33results about How to "Reduce machining accuracy" patented technology

The invention discloses a rectangular waveguide sealing window structure for realizing broadband transmission, which belongs to a microwave signal detection device and comprises a first rectangular waveguide cavity, a second rectangular waveguide cavity and a rectangular dielectric block arranged between the first rectangular waveguide cavity and the second rectangular waveguide cavity, the first rectangular waveguide cavity comprises a first rectangular waveguide shell and two first stepped transition structures embedded into an inner cavity of the first rectangular waveguide cavity, and the second rectangular waveguide cavity comprises a second rectangular waveguide shell and two second stepped transition structures embedded into the second rectangular waveguide shell. The opposite side faces of the two first stepped transition structures and the two second stepped transition structures are provided with identical tooth-shaped steps, the second rectangular waveguide shell is further internally provided with an installation cavity communicated with the second I-shaped sliding groove, the two waveguide cavities are connected through screws, and the rectangular dielectric block is fixedly installed in the installation cavity. The vertically symmetrical multi-stage stepped impedance matching network provided by the invention realizes excellent transmission performance with low voltage standing-wave ratio in a wide frequency band, and is suitable for a millimeter wave system with high power and wide frequency band.

The invention relates to the technical field of semiconductors, in particular to a processing technology of a graphite piece with an inclined plane, which comprises the following steps of: placing a raw material piece on the upper side of a first clamp and fixing, and performing primary processing on a surface plate, a vertical plate, a transverse plate and step parts on the surfaces of the surface plate, the vertical plate and the transverse plate in a product piece; the first-time machined part is placed on the surface of a second clamp and fixed, and secondary machining is conducted on the upper half portion of the inclined panel in the product part; the secondary machining part is vertically placed on the side face of a third clamp, one side of the surface plate faces downwards and is fixed, and third-time machining is conducted on the rear half part of the counterbore in the product part; after the position of the third-time machined part is adjusted, the third-time machined part is placed on the side face of a third clamp, one side of the surface plate is upward and fixed, and fourth-time machining is conducted on the front half part of the counterbore, the small hole and the lettering part in the product part; and the fourth-time machined part is placed on the surface of the fourth clamp, fifth-time machining is conducted on the lower half portion of an inclined panel in the product part, the machining precision is improved, and the low machining cost is kept.

The utility model discloses a kind of grinding devices for bearing cover processing, including support frame, linkage assembly is installed on the support frame, linkage assembly is connected and is equipped with fixed block, fixed block is fixed and is equipped with drive machine, drive machine output end is provided with quick-mounting mechanism, the quick-mounting mechanism includes fixed sleeve and plug-in rod, fixed sleeve is fixed in drive machine output end, plug-in rod is inserted in fixed sleeve, plug-in rod bottom end is fixed and is equipped with polishing head, fixed sleeve inboard is fixed and is equipped with clamping plate, the clamping plate is provided with multiple groups, slot is opened in the outer wall of plug-in rod, the outer wall of plug-in rod is opened and is equipped with guide slot, the inner wall of fixed sleeve is fixed and is equipped with guide plate, the guide plate and guide slot are all provided with multiple groups and slidingly connected, by the innovative quick-mounting mechanism design, the quick installation and disassembly function of polishing head is realized, effectively solve the problem of frequently replacing polishing tool in bearing manufacturing and precision machining industry.

According to the technical scheme, the electric curtain embedded track is characterized in that the electric curtain embedded track comprises an installation box body installed on a wall and provided with an installation cavity and a track body arranged in the installation box body, the installation box body comprises a middle track box, transmission boxes and box cover plates connected with the transmission boxes, and the transmission boxes are symmetrically installed at the two ends of the installation box body; the transmission box and the periphery of the transmission box are covered with the box cover plate, the bottom side of the track body extends outwards to form a covering flange wider than the middle track box, the box cover plate is provided with a cavity matched with the covering flange, and the cavity is in lap joint fit with the covering flange. According to the utility model, through the arrangement of the box cover plate and the covering flange, a gap generated between the mounting box body and the mounting cavity can be covered, the processing precision of the mounting cavity is allowed to be properly reduced, and the mounting cavity can obtain more repair and adjustment space during mounting, so that the mounting of the track body is more attractive.

