1431 results about "Retaining ring" patented technology

The invention provides a driving wheel mechanism and a substrate conveying device, the driving wheel mechanism comprises a plurality of driving wheel assemblies, each driving wheel assembly comprises a rotating shaft and a driving wheel connected with the rotating shaft, the plurality of rotating shafts are nested layer by layer in the radial direction and are coaxially arranged, and the plurality of driving wheels are stacked in the axial direction; a first groove is formed in the outer circumferential wall of a rotating shaft of at least one transmission wheel assembly, a second groove is formed in the inner circumferential wall of a transmission wheel of the other transmission wheel assembly adjacent to the transmission wheel assembly provided with the first groove, and the first groove and the second groove are opposite in the radial direction to jointly form an annular limiting space capable of being opened and closed. The rotary connecting piece comprises an outer ring and an inner ring capable of rotating relative to the outer ring; the rotary connecting piece is arranged in the annular limiting space capable of being opened and closed, the inner ring is arranged in the first groove, and the outer ring is arranged in the second groove, so that every two adjacent transmission wheel assemblies provided with the first groove and the second groove respectively can rotate relatively. According to the invention, additional positioning structures such as a shaft shoulder and a check ring required by the installation of a traditional bearing are avoided, and the axial and radial sizes are reduced.

The self-adjusting abrasive flow clamp is suitable for machining a tee joint through the abrasive flow technology and is characterized in that the self-adjusting abrasive flow clamp comprises a base, a baffle ring, a surrounding cylinder, a first arc-shaped bent pipe, a second arc-shaped bent pipe and a third arc-shaped bent pipe, opening structures are arranged at the two ends of the surrounding cylinder, a mounting hole is formed in the baffle ring, and an arc-shaped protrusion is arranged on the top face of the base; when abrasive particles enter through the third arc-shaped bent pipe, the abrasive materials flow out only through the first arc-shaped bent pipe; when the grinding materials are input through the groove, the grinding materials enter the tee joint through the second arc-shaped bent pipe and are output through the top end of the third arc-shaped bent pipe, the tee joint grinding efficiency is improved, and time consumption is reduced.

The provided is an anti-detachment elastic retaining ring capable of springing back for self-locking and a mounting method thereof. The anti-detachment elastic retaining ring includes a retaining ring body, where the retaining ring body is provided with an opening; corresponding to two sides of the opening, two ends of the retaining ring body respectively form a first end and a second end; the first end and the second end interlock with each other; corresponding to interlocking front end positions of the first end and the second end, front ends of the first end and the second end are respectively provided with a first connecting extension section and a second connecting extension section; and the first connecting extension section and the second connecting extension section extend laterally to form a first limiting protrusion and a second limiting protrusion, respectively.

The utility model discloses a screw pump with an adjustable shaft seal position structure, which relates to the technical field of screw pumps and comprises a driving screw, a shaft elastic retainer ring is arranged on the outer side of the top of the driving screw and clings to the end of an adjusting shaft sleeve, a sealing gland is fixedly connected to the outer side of the driving screw, and the sealing gland is fixedly connected to the outer side of the driving screw. A bearing seat is arranged at the end, close to the front end cover, of the sealing gland, a screw is in threaded connection with the end, away from the front end cover, of the sealing gland, the bearing seat is in threaded connection with the sealing gland through the screw, and a bearing is arranged at the bottom of the end, close to the front end cover, of the driving screw. Wherein an O-shaped sealing ring groove is formed in the outer surface of the bottom of the driving screw rod, an elastic check ring groove for a hole is formed in the outer surface of the top of the driving screw rod, an adjusting shaft sleeve is arranged on the outer side of the driving screw rod, and the technical problems that the sealing replacement process is tedious, only one sealing material can be selected, and many limitations exist are solved.

A watchband can comfortably secure an electronic device to a wrist of a user. The watchband can include a base having a contact surface opposite an engagement surface and an engagement ribbon forming loops on the engagement surface of the base for receiving a hook of a buckle. The engagement ribbon can be interwoven with the base to provide secure anchoring for the hook within one of the loops. The woven portions of the watchband can be securely coupled to end structures, such as the buckle, retaining rings, and / or a connector. The watchband provides adjustable lengths to accommodate different fit configurations as desired.

