Handheld grinding device

Abstract

The utility model discloses a handheld grinding device, which belongs to the technical field of grinding devices and comprises a base plate, a sucker is fixedly arranged on the left side of the base plate, a motor is fixedly arranged on the right side of the base plate, an output shaft of the motor penetrates through the base plate leftwards and is fixedly provided with a polishing and grinding assembly, the polishing and grinding assembly is located in the sucker, and a dust suction pipe is arranged on the base plate. One end of the dust suction pipe communicates with each suction hole in the suction cup, the other end of the dust suction pipe communicates with the dust suction device through a hose, and a shell is fixedly arranged on the right side face of the base plate. By arranging the shell and the filter screen piece, in the using process of the device, the motor rotates to drive the polishing and grinding assembly to rotate to polish the wall face, heat generated by the motor is discharged through the heat dissipation holes in the shell, and the situation that the operating state of the motor is affected due to the fact that the working temperature of the motor is too high is prevented; the filter screen piece has the effect of preventing dust from entering the space on the left side of the filter screen piece, and then harmful effects of the dust on the motor are prevented.

Description

Technical Field

[0001] This utility model relates to a polishing device, and more particularly to a handheld polishing device. Background Technology

[0002] Wall grinders, also known as "wall sanders," are now available in two types: dust-generating and dust-free. While dust-generating sanders are more efficient and slightly cheaper, they still don't eliminate the problem of dust. Dust-free sanders, on the other hand, not only solve the problem of slow sanding speed but also eliminate the generation of dust.

[0003] Wall grinders designed for dust-free sanding typically include suction cups and polishing components. The suction cups adhere to the wall, while the motor drives the polishing components to grind the wall. The resulting debris and dust are sucked away by the suction cups, preventing dust from spreading and achieving a dust-free working environment. However, in actual use, dust is unavoidable in the on-site construction environment. The motor itself usually has heat dissipation windows, through which dust can easily enter the motor, reducing its internal insulation and affecting its lifespan. At the same time, dust covering the motor surface also reduces the heat dissipation capacity of the motor casing, similarly shortening the motor's lifespan. Utility Model Content

[0004] The purpose of this invention is to provide a handheld grinding device that has the advantage of preventing dust from contaminating the motor at the construction site, and effectively solves the problem of reduced service life of the motor of the existing handheld grinding device due to dust contamination.

[0005] The present invention adopts the following technical solution: a handheld polishing device, including a base plate, a suction cup fixedly disposed on the left side of the base plate, a motor fixedly disposed on the right side of the base plate, the output axis of the motor penetrating the base plate to the left and a polishing component fixedly disposed thereon, the polishing component being located inside the suction cup, a dust suction pipe disposed on the base plate, one end of the dust suction pipe communicating with each suction hole on the suction cup, the other end of the dust suction pipe communicating with a dust suction device through a flexible hose, a housing fixedly disposed on the right side of the base plate, the motor being located inside the housing, several heat dissipation holes being opened on the right end face of the housing, and a filter screen being disposed inside the housing to the right of the motor.

[0006] Furthermore, a cooling fan is coaxially fixed on the output shaft of the motor located between the motor and the base plate, and several exhaust holes are opened on the circumferential surface of the housing, with the exhaust holes located between the cooling fan and the base plate.

[0007] Furthermore, the housing includes a left housing and a right housing, with the filter screen fixedly disposed inside the right housing and the motor located inside the left housing; the left end of the right housing is snapped into the right end of the left housing.

[0008] Furthermore, a fixing ring is fixedly provided on the circumferential surface of the filter screen, and a number of limiting blocks are evenly fixedly provided on the outer surface of the fixing ring along the left and right directions. A number of sliding grooves corresponding to the limiting blocks are opened on the left end of the inner sidewall of the right shell along the left and right directions, and each limiting block is located in the corresponding sliding groove.

[0009] Furthermore, the circumferential surface of the right housing is provided with several through holes corresponding to the sliding groove in the radial direction, and a fastening bolt is inserted in each through hole. The outer side of each limiting block of the fixing ring is provided with a threaded hole in the radial direction, and each fastening bolt is threadedly connected to the corresponding threaded hole to realize the fixed connection between the fixing ring and the right housing.

[0010] Furthermore, each limiting block has a screw hole on its left end face that matches the fastening bolt along the axial direction, and the screw hole penetrates through the left and right end faces of the limiting block.