This utility model relates to the field of grinding machine technology, specifically disclosing a grinding machine vibration damping device and a grinding machine, including a vibration damping seat, which includes a pad body and an annular damping pad connected to the bottom of the pad body; and a connecting seat, which includes a central block, a threaded ring connected to the bottom of the central block and threadedly engaged with the pad body, a lever connected to the outer wall of the central block, a reinforcing ring connected to the bottom of the lever, and a rubber washer connected to the top of the central block; in this utility model, the elastic deformation of the annular damping pad can effectively absorb the vibration generated by the grinding machine during operation, reducing the impact of vibration on the grinding machine's machining accuracy and service life. The height of the connecting seat can be adjusted, and after adjustment, the adjusting screw of the stabilizing component can easily adjust the distance between the wedge block and the threaded ring, thereby adjusting the connection tightness between the connecting seat and the vibration damping seat and improving the working stability of the vibration damping device.

This utility model discloses a pallet lifting and positioning device, including a fixed bracket, a flipping bracket, positioning mechanisms distributed on both sides of the flipping bracket, and a driving positioning mechanism. The positioning mechanism includes a positioning drive unit and positioning pins corresponding to positioning holes on the side of the pallet. Multiple positioning pins are connected to the output end of the positioning drive unit through an adaptive adjustment component. It also includes a clamping mechanism that drives the positioning mechanism to move along the axial direction of the positioning pins. This structure compensates for positional deviations through an elastic floating unit, and improves the stability of pallet lifting through multi-point lifting via the cooperation of inclined guide grooves and guide columns. The clamping mechanism is linked with the positioning mechanism to improve response speed. The overall structure is compact and meets the automated requirements for fast and high-precision pallet positioning.

This utility model provides an automatic unloading device for collars of a continuous rolling type machine, relating to the field of rolling type machines. The device includes a support plate for placing the rolling type machine, and a placement plate for placing collars is rotatably connected above the support plate. The edge of the placement plate protrudes outwards. Multiple collars for engaging the collars are slidably connected to the placement plate in a circular array. A notched ring is provided above the support plate, below the protruding portion of the placement plate. This automatic unloading device for collars restricts the collars by using vertically retractable collars, and the notched ring drives the collars to descend at the scraper, thereby allowing the scraper to remove the collars from the device. This solves the problem in the prior art where collars cannot be automatically removed from the rolling type machine.

This utility model discloses a spindle support device for a short-arc machine tool, relating to the technical field of short-arc machine tool equipment. Its main objective is to provide a spindle support device for a short-arc machine tool that saves equipment space and provides an insulating structure between rigid conductive materials. The main technical solution of this utility model is as follows: a spindle support device for a short-arc machine tool, comprising: a base with a first through hole; a spindle inserted into the first through hole; and an insulating support component, comprising a first insulating sleeve, a second insulating sleeve, an insulating bolt, and a support drag component. The first insulating sleeve is disposed between the base and the spindle. The insulating bolt passes sequentially through the spindle and the first insulating sleeve and is connected to the base. One end of the support drag component is connected to the base, and the other end is located on the lower part of the insulating bolt, used to support the insulating bolt. The second insulating sleeve is disposed between the spindle and the support drag component. This utility model is mainly used for short-arc machine tool processing.

The utility model discloses a main-grid-free back contact cell, a cell assembly and a photovoltaic system, and belongs to the technical field of solar cells. The main-grid-free back contact battery comprises a battery piece body, fine grid lines, PAD points, an insulating layer and a solder paste layer, the plurality of fine grid lines are distributed at intervals along a first direction and are all arranged on the battery piece body; each fine grid line is provided with a PAD point, each PAD point comprises a welding point body and an extension part, and at least one end, in the second direction, of each welding point body is connected with the corresponding extension part; the insulating layer covers the extension part; the solder paste layer is arranged on the solder joint body and used for welding the solder strip to the solder joint body. According to the main-grid-free back contact battery, the extension part and the insulating layer are arranged, so that the length of the PAD point can be increased, the flowing range of the molten solder paste layer can be prolonged, and meanwhile, the flowing range of the molten solder paste can be limited, so that the phenomenon that the solder paste layer erodes the thin grid lines outside the PAD point area, and consequently the thin grid lines are broken is avoided.

