Dust collecting device and polishing tool provided with the same

Abstract

The application discloses a dust collecting device and a polishing tool adopting the same, comprising: a dust collecting shell, which is formed with a containing cavity for dust collecting; an air inlet pipe, which is used for guiding dust collecting airflow to enter the containing cavity along a first straight line direction; a filtering assembly; an air duct pipe; an air outlet assembly; the filtering assembly comprises a first cyclone pipe, which extends along a second straight line direction, and the first cyclone pipe has a first air inlet end for air inlet and a first dust outlet end for dust outlet along the second straight line direction; a second cyclone pipe, which extends along a third straight line direction, and the second cyclone pipe extends along the third straight line direction; wherein the first cyclone pipe and the second cyclone pipe are arranged on both sides of the air inlet pipe, and the second straight line direction and the third straight line direction respectively intersect with the first straight line direction. The dust collecting device is compact in structure.

Description

Technical Field

[0001] This invention relates to a polishing tool, and more specifically to a dust collection device. Background Technology

[0002] Power tools such as sanders and angle grinders generate a lot of dust during operation. To avoid environmental pollution and harm to users, existing sanders are usually equipped with dust collection devices. However, existing dust collection devices have complex structures and large filter components that take up a significant portion of the dust collection housing, resulting in an excessively large dust collection device size. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a dust collection device that is compact in structure and can ensure effective dust collection.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a dust collection device, comprising: a dust collection housing having a receiving cavity for dust collection; an air inlet pipe for guiding the dust collection airflow into the receiving cavity along a first straight direction; a filter assembly disposed within the receiving cavity; an air duct forming an air duct connecting the air inlet pipe and the filter assembly; and an air outlet assembly connected to the filter assembly for discharging the dust collection airflow after it has been filtered by the filter assembly to the outside of the dust collection housing; the filter assembly comprising: a first cyclone tube extending along a second straight direction, the first cyclone tube having a first air inlet end for air intake and a first dust outlet end for dust discharge along the second straight direction; and a second cyclone tube extending along a third straight direction. The assembly has a second air inlet for air intake and a second dust outlet for dust discharge along a third straight direction; the air outlet component includes: a first air outlet pipe, disposed at the first air inlet of the first cyclone pipe, the first air outlet pipe being connected to the first cyclone pipe, the first air outlet pipe guiding the dust-collecting airflow filtered by the first cyclone pipe to the outside of the dust collection housing; a second air outlet pipe, disposed at the second air inlet of the second cyclone pipe, the second air outlet pipe being connected to the second cyclone pipe, the second air outlet pipe guiding the dust-collecting airflow filtered by the second cyclone pipe to the outside of the dust collection housing; wherein, the first cyclone pipe and the second cyclone pipe are disposed on both sides of the air inlet pipe, and the second straight direction and the third straight direction intersect the first straight direction respectively.

[0005] Furthermore, the first air outlet pipe is connected to the second air outlet pipe, and the first air outlet pipe and the second air outlet pipe are fixedly connected or integrally formed; the dust collection housing includes: a second housing part, which forms an air outlet that is connected to the first air outlet pipe and / or the second air outlet pipe; a first housing part, which is detachably connected to the second housing part; when the second housing part is attached to the first housing part, the first housing part and the second housing part surround to form a receiving cavity, and when the first housing part is detached from the second housing part, the receiving cavity is opened to form a dust outlet for emptying the dust in the receiving cavity.

[0006] Furthermore, the dust collection housing has a length direction extending along a first straight line. The dust collection housing includes a front end and a rear end in its length direction. The front end is formed by a first housing portion, and the rear end is formed by a second housing portion. The dust outlet is disposed on the second housing portion and is open towards the front end, while the air outlet is formed by a recess at the rear end.

[0007] Furthermore, the ratio of the length of the second housing portion in its longitudinal direction to the distance from the air inlet pipe to the filter assembly in the first straight line direction is greater than or equal to 1 / 3 and less than or equal to 2 / 3.

[0008] Furthermore, the air inlet pipe, filter assembly, duct pipe, and air outlet assembly are fixedly connected to the first housing portion, so that when the first housing portion is removed from the second housing portion, the air inlet pipe, filter assembly, duct pipe, and air outlet assembly can all be separated from the receiving cavity from the dust outlet.

