30results about How to "Concentricity is easy to guarantee" patented technology

The invention provides an expansion clamping device which comprises an expansion sleeve and a chuck connected to one end of the expansion sleeve, wherein a plurality of expansion gaps are axially formed in the expansion sleeve; a core rod is mounted in the expansion sleeve; the side surface of the core rod is conical; the inner wall of the expansion sleeve is a conical surface matched with the core rod; the small-diameter end of the core rod faces to the chuck; a bolt penetrates through the chuck to be in threaded connection with the small-diameter end of the core rod to tightly pull the core rod and the expansion sleeve; chuck teeth are arranged on the chuck. According to the expansion clamping device, a bottom barrel can be quickly tightened by expansion and dismounted, and the chuck is matched with a processing tool of the bottom barrel through the chuck teeth, so that the bottom barrel can be firmly fixed and prevented from rotating during processing; an expansion mechanism is convenient to mount and dismount, the bottom barrel cannot be damaged, and the clamping efficiency is high.

The invention belongs to the field of helicopter process equipment design, and particularly relates to a mounting and positioning device for repairing a segmented long hinge of a helicopter. The device takes an L-shaped positioning slide rail as a main body, a plurality of left positioning slide blocks and right positioning slide blocks are arranged on the L-shaped positioning slide rail, and each positioning slide block can position one hinge tooth of a hinge; the left positioning sliding blocks and the right positioning sliding blocks are combined in pairs, so that one hinge is positioned; the hinge teeth of each section of hinge are respectively positioned through the combination of a plurality of groups of left and right positioning sliding blocks, and one group of left and right positioning sliding blocks is selected for a newly added hinge to realize positioning; and all the hinges are ensured to be positioned on the same axis after replacement.

The invention discloses an electric three-way valve and refrigeration equipment. The electric three-way valve comprises a valve body (1) and a coil (2). A power gear (4) and an execution gear (5) arearranged inside the valve body (1). The power gear (4) is driven by a rotor spindle (3) of the coil (2) and is further in meshing transmission with the execution gear (5) through a reduction gear (6).The execution gear (5) is installed on a center shaft (7) and used for driving a sliding block (9) to achieve flow path switching. The power gear (4) and the execution gear (5) are installed on the center shaft (7) together and are further distributed up and down in a spaced mode. According to the electric three-way valve, the power gear and the execution gear are located on the same center shaftand are further connected through the reduction gear, the gear coaxiality is greatly enhanced in production, and the phenomenon that normal meshing or clamping cannot be conducted due to the poor gear-shaft coaxiality is effectively avoided.

The invention discloses an electric tee valve. The electric tee valve comprises a valve body (1) and a coil (2). A power gear (4), an execution gear (5) and a lining plate (10) are arranged in the valve body (1). The power gear (4) is engaged with the execution gear (5) through a speed reduction gear (6) for transmission, and the power gear (4) and the execution gear (5) are installed on a centershaft (7) together and distributed up and down in a spaced mode. The lining plate (10) is provided with a bent portion (11), and the center shaft (7) is sleeved with the bent portion (11) through a shaft hole (12). The power gear and the execution gear of the tee valve are arranged on the same center shaft, so that the coaxiality of the gears is greatly enhanced, and the phenomenon that gear shafts cannot be normally engaged or clamped to each other due to poor coaxiality is effectively avoided; and in addition, the center shaft is fixed with the lining plate and the both ends of a valve seat,so that the center shaft is more firm and is prevented from bending and disengaging.

The invention discloses a friction experiment device in a thermal vacuum environment. The device comprises a temperature-controllable vacuum box, a loading box, a total mounting bottom plate, a loading end magnetofluid sealing shaft, a third heat insulation coupling, a torque sensor, a first heat insulation coupling, a test piece, a second heat insulation coupling, a driving end magnetofluid sealing shaft, a driving end normal temperature and normal pressure box, a driving device and a loading device. According to the invention, a servo motor can be arranged in a normal-temperature and normal-pressure box formed by fixing the open end surface of the normal-temperature and normal-pressure box and a normal-temperature and normal-pressure box end cover 14 through bolts so that under the condition that the large-torque and high-rotating-speed test requirements can be met, driving and loading outside a vacuum tank are not needed; and when the test is completed, a special vacuum tank does not need to be customized, only the mounting platform needs to be put down, the length of a transmission chain is greatly shortened, and the coaxiality is easy to guarantee.

The invention discloses a fan assembly, an oil smoke separating net and a range hood. The fan assembly comprises a drive device, a wind wheel and the oil smoke separating net, wherein the drive devicecomprises a body and a drive shaft; the wind wheel is fixedly connected with the drive shaft; the oil smoke separating net comprises a net body and a mounting part connected with the net body; at least part of the mounting part is positioned inside the wind wheel; and the part, positioned in the wind wheel, of the mounting part is fixedly connected with the drive shaft. According to the fan assembly disclosed by the invention, the mounting part of the oil smoke separating net extends into the wind wheel, and is fixedly connected with the drive shaft, so that the drive shaft is reduced, processing difficulty of the drive shaft is reduced, and structural strength of the drive shaft is guaranteed; and meanwhile, coaxiality of the drive shaft and the oil smoke separating net is guaranteed more easily.