This invention relates to a multi-pass optical path system and its adjustment method for an off-axis dual-reflector disk laser, overcoming a series of problems associated with existing multi-pump schemes for disk lasers, such as high processing requirements, difficult system assembly and adjustment, and complex structure and difficult optical adjustment of the signal light amplification system. This invention employs a combination of a series of small-aperture spherical or aspherical mirrors and total reflection mirrors, utilizing a discrete adjustment method to uniformly distribute the pump spot across different mirror surfaces, achieving multi-pass pumping of the pump light and improving the beam quality of the output laser. Simultaneously, a focusless system structure is used to achieve multi-pass amplification of the signal light, improving the operability of optical adjustment. Furthermore, the system can achieve a common optical path for pumping and amplification, facilitating high-efficiency absorption of the pump light and optimal signal light gain amplification; it also allows for adjustment of the number of multi-passes, resulting in high system flexibility, low processing and debugging difficulty, convenient equipment maintenance, and ease of industrial application.

The invention discloses a moving door mechanism and an air conditioner. The moving door mechanism comprises an air guide frame, a door body and a supporting assembly. The door body is provided with a rotating shaft, and the rotating shaft is configured to be driven by a motor to link the door body to rotate relative to the air guide frame so as to enable the door body to form an open state or a closed state; the supporting assembly comprises a first supporting structure and a second supporting structure, and the first supporting structure and the second supporting structure are sequentially arranged from inside to outside, are arranged between the air guide frame and the door body, are used for jointly supporting the door body and can synchronously move along with the door body. The technical problem that in the prior art, a door body is prone to being blocked or stuck is solved.

The bidirectional grinding device comprises a workbench and two grinding mechanisms symmetrically arranged on the workbench, and each grinding mechanism comprises a fixing assembly, a telescopic driving unit, a grinding assembly, a lifting driving assembly and a mounting base mounted at the top end of the lifting driving assembly; the fixing assembly is used for fixedly supporting the end of a to-be-polished workpiece, and the lifting driving assembly is used for controlling the polishing degree of the polishing assembly to the to-be-polished workpiece. Inclined guide slideways are formed in the two inner side faces of the mounting base, the guide slideways are in sliding fit with the polishing assembly, and the inclination degree of the guide slideways is the same as the radian of the machining face of the to-be-polished workpiece; the fixed end of the telescopic driving unit is rotationally connected with the center position of the workbench, the movable end of the telescopic driving unit is rotationally connected with the bottom of the grinding assembly, and the telescopic driving unit is used for driving the grinding assembly to reciprocate on the machining face of the to-be-ground workpiece along the guide sliding way.

The utility model belongs to the technical field of sewing equipment, and particularly relates to a sewing machine. Comprising a machine shell and a take-up-lever pin, a take-up-lever pin hole and an adjusting shaft hole are formed in the machine shell, the diameter of the take-up-lever pin hole is larger than or equal to the aperture of the adjusting shaft hole, the take-up-lever pin hole and the adjusting shaft hole are coaxially arranged, and the take-up-lever pin comprises a take-up-lever pin body and an eccentric section eccentrically arranged at one end of the take-up-lever pin body. The eccentric section is parallel to the axis of the take-up-lever pin body, the take-up-lever pin body is arranged in the take-up-lever pin hole, and the eccentric section is connected with the take-up-lever assembly. The take-up-lever pin hole and the adjusting shaft hole are coaxially arranged, the take-up-lever pin can be connected with a take-up-lever assembly only by arranging the take-up-lever pin into an eccentric structure, the take-up-lever pin hole and the adjusting shaft hole can be machined at the same time through one drilling tool, two-time clamping is not needed, machining is easy and convenient, and precision is high.

