CN216859291U - Sanding system - Google Patents

Abstract

The utility model discloses a sanding system, which relates to the technical field of mechanical polishing and comprises n + m stations which are uniformly distributed, n sanding machine units which are distributed in a surrounding manner, n + m conveying units which are distributed in a surrounding manner and a rotating unit which is used for driving all the conveying units to rotate simultaneously, wherein the sanding machine units are used for polishing a circular pipe, the sanding precision of abrasive belts of all the sanding machine units is from low to high along the clockwise direction, the n sanding machine units are in one-to-one correspondence with the n stations, the conveying units are used for driving the circular pipe to move relative to the sanding machine units, the n + m conveying units are in one-to-one correspondence with the n + m stations, n is a positive integer which is more than or equal to 2, m is a positive integer which is more than or equal to 1, and n is more than m. So set up, n grinder units simultaneous working, accomplish whole polishing after the pipe rotates a week and handle the manufacturing procedure, have improved the efficiency of the whole manufacturing procedure of the pipe of high polishing precision.

Description

Sanding system

Technical Field

The utility model relates to the technical field of mechanical polishing, in particular to a sanding system.

Background

The circular tube with a circular cross section has a surface polishing process in the production process, and is generally carried out by using a sander. Generally speaking, a sander includes a conveying mechanism and a polishing mechanism, the polishing mechanism includes a sanding turntable and two sanding belts connected to a surface of the sanding turntable, the sanding belts are generally disposed at an interval, the two sanding belts are driven by the belt wheels to rotate at a high speed, the sanding turntable also rotates, when a circular pipe passes through the conveying mechanism from between the two sanding belts, the two sanding belts can perform a full-polishing process on an outer surface of the circular pipe.

In many cases, a round tube needs to be ground by an abrasive belt for many times in a polishing process, and particularly for some round tube products with high requirements on polishing degree, in the prior art, the round tube needs to be polished by different sanding machines with grinding accuracy from low to high, and correspondingly, the round tube needs to be ground by one of the sanding machines with one accuracy and then transferred to a sanding machine with the next-stage accuracy for grinding. The applicant believes that how to improve the efficiency of the whole processing flow of a round tube with high polishing precision based on the requirement of the processing operation becomes an important technical problem to be solved by the technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a sanding system which improves the efficiency of the whole processing flow of a round pipe with high polishing precision compared with a sanding machine in the prior art. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the utility model are described in detail in the following.

In order to achieve the purpose, the utility model provides the following technical scheme:

the utility model provides a sanding system, which comprises:

n + m evenly distributed stations;

the sanding machine units are distributed in a surrounding mode and used for polishing the circular tube, the sanding belt grinding precision of all the sanding machine units is from low to high in the clockwise direction, and the n sanding machine units correspond to the n stations one by one;

the n + m conveying units are distributed in a surrounding mode and used for driving the circular tube to move relative to the sander unit, and the n + m conveying units correspond to the n + m stations one by one;

the rotating unit is used for driving all the conveying units to rotate simultaneously; wherein n is a positive integer greater than or equal to 2, m is a positive integer greater than or equal to 1, and n is greater than m.

Preferably, the device further comprises a tensioning tool jig arranged on the conveying unit, and the tensioning tool jig is used for clamping and loosening the circular tube.

Preferably, the tensioning tool jig comprises an upper sleeve fixed on the conveying unit relatively, a lower sleeve connected with the upper sleeve, a pressure rod positioned in the upper sleeve and the lower sleeve in a penetrating manner, and a driving cylinder connected with the upper end of the pressure rod and driving the pressure rod to move in a reciprocating manner along the length direction, the lower sleeve is provided with a structure matched with the shape of the elbow bend pipe so as to enable the elbow pipe to be sleeved on the lower sleeve, and the lower end of the pressure rod is provided with a pipe supporting body capable of supporting on the inner wall of the elbow pipe.

Preferably, the surface of the pipe propping body, which is in contact with the straight elbow circular pipe, is an arc surface, and the arc surface is matched with the shape of the inner wall of the straight elbow circular pipe.

