210 results about "Narrow gap" patented technology

The invention relates to the technical field of welding, in particular to a double-laser double-swing auxiliary MIG electric arc thick plate narrow gap welding method and device, and the welding method specifically comprises the following steps that S1, initial positioning is conducted; s2, performing double-laser cross scanning preheating; s3, MIG electric arc auxiliary fusion is conducted, specifically, MIG electric arc is introduced on the basis of a molten pool formed by laser, so that the molten pool is stably combusted under laser induction, the common molten pool effect is achieved, and complete fusion of the side wall and the root of the groove is promoted; s4, real-time monitoring and adjustment in the welding process are conducted, specifically, in the welding process, the state of a molten pool and the welding quality are monitored in real time, and the laser power, the electric arc parameters and the welding speed are dynamically adjusted; and S5, welding seam quality detection. The double-laser-assisted MIG electric arc is used, the stability of the MIG electric arc is remarkably enhanced, the advantage of MIG filling efficiency is brought into play, and the welding efficiency and the welding quality are effectively improved.

The invention provides a narrow gap swing laser welding pool wettability prediction method based on CFD simulation. The method comprises the following steps that an interaction platform is constructed through Python + PyQt5, and geometric modeling, UDF compiling and a material library module are integrated; the groove parameters and the swing track are dynamically loaded to a Fluent solver, and a full-coupling transient model of a steam recoil pressure-buoyancy-molten drop mass source item is established; in CFD-POST, the widest section of the molten pool is positioned on the basis of the contour surface with the volume fraction being 0.5, and Z-direction displacement-flow velocity data are extracted along the two side wall surfaces; fusing defects are predicted through double criteria of a bilateral average flow velocity difference threshold value and F test variance homogeneity; according to the method, dynamic quantitative evaluation of wetting behaviors can be achieved, the process development period is shortened, the defect detection rate is increased, and the method is suitable for aerospace thick plate welding quality control.

The invention provides a narrow-gap laser welding method and device for a thick-wall material, and the method comprises the following operation steps: S1, after a narrow-gap groove is formed in a to-be-welded workpiece, an upright-focal flat-topped laser beam emitted by a laser head acts on the bottom and the side wall of the narrow-gap groove, a flux-cored wire fed into the groove is melted, molten drops are formed and are transited to a molten pool, and the narrow-gap groove is formed; filling the groove and solidifying to form a filling layer; s2, a laser sensor is used for obtaining the original geometrical shape of the weld joint, and the weld joint groove morphology with feature points is extracted through coordinate transformation and visual image analysis; s3, the shape of the weld groove is converted into a geometrical shape under a welding robot coordinate system through a control unit, the position of the welding robot is adjusted according to the depth and width of the groove, and it is ensured that the distances between the flux-cored wire and the two sides of the groove are the same; according to the method, the welding quality and the welding efficiency can be improved, the stability of the welding process can be remarkably improved, the incomplete fusion defect of the side wall is reduced, and therefore self-adaption and automatic welding of large-thickness materials are achieved.

The present invention relates to the technical field of boiler manufacturing, and provides a weld seam structure suitable for a narrow gap water-cooled wall tube panel and a welding process. The weld seam structure comprises groove gaps formed between adjacent water-cooled wall tubes; joints are provided on the sides of the adjacent water-cooled wall tubes close to each other; the joints are distributed on the upper sides of the groove gaps, and the joints are communicated with the groove gaps; and the groove gaps comprise V-shaped grooves or U-shaped grooves. In addition to the original joints, adjacent water-cooled wall tubes are considered as a whole, and gaps formed between the water-cooled wall tubes are machined into groove gaps and welded with the joints, thereby increasing the thickness of a welding seam at a tangent point and the safety coefficient, facilitating ray radiographic inspection, and solving the technical problem of great hazards to the safe operation of units due to the fact that when the gaps between the adjacent water-cooled wall tubes are small, the welding quality at the tangent point position of the adjacent water-cooled wall tubes cannot be effectively guaranteed due to inconvenient observation, welding, and radiographic inspection.