[0009] Furthermore, the direction of the second line is perpendicular to the direction of the first line, and the second line coincides with the direction of the third line.

[0010] Furthermore, the dust collection device also includes a separation unit installed in the air inlet pipe and / or air duct. The separation unit is capable of dividing the dust collection airflow guided by the air inlet pipe into two air inlet paths that are symmetrical about a central dividing plane, and each air inlet path corresponds to a cyclone tube; wherein the first cyclone tube and the second cyclone tube are symmetrically arranged about the central dividing plane.

[0011] Furthermore, the dust collection housing has a width direction extending perpendicular to the first straight line direction. The dust collection housing includes a left end and a right end in the width direction. The ratio of the length between the inner walls of the left end and the right end in the width direction to the length from the first dust outlet end of the first cyclone tube to the midpoint is greater than or equal to 2 and less than or equal to 2.5.

[0012] Furthermore, the air outlet assembly also includes an air outlet section, which is connected to the first air outlet pipe and the second air outlet pipe. The air outlet section can guide the dust-collecting airflow from the first air outlet pipe and the second air outlet pipe to the outside of the dust collection housing. The air outlet section extends along the first straight line direction and is located between the first cyclone pipe and the second cyclone pipe. Attached Figure Description

[0013] Figure 1 This is a perspective view of the sander shown in this invention;

[0014] Figure 2 yes Figure 1 The sander shown is a cross-sectional view along the motor axis.

[0015] Figure 3 yes Figure 1 The diagram shows a three-dimensional view of the sander tool body and dust collection device separated.

[0016] Figure 4 yes Figure 3 A partial structural diagram of the tool's main body is shown.

[0017] Figure 5 yes Figure 3 An exploded view of the main body of the tool shown;

[0018] Figure 6 yes Figure 3 Exploded view of the dust collection device shown;

[0019] Figure 7 yes Figure 6 An exploded view of the dust collection device shown from another perspective;

[0020] Figure 8 yes Figure 7 A top view of the dust collection device's inlet duct, air duct, filter assembly, and outlet assembly;

[0021] Figure 9 yes Figure 7 A perspective view of the dust collection device's inlet duct, air duct, filter assembly, and outlet assembly;

[0022] Figure 10 yes Figure 2 A partial enlarged view of the sectional view shown;

[0023] Figure 11 yes Figure 3 A perspective view of the air guide, bearing housing, and base plate of the tool body shown;

[0024] Figure 12 yes Figure 11 The structure shown is a cross-sectional view along the motor axis.

[0025] Figure 13 yes Figure 12 A partial enlarged view of the sectional view shown;

[0026] Figure 14 yes Figure 3 A three-dimensional view of the air guide component of the main body of the tool shown;

[0027] Figure 15 yes Figure 14 A perspective view of the air guide component from another angle. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0029] like Figure 1The present invention illustrates a polishing tool, specifically a sander 100, which can drive the movement of a functional element, which can be sandpaper. By installing the functional element on the sander 100, the sander 100 can perform sanding and polishing on the surface of workpieces of various materials.

[0030] For ease of description, this application uses round sand as an example to describe the structure of this application, but it is not limited to round sand, and can also be triangular sand, flat sand, etc.

[0031] In addition, for the convenience of explaining the technical solution of the present invention, the following are also defined: Figure 1 The directions shown are front, back, left, right, top, and bottom.

[0032] like Figure 1 As shown, the sander 100 includes a tool body 100a and a dust collection device 200. The tool body 100a is a grinding tool, which generates a lot of dust during the grinding process. Therefore, it is necessary to install a dust collection device 200 for dust collection on this type of tool.

[0033] like Figures 1 to 4 As shown, the tool body 100a includes: a tool housing 10, a switch 20, a power assembly 30, a transmission assembly 40, a fan assembly 50, an eccentric element 60, an output mechanism 70, and an energy source 80.

[0034] The tool housing 10, which forms the outer shape of the tool body 100a, has at least a handle 110 and a receiving portion 120. The handle 110 is for the user to grip, with one end connected to the receiving portion 120 and the other end used to connect an external power cable or to form a connector for mounting a portable DC power supply such as a battery pack. The receiving portion 120 has a receiving space 121 inside, and the power assembly 30, transmission assembly 40, and output mechanism 70 are at least partially disposed within the receiving space 121.

