112results about How to "Reduce assembly clearance" patented technology

The invention discloses a housing case flanger, which comprises an axial feed mechanism, a main shaft box, a clamp device and a rotary pressing device, wherein the clamp device is fixed to the axial feed mechanism; and the rotary pressing device is in transmission connection with the main shaft box. The use method of the housing case flanger comprises the steps of fixing a housing case, rotary pressing a horn mouth, rotary pressing a right-angle side and the like. The housing case flanger and the use method thereof are adopted; through the autorotation of main rotating wheels and auxiliary rotating wheels and the rotation of a turnplate, a horn side and a right-angle side flange of the housing case are subjected to rotary pressing; since the clamp device which internally expands and externally holds is used for fixing the housing case, and the clamp device has an automatic centring rounding function, a necking-down phenomenon cannot happen to an opening of the housing case in the rotary pressing process, an assembling clearance between the impeller outer diameter of a draught fan which is finally assembled and the inner wall of the housing case can be reduced, and the aerodynamic performance and the efficiency of the draught fan are improved.

The invention discloses a multi-constraint-condition aircraft skin attitude adjustment method and system. The method comprises the steps: acquiring related position data of a skeleton and inner and outer sides of an assembled skin/a to-be-assembled skin; processing the data to obtain a feature hole position on the to-be-assembled skin, a feature hole position on the skeleton, an outer side surfacetype of the skeleton, an inner side surface type point cloud of the to-be-assembled skin and an outer side contour point set of the to-be-assembled skin; calculating a pose solution set of the to-be-assembled skin under the condition of meeting a tolerance threshold by using the point cloud; enabling the point set to be in the pose solution set, and calculating a sub-solution set, under the condition of meeting a tolerance threshold, of the to-be-assembled skin; calculating an optimal pose solution with an infinitely small assembly gap in the sub-solution set by utilizing the positions of thefeature holes, the inner side point cloud and the point sets of the outer side contour of the to-be-assembled skin; and judging whether the optimal pose solution exists or not, if so, carrying out apose adjustment process according to the solution, otherwise, expanding a tolerance threshold, and iterating the process until the solution exists. With the method, the docking task requirement can bemet on the premise of multi-tolerance constraint.

The present invention discloses a shell assembling device for assembling a shell having a first cover and a second cover, the shell assembling device comprising: a plurality of rigid fitting structures provided on the first cover and second cover, and a plurality of elastic interference fitting structures provided on the first cover and second cover.

The invention discloses an assembling and disassembling structure for a main machine and a cutter rest and a handheld tool. The assembling and disassembling structure for the main machine and the cutter rest comprises a main shell and an auxiliary shell detachably connected with the main shell. The auxiliary shell achieves rapid locking and unlocking with the main shell through matching between alocking ring, multiple lock buckles and a drive ring in the main shell and a locking groove on the auxiliary shell. By manually rotating the drive ring, the multiple lock buckles can be driven to switch between a third position and a fourth position; when the lock buckles are located at the third position, the lock buckles are embedded into the locking groove of the auxiliary shell to achieve locking; and when the lock buckles are located at the fourth position, the lock buckles retreat from the locking groove, and then locking of the auxiliary shell can be eliminated, and disassembly can be conducted. The assembling and disassembling structure adopts a rotary knob type unlocking structure, during unlocking, the situation that pressing is conducted hard to enable an elastic hoop to expandis not needed, and operation is easy; by the adoption of the assembling and disassembling structure for the main machine and the cutter rest, during installation, it is just needed to insert the auxiliary shell, pressing a button is not needed, the requirement for a user is low, and operation is convenient; and the locking stability of the assembling and disassembling structure for the main machine and the cutter rest is good.

