CN211439295U - Polishing device - Google Patents

Abstract

The application relates to a grinding device belongs to building construction equipment technical field. The polishing device comprises a grinding disc shell, a polishing disc, an upper fixing plate and a polishing motor; the grinding motor is fixed on the upper fixed plate, the grinding disc is installed at the output end of the grinding motor, and the grinding disc shell is installed on the upper fixed plate in a floating mode and covers the outer portion of the grinding disc. According to the grinding device of this application embodiment, after the grinding disc wearing, because the floating cooperation of upper fixed plate and mill shell, the mill shell can self-adaptation polish the loss degree of dish, adjusts the height of mill shell, prevents that the grinding disc from idle rotating and dust when preventing to polish leaks.

Description

Polishing device

Technical Field

The application relates to the technical field of building construction equipment, in particular to a polishing device.

Background

There are a large amount of wall construction processes in the construction, like ceiling polish, interior wall polish, outer wall polish, putty polish etc. traditional operation mode needs the instrument such as workman manual operation angle mill to go on, not only wastes time and energy, and has all caused harm to environment and workman by the dust that polishes and cause etc.. Along with the promotion of mechanical intellectuality, the mode of robot operation is more and more applied to in the construction operation, but, in the wall process of polishing, the robot is polished although can accomplishing the wall, but makes mill and wall difficult to seal, leads to dust extraction also not good effect.

SUMMERY OF THE UTILITY MODEL

An object of this application is to provide a grinding device, can fine completion with the sealed of wall to prevent that the dust from leaking, also can adjust self height after the mill wearing and tearing, guarantee that mill and wall push up always and lean on, prevent the mill idle running.

According to one aspect of the application, the polishing device comprises a polishing disc shell, a polishing disc, an upper fixing plate and a polishing motor;

the grinding motor is fixed on the upper fixed plate, the grinding disc is installed at the output end of the grinding motor, and the grinding disc shell is installed on the upper fixed plate in a floating mode and covers the outer portion of the grinding disc.

According to the grinding device of this application embodiment, after the grinding disc wearing, because the floating cooperation of upper fixed plate and mill shell, the mill shell can self-adaptation polish the loss degree of dish, adjusts the height of mill shell, prevents that the grinding disc from idle rotating and dust when preventing to polish leaks.

In addition, the grinding device according to the embodiment of the application also has the following additional technical characteristics:

according to some embodiments of the application, a brush is mounted to an edge of the abrasive disc housing, the brush for abutting against a polished wall surface to form a seal between the abrasive disc housing and the polished wall surface.

In the above embodiment, the edge of the grinding disc shell is provided with the brush, when the grinding disc shell abuts against the wall surface, a seal is formed between the grinding disc shell and the grinding wall surface, dust is prevented from leaking during grinding, and a better dustproof effect is achieved.

In some embodiments of the present application, the brush is an annular strip brush.

In the above embodiment, compared with an implanted brush, the annular strip brush has higher density and lower hardness, is suitable for polishing application scenes, and has better sealing and dustproof (leakage) effects.

According to some embodiments of the application, the below of mill shell is connected with first guiding axle, and the one end of keeping away from the mill shell of first guiding axle passes the upper fixed plate and links to each other with lock nut, and the cover is equipped with first compression spring on the first guiding axle, and the both ends of first compression spring butt respectively in mill shell and upper fixed plate.

In the above embodiment, the floating fit between the grinding disc shell and the upper fixing plate is realized through the fit between the first guide column and the first compression spring, and the stable and flexible movement of the grinding disc shell is ensured.

According to some embodiments of the application, the grinding device further comprises a lower fixing plate, and the lower fixing plate is in floating connection with the upper fixing plate.

In the above embodiment, the upper fixing plate and the lower fixing plate are in floating fit, so that the polishing disc is floated to adapt to different wall surface working conditions.

