63 results about "Pneumatic tool" patented technology

The utility model provides a raised head rivet disassembling auxiliary device which comprises a guide sleeve (1), a drill rod (2), a first bearing (3), a drill rod spring (4), a second bearing (5), a four-claw sliding block (6), a sliding block spring (7) and a drill bit (8), the guide sleeve (1) is in a barrel shape, a straight hole is formed in the upper end of the barrel shape, and a step hole is formed in the lower end of the barrel shape and used for installing the second bearing (5), the drill rod (2), the drill rod spring (4) and the first bearing (3); four sliding grooves are formed in the outer surface of the lower end of the barrel shape and used for installing a four-claw sliding block (6) and a sliding block spring (7), and the guide sleeve (1) provides an installation supporting structure for other parts. The drill rod (2) is in a round straight rod shape with a boss in the middle, the upper end of the drill rod is installed in the first bearing (3), the lower surface of the boss makes contact with the upper end of the drill rod spring (4), the lower end of the drill rod is installed in the second bearing (5), the drill rod (2) is used for transmitting power, and the upper end of the drill rod is connected with a pneumatic tool and a drill bit (8).

The invention relates to the technical field of drilling-dimpling combined pneumatic tool for supporting plate nuts, and particularly discloses a drilling-dimpling combined pneumatic tool for supporting plate nuts, which comprises a handle, a vent pipe hole is formed from the upper end face to the lower end face of the handle, and a working cavity is fixedly mounted at the upper end of the handle; a baffle is fixedly mounted in the working cavity, a movable baffle is slidably arranged on the left side of the interior of the working cavity, working rods are fixedly mounted on the two sides of the movable baffle, resistance cavities are fixedly mounted on the front side face and the rear side face of the working cavity, and the working rods are slidably mounted in the resistance cavities. The drilling and dimpling procedures are integrally completed, tools do not need to be frequently replaced, and the operation time is greatly shortened. Meanwhile, due to the integrated design of all the components, the consistency of tool positioning in the drilling and dimpling process is guaranteed, the coaxiality of the two working procedures is remarkably improved, the problem that the assembling precision is insufficient due to positioning deviation in traditional step-by-step operation is effectively solved, and the mounting quality and the connecting stability of the supporting plate nut are improved.

The invention relates to the technical field of industrial robots, and particularly discloses an intelligent mechanical arm for a processing machine tool of an integrated pneumatic tool bit changing mechanism, which comprises a mechanical arm body and a tool apron arranged on the mechanical arm body, the mechanical arm body comprises a driving motor and a rotating shaft connected with an output shaft of the driving motor, the tool apron comprises a mounting base, a tool handle and a tool clamping assembly, the tool handle and the tool clamping assembly are arranged on the mounting base, the tool apron is detachably connected with the rotating shaft through the tool handle, and the tool clamping assembly is used for mounting an external standard tool. And a pneumatic grabbing mechanism is arranged on the rotating shaft and is used for clamping or releasing the cutter handle, so that the cutter holder can be quickly mounted on and dismounted from the mechanical arm body. The pneumatic grabbing mechanism is arranged, clamping and releasing of the cutter handle are achieved by controlling air pressure, so that rapid replacement of the cutter holder is completed, the cutter clamping assembly is used for installing standard cutters of different models, and rapid switching among different process tasks is achieved.

The utility model provides a pneumatic tool for a cutting experiment, which comprises an angle grinder which comprises an angle grinder body, a handle and a transmission mechanism extending out of the bottom of the angle grinder body; the fixing ring is arranged on the outer side of the transmission mechanism in a sleeving manner; the fixing plate is mounted below the fixing ring through the fixing ring; the cam is arranged below the fixed plate and is connected with the transmission mechanism; the cam follower, the blade mounting plate and the blade are sequentially connected with the cam; under the driving of the transmission mechanism, the cam rotates, and then the blade is driven to do reciprocating cutting motion. According to the utility model, the structure of a common pneumatic tool is modified, the interaction effect between a blade and a cut object during manual cutting of an operator is simulated, huge physical output caused by manual cutting is avoided, and even the glue separation work between the inner and outer plates of the vehicle door can be completed by only one operator; and the working efficiency is greatly improved, and the labor cost is reduced.