The invention relates to the technical field of injection molding devices, in particular to an automobile interior trim part injection molding integrated forming device which comprises an injection molding machine, a position control mechanism arranged on the injection molding machine, a pushing mechanism arranged on the position control mechanism, a chip removal mechanism arranged on the pushing mechanism and two mold end grinding mechanisms arranged on the chip removal mechanism. The position control mechanism comprises a top plate, a supporting plate and a hydraulic part arranged in the supporting plate. The position control mechanism which can be finely adjusted to provide suspension is arranged on a top plate of a traditional double-colored plastic injection machine, the position control mechanism serves as a main bearing platform of the two sets of mold end grinding mechanisms at the moment, and the end faces of the two molds can be attached by the two sets of mold end grinding mechanisms along with closing of the upper mold towards the lower mold; rusty spots on the end surface of the mold are cleaned under the pressurization of the position control mechanism, so that effective rust removal operation on the end surface of the mold in a narrow gap in the injection molding machine is effectively ensured.

The invention discloses a method for reducing residual stress of a thick-wall TC4 titanium alloy narrow-gap laser wire filling welding joint and application. The invention belongs to the technical field of welding. The technical problem that an existing thick-wall TC4 titanium alloy narrow-gap laser wire filling welding joint is high in residual stress is solved. The method comprises the steps that firstly, a narrow-gap groove is machined, pre-welding vacuum heat treatment is conducted on a test plate to be welded, and then surface pretreatment is conducted; then putting the to-be-welded test plate subjected to surface pretreatment into a vacuum isothermal cabin for heat preservation; and finally, relative positions and welding parameters of a laser beam, a wire feeding pipe and a welding seam are set, the swing mode of the laser beam is linear swing, the scanning path of the laser beam is that the included angle between the scanning path of an initial layer and the welding direction is 0 degree, then each layer of scanning path rotates by 30 degrees relative to the previous layer, and a welding program is started to conduct layer-by-layer and pass-by-pass welding. The method is applied to narrow-gap laser wire filling welding of the thick-wall TC4 titanium alloy in the fields of naval vessels, aerospace and rail transit.

The invention belongs to the technical field of welding machines, and particularly relates to a welding gun adjusting mechanism of a thick-wall pipeline narrow-gap all-position automatic welding machine. The welding gun adjusting mechanism of the narrow-gap all-position automatic welding machine for the thick-wall pipeline comprises an awakened rail, a welding trolley is arranged on the rail, and an OSC displacement assembly, an AVC adjusting mechanism and a welding gun are arranged on the welding trolley. The rail clamping mechanism has the remarkable effects that compared with a traditional rail clamping mechanism, by arranging the rail and the clamping device, quick connection between the trolley and the rail is effectively improved, and the problems that in the prior art, when an automatic welding trolley is additionally installed on the rail, clamping is difficult, positioning is inaccurate during welding, consequently, a welding seam cannot be straight, and the welding quality is poor are solved. Welding is not in place, and the like. According to the design, additional corollary equipment does not need to be installed, the installation space of the chassis of the rail trolley is reduced, meanwhile, the operation buffering effect is good, and operation is more stable; the front and rear wheels are simultaneously tightened and separated, so that the loading and unloading efficiency is improved.

The invention belongs to the field of subsea pipeline welding, and particularly discloses a bottom sealing welding process curve based on a narrow-gap U-shaped groove, application and a product, the bottom sealing welding process curve is used for welding the narrow-gap U-shaped groove, and on the basis of a CMT reference curve, at least one current pulse is introduced before and after the short-circuit stage respectively, so that the narrow-gap U-shaped groove is welded. Therefore, the root fusion width is increased, the root recess is avoided, the peak current and the cycle time are increased to increase the welding heat input, and the peak current rising rate and the peak current falling rate are reduced to prolong the peak current acting time. According to the method, the welding heat input and the root fusion width can be increased, the excellent single-face welding and double-face forming effect is achieved under the conditions of zero-gap assembly and no liner, the problem of weld defects is solved, and the service performance of the acid marine pipeline is effectively improved.