The utility model relates to an overload protection module and a plug, and belongs to the technical field of power supplies. The overload protection module comprises a module shell, a first wiring structure, a second wiring structure, a deformation sheet and a reset mechanism, the module shell comprises a bottom shell and an upper cover, the bottom shell is box-shaped, and each of the first wiring structure and the second wiring structure comprises a connecting piece located in the bottom shell and a wiring end located outside the bottom shell; the deformation sheet and the reset mechanism are both located in the module shell and used for electrically connecting and disconnecting the connecting sheet of the first wiring structure and the connecting sheet of the second wiring structure; the top end face of the bottom shell is provided with multiple first positioning structures, the bottom end face of the upper cover is provided with multiple second positioning structures, and the bottom shell and the upper cover are positioned through the first positioning structures and the second positioning structures. Wherein the first positioning structure is a square hole and the second positioning structure is a cylinder, or the first positioning structure is a cylinder and the second positioning structure is a square hole. According to the invention, the electricity utilization safety can be improved.

The utility model discloses a punching die structure for punching the side wall of an annular structure, an upper die is provided with two slotting tools, a lower die is provided with a punching sliding block, two transmission sliding blocks and two reset pieces, the punching sliding block is arranged on the inner side of the projection of an upper die plate, the side wall of the punching sliding block is provided with a side punch, and the transmission sliding blocks are in transmission connection with the reset pieces and can be in transmission connection with the slotting tools during die assembly. According to the utility model, a hole groove on the side wall can be formed by punching from the inner side to the outer side of a product, the displacement of the side punch can be guided and limited to prevent the side punch from scratching the inner wall of the product, the forming yield is ensured, the overall layout of the die is compact, the space of the lower die can be fully utilized, and the purpose of reducing the size of the lower die is achieved; therefore, the assembling precision of matched parts on the die can be improved, the machining precision of all parts can be properly reduced, the die manufacturing cost is reduced, the die manufacturing period is shortened, and the production efficiency is improved.

The utility model relates to the technical field of pigging valves, in particular to an extensible pigging valve and pressure regulating valve combined device, which comprises a pigging valve main body, a mounting ring seat, a support frame, a connecting piece, a regulating piece and a locking mechanism, one end of the pigging valve main body is connected with a pressure regulating valve; the mounting ring seat is communicated with the pigging valve main body; a quick release cover is arranged in the mounting ring seat and is used for sealing the pigging valve main body; the support frame is arranged on the mounting ring seat, and one end of the support frame is connected with the quick release cover; the connecting piece part is arranged on the mounting ring seat; the adjusting piece is arranged on the supporting frame, and one end of the adjusting piece is connected with the quick release cover; the locking mechanism is arranged on the adjusting piece and used for preventing the quick-release cover from loosening. According to the pipeline pigging valve, the adjusting piece and the locking mechanism are arranged in a matched mode, the limiting pawl is attached to the ratchets of the limiting ratchet wheel under the action of the attaching spring, reverse rotation of the quick-release cover is avoided, and then sealing between the quick-release cover and the pipeline pigging valve body is guaranteed.

This invention discloses a hingeless rotor hub and a helicopter, belonging to the field of helicopter technology. It solves the problems of existing hingeless rotor hubs, which use complex metal bearing hooks, have high requirements for sealing, assembly, lubrication, precision, and working environment, and suffer from wear, indentation, and gaps after prolonged operation. The hingeless rotor hub includes a flexible bearing and a central hub component. The central hub component is located on the outer wall of the flexible bearing, and the helicopter's rotor clamp is located on the inner wall of the flexible bearing. The flexible bearing comprises, from the outside to the inside, an outer connecting layer, a stacked layer, and an inner connecting layer, sequentially nested together. The outer connecting layer is fixedly connected to the central hub component; the inner connecting layer is fixedly connected to the rotor clamp; the stacked layer includes radially alternating elastic and rigid layers. This hingeless rotor hub can be used to connect the rotor hub and rotor clamp.

