CN220348028U - Polishing disc rotation device and polishing system of rotatable polishing disc - Google Patents

Abstract

The utility model discloses a polishing disc rotation device and a polishing system of a rotatable polishing disc, wherein the polishing disc rotation device comprises a rotation mechanism, a rotating arm arranged on a rotation output end of the rotation mechanism, a first buffer and a second buffer arranged on the rotation mechanism and a limiting part arranged on the rotation output end and used for horizontally limiting the polishing disc, and the first buffer and the second buffer are respectively propped against the rotating arm of 0 degree and 180 degrees; the polishing system of the rotatable polishing disc comprises a polishing machine, a polishing disc rotating device, a picking and placing manipulator, a polishing disc rotating device and a polishing disc picking and placing manipulator, wherein the polishing disc rotating device is used for picking and conveying polishing discs which are required to rotate on the polishing machine to the polishing disc rotating device, and the picking and placing manipulator is used for picking and conveying the polishing discs which are rotated by the polishing disc rotating device to the polishing machine. The automatic grinding disc grinding machine can automatically rotate the grinding disc, improves the utilization rate of grinding consumable materials, saves cost, does not need manpower, saves time, improves production efficiency, and simultaneously eliminates potential safety hazards caused by manual operation.

Description

Polishing disc rotation device and polishing system of rotatable polishing disc

Technical Field

The utility model relates to the technical field of polishing machinery, in particular to a polishing disc rotation device and a polishing system with a rotatable polishing disc.

Background

When polishing electronic products such as notebook computers, only the first half part of polishing consumables is usually used, in order to improve the utilization ratio of polishing consumables, staff can reduce the waste of polishing consumables through manual rotation 180 degrees replacement and pasting modes, but the mode has the problems of slow manual pasting speed, low production efficiency, potential safety hazard and the like. It is therefore important to improve the technical development as to how to increase the utilization of sanding consumables while ensuring safety and as much time-saving as possible.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model aims to solve the technical problems that: the polishing disc rotation device and the polishing system of the rotatable polishing disc are provided, and the utilization rate of polishing consumables is improved under the condition that safety is guaranteed and time is saved as much as possible.

In order to solve the technical problems, the utility model adopts a technical scheme that: the utility model provides a rotation device of grinding disc, including rotary mechanism, set up in the swinging boom on rotary mechanism's the rotatory output, set up in first buffer and the second buffer on the rotary mechanism and set up in on the rotatory output and be used for the spacing portion to grinding disc level limit, first buffer and second buffer offset with 0 degrees and 180 degrees swinging boom respectively.

Further, the rotating mechanism is provided with a connecting arm distributed along the length direction of the connecting arm, the connecting arm is distributed outside one side of the rotating output end, the connecting arm is symmetrically arranged by taking the central axis along the width direction of the rotating mechanism as a symmetrical axis, and the first buffer and the second buffer are symmetrically arranged at two ends of the connecting arm.

Further, the rotation mechanism is defined as a swing cylinder having a cylindrical rotation table, and the rotation arm is formed to extend outwardly from an outer wall of the rotation table.

Further, the connecting arm is arranged on the shell of the swing cylinder along the length direction of the swing cylinder, a concave cambered surface is formed on the part, close to the rotary table, of the connecting arm, which is opposite to the rotary table, a plurality of fixing lugs are formed on the outer side of the connecting arm in a protruding mode, and coaxial fixing holes are formed in the shell and the fixing lugs.

Further, the limiting part comprises a limiting plate arranged on the rotary output end, a first limiting convex part arranged on the upper surface of the limiting plate and close to a long side, and a second limiting convex part arranged on the limiting plate and close to a short side, and a placing area for placing the polishing disc is formed in an area, located on the limiting plate, surrounded by the first limiting convex part and the second limiting convex part.