[0011] Furthermore, the left end face of the right shell is coaxially fixed with an annular protrusion, and a number of locking blocks are uniformly fixed on the inner side wall of the annular protrusion. The right end face of the left shell is coaxially provided with an annular groove, and the inner side wall of the annular groove is provided with a locking groove that matches the locking block. The right end face of the left shell is provided with a number of notches corresponding to the locking blocks, and each locking block is located in the corresponding locking groove.

[0012] Furthermore, the polishing assembly includes a polishing disc fixedly mounted to the output shaft of the motor, and polishing sandpaper fixedly mounted on the left side of the polishing disc.

[0013] Furthermore, an annular channel is formed in the substrate, and the right end of each suction hole is connected to the annular channel. One end of the suction pipe is connected to the annular channel, and the other end of the suction pipe is connected to the suction device through a hose.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] I. This utility model, by setting up a housing and a filter screen, allows the motor to rotate and drive the polishing assembly to polish the wall surface during use. The heat generated by the motor is discharged through the heat dissipation holes on the housing, preventing the motor from overheating and affecting its operation. The filter screen prevents dust from entering the space on the left side of the filter screen, thereby preventing dust from adversely affecting the motor.

[0016] II. This utility model, by setting up a left housing, a right housing, a filter screen, a fixing ring, and fastening bolts, allows for easy removal of the filter screen from the right housing when it is necessary to replace or clean it. Each limiting block on the fixing ring slides out of the groove in the right housing, thus removing the filter screen from the right housing. The filter screen can then be cleaned or replaced, and the interior of the right housing is also cleaned, enabling the device to quickly remove the filter screen from the right housing as needed. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0018] Figure 2 This is a front view structural diagram of the present utility model;

[0019] Figure 3 This is a schematic diagram of the three-dimensional structure of the brush bristles in this utility model;

[0020] Figure 4 This is a schematic diagram of the internal three-dimensional structure of the shell in this utility model;

[0021] Figure 5 This is a three-dimensional structural diagram of the suction cup and substrate in the detached state of this utility model;

[0022] Figure 6 This is a three-dimensional structural diagram of the polishing component in this utility model;

[0023] Figure 7 This is a schematic diagram of the three-dimensional structure of the substrate in this utility model;

[0024] Figure 8 This is a three-dimensional structural diagram of the left shell in this utility model;

[0025] Figure 9 This is a three-dimensional structural diagram of the motor in this utility model;

[0026] Figure 10 This is a three-dimensional structural diagram of the right shell of this utility model;

[0027] Figure 11 This is a schematic diagram of the internal three-dimensional structure of the left shell in this utility model;

[0028] Figure 12 This is a three-dimensional structural diagram of the fastening bolt in this utility model;

[0029] Figure 13 This is a three-dimensional structural diagram of the filter screen in this utility model.

[0030] In the diagram: 1. Base plate; 2. Suction cup; 3. Motor; 4. Output shaft; 5. Polishing assembly; 6. Suction pipe; 7. Suction hole; 8. Hose; 9. Housing; 10. Heat dissipation hole; 11. Filter screen; 12. Cooling fan; 13. Exhaust hole; 14. Left housing; 15. Right housing; 16. Fixing ring; 17. Limiting block; 18. Slide groove; 19. Fastening bolt; 20. Threaded hole; 21. Screw hole; 22. Annular protrusion; 23. Locking block; 24. Annular groove; 25. Locking slot; 26. Notch; 27. Polishing disc; 28. Polishing sandpaper; 29. ​​Annular channel; 30. Brush bristles. Detailed Implementation

[0031] Please see Figure 1-13 The present invention will now be described in detail with reference to the accompanying drawings and embodiments. In the following embodiments, directional terms will be used in conjunction with the provided drawings. Figure 4 For reference:

[0032] The handheld polishing device of this utility model includes a base plate 1. A suction cup 2 is fixedly mounted on the left side of the base plate 1, and a motor 3 is fixedly mounted on the right side of the base plate 1. The output shaft 4 of the motor 3 extends to the left through the base plate 1 and is fixedly mounted with a polishing assembly 5, which is located inside the suction cup 2. By placing the polishing assembly 5 on a wall and then starting the motor 3 to drive the polishing assembly 5 to rotate and polish the wall, the suction cup 2 adheres to the wall during polishing, saving the operator the effort required to hold the polishing device. At the same time, the debris and dust generated during polishing are absorbed and collected by the suction cup 2, reducing the workload. The dust-removing effect is achieved by moving the handheld polishing device to polish the entire wall surface. The base plate 1 is equipped with a suction pipe 6, one end of which is connected to each suction hole 7 on the suction cup 2. The other end of the suction pipe 6 is connected to the vacuuming device through a hose 8. When in use, the vacuuming device is activated to create a vacuum through the hose 8 and the suction pipe 6, so that each suction hole 7 on the suction cup 2 generates negative pressure, thereby enabling the suction cup 2 to adsorb the wall surface and absorb debris and dust. The vacuuming device is existing technology and can be any commercially available vacuum cleaner connected through the hose 8, which will not be described in detail here.