The utility model discloses a dual-driving-part Lissajous optical fiber scanner, which comprises a cylindrical piezoelectric actuating part, a sheet-shaped piezoelectric actuating part and an optical fiber, and is characterized in that at least one of the left side and the right side of a piezoelectric material cylindrical body is provided with a correspondingly matched electrode, and the front end of the piezoelectric material cylindrical body is driven to vibrate left and right along the horizontal direction; the left side wall and the right side wall of the piezoelectric material barrel-shaped body are both provided with installation grooves used for being connected with the sheet-shaped piezoelectric actuating parts. The sheet-shaped piezoelectric actuating parts and the overlapping parts enable the inherent frequency of a combined part composed of the piezoelectric material barrel-shaped body, the sheet-shaped piezoelectric actuating parts and the optical fibers in the horizontal direction to be larger than the same-order inherent frequency in the vertical direction. According to the invention, the vibration frequencies of the combined part in two directions meet the requirements of Lissajous scanning working conditions by adjusting the appearance structure and / or size parameters of the sheet-shaped piezoelectric actuating part, the requirements of the processing size and precision of the cylindrical body are reduced, the processing difficulty of the cylindrical body is low, the processing error is easy to control, and the yield is high.

This utility model relates to a resonator and an integrated filter, comprising a substrate with a first metal layer attached to its surface; a ground plane disposed on the substrate; an electrode surface disposed on the substrate; a circuit printing surface including a first end face and a second end face, the first end face being insulated from the substrate; the second end face being insulated from the substrate and opposite to the first end face; a resonant cavity unit including a through hole disposed on the substrate, one end of the through hole being connected to the first end face and the other end of the through hole being connected to the second end face; the resonant cavity unit being disposed at the geometric center of the substrate. This utility model can improve the thickness of the resonator, thereby reducing the difficulty of production and processing, making the resonator easier to process. Simultaneously, it is less prone to deformation during processing, allowing for control of processing accuracy, ensuring product quality meets requirements, and making it suitable for mass industrial production.

The application discloses an independent double-gas-path air spring with adjustable rigidity and damping, relates to the technical field of air springs, and comprises a base for supporting the bottom of the spring, an elastic component installed on the top of the base for elastically supporting, a top plate installed on the top of the elastic component for being connected with equipment, and four damping mechanisms arranged at the four ends of the base and connected with the bottom of the top plate for buffering the downward pressure of the top plate. The air spring realizes two-way rigidity adjustment through independent double-gas-path formed by a main air bag and a secondary cavity. When the load is light, an electronic valve is opened, compressed air of the main air bag enters the secondary cavity through a first gas path, the total volume of the system is increased, and the rigidity is reduced. When the load is heavy, a worm-gear drive piston plate is reversely compressed along a second gas path, gas returns to the main air bag through a one-way valve, the closed volume is reduced, and the rigidity is improved. The rigidity drift and the decrease of machining precision caused by the fixed volume of the single gas path are avoided.

A multi-well oil-gas-liquid three-phase metering switching device relates to the technical field of oil-gas metering. A row of liquid inlet pipes is welded on the wall of a conversion pipe, two liquid outlet pipes are welded on the positions on the two sides of the liquid inlet pipes, a piston is arranged in the conversion pipe, the left side of the piston is connected with a jack rod, the jack rod is fixedly connected with a rigid plate, an electric push rod is connected with the upper part of the conversion pipe through a hinge, and the screw rod of the electric push rod is connected with the rigid plate through a hinge. The beneficial effects of the device are as follows: multiple single-well liquid inlet pipes and liquid outlet pipes are arranged on the conversion pipe through design, the piston is moved by the electric push rod, when the piston moves to the position of a liquid inlet pipe, the gas and liquid of the single well flow into the metering pipe for metering, the gas and liquid of the single well on the two sides of the piston are discharged to the external pipeline through the liquid outlet pipes, and the pressure is not blocked when the piston is switched to other liquid inlet pipes, which is beneficial to safe operation, can prevent fine sand in the liquid from damaging the seal, and has the characteristics of simple structure, stable and reliable operation, low cost and high safety performance.