According to the double-laser-assisted MIG arc horizontal position welding method and device, through asymmetric narrow gap groove design (a3gt, a1gt and a2), the angle of an upper side groove is slightly larger than that of a lower side groove, the laser irradiation effect of an upper side wall can be improved, it is guaranteed that the upper side groove can be fully covered with laser and an arc, and the tendency of incomplete fusion defects is reduced; and meanwhile, the lasers are arranged in an asymmetric form, auxiliary lasers are obliquely emitted to the upper side wall of the groove from bottom to top to form an auxiliary laser molten pool, the height (d4) of the molten pool is widened, the problem that the molten pool on the upper side wall is prone to incomplete fusion under the action of gravity during horizontal welding of traditional laser-arc hybrid welding can be effectively solved, and the welding quality is improved.

The invention discloses a narrow gap welding gun, comprising an air intake cooling block, an air intake block and a conductive nozzle. Compared with the prior art, the invention has the following beneficial effects: the air intake block is set as a flat strip plate structure, so that the lower end of the air intake block is conveniently placed in the narrow gap; the conductive nozzle is installed in the middle of the gap and the two sides of the gap are connected with two gas flow channels, so that the combustion-supporting gas can flow out through the two sides of the gap to fill the narrow gap and wrap the conductive nozzle at the same time, thereby ensuring that the conductive nozzle fully melts the welding wire.

The utility model discloses a narrow-gap electromagnetic drive inspection robot device which comprises a frame, magnetic wheel sets are installed on the two sides of the frame respectively, an image module is installed at the front end or the rear end of the frame, a supporting module is installed on the frame, the supporting module comprises supporting idler wheels, and the supporting idler wheels are elastically installed on the frame. By means of the magnetic wheel sets installed on the two sides of the frame and the supporting module installed on the frame, the robot can walk longitudinally and stably in a narrow gap between a generator set stator and a rotor, and an operator can conduct nondestructive testing on the surface of the generator set stator through the image module.

The utility model relates to a movable narrow-gap welding device used on site, and belongs to the technical field of welding. According to the technical scheme, a two-dimensional moving mechanism composed of two sliding tables is arranged on a moving device (1), a narrow-gap welding gun (2) and a laser sensing device (3) are arranged on the two-dimensional moving mechanism, and the two-dimensional moving mechanism drives the narrow-gap welding gun (2) and the laser sensing device (3) to move in the left-right direction and the up-down direction of a welding seam; a welding gun rod (201) is arranged on a welding gun body (220) of the narrow-gap welding gun (2), the bottom of the welding gun rod (201) is connected with an offset contact tube (211), and the offset contact tube (211) is driven to rotate in a reciprocating mode or continuously rotate by rotating the welding gun rod (201). The welding device has the advantages of being simple in structure, light in weight, flexible to disassemble and assemble, stable, reliable, capable of being suitable for large-size-range-change groove welding, especially suitable for welding under the site construction condition, and good in welding quality.

The invention relates to the technical field of rolling mills, in particular to a rolling mill roller parallelism fast adjusting device which comprises a bottom plate, a vertical plate and a main transmission mechanism, the output end of the main transmission mechanism is in meshed connection with a working roller and a supporting roller which are vertically distributed, and the supporting roller penetrates through the vertical plate and extends to the two sides of the vertical plate. The positions, corresponding to the vertical plates, of the working rollers and the supporting rollers are sleeved with bearings, the section width of the bearings is larger than the thickness of the vertical plates, guide grooves are formed in the vertical plates, and hydraulic mechanisms are fixedly installed at the upper ends of the guide grooves. The sharp-angle tip of the trapezoidal feeler gauge can be easily inserted into a narrow gap between the two cylindrical bearings, accurate positioning can be achieved, stable supporting can be applied to the supporting roller, and the supporting roller can be accurately positioned under the condition of not depending on the hand feeling of an operator by being matched with the fine-adjustable working roller hydraulic lifting mechanism. Standardized and quantitative measurement and comparison are carried out on the gap between the two ends of the roller, so that a direct and reliable basis is provided for quickly and accurately adjusting the parallelism.