The invention discloses a pneumatic tool, and relates to the field of pneumatic tools. The positioning frames are mounted on the bottom plate, and the positioning frames are used for limiting the placement positions of the workpieces; the positioning assembly is mounted on the bottom plate, and the positioning assembly is used for extruding the inner wall of the workpiece to fix the position of the workpiece; and the clamping assemblies are mounted on the bottom plate. Through the parallel bidirectional symmetrical push-pull function of the first air cylinder, the first steel ball positioning screws are driven to symmetrically abut against the inner wall of the workpiece, centering positioning and preliminary pressing of the workpiece are achieved, and the positioning symmetry degree is improved. And then, the second air cylinder and the third air cylinder are used for conducting auxiliary clamping on the workpiece, so that workpiece deformation caused by the first air cylinder is counteracted, and vibration in the machining process is reduced. And finally, the workpiece is vertically pressed through four fourth air cylinders, the machining displacement is further reduced, and therefore the machining precision is improved.

The invention discloses grinding and polishing equipment for machining a new energy battery rack base. The grinding and polishing equipment comprises a bed base serving as an equipment bearing foundation and a U-shaped hanging table fixed to the top wall of the bed base. The number of the hollow rotation assemblies is two, the two hollow rotation assemblies are installed on the left side and the right side of the top end of the machine base in a mirror symmetry mode, the rotating ends, away from each other, of the two hollow rotation assemblies are each provided with a four-corner type pneumatic tool, and the four-corner type pneumatic tools are used for centering and clamping the square single-hole base from four corners. The horizontal polishing assembly moves upwards in the hollow rotating assembly in the radial direction and makes contact with the inner hole wall of the single-hole base, the rotary driving assembly enables the hollow rotating assembly, the four-corner type pneumatic tool and the single-hole base workpiece to rotate by one circle or more, and in the process, the contra-rotating synchronous driving assembly drives key shaft telescopic structures on the left side and the right side to rotate; and the key shaft telescopic structure transmits power to the horizontal polishing assembly, so that inner hole polishing treatment is completed on the single-hole base workpiece in the autorotation process.

The utility model provides a waste gas exhaust back pressure silencer which comprises a first-stage silencing assembly communicated with an exhaust port of a pneumatic tool and a second-stage silencing assembly connected to the other side of the first-stage silencing assembly. The first-stage silencing assembly comprises a connecting body and a first shell arranged on the outer side of the connecting body in a sleeving mode, a pressure return cavity is formed between the first shell and the connecting body, and a channel communicated with the exhaust port is formed in the connecting body. The second-stage silencing assembly comprises a second shell connected to the connecting body and a plurality of flow dividing bases arranged in the axial direction of the shell, and a first silencing piece is arranged in a hole between every two adjacent flow dividing bases. An inner cavity is formed in the second shell, the channel communicates with the inner cavity, and second silencing pieces are arranged on the two sides of the flow dividing base correspondingly. According to the utility model, layer-by-layer silencing is carried out through the first silencing piece, and meanwhile, the two second silencing pieces are respectively arranged at the two ends of the second shell, so that the silencing purpose is achieved, the influence of noise on the environment when the pneumatic tool exhausts is met, and the comfort level of operators and the environmental safety are improved.

The utility model provides a novel pneumatic straight-through quick-insertion structure, and belongs to the technical field of quick-insertion structures. The quick insertion structure comprises an outer pipe and a stop block. A first cavity and a second cavity are formed in the outer pipe, and the first cavity communicates with the second cavity; the stop block is arranged in the outer pipe and used for limiting the stroke of the external connecting pipe, so that the external connecting pipe connected with the first cavity is located in the first cavity, and the external connecting pipe connected with the second cavity is located in the second cavity; the first cavity is provided with a first locking assembly, and the first locking assembly is used for locking an external connecting pipe connected with the first cavity; the second cavity is provided with a second locking assembly, and the second locking assembly is used for locking an external connecting pipe connected with the second cavity. The quick insertion structure has the effects of specifically improving the connecting efficiency of the air source and the pneumatic tool and the use safety.