In order to solve the technical problems, the utility model adopts another technical scheme that: the polishing system comprises a polishing machine, the polishing disc rotating device, a picking and placing manipulator, wherein the polishing disc rotating device is used for picking and conveying a polishing disc which needs to be rotated on the polishing machine to the polishing disc rotating device and the picking and placing manipulator is used for picking and conveying the polishing disc which is rotated by the polishing disc rotating device to the polishing machine.

Further, the polisher includes the polisher body and can dismantle set up in polish on the polisher body, the polisher body has a mount pad, polish including one with the mount pad can dismantle the detachable seat of being connected and set up in can dismantle keep away from on the seat polish the disk body of mount pad one end.

Further, the mounting seat comprises a base connected with the grinding machine body and a connector arranged at the upper end of the base, and a plurality of third limit protruding parts capable of elastically stretching along the radial direction are distributed on the periphery of the connector; the detachable seat is provided with a lantern ring which can be sleeved on the periphery of the connector, and a limiting concave part which is in limiting fit with the third limiting convex part is arranged on the inner peripheral wall of the lantern ring at a position corresponding to the third limiting convex part.

Further, the base is provided with a hollow air cavity, and a first air inlet pipe joint and an air outlet pipe joint which are communicated with the air cavity are arranged on the outer side wall of the base; a through hole communicated with the air cavity is formed in the connecting head in the vertical direction, a push rod is movably arranged in the through hole, a sliding hole for the connecting head to movably penetrate through is formed in the connecting head at a position corresponding to the third limit convex part, the inner end of the sliding hole is communicated with the through hole, and the outer end of the sliding hole penetrates through the connecting head in the radial direction; the third limit convex part is limited to be a limit column in sliding fit with the sliding hole, the inner end of the limit column inwards protrudes into the through hole and is connected with the hole wall of the through hole through a spring, and the outer end of the limit column can outwards protrude from the outer wall surface of the connector; when the air source enters the air cavity, the push rod is pushed to move upwards to the position of the limit post, the peripheral wall of the push rod is extruded outwards to form the limit post, and the outer end of the limit post is extruded outwards to form the outer wall surface of the connector.

Further, the push rod is provided with a cylindrical section matched with the aperture of the through hole and a conical section which is formed at the upper end of the cylindrical section and gradually reduces in diameter upwards.

The polishing disc rotation device and the polishing system of the rotatable polishing disc have at least the following beneficial effects: the utilization rate of polishing consumables is improved and the cost is saved by rotating the polishing disc; the grinding disc is automatically rotated through the rotating device, so that labor is not needed, time is saved, production efficiency is improved, and potential safety hazards caused by manual operation are eliminated.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:

FIG. 1 is a schematic view of a structure of an embodiment of a sanding disc rotating device according to the present utility model;

FIG. 2 is a schematic view of a polishing disc rotation device with a limit portion removed;

FIG. 3 is a schematic diagram of an embodiment of a polishing system of the rotatable polishing disc of the present utility model;

FIG. 4 is a schematic view of a polishing machine body in an embodiment of a polishing system with a rotatable polishing disc according to the present utility model;

FIG. 5 is a schematic view of the drive structure of an embodiment of the polishing system of the rotatable polishing disc of the present utility model;

FIG. 6 is a cross-sectional view of a drive structure in one embodiment of a grinding system of the rotatable grinding disc of the utility model;

FIG. 7 is a schematic view of a rotational assembly of an embodiment of a polishing system of the rotatable polishing disc of the present utility model;

FIG. 8 is a schematic view of a mount in a ventilated state in an embodiment of a polishing system of a rotatable polishing disc of the present utility model;

FIG. 9 is a cross-sectional view of a mount in an unvented state of an embodiment of a polishing system of the rotatable polishing disc of the present utility model;

fig. 10 is a schematic structural view of the sanding disc.

