36results about How to "Guaranteed assembly clearance" patented technology

The invention belongs to the technical field of electron beam welding, and particularly relates to an electron beam welding method for multiple small-diameter flange plates at different circumferential positions of a large-size thin-wall space curved face top cover. A flange plate structure applicable to top cover flange plate electron beam welding is designed, a welding joint portion of each flange plate is of a butt joint lock bottom structure, and assembling precision and welding quality are effectively ensured. Meanwhile, according to the hole size in the position, to which each flange plate is assembled and welded, on the top cover, the diameter of the welding face of the corresponding flange plate is adjusted, and it is ensured that the assembling gap between the corresponding flange plate and the top cover meets welding requirements. By using a tool, by the adoption of elastic prestress deformation, welding stress is counteracted, deformation is reduced, electron beam welding for the flange plates distributed at different positions of the space curved face top cover is achieved, and satisfying welding quality is obtained.

The invention discloses a cooking pot used for steam heating and a steam heating type cooking utensil, which belongs to the field of kitchen appliances and solves the problem of inconvenient cleaning of the lid of the cooking pot in the prior art. The cooking pot of the present invention includes a pot A body and a pot cover, the pot cover includes an outer cover and an inner cover, the outer cover is covered on the pot edge of the pot body, the inner cover cooperates with the pot body to form a cooking cavity, and the cooking pot The appliance further includes a steam conduit, a protruding air inlet joint is arranged on the inner side of the outer cover, the air inlet joint penetrates the inner cover, and the steam conduit is detachably mounted on the air inlet joint and positioned axially the inner cover. The present invention adopts a detachable inner cover design, so that the inner cover can be cleaned separately.

The invention discloses an assembly welding tool of a high-precision frame structure. The assembly welding tool comprises two clamping plates used pairwise, four pressing plates and a pull rod. The four pressing plates are divided into two sets; and the two sets of pressing plates are fixedly connected with wedged blocks on the two clamping plates through an inserting mode, and are positioned on the two sides of the two clamping plates. The middle part of the pull rod and one end of the pull rod are mounted in through holes in the geometric centers of the two clamping plates, and are fastenedthrough nuts; and the pull rod and the through holes of the clamping plates are in interference fit. The other end of the pull rod is positioned out of the clamping plate on the side, and is used forfixedly connecting with a chuck of a vacuum electronic beam welding machine. The assembly welding tool is used for a vacuum electronic beam welding assembly chassis, guarantees the alignment tolerance, controls the welding deformation and the frame rotation, can guarantee the welding line alignment tolerance, constrains a whole frame, and prevents deformation of the frame in the welding process; and meanwhile, the tool enables the frame to rotate, so that all welding lines can be welded under vacuum of the same furnace, and the welding efficiency and quality are improved.

The invention discloses an escalator floor board supporting structure which comprises a supporting frame, a locking support, supporting bolts and displacement bolts. The supporting frame comprises a vertical face and a transverse face. The transverse face comprises a supporting face and a water collecting groove. A water drainage hole is formed in the bottom of the water collecting groove. A T-shaped groove is formed in the back of the supporting face. The locking support is provided with a supporting hole and a displacement hole. Heads of the displacement bolts are arranged in the transverseportion of the T-shaped groove, and screws of the displacement bolts penetrate through the T-shaped groove and the displacement hole to fix the locking support and the supporting frame to the displacement bolts. Heads of the supporting bolts are used for being supported on the bottom face of the T-shaped groove, and screws of the supporting bolts are used for penetrating through the supporting hole of the locking support to fix the locking support into a bolt hole of an escalator truss in a bolt manner. The invention further discloses a supporting frame. The structure can have functions of supporting a floor board and collecting and draining water, the structure is concise and high in waterproof function, adjustment of the supporting frame in the height direction and rotation in the planeof the floor board are facilitated, the error can be made up, the assembling clearance is ensured, the assembling efficiency is high, and the error-tolerant rate is high.

The invention provides a working device hinging mechanism, and relates to the technical field of engineering machinery. The working device hinging mechanism comprises a bearing bush, a shaft which is arranged in the bearing bush in a penetrating manner and an anti-dust ring, wherein a bushing is arranged out of the bearing bush in a sleeving manner; a left floating sealing seat and a right floating sealing seat are respectively connected with the two ends of the shaft in a sleeving manner; a first floating oil sealing cavity is formed in a contact surface between the bushing and the left floating sealing seat; a second floating oil sealing cavity is formed in a contact surface between the bushing and the right left floating sealing seat; the first floating oil sealing cavity and the second floating oil sealing cavity are communicated with the shaft; a floating oil seal is arranged in each floating oil sealing cavity; at least one shaft oil channel is formed in the surface of the shaft in a shaft length direction; the shaft oil channel is communicated with the first floating oil sealing cavity; compared with the prior art, the floating oil seals of the working device hinging mechanism form static seal; when the floating oil seals are in contact with each other and are rotated, dynamic end surface seal is formed; small particles do not enter the space between the shaft and a shaft sleeve easily, and an anti-dust effect is very good, so that the adhesive wear and the abrasive wear of a bearing can be reduced; the work reliability of a sliding bearing mechanism can be improved.

The invention relates to the field of coolers, in particular to an exhaust gas recirculation (EGR) cooler core body and belongs to a constituent part of an EGR cooler suitable for exhaust gas recirculation in an automobile engine system. The EGR cooler core body comprises an upper fixing plate and a lower fixing plate. Two ends of a threaded tube are respectively fixed in through holes of the upper fixing plate and the lower fixing plate, a guide plate is fixed on the threaded tube, one end of the threaded tube fixed on the upper fixing plate is provided with a flaring structure, one end of the threaded tube fixed on the lower fixing plate is provided with a necking structure, the diameter of the flaring structure of the threaded tube is larger than that of the through hole of the upper fixing plate, and the diameter of the necking structure of the threaded tube is smaller than that of the through hole of the lower fixing plate. The threaded tube is installed into the upper fixing plate through external force, the other end of the threaded tube is necked, and guiding in the assembly process is facilitated. Therefore, interference fit between the flaring end of the threaded tube and the upper fixing plate and between the necking end of the threaded tube and the lower fixing plate is formed.

The invention discloses a manufacturing method of a blade for a centrifugal aeration blower diffuser and a positioning tool for the same. The manufacturing method sequentially comprises the following machining procedures of: 1), roughly milling four sides of the blade and a process lug; 2), carrying out finish milling on the molded line of the blade; 3), adopting the positioning tool, carrying out wire-electrode cutting to remove the process lug; 4), grinding the top surface of the blade; 5), adopting the positioning tool, beneficially turning a positioning shaft by a turning lathe and cutting off the end surface of the process lug; 6), trimming and turning an overlap by a bench worker and milling a knuckle radius between two molded lines at two ends of the blade; 7), mounting a turning tool to drill a threaded bottom hole; 8), tapping and removing burrs by the bench worker; and 9), carrying out comprehensive detection. The manufacturing method and the positioning tool have the advantages that the procedures are arranged reasonably, and the machining quality and the machining efficiency can be effectively improved.