The invention provides a rotating motor and a fan. According to the rotating motor provided by the invention, a plurality of accommodating grooves are formed in the radial inner surface of at least one bearing seat of a supporting frame at intervals, and soft arc-shaped petals are arranged in the accommodating grooves, so that the inner diameters of the soft arc-shaped petals are smaller than the inner diameters of the corresponding bearing seats, and the soft arc-shaped petals elastically abut against the corresponding bearings; therefore, a certain binding force is formed between each soft arc-shaped petal and the corresponding bearing, the axial and radial stress of the bearing can be improved, the service life of the bearing is prolonged, the relative position of the inner ring and the outer ring of the bearing can be adjusted during high-speed rotation, and a certain self-adaptive aligning effect is achieved; and the area between the two adjacent accommodating grooves in the bearing seat provided with the soft arc-shaped petals can be well connected with the corresponding bearing, so that the bearing can be more stably mounted in the corresponding bearing seat, and the operation stability and the reliability of the rotating motor are ensured.

The invention discloses a core-expanding fixture for a workpiece with gullies in the inner wall. The core-expanding fixture comprises a concentric shaft, a limiting taper end head sleeving one side ofthe concentric shaft and a movable taper end head sleeving the other side of the concentric shaft, wherein one side, close to the movable taper end head, of the concentric shaft is provided with external threads; the external thread section of the concentric shaft is provided with a locking nut; the concentric shaft between the limiting taper end head and the movable taper end head is sleeved with a tubular expanding core; a plurality of through holes are evenly formed in the circumferences of the two sides of the expanding core; radial slide blocks are arranged in the through holes; the upper surfaces of the radial slide blocks are provided with a plurality of blind holes; and a movable block is arranged in each blind hole. The core-expanding fixture is convenient to clamp, so that the core-expanding fixture capable of clamping the workpiece quickly is especially suitable for the high-precision machining of the workpiece with the gullies, stripes, small grooves and the like on the inner walls of an aerial bomb body and the like; and in the process of clamping the expanding core, the damage to the gullies and the like on the inner wall of the aerial bomb body is small, so that theimprovement of the product qualification rate and production efficiency is facilitated.

The invention belongs to the technical field of optical fiber communication, and particularly relates to a high-speed coupling lens which comprises a lens arranged on one side of a reflecting element. The lens is provided with an aspheric surface I and an aspheric surface II; and the reflecting element is provided with reflecting surfaces corresponding to the aspheric surface I and the aspheric surface II. According to the invention, the problems of the conventional coupling lens can be effectively solved, the process difficulty is reduced, and the transmission rate is improved; no other optical surface is arranged between the first aspheric surface and the second aspheric surface to play an interference role, the concentricity of the two surfaces is easily guaranteed, in addition, detection and film coating of the two aspheric surfaces are not interfered by other surfaces, and film coating and detection are easily achieved; the aspheric surface II is independently arranged instead of being arranged in the optical fiber jack, so that the lens does not need to be coated in the jack, and the processing is convenient; by arranging the microstructure, the light intensity of the central area of the VCSEL light beam can be inhibited, the reflection of the whole system is reduced, and the transmission bandwidth is improved.

A vacuum three-position switch with a rapid earth switch overcomes the defects that in the prior art, an existing switch is complex in structure, large in size, high in cost, incomplete in function and poor in safety. The vacuum three-position switch with the rapid earth switch is characterized in that a rapid earth switch electric conductor is arranged in a central hole of an upper cover plate which is welded to the top end of an upper insulating cylinder, an isolation electric conductor is welded between the upper insulating cylinder and a middle insulating cylinder, an outgoing line electric conductor is welded to the middle insulating cylinder and a lower insulating cylinder through an annular connecting body of the outgoing line electric conductor, a movable electric conductor which is fixedly connected with an insulating pull rod is arranged in a hollow guide sleeve welded to the upper side of a central hole of a lower cover plate, and the axis of the rapid earth switch electric conductor, the axis of the insulating electric conductor, the axis of the movable electric conductor, the axis of the outgoing line electric conductor, the axis of an earth electric conductor, the axis of the upper insulating cylinder, the axis of the middle insulating cylinder and the axis of the lower insulating cylinder are in the same line. The vacuum three-position switch with the rapid earth switch has the advantages that due to the fact that the movable electric conductor moves perpendicularly, a crank is omitted, the concentricity of the movable electric conductor, the insulating electric conductor and the earth electric conductor can be easily guaranteed, the machining difficulty of the guide sleeve is lowered, and the vacuum three-position switch with the rapid earth switch is simple in structure, small in size, low in cost, complete in function and high in safety.