The meaning of the reference numerals in the drawings are:

a sanding disc rotating device 1; a rotation mechanism 11; a cylinder 111; a rotary table 112; a connection arm 113; a fixing lug 1131; a rotating arm 12; a first buffer 13; a second buffer 14; a limit part 15; a limiting plate 151; a first limit protrusion 152; a second limit protrusion 153;

a polisher 2; a grinder body 21; a housing 211; a second intake pipe joint 2111; an exhaust port 2112; a drive structure 212; a lower bracket 2121; a first central hole 2121a; a first ring 2121b; a rotating assembly 2122; eccentric barrel 2122a; an intake port 2122a1; an air outlet 2122a2; an inner groove 2122a3; a concentric wheel 2122b; a second central bore 2122b1; slots 2122b2; blade 2122c; an upper bracket 2123; a third central bore 2123a; a rotation shaft 2124; bearings 2125; eccentric 2126; a pin 2127; a mounting base 213; a base 2131; air cavity 2131a; a first air intake pipe joint 2131b; a gas outlet fitting 2131c; stop 2131d; a connecting head 2132; a through hole 2132a; a push rod 2132b; a third limit protrusion 2132c; slide hole 2132d; trapezoidal block 2132e; a connection block 2132f; 2132g of spring; a stop bar 2132h; a vibration plate 214; polishing disc 22; a removable seat 221; limit recess 2211; sanding disc body 222.

Detailed Description

The utility model is further described below with reference to the accompanying drawings.

Referring to fig. 1 and 2, the polishing disc rotation device of the present embodiment includes a rotation mechanism 11, a rotation arm 12 disposed on a rotation output end of the rotation mechanism 11, a first buffer 13 and a second buffer 14 disposed on the rotation mechanism 11, and a limiting portion 15 disposed on the rotation output end and used for horizontally limiting a polishing disc 22.

The rotation mechanism 11 is defined as a 180-degree swing cylinder. The swing cylinder has a cylinder body 111 and a rotary table 112 as the rotation output end provided on the cylinder body 111, the rotary table 112 has a cylindrical shape, and the rotary arm 12 is formed by extending outward from an outer wall of the rotary table 112. The cylinder 111 is provided with a connecting arm 113 at a position outside one side of the turntable 112, the connecting arm 113 is distributed along the length direction of the cylinder 111, and the connecting arm 113 is symmetrically arranged with a central axis along the width direction of the cylinder 111 as a symmetry axis. The connecting arm 113 is close to a side surface of the rotating table 112, and forms an inward concave cambered surface adapted to the outer wall of the rotating table 112 at a position opposite to the rotating table 112, a plurality of fixing lugs 1131 are formed by protruding outwards from a side surface of the connecting arm 113, which is close to the rotating table 112, and coaxial fixing holes are formed in the fixing lugs 1131 and the cylinder body 111. When assembling the connecting arm 113, the fixing hole on the connecting arm 113 is aligned with the fixing hole on the cylinder 111, and then the bolt is fastened to the fixing hole on the cylinder 111 after passing through the fixing hole on the connecting arm 113.

The first buffer 13 and the second buffer 14 are symmetrically disposed at two ends of the connecting arm 113, and buffer end surfaces of the first buffer 13 and the second buffer 14 are located on the same plane. The rotating arm 12 is respectively abutted against the first buffer 13 and the second buffer 14 when in two states of 0 degree and 180 degrees, and the first buffer 13 and the second buffer 14 can control the rotating arm 12 not to swing excessively, so that the accuracy of the rotating position is ensured.

The limiting portion 15 includes a limiting plate 151 disposed on the rotating table, a first limiting protrusion 152 disposed on an upper surface of the limiting plate 151 and near a long side, and a second limiting protrusion 153 disposed on the limiting plate 151 and near a short side. In the illustrated embodiment, the limiting plate 151 is defined as a rectangular plate having two opposite long sides and two opposite short sides, one of the first limiting protrusions 152 is disposed at one long side, one of the second limiting protrusions 153 is disposed at each of the two short sides, the two second limiting protrusions 153 and one of the first limiting protrusions 152 are configured in a triangular relationship, and the enclosed area forms a placement area for placing the polishing pad 22. It should be understood that the structure of the limiting portion 15 is not limited to the above embodiments, for example, in some embodiments, the upper surface of the limiting plate 151 may be provided with the first limiting protrusion 152 near both long sides, and in this embodiment, the first limiting protrusion 151 is provided only at one side in order to leave the other side as the opening of the placement area for facilitating placement of the polishing disc 22.

