold, pouring acetone into the release air pipe, dissolving the EPS foam rod, completely sealing the inlet end of the release air pipe, and finally sealing the release air pipe. And the sealed release air pipe is pulled out of the pipe fitting prefabricated body, the pipe fitting prefabricated body is obtained, and then the composite pipe fitting is manufactured in cooperation with a female die and a bag. The technical problem that the large-length-diameter-ratio composite pipe fitting with the perfect inner surface effect and the perfect outer surface effect cannot be manufactured through an existing technology on the premise that the mechanical property of a product is guaranteed is solved.

The utility model relates to the technical field of steel pipe welding, in particular to a submerged arc welding machine for steel pipe straight seam welding, which comprises a steel pipe placing seat, a welding mechanism arranged on the rear side of the steel pipe placing seat, and a welding flux recovery mechanism comprising a recovery cover positioned on the upper side of the steel pipe placing seat. And a scraping plate for removing slag shells is fixed at the bottom of the inner wall of the recovery cover. A supporting plate in the welding mechanism drives a welding flux box, a welding gun and a welding flux recovery mechanism to move synchronously, slag shells formed by the welding flux are scraped in the moving process of a scraper, the procedure of independently cleaning the slag shells is omitted, the used welding flux is sucked into a recovery cover through a fan, then the used welding flux enters a processing box through a suction pipe, and the welding flux recovery efficiency is improved. Impurities in used welding flux are screened out through the filtering plate, the treated welding flux is pumped into the welding flux box through the discharging pipe by the conveying pump, synchronous circulating recycling of the welding flux is achieved, repeated conveying is avoided, and time is saved.

The invention provides a drainage PE pipeline hot melting connecting device and method, and relates to the technical field of pipeline welding. The pair of side frames are rotatably arranged on the two sides of the base frame in the vertical direction respectively; the rotating frame is horizontally hinged to the side frame; the fixing pieces are arranged on the rotating frames on the two sides, and the fixing pieces on the two sides are used for clamping and fixing the to-be-butted pipelines on the corresponding sides correspondingly; the first driving part is arranged on the base frame and is used for synchronously driving the pair of side frames to rotate in opposite directions; the second driving part is arranged on the side frame and used for driving the rotating frame to swing up and down around the hinge shaft of the rotating frame and achieving position locking after swinging. The large-diameter PE pipeline can be controllably bent in limited operation spaces such as a groove, so that pipe ends are smoothly butted, and the safety of the bending process and the stability of a connecting posture are ensured.

The invention discloses an automatic welding guide head and a welding method for a structural tube core plate. The automatic welding guide head comprises a control system, and the control system is connected to a lifting module, a base plate module, a tube inserting module and a guide module; the control system controls the lifting module to drive the two clamped and suspended parallel and aligned metal plate substrates to horizontally move, lift or keep the two clamped and suspended parallel and aligned metal plate substrates fixed; the guiding head serves as a core guiding part for penetrating and welding of the pipe, is coaxially connected with the guiding frame and directly enters the guiding head, and direction deviation of the pipe in the penetrating process is avoided; full-process automatic operation is achieved through a control system, and key procedures do not need to be manually intervened from positioning and fixing of a metal plate base plate, automatic feeding and conveying of pipes, accurate alignment of a guiding module and penetrating, installing and welding of the pipes. The metal plate base plate is suspended and clamped by moving the transportation frame, physical exhaustion of operators is reduced, and operation efficiency is improved.