[0035] The switch 20 is installed on the machine tool housing 10. Specifically, the switch 20 is installed on the handle 110, so that when the user holds the handle 110, the switch 20 can be triggered relatively easily, thus facilitating user operation.

[0036] The power assembly 30 includes a motor 31 for providing power to the sander 100, and the motor 31 is disposed within the tool housing 10. The motor 31 includes a motor shaft 311 for transmitting power to the transmission assembly 40, and the motor shaft 311 rotates about a motor axis 101. The motor axis 101 extends in a front-rear direction.

[0037] The transmission assembly 40 is disposed between the power assembly 30 and the output structure. The transmission assembly 40 is used to transmit the power output by the motor shaft 311 to the output shaft 71 of the output structure. That is, the output shaft 71 can be driven by the transmission assembly 40 to rotate around the first axis 102. In this embodiment, the output shaft 71 extends along the first axis 102.

[0038] An eccentric element 60 surrounds the output shaft 71 and is eccentrically positioned relative to the output shaft 71. The eccentric element 60 is mounted on the output shaft 71 and fixedly connected to the output arm. The eccentric positioning of the eccentric element 60 relative to the output shaft 71 means that the eccentric element 60 has a central axis (not shown in the figure), which is parallel to the first axis 102 and exists at a distance D between them. The existence of distance D allows the eccentric element 60 to transmit the power of the transmission assembly 40 to the rotation and revolution of other components connected to the eccentric element 60 when the transmission assembly 40 is driven to rotate by the motor shaft 311.

[0039] The fan assembly 50 is driven by the motor 31 to rotate. The fan assembly 50 includes a dust-collecting fan 51 and a heat-dissipating fan 52. The heat-dissipating fan is fixedly connected to the motor shaft 311. When the motor shaft 311 rotates, the heat-dissipating fan is driven by the motor shaft 311 to rotate around the motor axis 101, thereby generating a cooling airflow to dissipate heat from the motor 31 and other components inside the tool housing 10. An integrated fan is connected to the output shaft 71. The dust-collecting fan 51 is driven by the motor 31 to rotate around its central axis, generating a dust-collecting airflow to expel dust from the base plate assembly 710 outside the tool housing 10. In this embodiment, when the motor 31 rotates, the transmission assembly 40 drives the dust-collecting fan 51 to rotate, thereby driving the output shaft 71 to rotate.

[0040] The output structure also includes a base plate assembly 710, which can be driven by the output shaft 71, allowing it to swing relative to the machine tool housing 10. The base plate assembly 710 is fixedly connected to the eccentric element 60, meaning the output shaft 71 transmits the power output from the motor shaft 311 to the base plate assembly 710 via the eccentric element 60. The base plate assembly 710 includes a base plate 711, the bottom end of which is used to mount functional components such as sandpaper. Driven by the output shaft 71 and the eccentric element 60, the base plate 711 moves eccentrically relative to the output shaft 71. When the base plate 711 moves eccentrically, the sandpaper continuously rubs against the surface of the workpiece, thus achieving functions such as grinding and polishing.

[0041] The energy source 80 provides power to the sander 100. The energy source 80 can be AC ​​or DC, such as a portable power source like a battery pack. In this embodiment, the energy source 80 uses AC.

[0042] like Figure 3 As shown, the tool body 100a and the dust collection device 200 are detachably connected, allowing for selective determination of whether the dust collection device 200 needs to be installed on the tool body 100a for dust collection. Specifically, the tool housing 10 has an outlet 130 for discharging the dust-collecting airflow, and the dust collection device 200 is connected to a connecting pipe 215 that connects to the outlet 130. When the motor 31 is running, the dust-collecting airflow generated by the dust-collecting fan 51 discharges dust through the outlet 130 to the dust collection device 200.