In some embodiments of the present application, the polishing device further includes a middle fixing plate, a second guide shaft, and a second compression spring, the middle fixing plate is located between the upper fixing plate and the lower fixing plate, one end of the second guide shaft is connected to the upper fixing plate, the other end of the second guide shaft sequentially passes through the middle fixing plate and the lower fixing plate and is connected to the guide shaft fixing ring, a pressure sensor is disposed between the middle fixing plate and the lower fixing plate, the pressure sensor is mounted on the lower fixing plate, the second compression spring is sleeved on the second guide shaft, and two ends of the second compression spring respectively abut against the middle fixing plate and the upper fixing plate.

In above-mentioned embodiment, realize polishing dish and the unsteady of bottom plate through second guiding axle and second compression spring, well fixed plate and second guiding axle sliding fit, when the top plate removed towards the bottom plate, the top plate can extrude second compression spring and remove towards the bottom plate in order to drive well fixed plate to make well fixed plate extrusion pressure sensor, pressure sensor detects the pressure of well fixed plate, obtains the effort that the dish of polishing supported and leans on in the wall of polishing.

In some embodiments of the present application, a spring fixing ring is disposed on the second guide shaft, the spring fixing ring is lower than the lowest point of the polishing motor, and two ends of the second compression spring respectively abut against between the spring fixing ring and the middle fixing plate.

In the above embodiment, the spring fixing ring on the second guide shaft plays a role in limiting, and prevents the middle fixing plate from interfering with the grinding motor when the second compression spring is compressed.

In some embodiments of the present application, a universal ball sleeve is connected below the upper fixing plate, and the second guide shaft is connected to the upper fixing plate through the universal ball sleeve.

In the above embodiment, the connection between the upper fixing plate and the second guide shaft is realized through the universal ball sleeve, so that the second guide shaft and the upper fixing plate are flexibly connected.

In some embodiments of the present application, a guide shaft middle support is disposed on the middle fixing plate, and the second guide shaft penetrates through the guide shaft middle support.

In the above embodiment, the guide support of the second guide shaft is realized by the bearing in the guide shaft.

According to some embodiments of the application, the grinding device further comprises a motor waterproof cover, and the grinding motor is sleeved with the motor waterproof cover.

In the embodiment, the waterproof function of the grinding motor is improved due to the arrangement of the motor waterproof cover.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is a front view of a polishing apparatus provided in an embodiment of the present application;

FIG. 2 is an exploded isometric view of a sanding device as provided in an embodiment of the present application;

fig. 3 is a top view of a polishing apparatus provided in an embodiment of the present application;

FIG. 4 is an enlarged view taken at A of FIG. 1;

fig. 5 is a left side view of a polishing apparatus provided in an embodiment of the present application;

fig. 6 is an isometric view of a grinding device provided in an embodiment of the present application.

Icon: 100-a grinding device; 11-a millstone shell; 12-a sanding disc; 13-upper fixing plate; 14-grinding the motor; 15-a brush; 16-a dust suction pipe; 17-polishing the disc fixing block; 18-motor shaft cushion block; 19-a first guide shaft; 20-a first compression spring; 21-a lock nut; 22-motor waterproof cover; 23-a waterproof joint; 24-a dust outlet; 30-lower fixing plate; 31-middle fixing plate; 32-a second guide shaft; 33-a second compression spring; 34-a pressure sensor; 35-universal ball sleeve; 36-spring retainer ring; 37-guide shaft fixing ring; 38-guide shaft middle support; 39-sensor fixing seat.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when using, and are only used for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

An embodiment of a sanding device 100 in accordance with an aspect of the present application is described below with reference to the figures.

As shown in fig. 1, a grinding apparatus 100 according to an embodiment of the present application includes: the grinding disc comprises a grinding disc shell 11, a grinding disc 12, an upper fixing plate 13 and a grinding motor 14.

Specifically, as shown in fig. 2, the grinding disc shell 11 is a shell structure, and is used for covering the outside of the grinding disc 12 to protect and prevent dust from leaking; the grinding motor 14 is fixed on the upper fixing plate 13, and an output shaft of the grinding motor 14 penetrates through the upper fixing plate 13 and then is connected with the grinding disc 12; the grinding disc housing 11 is floatingly mounted to the upper fixing plate 13 and covers the outside of the grinding disc 12.

