135 results about "Narrow gap" patented technology

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 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.

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 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 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.

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.

This invention relates to the field of pipe welding, and particularly to a method and system for the construction of thermal pipe butt joints. The method includes the following steps: pre-setting a stepped bevel at the pipe joint to be butt joint, featuring a smooth transition between a large-angle transition section and a narrow-gap welding section, with micro-grooves on the surface; fixing the pipe joint using a pipe butt joint device; dynamically calibrating the support force using a pressure sensor and control terminal to ensure the pipe joint alignment deviation is within a standard range; and performing welding using DC positive polarity TIG welding, pulsed TIG welding, or hot-wire TIG welding. The system includes a pipe butt joint device and a welding device. This solution optimizes arc energy distribution through a double-step bevel, enhances fusion through micro-grooves, improves butt joint accuracy through dynamic calibration, controls thermal deformation, and optimizes weld quality through CNC welding. It can reduce defect rates, decrease filler metal usage, increase deposition efficiency, improve first-pass yield, shorten the cycle time, and reduce costs.

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 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.

The invention discloses a remote jet fire extinguishing device for an unmanned aerial vehicle, and belongs to the field of unmanned aerial vehicles, the remote jet fire extinguishing device comprises the unmanned aerial vehicle, the unmanned aerial vehicle is provided with a protection piece replacement mechanism, the unmanned aerial vehicle comprises a first fuselage, a first mounting plate is rotatably arranged at the bottom of the first fuselage, and a first jet pipe and a second jet pipe with adjustable spacing are detachably mounted on the first mounting plate; the protection piece replacement mechanism comprises a box body, the box body is fixed to the unmanned aerial vehicle, a sealing door is rotatably arranged on the box body, a camera is detachably installed in the box body, a storage area and a storage area are arranged in the box body and located above and below the camera, a first baffle is slidably arranged on the storage area, and a second baffle is slidably arranged in the storage area. Movement can be achieved through the propellers of the unmanned aerial vehicle, when the distance between buildings is too small, the included angle of the multiple rotating arms is rotationally adjusted, the size of the unmanned aerial vehicle is changed, and the four sets of walking wheels are attached to the walls of the two sides defining the slit correspondingly, so that the unmanned aerial vehicle can walk in the slit and move to the position close to a fire source.

This utility model relates to the technical field of fluid heat transfer experimental equipment, and provides a narrow-slit annular flow channel experimental device, including: an adjustable narrow-slit flow channel module, a cold water circulation system, and a hot water circulation system; the adjustable narrow-slit flow channel module includes: multiple sets of experimental flow channels; each experimental flow channel includes: an outer tube and an inner tube arranged concentrically; a narrow slit is formed between the outer tube and the inner tube; the inner tube diameters of different experimental flow channels are different; a cold water inlet is provided at one end of the outer tube, and a cold water outlet is provided at the other end; the cold water inlet and cold water outlet are connected to the cold water circulation system; a hot water inlet is provided at one end of the inner tube, and a hot water outlet is provided at the other end; the hot water inlet and hot water outlet are connected to the hot water circulation system. This utility model meets the comparative experimental needs of flow channels with different gaps and different materials, and can study the fluid resistance and heat transfer characteristics under different conditions, providing rich experimental data for related research.

A flip-type multi-axis narrow-gap welding workstation and welding method, belonging to the field of welding technology, includes a flip-type base with a clamping mechanism rotatably mounted on it. The clamping mechanism includes a support platform, with a first clamping unit and a clamping base movably mounted at both ends of the support platform. Several second clamping units are movably mounted on both sides of the central axis along the length direction of the support platform, and two crossbeams are symmetrically fixed on both sides of the central axis along the length direction of the support platform. The crossbeams are located outside the second clamping units, and each crossbeam is equipped with a corresponding narrow-gap welding mechanism that moves along three axes. The multi-directional clamping units, in conjunction with the support platform, reliably clamp thick plate workpieces, flipping them from a flat welding posture to a vertical or near-vertical welding state. The molten pool formation is stable, and the use of a narrow-gap welding torch significantly reduces the amount of filler metal used in the weld, lowers the welding heat input, suppresses plate deformation and residual stress, and saves welding wire and welding time.

The invention provides a heat treatment method for narrow-interval welding seams of a pipeline, and belongs to the technical field of metal material welding heat treatment. The method comprises the steps that the interval between every two adjacent welding seams and the diameter and thickness of the pipeline are measured; performing hardness detection on the two welding seams, the base metal around the welding seams and the base metal in the middle area of the two welding seams; arranging a thermocouple at the hardness detection position; the two welding seams and the adjacent areas of the two welding seams are wrapped with heating pieces correspondingly; heat preservation pieces are arranged on the surface of each heating piece, the area where the heating pieces are not arranged between the two weld joints and the area where the two heating pieces deviate from each other; setting heat treatment time and temperature for heat treatment according to pipeline wall thickness and hardness detection results; and detecting the weld hardness after heat treatment to finish heat treatment. According to the method, through division of the areas of the two welding seams, hardness detection, thermocouple arrangement and heat preservation cotton arrangement, on-site simultaneous heat treatment of the two welding seams with the small distance is achieved, the heat treatment standard requirement is met, meanwhile, time can be saved, and damage to materials is avoided.