[0033] During wall polishing, although a dust extraction device is used to reduce dust in the working environment, dust is still inevitably present, which can affect the operation of the motor 3. Dust entering the motor 3 can also reduce its service life. To solve this problem, in this embodiment, a housing 9 is fixedly installed on the right side of the substrate 1, and the motor 3 is located inside the housing 9. Several heat dissipation holes 10 are provided on the right end face of the housing 9, and a filter screen 11 is installed inside the housing 9 on the right side of the motor 3. During operation, the motor 3 rotates, driving the polishing assembly 5 to rotate and polish the wall. The heat generated by the motor 3 is discharged through the heat dissipation holes 10 to prevent the motor 3 from overheating and affecting its operation. The filter screen 11 has the effect of preventing dust from entering the space on the left side of the filter screen 11, thus preventing adverse effects on the motor 3.

[0034] To enhance the heat dissipation of the motor 3 during operation, in this embodiment, a cooling fan 12 is coaxially fixed on the output shaft 4 of the motor 3, located between the motor 3 and the substrate 1. Several exhaust holes 13 are formed on the circumferential surface of the housing 9, located between the cooling fan 12 and the substrate 1. During operation, the motor 3 rotates, driving the polishing assembly 5 to grind the wall surface. Simultaneously, the output shaft 4 of the motor 3 drives the cooling fan 12 to rotate. The rotating cooling fan 12 draws outside air into the housing 9 through the heat dissipation holes 10. The air flows to the left, passes through the filter screen 11, and carries away the heat from the motor 3's outer surface. Then, the air passes through the cooling fan 12 into the space between the cooling fan 12 and the substrate 1, and is discharged from the exhaust holes 13 of the housing 9. This achieves forced heat dissipation of the motor 3's outer surface, creating an airflow circulation within the housing 9 and enhancing the motor 3's heat dissipation effect. The filter screen 11 reduces dust contamination of the motor 3, improves the quality of the motor 3's working environment, and increases the motor 3's service life.

[0035] In order to facilitate the replacement of the filter screen 11, in this embodiment, the housing 9 includes a left housing 14 and a right housing 15. The filter screen 11 is fixedly disposed inside the right housing 15, and the motor 3 is located inside the left housing 14. The left end of the right housing 15 is snapped into the right end of the left housing 14. When it is necessary to replace the filter screen 11 or clean the filter screen 11, the right housing 15 is removed from the left housing 14, and then the right housing 15 and the filter screen 11 are cleaned.

[0036] To facilitate the disassembly and installation of the filter screen 11 relative to the right housing 15, in this embodiment, a fixing ring 16 is fixedly provided on the circumferential surface of the filter screen 11. A plurality of limiting blocks 17 are uniformly fixed on the outer surface of the fixing ring 16 in the left-right direction. A plurality of sliding grooves 18 corresponding to the limiting blocks 17 are opened on the left end of the inner sidewall of the right housing 15 in the left-right direction. Each limiting block 17 is located in the corresponding sliding groove 18, realizing the connection between the fixing ring 16 and the right housing 15, and at the same time realizing the connection between the filter screen 11 and the right housing 15 through the fixing ring 16. When it is necessary to replace the filter screen 11 or clean the filter screen 11, the right housing 15 is removed from the left housing 14, and then each limiting block 17 on the fixing ring 16 slides out from the sliding groove 18 of the right housing 15, realizing the purpose of removing the filter screen 11 from the right housing 15. Then the filter screen 11 is cleaned or replaced, and the inside of the right housing 15 is cleaned at the same time.

[0037] During use, the filter screen 11 will always be subjected to the suction of the cooling fan 12, which may cause the filter screen 11 and the fixing ring 16 to shift to the left. To solve this problem, in this embodiment, the circumferential surface of the right housing 15 is provided with several through holes corresponding to the sliding groove 18. Each through hole is provided with a fastening bolt 19. The outer side of each limiting block 17 of the fixing ring 16 is provided with a threaded hole 20 in the radial direction. Each fastening bolt 19 is threadedly connected to the corresponding threaded hole 20 to realize the fixed connection between the fixing ring 16 and the right housing 15. This prevents the filter screen 11 from moving to the left due to the suction of the cooling fan 12 during use. When disassembling, first remove the right housing 15 from the left housing 14, then remove the fastening bolts 19, and then slide the fixing ring 16 to the left to remove the filter screen 11 from the right housing 15 for cleaning or replacement.