The invention relates to a pipeline milling machine, and in particular relates to a high-efficiency pipeline milling facing machine which comprises a groove milling device, a cutter lifting system, pipeline conveying systems, an electrical control system and a bracket table, wherein the cutter lifting system and the groove milling device are arranged on the bracket table; the groove milling device is fixed on the cutter lifting system; the two pipeline conveying systems are also arranged at the two ends of the bracket table; the high-efficiency pipeline milling facing machine also comprises a rotation driving system and pipeline compression systems; the pipeline compression systems are respectively arranged at the two sides of the cutter lifting system; the rotation driving system is arranged under the pipeline compression systems; the pipeline compression systems and the rotation driving system are electrically connected with the electrical control system. The high-efficiency pipeline milling facing machine can be used for double-side groove processing at the off-position in the middle of a pipeline by combining pipeline rotation and cutter rotation, is wide in application scope of pipe diameter and wall thickness, can easily guarantee the concentricity of the pipeline, and is high in working efficiency, convenient in control of the electrical control system and low in noise in the running process.

A drum washing machine includes a tub installed in a housing to receive wash water therein, a drum rotatably installed in the tub, a rotor having a rotating shaft connected to the drum, a bearing housing having at least one bearing for supporting the rotating shaft of the rotor, the bearing housing being located at the tub, and a stator spaced apart from the rotor by a predetermined distance and directly connected to the tub.

The invention relates to a photoelectric composite rotary connector, which includes an optical rotary connector and an electrical rotary connector. The stator of the optical rotary connector and the rotor of the optical rotary connector together have a wiring hole coaxial with the rotating shaft, and the optical rotary connector rotor has an anastomosis and fixed assembly in the wiring hole so that the optical The rotor of the rotary connector is coaxially assembled with the rotating shaft, and the stator of the optical rotary connector is fixedly connected with the stator of the electrical rotary connector. The invention provides a photoelectric composite rotary connector which is easy to ensure the coaxiality of the optical rotary connector and the electric rotary connector.

The invention discloses an electric tee valve. The electric tee valve comprises a valve body (1) and a coil (2). A power gear (4), an execution gear (5) and a lining plate (10) are arranged in the valve body (1). The power gear (4) is engaged with the execution gear (5) through a speed reduction gear (6) for transmission, and the power gear (4) and the execution gear (5) are installed on a centershaft (7) together and distributed up and down in a spaced mode. The lining plate (10) is provided with a bent portion (11), and the center shaft (7) is sleeved with the bent portion (11) through a shaft hole (12). The power gear and the execution gear of the tee valve are arranged on the same center shaft, so that the coaxiality of the gears is greatly enhanced, and the phenomenon that gear shafts cannot be normally engaged or clamped to each other due to poor coaxiality is effectively avoided; and in addition, the center shaft is fixed with the lining plate and the both ends of a valve seat,so that the center shaft is more firm and is prevented from bending and disengaging.

The invention provides a throat pressure tapping nozzle and a device using the same. The throat pressure tapping nozzle is characterized in that a nozzle body, the throat and a rear expanding sectionare of an overall structure; and the throat is provided with a pressure tapping hole, and the pressure tapping hole of the throat is perpendicular to the axis of the nozzle body and conducts straighthole pressure tapping. The throat pressure tapping nozzle is applied to the measuring device for measuring the water flow of a steam turbine, machining can be facilitated, the structure and the technology are simplified, using reliability and safety are improved, the verifying pass percent is increased, and the measuring precision is improved.

The invention discloses a constraint device of an engine shaft part, The restraining device of the engine shaft part comprises a hoop ring, a through hole is formed in the hoop ring, an end face of one end of the hoop ring is a plane, and the hoop ring is provided with a plurality of clamping devices; each clamping device comprises a pressing plate, a sliding block, an elastic piece and a first bolt, wherein deformation sections are further arranged in the middles of the elastic pieces, a hole channel is formed in the hoop ring, the sliding blocks are partially located in the hole channel, andthe sliding blocks can slide along the hole channel; the pressing plate is fixed at one ends, close to the through hole, of the sliding blocks, one ends of the elastic pieces are fixed to one ends, far away from the through hole, of the sliding blocks, and the other ends of the elastic pieces are fixedly connected with the hoop ring; and a first bolt is in threaded connection with the hoop ring,one end of the first bolt extends into the hole channel, and the end part of the first bolt extending into the hole channel acts on outer convex sides of the deformation sections. According to the constraint device, the relation between the axis of the shaft part and the axis of the constraint device can be conveniently controlled.

The invention discloses an electric three-way valve and refrigeration equipment. The electric three-way valve comprises a valve body (1) and a coil (2). A power gear (4) and an execution gear (5) arearranged inside the valve body (1). The power gear (4) is driven by a rotor spindle (3) of the coil (2) and is further in meshing transmission with the execution gear (5) through a reduction gear (6).The execution gear (5) is installed on a center shaft (7) and used for driving a sliding block (9) to achieve flow path switching. The power gear (4) and the execution gear (5) are installed on the center shaft (7) together and are further distributed up and down in a spaced mode. According to the electric three-way valve, the power gear and the execution gear are located on the same center shaftand are further connected through the reduction gear, the gear coaxiality is greatly enhanced in production, and the phenomenon that normal meshing or clamping cannot be conducted due to the poor gear-shaft coaxiality is effectively avoided.