The invention relates to the technical field of titanium and titanium alloy welding, and provides a titanium alloy annular seam efficient large-deposition vibration wire feeding narrow gap welding method, by innovatively designing an asymmetric inclined groove combined with an asymmetric arc swing and an asymmetric vibration wire feeding technology, by designing an asymmetric inclined groove between the upper and lower parts of the groove, the influence of gravity on the welding molten pool is effectively reduced; the asymmetric arc swing technology is adopted to extend the residence time of the tungsten electrode at the upper part of the groove to preheat the side wall, while shortening the residence time at the lower part, reducing heat input, and preventing the molten pool metal from dripping down; combined with the introduction of asymmetric vibration wire feeding technology, according to the different positions of the tungsten electrode at the upper and lower parts of the groove, the vibration mode of the welding wire is dynamically adjusted, the surface tension of the deposited metal is improved, the uniform spreading of the large deposited metal in the groove is promoted, and the flow of the molten pool is disturbed by vibration, the accumulation of the deposited metal at the lower part of the groove is effectively prevented, and the heat distribution and the molten pool behavior during welding are optimized.

The present invention relates to a narrow gap laser-GMAW composite welding method coupled with a molten pool, and belongs to the field of welding technology. The technical scheme is as follows: during welding, the spot of the laser beam (1) swings along a predetermined trajectory inside the narrow gap groove, melts the side wall of the narrow gap groove, and forms a laser molten pool (3); the GMAW arc (2) remains stationary at the center position of the narrow gap groove, directly acts on the laser molten pool (3), and the GMAW arc (2) forms a liquid metal that spreads and flows along the surface of the laser molten pool (3) under the action of surface tension, and after coupling with the laser molten pool (3), a composite molten pool (4) is formed, which is finally cooled and solidified into a weld (5). The present invention ensures that the side wall of the narrow gap groove is well fused. Since the GMAW arc and welding wire do not perform periodic reciprocating motion during the welding process, the wear of the conductive nozzle is significantly reduced. In particular, for materials such as high-strength steel, stainless steel and titanium alloy, the welding stability and reliability are significantly improved during long-term welding.

The utility model provides a pipeline narrow-gap automatic welding and weld joint polishing device, which comprises a circular rail mounted on a pipeline, coaxial with the pipeline and spaced from a narrow-gap weld joint by a certain distance; the walking mechanism is mounted on the circular rail and can move along the circular rail; the executing mechanism is mounted on the walking mechanism, can move along the circular rail along with the walking mechanism, and is used for stretching into the narrow gap to automatically weld a welding layer and polish a welding seam; and the image acquisition device is mounted on the walking mechanism, can move along the circular rail along with the walking mechanism, and is used for collecting the welding and polishing conditions of the welding layer. Compared with the prior art, the automatic narrow-gap welding and weld joint polishing device for the pipeline has the advantages that free switching between a welding function and a polishing function is achieved, the welding speed and the polishing speed can be increased, the polishing condition of a welding layer can be conveniently observed through the image acquisition device, and reliable basis is provided for operators to judge whether polishing is qualified or not; and closed-loop control over grinding is achieved.

1. Name of the Design Product: Homogenizer. 2. Use of the Design Product: Based on the interaction between a high-speed rotating rotor and a stator, the homogenizer enables materials to be efficiently, rapidly and evenly distributed into one or more immiscible phases into another continuous phase under the combined action of strong shear, extrusion, liquid layer friction and turbulence in the narrow gap between the stator and the rotor. 3. Design Key Points of the Design Product: Lies in the shape. 4. Picture or Photograph Best Showing the Design Key Points: Perspective view. 5. The claimed design includes color.

This invention discloses a barbed locking type large-diameter thin-walled reinsertion pipe and its application method, belonging to the field of wellbore stimulation technology for old wells in low-permeability oil and gas fields. It includes, from top to bottom, a reinsertion pipe, an expansion anchor, a C-ring cone, a C-ring, a sealing ring, a return sleeve, and a 4-1 / 2" casing. During use, the return sleeve forms a seal with the inner diameter of the 4-1 / 2" casing. During the insertion of the reinsertion pipe into the return sleeve, the expansion anchor presses down on the C-ring cone, which in turn presses down on the sealing ring. The sealing ring, under pressure, generates radial extrusion force, causing it to squeeze the inner wall of the 5-1 / 2" old wellbore casing, thus achieving a seal. This invention is applicable to fracturing operations in complex well conditions such as old well repair, wellbore reconstruction, and narrow-gap wellbore completion.