The present application belongs to hydraulic control field, and relates to a hydraulic amplifier manufacturing method, comprising the following steps: (1) preparing materials, milling cylindrical prepared materials; (2) processing oil passage cavity on the cylindrical prepared materials; (3) processing shape one on the cylindrical prepared materials obtained in step (2); (4) turning over the cylindrical prepared materials and shape one by 180 degrees, cutting the excess of the cylindrical prepared materials, and processing the initial sample of the jet sheet on the shape one; (5) processing shape two on the initial sample of the jet sheet, and obtaining the initial sample of the hydraulic amplifier; (6) removing the connecting section of the initial sample of the hydraulic amplifier; (7) performing heat treatment on the initial sample of the hydraulic amplifier; (8) polishing the oil passage cavity and internal flow channel of the initial sample of the hydraulic amplifier, and obtaining the hydraulic amplifier. The present application eliminates the precision machining requirement caused by assembly requirement, optimizes the design process and machining process method, improves the integration degree of the precision assembly parts, reduces the precision machining difficulty, and reduces the machining cost.

This application discloses a dual-drive Lissajous fiber optic scanner, comprising a cylindrical piezoelectric actuator, a sheet-like piezoelectric actuator, and an optical fiber. The cylindrical piezoelectric actuator includes a piezoelectric material cylindrical body, with a first inner electrode and a first outer electrode correspondingly arranged on at least one of its left and right sides. The rear end of the sheet-like piezoelectric actuator is attached to the upper or lower surface of the piezoelectric material cylindrical body. The combined portion, consisting of the piezoelectric material cylindrical body, the sheet-like piezoelectric actuator, and the optical fiber, has a difference between its U-order natural frequency (closest to its V-order natural frequency in the horizontal direction) and the V-order natural frequency in the horizontal direction. This application utilizes the adjustment of the shape and / or dimensional parameters of the sheet-like piezoelectric actuator and the overlapping portion to ensure good scanning performance while preventing coupling of vibrations in the two directions of the combined portion.

The utility model discloses a photovoltaic cell piece's testing arrangement, including test base, test P pole row, test N pole row, wire exit, flexible conductive layer, cell piece, test upper plate, test P pole row and test N pole row are installed in test base respectively according to polarity, the flexible conductive layer whole piece is laid on test P pole row and test N pole row, the test base four corners are equipped with guide shaft, test upper plate corresponds guide shaft and is equipped with guide shaft sleeve. Adopt the whole surface flexible conductive layer and contact cell piece, do not need to carry out accuracy positioning, regardless of the transformation of figure, the versatility is extremely strong, reduce the overall processing accuracy of equipment, break through the test of no main grid cell piece, reduce the cost of photovoltaic cell piece testing equipment, reduce the maintenance frequency of testing arrangement and improve maintenance convenience, guarantee the reliability of test quality.

The utility model provides a kind of transfer ring and forming machine, wherein, transfer ring includes: ring body, a plurality of for clamping tire cylinder pad and multiple guide components, pad is along the circumferential arrangement of ring body, and can move along the radial direction of ring body;Guide component is arranged between two adjacent pads, in two adjacent pads, one end of guide component is rotatably connected between a pad, and the other end of guide component is slidably connected between another pad.The utility model solves the problem that the concentricity of pad in the expansion and contraction process of the transfer ring in the prior art is poor.

This invention relates to the field of heat exchanger installation technology, specifically to a tube head guiding device for heat exchanger tube insertion. The device includes a guiding assembly, which is a conical frustum structure. An adjusting assembly is rotatably mounted on the smaller diameter side of the guiding assembly. One end of the adjusting assembly passes through the axis of the guiding assembly and extends to the outside of its larger diameter. The heat exchanger tube head is located on the larger diameter side of the guiding assembly. Multiple inner support assemblies capable of sliding synchronously inward or outward are mounted on the other end of the adjusting assembly. These inner support assemblies abut against the inner surface of the heat exchanger tube head. This invention, while ensuring heat exchanger tube installation, reduces assembly difficulty and processing accuracy, significantly improves work efficiency, and reduces manufacturing costs. The guiding device facilitates the replacement of heat exchanger tube heads, enabling quick disassembly and reuse. The conical guiding assembly significantly improves blind insertion efficiency.

