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 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 relates to a mounting method for a large movable ramp. The method comprises the following steps that the movable ramp and a hull structure are measured; a lap joint tool is welded to the movable ramp, and the ramp is in lap joint with an opening of the structure; a centre drawer hinge bracket connected with a hull is assembled; the position of the movable ramp is determined, after other accessories are mounted and positioned, the gap between the ramp and a supporting base is measured, and an adjusting gasket is machined; and the movable ramp is hoisted, a lap joint plate is in lap joint with a round pipe, repair welding is conducted on a blind spot in hinge welding, the ramp is started, and the adjusting gasket is welded. Through the method, the ramp can be mounted with high precision, and the special tool is used so that the lap joint requirement can be met and movable adjustment can be achieved during adjustment. Labor intensity is relieved, and meanwhile mounting quality is improved.

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.

The invention provides a clearance adjustment device for a differential lock. The clearance adjustment device is used for adjusting the clearance between a sliding engaging sleeve and a fixed engaging sleeve of the differential lock, and comprises a dial, a rotating sleeve and a pointer, wherein the dial is matched with the rotating sleeve; the rotating sleeve can be matched with a rotating shaft driving the sliding engaging sleeve to move and can rotate relative to the dial along with the rotation of the rotating shaft; the pointer is fixed on the rotating sleeve and can rotate relative to the dial along with the rotation of the rotating sleeve; and the rotating angle of the pointer can be displayed on the scale of the dial. The invention further provides a clearance adjustment method for the differential lock and a method for adjusting the clearance of the differential lock by utilizing the clearance adjustment device. Through the technical scheme provided by the invention, the clearance between the sliding engaging sleeve and the fixed engaging sleeve of the differential lock can meet the design requirement and be irrelevant to the stroke error of a cylinder, so that the differential lock can work normally.

The invention relates to a repair method and device of a welding defect of inner hole welding in a U-shaped pipe type heat exchanger. The repair method uses a designed repair device to completely remove an inner hole welding line generating the defects, and form a new inner hole welding groove in a pipe plate, an original U-shaped heat exchange pipe is drawn out and replaced with a new U-shaped heat exchange pipe is replaced, and inner hole welding is carried out on the new U-shaped heat exchange pipe and a pipe plate set again, the repair device comprises a height fixing nut, a cushion block,a positioning ring, a push rod, a shaft sleeve, a pin shaft and a cutting blade, according to the repair method and device of the welding defect of inner hole welding in the U-shaped pipe type heat exchanger, the phenomenon that after a defect appears in an inner hole welding line at present, a manner of blocking a pipe hole of a pipe plate is only adopted for repair can be avoided thoroughly, the inner hole welding line maintainability is greatly improved, and the large-scale application of the inner hole welding technology can be greatly promoted.

The invention discloses a motorcycle and an after-frame assembly thereof. The after-frame assembly of the motorcycle comprises a seat cushion loctal base, a rear fender board, a rear carrying rack, a tail cover, frame tail pipes and a connecting plate, wherein two frame tail pipes are parallel along a transverse direction; the connecting plate is laid between the two frame tail pipes and fixedly connected with the two frame tail pipes; and the seat cushion loctal base, the rear fender board, the rear carrying rack and the tail cover are all detachably and fixedly connected with the connectingplate. The after-frame assembly disclosed by the invention realizes the standardized installation of the seat cushion loctal base, the rear fender board, the rear carrying rack and the tail cover, isbeneficial to ensuring the assembling gaps among parts and the installation dimensions among the parts and preventing the interference among the parts and has the characteristics of standardization and high generality; in addition, the after-frame assembly disclosed by the invention has larger size relative to the prior art by adopting a connecting piece structure and has good firmness without deforming the connecting piece when used for a long time, thereby ensuring the integral appearance of the motorcycle.

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 and an anti-dust ring, wherein a bushing is arranged out of the bearing bush in a sleeving manner; the shaft is arranged in the bearing bush in a penetrating 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; a concave pit is formed in the inner end surface of each of the left floating sealing seat and the right floating sealing seat; end heads of the bushing are embedded into the concave pits; each embedding gap is a zigzag gap channel; 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 good; 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 a testing auxiliary tool and a testing method for a matching clearance of B column cover plates of car doors. The testing auxiliary tool comprises a base, fixed positioning pins and a movable positioning pin, wherein the fixed positioning pins and the movable positioning pin are arranged on the base. The movable positioning pins are pluggable. The testing auxiliary tool matches a positioning hole on B column wind frame reinforcing plates of a front car door and a back car door through the fixed positioning pins and the movable positioning pin, thereby testing whether the matching clearance between the B column cover plates of the front car door and the back front car door is qualified. The base body has an inverse-F-shaped structure. The upper end and the lower endof the inverse-F-shaped structure are respectively provided with a fixed positioning pin. A third fixed positioning pin is arranged at the upper part of the inverse-F-shaped structure through a connecting block II. The movable positioning pin is arranged outside the lower cross bar of the inverse-F-shaped structure through a connecting block I. The testing auxiliary tool and the testing method ensures high consistency of the matching clearance of the B column cover plates of the car doors, and furthermore reduces reworking of the B column cover plates by employees.