[0038] When removing the retaining ring 16 from the right housing 15, it is necessary to move the retaining ring 16 to the left. In order to facilitate the driving of the retaining ring 16 to move to the left, in this embodiment, each limiting block 17 has a screw hole 21 on its left end face that matches the fastening bolt 19 along the axial direction. The screw hole 21 passes through the left end face and the right end face of the limiting block 17. When it is necessary to remove the filter screen 11 from the right housing 15, the fastening bolt 19 is screwed into the screw hole 21 until the head of the fastening bolt 19 protrudes from the right end face of the limiting block 17. Continue to tighten the fastening bolt 19. The head of the bolt abuts against the inner bottom wall of the sliding groove 18 of the right housing 15, and the retaining ring 16 can be pushed out to the left from the right housing 15, which facilitates the removal of the retaining ring 16.

[0039] In this embodiment, an annular protrusion 22 is coaxially fixedly provided on the left end face of the right housing 15, and a plurality of locking blocks 23 are uniformly fixedly provided on the inner sidewall of the annular protrusion 22. An annular groove 24 is coaxially provided on the right end face of the left housing 14, and a locking groove 25 adapted to the locking block 23 is provided on the inner sidewall of the annular groove 24. A plurality of notches 26 corresponding to the locking blocks 23 are provided on the right end face of the left housing 14, and each locking block 23 is located in the corresponding locking groove 25. When installing the right housing 15, the annular protrusion 22 of the right housing 15 is inserted into the groove. The right housing 15 is rotated so that each locking block 23 enters the corresponding notch 26 within the annular groove 24 of the left housing 14. Then, the right housing 15 is rotated so that each locking block 23 enters the corresponding slot 25. This achieves the locking of the right housing 15 and the left housing 14, facilitating the disassembly and installation of the right housing 15. When disassembling the right housing 15, the right housing 15 is rotated so that each locking block 23 disengages from the corresponding slot 25, thereby completely separating the right housing 15 from the left housing 14 and achieving the purpose of disassembling the right housing 15.

[0040] In this embodiment, the polishing assembly 5 includes a polishing disc 27 fixedly disposed with the output shaft 4 of the motor 3. A polishing sandpaper 28 is fixedly disposed on the left side of the polishing disc 27. The polishing sandpaper 28 and the polishing disc 27 are glued together. In use, the motor 3 drives the polishing disc 27 to rotate, and the polishing disc 27 drives the sandpaper to rotate, thus polishing the wall surface with the sandpaper.

[0041] In this embodiment, an annular channel 29 is provided in the substrate 1. The right end of each suction hole 7 is connected to the annular channel 29. One end of the suction pipe 6 is connected to the annular channel 29, and the other end of the suction pipe 6 is connected to the suction device through the hose 8. The suction device draws a vacuum into the annular channel 29 through the hose 8 and the suction pipe 6, so that each suction hole 7 on the suction cup 2 generates negative pressure, thereby achieving the purpose of the suction cup 2 adsorbing the wall surface and absorbing debris and dust.

[0042] In this embodiment, a brush bristle 30 is fixedly provided on the left side of the suction cup 2, which facilitates the replacement of the suction cup 2 and its adhesion to the wall.

[0043] The working principle of this utility model is as follows: During use, the vacuuming device is activated, drawing a vacuum through the hose 8 and suction pipe 6, creating negative pressure in each suction hole 7 on the suction cup 2, thus enabling the suction cup 2 to adhere to the wall surface and absorb debris and dust. Then, the motor 3 is activated, driving the polishing disc 27 and sandpaper 28 to rotate and polish the wall surface. During polishing, the generated debris and dust are absorbed and collected by the suction holes 7 of the suction cup 2. Simultaneously, the motor 3 drives the cooling fan 12, which in turn causes airflow within the housing 9. The airflow path is as follows: outside air enters the housing 9 through the heat dissipation holes 10 and flows to the left. The air passes through the filter screen 11 and over the outer surface of the motor 3, carrying away heat from the motor 3's outer casing. Then, the air flows... The air enters the space between the cooling fan 12 and the base plate 1, and then exits through the exhaust hole 13 on the housing 9, achieving air circulation within the housing 9 and enhancing the heat dissipation capacity of the motor 3. When the filter screen 11 needs to be cleaned or replaced, rotate the right housing 15 so that each locking block 23 disengages from its corresponding slot 25, and then the right housing 15 is completely separated from the left housing 14. Then remove the fastening bolt 19 and screw the fastening bolt 19 into the screw hole 21 of the limiting block 17. Tighten the fastening bolt 19 into the screw hole 21 until the head of the fastening bolt 19 protrudes from the right end face of the limiting block 17, and the fixing ring 16 can be pushed out from the right housing 15 to the left, making it easy to remove the fixing ring 16. Then the filter screen 11 can be cleaned or replaced.

