Grinding tool

Abstract

The present application relates to a kind of grinding tools, including shell, motor assembly, fan assembly and output, shell is equipped with air inlet and air outlet;Shell includes the baffle assembly that is protruded from inner wall and is formed by the air flow passage that baffle assembly surrounds, air flow passage includes the air inlet of introduction external airflow, the air outlet of discharge external airflow and the dust collection chamber formed in the path of air flow passage, dust collection chamber has the dust outlet that is communicated with outside, grinding tool includes the sealing plate that is movably arranged in dust outlet, sealing plate moves between the first position of closing dust outlet and the second position of opening dust outlet.In the present application, when sealing plate is in the first position, dust collection chamber can effectively collect dust and dirt carried in cooling air;And sealing plate is in the second position, dust and dirt collected in dust collection chamber can also be smoothly discharged from dust outlet, high practicability.

Description

Technical Field

[0001] This invention relates to the field of handheld power tools, and particularly to a grinding tool used in decoration, construction and other applications. Background Technology

[0002] Handheld power tools are a type of instrument in which a motor assembly drives a working head via a transmission assembly. The motor assembly is housed within a housing that forms a gripping area for the user. Traditional handheld power tools, particularly grinding tools, have a working head constructed as a grinding disc or polishing disc. These tools have a working head positioned at the front and a cylindrical housing extending rearward from the working head. The motor assembly, serving as the drive source, is housed within the cylindrical housing, and the grinding or polishing disc is used to perform the grinding operation.

[0003] In grinding operations using the aforementioned grinding tools, dust such as chips generated from the workpiece material enters the housing along with the cooling air used to cool the motor assembly, which can lead to malfunctions in the motor assembly. Furthermore, due to the working environment of the tool, especially when grinding metal parts, the cooling air carries a large amount of iron filings from the environment. When passing through the gap between the stator and rotor of the motor assembly, the iron filings are attracted and accumulated by the rotor, which has permanent magnets, causing contact friction between the rotor, iron filings, and stator, and even blockage.

[0004] To address the aforementioned issues, see Chinese Invention Patent No. CN201910097848.3, filed on January 31, 2019. This patent incorporates a dust cover at the air inlet of the casing, while using an AC brushless motor. While the dust cover reduces airflow, the large power margin of the AC brushless motor effectively compensates for this. However, over time, dust accumulates in the pores of the dust cover, leading to a loss of cooling effect. Therefore, users need to clean the dust cover regularly. In reality, users often neglect to pay attention to and clean the dust cover, frequently resulting in serious consequences such as rotor demagnetization and stator burnout.

[0005] Therefore, it is indeed necessary to provide an improved grinding tool to overcome the shortcomings of the existing technology. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of this invention is to provide a grinding tool with an improved dust removal device.

[0007] The present invention solves the problems of the prior art by adopting the following technical solution: A grinding tool includes a housing, a motor assembly installed in the housing, a fan assembly driven by the motor assembly, and an output end connected to the motor assembly. The housing has an air inlet and an air outlet. External airflow enters from the air inlet, flows through the motor assembly, and exits from the air outlet. The housing includes a baffle assembly protruding from the inner wall and an airflow channel formed by the baffle assembly. The airflow channel includes an air inlet for introducing external airflow, an air outlet for discharging external airflow, and a dust collection chamber formed in the path of the airflow channel. The dust collection chamber has a dust discharge port communicating with the outside. The grinding tool includes a sealing plate movably disposed at the dust discharge port. The sealing plate moves between a first position closing the dust discharge port and a second position opening the dust discharge port.

[0008] A further improvement is as follows: The grinding tool includes a switch assembly mounted on the housing and a linkage mechanism connected between the switch assembly and the sealing plate. The switch assembly has a first state of activating the motor assembly and a second state of not activating the motor assembly. In the first state, the sealing plate is located in the first position and closes the dust outlet. In the second state, the sealing plate is located in the second position and opens the dust outlet. The switch assembly switches between the first state and the second state, and drives the sealing plate to switch between the first position and the second position via the linkage mechanism.

[0009] A further improvement is as follows: the linkage mechanism includes a lever that rotates around a fulcrum, the lever including a first end and a second end located on both sides of the fulcrum, the first end abutting against the switch assembly, and the second end abutting against the sealing plate.