The invention provides an automobile gearshift, and belongs to the technical field of automobiles. The automobile gearshift comprises a base, a cover circle, a rotating central ball, an operating rod and a gear selection arm. The base is provided with a first shaft hole and a ball seat hole, the gear selection arm is provided with a second gear shaft hole and a spherical shaft hole, the rotating central ball is fixedly provided with a first spherical pin, the cover circle is embedded in the ball seat hole, the rotating central ball is arranged in the cover circle in a rotatable mode, the gear selection arm is fixedly connected with the rotating central ball through the spherical shaft hole and the first spherical pin, the gear selection arm is linked with the base through a shaft, the operating rod is fixedly and longitudinally connected to the rotating central ball, the rotating central ball is a ball body formed by a first semi-ball and a second semi-ball, the spherical surface of the first semi-ball and the spherical surface of the second semi-ball are provided with scrap edge portions respectively, the scrap edge portions are arranged at the equipment joints of the first semi-ball and the second semi-ball, and each scrap edge portion is a circular ring with the outer diameter equal to the outer diameter of the corresponding semi-ball and the inner diameter slightly smaller than the outer diameter of the corresponding semi-ball. The automobile gearshift has the advantages of being high in safety performance and low in noise.

The invention provides an assembly type truss formwork support, belongs to the technical field of construction, and particularly relates to a truss and a support which are used for construction. The truss is obtained by assembling one-meter single-rod units, I type truss units (one meter), II type truss units (two meters) and end rods through shaping truss units with end plates by means of bolt connection joints instead of assembling existing single rods. Upper chords, lower chords and inclined supports of all the truss units are connected through welding, the end plates with bolt holes are adopted for the ends of the truss units, the truss units are connected through bolts, different spans of trusses can be formed after assembly, the end rods are additionally arranged at the ends of the assembly truss, vertical supports are additionally arranged on the end rods, and the assembly type truss formwork support is formed. The assembly type truss formwork support is obtained by connecting and assembling the end plate shaping truss units with the bolt holes through the bolts, the number of splicing times is reduced, and therefore the rigidity of the trusses is ensured, web member eccentric influences and assembly gaps are reduced, the vertical deflection is reduced, and the bearing capacity is improved. All the truss units are assembled through the connection plate joints with the bolt holes, and different spans of trusses can be obtained after assembly.

The invention relates to the field of fenders, in particular to a plug-in type fender structure. The plug-in type fender structure comprises a fender body; the fender body comprises a connecting partconnected with a front bumper; the connecting part comprises a connecting end plate arranged on the side surface of the connecting end of the fender body and the front bumper; and the connecting end plate is connected with the end part of the front bumper through a plug pin. The invention discloses the plug-in type fender structure; through the arranging of the plug pin, the clamping type connecting mode adopted between a traditional fender and the front bumper is changed; through cooperation of the plug pin and a bolt, the fender and the front bumper can be fixed after being positioned to bebeneficial for improving the assembling precision of the fender and the front bumper, reducing the assembling clearance between the fender and the front bumper and preferably satisfying actual production demands; and meanwhile, by arranging a reinforcing mechanism, the connecting strength between the fender and the front bumper is enhanced so that the connecting stability of the fender and the front bumper is preferably guaranteed.

The invention relates to an improvement technology of a refrigeration compressor, in particular to a reinforced inner support structure for the refrigeration compressor. The reinforced inner support structure for the refrigeration compressor comprises a stator, a rotor, a cylinder base mounted above the stator and a crankshaft inserted between the cylinder base and the rotor; a counter bore is formed in the middle part of the cylinder base; a bearing A is mounted to form rotational bearing for the upper end of the crankshaft. The reinforced inner support structure for the refrigeration compressor is characterized in that a bracket is additionally arranged below the stator; left and right bolt holes are formed in the bracket, and the bracket is in threaded connection with the cylinder base by enabling bolts to pass through the bolt holes in the bracket and bolt holes in the stator; a boss is formed at the middle part of the bracket; a bearing hole is formed in the upper part of the boss for mounting a bearing B; an oil suction pipe assembly vortex cavity is formed in the lower part of the boss; the bearing B and the lower end of the crankshaft are assembled to form a rotational bearing. The reinforced inner support structure for the refrigeration compressor, which is disclosed by the invention, solves the problems of low working efficiency of an existing compressor and the like, which are caused by the case that a crankshaft and rotor assembly is supported and positioned by a stator inner hole and a single-point cantilever, the compressor works unstably, a gap between a stator and a rotor is large and an operation electrical air gap is unstable, and is mainly applicable to refrigeration equipment such as a refrigerator, a freezer and the like.

