Polishing tool

Abstract

A polishing tool comprises a bottom plate assembly including a bottom plate and a polishing piece fixed on the bottom plate; a casing assembly arranged on the bottom plate and including a body casing; a driving mechanism and a fan assembly arranged in the body casing, the driving mechanism driving the bottom plate assembly to move; the casing assembly further includes a functional casing, a hollow cavity is formed in the functional casing, and an inlet and an outlet are arranged on the functional casing and communicate with the cavity, the inlet communicates with a dust collection channel of the polishing tool, the outlet is configured to discharge gas in the cavity, and the fan assembly is used to form a dust removal air path moving towards the inlet; the functional casing is arranged on one side of the body casing and its projection to the plane where the bottom plate assembly is located is located in the bottom plate; the projection area of the functional casing to the bottom plate is greater than or equal to 15% and less than or equal to 95% of the area of the bottom plate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric power tools, in particular to a polishing tool. BACKGROUND

[0002] The polishing tool is a commonly used electric power tool, which realizes polishing on the surface of wood, plastic, stone, metal and other materials through the swing of the bottom plate. The handheld polishing tool should also have a small size and weight to meet the user's expectation of convenient operation and use experience on the basis of meeting the polishing function. However, the work of the polishing tool usually generates a lot of dust, in order to avoid the environmental pollution and the impact on the user's health caused by the dust, the existing polishing tools are mostly provided with a dust collecting device for collecting the dust generated in the polishing process.

[0003] The dust collecting device in the prior art is mostly an external dust collecting box or bag, which is connected with the dust outlet on the main machine through a pipeline or directly, and a small part of the dust collecting boxes can be directly connected to the main machine. However, the existing dust collecting device mostly has an additional part matched with the main machine, so that the structure of the main machine is heavy and large in size after being connected with the dust collecting device, and even the self-weight of the dust collecting device affects the stability of the gravity center of the main machine after collecting the dust, resulting in the deflection during operation and the inconvenience of user operation. SUMMARY

[0004] In order to solve the problems in the prior art, the present application aims to provide a polishing tool which meets the dust collecting function and is convenient for user to operate flexibly.

[0005] In order to achieve the above-mentioned target, the present application adopts the following technical scheme:

[0006] A polishing tool, comprising:

[0007] A bottom plate assembly comprising a bottom plate and a polishing piece fixed on the bottom plate;

[0008] A machine shell assembly arranged on the bottom plate, comprising a machine body shell;

[0009] A driving mechanism and a fan assembly arranged in the machine body shell, the driving mechanism drives the bottom plate assembly to move;

[0010] The machine shell assembly further comprises a functional shell, a hollow cavity is formed in the functional shell, and an inlet and an outlet are arranged on the functional shell and communicate with the cavity, the inlet communicates with a dust suction channel of the polishing tool, the outlet is configured to discharge the gas in the cavity, and the fan assembly is used to form a dust discharge air path moving towards the inlet;

[0011] The functional machine shell is arranged on one side of the machine body shell, and the projection of the functional machine shell to the plane where the bottom plate assembly is located is located in the bottom plate; the area ratio of the projection of the functional machine shell to the bottom plate to the area of the bottom plate is greater than or equal to 15% and less than or equal to 95%.

[0012] Further, the area ratio of the projection of the functional machine shell to the bottom plate to the area of the bottom plate is greater than or equal to 50% and less than or equal to 95%.

[0013] Further, the axial height of the functional machine shell is greater than or equal to 30% and less than or equal to 85%.

[0014] Further, the functional machine shell includes an auxiliary holding part, which is located at the top end of the functional machine shell; the auxiliary holding part is a recess inwardly recessed on the functional machine shell.

[0015] Further, the functional machine shell is snap-connected with the machine body shell, and the functional machine shell further comprises an auxiliary fixing part matched with the bottom plate.

[0016] Further, the functional machine shell comprises an outer shell, which is arranged on the periphery of the machine body shell and cooperates with the machine body shell to form the cavity.

[0017] Further, the functional machine shell comprises an outer shell and an inner shell, the outer shell is arranged outside the inner shell and forms the cavity with the inner shell, and the inner machine shell is arranged outside the machine body shell.

[0018] An opening is formed between the outer shell and the inner shell, and the functional machine shell further comprises a cover plate which covers the opening.

[0019] Further, a filter support accommodating a filter is arranged in the functional machine shell, and the filter is arranged on the moving path of the air duct.