[0010] A further improvement is as follows: the sealing plate includes a pivot shaft, an elastic element disposed on the pivot shaft, a cover plate for closing the dust outlet, and a connecting arm connected to the lever, wherein the cover plate and the connecting arm are located on both sides of the pivot shaft.

[0011] A further improvement is that the sealing plate also includes a support arm that extends from the connecting arm toward the baffle assembly. In the second state, the support arm abuts against the baffle assembly and blocks the air outlet.

[0012] A further improvement is as follows: the connecting arm includes a first arm protruding from the pivot axis and a second arm bent toward the lever from the end of the first arm; the support arm is located at the connection position of the first arm and the second arm; the support arm and the first arm have the same extending direction.

[0013] A further improvement is as follows: the baffle assembly includes a first baffle and a second baffle extending from the air inlet, a third baffle bent from the end of the first baffle, a fourth baffle bent from the end of the third baffle, and a fifth baffle spaced apart from the second baffle. The air outlet is formed between the fourth baffle and the fifth baffle. The second baffle, the fifth baffle, and the sealing plate form the dust collection chamber.

[0014] A further improvement is as follows: the airflow channel includes a first airflow channel formed by the first baffle, the second baffle and the third baffle, and a second airflow channel formed by the second baffle, the third baffle and the fourth baffle. External airflow enters from the air inlet, flows through the first airflow channel and the second airflow channel in sequence, and then flows out from the air outlet.

[0015] A further improvement is as follows: the second airflow channel has a first central surface, the air outlet has a second central surface, and the included angle between the first central surface and the second central surface is no greater than 90 degrees.

[0016] A further improvement is that the end of the second airflow channel, the inlet of the dust collection chamber, and the outlet are combined, and the dust carried in the external airflow enters the dust collection chamber.

[0017] A further improvement is that the second baffle is located between the first airflow channel and the dust collection chamber, and isolates the first airflow channel and the dust collection chamber.

[0018] A further improvement is as follows: the housing includes a first part that houses the motor assembly, a second part connected to the rear side of the first part, and a third part connected to the front side of the first part. The second part is equipped with a switch assembly and forms a gripping part for the user to hold. The output end is located in the third part, and the air inlet is located in the second part and at the end away from the output end.

[0019] Compared with the prior art, the present invention has the following beneficial effects: When the sealing plate of the grinding tool is in the first position, the dust collection chamber can effectively collect dust and debris entrained in the cooling air; when the sealing plate is in the second position, the dust and debris collected in the dust collection chamber can also be smoothly discharged from the dust outlet, greatly improving practicality. By setting a linkage mechanism between the switch assembly and the sealing plate, the user does not need to specifically empty the dust and debris in the dust collection chamber, and when the grinding tool is not running, the sealing plate automatically opens the dust outlet to empty the dust and debris, which is ingenious and provides a good user experience. When the dust and debris entrained in the external airflow passes through the second airflow channel, it will hit the fourth baffle and fall down along the inner wall of the fourth baffle. The included angle of no more than 90 degrees ensures that the dust and debris will not fall into the air outlet along the inner wall of the fourth baffle; and the support arm set on the sealing plate can effectively block the air outlet to achieve negative pressure isolation between the dust and debris in the dust collection chamber and the motor assembly in the tail speed stage. Attached Figure Description

[0020] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings:

[0021] Figure 1 This is a schematic diagram of the entire machine according to a preferred embodiment of the grinding tool of the present invention;

[0022] Figure 2 yes Figure 1 A schematic diagram of the entire grinding tool from another angle;

[0023] Figure 3 yes Figure 1 A schematic diagram of the entire grinding tool from another angle;

[0024] Figure 4 yes Figure 2 A cross-sectional schematic diagram of the grinding tool shown;

[0025] Figure 5 yes Figure 4 An enlarged view of circle A in the grinding tool shown;

[0026] Figure 6 yes Figure 1 A schematic diagram of the external structure of the housing with the dust exhaust port closed in the grinding tool shown;

[0027] Figure 7 yes Figure 1 A schematic diagram of the internal structure of the housing with the dust exhaust port closed in the grinding tool shown;

[0028] Figure 8 yes Figure 6 A schematic diagram of the external structure of the housing with the dust discharge port open;