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.

An integral molding die for a motor internal insulation layer and a molding process. The die includes the following parts: an upper die body half piece and a lower die body half piece, which cooperate for usage; a mandrel assembly, which comprises a die body, and a front screw thread connection shaft and a rear screw thread connection shaft, welded to the front end and the rear end of the die body; a tail forming ring, which is in screw joint with the rear screw thread connection shaft of the mandrel assembly; a head blanking cap, which is in screw joint with the front screw thread connection shaft of the mandrel assembly; and a positioning and draft tool, which is in screw joint with the front screw thread connection shaft of the mandrel assembly. The invention makes the structure size and precision of an insulation layer preform meet the design requirements, and in the premise of satisfying the structure reliability, the invention reducing the negative quality of thermal protection.

The invention relates to an installation method for an annular welding base plate. The installation method is achieved through a special tool, it can be ensured that the annular welding base plate is positioned and fixed when the annular welding base plate and a pipe type cross beam are in a concentric state, and welding and assembling operation of the annular welding base plate is completed. By means of the installation method, the problem that a traditional pipe type cross beam and box type side beam assembling process is low in efficiency is solved, assembling of the pipe type cross beam and the box type side beam can be rapidly achieved, and an assembling gap of an annular weld seam is guaranteed. By matching the device positioning hole diameter, the installation method can be widely applied to production of assembling structures of pipe type cross beams with different pipe diameters and box type side beams.

The invention provides an anti-abrasion floating aluminum alloy bearing pedestal which comprises a bearing pedestal which is in clearance fit with a gear hole, wherein two symmetric apertures are poured in the bearing pedestal; the whole bearing pedestal is 8-shaped; matched composite linings are arranged on the apertures; a 3-shaped sealing ring slot is arranged in one end face of the bearing pedestal in a sunken manner; an unloading slot is arranged in the other end face of the bearing pedestal. Due to the design of the unloading slot, a phenomenon of oil trapping during the meshing of a gear can be reduced; furthermore, the unloading slot can be used for lubricating the composite linings, so that the abrasion degree is reduced; moreover, due to the design of the end face sealing ring slot, oil in a certain region on the end face of the bearing pedestal can be pressed to push the aluminum alloy bearing pedestal to get close to the end face of the gear, and leakage of the oil pressing end face is prevented; due to an aluminum alloy material for making proportional materials and a technology and a manufacturing technology, the anti-abrasion floating aluminum alloy bearing pedestal is high in abrasion resistance and high in intensity.

The invention provides a differential lock gap adjustment device, which is used for adjusting the gap between a sliding engagement sleeve and a fixed engagement sleeve of a differential lock, comprising a dial, a rotary sleeve and a pointer; the dial is matched with the rotary sleeve, The rotating sleeve can cooperate with the rotating shaft that drives the sliding engagement sleeve to move, and can rotate relative to the dial with the rotation of the rotating shaft; the pointer is fixed on the rotating sleeve and can move with the rotating sleeve The rotation of the pointer rotates relative to the dial, and the rotation angle of the pointer can be displayed on the scale of the dial. The invention also provides a method for adjusting the differential lock clearance and a method for adjusting the differential lock clearance by using the differential lock clearance adjustment device. Through the technical solution provided by the invention, the gap between the sliding engagement sleeve and the fixed engagement sleeve of the differential lock can be guaranteed to meet the design requirements, regardless of the stroke error of the cylinder, so that the differential lock can work normally.

The invention discloses an engine compartment cover device, comprising a frame and a first profile block, wherein the frame is matched with the upper contour of the engine compartment, and the lower part of the frame is provided with symmetrical mounting holes for matching with the left and right suspension mounting holes of the engine compartment respectively The upper part of the front end of the frame is provided with symmetrical second positioning pins for matching with the two positioning holes on the engine compartment cover, and there are at least four first profile blocks, which are symmetrically distributed on the frame. On both sides of the hood, the inner surface of the first profile block is attached to the side of the engine compartment cover to control the assembly gap between the engine compartment cover and the fender, and the structure is simple and easy to operate; the invention also discloses a The fender mount of the engine compartment cover mount can simultaneously position the engine compartment cover, the fender and the front door, and ensure the assembly gap between the engine compartment cover and the fender and between the fender and the front door.