According to the grinding device 100 of the embodiment of the application, the grinding disc 12 is installed at the output end of the grinding motor 14, the grinding motor 14 is fixed on the upper fixing plate 13, due to the fact that the grinding disc shell 11 and the upper fixing plate 13 are in floating fit, after the grinding disc 12 is abraded, the grinding disc shell 11 can be self-adaptive to the loss degree of the grinding disc 12, the height of the grinding disc shell 11 is adjusted, the grinding disc 12 is prevented from idling, dust is prevented from leaking when grinding is conducted, and the influence of grinding dust on the environment and other workers is reduced.

The structural features and the connection of the respective components of the polishing apparatus 100 according to the embodiment of the present application will be described below with reference to the accompanying drawings.

As shown in fig. 2, the grinding disc housing 11 is a cover-shaped structure, and a shaft hole (not shown) is formed in the middle of the grinding disc housing 11 for the output shaft of the grinding motor 14 to pass through. As shown in fig. 3, a dust outlet 24 is formed on the grinding disc housing 11, and the dust outlet 24 is connected with a dust suction pipe 16 for connecting with a dust suction device.

The edge of the grinding disc shell 11 is provided with a brush 15, as shown in fig. 2, the brush 15 is an annular strip brush and is used for abutting against the grinding wall surface so as to form a seal between the grinding disc shell 11 and the grinding wall surface. Annular strip brush, for implanted brush 15, the density of strip brush is higher, hardness is lower, is fit for polishing application scene, and sealed effect (prevent the dust effect of leaking) is better.

As shown in fig. 4, the upper fixing plate 13 is located below the grinding disc housing 11, the grinding motor 14 is fixed on one side of the upper fixing plate 13 far away from the grinding disc housing 11, an output shaft of the grinding motor 14 penetrates through the upper fixing plate 13 and then extends into a shaft hole of the grinding disc housing 11 and is connected with the grinding disc 12, and the grinding motor 14 is movably matched with the grinding disc housing 11. The specific connection mode is that, the grinding disc 12 is connected to the output shaft of the grinding motor 14 through the grinding disc fixing block 17, the grinding disc 12 is in transmission fit with the output shaft of the grinding motor 14, and when the grinding motor 14 works, the output shaft of the grinding motor 14 can drive the grinding disc 12 to rotate relative to the grinding disc shell 11. The polishing disc 12 is connected with the polishing motor 14 through the polishing disc fixing block 17, so that the power transmission links are reduced, and the requirement on higher rotating speed can be met.

As shown in fig. 2, four first guide shafts 19 are disposed at the bottom of the grinding disc housing 11, the four first guide shafts 19 are distributed in a rectangular array, one end of each first guide shaft 19 is fixed (for example, welded, screwed, etc.) to the grinding disc housing 11, the other end of each first guide shaft 19 passes through the upper fixing plate 13 and then is connected to a lock nut 21, the first guide shafts 19 are slidably engaged with the upper fixing plate 13, and the lock nut 21 is used to prevent the first guide shafts 19 from being disengaged from the upper fixing plate 13. As shown in fig. 4, the first guide shaft 19 is sleeved with a first compression spring 20, and two ends of the first compression spring 20 respectively abut against the grinding disc housing 11 and the upper fixing plate 13, so as to realize the floating fit of the grinding disc housing 11 and the upper fixing plate 13. In other embodiments of the present application, the number of the first guiding shafts 19 may also be multiple, and different numbers of the first guiding shafts 19 are selected according to different use environments to ensure that the grinding disc housing 11 floats stably relative to the upper fixing plate 13.

In order to facilitate the floating of the grinding disc housing 11 relative to the upper fixing plate 13, a motor shaft cushion block 18 (shown in fig. 2) is sleeved on the output shaft of the grinding motor 14 to increase the distance between the grinding disc 12 and the upper fixing plate 13 and prevent the grinding disc 12 from interfering with the grinding disc housing 11.