[0029] Figure 9 yes Figure 7 The diagram shows the internal structure of the housing with the dust outlet open. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0031] The terminology used in this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," "rear," "left," and "right" that indicate orientation or positional relationship are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0032] Please see Figures 1 to 4 As shown, a preferred embodiment of the present invention relates to an angle grinder 100, which includes a housing 1, a motor assembly 2 installed in the housing 1, a controller assembly 9 electrically connected to the motor assembly 2, a switch assembly 7 installed in the housing 1, a fan assembly 3 driven by the motor assembly 2, an output end 10 driven by the motor assembly 2, a transmission assembly 20 connected between the motor assembly 2 and the output end 10, and a grinding disc 200 installed on the output end 10. When powered by an external power source, the motor assembly 2 drives the transmission assembly 20 to move, thereby driving the output end 10 and the grinding disc 200 thereon to rotate, thereby performing polishing, grinding, cutting and other operations on the workpiece.

[0033] In this embodiment, the housing 1 includes an air inlet 11 and an air outlet 12 on both sides of the motor assembly 2, a first part 13 that houses the motor assembly 2, a second part 14 connected to the rear side of the first part 13, a third part 15 connected to the front side of the first part 13, and a protective cover assembly 16 mounted on the third part 15. The grinding disc 200 is at least partially housed in the protective cover assembly 16, and the opening 161 of the protective cover assembly 16 faces the front, exposing the grinding disc 200 to the opening 161.

[0034] Please see Figure 4 As shown, the second part 14 is equipped with a switch assembly 7 and has a gripping part for the user to hold. The output end 10 and the transmission assembly 20 are located in the third part 15. The motor shaft 21 of the motor assembly 2 protrudes into the third part 15. The motor teeth 22 fixed on the motor shaft 21 mesh with the transmission assembly 20. The transmission assembly 20 is a bevel gear. The output end 10 passes through and is fixed to the bevel gear 20. The output end 10 protrudes to the lower side of the third part 15 and extends into the protective cover assembly 16. The grinding disc 200 is installed at the end of the output end 10.

[0035] In this embodiment, the fan assembly 3 is mounted on the motor shaft 21 and located at the connection between the first part 13 and the third part 15. The controller assembly 9 is located at the connection between the first part 13 and the second part 14. The controller assembly 9 is disposed between the switch assembly 7 and the motor assembly 2. The controller assembly 9 receives a trigger signal from the switch assembly 7 and controls the motor assembly 2 to start and stop. Furthermore, the air inlet 11 is located in the first part 13 and the second part 14, directly opposite the controller assembly 9, and the air outlet 12 is located in the third part 15. When the motor assembly 2 is working, it drives the fan assembly 3 to rotate at high speed and generate negative pressure. External cooling air is drawn into the housing 1 through the air inlet 11, flows sequentially through the controller assembly 9 and the motor assembly 2, and is then discharged outward from the air outlet 12.

[0036] In this embodiment, in order to prevent dust from entering the housing 1 during the operation of the angle grinder 100, a dustproof net 18 is also provided at the air inlet 11. The dustproof net 18 has a plurality of grid-shaped air inlet holes 181 evenly distributed on it to effectively block dust.

[0037] Please see Figure 4 As shown, the aforementioned switch assembly 7 includes a switch element 71 electrically connected to the controller assembly 9 and a switch trigger 72 that triggers the switch element 71. The end of the switch trigger 72 is rotatably connected to the housing 1, allowing the user to easily operate the switch trigger 72 by gripping the grip portion with one hand. Furthermore, the angle grinder 100 also includes an auxiliary handle 300 mounted on the third part 15, such that the grip portion and the auxiliary handle 300 are positioned on opposite sides of the housing 1, allowing the user to grip the grip portion with one hand and the auxiliary handle 300 with the other, making operation more comfortable.

[0038] Please see Figure 4 and Figure 5 As shown, the aforementioned housing 1 includes a baffle assembly 4 protruding from the inner wall and an airflow channel 5 formed by the baffle assembly 4. The airflow channel 5 includes an air inlet 51 for introducing external airflow, an air outlet 52 for discharging external airflow, and a dust collection chamber 50 formed in the path of the airflow channel. The air inlet 51 penetrates the side wall of the housing 1 and connects to the outside, so as to introduce external cooling air into the housing 1. Under the action of the fan assembly 3, the external cooling air enters through the air inlet 51 and flows out from the air outlet 52. The outflowing cooling air flows sequentially through the switch assembly 7, the controller assembly 9, and the motor assembly 2, and then is discharged outward from the air outlet 12. By adding the baffle assembly 4 and the airflow channel 5 formed by the baffle assembly 4 to the housing 1, an additional air inlet 51 is added on the basis of the existing air inlet 11, increasing the air intake of the angle grinder 100, thereby effectively improving the heat dissipation effect of the angle grinder 100.