The polishing disc rotation device of this embodiment is assembled as follows: (one) fitting the connection arm 113: firstly, aligning the fixing holes on the connecting arm 113 with the fixing holes on the cylinder 111, and then, locking the bolts on the fixing holes on the cylinder 111 after passing through the fixing holes on the connecting arm 113; (II) first buffer 13 and second buffer 14 are assembled: the buffer end faces of the first buffer 13 and the second buffer 14 are positioned on the same plane (0 degree and 180 degrees); (II) assembling a limiting plate 151: the limiting plate 151 is attached to the rotary table 112 by screws.

Referring to fig. 3, the present utility model further discloses a polishing system with a rotatable polishing disc, which includes the polishing disc rotating device 1, the polishing disc 2, a pick-and-place manipulator (not shown) for picking and delivering the polishing disc 22 to be rotated on the polishing disc 2 to the polishing disc rotating device 1, and for picking and placing the polishing disc 22 rotated by the polishing disc rotating device 1 to the polishing disc 2. The polishing disc rotation device 1 can be referred to the description of the above embodiments, and will not be described in detail here.

Referring to fig. 4 to 7, the polishing machine 2 includes a polishing machine body 21 and a polishing disc 22 detachably disposed on the polishing machine body 21. The sander body 21 may be any conventional square pneumatic sander body structure. In the illustrated embodiment, the sander body 21 includes a housing 211, a drive structure 212 disposed within the housing 211, and a mounting seat 213 disposed at an upper end of the housing 211. The driving structure 212 includes a lower bracket 2121, a rotating assembly 2122, an upper bracket 2123, and a rotating shaft 2124 passing through the lower bracket 2121, the rotating assembly 2122 and the upper bracket 2123 and rotating with the rotating assembly 2122, which are sequentially disposed in the housing 211 from bottom to top.

The lower support 2121 is provided with a first central hole 2121a through which the rotating shaft 2124 movably passes, a first ring body 2121b surrounding the first central hole 2121a is arranged on the lower surface of the lower support 2121, a bearing 2125 is fixedly arranged in the first ring body 2121b, and the lower end of the rotating shaft 2124 passes through the inner ring of the bearing 2125 and is fixedly connected with the inner ring.

The rotating assembly 2122 includes an eccentric cylinder 2122a eccentrically disposed on the lower bracket 2121, and a concentric wheel 2122b disposed inside the eccentric cylinder 2122a and sleeved outside the rotating shaft 2124. An air inlet 2122a1 is provided on the outer side wall of the eccentric cylinder 2122a at a position infinitely close to the concentric wheel 2122b, and the air inlet 2122a1 communicates with a second air inlet joint 2111 provided on the housing 211. An air outlet 2122a2 is further disposed on the outer wall of the eccentric barrel 2122a, the outer wall of the eccentric barrel 2122a corresponding to the air outlet 2122a2 is concave inwards to form an inner groove 2122a3, the inner groove 2122a3 enables an air outlet channel to be formed between the outer wall of the eccentric barrel 2122a and the outer shell 211, and the air outlet channel is communicated with an air outlet 2112 disposed on the outer shell 211.