[0043] like Figure 3 , Figures 6 to 7 As shown, the dust collection device 200 includes a dust collection housing 210 that generally forms the outer shape of the dust collection device 200. The dust collection housing 210 has a receiving cavity 211 for dust collection. The dust collection housing 210 includes a first housing part 212 and a second housing part 213. The first housing part 212 and the second housing part 213 are detachably connected. When the first housing part 212 is attached to the second housing part 213, the two together surround and form the receiving cavity 211. When the second housing part 213 is detached from the first housing part 212, the receiving cavity 211 is opened to form a dust outlet 214 for emptying the dust in the receiving cavity 211. Thus, when the user needs to clean the dust in the receiving cavity 211, the user only needs to detach the second housing part 213 from the first housing part 212, and the dust can be emptied through the open dust outlet 214. This can more thoroughly clean the dust in the receiving cavity 211, and the dust outlet 214 can be set to be relatively large, which is more conducive to emptying the dust. In addition, by forming a dust outlet 214 by making the second housing part 213 and the first housing part 212 detachably connected, the dust collection device 200 does not need to have a separate opening 2721 for emptying dust and a door for closing the opening 2721 on the dust collection housing 210, thereby making the structure of the dust collection device 200 simpler and easier to manufacture.

[0044] The dust collection housing 210 has a length direction extending along the first straight line 103. The second housing portion 213 has a rear end 215 formed in the length direction away from the tool body 100a. The second housing portion 213 includes a left end 216 and a right end 217 in the width direction extending perpendicular to the first straight line 103. The second housing portion 213 includes an upper end 218 and a lower end (not shown in the figure) in the height direction extending perpendicular to the first straight line 103. The rear end 215, left end 216, right end 217, upper end 218, and lower end surround the receiving cavity 211 of the dust outlet 214. The first housing portion 212 at least partially covers the front end of the dust outlet 214, and the front end is located near the outlet 130.

[0045] The dust collection device 200 also includes an inlet pipe 220, a filter assembly 230, an air duct 240, and an outlet assembly 250. The inlet pipe 220 guides the dust-collecting airflow along the first straight line 103 into the receiving cavity 211. The filter assembly 230 generates a cyclone, separating dust from the dust-collecting airflow. The air duct 240 connects the inlet pipe 220 and the filter assembly 230; it can also be understood as guiding the dust-collecting airflow entering from the inlet pipe 220 into the filter assembly 230. The outlet assembly 250 exhausts the dust-collecting airflow filtered by the filter assembly 230 to the outside of the dust collection housing 210. When the first housing portion 212 is attached to the second housing portion 213, the inlet pipe 220, filter assembly 230, air duct 240, and outlet assembly 250 are all disposed within the receiving cavity 211. The inlet pipe 220 is connected to and communicates with the connecting pipe 215 on the first housing portion 212. The air inlet pipe 220, filter assembly 230, air duct 240 and air outlet assembly 250 are fixedly connected to the first housing part 212, so that when the first housing part 212 is removed from the second housing part 213, the air inlet pipe 220, filter assembly 230, air duct 240 and air outlet assembly 250 can be separated from the receiving cavity 211 from the dust outlet 214. This ensures that there are no other components that would obstruct dust in the space surrounded by the second housing part 213, allowing the dust to be poured out more smoothly from the dust outlet 214.

[0046] Please refer to this as well. Figure 8 and Figure 9 The filter assembly 230 includes a first cyclone 231 and a second cyclone 232 that are fixedly connected to or integrally formed with the air duct 240. In this embodiment, the first cyclone 231 and the second cyclone 232 are fixedly connected to the air duct 240. The direction of the second straight line 104 extending from the first cyclone 231 intersects obliquely with the direction of the first straight line 103 into the dust-collecting airflow entering the air inlet duct 220, wherein the angle formed by the intersection of the second straight line 104 and the first straight line 103 is greater than or equal to 80 degrees and less than or equal to 100 degrees. Similarly, the direction of the third straight line 105 extending from the second cyclone 232 intersects obliquely with the direction of the first straight line 103 into the dust-collecting airflow entering the air inlet duct 220, wherein the angle formed by the intersection of the third straight line 105 and the first straight line 103 is greater than or equal to 85 degrees and less than or equal to 95 degrees. Through the above arrangement, the length of the filter assembly 230 in the first straight line 103 can be effectively shortened, thereby reducing the length of the dust collection device 200 in the first straight line 103, thus making the structure of the dust collection device 200 more compact. Alternatively, in cases where other structural inconveniences exist, the proportion of the filter assembly 230 within the receiving cavity 211 can be reduced, thereby increasing the dust and debris volume of the receiving cavity 211. Preferably, the angle formed by the intersection of the directions of the two straight lines 104 and the direction of the first straight line 103 is 90 degrees.