[0039] In this embodiment, the air inlet 51 is located at the end of the second part 14 of the housing 1, away from the output end 10. Compared with the air inlet 11, the air inlet 51 is located further away from the grinding disc 200. The dust generated during operation is concentrated near the grinding disc 200. The dust concentration at the air inlet 51 is lower than that at the air inlet 11. Therefore, dust is less likely to enter the housing 1 from the air inlet 51. Even if a small amount of dust enters the housing 1 from the air inlet 51, the dust collection chamber 50 located in the airflow channel can effectively collect the dust, preventing the dust from reaching the switch assembly 7, controller assembly 9 and motor assembly 2 inside the housing 1.

[0040] Furthermore, the air inlet 51 is located on the rear side of the switch trigger 72 and on the axis of the motor shaft 21. The air inlet 51 and the switch trigger 72 do not overlap, so that the air inlet 51 will not interfere with the user when the user presses the switch trigger 72, and the user's palm will not easily block the air inlet 51, thus causing the air inlet 51 to malfunction.

[0041] Please combine Figures 6 to 9 As shown, the dust collection chamber 50 has a dust discharge port 53 that connects to the outside, and the angle grinder 100 includes a sealing plate 6 that is movably disposed in the dust discharge port 53. The sealing plate 6 moves between a first position that closes the dust discharge port 53 and a second position that opens the dust discharge port 53. When the sealing plate 6 is in the first position, the dust collection chamber 50 can effectively collect dust particles entrained in the cooling air; when the sealing plate 6 is in the second position, the dust particles collected in the dust collection chamber 50 can also be smoothly discharged from the dust discharge port 53, which greatly improves practicality.

[0042] Please see Figure 5 As shown, the baffle assembly 4 includes a first baffle 41 and a second baffle 42 extending from the air inlet 51, a third baffle 43 bent from the end of the first baffle 41, a fourth baffle 44 bent from the end of the third baffle 43, and a fifth baffle 45 spaced apart from the second baffle 42. An air outlet 52 is formed between the fourth baffle 44 and the fifth baffle 45. The second baffle 42, the fifth baffle 45, and the sealing plate 6 together form a dust collection chamber 50.

[0043] In this embodiment, the airflow channel 5 includes a first airflow channel 54 formed by a first baffle 41, a second baffle 42 and a third baffle 43, and a second airflow channel 55 formed by a second baffle 42, a third baffle 43 and a fourth baffle 44. External airflow enters from the air inlet 51, flows through the first airflow channel 54 and the second airflow channel 55 in sequence, and then flows out from the air outlet 52. The dust particles carried in the external airflow will fall downward into the dust collection chamber 50 due to their own inertia.

[0044] In this embodiment, the second baffle 42 is located between the first airflow channel 54 and the dust collection chamber 50, and isolates the first airflow channel 54 and the dust collection chamber 50.

[0045] In this embodiment, the first baffle 41, the third baffle 43 and the fourth baffle 44 are an integral whole and are arranged to form an opening shape, and the second baffle 42 extends into the opening shape.

[0046] Furthermore, the end of the second airflow channel 55, the inlet of the dust collection chamber 50, and the outlet 52 converge, allowing dust particles carried in the external airflow to smoothly enter the dust collection chamber 50.

[0047] In this embodiment, the second airflow channel 55 has a first central surface S1, and the air outlet 52 has a second central surface S2. The angle between the first central surface S1 and the second central surface S2 is no greater than 90 degrees. When dust particles carried in the external airflow pass through the second airflow channel 55, they will collide with the fourth baffle 44 and fall down along the inner wall of the fourth baffle 44. The angle of no more than 90 degrees prevents the dust particles from falling into the air outlet 52 along the inner wall of the fourth baffle 44.

[0048] Furthermore, on the axis of the motor shaft 21, the end of the fourth baffle 44 forming the air outlet 52 is closer to the air inlet 51 than the end of the fifth baffle 45. That is, the end of the fourth baffle 44 extends to the rear side of the end of the fifth baffle 45, so that dust can fall smoothly into the dust collection chamber 50 instead of falling into the air outlet 52.