The invention relates to the technical field of pipeline grinding and welding, in particular to a pipeline groove grinding and welding device which comprises a supporting assembly, an adjusting ring frame, a buckling ring frame, a telescopic assembly, a machining assembly, a grinding assembly and a welding assembly. The adjusting ring frame is in transmission connection with one side of the supporting assembly through a gear and gear ring structure, one end of the adjusting ring frame is hinged to a buckling ring frame, a gear ring is arranged in the middle of the adjusting ring frame, a matching ring is arranged in the middle of the buckling ring frame, and the machining assembly is movably matched with the gear ring or the matching ring to move and provided with a grinding assembly and a welding assembly. Telescopic assemblies are arranged on the two sides of the gear ring and the matching ring correspondingly, and jacking pieces are arranged on the telescopic assemblies in the radial direction of the outer side of the pipeline. By means of the device, pipeline groove grinding and welding procedures can be continuously carried out, meanwhile, alignment work of large-diameter pipelines can be conveniently achieved, the construction procedures are simplified, and the construction efficiency is improved.

The utility model relates to the technical field of medical instruments, in particular to a catheter sheath base structure convenient to operate, which comprises a main body, and a fixing component is arranged on the side surface of the main body; a larger contact area can be provided through the widened rubber positions growing on the two sides of the sheath tube seat, medical staff can easily hold the sheath tube in the operation process, looseness or displacement caused by external force in the use process is effectively prevented, stress can be better dispersed through the widened rubber positions, and the safety performance of the sheath tube is improved. Shaking caused by movement or improper operation of a patient is reduced, so that the safety and the reliability of an operation are improved, the widened rubber position can provide a larger operation space for medical staff, the operation difficulty can be reduced, the working efficiency can be improved, and especially in an emergency, the clamping ring can move in the axial direction of the sheath tube base, so that the operation is more convenient. And the elastic fixing band is used for adjusting the insertion depth of the sheathing canal body and surrounds the outer side of the sheathing canal body, and the sheathing canal body is fixed and released through tensioning and loosening.

A portable and frameless folding cart capable of being folded without increasing the height; the cart includes: four vertical bars divided into front vertical bars and rear vertical bars; bottom sleeves mounted at bottom ends of the vertical bars; a first cross bar and a second cross bar which are mounted between the bottom sleeves; first retaining rings mounted at the bottom ends of the front vertical bars and second retaining rings mounted at the bottom ends of the rear vertical bars; first upright bars arranged rotatably and second upright bars arranged rotatably; hinge sleeves mounted on the second upright bars and hinged to the first upright bars; first rotating rings and second rotating rings mounted on the vertical bars; a first diagonal bar mounted on one of the first rotating rings and a second diagonal bar mounted on one of the second rotating rings.

The utility model discloses a multifunctional data line, two ends of the data line are respectively in adaptive connection with one end of a socket fixing member and one end of a joint fixing member, the other end of the socket fixing member is connected with a USB socket, and the socket fixing member is detachably and rotatably connected with a first protection clamp; the other end of the connector fixing piece is connected with a connector, and the connector fixing piece is detachably and rotationally connected with a second protection clamp. The first protection clamp and the second protection clamp are the same in structure. When the first protection clamp and the second protection clamp are rotated to be folded to coincide with the socket fixing piece and the connector fixing piece, the USB socket and the USB connector can be effectively protected from being scratched by external objects, and when the mounting holes of the first protection clamp and the second protection clamp are sleeved with the retaining rings, a user can hang the USB socket on a key chain to carry the USB socket. Therefore, the portability of the data line is improved, and the data line is safe and beautiful.

The invention relates to a split mounting type flower box which solves the problems that in the prior art, dismounting and mounting are tedious, the structural stability is poor, and adaptability is insufficient. According to the technical scheme, the box comprises a bottom support, an enclosure bulkhead and a retaining ring matched with the top end of the enclosure bulkhead, the edge of the bottom support is provided with an upper folding edge, the lower end of the enclosure bulkhead is a lower inserting edge which is folded inwards and turned downwards, and the lower inserting edge is inserted into the inner side of the upper folding edge and matched with the upper folding edge in an abutting mode. The upper folding edge is connected with and limits the lower inserting edge on the bottom support, and the retaining ring is used for limiting and fixing the upper end of the enclosure bulkhead, so that the enclosure bulkhead is in a fixed, stable and reliable cylinder shape. The multifunctional landscape lamp has the advantages of being stable and reliable in structure, convenient to disassemble and assemble, low in transportation and storage cost, high in function adaptability, good in durability and the like, and can be widely applied to various scenes such as urban landscaping and courtyard decoration.