[0047] In this embodiment, the first cyclone tube 231 has a first air inlet end 2311 for air intake and a first dust outlet end 2312 for dust discharge along the second straight line 104. The second cyclone tube 232 has a second air inlet end 2321 for air intake and a second dust outlet end 2322 for dust discharge along the third straight line 105. That is, when the motor 31 is running, dust enters from the first air inlet end 2311 with the dust collection airflow and is discharged into the receiving cavity 211 from the first dust outlet end 2312. Similarly, dust also enters from the second air inlet end 2321 with the dust collection airflow and is discharged into the receiving cavity 211 from the second dust outlet end 2322, thereby achieving dust collection.

[0048] The air outlet assembly 250 includes a first air outlet pipe 251, a second air outlet pipe 252, and an air outlet section 253. The first air outlet pipe 251 is located at the first air inlet end 2311 of the first cyclone pipe 231, and is connected to the first cyclone pipe 231. The second air outlet pipe 252 is located at the second air inlet end 2321 of the second cyclone pipe 232, and is connected to the second cyclone pipe 232. The air outlet section 253 is connected to the first air outlet pipe 251 and the second air outlet pipe 252, and is located between the first cyclone pipe 231 and the second cyclone pipe 232. The air outlet section 253 extends along the direction of the first straight line 103 and is integrally formed with the first air outlet pipe 251 and the second air outlet pipe 252. The first air outlet pipe 251, the second air outlet pipe 252, and the air outlet section 253 are fixedly connected to or integrally formed with the air duct 240. The first air outlet duct 251 guides the dust-collected airflow filtered by the first cyclone duct 231 to the air outlet 253. Similarly, the second air outlet duct 252 guides the dust-collected airflow filtered by the second cyclone duct 232 to the air outlet 253. The air outlet 253 discharges the dust-collected gas from the first and second air outlet ducts 251 and the second air outlet duct 252 to the outside of the dust collection housing 210. The second housing 213 is also provided with an air outlet 219, which is used to discharge the dust-collected airflow from the air outlet 253. Specifically, the rear end 215 of the first housing 212 is recessed to form the air outlet 219, which corresponds to and communicates with the air outlet 253.

[0049] The dust collection device 200 further includes a separation section 260, which is used to divide the dust-collecting airflow guided by the air inlet duct 220 into two air inlet paths symmetrical about a dividing plane P, each air inlet path corresponding to a cyclone tube. The separation section 260 is installed inside the air inlet duct 220 and / or the air duct 240. In this embodiment, the separation section 260 is installed inside the air duct 240.

[0050] The first cyclone tube 231 and the second cyclone tube 232 are arranged on both sides of the dividing plane P, and the direction of the second straight line 104 is perpendicular to the direction of the first straight line 103, and the direction of the second straight line 104 coincides with the direction of the third straight line 105. That is to say, the first cyclone tube 231 and the second cyclone tube 232 are respectively arranged on both sides of the air duct 240. Furthermore, the first cyclone tube 231 and the second cyclone tube 232 are symmetrically arranged about the dividing plane P. This arrangement makes the length of the filter assembly 230 along the direction of the second straight line 104 smaller, thereby reducing the size of the first housing part 212 in the width direction, making the dust collection device 200 more compact.

[0051] The ratio of the length L1 of the first housing portion 212 in its width direction to the length L2 of the first dust outlet end 2312 of the first cyclone tube 231 to the midpoint P is greater than or equal to 2 and less than or equal to 2.5. By setting the ratio within the above range, the first dust outlet end 2312 is brought closer to the inner wall of the left end 216 of the first housing portion 212, making the structure of the dust collection device 200 more compact, while also leaving sufficient gap between the first dust outlet end 2312 and the inner wall of the left end 216, thereby ensuring that the filter assembly 230 can smoothly detach from the first housing portion 212 along with the second housing portion 213. Furthermore, a ratio of the length L1 of the first housing portion 212 in its width direction to the length L2 of the first dust outlet end 2312 of the first cyclone tube 231 to the midpoint P is greater than or equal to 2.1 and less than or equal to 2.4, which yields even better results.

[0052] The ratio of the length D1 of the second housing portion 213 in its longitudinal direction to the distance D2 from the air inlet pipe 220 to the filter assembly 230 along the first straight line 103 is greater than or equal to 1 / 3 and less than or equal to 2 / 3. By arranging the structure of the filter assembly 230, the air outlet assembly 250, and the air duct 240, the structure of the components is made more compact, thus reducing the volume occupied by the filter assembly 230 in the receiving cavity 211, thereby allowing the receiving cavity 211 to have more space for collecting dust.