Preferably, the tensioning tool jig further comprises a tool base fixed relative to the conveying unit, a lever hinged to the tool base in the middle, the driving cylinder and the upper sleeve are installed on the tool base, the pressing rod and the piston rod of the driving cylinder are arranged in parallel, and two ends of the lever are hinged to the upper end of the pressing rod and the upper end of the piston rod of the driving cylinder respectively.

Preferably, tensioning frock tool includes the relatively fixed cover on the conveying unit, with the inflation cover that the lower extreme of fixed cover is connected, be located fixed cover with rise pole in the inflation cover, with the upper end of rise pole is connected and is driven rise pole along length direction reciprocating motion' S actuating cylinder, the actuating cylinder is installed on the conveying unit, the hypomere of inflation cover includes a plurality of lamella components of a whole that can function independently, all the components of a whole that can function independently use the axle of inflation cover is the center pin and encircles the distribution, and S type curved circular tube can overlap on the inflation cover, the rise pole to during the hypomere extrusion of inflation cover, each lamella the components of a whole that can function independently keep away from each other, so that the hypomere of inflation cover opens and supports tightly on the inner wall of S type curved circular tube.

Preferably, a dust collection cover is arranged around the sander unit, and an air inlet and an air outlet which are used for being connected with an external air blowing and dust collecting system are arranged on the dust collection cover.

Preferably, the rotary unit includes fixed frame, is located on the fixed frame and can pivoted rotating platform, drive the motor drive structure of rotating platform rotation, all conveying unit all installs rotating platform is last.

Preferably, m is equal to 1.

Preferably, the rotary unit is located at the inner side of the ring-shaped structure formed by the n sanding machine units, and the tensioning tool jig is located above the sanding machine units.

In the technical scheme provided by the utility model, the sanding system comprises n + m stations which are uniformly distributed, n sanding machine units which are distributed in a surrounding manner, n + m conveying units which are distributed in a surrounding manner, and a rotating unit which is used for driving all the conveying units to rotate simultaneously, wherein the sanding machine units are used for polishing a circular tube, the sanding precision of abrasive belts of all the sanding machine units is from low to high along the clockwise direction, the n sanding machine units are in one-to-one correspondence with the n stations, the conveying units are used for driving the circular tube to move relative to the sanding machine units, the n + m conveying units are in one-to-one correspondence with the n + m stations, n is a positive integer which is greater than or equal to 2, m is a positive integer which is greater than or equal to 1, and n is greater than m. So set up, the conveying unit department of all stations all has the pipe, wherein m station gets as getting of pipe and puts the station, all the other n station departments, each conveying unit drives the pipe and obtains polishing treatment in the grinder unit department that corresponds, then, the rotating unit rotates, all conveying units rotate a station simultaneously, all conveying units move simultaneously and drive each pipe and move for the grinder unit after that, thereby make the pipe obtain further polishing treatment in the grinder unit department of next precision, so, n grinder unit simultaneous working, accomplish whole polishing treatment process flow after the pipe rotates a week, the efficiency of the whole process flow of the pipe of high polishing precision has been improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic axial view of a sanding system according to an embodiment of the present disclosure;

fig. 2 is a schematic top view of a sanding system according to an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of a rotary unit according to an embodiment of the present invention;

fig. 4 is a schematic positional relationship diagram of a first embodiment of a tensioning tool fixture and a conveying unit according to an embodiment of the utility model;

fig. 5 is an exploded view of a first embodiment of a tensioning tool fixture according to an embodiment of the present invention;

fig. 6 is a schematic partial sectional structural view of a first embodiment of a tensioning tool fixture according to an embodiment of the utility model;

fig. 7 is a schematic positional relationship diagram of a second embodiment of the tensioning tool fixture and the conveying unit in the embodiment of the utility model;

fig. 8 is an exploded view of a second embodiment of a tensioning tool fixture according to an embodiment of the present invention;

fig. 9 is a schematic partial sectional structural view of a second embodiment of a tensioning tool fixture according to an embodiment of the utility model.