Claims

1. A handheld polishing device, comprising a base plate (1), a suction cup (2) fixedly disposed on the left side of the base plate (1), a motor (3) fixedly disposed on the right side of the base plate (1), the output shaft (4) of the motor (3) extending to the left through the base plate (1), and a polishing assembly (5) fixedly disposed thereon, the polishing assembly (5) being located inside the suction cup (2), a suction pipe (6) disposed on the base plate (1), one end of the suction pipe (6) communicating with each suction hole (7) on the suction cup (2), and the other end of the suction pipe (6) communicating with a vacuuming device through a flexible hose (8), characterized in that: A housing (9) is fixedly installed on the right side of the substrate (1), and the motor (3) is located inside the housing (9). Several heat dissipation holes (10) are opened on the right end face of the housing (9), and a filter screen (11) is installed inside the housing (9) on the right side of the motor (3).

2. The handheld polishing device according to claim 1, characterized in that: A cooling fan (12) is coaxially fixed on the output shaft (4) of the motor (3) located between the motor (3) and the base plate (1). Several exhaust holes (13) are opened on the circumferential surface of the housing (9), and the exhaust holes (13) are located between the cooling fan (12) and the base plate (1).

3. The handheld polishing device according to claim 2, characterized in that: The housing (9) includes a left housing (14) and a right housing (15). The filter screen (11) is fixedly installed inside the right housing (15), and the motor (3) is located inside the left housing (14). The left end of the right housing (15) is engaged with the right end of the left housing (14).

4. The handheld polishing device according to claim 3, characterized in that: The filter screen (11) is fixedly provided with a fixing ring (16) on its circumference. A number of limiting blocks (17) are evenly fixed on the outer surface of the fixing ring (16) along the left and right directions. A number of sliding grooves (18) corresponding to the limiting blocks (17) are opened on the left end of the inner wall of the right shell (15) along the left and right directions. Each limiting block (17) is located in the corresponding sliding groove (18).

5. The handheld polishing device according to claim 4, characterized in that: The right housing (15) has several through holes corresponding to the sliding groove (18) on its circumferential surface. Each through hole is fitted with a fastening bolt (19). The outer side of each limiting block (17) of the fixing ring (16) is fitted with a threaded hole (20) on its radial side. Each fastening bolt (19) is threadedly connected to the corresponding threaded hole (20) to achieve a fixed connection between the fixing ring (16) and the right housing (15).

6. The handheld polishing device according to claim 5, characterized in that: Each limiting block (17) has a screw hole (21) on its left end face that matches the fastening bolt (19) along the axial direction. The screw hole (21) passes through the left and right end faces of the limiting block (17).

7. The handheld polishing device according to claim 3, characterized in that: The left end face of the right shell (15) is coaxially fixed with an annular protrusion (22), and a number of locking blocks (23) are uniformly fixed on the inner side wall of the annular protrusion (22). The right end face of the left shell (14) is coaxially provided with an annular groove (24), and a locking groove (25) adapted to the locking block (23) is provided on the inner side wall of the annular groove (24). The right end face of the left shell (14) is provided with a number of notches (26) corresponding to the locking block (23), and each locking block (23) is located in the corresponding locking groove (25).

8. The handheld polishing device according to claim 1, characterized in that: The polishing assembly (5) includes a polishing disc (27) fixedly disposed on the output shaft (4) of the motor (3), and polishing sandpaper (28) is fixedly disposed on the left side of the polishing disc (27).

9. The handheld polishing device according to claim 1, characterized in that: The substrate (1) has an annular channel (29) inside. The right end of each suction hole (7) is connected to the annular channel (29). One end of the suction pipe (6) is connected to the annular channel (29), and the other end of the suction pipe (6) is connected to the suction device through a hose (8).

10. The handheld polishing device according to claim 1, characterized in that: The left side of the suction cup (2) is fixedly provided with bristles (30).

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