38results about How to "Increased solder contact area" patented technology

The invention discloses a welding method for an electrode used for consumable vacuum arc melting. The method relates to: lathing two ends of an upper part electrode and a lower part electrode that are butt welded; processing the welding end of the upper part electrode into a lug boss; processing the welding end of the lower part electrode into a groove; arranging the processed upper part electrode into a consumable vacuum arc furnace with the lug boss facing downwards; arranging the lower part electrode in a pot in the consumable vacuum arc furnace and locating with the groove surface facing upwards; arranging an arc striking material on a salient part at the core part of the lower part electrode, sealing the consumable vacuum arc furnace and welding after cacuumizing. The invention has a simple structure and a good centering effect between the upper part electrode and the lower part electrode; and when welding, an alloy liquor filling groove melted by arc starting can not overflow to the circle surface of the electrode, thus avoiding crack, 'nuble' or scrap rubber at the location of a welding line; thereby ensuring the welding quality. The welding contact area is large and can not generate rosin joint; the electrode after welded is firm and can avoid falling off when melting.

The invention relates to the technical field of PCB circuit repair, and specifically discloses a circuit repair method for a high-precision circuit PCB. The circuit repair method comprises the following steps: increasing the contact area of the to-be-repaired circuit surface of the PCB and a repair gold wire; welding the repair gold wire to the to-be-repaired circuit surface of the PCB, and synthesizing a wire repair plate; applying pressure to the surface of the repair gold wire of the wire repair plate; extracting by using a first preset sampling proportion to complete AOI scanning for the repair wire plate in the previous step, and detecting whether the repair gold wire falls or not so as to increase the coarsening degree in the first step and / or increase the pressure applied in the third step. The circuit repair method has the obvious advantages that the to-be-repaired circuit surface and the surface of the gold wire are coarsened, so that the welding contact area of the gold wireand the circuit is increased, the resistance at the welding position can be reduced effectively, the electrification heat productivity is reduced, and the reliability of the product when in use is improved; the circuit and the surface of the gold wire are coarsened, the binding force between the gold wire and the circuit is improved, the gold wire is prevented from falling off in the subsequent procedure, and the internal proportion of the product is reduced.

The invention discloses a manufacturing method of a surface mounting capacitor for enhancing weldability; laminated metal films are clamped together by adopting a special tooling, metal is sprayed on the side end surface of the laminated metal films, so as to lead the upper and lower ends of a metal spraying layer formed by spraying the metal on the side end surface of the laminated metal films to be respectively provided with an upward bulge and a downward bulge which is symmetrical with the upward bulge along the horizontal direction; a sunk part is arranged on the special tooling, the sunkdepth of the sunk part is 0.07-0.13mm, the inner end of the sunk part is an inclined surface, the inclined surface and the sunk surface of the sunk part and the normal surface of the tooling are connected smoothly, the inclined surface of the sunk part and the normal surface of the tooling form an included angle with 30-50 degrees; by adopting the special tooling, the upper and lower end surfacesof the metal spraying layer at two ends of the laminated metal films are bulged, the welding contact area is increased, the welding reliability is ensured, and the probability of insufficient weldingand tomb stone and the like of the surface mounting capacitor is greatly reduced.

The invention discloses a manual efficient corn planter which comprises a rack, seeders and trench openers, wherein the rack comprises a horizontal support rod and a vertical support rod; the vertical support rod is arranged at the end part of the horizontal support rod; the horizontal support rod is connected with the seeders; a handheld handle which is horizontally arranged is arranged on the upper side of the vertical support rod; seed falling control plates which are arranged in a downwards inclining manner in match are arranged on the inner sides of the lower parts of the trench openers; the control plates are connected with a control handle through a transmission mechanism; the control handle is connected with the handheld handle; the seeders comprise falling tubes; the falling tubes are connected with the horizontal support rod; the upper parts of the falling tubes are connected with seed funnels; the bottoms of the falling tubes are connected with the trench openers. As a plurality of independent main body parts of a planter are connected and used together, a plurality of trenches can be formed at one time through the mass of the planter self, the distances among plants are uniform, components and parts can be conveniently adjusted and replaced, the production efficiency is high, and the manual efficient corn planter is particularly applicable to experimental planting of novel corn varieties.