In fig. 1-9:

1. a sander unit; 2. a conveying unit; 3. a rotation unit; 4. tensioning a tooling fixture; 5. a dust collection cover; 6. an air inlet; 7. an air outlet; 8. a machine base frame; 9. a right-angle elbow circular pipe; 10. s-shaped bent round pipes; 21. a cantilever; 31. a fixing frame; 32. rotating the platform; 33. a motor transmission structure; 34. a support frame; 35. a roller; 401. sleeving; 402. sleeving; 403. a pressure lever; 404. a driving cylinder; 405. a pipe abutting body; 406. a tool base; 407. a lever; 408. fixing a sleeve; 409. an expansion sleeve; 410. an expansion rod; 411. the components are separated.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the utility model, and not restrictive of the full scope of the utility model. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the utility model. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.

An object of the present embodiment is to provide a sanding system capable of improving the efficiency of the entire process flow of a round tube with high polishing precision in the related art.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. The embodiments described below are not intended to limit the scope of the present invention described in the claims. Further, the entire contents of the configurations shown in the following embodiments are not limited to those necessary as a solution of the utility model described in the claims.

Referring to fig. 1 to 9, the sanding system provided in this embodiment includes n + m stations uniformly distributed, n sanding machine units 1 distributed in a surrounding manner, n + m conveying units 2 distributed in a surrounding manner, and a rotating unit 3 for driving all the conveying units 2 to rotate simultaneously, where the sanding machine unit 1 is configured to polish a circular pipe, the sanding precision of the sanding belt of all the sanding machine units 1 is from low to high along an hour hand direction, the hour hand direction indicates clockwise or counterclockwise, the n sanding machine units 1 correspond to the n stations one-to-one, the conveying unit 2 is configured to drive the circular pipe to move relative to the sanding machine unit 1, and the n + m conveying units 2 correspond to the n + m stations one-to-one, where n is a positive integer greater than or equal to 2, m is a positive integer greater than or equal to 1, and n is greater than m. So set up, 2 departments of conveying unit of all stations all have the pipe, wherein the station is got as getting of pipe to m stations, all the other n stations departments, each conveying unit 2 drives the pipe and obtains polishing treatment in 1 departments of grinder unit that correspond, concretely, conveying unit 2 drives the motion that the pipe reciprocated, get into promptly and leave grinder unit 1, then, rotary unit 3 rotates, all conveying unit 2 rotate a station simultaneously, all conveying unit 2 move simultaneously and drive each pipe and reciprocate after that, thereby make the pipe obtain further polishing treatment in 1 departments of grinder unit of next precision, so, 1 simultaneous workings of n grinder unit, the pipe rotates and accomplishes whole polishing treatment process flow behind a week, the efficiency of the whole process flow of the pipe of high polishing precision has been improved.

It should be noted that, the specific structure of the conveying unit 2 is within the protection scope of the present invention as long as it can achieve the effect of driving the circular tube to move up and down. As an optional embodiment, the conveying unit 2 is configured to include a vertically arranged column and a horizontally arranged cantilever 21, the cantilever 21 can move up and down along the column through a ball screw driven by a motor, and the cantilever 21 is provided with a fixture, a jig, a manipulator, or other structures capable of fixing a circular tube. The synchronous displacement of the cantilevers 21 of the individual conveyor units 2 is controlled by a controller which is connected in communication with the individual motors.

As a preferred embodiment, the sanding system further comprises a tensioning tool fixture 4 arranged on the cantilever 21 of the conveying unit 2, wherein the tensioning tool fixture 4 is used for clamping and loosening the circular tube to prevent the circular tube from shaking under the driving of the sanding belt, and the position of the circular tube is fixed, so that uniform polishing is ensured.