[0049] Please see Figure 4 and Figure 5 As shown, the angle grinder 100 also includes a linkage mechanism 8 connected between the switch assembly 7 and the sealing plate 6. The switch assembly 7 has a first state of starting the motor assembly 2 and a second state of not starting the motor assembly 2. In the first state, the sealing plate 6 is in a first position and the dust discharge port 53 is closed; in the second state, the sealing plate 6 is in a second position and the dust discharge port 53 is open. The switch assembly 7 switches between the first and second states, and drives the sealing plate 6 to switch between the first and second positions via the linkage mechanism 8. By setting the linkage mechanism 8 between the switch assembly 7 and the sealing plate 6, the user does not need to specifically empty the dust in the dust collection chamber 50 during actual use, and the sealing plate 6 automatically opens the dust discharge port 53 to empty the dust when the angle grinder 100 is not running. The structure is ingenious and provides a good user experience.

[0050] Please see Figure 5As shown, the linkage mechanism 8 includes a lever 82 that rotates around the fulcrum 81. The lever 82 includes a first end 821 and a second end 822 located on both sides of the fulcrum 81. The first end 821 abuts against the switch assembly 7, and the second end 822 abuts against the sealing plate 6.

[0051] In this embodiment, the sealing plate 6 includes a pivot 61, an elastic member 62 disposed on the pivot 61, a cover plate 63 that closes the dust discharge port 53, a connecting arm 64 connected to the lever 82, and a support arm 65 protruding from the connecting arm 64 toward the baffle assembly 4. The elastic member 62 applies a force to the sealing plate 6 and causes the cover plate 63 to tend to open the dust discharge port 53. The cover plate 63 and the connecting arm 64 are located on both sides of the pivot 61. The connecting arm 64 includes a first arm 641 protruding from the pivot 61 and a second arm 642 bent toward the lever 82 from the end of the first arm 641. The support arm 65 is disposed at the connection position of the first arm 641 and the second arm 642, and the support arm 65 and the first arm 641 have the same extending direction.

[0052] In this embodiment, the elastic element 62 is a torsion spring.

[0053] Please combine Figure 7 and Figure 9 As shown, the switch assembly 7 includes an intermediate rod 73 connected between the switch trigger 72 and the first end 821. In the first state, when the user presses the switch trigger 72, the intermediate rod 73 presses against the lever 82, causing the lever 82 to rotate around the fulcrum 81, thereby causing the sealing plate 6 to overcome the force of the elastic member 62 and close the dust outlet 53. In the second state, when the user releases the switch trigger 72, the sealing plate 6 pivots and opens the dust outlet 53 under the force of the elastic member 62. In this state, the support arm 65 abuts against the fourth baffle 44 of the baffle assembly 4 and blocks the air outlet 52. When the switch assembly 7 is disconnected, the motor assembly 2 can still run for a short period of time due to inertia (referred to as the tail speed stage). During this tail speed stage, negative pressure can still be generated, which will have an adsorption force on the dust in the dust collection chamber 50. To avoid this phenomenon, when the sealing plate 6 is opened for chip removal, the support arm 65 set on the sealing plate 6 can effectively block the air outlet 52, so as to achieve negative pressure isolation between the dust in the dust collection chamber 50 and the motor assembly 2 during the tail speed stage.

[0054] This invention adds a baffle assembly 4 and an airflow channel 5 formed by the baffle assembly 4 to the housing 1, thereby increasing the air intake of the angle grinder 100 based on the existing air inlet 11 and effectively improving the heat dissipation of the angle grinder 100. A small amount of dust enters the housing 1 through the air inlet 51, and the dust collection chamber 50 set in the path of the airflow channel can also effectively collect the dust. Dust carried in the external airflow will collide with the fourth baffle 44 when passing through the second airflow channel 55 and fall down along the inner wall of the fourth baffle 44. The included angle of no more than 90 degrees prevents the dust from falling into the air outlet 52 along the inner wall of the fourth baffle 44. When plate 6 is in the first position, dust collection chamber 50 can effectively collect dust and debris entrained in the cooling air; when sealing plate 6 is in the second position, the dust and debris collected in dust collection chamber 50 can also be smoothly discharged from dust outlet 53, greatly improving practicality; by setting a linkage mechanism 8 between switch assembly 7 and sealing plate 6, the user does not need to specifically empty the dust and debris in dust collection chamber 50, and when the angle grinder 100 is not running, sealing plate 6 automatically opens dust outlet 53 to empty the dust and debris, which is ingenious and provides a good user experience; in addition, the support arm 65 set on sealing plate 6 can effectively block air outlet 52 to achieve negative pressure isolation between dust and debris in dust collection chamber 50 and motor assembly 2 during the tail speed stage.