The concentric wheel 2122b is coaxially disposed with both the rotational shaft 2124 and the lower bracket 2121, and the concentric wheel 2122b is keyed to the rotational shaft 2124. The concentric wheel 2122b has a second central hole 2122b1 through which the rotating shaft 2124 passes, the concentric wheel 2122b is provided with a plurality of slots 2122b2, the slots 2122b2 are distributed on the concentric wheel 2122b in a radial manner with the second central hole 2122b1 as a center, each slot 2122b2 penetrates through the concentric wheel 2122b along the coaxial axis of the concentric wheel 2122b, each slot 2122b2 penetrates through the outer wall of the concentric wheel 2122b outwards along the radial direction of the concentric wheel 2122b, each slot 2122b2 is inserted with a blade 2122c, and the blade 2122c can be in sliding fit with the slot 2122b2 along the radial direction of the concentric wheel 2122b.

The upper bracket 2123 is press-fitted to the upper ends of the eccentric cylinder 2122a and the concentric wheel 2122b, a third central hole 2123a coaxial with the first central hole 2121a and the second central hole 2122b1 is provided on the upper bracket 2123, and the upper end of the rotating shaft 2124 is inserted into the third central hole 2123 a. An eccentric wheel 2126 is arranged on the upper end ring of the rotating shaft 2124, a pin 2127 is arranged on the upper end surface of the rotating shaft 2124, the rotating shaft 2124 penetrates out of the shell 211 upwards and then is connected with a vibrating plate 214, and a pin hole matched with the pin 2127 is formed in the vibrating plate 214.

The driving structure 212 operates as follows: the ventilated air enters from the air inlet 2122a1 and blows the concentric wheel 2122b to rotate, and the centrifugal force makes the blade 2122c swing outwards to the maximum extent (i.e. against the inner wall of the eccentric cylinder 2122 a), so that the air flow impact area is enlarged, and further rotational power is generated to drive the rotating shaft 2124 to rotate, and the rotating shaft 2124 and the pin 2127 co-act to make the vibration plate 214 vibrate.

Referring to fig. 8 and 9, the mounting base 213 includes a base 2131 connected with the polishing machine body 21 and a connecting head 2132 disposed on the base 2131. The base 2131 has a hollow air cavity 2131a, a first air inlet pipe joint 2131b and an air outlet pipe joint 2131c which are communicated with the air cavity 2131a are arranged on the outer side wall of the base 2131, and two stop blocks 2131d are symmetrically arranged on the cavity wall of the air cavity 2131a along the central axis of the air cavity 2131 a. A through hole 2132a communicated with the air cavity 2131a is arranged on the connecting head 2132 along the vertical direction, a push rod 2132b is movably arranged in the through hole 2132a, and the push rod 2132b is provided with a cylindrical section matched with the aperture of the through hole 2132a and a conical section which is formed at the upper end of the cylindrical section and gradually reduces in diameter upwards; the outer periphery of the connecting head 2132 is provided with a plurality of third limiting convex parts 2132c which can elastically stretch and retract along the radial direction, and sliding holes 2132d which are movably penetrated in the connecting head 2132 are arranged at positions corresponding to the third limiting convex parts 2132 c. In the illustrated embodiment, the third limiting protrusion 2132c is a limiting post, the outer end of the limiting post is hemispherical, the inner end of the limiting post is connected with a trapezoid block 2132e, a connecting block 2132f is arranged on the hole wall of the through hole 2132a near the sliding hole 2132d, one end of the trapezoid block 2132e near the hole wall of the through hole 2132a is connected with the connecting block 2132f through a spring 2132g, and a limiting rod 2132h is arranged above the limiting post in the through hole 2132a; when the air is not ventilated, the pushing rod 2132b is placed on the two stop blocks 2131d, one side of the trapezoid block 2132e, which is close to the pushing rod 2132b, is propped against the pushing rod 2132b, and the hemispherical end of the limiting column is positioned in the sliding hole 2132d; after ventilation, the air source enters the air cavity 2131a, the air in the air cavity 2131a pushes the push rod 2132b to move upwards, the outer peripheral wall of the push rod 2132b extrudes the trapezoid block 2132e outwards, the trapezoid block 2132e drives the limit post to move outwards the connecting head 2132, the hemispherical end of the limit post extends outwards completely to the outer wall surface of the connecting head 2132, and at this time, the push rod 2132b cannot move upwards due to the blocking of the limit rod 2132 h.

