72results about How to "Easy to weld and install" patented technology

A process for fabricating a leadless plastic chip carrier. A first surface of a leadframe strip is selectively etched to thereby provide depressions in the first surface and metal contacts are deposited in the depressions in the first surface of the leadframe strip. At least one layer of metal is selectively plated on at least the metal contacts to provide a plurality of selectively plated contact pads and a die attach pad. A semiconductor die is mounted on the first surface of the die attach pad and the semiconductor die is wire bonded to ones of the contact pads. The wire bonds and the semiconductor die are encapsulated in a molding material such that the molding material covers the die attach pad and the contact pads. The leadframe strip is etched away thereby exposing the metal contacts in the form of an array and the leadless plastic chip carrier is singulated from other leadless plastic chip carriers.

The invention discloses a hull curved block manufacturing method. The hull curved block manufacturing method includes the steps of carrying out pretreatment on a steel component; carrying out cutting, filling and processing; manufacturing an iron sample table; proofing and modifying an external board rib, specifically, the external board rib is subjected to secondary proofing and firer modification on the iron sample table to make the linetype of the external board rib coincident with the linetype of a corresponding rib on the iron sample table; manufacturing a triangular rib framework, specifically, the triangular rib framework is formed together by the external board rib, a deck cross beam and a temporary inclined strut; manufacturing components, a deck holder and a curved block framework; carrying out assembly welding of a curved external board; and carrying out assembly welding of block parts in bulk and hull block inspection. By adoption of the method, time and cost for manufacturing a curved jig frame are omitted by designing and manufacturing the triangular rib framework; meanwhile, the linetype data of the external board are guaranteed precisely, and the triangular rib framework has sufficient structural stiffness, so that positioning and assembly welding of the external board are convenient, the construction difficulty of the whole curved block is remarkably decreased, and economic benefits are high.

The invention discloses a low-temperature liquid storage tank making method, including case installation and inner tube installation. First install the case: weld the first wall plate on the top of the case, install case top cap on the top of the first wall plate, lift the first wall plate, install the second wall plate by the above method, weld the first and second wall plate around seam and lift them. on the analogy of this, from top to bottom, weld the rest wall plate, and finally weld the bottom and the bottom plate. The method of inner tube installation is basically identical with that of the case installation. The case plays a role in screening and shielding wind and rain to benefit inner tube installation, largely heightening welding quality and playing a role in moistureproofing. It eliminates high-altitude work.

A connection-type printed board electrical connector, including a butt plug connected to a mounting board, a socket fixed on a printed board with a surface sticker, a floating mechanism is provided on the butt plug, the contacts of the butt plug and the printed The pins of the surface mount socket on the board are connected by a flexible cable. The present invention uses a flexible cable to connect the butt plug of the electrical connector and the surface-mounted fixed socket, thereby reducing the force transmission between the two mechanisms. The plug end of the floating installation can float within a certain space range without affecting the socket welded on the printed board, which enhances the stability of the surface mount socket. At the same time, the length of the flexible wire between the two can also be controlled according to requirements, which is convenient for welding and installation.

The invention relates to the field of anti-wear composite material and discloses a composite material used for resisting impact and wear and a preparation method. The composite material comprises a steel base bottom, a rubber intermediate layer and a high-chromium-alloy wear-resistant layer and the high-chromium-alloy wear-resistant layer is bonded with the steel base bottom through the rubber intermediate layer. The invention has the preparation method that the steel base bottom is cast or welded, then the high-chromium-alloy wear-resistant layer is cast; afterwards the rubber interlayer is vulcanized on the steel base layer and finally the high-chromium-alloy wear-resistant layer is vulcanized and bonded on the rubber intermediate layer. Resisting wear and impact, reducing noise and resisting erosion, the composite material prepared by the invention can be widely applied to the working situations where high impact and wear exists in the industries such as mine, power and machinery.

The invention discloses a concave plate screen of a combine harvester. The concave plate screen comprises frames on the two sides and is characterized in that spaced arc-shaped fixed plates are fixedly connected between the frames on the two frames, the arc-shaped fixed plates are matched with rollers on the harvester, the plate faces of the arc-shaped fixed plates are parallel to one another and are perpendicular to the axes of rotary shafts of the rollers, spaced square steel bars are arranged on the arc-shaped fixed plates in a penetrating mode, at least one round steel bar is arranged between every two adjacent square steel bars, and the square steel bars and the round steel bars are parallel to the axes of the rotary shafts of the rollers. The invention further discloses a concave plate screen device. An arc-shaped screen is formed by assembling the concave plate screens. The concave plate screen and the concave plate screen device are convenient and fast to mount, machining cost is greatly saved, and the threshing and cleaning effect is good. Due to the fact that the concave plate screens can be interchanged, tool manufacturing cost is lowered, and the use and maintenance cost of the harvester is lowered, and the use value of the harvester is improved.