[0053] like Figure 2 , Figure 5 As shown, the tool body 100a also includes a damping assembly 90 and an air guide 270. The air guide 270 is used to direct the dust-collecting airflow to the outside of the tool housing 10. The air guide 270 is mounted on the tool housing 10. The damping assembly 90 is used to prevent the base plate assembly 710 from rotating too fast under the drive of the motor 31, which could lead to excessive wear on the workpiece. The damping assembly 90 is at least partially disposed within the receiving space 121. Specifically, the damping assembly 90 is disposed between the motor 31 and the base plate assembly 710, and the damping assembly 90 elastically abuts against the base plate assembly 710.

[0054] In the vertical direction, the motor 31, the air guide 270, the damping component 90, and the base plate assembly 710 are arranged sequentially. Specifically, one end of the damping component 90 elastically abuts against the upper side of the base plate assembly 710, and the other end is connected to the air guide 270. Sandpaper and similar accessories can be installed on the lower side of the base plate assembly 710. When the motor 31 drives the base plate assembly 710 to rotate, due to the damping effect of the damping component 90 elastically abutting against the base plate assembly 710, the rotational speed of the base plate assembly 710 can be effectively reduced, and it can maintain a relatively stable operation. At the same time, the damping component 90 can also absorb the vibration that may be generated during the grinding process of the base plate assembly 710.

[0055] like Figures 10 to 13 As shown, the damping assembly 90 includes a damping element 91 disposed around the air guide 270. The damping element 91 includes a main base portion 911 and an annular ring 912. The main base portion 911 is generally formed as an annulus, which generally surrounds the air guide 270 in the circumferential direction. In the vertical direction, the main base portion 911 of the damping element 91 at least partially overlaps with the air guide 270. The annular ring 912 is used to connect to and remain relatively fixed to the air guide 270. The annular ring 912 is fixedly connected to or integrally formed with the main base portion 911; specifically, the annular ring 912 extends inwardly from the inner radial direction of the main base portion 911.

[0056] Please refer to this as well. Figures 14 to 15 The air guide 270 includes a main body 271 and a support 272. The main body 271 is annular, with its inner diameter circumferentially surrounding the dust collector fan 51. Vertically, the main body 271 at least partially overlaps the dust collector fan 51. The main body 271 is fixedly connected to the machine tool housing 10. Specifically, the outer diameter of the main body 271 has mounting holes, through which locking members fix the main body 271 to the machine tool housing 10. The main body 271 also has an outlet 130 for discharging the dust-collecting airflow outside the machine tool housing 10. The support 272 is disposed around the outer diameter of the main body 271, and is fixedly connected to or integrally formed with the main body 271. Preferably, the support 272 is integrally formed with the main body 271. In this embodiment, the annular ring 912 has a receiving groove, and the support 272 cooperates with the receiving groove, thereby fixing the air guide 270 to the damping member 91.