The utility model relates to a device for adjusting coaxiality in a narrow space, and belongs to the technical field of couplings. According to the utility model, the coaxial adjusting bracket is additionally arranged outside the coupling between the encoder and the motor shaft, and the coaxial adjusting bracket comprises the two detachable and spliced rotary bodies, so that the coaxiality among the coupling, the encoder and the motor shaft can be adjusted and corrected by adjusting the gap between the two rotary bodies; the coaxiality adjusting device is small in occupied space, can adapt to coaxiality adjustment in a narrow gap, overcomes the defect that a dial indicator cannot be installed, can accurately control coaxiality deviation, is convenient and fast to disassemble after adjustment, is light in overall structure, can perform adjustment operation only through an adjusting bolt, and improves the work efficiency of coaxiality adjustment.

The present invention discloses a method, system, device, and medium for controlling narrow-gap pre-fill welding. The method first obtains a top-view image of the pre-filled weld groove region with orthogonal horizontal and vertical scale lines. The method then uses the top plane of the pre-set slats as the pre-welding plane, measures the groove width of the pre-welding plane, determines the groove center coordinates based on the top-view image, and calculates the laser oscillation amplitude based on the groove width. The method then adjusts the light spot centering position based on the groove center coordinates and the laser oscillation amplitude based on the calculated laser oscillation amplitude. Finally, when the light spot centering position satisfies a first preset condition and the laser oscillation amplitude satisfies a second preset condition, a welding enable signal is triggered to proceed with welding. The present invention can solve the problem of poor sidewall fusion in narrow-gap pre-fill welding and improve welding efficiency and quality.

The utility model discloses a concave-convex roller sheet of a double-roller sand making machine, which comprises a driving roller sheet and a driven roller sheet, a rolling surface I is arranged on the outer wall of the driving roller sheet, a convex ring I and a convex ring II are arranged on the outer wall of the driving roller sheet, and the rolling surface I is positioned between the convex ring I and the convex ring II. According to the utility model, a concave surface structure is formed at the rolling surface I through the convex ring I and the convex ring II, and a narrow gap with uniform width can be formed between the rolling surface I and the rolling surface II when the driven roller skin is close to the driving roller skin, so that when the roller surfaces of the roller skin of the sand making machine are used, the abrasion loss at each part is the same, and the service life of the roller skin is prolonged. Therefore, the uniformity of the roller surface can be maintained for a long time, the roller surface of the roller skin does not need to be trimmed when the sand making machine is used for a long time, the maintenance cost of the double-roller sand making machine is reduced, uniform feeding of the double-roller sand making machine is achieved, the effect of maintaining uniform abrasion of the roller skin is achieved, the actual working area is increased compared with a common plane roller, and the service life of the double-roller sand making machine is prolonged. And the yield is improved.

The invention discloses a narrow-gap rotor and stator annular movement detection robot and a use method thereof.The narrow-gap rotor and stator annular movement detection robot comprises a walking device, a guiding device, an inspection device and a probing guide rail, the walking device is used for walking on a rotor and a stator, the guiding device is installed on the walking device and stretches into a gap between the rotor and the stator, and the inspection device is installed on the guiding device; the upper end of the probing guide rail is installed and connected with the walking device, the lower end of the probing guide rail extends into the gap between the rotor and the stator, the inspection device is installed on the probing guide rail in an up-down moving mode, and a detection unit is installed on the inspection device and used for detecting the rotor and the stator. The detection of the outer circumferential wall of the rotor and the inner circumferential wall of the stator can be carried out without lifting out the generator rotor, the detection time period is shorter, the consumed labor cost is lower, and equipment damage is not easily caused.

The invention relates to the technical field of one-way valves, in particular to a high-response-speed low-flow-resistance one-way valve which comprises a first plate, a valve and a second plate which are sequentially stacked, and a plurality of first through holes evenly distributed at intervals are formed in the surface of the first plate; the surface of the second plate is provided with an open area covering the first through hole arrangement area. The valve is movably arranged between the first plate and the second plate, a plurality of second through holes distributed at intervals are formed in the surface of the valve, and the second through holes and the first through holes are distributed on the plane in a staggered mode and exposed in the open area; through the design, when the fluid flows reversely, the fluid can directly impact the surface of the valve through the open area to drive the valve to close the first through hole to achieve reverse cut-off, delay of the fluid permeating into a narrow gap can be effectively reduced, and therefore the closing response time of the valve is shortened; and the pressure loss of fluid permeating between the second plate and the valve can be reduced, so that the high-frequency response performance of the valve is effectively improved.