Moreover, because of the different specifications of the round tube, when the round tubes of different specifications are polished and processed, the position of the tensioning tool fixture 4 relative to the cantilever 21 of the conveying unit 2 needs to be adjusted, so that the cantilever 21 can reach a proper position in the sander unit 1 when driving the round tube to move downwards. In order to conveniently adjust the position of the tensioning tool jig 4, the position can be selectively set, a ball screw and a motor for driving the ball screw to operate are arranged on the cantilever 21, the tensioning tool jig 4 is arranged on a nut of the ball screw, and the position of the tensioning tool jig 4 relative to the cantilever 21 is controlled by controlling the start and stop of the motor.

In a more specific embodiment, the rotating unit 3 includes a hollow cylindrical fixed frame 31, a rotating platform 32 located on the fixed frame 31 and capable of rotating, and a motor transmission structure 33 for driving the rotating platform 32 to rotate, all the conveying units 2 are mounted on the rotating platform 32, specifically, the upright posts of each conveying unit 2 are fixedly connected to the rotating platform 32, and the motor transmission structure 33 is located in the fixed frame 31. In order to make the rotation of the rotating platform 32 smoother, the edge of the rotating platform 32 has a lower edge integrally covered on the top end of the fixed frame 31, a support frame 34 is fixedly connected to the bottom surface of the rotating platform 32, the output shaft of the motor transmission structure 33 is connected to the central portion of the support frame 34, a plurality of movably connected rollers 35 are arranged in the fixed frame 31, the edge of the bottom surface of the support frame 34 is in contact connection with the wheel surfaces of the rollers 35, and when the rotating platform 32 rotates, the rollers 35 play a role in balance support. The motor drive structure 33 is in communication with the controller. It should be noted that, the motor transmission structure 33 only needs to be capable of outputting torque and driving the rotating platform 32 to rotate, and based on some conventional implementations in the art, the motor transmission structure 33 is specifically configured as an integrated structure device of a motor matching with a belt pulley transmission structure and a speed reducer, which is a common technical means in the prior art, and therefore is not described herein again.

In order to make whole sand light system structure more compact, usage space occupies rationally, and the workshop workman of being convenient for patrols and examines operating mode, overhauls and maintains, preferably sets up rotary unit 3 and is located the inboard of the cyclic annular structure that n grinder unit 1 formed, and the stand is located the inboard of the cyclic annular structure that n grinder unit 1 formed promptly, and cantilever 21 and tensioning frock tool 4 are located the top of grinder unit 1.

As an optional first implementation manner, because the process requirement of polishing the right-angled elbow circular tube 9 is often met during the production and processing process, in order to better fix the position of the right-angled elbow circular tube 9, the tensioning tooling fixture 4 is specifically configured to include an upper sleeve 401 relatively fixed on the conveying unit 2, a lower sleeve 402 detachably connected to the upper sleeve 401, a pressure rod 403 penetratingly located in the upper sleeve 401 and the lower sleeve 402, and a driving cylinder 404 connected to the upper end of the pressure rod 403 and driving the pressure rod 403 to reciprocate along the length direction, the upper section of the lower sleeve 402 is inserted into the upper sleeve 401 and is connected to the upper sleeve by a fastener, the lower section of the lower sleeve 402 has a structure matching the shape of the right-angled elbow circular tube 9, so that the right-angled elbow circular tube 9 is sleeved on the lower sleeve 402 from the end portion thereof, the lower end of the pressure rod 403 is provided with a tube supporting body 405 capable of supporting the inner wall of the right-angled elbow circular tube 9, that is when the pressure rod 403 moves downward, the pipe stopper 405 presses the elbow pipe 9 to prevent displacement. The drive cylinder 404 is specifically provided as a cylinder having a piston rod that can be extended and retracted. The controller is in communication with the air cylinder so as to control the operation of the overall sanding system.

Further, it is preferable that the surface of the pipe stopper 405 contacting the elbow pipe 9 is an arc surface, and the arc surface is matched with the inner wall of the elbow pipe 9, so as to achieve better effect of tightening and fixing the elbow pipe 9.