The invention provides a high-voltage transformer. The high-voltage transformer is characterized by comprising a tank cover, an upper-section oil tank and a lower-section oil tank, which are mounted together from top to bottom, wherein a sealed oil tank space is formed by the tank cover, the upper-section oil tank and the lower-section oil tank; the upper-section oil tank is internally provided with a coil; the coil is mounted on an iron core; clamping parts are mounted at the upper and lower ends of the iron core; the lower-section oil tank is provided with a plurality of jack mounting positions; the tank cover is provided with a wiring terminal connected with the coil; and an oil pillow for supplementing oil to the oil tank is mounted on the right side of the tank cover. The high-voltage transformer has the beneficial effects of complete functions, convenience for assembling and long service life.

The invention relates to a tunnel primary support steel arch frame lock foot fixing method. The method comprises the following steps that 1, a seamless steel pipe is machined to be the fixed length, one end of the seamless steel pipe is machined to be sharp, the other end of the seamless steel pipe is machined to be an oblique angle of 30 degrees, grouting holes are formed in the pipe wall in the shape of quincunx, and then a locking anchor pipe is obtained; 2, a positioning plate is adopted for machining a pair of square steel frame positioning holes on a web of a profile steel frame; 3, screw-thread steel is adopted for being prepared into U-shaped clamp rings; 4, a drill pipe drills holes in the direction of steel frame positioning holes, and after the holes reach the designed depth, installation is conducted in place; 5, the two U-shaped clamp rings oppositely penetrate through the steel frame positioning holes and are clamped on the locking anchor pipe, and U-shaped clamp ring arc welding connection surface, the locking anchor pipe and a U-shaped clamp ring arc welding connection surface are formed through welding separately; 6, grouting is conducted after connection of a grouting pipe and the locking anchor pipe, and finally a grout stop valve is installed. Accordingly, the fixation of the locking anchor pipe on the tunnel primary support section steel arch frame can be effectively improved, tunnel primary support sinking and deformation are prevented, and the safety factor of tunnel construction is strengthened.

The invention provides a vehicle-mounted loop antenna apparatus and a manufacturing method thereof. The apparatus comprises an antenna oscillator, an antenna base and a high frequency connector, wherein the antenna oscillator and the high frequency connector are installed on the antenna base; the antenna oscillator comprises a metal ring, a short welding foot and a long welding foot; the high frequency connector comprises a high frequency connector socket welding needle, a high frequency connector flange plate and the like; and the short welding foot of the antenna oscillator and the high frequency connector socket welding needle are overlapped, are wound firmly through a bare copper wire and then are welded. The vehicle-mounted loop antenna apparatus is characterized by further comprising a plurality of welding sheets. One end of each welding sheet is fixed to the high frequency connector flange plate; the non-fixed end of each welding sheet is bent by an angle of 90 degrees towards the direction of the antenna oscillator; the distances between the bending parts of the welding sheets are the diameter of a antenna oscillator material; and the long welding foot of the antenna oscillator is inserted to the vertically bent butt joint position of the rail ends of the welding sheets and is firmly connected with the high frequency connector flange plate in a welding mode. The apparatus and the method provided by the invention solve the problems of easy unsoldering, antenna swinging and the like caused by unfavorable environments of vibration and impact of an external environment and the like during a use process of a conventional vehicle-mounted antenna.

The invention provides a cylindrical battery with a conical surface seal. The pole group is placed in a steel shell, the steel shell is filled with electrolyte, the sealing ring is set in the steel shell, and the sealing structure is set in the sealing ring. The steel shell The upper end, the corresponding sealing ring, and the side wall of the sealing structure are extruded inward together to form an extruded part whose lower end is an inwardly inclined slope and the upper end is a vertical straight line. ° Bending tightly wraps the top of the steel shell to form a sealing part, the bottom of the sealing structural part is welded together with the upward end of the pole group, the periphery of the base plate of the sealing upper cover plate is welded on the bottom of the sealing structural part, and the safety valve is placed on In the space formed between the sealing upper cover plate and the sealing structure, the downward end of the pole group is welded together with the bottom of the steel shell. A method for preparing the battery of the invention is also provided. The battery of the invention has novel structure, low internal resistance, low cost, good sealing strength and simplified preparation process.