Referring to fig. 10, the polishing disc 22 includes a detachable seat 221 detachably connected to the mounting seat 213, and a polishing disc body 222 disposed on the detachable seat 221 and away from one end of the mounting seat 213, wherein the polishing disc body 222 is adapted to a placement area on the limiting plate 151 of the polishing disc rotating device 1. The detachable seat 221 is adapted to the connecting head 2132, the detachable seat 221 has a collar capable of being looped around the outer periphery of the connecting head 2132, and a limit concave portion 2211 in limit fit with the position corresponding to the third limit convex portion 2132c on the inner peripheral wall of the collar is provided.

The working principle of the utility model is as follows: attaching sand paper for polishing to the surface of the polishing disc body 222 away from the detachable seat 221, mounting the detachable seat 221 and the connecting head 2132 together, ventilating an air cavity 2131a in the base 2131 through the first air inlet pipe joint 2131b at the moment, pushing the push rod 2132b to move upwards by air in the air cavity 2131a to push the peripheral wall of the push rod 2132b to extrude the trapezoid block 2132e outwards, driving the limit column to move outwards of the connecting head 2132 by the trapezoid block 2132e, and enabling the hemispherical end of the limit column to extend outwards to the outer wall surface of the connecting head 2132 completely and be in limit fit with a limit concave part 2211 on an inner sleeve ring of the detachable seat 221, so that the detachable seat 221 and the connecting head 2132 are connected; the driving structure 212 in the polishing machine body 21 drives the mounting seat 213 and the polishing disc 22 connected with the mounting seat 213 to vibrate and polish electronic products such as a notebook computer, and only the front half part of the sand paper is used, so that polishing is stopped at this time, after the air in the air cavity 2131a is discharged through the exhaust pipe, the push rod 2132b falls back onto the stop block 2131d, the extrusion of the push rod 2132b is lost, the restoring deformation gives an elasticity to the trapezoid block 2132e, the trapezoid block 2132e drives the limiting column to return to the original position, and the hemispherical end of the limiting column returns to the sliding hole 2132d of the connecting head 2132; at this time, the manipulator can take away the polishing disc 22 and place the polishing disc on the polishing disc rotating device 1, the polishing disc 22 is limited in a placing area on the limiting plate 151, the output end of the swinging cylinder enables the rotating table 112 to rotate 180 degrees, and the rotating table 112 drives the limiting plate 151 to rotate 180 degrees, so that the polishing disc 22 is rotated 180 degrees; after the rotation, the manipulator takes away the polishing disc 22 and places it on the mounting seat 213, so that the detachable seat 221 is connected with the connecting head 2132 again, and polishing is continued, and the specific principle can be seen from the above, and will not be described here again.

The polishing disc rotation device and the polishing system of the rotatable polishing disc have the following beneficial effects: the utilization rate of polishing consumables is improved and the cost is saved by rotating the polishing disc; the grinding disc is automatically rotated through the rotating device, so that labor is not needed, time is saved, production efficiency is improved, and potential safety hazards caused by manual operation are eliminated.

The foregoing examples only represent preferred embodiments of the present utility model, which are described in more detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. A grinding wheel rotation device, characterized in that: the grinding disc grinding device comprises a rotating mechanism, a rotating arm arranged on a rotating output end of the rotating mechanism, a first buffer and a second buffer arranged on the rotating mechanism, and a limiting part arranged on the rotating output end and used for horizontally limiting a grinding disc, wherein the first buffer and the second buffer are respectively propped against the rotating arm at 0 degree and 180 degrees.