This invention belongs to the field of mechanical transmission design, specifically relating to an easily detachable spline connection kit and its usage method. The invention proposes an easily detachable spline connection kit, including a spline connection structure and a disassembly fixture. The spline connection structure includes an inner spline shaft, a retaining ring, and an outer spline shaft. The inner spline shaft has an outer retaining ring groove in its shaft hole and an inner retaining ring groove in its shaft portion. Axial positioning is achieved by embedding a retaining ring in the outer and inner retaining ring grooves. The inner spline shaft has several axial retaining ring disassembly grooves spaced apart at the shaft hole opening, extending inward beyond the outer retaining ring groove. The disassembly fixture includes a sleeve and a screw. The sleeve has a clearance fit with the inner spline shaft and a threaded hole aligned with the retaining ring disassembly groove for screwing in the screw. Compared to existing structures, this significantly improves connection strength and reliability while also making disassembly easier.

A pressure relief structure for floating joint includes a hollow fixed retainer have an inner wall groove; an adapter joint having a first section assembled to the fixed retainer and a second section extended to a holed closed side of the fixed retainer, and a shoulder portion formed between the first and second sides; a slidable member including a base flange radially slidably attached to an outer wall surface of the closed side and a cylindrical portion extended into the fixed retainer to connect with the second section; an internal retaining ring set in the inner wall groove with an abutting surface flush with the shoulder portion; and an abutting washer pushed by a spring against the abutting surface and the shoulder portion to receive two supporting forces, enabling a reduced radial friction between the adapter joint and the abutting washer and reliable linear pipe connection via the floating joint.

A double retaining ring is provided. Either a first retaining ring or a second retaining ring is connected to a shaft seat and the other of the first retaining ring and the second retaining ring is connected to two receiving seats. The shaft seat has an axial hole. Each receiving seat has two fixing arms. An accommodating groove having an opening is formed between the fixing arms. The shaft passes through the axial hole and is inserted into the two accommodating grooves. Two rivet holes are provided on two sides of the shaft. Two rivets respectively pass through the rivet holes and the shaft is fixed to the fixing arms through the two rivets. The two rivets are breakable and the shaft is detachable from the accommodating grooves.

A polishing system includes a carrier arm having an actuator disposed on a lower surface of the carrier arm. The actuator includes a piston and a roller coupled to a distal end of the piston. The polishing system includes a polishing pad and a substrate carrier suspended from the carrier arm and configured to apply pressure between a substrate and the polishing pad. The substrate carrier includes a housing, a clasp, and a membrane. The substrate carrier includes an upper load ring disposed in the housing. The roller of the actuator is configured to contact the upper load ring during relative rotation between the substrate carrier and the carrier arm. The actuator is configured to apply a load to a portion of the upper load ring, thereby changing the pressure applied between the substrate and the polishing pad.

The utility model discloses an efficient integrated new energy PACK module connection structure which comprises a shell, and a battery integration cavity is formed in the shell. A fixing shell is fixedly arranged on the side, close to the shell, of the cover body, a threading ring is arranged on one side of the fixing shell, the threading ring is fixedly connected with the cover body, a wire clamping ring is arranged between the threading ring and the fixing shell, and a limiting rod is hinged to the wire clamping ring; by integrating the fixing shell for partitioning, arranging and fixing the wire harnesses on the cover body, the wire harnesses with different lengths and functions can be partitioned and fixed, the middle parts of the wire harnesses are hooked and pulled by using the wire clamping rings, and the specific positions of the wire clamping rings on the fixing shell are adjusted, so that the wire harnesses can be conveniently fixed. A plurality of wire harnesses are folded and straightened to be distributed and fixed in the fixing shell, meanwhile, the wire harnesses can be arranged in a partitioned mode through the multiple sets of wire penetrating rings, the wire harnesses can be arranged in the partitioned mode according to the functions of the wire harnesses, and subsequent connection between the wire harnesses is facilitated.