Further, as shown in fig. 2, the outside cover of the grinding motor 14 is provided with a motor waterproof cover 22, the motor waterproof cover 22 is connected with a waterproof joint 23, and the arrangement of the motor waterproof cover 22 and the waterproof joint 23 improves the waterproof and dustproof performance of the grinding motor 14, prolongs the service life of the grinding motor 14, and is suitable for different working conditions.

The compression stroke of the first compression spring 20 is larger than the loss amount of the polishing disc 12 and the height of the brush 15, when the polishing disc 12 is worn, the first compression spring 20 adjusts the compression amount in a self-adaptive mode, so that the height of the brush 15 is always consistent with the height of the polishing disc 12, and the polishing disc 12 is prevented from idling.

Optionally, when using, the high customization of brush 15, highly higher than the dish 12 of polishing by 5mm, brush 15 with polish the wall top lean on the back, first compression spring 20 compresses until the 12 tops of the dish of polishing lean on the wall, first compression spring 20 tensile force guarantees that brush 15 can prevent the dust with the wall in close contact with of polishing always and reveal, guarantees that brush 15 and the wall of polishing contact earlier and guarantee sealed effect. In the continuous grinding process of the grinding disc 12, because the grinding disc 12 has a loss amount of 7mm (according to different grinding discs 12, the loss amount value is changed), the compression stroke of the first compression spring 20 is 13mm, and the first compression spring 20 automatically adjusts the compression amount along with the loss of the grinding disc 12, so that the height of the brush 15 is always consistent with the height of the grinding disc 12, and the grinding disc 12 is prevented from idling.

The floating process of the grinding disc shell 11 and the upper fixing plate 13 is as follows: when the grinding disc 12 abuts against the grinding wall surface, the grinding disc shell 11 abuts against the grinding wall surface, the first compression spring 20 between the grinding disc shell 11 and the upper fixing plate 13 is in a compression state, along with the loss of the grinding disc 12, the distance between the upper fixing plate 13 and the grinding wall surface is reduced, the upper fixing plate 13 extrudes the first compression spring 20, the compression amount of the first compression spring 20 is automatically adjusted, the distance between the grinding disc shell 11 and the upper fixing plate 13 is reduced, the grinding disc shell 11 always keeps highly consistent with the grinding disc 12 (abuts against the grinding wall surface together) under the elastic force of the first compression spring 20, and the grinding disc 12 is prevented from idling. During the polishing operation, the dust generated by the polishing disc 12 acting on the polishing wall surface is collected in the space enclosed by the disc shell 11 and the brush 15, and under the action of the dust suction device, the dust is sucked away through the dust suction pipe 16, so that the dust removal operation is realized, and the dust is prevented from leaking.

The polishing device 100 of the application further comprises a lower fixing plate 30, the lower fixing plate 30 is connected with the upper fixing plate 13 in a floating mode, the lower fixing plate 30 is used for being connected with other parts of polishing equipment (not marked in the drawing), the polishing head assembly is formed by the polishing disk 12, the polishing motor 14, the polishing disk shell 11 and the upper fixing plate 13, and the polishing head assembly is enabled to float due to the floating cooperation of the lower fixing plate 30 and the upper fixing plate 13.

As shown in fig. 5, the polishing device 100 further includes a middle fixing plate 31, a second guide shaft 32, a second compression spring 33, a pressure sensor 34, a universal ball sleeve 35, a spring fixing ring 36, a guide shaft fixing ring 37, and a guide shaft middle support 38, wherein the upper fixing plate 13, the middle fixing plate 31, and the lower fixing plate 30 are sequentially distributed in the vertical direction shown in fig. 5, and the polishing motor 14 is located between the upper fixing plate 13 and the middle fixing plate 31; as shown in fig. 6, the pressure sensor 34 is located between the middle fixing plate 31 and the lower fixing plate 30.