[0020] Further, a dust removal assembly is further included, which is arranged between the bottom plate assembly and the functional machine shell, and the dust removal assembly forms the dust suction channel.

[0021] Further, the dust removal assembly comprises:

[0022] A bus bar is arranged on the bus bar, and the bus bar is arranged on the bottom plate assembly and communicates with the dust suction port on the bottom plate assembly;

[0023] and a conveying support which communicates with the dust inlet of the bus bar, and the conveying support is provided with a dust outlet which is connected with the inlet.

[0024] The polishing tool of the present application, by reserving part of the position in the main machine shell for accommodating dust, does not need to additionally set up a dust suction assembly, through reserving part of the position in the main machine shell for accommodating dust, meets the dust suction and dust collection function, avoids the operation deflection caused by the too large volume of the dust suction container, improves the operation flexibility, and improves the user's use experience. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural schematic diagram of the polishing tool of the present application;

[0026] Figure 2 is Figure 1 the assembly schematic diagram of the polishing tool shown in the figure;

[0027] Figure 3 is Figure 1 the assembly schematic diagram of the functional machine shell shown in the figure;

[0028] Figure 4 is Figure 3 the structural schematic diagram of the functional machine shell shown in the figure;

[0029] Figure 5 is Figure 3 the structural schematic diagram of the functional machine shell from another angle shown in the figure;

[0030] Figure 6 is Figure 1 the structural schematic diagram of the polishing tool after removing the functional machine shell shown in the figure;

[0031] Figure 7 is Figure 6 the structural schematic diagram of the polishing tool machine shell after opening shown in the figure;

[0032] Figure 8 is the assembly schematic diagram of the dust removal assembly and the bottom plate assembly of the present application;

[0033] Figure 9 is the assembly diagram of the bottom plate assembly and the motor output shaft of the present application;

[0034] Figure 10 is Figure 9 the A-A sectional view shown in the figure;

[0035] Figure 11 is Figure 10 the center of mass migration schematic diagram shown in the figure;

[0036] Figure 12 is the assembly schematic diagram of the support frame and the bottom plate assembly of the present application;

[0037] Figure 13 is the support frame structural schematic diagram of an embodiment of the present application;

[0038] Figure 14 is Figure 13 a top view of the support frame shown in

[0039] Figure 15 is Figure 14 the B-B sectional view shown in

[0040] Figure 16 is a schematic view of a support frame structure according to another embodiment of the present application;

[0041] Figure 17 is Figure 16 a front view of the support frame shown in

[0042] Explanation of Reference Numerals:

[0043] 100 - polishing tool

[0044] 200 - base plate assembly; 210 - base plate; 211 - initial center of mass line; 212 - corrected center of mass line

[0045] 300 - machine housing assembly

[0046] 310 - machine body housing; 311 - grip portion; 312 - main machine barrel; 3121 - clamping slot; 3122 - motor cavity; 3123 - air duct cavity; 3124 - air duct cavity outlet; 313 - base; 3131 - boss

[0047] 320 - functional machine housing; 321 - cavity; 3211 - outer shell; 3212 - inner shell; 322 - inlet; 323 - outlet; 324 - auxiliary grip portion; 325 - opening; 326 - end cap; 327 - filter support; 328 - auxiliary fixing member; 329 - clasp

[0048] 330 - filter

[0049] 400 - drive mechanism

[0050] 410 - output shaft; 411 - motor axis

[0051] 420 - support member; 421 - support rotation axis

[0052] 430 - center of mass migration member

[0053] 510 - switch assembly; 520 - control mechanism

[0054] 600 - dust removal assembly; 610 - busbar; 611 - dust inlet; 620 - conveying support; 621 - dust outlet

[0055] 700 - support frame; 710 - support base; 711 - first through hole; 720 - mounting base; 721 - second through hole; 730 - central release; 740 - floating connecting arm; 741 - first radially extending section; 742 - axially extending section; 743 - second radially extending section; 750 - floating support arm; 760 - screw hole;

[0056] 800 - fan assembly. DETAILED DESCRIPTION

[0057] The application will be described in detail below with reference to the drawings.

[0058] As Figure 1 shown, the polishing tool 100 according to an embodiment of the application is a sanding machine, more specifically a flat plate sanding machine that can be held and operated by a user with one hand or two hands. It can be understood that the polishing tool 100 can be a round sanding machine, a triangular sanding machine, a square sanding machine, an irregularly shaped sanding machine, etc., as long as it is a polishing tool that can be used in the technical solution of the application and is within the protection scope of the application.