The invention relates to the technical field of an antenna and particularly relates to a micro antenna for 5G mobile communication. The micro antenna comprises a metal reflection plate, a dielectric substrate, a metal square cut angle radiant patch, a metal rectangular radiation patch, a first metallized through hole, a first metal disc, a flanged fixed connector, a second metalized through hole and a short-circuit metal column, wherein the flanged fixed connector is coupled with the first metal disc through the first metallized through hole for feeding, and the short-circuit metal column penetrates through the second metalized through hole. The micro antenna is advantaged in that a coupling feeding mode is employed, the excellent impedance characteristic of the antenna is realized, the antenna standing-wave ratio is improved, work band width of the antenna is enhanced, the structure is simple and compact, the profile is low, and the antenna is easy to process.

The invention relates to ear strap spot welding equipment of a mask production machine, relates to the field of mask machining, and aims to solve the problem that ear straps are only welded to the outer surfaces of masks and are prone to falling off. The ear strap spot welding equipment comprises an operation table and a mounting plate arranged on the operation table. The operation table is provided with a mask trepanning mechanism and two groups of symmetrically arranged ear strap wire feeding mechanisms, a wire pushing mechanism and a welding mechanism; each ear belt feeding mechanism comprises a pay-off rod, a plurality of wire guide wheels, a wire pressing groove, a wire pulling clamp, a wire shearing knife and two wire clamping claws, an ear strap wire released on the pay-off rod is wound outside the wire guide wheels and penetrates through the wire pressing groove, the wire pulling clamp is movably connected along the side vertically arranged on the wire pressing groove, and the wire pulling clamp is used for pulling the ear strap wire to extend; and the wire shearing knife is arranged between one thread clamping claw close to the thread pressing groove and the thread pressing groove. The ear strap spot welding equipment has the effects that the mask can be punched, the ear strap lines penetrate through the mask, and therefore the ear strap lines are welded to the two faces of the mask, welding is more stable, and falling is not likely to happen.

The invention discloses an independent suspension type front drive rear axle assembly. The two ends of a rear axle cross beam are welded and fixed to the lower portions of the inner sides of flange discs respectively. Rear shaft heads are fastened on the outer sides of the upper portions of the flange plates through bolts respectively. The distance between the center of each rear shaft head and the axis of the rear axle cross beam ranges from 130 mm to 160 mm. The rear shaft heads support rear wheel hubs, the rear wheel hubs are provided with shaft sleeves corresponding to the rear shaft heads, and paired single-row tapered roller bearings for bearing positive and reverse axial force are arranged between the shaft sleeves and the rear shaft heads. Locknuts in threaded connection with the rear shaft heads and gaskets of the locknuts are arranged at the ends of the rear shaft heads, the gaskets are jointed with the inner rings of the single-row tapered roller bearings on the outer sides, and stop cotter pins are arranged at the ends of the locknuts and the ends of the rear shaft head. The rear axle cross beam is a square steel pipe, brake discs are fixed to the inner sides of the rear wheel hubs, brake assemblies in friction joint with the brake discs are symmetrically arranged at the transverse front and back positions of the brake discs, and brakes are hydraulic drive brakes. The gravity center of a finished automobile is lowered, and the driving stability can be improved. The independent suspension type front drive rear axle assembly is more beneficial for the arrangement of electrical apparatus elements such as battery packs of purely electric large and medium buses and buses, and therefore the higher speed per hour and the larger endurance mileage can be achieved.

The invention belongs to the field of solar water heaters, and particularly relates to a heat preservation and protection system used in a solar water heater heat collecting system. A solar water heating system capable of performing high-temperature protection on a heat collector is improved from a common solar water heating system. An overheating protection system is further arranged in the solar water heating system and composed of a water inlet pipe (12), a protective solenoid valve (13), heat exchange U-pipes (14), another protective solenoid valve (15), a protective normally-closed solenoid valve (16) and a cold water use end (19), the water inlet pipe is connected with a tap water pipe, one protective solenoid valve is arranged in the water inlet pipe which is directly connected into a pipeline of the heat exchange U-pipes, an outlet of the heat exchange U-pipes passes the protective solenoid valve (15) to enter the cold water use end (19), and the heat exchange U-pipes are sinuous coils arranged in a hot water tank. The invention can provide a water heating system capable of automatically providing overheating protection when a flat-plate heat collector is subjected to high-temperature sun exposure.