A support roller for track-type agricultural machinery, comprising an axle retaining ring (100), a hub retaining ring (200), an adapter support member, and a rubber protective layer (400). The adapter support member is arranged between the axle retaining ring and the hub retaining ring and is composed of six arc-shaped support ribs (300), wherein the two ends of each support rib are connected to an inner wall of the hub retaining ring, and the middle part thereof is connected to an outer wall of the axle retaining ring, such that a hollowed-out structure is formed between the support ribs, the axle retaining ring and the hub retaining ring, which hollowed-out structure ensures the structural strength and enables communication between two sides of the adapter support member; each of the support ribs is connected to the outer wall of the axle retaining ring by means of an adapter rib (310), which prevents the formation of a narrow gap at the joint of the support rib and the axle retaining ring, and facilitates cleaning and maintenance; and the rubber protective layer is attached to an outer wall of the hub retaining ring by means of vulcanization, such that the outer wall of the hub retaining ring is protected and buffered, enabling shock absorption and load bearing, and contributing to the extension of the service life.

A method for controlling excess material in the weld gap of the front section of an aircraft engine air intake casing is characterized by employing an advanced spiral milling process to ensure dimensional accuracy. The thickness of the excess material generated can be controlled by adjusting the spiral milling parameters. In the spiral milling process, the thickness of the excess material generated is directly related to the depth of each revolution of the machining tool. When the depth per revolution reaches 1.33 mm, the excess material thickness generated is 0.66 mm, reducing the probability of excess material entering the gap by over 90% through field verification. The tooling utilizes a split structure, consisting of a scraper hook and a handle. Due to the narrow gap, the scraper hook thickness does not exceed the gap width. Advantages of this method include significantly improving the machining quality of the front section of an aircraft engine air intake casing, completely eliminating excess material in the weld gap, and completely eliminating losses caused by excess material in the weld gap of the front section of the air intake casing. The probability of excess material in the weld gap of the front section of an aircraft engine air intake casing can be reduced to zero, effectively preventing the occurrence of related problems.

The invention discloses a double-side-arranged type double-layer inner side bent nozzle device and a narrow gap welding method thereof.The nozzle device is composed of an outer-layer front nozzle pipe and an inner-layer front nozzle pipe which are arranged in the vertical direction, and each nozzle pipe is formed by connecting an upper connecting section, a middle vertical section and a lower bent section; wherein the middle vertical section and the lower bent section both extend into the narrow-gap welding groove and can be used in the full groove depth; the lower bent sections of the inner-layer front nozzle pipe and the inner-layer rear nozzle pipe are both bent towards the inner side and are respectively aligned with the lower section of the contact tube of the welding torch from the front side and the rear side, and the lower bent sections of the outer-layer front nozzle pipe and the outer-layer rear nozzle pipe are both bent towards the inner side and are respectively aligned with a welding arc area in the groove obliquely downwards from the front side and the rear side; and the inner / outer layer nozzle air flow is vectorized and adjusted to protect a welding high-temperature area, meanwhile, the contact tube is directly cooled, and the contact tube and the lower end face of the welding torch body are prevented from being impacted by welding high-temperature hot air, so that the narrow-gap welding quality is improved, and the service life of the welding torch contact tube is prolonged.

The utility model discloses a pair of locking pliers for a reinforcing steel bar extrusion connecting joint in a narrow space, which comprises two force arm connecting seats, two force arms are symmetrically arranged between the two force arm connecting seats, one ends of the two force arms are connected with a bidirectional telescopic hydraulic cylinder, and the other ends of the two force arms are provided with a pressing module. The pressing module comprises two half cylinders, the two half cylinders are arranged on the opposite sides of the two force arms respectively, and protruding arc-shaped teeth are arranged on the inner walls of the half cylinders. Through the lever principle, extrusion force is large, extrusion passes are few, a jaw is small, and convenience and flexibility are achieved; the device is suitable for steel bar connection operation in space-limited environments such as narrow gaps in construction sites and difficult-to-touch areas such as the bottoms of bridges, manual operation difficulty is reduced, construction safety is improved, rapid clamping and releasing are achieved through two-way stretching and retracting of the hydraulic cylinders, construction efficiency is improved, and construction safety is improved. Due to the design of the pressing module, it is ensured that the rebar joints are evenly and effectively extruded, and the connection strength is improved.