The invention discloses a laser welding clamp for a T-shaped structural component, and the T-shaped structural component comprises an envelope and a stringer, the laser welding clamp comprises a bottom plate for supporting the envelope; a pressing bar which is used to press the envelope such that the envelope is tightly close to the bottom plate; a corner-bending pressing block which is respectively arranged on both ends of each stringer, one end of the corner-bending pressing block is connected with the stringer while the other end thereof is connected with the bottom plate. The laser welding clamp can effectively control deflection deformation of the stringer and restrain generation and extension of solidification cracks at laser welding end points.

The invention discloses a one-side welding and one-side forming welding method for MAG faced-up butt joint. A MAG solid welding wire is adopted for carrying out faced-up butt joint welding on a platewith grooves, and the assembly clearance of the grooves ranges from 1.5 mm to 2.5 mm. The method comprises the steps that a bottoming layer, a filling layer and a capping layer are welded; in the welding process of the bottoming layer, the tilting angle between a welding gun and the welding direction ranges from 90 degrees to 100 degrees, through arc force, the root faces are broken down in the thickness direction of the plate, part of molten liquid in melting pools is jacked to the back faces of the grooves, and the melting pools are formed on the grooves and the back faces of the grooves; and after weld seams on the grooves in front of the melting pools are broken down, constant-speed pushing is kept in the welding direction when no melting hole is formed in the grooves in front of the melting pools, and welding of the bottoming layer is completed. The welding gun angle and the operation method are changed by reducing the workpiece assembly clearance, melting holes do not need to beformed in the roots of the grooves in front of the weld seam melting pools, and one-side welding and one-side forming of weld seams can be achieved.

The invention discloses a triangular beam flexible constraint variable stiffness micro-nano measuring head, which comprises a moving platform, wherein the moving platform is in the shape of a truncated cone, one side of the moving platform is provided with a measuring component, the measuring component is connected with the moving platform by means of a measuring and supporting structure, the center of the measuring and supporting structure is coaxial with a circle center of the measuring component, a plurality of reflecting sheets are fixedly mounted on the measuring and supporting structure,the other side of the moving platform is provided with a plurality of interferometers corresponding to the reflecting sheets, and penetrating holes are formed in the moving platform at positions corresponding to the reflecting sheets; one end of the measuring and supporting structure is connected with the measuring component, the other end is connected with a piezoelectric stacker by means of flexible adjusting members, and the flexible adjusting members are distributed in a triangle under the moving platform; and a gap is formed between the top part of the measuring component and the bottomsurface of the moving platform. The triangular beam flexible constraint variable stiffness micro-nano measuring head can change the stiffness of the measuring component by adjusting different operating states of the piezoelectric stacker, and can satisfy requirements for different stiffness of the measuring component due to different measuring processes and measuring objects.

The invention discloses a low-noise food processor. The low-noise food processor comprises a machine base with a motor, a stirring cup connected with the machine base and a pulverizing cutter arrangedin the stirring cup. A fan is arranged at the lower end of a motor shaft of the motor; the machine base is provided with an air inlet and an air outlet. The air outlet is positioned on one side belowthe machine base; the machine base comprises a machine shell, a top cover and a bottom cover. A motor cylinder used for containing a motor is arranged in the machine shell. A motor support is arranged at the upper end of the motor, the motor support is mounted at the top of the motor barrel; a shaft hole through which the upper end of the motor shaft penetrates is formed in the center of the motor support; the motor support is provided with a communication port communicated with the interior of the machine shell. The top cover is provided with a wind scooper; the wind scooper stretches into the machine shell and covers the upper portion of the motor support. When the motor works, the fan is driven to rotate, so that external air enters the machine shell from the air inlet and flows into the motor barrel through the communicating opening after being guided by the a wind scooper, and the wind scooper can play a role in guiding airflow and can prevent noise generated in the working process of the motor from being exhausted outwards.