To efficiently perform sound welding by suppressing weld defects while suppressing a welding amount and preventing the occurrence of high temperature cracks in flat position welding.SOLUTION: In a narrow groove 50 of horizontal welding, a lower groove angle θ on a lower plate 5A side is set to 35 ° to 45 ° upward from the horizontal, and an upper groove angle α is set to be larger than the lower groove angle θ in a range of 2 ° to 5 °. In the inclined narrow groove welding method, a root gap RG of a narrow groove 50 is set in a range of 9 mm-12 mm, a backing metal 6 is provided which is attached to a lower plate 5A and an upper plate 5B and positions a groove surface lower end part 5A of the upper plate 5B and sets a groove angle and the root gap RG, a contact tip having a wire hole for feeding a weld wire into the narrow groove 50 is inserted, and the lower plate 5A and the upper plate 5B are welded without rotating the contact tip around a nozzle shaft in one pass in the narrow groove 50.SELECTED DRAWING: Figure 3

1. The name of the design product: handheld cleaning equipment brush head. 2. The use of the design product: the design product is used to connect the handheld cleaning equipment, clean the narrow gap area. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: design 1 perspective view 1. 5. Design 1 is designated as the basic design.

The utility model discloses a high accuracy gap measuring instrument, including first calliper, second calliper and measuring head, the first calliper top is equipped with the second calliper of symmetrical structure, and first calliper and second calliper right -hand end are rotated and are connected through the connecting ear, first calliper and second calliper left -hand end all are equipped with the measuring head of integral type structure. The utility model installs the screw micrometer measuring device on the handle in the mode of rotation, and the intersection point of two measuring heads and the connecting ear are in the same horizontal straight line, and two measuring heads are conical structure, and cooperate the tangent design of staggered up and down, can go into the narrow gap or adhere to the arc surface, are applicable to the gap measurement under a variety of complex working conditions, overcome the defect that traditional plug gauge is strong in rigidity, and the poor adaptability, is equipped with the spring between two handles, and through the kneading of two handles, can realize two measuring heads stagger and measure the space, realizes automatic reset after measuring, simple operation and high measuring accuracy.

The invention relates to the technical field of injection molds, and discloses a multi-station steel-plastic material injection mold which comprises a fixed mold, the fixed mold is in sliding fit with a movable mold through an external guide mechanism, and the multi-station steel-plastic material injection mold adopts the integrated design of station conversion, posture compensation and flexible driving. On one hand, by means of the multi-station layout that the outer ring gear ring drives the female die to be distributed in the circumferential direction and in cooperation with the posture compensation function brought by the planetary gear pair, the female die is always kept parallel and aligned with the male die in the station conversion process, and the machining precision of the female die is greatly improved; and after each time of conversion, the die can be accurately positioned to a preset feeding and discharging station, so that an operator does not need to repeatedly move in a narrow gap between the fixed die and the movable die to find cavities of different stations, and steel part filling or plastic part unloading can be carried out on the female die rotating to the position only in a fixed feeding and discharging area.

The invention discloses a magnetic control narrow-gap horizontal position welding process based on welding wire arc synchronous swing and a control method, and relates to the field of automatic welding. The magnetic control narrow-gap horizontal position welding process comprises the following steps that an alternating magnetic field driven by a magnetic control power source is used for controlling an arc to swing, and alternating current output by a vibration power source is synchronously used for driving a vibration coil to generate the alternating magnetic field; the alternating magnetic field interacts with a bias magnetic field formed by a permanent magnet fixed to the wire feeding pipe, and periodic electromagnetic force is generated to control the welding wire to swing directionally. The oscillation frequency of the output current of the magnetic control power supply is consistent with the oscillation frequency of the current of the electromagnetic force driving power supply, and the phases of the two are synchronous; by adjusting the pulse width duty ratio of positive and negative half waves of the alternating current, the retention time of the arc on the groove wall on the upper side is longer than that on the lower side; according to the horizontal position welding process and the control method, high-precision and high-repeatability control over the swing amplitude is further achieved.

The invention relates to the field of clamps for repairing, in particular to a tool clamp for repairing an injection molding machine base based on a repairing material, which comprises a U-shaped frame, a moving plate is arranged on the right side of the U-shaped frame in a left-right sliding manner through a guide column, and two support plate frames which are symmetrically arranged up and down are fixedly mounted on the right side of the U-shaped frame; a linkage plate located on the right portion of the moving plate is rotationally arranged between the two supporting plate frames, and the supporting plate frames and the linkage plate are jointly provided with a feeding mechanism for supplementing a repairing agent into cracks and a locking mechanism for gradually applying extrusion force to the outside from the middle. The material pushing plate is driven to slide leftwards on the inner side of the rotating cover, the repairing agent is directly pushed into cracks, when the material pushing plate continuously moves leftwards, the end face of the material pushing plate exerts extrusion force on the repairing agent, the repairing agent is forced to penetrate into narrow gaps of the cracks, the deep positions of the cracks are effectively filled, and the problem of insufficient filling caused by manual smearing is avoided as much as possible.