1. Name of the product in this design: Radial Flexible Force Control Device. 2. Application of this design: for controlling the grinding force of power tools, pneumatic tools, instruments, and equipment. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The invention provides a silencing device for a pneumatic tool, which can obtain a high silencing effect. The silencer is mounted at a tool exhaust port of the pneumatic tool. The muffler device is provided with a device main body (32) and a bag body (34). The device main body has a flow path (46) extending from an opening (42) communicating with the tool exhaust port to a closed end (44), and a through path (48) penetrating the device main body in a direction intersecting the longitudinal axis (L) at a position between the opening and the closed end. The bag body has an expansion chamber (56) that communicates with the through-passage, and a vent hole that communicates the expansion chamber with the external space at a position separated from the through-passage in the longitudinal axis direction. The exhaust gas discharged from the tool exhaust port flows in the direction of the longitudinal axis in the flow path, flows into the expansion chamber through the through path in a direction intersecting the longitudinal axis, is blown toward the inner peripheral surface of the bag body, flows in the direction of the longitudinal axis in the expansion chamber, and is discharged to the outside space from the exhaust hole.

The utility model relates to the technical field of pneumatic tools, in particular to a pneumatic nailing gun piston driving structure based on ratchet clutch, which comprises an air cylinder, a piston, a firing pin and a piston driving component, a bulge is arranged on a firing pin shaft, and the piston driving component comprises a transmission shaft, a rotating disc, a connecting seat and a pawl. The rotating disc is provided with a ratchet wheel and a meshing element meshed with the protrusion of the firing pin, pawls which are centrosymmetric and vertically staggered at the tail ends are hinged to the connecting base, the head ends of the pawls are meshed with the ratchet wheel, the tail ends of the pawls are matched with the disengaging element, and the reset spring enables the head ends of the pawls to be tightly attached to the tooth face of the ratchet wheel. According to the driving structure, through the design of the double pawls, the meshing stability and durability are improved, abrasion and slipping are reduced, the overall structure is simple and efficient, and the maintenance cost is reduced.

The utility model relates to the field of pneumatic tool accessory production, in particular to a mould unit for an annular polyurethane polishing disk production line, the mould unit is mounted on a turntable of an annular production line, the mould unit comprises a bottom plate, a bottom mould and a cover mould, the bottom plate is mounted on the top surface of the turntable, the bottom mould is fixed on the bottom plate, the cover mould is rotatably connected to the bottom mould, and the cover mould is fixed on the turntable. The bottom die and the cover die can be rotationally opened or rotationally closed under the action of external force, a cooling module is arranged in the bottom plate, and a heating module is arranged in the bottom die; the mold has the advantages that the mold station adopts an automatic cover opening and closing structure, and the cover opening and closing angle can reach 180 degrees, so that a release agent can be automatically smeared conveniently; meanwhile, the heating module and the cooling module are arranged in the mold unit, so that a drying oven is omitted, and the cooling time is shortened; in addition, an electromagnet suction cup is further utilized, and releasing of mold cover opening and fastening of mold cover closing are achieved.

The application relates to the technical field of air compressors, in particular to an explosion-proof oil-free air compressor. The application comprises a support, an oil-free air compressor body installed on the support, a buffer structure arranged above the oil-free air compressor body, and an explosion-proof layer arranged between the buffer structure and the oil-free air compressor body. The buffer structure comprises a wire box, a box cover is installed on the wire box, a plurality of pressure relief grooves are arranged in an annular array on the box cover, a bottom disc is arranged on the inner side of the wire box, a buffer bin is rotatably arranged on the bottom disc, and wire holes are arranged on the side of the buffer bin. The application realizes explosion blocking at the power supply wiring position, bidirectional explosion-proof of bearings, heat dissipation and gas internal circulation pressure relief in the air compressor, and can safely provide power for drilling pneumatic tools.

The invention provides an energy-saving air compressor with variable rotating speed, and relates to the technical field of air compressors. The device comprises an air storage tank, a machine head, a rear frame assembly, a filtering assembly, a high-pressure electromagnetic valve, a multifunctional frame, a telescopic assembly, a positioning assembly and a lock catch assembly, a wheel set and supporting legs are arranged on the lower portion of the air storage tank, and the rear frame assembly is arranged on the side, close to the wheel set, of the air storage tank and used for providing supporting force in a vertical state and providing a protection effect on the machine head; the filtering assembly is arranged at the air inlet end of the machine head and used for filtering air entering the machine head and backflushing the filter element through high-pressure air in the air storage tank; and the high-pressure electromagnetic valve is arranged on the outer side of the filtering assembly. Through the arrangement of the multifunctional frame, the telescopic assembly, the positioning assembly and the lock catch assembly, the multifunctional frame can be suitable for various use forms, tool placement positions can be provided, tools are prevented from being mistakenly treaded and damaged, pneumatic tools can be conveniently replaced for use, and cleanliness of a use site is guaranteed.