The invention relates to the technical field of pipe gallery pipelines, in particular to a pipe gallery pipeline section prefabricating platform. The prefabricating platform comprises a supporting mechanism, an operating mechanism and a clamping mechanism, wherein the supporting mechanism comprises a bottom plate, first supporting columns are arranged on the periphery of the lower end of the bottom plate, the lower end of each first supporting column is provided with a moving wheel, a control switch is arranged on the outer side of one of the first supporting columns, and a welding rod cylinder is arranged on the outer side of one of the first supporting columns; the operating mechanism comprises a supporting seat connected with the bottom plate, the upper end of the supporting seat is connected with an operation table, and the the operation table and one side corresponding to the bottom plate are connected with an outer cover. According to the pipe gallery pipeline section prefabricating platform, the structure design is reasonable, the functionality is high, the height of the prefabricated platform can be effectively and quickly adjusted and fixed, the pipeline can be effectivelyclamped, welding is facilitated, and the welding smoke is effectively treated, so that the body health of workers can be conveniently protected.

Disclosed is a diamond grinding wheel with inclined teeth. The diamond grinding wheel comprises an annular mounting baseplate and multiple diamond tool bits fixed at the edge of the upper surface of the annular mounting baseplate, the diamond tool bits are arranged in the shape of a circular ring, a gap is formed between each two adjacent diamond tool bits, the diamond tool bits are distributed in a manner of radially inclining along the mounting baseplate, and each diamond tool bit is provided with acute-angle inclined teeth inclining towards one side on the radial inner side of the mounting baseplate 1 at least. Compared with flat-tooth diamond grinding wheels in the prior art, the diamond grinding wheel has higher grinding efficiency.

The invention relates to a novel connecting structure for a lower chord of a cargo boom, and belongs to the field of hoist machinery. The connecting structure comprises a front lower chord, a rear lower chord, a first joint, a second joint, connecting plates and a pin shaft assembly; the first joint is arranged at the right end of the front lower chord, the second joint is arranged at the left endof the rear lower chord, and the first joint is connected with the second joint in a crossed matching mode; the connecting plates are connected with the first joint and the second joint through the pin shaft assembly, and each of the first joint and the second joint comprises an inserting rod, a bottom plate and clamping plates; the inserting rods are correspondingly matched with the front lowerchord and the rear lower chord, the inserting rods are located on one sides of the bottom plates, and at least two clamping plates are evenly arranged on the other side of each bottom plate at intervals. According to the connecting structure, the structural design is simple and reasonable, installation and welding are convenient, the connection is firm and reliable, the structural strength of thelower chord of the cargo boom is effectively improved, the service life of the cargo boom is prolonged, and the safety and the stability of the hoisting machinery operation are improved.

The invention discloses square tube welding equipment. The square tube welding equipment comprises a supporting box body which is internally provided with an inner installation cavity through from left to right; a through inner cavity is formed in the upper end wall of the inner installation cavity in a communication mode; the inner installation cavity is internally provided with a bottom tube anda top tube perpendicular to the bottom tube; the bottom tube is internally provided with a clamping matched surface having an opening, the clamping matched surface is a triangular opening, the bottomtube abuts against the top tube, and the outer side of the bottom tube is provided with a linkage placement device used for conducting clamping linkage placement on the bottom tube; the equipment needs to driven an inner structure, the top tube is placed into the clamping matched surface, moreover, the top tube is completely flush with the bottom tube, and after a laser welding head works, the clamping matched surface is subjected to laser welding.

The invention discloses a galvanized composite board, and relates to the technical field of composite boards. The galvanized composite board is prepared by the following process flows: A, firstly, washing with water and then drying to 100 DEG C; B, bonding an aluminum board and a galvanized board through a high-temperature polymer bonding material; C, high-temperature extrusion: firstly, using an electromagnetic heating tube for rolling to 270 DEG C, and then heating and extruding five times, wherein the heating and extruding temperatures five times are respectively 170 DEG C, 190 DEG C, 210 DEG C, 230 DEG C and 270 DEG C; D, cooling: using processed purified water for cooling to 40 DEG C, and then using a fan for cold-blowing to 20 DEG C; E, finally, flattening. The galvanized composite board provided by the invention is reasonable in structure design, simple in process, durable, low in cost, high in strength, free from baking finish, environment-friendly, and convenient and reliable in mounting and welding.