As a preferred embodiment, the tensioning tooling fixture 4 further includes a tool base 406 fixed opposite to the conveying unit 2, and a lever 407 having a middle portion hinged to the tool base 406, the tool base 406 is fixedly connected to the cantilever 21 of the conveying unit 2, the driving cylinder 404 and the upper sleeve 401 are both mounted on the tool base 406, the pressing rod 403 is parallel to a piston rod of the driving cylinder 404, and two ends of the lever 407 are respectively hinged to an upper end of the pressing rod 403 and an upper end of the piston rod of the driving cylinder 404. So set up, when the piston rod of cylinder extended, depression bar 403 pushed down the order and supported body 405 tightly to support on the inner wall of quarter bend pipe 9, when the piston rod of cylinder shortened, depression bar 403 was carried and is carried, supported body 405 and kept away from quarter bend pipe 9 to the convenience is taken off quarter bend pipe 9, wholly has compact structure, the advantage of the dismouting maintenance of being convenient for.

As an optional second embodiment, since the process requirement of polishing the S-shaped curved circular tube 10 is often met during the production process, in order to better fix the position of the S-shaped curved circular tube 10, the tensioning tooling fixture 4 may specifically include a fixed sleeve 408 relatively fixed on the conveying unit 2, an expansion sleeve 409 detachably connected to the lower end of the fixed sleeve 408, an expansion rod 410 located in the fixed sleeve 408 and the expansion sleeve 409, and a driving cylinder 404 connected to the upper end of the expansion rod 410 and driving the expansion rod 410 to reciprocate along the length direction, the driving cylinder 404 is installed on the cantilever 21 of the conveying unit 2, the driving cylinder 404 is specifically configured as an air cylinder having a telescopic piston rod, the upper end of the expansion sleeve 409 is inserted into the fixed sleeve 408 and is installed and connected by a fastener, the lower section of the expansion sleeve 409 includes a plurality of split bodies 411, all the split bodies 411 are distributed around the axis of the expansion sleeve 409, the S-shaped curved circular tube 10 is sleeved on the expansion sleeve 409, the piston rod of the cylinder extends to drive the expansion rod 410 to extrude towards the lower section of the expansion sleeve 409, the split parts 411 are away from each other to open the lower section of the expansion sleeve 409 and abut against the inner wall of the S-shaped curved circular tube 10, the piston rod of the cylinder is shortened to drive the expansion rod 410 to be away from the lower section of the expansion sleeve 409, and the split parts 411 are reset to enable the S-shaped curved circular tube 10 to be smoothly separated. The controller is in communication with the air cylinder so as to control the operation of the overall sanding system.

In addition, in order to optimize the environment of a processing workshop and prevent flying chips from scattering into the air in the polishing process, in a more preferable embodiment, a dust collection cover 5 for surrounding is arranged around the sander unit 1, an air inlet 6 and an air outlet 7 for connecting with an external air blowing and dust collecting system are arranged on the dust collection cover 5, the external air blowing and dust collecting system blows air into the dust collection cover 5 through the air inlet 6, and the air containing the flying chips is collected and conveyed out through the air outlet 7, so that the processing is convenient. In order to conveniently overhaul the sander unit 1, an access door capable of being opened and closed is further arranged on the dust collection cover 5.

Furthermore, more specifically, m is preferably equal to 1, n is preferably equal to 6, so that seven stations are operated simultaneously, the station without the sander unit 1 is used for taking unpolished round tubes and placing polished round tubes, and the sander units 1 in the remaining six stations perform processing of gradually polishing round tubes with high precision.

The sander unit 1 and the rotary unit 3 are both mounted on a machine underframe 8.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar contents in other embodiments may be referred to for the contents which are not described in detail in some embodiments. The multiple schemes provided by the utility model comprise basic schemes, are independent from each other and are not restricted with each other, but can be combined with each other under the condition of no conflict, so that multiple effects are realized together.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A sanding system, comprising:

n + m evenly distributed stations;

the sanding machine comprises n sanding machine units (1) distributed in a surrounding mode, wherein the sanding machine units (1) are used for polishing round pipes, the sanding precision of sanding belts of all the sanding machine units (1) is from low to high in the clockwise direction, and the n sanding machine units (1) correspond to the n stations one by one;

the n + m conveying units (2) are distributed in a surrounding mode, the conveying units (2) are used for driving the round tube to move relative to the sander unit (1), and the n + m conveying units (2) correspond to the n + m stations one by one;

a rotating unit (3) for driving all the conveying units (2) to rotate simultaneously; wherein n is a positive integer greater than or equal to 2, m is a positive integer greater than or equal to 1, and n is greater than m.