[0055] This invention is not limited to the specific embodiments described above. Those skilled in the art will readily understand that many other alternatives to the grinding tool of this invention can be developed without departing from the principles and scope of the invention. The scope of protection of this invention is defined by the claims.

Claims

1. A grinding tool, comprising a housing, a motor assembly installed within the housing, a fan assembly driven by the motor assembly, and an output end connected to the motor assembly, wherein the housing has an air inlet and an air outlet, external airflow enters through the air inlet, flows through the motor assembly, and exits through the air outlet; characterized in that: The housing includes a baffle assembly protruding from its inner wall and an airflow channel formed by the baffle assembly. The airflow channel includes an inlet for introducing external airflow, an outlet for discharging external airflow, and a dust collection chamber formed along the path of the airflow channel. The dust collection chamber has a dust discharge port communicating with the outside. The inlet penetrates the side wall of the housing and communicates with the outside. The airflow channel includes a first airflow channel and a second airflow channel connected in sequence. External airflow enters from the inlet, flows through the first airflow channel and the second airflow channel in sequence, and then flows out from the outlet. The end of the second airflow channel, the inlet of the dust collection chamber, and the outlet converge, and dust carried in the external airflow enters the dust collection chamber. The grinding tool includes a sealing plate movably disposed at the dust discharge port and a switch assembly installed on the housing. The switch assembly and the sealing plate are connected by a linkage mechanism. The switch assembly drives the sealing plate to move between a first position where the dust outlet is closed and a second position where the dust outlet is open via the linkage mechanism. The linkage mechanism includes a lever that rotates around a fulcrum. The lever includes a first end and a second end located on both sides of the fulcrum. The first end abuts against the switch assembly, and the second end abuts against the sealing plate. The sealing plate includes a pivot shaft, an elastic element located on the pivot shaft, a cover plate that closes the dust outlet, and a connecting arm connected to the lever. The cover plate and the connecting arm are located on both sides of the pivot shaft. The sealing plate also includes a support arm that protrudes from the connecting arm toward the baffle assembly. In the second state, the support arm abuts against the baffle assembly and blocks the air outlet.

2. The grinding tool according to claim 1, characterized in that: The switching assembly has a first state of starting the motor assembly and a second state of not starting the motor assembly. In the first state, the sealing plate is located in the first position and closes the dust discharge port. In the second state, the sealing plate is located in the second position and opens the dust discharge port. The switching assembly switches between the first state and the second state and drives the sealing plate to switch between the first position and the second position via the linkage mechanism.

3. The grinding tool according to claim 2, characterized in that: The connecting arm includes a first arm extending from the pivot axis and a second arm bent toward the lever from the end of the first arm. The support arm is located at the connection position of the first arm and the second arm, and the support arm and the first arm have the same extending direction.

4. The grinding tool according to claim 1, characterized in that: The baffle assembly includes a first baffle and a second baffle extending from the air inlet, a third baffle bent from the end of the first baffle, a fourth baffle bent from the end of the third baffle, and a fifth baffle spaced apart from the second baffle. The air outlet is formed between the fourth baffle and the fifth baffle. The second baffle, the fifth baffle, and the sealing plate form the dust collection chamber.

5. The grinding tool according to claim 4, characterized in that: The first airflow channel is formed by the first baffle, the second baffle, and the third baffle, and the second airflow channel is formed by the second baffle, the third baffle, and the fourth baffle.

6. The grinding tool according to claim 5, characterized in that: The second airflow channel has a first central surface, and the air outlet has a second central surface. The angle between the first central surface and the second central surface is no greater than 90 degrees.

7. The grinding tool according to claim 5, characterized in that: The second baffle is located between the first airflow channel and the dust collection chamber, and isolates the first airflow channel and the dust collection chamber.

8. The grinding tool according to claim 1, characterized in that: The housing includes a first part housing the motor assembly, a second part connected to the rear side of the first part, and a third part connected to the front side of the first part. The second part is equipped with a switch assembly and has a gripping portion for a user to hold. The output end is located in the third part, and the air inlet is located in the second part at the end away from the output end.

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