Four second guide shafts 32 are arranged, and the four second guide shafts 32 are distributed at four corners of the upper fixing plate 13; four universal ball sleeves 35 are arranged, and the four universal ball sleeves 35 correspond to the four second guide shafts 32 one by one; the universal ball sleeve 35 is arranged below the upper fixing plate 13, one end of the second guide shaft 32 is connected with the upper fixing plate 13 through the universal ball sleeve 35, and the other end of the second guide shaft 32 sequentially penetrates through the middle fixing plate 31 and the lower fixing plate 30 and is connected with the guide shaft fixing ring 37; the second guide shafts 32 are slidably engaged with the middle fixing plate 31 and the lower fixing plate 30, respectively, and the second guide shafts 32 can move relative to the middle fixing plate 31 and the lower fixing plate 30 following the upper fixing plate 13.

The universal ball sleeve 35 is arranged, so that the second guide shaft 32 and the upper fixing plate 13 can be flexibly connected. The guide shaft fixing ring 37 prevents the second guide shaft 32 from falling off from the lower fixing plate 30 during the grinding operation. In other embodiments of the present application, the number of the second guiding shafts 32 may also be multiple, and multiple second guiding shafts 32 are distributed around the geometric center of the upper fixing plate 13 to ensure that the upper fixing plate 13 floats smoothly relative to the lower fixing plate 30.

Taking a single second guide shaft 32 as an example, the second compression spring 33 is sleeved on the second guide shaft 32, the spring fixing ring 36 is disposed on the second guide shaft 32, as shown in fig. 5, the spring fixing ring 36 is lower than the lowest point of the grinding motor 14 along the vertical direction (the lowest point refers to the lowest point of the part of the grinding motor 14 located between the upper fixing plate 13 and the middle fixing plate 31), and two ends of the second compression spring 33 are respectively abutted between the spring fixing ring 36 and the middle fixing plate 31.

The spring fixing ring 36 is provided such that the middle fixing plate 31 moves toward the upper fixing plate 13 without interfering with the grinding motor 14 when the second compression spring 33 is compressed. It should be noted that the spring fixing ring 36 is locked to the second guide shaft 32 by bolts, and the height of the spring fixing ring 36 on the second guide shaft 32 can be adjusted to adjust the compression amount of the second compression spring 33 according to the use requirement.

The pressure sensor 34 is mounted on the sensor fixing base 39 of the lower fixing plate 30, the pressure sensor 34 is electrically connected with an external control device (not shown), and the pressure sensor 34 can output a pressure signal when the middle fixing plate 31 presses the pressure sensor 34.

Further, a middle guide shaft support 38 is mounted on the middle fixing plate 31, the second guide shaft 32 is arranged in the middle guide shaft support 38 in a penetrating manner, and the middle guide shaft support 38 provides guiding support for the second guide shaft 32. As shown, the guide shaft center support 38 is located above and below the center fixing plate 31, and supports the second guide shaft 32. In other embodiments of the present application, the middle support 38 of the guide shaft may also be located on one side (e.g., only above or only below) of the middle fixing plate 31.

The working principle of the pressure sensor 34 is: when the polishing disc 12 is driven to abut against the polishing wall surface, acting force is applied to the polishing disc 12, the lower fixing plate 30 moves towards the upper fixing plate 13, the middle fixing plate 31 presses the pressure sensor 34 (the middle fixing plate 31 presses the second compression spring 33, and the second compression spring 33 applies elastic force to the middle fixing plate 31), the pressure sensor 34 detects the pressure of the middle fixing plate 31 and outputs a pressure signal, and an external control device executes corresponding control operation according to the pressure signal.

Set up well fixed plate 31 between upper fixed plate 13 and the bottom plate 30, through well fixed plate 31 and pressure sensor 34's cooperation, detect the effort that grinds dish 12 and act on the wall of polishing to cooperate with external control equipment, adapt to the different wall operating modes of polishing.