[0059] The polishing tool 100 according to the embodiment of the application includes a bottom plate assembly 200, a machine shell assembly 300, a driving mechanism 400, a fan assembly, a dust removal assembly, and a power supply. As Figure 2 shown, the machine shell assembly includes a machine body shell 310 and a functional shell 320, and the driving mechanism 400 and the fan assembly are both arranged in the machine body shell 310. The power supply can be a direct current power supply, such as a battery pack, or an alternating current power supply.

[0060] Referring to the accompanying Figure 1 and Figure 12 , the bottom plate assembly 200 includes a bottom plate 210 and a polishing element (not shown in the figure) fixed to the bottom plate 210, and the bottom plate 210 is provided with a polishing element on the side away from the machine shell assembly. The polishing element can be sandpaper or other types of abrasive or polishing elements, and the polishing element can be removably attached to the bottom plate in a conventional manner, such as a hook and loop fastener and / or a clamping retainer (not shown). The bottom plate 210 is provided with a bottom plate dust suction port for sucking in the dust generated during operation.

[0061] The driving mechanism 400 is arranged to drive the movement of the bottom plate assembly 200, as Figure 7As shown, the drive mechanism 400 includes a motor and an output shaft 410 connected to the motor. A fan assembly 800 is mounted on the output shaft 410 and driven to rotate by the output shaft 410. One end of the output shaft 410 is connected to the motor, and the other end is connected to the base plate assembly 200. Both the drive mechanism 400 and the fan assembly 800 are housed within the chassis 310. It should be noted that the drive mechanism 400 may also include a transmission assembly disposed between the motor shaft and the output shaft. This transmission assembly can be any suitable transmission mechanism, such as gear transmission, belt transmission, etc., which will not be elaborated upon here. Figure 10 As shown, a support member 420 is also connected to the end of the motor output shaft 410. In this embodiment of the invention, the support member 420 is an eccentric bearing. The eccentric bearing is installed in the base plate assembly 200. The motor rotates around the motor axis 411, which drives the eccentric bearing to rotate, thereby driving the base plate 210 to make eccentric movements on the workpiece surface. At the same time, in order to balance the vibration during the eccentric movement, the grinding tool in this embodiment of the invention is also provided with a counterweight, which can be set on the fan or on the base plate.

[0062] like Figure 10 As shown, in this embodiment of the invention, the support member 420 rotates around the support rotation axis 421, wherein the support rotation axis 421 is arranged parallel to and spaced apart from the motor axis 411. Figure 11 As shown, the base plate 210 in this embodiment of the invention has an initial centroid line 211 that passes perpendicularly to its initial center of mass, wherein the initial centroid line 211 refers to the centroid line of the base plate when no centroid transfer member is provided.

[0063] In this embodiment of the invention, the support member 420 is moved backward on the base plate 210 (the backward movement points to...). Figure 10 and Figure 11 The right-side movement of the housing 310 is adjusted so that the drive mechanism 400 (including the motor, fan, etc.) connected to it is moved backward, thus reducing the space occupied by the housing 310 on the base plate 210. Figure 10 More space is reserved on the left side of the base plate, which in other words, more space is reserved for the functional housing 320, thereby increasing the volume of the functional housing 320. Therefore, in this embodiment of the invention, the support rotation axis 421 is offset relative to the initial center of mass 211, that is, the rotation axis 421 does not pass through the initial center of mass of the base plate 210.

[0064] Therefore, as Figures 9-12As shown, the grinding tool in this embodiment of the invention also includes a center-of-gravity shifter 430. The center-of-gravity shifter 430 is disposed on the rear side of the base plate 210 to shift the center of gravity of the base plate 210 to the position of the corrected center-of-gravity line 212. The corrected center-of-gravity line 212 coincides with the support rotation axis 421. The corrected center-of-gravity line 212 is farther away from the functional housing 320 than the initial center-of-gravity line 211. In other words, the center-of-gravity shifter 430 is configured to shift the center of gravity of the base plate 210 to the side away from the functional housing 320 and to coincide with the support rotation axis 421. This avoids problems such as uneven movement, jumping, and vibration of the base plate during the use of the grinding tool.