[0057] The damping member 91 is provided with at least two limiting portions that elastically abut against the base plate assembly 710. Specifically, the base plate assembly 710 includes a bearing seat 712 for accommodating the bearing 713. The bearing seat 712 is arranged approximately circumferentially along the output shaft 71 and is fixedly connected to the base plate 711. The damping member 91 elastically abuts against the upper side of the bearing seat 712. The limiting portions are used to limit the base plate 711 when its rotational speed is too high, and the limiting portions are approximately annular. For ease of explanation, the limiting portions are specifically defined here as a first limiting portion 913 and a second limiting portion 914, wherein the first limiting portion 913 extends along a first direction a, and the second limiting portion 914 extends along a second direction b. The first limiting portion 913 and the second limiting portion 914 are fixedly connected or integrally formed. Specifically, the first limiting part 913 and the second limiting part 914 are integrally formed with the main body part 911. In the vertical direction, the first limiting part 913 and the second limiting part 914 elastically abut against the upper side of the base plate assembly 710. In the circumferential direction, the second limiting part 914 is disposed on the outer periphery of the first limiting part 913. In other words, the cross-section of the damping member 91 along the first axis 102 includes a U-shaped cross-section, that is, a first cavity 916 is formed between the first limiting part 913 and the second limiting part 914. Among them, the first limiting part 913, the base plate assembly 710, the air guide 270 and the integrated fan form the first space 273. When the motor 31 drives the dust collecting fan 51 and the base plate assembly 710 to rotate, the sandpaper mounted on the base plate assembly 710 rotates, thus grinding the workpiece and generating a large amount of dust. At this time, the rotation of the dust collecting fan 51 generates negative pressure, which forms a dust collecting airflow, thereby drawing the dust from the lower side of the base assembly into the first space 273, and finally discharging it from the outlet 130 formed by the air guide 270. During machine operation, dust enters the first space 273, and the damping member 91 rotates relative to the base plate assembly 710. At this time, some dust inevitably comes into contact with the first limiting part 913, causing severe wear on the first limiting part 913, which in turn affects the life of the damping member 91. By providing a first limiting part 913 and a second limiting part 914 that elastically abut against the base plate assembly 710, most of the dust can be blocked by the first limiting part 913, thereby reducing the contact between the second limiting part 914 and the dust, thus reducing wear. Furthermore, the damping member 91 also includes a third limiting part 915 extending along a third direction c and abutting against the base plate assembly 710. The third limiting part 915 is fixedly connected to or integrally formed with the main base part 911. The third limiting part 915 is disposed on the outer periphery of the second limiting part 914, wherein a second cavity 917 is formed between the third limiting part 915 and the second limiting part 914. The third direction c intersects obliquely with the direction of the first axis 102. The extension directions of the first limiting part 913 and the second limiting part 914 both intersect with the extension direction of the third limiting part 915. The first direction a and the second direction b are parallel to the first axis 102.With this configuration, even if some dust enters the first cavity 916 from the first space 273, it will be stopped by the second limiting part 914, thereby greatly reducing the wear of the base plate assembly 710 on the third limiting part 915. Of course, more limiting parts can be provided.

[0058] Furthermore, grease can be stored in the first cavity 916 and the second cavity 917, which helps lubricate, reduce wear, and extend the life of the damping component 91.

[0059] When the base plate assembly 710 rotates, the first limiting part 913, the second limiting part 914, and the third limiting part 915 elastically abut against the bearing seat 712, providing the bearing seat 712 with a first stopping force, a second stopping force, and a third stopping force to limit the rotation of the base plate assembly 710. The third stopping force is greater than the second stopping force, and the second stopping force is greater than the first stopping force. This configuration ensures that the first limiting part 913 blocks most of the dust from entering the first cavity 916, and any remaining dust entering the first cavity 916 is also blocked by the second limiting part 914, significantly reducing the amount of dust entering the second cavity 917. This configuration also prevents the damping element 91 from having excessive stopping force, which could restrict the rotation of the base plate assembly 710.

[0060] like Figure 10 , Figures 14 to 15 As shown, the support 272 has at least one opening 2721 for allowing air from the second space 274 to enter the first space 273. The second space 274 refers to the space formed by the damping member 91, the air guide member 270, and the machine tool housing 10 that is in communication with the external environment. When the motor 31 drives the dust collection fan 51 to rotate, the rotation of the dust collection fan 51 generates negative pressure in the first space 273 formed by the first limiting part 913, the base plate assembly 710, the air guide 270, and the integrated fan. This generates a dust-collecting airflow that can suck away dust. The presence of negative pressure also causes the damping member 91 to be strongly pressed against the upper side of the base plate assembly 710. Because the negative pressure generated in the first space 273 increases the stopping force that the limiting part originally pressed against the upper side of the base plate assembly 710, the damping member 91 is also worn more severely. By providing an opening 2721 on the support part 272, air from the second space 274 is allowed to enter the first space 273, reducing the negative pressure in the first space 273, thereby reducing the wear of the damping member 91 and extending its service life. Furthermore, the opening 2721 can be a ring-shaped through-hole on the support part 272, or it can be several ventilation holes arranged around the support part 272.