This utility model relates to the field of automotive repair technology, specifically to a transmission housing cleaning machine, including a cleaning tank. A connecting pipe is fixedly connected to the top of the cleaning tank, and a rotating assembly is provided at the bottom of the connecting pipe. The rotating assembly includes a first retaining ring, the inner ring of which is fixedly fitted onto the outer edge of the bottom of the connecting pipe, and the side surface of which is fixedly fitted onto the inner ring of a movable ring. The beneficial effect of this device is that, through the upper split pipe, the first upper nozzle, and the second upper nozzle, when the first and second upper nozzles, which have an inclined angle, spray cleaning fluid to clean the transmission housing, utilize the reaction force to cause the upper split pipe and the side split pipe to rotate. This eliminates the need to independently drive the transmission housing to rotate, ensuring thorough cleaning while reducing the required rotating structure and drive motor. Therefore, it avoids reduced assembly efficiency, high energy consumption, and corrosion of the transmission structure.

The present invention relates to a drive device (100) of a brake caliper (200), comprising a recirculating ball screw-nut assembly within a cylinder chamber (140) in a caliper body (145), wherein the recirculating ball screw-nut assembly comprises a threaded shaft (150) and a nut (160) screwed externally onto the threaded shaft (150), with external teeth (165) of the nut screw,wherein the threaded shaft (150) and the nut screw (160) extend in the direction of a drive axis (170) coaxial to the threaded shaft (150), and wherein the threaded shaft (150) extends in a direction of extension from a front end thereof to a rear end thereof to a thrust plate (180),in which an axial retaining ring (110) of the nut screw (160) is interposed between the external teeth (165) and the thrust plate (180) and held in position with the use of at least one fixing screw (120) comprising at least one respective tip (125),in which the axial retaining ring (110) has an inclined surface (111) on which a tapered side (121) of at least one respective tip (125) of at least one fixing screw (120) interferes.

A single-hand hook convenient to use comprises a hook body, an elastic lock rod and a telescopic spring. The hook body comprises a straight handle part, a bent hook part, a straight hook part and an extending part, a telescopic clamping groove with an opening in the upper end is formed in the straight handle part, the bent hook part is arranged on the outer side of the upper end of the straight handle part and bends and extends upwards, the straight hook part is arranged at the upper end of the bent hook part, and the straight hook part transversely extends and is located above the telescopic clamping groove; the extension part is arranged at one end of the straight hook part and extends downwards; the elastic locking rod is clamped in the telescopic clamping groove, the upper end of the elastic locking rod further abuts against the bottom of the straight hook part, and the telescopic spring is arranged in the telescopic clamping groove and arranged below the elastic locking rod. According to the utility model, the olecranon type extension structure extending downwards is designed, so that a user can easily and reliably hang and buckle the hook and the retaining ring in an aligned manner by only one hand, and the use convenience of the hook is greatly improved; the utility model has the advantages of strong practicability and strong popularization significance.

To provide a buckle that allows for smooth connection and requires no force to insert or remove. [Solution] The fitting base includes a top cover 10 and a fitting base 20. The top cover includes a first circular insertion part and a circular top cover. The fitting base includes a second circular insertion part and a circular base. The design of the top cover and fitting base allows the magnets M1 and M2 embedded in both to exert their magnetic force more effectively, resulting in smooth coupling between the top cover and the fitting base, requiring no force to insert or remove them, and fixing them together by magnetic force. Furthermore, the design of the second circular insertion part allows the fixed end to be fitted to its outer circumference or coupled to the bottom of the circular base.

The utility model relates to the technical field of grinding wheel machines, and discloses a grinding wheel machine of a quick grinding wheel replacing mechanism, which comprises a base, and a grinding wheel machine body is fixedly mounted on the top surface of the base. By arranging the disassembling mechanism, a first supporting ring, a first clamping ring and a second supporting ring are arranged for bolt installation, an internal grinding wheel disc is disassembled, then the interior of the grinding machine is cleaned, a grinding wheel is rapidly replaced, the time and energy needed by an operator for replacing the grinding wheel can be shortened, and the labor cost is reduced; a reloading mechanism is arranged, a second annular plate and a second supporting plate are mounted through a first U-shaped plate, and meanwhile, a second blade is mounted through threads, so that a grinding wheel can be quickly disassembled and reloaded, and the grinding machine can more flexibly adapt to different machining requirements; and therefore, the angle of the protection device can be conveniently adjusted, and sparks are prevented from splashing to harm the health of operators.