[0065] In this embodiment of the invention, the supporting rotation axis 421 is positioned further away from the functional housing 320 relative to the initial centroid line 211, that is, the supporting rotation axis 421 of the present invention is positioned rearward relative to the initial centroid line 211 (e.g. Figure 11 The right side (shown in the middle) is the rear side. (For example...) Figure 11 As shown, the distance between the corrected centroid line 212 and the initial centroid line 211 is greater than or equal to 5mm and less than or equal to 35mm. That is, the support rotation axis 421 is moved back 5mm to 35mm relative to the initial centroid line 211. In this embodiment of the invention, the centroid line of the base plate is moved back 7mm to the position of the corrected centroid line 212 by setting the centroid transfer member 430. Of course, it can also be moved back 10mm, 15mm or 20mm. The corrected centroid line refers to the centroid line of the base plate after the centroid transfer member 430 is set on the base plate.

[0066] like Figure 12 As shown, in this embodiment of the invention, the center of gravity transfer member 430 is disposed in the base plate 210. A mounting groove is provided on the base plate 210, and the center of gravity transfer member 430 is snapped into the mounting groove, thereby preventing the center of gravity transfer member from protruding from the base plate. The center of gravity transfer member 430 can be a metal part or a non-metal part; no limitation is made here. Alternatively, the mounting groove for mounting the center of gravity transfer member 430 may not be provided on the base plate 210, and the center of gravity transfer member 430 may be directly bonded and fixed to the base plate 210.

[0067] This invention increases the volume of the functional housing by moving the support and drive mechanism backward on the base plate as a whole. At the same time, by setting a center of gravity shifting component to compensate for the misalignment between the support rotation axis and the center of gravity line of the base plate, it ensures that the corrected center of gravity line of the base plate after correction coincides with the support rotation axis, so that the base plate is supported on its center of gravity and moves, ensuring uniform movement of the base plate and avoiding problems such as base plate jumping and vibration.

[0068] like Figure 2 As shown, the housing assembly 300 of the present invention includes a body housing 310 and a functional housing 320, wherein the functional housing 320 is connected to the base plate assembly 200 and / or the body housing 310. Wherein...Figure 1 As shown, the projection of the functional housing 320 onto the plane of the base plate assembly 200 is substantially located within the base plate 210.

[0069] By placing the projection of the functional housing 320 on the base plate assembly 200 within the base plate 210, the overall appearance of the device can be further avoided due to the excessive size of the functional housing 320, as well as the inconvenience to user operation caused by its excessive size. This allows the functional housing to be better integrated into the overall casing, ensuring the harmony of the appearance while improving the user's operating experience.

[0070] As shown in Figure 2 and Figure 6 As shown, the body housing 310 in this embodiment of the invention includes a gripping part 311, a main body cylinder 312 and a base 313 that are interconnected. Of course, the body housing 310 can be formed separately and then assembled into one piece.

[0071] like Figure 6 As shown, the grip portion 311 is located on the top of the housing 310, and the grip portion 311 is used for the user to hold during operation. To facilitate user gripping, as... Figure 4 As shown, the functional housing 320 in this embodiment of the invention also includes an auxiliary grip portion 324, wherein the auxiliary grip portion 324 is a recess formed at the top of the functional housing 320 and recessed inward therein, and the auxiliary grip portion 311 is recessed within the grip portion to provide space for the user's fingers to grip when holding it.

[0072] See appendix Figure 2 and attached Figure 6 The base 313 is located at the bottom of the housing 310 and covers the base plate assembly 200. The main unit 312 is located between the grip 311 and the base 313. The main unit 312 includes a motor chamber 3122 and an air duct chamber 3123, which are connected. The outer periphery of the motor chamber 3122 is cylindrical, and the motor chamber 3122 protrudes from the air duct chamber 3123. The motor chamber 3122 houses a motor and fan assembly, while the air duct chamber 3123 houses air duct components. The air duct chamber 3123 has an air duct chamber outlet 3124 that connects to the inlet 322 of the functional housing 320.

[0073] like Figure 7 As shown, the grinding tool 100 in this embodiment of the invention further includes a switch assembly 510 and a control mechanism 520. The control mechanism 520 is used to control the rotation of the motor. The control mechanism 520 includes a PCBA assembly, on which capacitors, inductors, and other related components are disposed. The control unit is connected to the switch assembly and the power supply. The motor can be switched on and off by operating the switch assembly 510. The switch assembly 510 is disposed at the front end of the gripping part 311 (i.e., Figure 7The control mechanism 520 is vertically installed in the air duct chamber 3123 of the main unit cylinder 312 (at the left end of the cylinder), or it can be installed in the grip part 311.