[0061] The foregoing has shown and described the principles, main features, and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A dust collecting device suitable for a grinding tool, comprising: a dust collecting shell, which is formed with a receiving cavity for dust collection; an air inlet pipe, which is used to guide a dust collecting airflow, which flows out of the grinding tool, to enter the receiving cavity along a first straight direction; a filter assembly, which is arranged in the receiving cavity; an air duct pipe, which forms an air duct connecting the air inlet pipe and the filter assembly; an air outlet assembly, which is connected with the filter assembly and is used to guide the dust collecting airflow, which is filtered by the filter assembly, to be discharged out of the dust collecting shell; characterized in that: the filter assembly comprises: a first cyclone pipe, which extends along a second straight direction, and has a first air inlet end for air inlet and a first dust outlet end for dust outlet along the second straight direction; a second cyclone pipe, which extends along a third straight direction, and has a second air inlet end for air inlet and a second dust outlet end for dust outlet along the third straight direction; the air outlet assembly comprises: a first air outlet pipe, which is arranged at the first air inlet end of the first cyclone pipe, and which forms a connection with the first cyclone pipe, and which guides the dust collecting airflow, which is filtered by the first cyclone pipe, to be discharged out of the dust collecting shell; a second air outlet pipe, which is arranged at the second air inlet end of the second cyclone pipe, and which forms a connection with the second cyclone pipe, and which guides the dust collecting airflow, which is filtered by the second cyclone pipe, to be discharged out of the dust collecting shell; wherein the first cyclone pipe and the second cyclone pipe are arranged at two sides of the air inlet pipe, and the second straight direction and the third straight direction respectively intersect with the first straight direction, and the dust collecting device further comprises a separation part, which can separate the dust collecting airflow into two air inlet air paths, and each air inlet air path corresponds to one cyclone pipe. 2.A dust collecting device according to claim 1, characterized in that: the first air outlet pipe and the second air outlet pipe are connected in communication, and the first air outlet pipe and the second air outlet pipe are fixedly connected or integrally formed; the dust collecting shell comprises: a second shell part, which is formed with an air outlet opening in communication with the first air outlet pipe and / or the second air outlet pipe; a first shell part, which is detachably connected with the second shell part; when the second shell part is combined to the first shell part, the receiving cavity is formed by the first shell part and the second shell part, and when the first shell part is detached from the second shell part, the receiving cavity is opened to form a dust outlet opening for discharging dust in the receiving cavity. 3.A dust collecting device according to claim 2, characterized in that: the dust collecting shell has a length direction extending along the first straight direction, and the dust collecting shell comprises a front end and a rear end in the length direction, the front end is formed by the first shell part, and the rear end is formed by the second shell part; wherein the dust outlet opening is arranged on the second shell part, and the dust outlet opening is opened towards the front end, and the air outlet opening is recessed formed by the rear end. 4.A dust collecting device according to claim 3, characterized in that: The ratio of the length of the second housing part in the length direction to the distance from the air inlet pipe to the filter assembly in the first linear direction is greater than or equal to 1 / 3 and less than or equal to 2 / 3.

5. The dust collecting device according to claim 2, wherein: The air inlet pipe, the filter assembly, the air duct pipe and the air outlet assembly are fixedly connected with the first housing part, so that when the first housing part is detached from the second housing part, the air inlet pipe, the filter assembly, the air duct pipe and the air outlet assembly can be separated from the containing cavity through the dust outlet.

6. The dust collecting device according to claim 1, wherein: The second linear direction is perpendicular to the first linear direction, and the second linear direction coincides with the third linear direction.

7. The dust collecting device according to claim 1, wherein: The separation part is installed in the air inlet pipe or / and the air duct pipe, and the separation part can separate the dust collecting airflow guided by the air inlet pipe into two air inlet air paths that are symmetrical about a middle plane; The first cyclone pipe and the second cyclone pipe are symmetrically arranged about the middle plane.

8. The dust collecting device according to claim 7, wherein: The dust collecting housing has a width direction extending perpendicularly to the first linear direction, and the dust collecting housing includes a left end and a right end in the width direction, and the ratio of the length of the left end and the right end in the width direction to the length of the first dust outlet end of the first cyclone pipe to the middle plane is greater than or equal to 2 and less than or equal to 2.

5.

9. The dust collecting device according to claim 7, wherein: The air outlet assembly further includes an air outlet part in communication with the first air outlet pipe and the second air outlet pipe, the air outlet part can guide the dust collecting airflow guided by the first air outlet pipe and the second air outlet pipe to the outside of the dust collecting housing, the air outlet part extends along the first linear direction, and the air outlet part is arranged between the first cyclone pipe and the second cyclone pipe.

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