This application discloses a door hinge for a micro-pressure oxygen chamber, belonging to the field of micro-pressure oxygen chamber technology. It includes a fixed component and a rotating component, which are rotatably connected. The rotating component is equipped with a bearing assembly, which drives the fixed component to rotate. This application reduces the coefficient of friction during the rotation of the rotating shaft by setting multiple bearings at the top and bottom of the pin and the rotating shaft. Furthermore, the cooperation of the retaining ring and bearings ensures the rotational accuracy of the rotating shaft, thereby ensuring easy opening and closing of the micro-pressure oxygen chamber door. Multiple bearings distribute the force, extending the hinge's service life. The addition of a reinforcing plate increases the hinge's load-bearing capacity, preventing wear and deformation even after prolonged use. This prevents the door from shifting, better ensuring the door's sealing effect and improving user comfort. The hinge is simple to install, has a reliable fixing method, high load-bearing capacity, and an aesthetically pleasing appearance.

The utility model relates to the technical field of rotating beads, in particular to a jade bearing rotating bead which comprises a jade body, a cylinder is inserted into the jade body, and a threading rod is inserted into the cylinder. The bearings are inserted into the grooves formed in the upper end and the lower end of the cylinder, then the threading rod is inserted into the cylinder and the bearings, the positioning ring is connected to the outer wall of the fixing rod in a sleeving mode, the retaining ring is connected to the outer surface of the bottom end of the threading rod in a clamping mode, and the cylinder and the bearings are limited; finally, a threaded rod connected with one end of a control rod penetrates through a groove hole formed in the jade body to be rotationally connected into a threaded groove formed in the positioning ring, the jade body and the cylinder are connected, rotation of the jade body and the cylinder is facilitated, and therefore the assembly effect between the jade body and the cylinder is achieved, and the situation that due to high rope stringing friction force, the jade body and the cylinder cannot be assembled easily is avoided. And the rotation flexibility of the jade body is influenced.

The invention discloses a bicycle wheel hub architecture comprising a main axle (6) surrounded by a shaft sleeve (1) carrying an axle bearing (2) that supports rotation of a hub shell (7) together with a second hub bearing (14) which is positioned radially in a freehub body (15) enabling the hub shell (7) to rotate freely about the main axle (6); a brake‑side dropout spacer (3), a cassette‑side dropout spacer (17) and a spacer sleeve (16) for axial positioning; a cassette (18) secured by a cassette lockring (19); and a retaining ring (13) for axial retention; wherein the freehub body (15) couples inner (10) and outer (9) synchronization rings to a fixed toothed ring (8) which is mechanically fastened to the hub shell (7), and wherein a mechanical engagement is produced by axial motion of a set of outer (11) and inner (12) bellows along the shaft sleeve (1).

The application provides a transmission wheel mechanism and a substrate conveying device, which comprises a plurality of transmission wheel assemblies, each transmission wheel assembly comprising a rotating shaft and a transmission wheel connected with the rotating shaft, the plurality of rotating shafts are coaxially arranged in layers along the radial direction, and the plurality of transmission wheels are arranged in stacks along the axial direction; the rotating shaft of at least one transmission wheel assembly is provided with a groove one along the outer peripheral wall thereof, the transmission wheel of another transmission wheel assembly adjacent to the transmission wheel assembly provided with the groove one is provided with a groove two along the inner peripheral wall thereof, the groove one and the groove two are radially opposite to each other and jointly form an openable and closable annular limiting space; and the rotating connecting piece comprises an outer ring and an inner ring rotatable relative to the outer ring; wherein the rotating connecting piece is arranged in the openable and closable annular limiting space, the inner ring is arranged in the groove one, and the outer ring is arranged in the groove two, so that the two adjacent transmission wheel assemblies provided with the groove one and the groove two can relatively rotate. The application avoids the positioning structures such as additional shaft shoulders and retaining rings required by the installation of traditional bearings and reduces the axial and radial dimensions.

The utility model discloses a braking system and a vehicle with the same, and relates to the field of vehicle engineering. The braking system comprises a valve body, the valve body is provided with an oil passing channel, one end of the oil passing channel is an assembling opening, and the inner circumferential face of the oil passing channel comprises a step face facing the assembling opening; the liquid storage tank is provided with an oil outlet connector, and the oil outlet connector is located in the assembly opening; the filtering piece is located in the oil passing channel and arranged between the step face and the oil outlet connector, the filtering piece comprises a retaining ring, the retaining ring is annular, and the outer circumferential face of the retaining ring makes contact with the inner circumferential face of the oil passing channel for sealing; the filter screen is arranged on the retaining ring; the first supporting column is connected to the side, facing the assembling opening, of the retaining ring so as to abut against the oil outlet connector in the shaking process. The brake system is high in filtering reliability, and the service life of the brake system can be guaranteed.