The low-temperature vacuum pump refrigerating machine comprises a power motor and a box body, the power motor comprises a power driving shaft, the power motor is connected to the box body, the power driving shaft extends into the box body, a reverse connecting thread is arranged at the end of the power driving shaft, and the reverse connecting thread and the power motor are arranged in the direction opposite to the rotating direction. A cam shaft assembly is arranged in the box body and comprises an eccentric shaft body, a reducing shaft sleeve, a first bearing and a second bearing, the eccentric shaft body is in threaded connection with a reverse connecting thread of the power driving shaft, the eccentric shaft body is provided with a first bearing part and a second bearing part in the axial direction, and the first bearing is arranged on the first bearing part; the variable-diameter shaft sleeve is arranged on the second bearing part, and the second bearing is arranged on the variable-diameter shaft sleeve. Therefore, the refrigerating machine adopts a brand-new cam group shaft combined structure, so that the manufacturing cost is reduced, the structural strength is improved, and the service life is prolonged.

This utility model discloses a handheld mixer, including a main housing, a driver disposed within the main housing, a stirring protective shell installed at the lower end of the main housing, a cutter shaft rotatably installed within the stirring protective shell, and a blade disposed at the lower end of the cutter shaft. The key feature is that a second connector is provided at the upper end of the cutter shaft, and a first connector is movably mounted at the lower end of the driver's output shaft. The first connector and the output shaft are coupled via a first movable shaft coupling structure so that rotation of the output shaft drives rotation of the first connector. The first connector and the second connector are coupled via a second movable shaft coupling structure so that rotation of the first connector drives rotation of the second connector. During operation, the female connector can automatically find its equilibrium position under centrifugal force, achieving dynamic self-centering, thereby greatly improving rotational balance and avoiding vibration and noise problems caused by insufficient coaxiality.

The utility model discloses a machine tool chuck positioning device, relates to the technical field of machine tool chuck positioning, and solves the problems that if the fitting position of a fixed disc and a machine tool chuck is lack of effective limiting control, the fixed disc and the machine tool chuck possibly slide relatively under the action of large centrifugal force generated by high-speed rotation of a machine tool, the machining precision is reduced, and the machining cost is reduced. The device comprises a positioning outer frame, a positioning mechanism comprises a positioning disc and a limiting groove, a limiting block and a nut column are clamped in the limiting groove, and a bolt rod is connected between a first bolt hole and the inner wall of the nut column in a threaded mode. The limiting blocks clamped in the limiting grooves are tightly matched with the nut column to form a stable limiting structure, so that the precise limiting control effect is effectively achieved, a reliable connecting system is constructed through the bolt rod in threaded connection with the inner wall of the first bolt hole and the inner wall of the nut column, and stable connection between components is effectively guaranteed.

The application relates to a side wall trim assembly, a vehicle body outer trim assembly and a vehicle. The side wall trim assembly comprises a trim and a sealing element. A reserved gap is arranged between the circumferential side wall of the trim and a vehicle body panel. The sealing element comprises a first connecting section, which is close to the reserved gap and is arranged between the trim and the vehicle body panel. The projection of the first connecting section on a plane parallel to the first direction and the third direction is located within the projection range of the trim on the plane parallel to the first direction and the third direction. One end of the first connecting section in the second direction is connected with the trim, and the other end of the first connecting section in the second direction is provided with an abutting portion, which is used for abutting with the vehicle body panel. The side wall trim assembly is arranged as above, the demarcation line between the trim and the vehicle body panel can be highlighted, the wind noise can be reduced, and the machining precision of the trim and the production cost can be reduced.