The utility model belongs to the pneumatic tool technical field, especially point to a kind of pneumatic polisher;Including shell, the polishing mechanism of setting in the front end of shell and the air inlet of setting in the rear end of shell, outlet, hinge seat is provided in the rear end of shell, the rear end of trigger, the front end of shroud are all hinged with hinge seat, and there is provided on the shroud the avoidance window for trigger to pass;The utility model shroud is closed, and the hand of operator forms support on shroud, reduces the fatigue feeling of long-time operation, improves the comfort of operation.The layout of avoidance window ensures that trigger operation is not disturbed, and the protection and operation flexibility are considered.Shroud is opened, and it is convenient to replace corresponding parts.

The utility model discloses a tensioning tool for a copper bar of a copper bar rotor, and the tensioning tool for the copper bar of the copper bar rotor comprises a tool body and an adjustable tool pier head. The tool body is used for being connected with a pneumatic tool. The adjustable tool pier head is installed at the head end of the tool body and comprises a fixed pier head body and a movable pier head body. The fixed pier head body is fixed at one end of the tool body; the movable pier head body is connected with the fixed pier head body through an adjusting assembly, and the distance between the fixed pier head body and the movable pier head body is adjusted. According to the utility model, the problem that the rotor conducting bar of the aluminum row cast-aluminum rotor slides after being put into the cast-aluminum rotor groove profile is solved.

The application provides an energy-saving variable-speed energy-saving air compressor, and relates to the technical field of air compressors. The energy-saving variable-speed energy-saving air compressor comprises a gas storage tank, a machine head, a rear frame assembly, a filter assembly, a high-pressure electromagnetic valve, a multifunctional frame, an extension assembly, a positioning assembly and a lock assembly. The lower part of the gas storage tank is provided with a wheel set and supporting feet. The rear frame assembly is arranged on the side of the gas storage tank close to the wheel set, and is used for providing supporting force in a vertical state and providing a protection function for the machine head. The filter assembly is arranged at the air inlet end of the machine head, and is used for filtering the entering air and back-flushing the filter element by using the high-pressure gas in the gas storage tank. The high-pressure electromagnetic valve is arranged on the outer side of the filter assembly. The multifunctional frame, the extension assembly, the positioning assembly and the lock assembly can not only be suitable for various use modes, but also can provide tool placing positions, so that the tools are prevented from being damaged by being stepped on by mistake, the pneumatic tools are convenient to replace and use, and the use site is ensured to be clean.

The utility model relates to the technical field of pneumatic tool valve seats, and discloses a novel pneumatic tool valve seat which comprises a valve body, an air inlet pipe and an air outlet pipe are arranged on the two sides of the valve body respectively, a fixing platform is arranged at the bottom of the valve body, and a connecting flange is arranged at the top of the valve body. A valve body is arranged in the middle of the valve seat, and the appearance of the valve body is arranged to be a cuboid. According to the utility model, the air inlet pipe and the air outlet pipe are respectively provided with the sealing threads and are matched with the high-smoothness design of the mounting hole, so that the sealing performance in the gas transmission process is greatly improved, the gas leakage is reduced, the pneumatic tool is ensured to obtain stable and sufficient power, and the working efficiency and the performance of the pneumatic tool are effectively improved. And through the arrangement of the exhaust hole, air can be automatically exhausted to adjust the air pressure when the system air pressure is too high, and pneumatic tools or pipelines are prevented from being damaged by too high pressure.

To provide a noise reduction device for pneumatic tools that can achieve a higher noise reduction effect. [Solution] The silencing device 30 is attached to the tool exhaust port 22 of the pneumatic tool 1. The silencing device 30 comprises a device body 32 and a bag body 34. The device body 32 has a flow path 46 extending from an opening 42 communicating with the tool exhaust port 22 to a closed end 44, and a through passage 48 that penetrates the device body 32 in a direction intersecting the longitudinal axis L at a position between the opening 42 and the closed end 44. The bag body 34 has an expansion chamber 56 communicating with the through passage 48, and an exhaust hole 58 that connects the expansion chamber 56 to the outside space at a position away from the through passage 48 in the direction of the longitudinal axis L. The exhaust gas discharged from the tool exhaust port 22 flows through the flow path 46 in the direction of the longitudinal axis L, passes through the through passage 48 and enters the expansion chamber 56 in a direction intersecting the longitudinal axis L, is blown onto the inner circumferential surface 34a of the bag body 34, flows within the expansion chamber 56 in the direction of the longitudinal axis L, and is exhausted to the outside space through the exhaust hole 58.