The invention discloses a narrow gap automatic welding and manual welding device which comprises a welding mechanism, a clamping and fixing mechanism, a surrounding mechanism and a fixing mechanism, the welding mechanism is detachably connected to the clamping and fixing mechanism and used for welding a pipeline, the clamping and fixing mechanism is fixedly connected to the surrounding mechanism and used for clamping and fixing the welding mechanism, and the surrounding mechanism is used for surrounding the welding mechanism. The surrounding mechanism is fixedly connected to the fixing mechanism and used for driving the welding mechanism to rotate around the pipeline, and the fixing mechanism is detachably connected to the pipeline and used for supporting the surrounding mechanism. The narrow-gap automatic welding and manual welding device provided by the invention can be used for effectively welding a narrow-gap pipeline, and can be used for automatic welding and manual welding, so that the labor intensity of welders is reduced, the welding efficiency is improved, and the construction period is shortened.

The present invention discloses a narrow-slot overhang energy dissipator, comprising a base plate and symmetrical guide walls disposed on either side of the base plate. The spacing between the two guide walls gradually decreases along the direction of water flow on the base plate, and the downstream ends of the two guide walls are located outside the downstream end of the base plate. The inner sides of the ends of the two guide walls are each provided with at least one toothed ledge along the height direction. The narrow-slot overhang energy dissipator of the present invention solves the technical problem of high pressure loads on the base plate of a water cushion pond in shallow water conditions in the prior art.

The invention discloses a servo filling device and method for a powder metallurgy press, and relates to the field of preparation of automobile shock absorber pistons, and the servo filling device is characterized by comprising a rack, a powder feeding mechanism, a servo control mechanism and a pushing support mechanism. The servo control mechanism drives the discharging head to move to the position above the female die cavity and execute horizontal reciprocating micro-motion shaking, the powder bridging effect is damaged through inertia shearing force, narrow gaps are forcibly filled with powder, and the problems of insufficient filling and uneven density are solved. The pushing support mechanism synchronously moves along with the sliding block and applies vertical pressing force to the discharging head, and decoupling of horizontal driving and vertical pressing is achieved. It is ensured that the discharging head is always attached to the workbench through flexible attaching pressure during high-frequency shaking, inertia run-out is effectively overcome, and the density consistency of green bodies and the piece weight precision of products are remarkably improved while dynamic sealing performance is ensured and powder splashing is eradicated.

The high-precision intelligent screwdriver comprises a sleeve, a mounting frame is arranged in the sleeve in a sliding mode, rotating shafts are rotationally arranged on the two sides of the interior of the mounting frame, a first magnet is fixedly arranged in the middle of the outer surface of one side of each rotating shaft, and a second magnet is arranged below the first magnet. A second magnet is fixedly connected with the mounting frame, a mounting base is fixedly arranged between the rotating shafts, two dampers and a first spring are fixedly arranged in the mounting base, and a first gear is rotationally arranged at the end, located in the sleeve, of the mounting base. The use mode of the device can be changed by changing the positions of the mounting frame and related components thereof, so that the hands of a worker can be prevented from being extruded for a long time, the adaptability of the screwdriver can be improved, and the screwdriver can enter some narrow gaps for operation.

The invention provides a resistance roll welding device and application thereof, the core of the resistance roll welding device is that a split type design roll welding wheel assembly is adopted, the upper rim of an upper roll welding wheel is provided with unique pressing sheets arranged in a piano key mode, and the pressing sheets and adjacent grooves jointly form a concave-convex structure capable of rotating along with the upper roll welding wheel. The concave-convex structure and the fixedly-arranged spring ejector pin assembly have a synergistic effect, in the rotating process of the upper roll welding wheel, the end of the ejector pin is always kept in contact with the concave-convex structure, an electric contact at the tail of the ejector pin can be driven to make contact with or be separated from an electrifying terminal through axial displacement, and therefore precise programmed control over welding current is achieved. When the resistance roll welding device is applied to stitch welding of the multi-layer extremely-narrow-spacing thin plate girth, the device can effectively stretch into a narrow gap, accurate pressure application to an independent area is achieved, the technical bottleneck of welding of the multi-layer extremely-narrow-spacing thin plate girth is thoroughly broken through, and the welding efficiency is improved. And the welding quality, the process precision, the production efficiency and the reliability are remarkably improved.