The invention discloses a mesh surface of a spaceborne mesh antenna, and the mesh surface employs a rectangular-section rope belt for replacing a circular-section rope, and is used for the mesh surface design of a large-scale high-precision mesh antenna. In order to reduce the errors, caused by the processing and assembly, of a segmented rope, the whole rope belt is used for replacing the segmented rope, and a screw assembly mode is employed for splicing the rope belts to form the whole mesh surface. According to a proposed mesh surface design method, the method can achieve the mesh surface ofa spaceborne high-precision mesh antenna, so as to meet the domestic demands for the large-aperture high-precision mesh antennas.

The invention relates to a flexible water-cooling metal electrode used for a mono-crystal furnace, comprising a water-cooling copper pipe electrode, a stainless steel terminal clamp and a copper gland cover, wherein, the lower part of the water-cooling copper pipe electrode is welded with the stainless steel terminal clamp, and a water-cooling cycle is formed; the upper part of the water-cooling copper pipe electrode passes through the copper gland cover and is hermetically welded with the copper gland cover; the water-cooling copper pipe electrode is a complete water-cooling copper pipe which passes through the stainless steel terminal clamp and then returns back to the stainless steel terminal clamp to form a water-cooling cycle. Because the water-cooling copper pipe has an ability of plastic deformation and can be properly deformed under an exogenic action, thereby a position of the stainless steel terminal clamp can be conveniently moved within a certain range, and then a position of a connecting point between a stainless steel electrode and a graphite electrode and a heater. The invention is favorable for removing errors caused by factors like processing, assembly, time-dependent deformation and so on, and for accurately fixing the heater, thereby a good thermal field is obtained.

The invention discloses a lifting track which comprises a track and a lifting device. A plurality of pulleys are arranged on the lifting device and are respectively arranged on the left side and the right side of the track, a pulley face of each pulley is a conical surface, and both the left end and the right end of the track are tangent with the pulley faces of the pulleys. The lifting track has the advantages that the lifting track ascends and descends by the aid of the pulleys, the pulley faces of the pulleys are the conical surfaces, and the track is tangent with the pulley faces of the pulleys, so that the assembly clearance between the lifting device and the track is small, and the lifting device cannot be jammed on the track.

A universal joint includes a tube having a hollow shape; a slip bush inserted into the tube; and a shaft assembled with the tube through the slip bush, wherein the slip bush includes power transmission parts, which are arranged along an circumferential surface of the slip bush in an axial direction and have pins positioned at centers of the power transmission parts and supports supporting both ends of each pin, and elastic parts, which are arranged along the circumferential surface of the slip bush while being spaced from the power transmission parts and have a section with a C-shape, which is formed in such a manner that a side portion is cut out in the axial direction. Therefore, strength and rigidity are improved, even when twist is generated in the universal joint, so that clearance and noise due to abrasion, pressing, etc. can be minimized.

The invention discloses an improved cleaning doctor locking sleeve structure of a rotary screen printing machine. The locking sleeve structure comprises a locking sleeve side wall, a locking sleeve head blank holder, an open groove and a blank holder groove opening, and further comprises a cylindrical cleaning doctor positioning sleeve which is mounted on a cleaning doctor of the rotary screen printing machine in a sleeving manner, wherein the cleaning doctor positioning sleeve is a hollow body; the interior of the hollow body takes the shape of a stepped structure; the cleaning doctor corresponding to the hollow body is also of the stepped structure; the locking sleeve side wall which is made of a thin metal plate through chipless forming; the locking sleeve head blank holder is designed at one end of the locking sleeve side wall; the open groove is designed on the side near the locking sleeve side wall and the locking sleeve head blank holder; and the blank holder groove opening is also formed in the locking sleeve head blank holder. By virtue of a reinforcing part which is separately machined with the cleaning doctor positioning sleeve, namely the hollow body, the locking sleeve structure is reinforced. The reinforcing part is a thin slat which is partially leant on the locking sleeve side wall.