This application discloses a positive pressure connector with a rotatable retaining ring, comprising an inner liner, a three-way outer shell, an elastic capsule, and a rotatable retaining ring. The three-way outer shell includes a connecting outer shell and a connecting side tube connected thereto. The two ends of the connecting outer shell are an installation port and a liquid inlet, respectively. The inner liner includes a connecting post and a stop plate. The stop plate is connected to the outside of the connecting post and to the installation port of the connecting outer shell. One end of the connecting post extends into the connecting outer shell and connects to the elastic capsule. An infusion inner hole is formed along the length of the end of the connecting post away from the elastic capsule. A communicating inner hole is formed along the radial direction on the connecting post. The two ends of the communicating inner hole communicate with the infusion inner hole and the inner cavity of the connecting outer shell, respectively. The rotatable retaining ring includes a rotating tube and a rotating ring plate connected to one end of the rotating tube. The rotatable retaining ring is rotatably connected to the connecting post through the rotating ring plate. This application effectively ensures the sealing and reliability of the positive pressure connector after locking the indwelling needle, and reduces the possibility of connector damage.

The invention discloses an opening method of a desilting bottom hole gate, which is realized through a gate body with a silt flushing function, the desilting bottom hole gate comprises a silt flushing pipeline arranged in the gate body, an inlet of the silt flushing pipeline is connected with a high-pressure water supply device on the outer side of the gate body, and an outlet of the silt flushing pipeline is arranged on an upstream face and a downstream face of the gate body. A check ring fixedly connected with the inner wall of the pipeline is arranged at an outlet of each silt flushing pipeline, and a fixing plate and a one-way opening fender are arranged on the outlet side of each check ring. The opening method comprises the steps that firstly, the high-pressure water supply device is started, the fender is opened under the action of the water flow pressure of an outlet of the silt flushing pipeline, silt deposited near the gate body is flushed away through silt flushing water flow, meanwhile, the deposited silt is disturbed, and after the opening resistance of the gate body is reduced, the gate body is opened. The operation mode that silt is flushed first and then the gate is opened is adopted, the gate opening force of the gate is reduced, the gate can be normally opened, silt in front of the gate is discharged to the downstream of a reservoir in time, and silt in a reservoir area is removed.

This utility model relates to the field of wind turbine technology, and in particular to a wind turbine impeller lock anti-loosening device, comprising: a bearing housing, a connecting assembly, a dovetail sleeve, a mounting rod, and an anti-rotation rod; a positioning pin is connected inside the bearing housing; the connecting assembly is connected to one end of the positioning pin and to the bearing housing; the connecting assembly includes a lead screw, a connecting seat, a retaining ring, a mounting bolt, and a magnetic rod; one end of the lead screw is connected to the connecting seat, the connecting seat is connected to the retaining ring, the retaining ring is connected to the mounting bolt and has through holes a on both sides, the through holes a and the magnetic rod are one-to-one, and one end of the lead screw is connected to a dovetail; the dovetail sleeve is connected to the lead screw through the dovetail; the outer wall of the dovetail sleeve is connected to the mounting rod, and the mounting rod is threadedly connected to the anti-rotation rod. The upper end of the anti-rotation rod is connected to the threaded rod, the threaded rod is threaded into the mounting hole, and the threaded rod can be rotated to adjust the length of the anti-rotation rod, conveniently increasing the stability and fit of the anti-loosening device with part of the frame, and improving the ease of use of the anti-loosening device.

Embodiments of the present application provide a polishing head, a polishing device, a polishing method, a processor and a storage medium. The polishing head comprises a base, a retaining ring arranged below the base, a polishing head air film arranged on the base and inside the retaining ring for holding a wafer, and a retaining ring air film arranged inside the retaining ring and between the retaining ring and the polishing head air film. When the retaining ring air film is pressurized and expanded, it is in contact with the edge of the wafer to exert a force on the edge of the wafer, and the force forms a radial clamping force and an axial downward pressure on the edge of the wafer. The radial clamping force can hold the wafer to prevent the wafer from moving during polishing, thereby reducing the risk of a slip sheet. The axial downward pressure can exert a pressing force on the edge of the wafer during polishing, which can more accurately control the polishing effect of the edge of the wafer and ensure the polishing consistency of the entire wafer surface.