The utility model relates to the technical field of wind turbine mechanical engineering provides high -strength bolt fastening frock of wind turbine, including frock body, positioning structure, and elastic coupling structure, frock body is provided with at least two positioning holes, and the adjacent positioning hole forms a limit position on frock body between, two positioning structures are oppositely established, two positioning structures are movably established on frock body, wherein a positioning hole is formed on the elastic coupling structure, a plurality of installation cavities and elastomer are axially provided in the elastic coupling structure, a plurality of installation cavities are arranged along the circumferential direction of the elastic coupling structure, and the elastomer is arranged in the installation cavity. The utility model can adapt to the blade bolt with flat protrusion, so as to solve the problem that the existing electric wrench cannot directly apply pre-tightening force to the blade bolt, the fastening frock can be used with electric or pneumatic tool, thereby realizing mechanization, automatic fastening operation.

1. The name of the design product: hard alloy mortar chisel. 2. The use of the design product: hard alloy mortar chisel used in pneumatic tools for cleaning mortar and mortar joint. 3. The design points of the design product: in shape. 4. The picture or photo best indicating the design points: perspective view 1.

This utility model relates to the field of pneumatic tool technology, and in particular to a blade mounting structure for an eccentric movable vane pneumatic motor. The utility model mainly consists of a stator, rotor, radial groove, first permanent magnet, spring, second permanent magnet, blade, oil guide block, and wear-resistant rubber block. These components work together. By adding a first and second permanent magnet, capable of generating repulsive force, to the radial groove of the rotor, the reliability of the reciprocating radial displacement of the blade is ensured in conjunction with the spring. An oil storage chamber is provided in the blade to store lubricating oil. A wear-resistant rubber block is installed on the outer end of the blade via a snap-fit ​​oil guide block. The oil guide groove in the oil guide block directs the oil from the storage chamber into the wear-resistant rubber block. The oil-soaked wear-resistant rubber block replaces the blade in contact with the inner wall of the stator. The wear-resistant rubber block has self-deformation capability, preventing damage when in contact with the inner wall of the stator. Simultaneously, the lubricating oil further enhances the lubrication effect.

The utility model discloses a derusting polisher which comprises a barrel and a brush nail assembly, a hollow circular inner cavity is arranged in the middle of the barrel, a positioning inner hole is arranged at one end of the barrel towards the inner hole direction, the inner hole of the positioning inner hole is smaller than the inner hole of the inner cavity, and the brush nail end of the brush nail assembly enters from the barrel and penetrates through the positioning inner hole. The plane end of the brush nail assembly is located in the inner cavity of the barrel, and a large spring is installed between the plane end of the brush nail assembly and the positioning inner hole. The utility model has the beneficial effects that the equipment is small in size, can be used for derusting any corner, strengthening the hardness of a metal surface, chiseling and shoveling off a wall skin, can use an electric tool or a pneumatic tool as a power source, is low in cost, avoids the danger of derusting by an angle grinder on the market, and also has no high environmental pollution caused by chemical derusting.

The objective is to provide an air tool that operates by operating an opening / closing mechanism in a direction different from the direction of movement of the valve piston of the air valve. [Solution] The air tool of the present invention is an air tool in which a drive unit is operated by compressed air, and comprises a tool body having an air valve arranged in a supply path for compressed air to the drive unit, and an opening / closing operation unit for opening and closing the air valve, wherein the air valve has a valve piston that opens and closes the air valve by reciprocating between a closed position and an open position, and the opening / closing operation unit moves in a second direction that intersects with a first direction which is the direction of movement of the valve piston, thereby causing the valve piston to move from the closed position to the open position.

The utility model relates to the technical field of pneumatic tools, and discloses a novel pneumatic tool swing arm which comprises a main body, two symmetrical side plates are fixedly connected outside the main body, the main body is of a triangular structure, each side plate is of a rectangular structure, an upper connecting hole is formed in the upper portion of each side plate, a lower connecting hole is formed in the lower portion of each side plate, and the upper connecting holes are communicated with the lower connecting holes. The upper connecting hole and the lower connecting hole are both of a circular structure, and the upper connecting hole and the lower connecting hole are both used for being connected with an operation input component. According to the utility model, through the reasonable geometric shape design of the swing arm, on the premise of ensuring the use, the size and the weight of a product are reduced to the greatest extent, the casting and processing cost is reduced, and the production efficiency is improved; besides, high-strength aluminum alloy is selected as a material, so that the strength and the wear resistance of the swing arm are improved, normal operation of equipment is ensured, and the service life of the equipment is prolonged.