2. The sanding system according to claim 1, further comprising a tensioning tooling fixture (4) arranged on the conveying unit (2), the tensioning tooling fixture (4) being used for clamping and releasing a round tube.

3. The sanding system according to claim 2, wherein the tensioning tool fixture (4) comprises an upper sleeve (401) relatively fixed on the conveying unit (2), a lower sleeve (402) connected with the upper sleeve (401), a pressing rod (403) penetratingly positioned in the upper sleeve (401) and the lower sleeve (402), and a driving cylinder (404) connected with the upper end of the pressing rod (403) and driving the pressing rod (403) to reciprocate along the length direction, wherein the lower sleeve (402) has a structure matched with the shape of the elbow bend circular tube (9) so that the elbow bend circular tube (9) is sleeved on the lower sleeve (402), and a pipe abutting body (405) capable of abutting against the inner wall of the elbow bend circular tube (9) is arranged at the lower end of the pressing rod (403).

4. The sanding system according to claim 3, characterized in that the surface of the tubular abutment body (405) in contact with the circular quarter bend tube (9) is a curved surface conforming to the shape of the inner wall of the circular quarter bend tube (9).

5. The sanding system of claim 3, wherein the tensioning tooling fixture (4) further comprises a tool base (406) fixed relative to the conveying unit (2), and a lever (407) hinged to the tool base (406) at the middle part, the driving cylinder (404) and the upper sleeve (401) are both mounted on the tool base (406), the pressing rod (403) and a piston rod of the driving cylinder (404) are arranged in parallel, and two ends of the lever (407) are hinged to the upper end of the pressing rod (403) and the upper end of the piston rod of the driving cylinder (404), respectively.

6. The sanding system according to claim 2, wherein the tensioning tool fixture (4) comprises a fixed sleeve (408) relatively fixed on the conveying unit (2), an expansion sleeve (409) connected with the lower end of the fixed sleeve (408), an expansion rod (410) positioned in the fixed sleeve (408) and the expansion sleeve (409), and a driving cylinder (404) connected with the upper end of the expansion rod (410) and driving the expansion rod (410) to reciprocate along the length direction, the driving cylinder (404) is installed on the conveying unit (2), the lower section of the expansion sleeve (409) comprises a plurality of split petals (411), all the split parts (411) are distributed in a surrounding manner by taking the shaft of the expansion sleeve (409) as a central axis, an S-shaped bent round pipe (10) can be sleeved on the expansion sleeve (409), and when the expansion rod (410) extrudes towards the lower section of the expansion sleeve (409), the split bodies (411) are far away from each other, so that the lower section of the expansion sleeve (409) is expanded and is abutted against the inner wall of the S-shaped bent circular tube (10).

7. A sanding system according to claim 1, characterized in that a dust cage (5) is provided around the sanding unit (1), and that an air inlet (6) and an air outlet (7) for connection with an external air-blast dust-collecting system are provided on the dust cage (5).

8. The sanding system according to claim 1, characterized in that the rotary unit (3) comprises a fixed frame (31), a rotary platform (32) rotatable on the fixed frame (31), a motor transmission structure (33) driving the rotary platform (32) to rotate, all the delivery units (2) being mounted on the rotary platform (32).

9. The sanding system of claim 1, wherein m is equal to 1.

10. The sanding system according to claim 2, characterized in that the rotary unit (3) is located inside the ring-like structure formed by the n sander units (1), and the tensioning tooling fixture (4) is located above the sander units (1).

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