2. The disc rotation apparatus of claim 1, wherein: the rotary mechanism is provided with a connecting arm distributed along the length direction of the connecting arm, the connecting arm is distributed outside one side of the rotary output end, the connecting arm is symmetrically arranged by taking the central axis along the width direction of the rotary mechanism as a symmetrical axis, and the first buffer and the second buffer are symmetrically arranged at two ends of the connecting arm.

3. The disc rotation device of claim 2, wherein: the rotation mechanism is defined as a swing cylinder having a cylindrical rotation table, and the rotation arm is formed to extend outwardly from an outer wall of the rotation table.

4. A disc rotation device as claimed in claim 3, wherein: the connecting arm is arranged on the shell of the swing cylinder along the length direction of the swing cylinder, a part, close to the rotating table, of the connecting arm, which is opposite to the rotating table, forms a concave cambered surface, a plurality of fixing lugs are formed by protruding outwards from one side of the connecting arm, and coaxial fixing holes are formed in the shell and the fixing lugs.

5. The disc rotation device of any one of claims 1 to 4, wherein: the limiting part comprises a limiting plate arranged on the rotary output end, a first limiting convex part arranged on the upper surface of the limiting plate and close to a long side, and a second limiting convex part arranged on the limiting plate and close to a short side, and a placing area for placing the polishing disc is formed in an area, located on the limiting plate, surrounded by the first limiting convex part and the second limiting convex part.

6. A polishing system of rotatable polishing disc, its characterized in that: comprising a grinding machine, a grinding disc rotation device according to any one of claims 1 to 5, a pick-and-place manipulator for picking and delivering a grinding disc to be rotated on the grinding machine to the grinding disc rotation device and for picking and delivering the grinding disc rotated by the grinding disc rotation device to the grinding machine.

7. A sanding system of a rotatable sanding disc as defined in claim 6 wherein: the polishing machine comprises a polishing machine body and a polishing disc detachably arranged on the polishing machine body, wherein the polishing machine body is provided with a mounting seat, and the polishing disc comprises a detachable seat detachably connected with the mounting seat and a polishing disc body arranged on the detachable seat and far away from one end of the mounting seat.

8. A sanding system of a rotatable sanding disc as defined in claim 7 wherein: the mounting seat comprises a base connected with the polisher body and a connector arranged at the upper end of the base, and a plurality of third limit protruding parts capable of elastically stretching along the radial direction are distributed on the periphery of the connector; the detachable seat is provided with a lantern ring which can be sleeved on the periphery of the connector, and a limiting concave part which is in limiting fit with the third limiting convex part is arranged on the inner peripheral wall of the lantern ring at a position corresponding to the third limiting convex part.

9. A sanding system of a rotatable sanding disc as defined in claim 8 wherein: the base is provided with a hollow air cavity, and the outer side wall of the base is provided with a first air inlet pipe joint and an air outlet pipe joint which are communicated with the air cavity; a through hole communicated with the air cavity is formed in the connecting head in the vertical direction, a push rod is movably arranged in the through hole, a sliding hole for the connecting head to movably penetrate through is formed in the connecting head at a position corresponding to the third limit convex part, the inner end of the sliding hole is communicated with the through hole, and the outer end of the sliding hole penetrates through the connecting head in the radial direction; the third limit convex part is limited to be a limit column in sliding fit with the sliding hole, the inner end of the limit column inwards protrudes into the through hole and is connected with the hole wall of the through hole through a spring, and the outer end of the limit column can outwards protrude from the outer wall surface of the connector; when the air source enters the air cavity, the push rod is pushed to move upwards to the position of the limit post, the peripheral wall of the push rod is outwards extruded to the limit post, and the outer end of the limit post is outwards extended out of the outer wall surface of the connector.

10. A sanding system of a rotatable sanding disc as defined in claim 9 wherein: the push rod is provided with a cylindrical section matched with the aperture of the through hole, and a conical section which is formed at the upper end of the cylindrical section and gradually reduces in diameter upwards.