The working principle of the grinding device 100 according to the embodiment of the application is as follows:

during the operation of polishing, after polishing dish 12 leaned on the wall of polishing, along with polishing dish 12 acts on the effort increase of the wall of polishing, move towards upper fixed plate 13 in the lower fixed concave part, pressure sensor 34 and well fixed plate 31 contact, well fixed plate 31 extrudees pressure sensor 34 under the effect of second compression spring 33, and pressure sensor 34 feels certain pressure numerical value (can understand and predetermine the pressure value), and the completion is polished dish 12 and is leaned on, begins the work of polishing. Because upper fixed plate 13 and the cooperation of lower fixed plate 30 floating for the polishing dish 12 of the head subassembly of polishing can laminate with the wall all the time, be adapted to the wall operating mode of polishing of difference. In the continuous grinding work of the grinding disc 12, along with the loss of the grinding disc 12, the first compression spring 20 adjusts the compression amount, the distance between the grinding disc shell 11 and the upper fixing plate 13 is reduced, the height of the brush 15 on the grinding disc shell 11 is always consistent with the height of the grinding disc 12, and the grinding disc 12 is prevented from idling.

According to the grinding device 100 of this application, through the floating cooperation of two-stage for brush 15 on grinding disc 12 and the grinding disc shell 11 keeps the same height, prevents to grind the idle rotation of disc 12, and simultaneously, brush 15 and the wall of polishing between form sealed, solved the problem that the dust that produces of polishing reveals, reduced the influence to environment and other workman's production.

It should be noted that the features of the embodiments in the present application may be combined with each other without conflict.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A polishing device is characterized by comprising a grinding disc shell, a polishing disc, an upper fixing plate and a polishing motor;

the grinding motor is fixed on the upper fixing plate, the grinding disc is installed at the output end of the grinding motor, and the grinding disc shell is installed on the upper fixing plate in a floating mode and covers the outer portion of the grinding disc.

2. An abrading device according to claim 1, wherein the edge of the abrasive disc housing is fitted with a brush for abutment with an abrading wall surface to form a seal between the abrasive disc housing and the abrading wall surface.

3. An abrading device as defined in claim 2, wherein the brush is an annular strip brush.

4. The grinding device as claimed in claim 1, wherein a first guide shaft is connected to the lower portion of the grinding disc shell, one end of the first guide shaft, which is far away from the grinding disc shell, penetrates through the upper fixing plate and is connected with a locking nut, a first compression spring is sleeved on the first guide shaft, and two ends of the first compression spring are abutted to the grinding disc shell and the upper fixing plate respectively.

5. The polishing apparatus as set forth in claim 1 further comprising a lower retaining plate, said lower retaining plate being floatingly connected to said upper retaining plate.

6. The polishing device as claimed in claim 5, further comprising a middle fixing plate, a second guide shaft, and a second compression spring, wherein the middle fixing plate is located between the upper fixing plate and the lower fixing plate, one end of the second guide shaft is connected to the upper fixing plate, the other end of the second guide shaft sequentially passes through the middle fixing plate and the lower fixing plate and is connected to the guide shaft fixing ring, a pressure sensor is disposed between the middle fixing plate and the lower fixing plate, the pressure sensor is mounted on the lower fixing plate, the second compression spring is sleeved on the second guide shaft, and two ends of the second compression spring are respectively abutted between the upper fixing plate and the middle fixing plate.

7. The polishing device as claimed in claim 6, wherein a spring fixing ring is disposed on the second guide shaft, the spring fixing ring is lower than the lowest point of the polishing motor, and two ends of the second compression spring respectively abut against between the spring fixing ring and the middle fixing plate.

8. The polishing apparatus as claimed in claim 6, wherein a universal ball sleeve is connected to a lower portion of the upper fixing plate, and the second guide shaft is connected to the upper fixing plate through the universal ball sleeve.

9. The polishing device as recited in claim 6, wherein a guide shaft middle support is disposed on the middle fixing plate, and the second guide shaft is disposed through the guide shaft middle support.

10. The sanding device of claim 1, further comprising a motor waterproof cover that is sleeved outside the sanding motor.

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