This application discloses a drag-type dual-power plate vibrator. The invention includes a base, with two sets of fixing plates installed between the inner walls of the front and rear sides of the base. An oscillation mechanism that drives the base to vibrate is provided on the upper surface of the two sets of fixing plates. A positioning mechanism that restricts the movement of the oscillation mechanism is installed at the bottom of the inner wall of the base. By inserting a high-pressure air pipe from the coal mine into the air inlet of the oscillation mechanism, the oscillation mechanism drives the base to vibrate. This allows the high-pressure air pipe to blow high-pressure air to power the oscillation mechanism instead of electricity. Since high-pressure air pipes are installed in all underground coal mine roadways, and pneumatic tools are widely used in coal mines, this device is easy to promote and convenient to use, thus effectively solving the explosion-proof limitation problem of electrical equipment in coal mines and improving the practicality of the device.

This utility model relates to a quick-connect and disconnection device, particularly a pneumatic quick-connect coupling. The pneumatic quick-connect coupling includes a male connector and a female connector. The male connector includes a plug, with a smooth wall a and a beveled wall a on the front outer wall from front to back. A ball-holding groove is provided on the rear side of the beveled wall a. The female connector includes a housing, with a housing connector body fitted onto the rear outer wall of the housing. A valve sleeve is provided at the connection between the housing and the housing connector body. A bushing is provided on the front inner wall of the housing, with a valve core behind the bushing. A valve core spring is provided between the valve core and the valve sleeve. An outer sleeve is fitted onto the front outer wall of the housing, connected to a steel ball. The steel ball is located in a through hole in the housing. An outer sleeve spring is provided between the outer sleeve and the housing connector body. The advantages of this utility model are: novel structure, ingenious and simple design, no valve core or valve seat in the plug, ensuring large flow rate, and single-handed operation. It features a single-open / close valve and can be used as a pneumatic tool, testing and control equipment, and for compressed air.

The utility model relates to the technical field of pipe bending equipment, in particular to a pipe bending device for air conditioner condenser production, which comprises a machine base and a support, a feeding pipe is arranged in the middle of the top surface of the machine base in a left-right sliding mode, a hydraulic chuck is fixedly communicated and installed at the left end of the feeding pipe, and a first pneumatic tool clamp is arranged on the left rear portion of the hydraulic chuck. A second pneumatic tool clamp is arranged on the left side of the first pneumatic tool clamp, a bending groove module is arranged in front of the second pneumatic tool clamp in a relatively static mode, the bending groove module is rotationally connected with the left end of the machine base, the support is located on the left side of the machine base, a transmission box is arranged on the top face of the support in a sliding mode, and two clamping blocks are movably arranged at the right end of the transmission box. According to the pipe bending device for air conditioner condenser production, the basic pipe bending process can be completed, meanwhile, the bent pipes can be automatically discharged and transferred, manual taking and disassembling are not needed, only new pipes need to be put in, more time and labor are saved, and the bending efficiency is indirectly improved.

The utility model relates to the field of pneumatic tools and accessories, in particular to a polyurethane polishing disc with a variable polishing surface, which comprises a base, a connecting piece is arranged at the center of the back of the base, a first polyurethane layer is arranged on the front of the base, and a first magic tape layer is arranged on one side, far away from the base, of the first polyurethane layer; the outer ring seat is detachably connected with the base, a second polyurethane layer is arranged on the front face of the outer ring seat, a second hook-and-loop fastener layer is arranged on the side, away from the outer ring seat, of the second polyurethane layer, the first polyurethane layer is flush with the second polyurethane layer, and the first hook-and-loop fastener layer is flush with the second hook-and-loop fastener layer; the polishing device has the advantages that the outer ring seat detachably connected is arranged on the periphery of the base, so that the size of a polishing surface can be changed, large-area polishing can be performed when the outer ring seat is not detached, the polishing area is reduced after the outer ring seat is detached, and secondary polishing and grinding can be performed on a thin part of a workpiece and an area which is difficult to touch by a large-area polishing disc; and in the aspects of preparation and management of accessories, compared with an existing scheme, the management difficulty can be greatly reduced.