[0074] In this embodiment, see Appendix Figure 3 -Appendix Figure 5 The functional housing 320 is disposed on one side of the body housing 310; a hollow cavity 321 is formed inside the functional housing 320, and the functional housing 320 is provided with an inlet 322 and an outlet 323 communicating with the cavity 321. The inlet 322 is connected to the dust exhaust channel in the body housing 310, and the outlet 323 is configured to exhaust the dust exhaust airflow in the cavity 321. The fan assembly is used to form an air path moving from the bottom plate dust suction port to the inlet 322.

[0075] Specifically, in this embodiment, the ratio of the projected area of ​​the functional housing 320 to the base plate to the area of ​​the base plate is greater than or equal to 15% and less than or equal to 95%. In this embodiment, the ratio of the projected area of ​​the functional housing 320 to the base plate to the area of ​​the base plate is approximately 70%. Of course, the ratio of the projected area of ​​the functional housing 600 to the base plate to the area of ​​the base plate can also be set to 60%, 50%, or 40%.

[0076] The axial height of the functional housing 320 of this invention is greater than or equal to 15mm and less than or equal to 125mm, preferably 25mm to 70mm. Simultaneously, the ratio of the axial height of the functional housing 320 to the axial height of the entire machine is greater than or equal to 30% and less than or equal to 85%. In this embodiment, the ratio of the axial height of the functional housing 320 to the axial height of the entire machine is approximately 50%. Of course, the ratio of the axial height of the functional housing 320 to the axial height of the entire machine can also be set to 60% or 70%, where axial height refers to the height perpendicular to the base plate.

[0077] Through the above reasonable layout and design, the capacity of the functional housing 320 can be further increased. This ensures that the overall structure of the grinding tool is compact and the size is small, while also ensuring the capacity of the functional housing 320. This avoids frequent dust emptying due to insufficient capacity and improves the user experience.

[0078] like Figure 4 As shown, in this embodiment of the invention, the functional housing 320 cooperates with the main unit cylinder 312. Since the motor chamber 3121 of the main unit cylinder 312 protrudes, the corresponding functional housing 320 is provided with a notch. That is, the functional housing 320 in this embodiment of the invention is a U-shaped housing.

[0079] See Figures 3-5, the functional machine shell 320 comprises an opening 325 arranged at the bottom of the functional machine shell 320, and an end cover 326 arranged at the opening 325, wherein the periphery of the end cover 326 is provided with a groove, and the shell at the opening of the functional machine shell 320 can be clamped into the groove, thereby achieving cooperation and fixation with the end cover 326. By arranging the end cover 326, it is convenient for the user to pour dust.

[0080] As shown in Figure 3 , a filter 330 is further arranged in the functional machine shell 320, and the filter 330 is arranged between the inlet 322 and the outlet 323. The filter 330 in the embodiment is a folding filter paper, which can be arranged in the functional machine shell 320 and cover the outlet 323, so as to prevent dust from flying out of the outlet 323 with the airflow and causing air pollution. The airflow carrying dust enters the cavity 321 through the inlet 322, and the dust is collected in the functional machine shell 320 after being filtered by the filter 330, and the filtered airflow is discharged from the functional machine shell 320 through the outlet 323.

[0081] In order to facilitate the installation and replacement of the filter 330, a filter support 327 for installing the filter 330 is further arranged in the embodiment, and a limiting piece corresponding to the filter support 327 is arranged in the functional machine shell 320. Specifically, the filter support 327 comprises a support seat and a blocking arm, wherein the support seat is provided with a hollow opening allowing the dust removal airflow to enter the filter, which on the one hand enables the dust removal airflow to smoothly enter the filter 330, and on the other hand facilitates the user to smoothly remove the filter support 327 through the hollow opening. The blocking arm is arranged around the filter 330 to support and shape the filter 330, and the end arm of the filter support 327 abuts against the inner wall of the upper shell of the functional machine shell 320, thereby achieving upper limiting of the filter support 327. The limiting piece can be a rib plate arranged on the inner wall of the functional machine shell 320, wherein the rib plate is clamped with the support seat of the filter support 327 and limits the support seat from below, thereby fixing and supporting the filter support 327 in the functional machine shell 320.

[0082] During installation, the filter 330 is clamped in the filter support 327, and then the filter support 327 together with the filter 330 is inserted into the top of the functional machine shell 320 from the opening 325 at the lower end of the functional machine shell 320, and is clamped with the limiting piece in the functional machine shell 320. During disassembly, the filter support 327 is pulled out downward and taken out through the opening 325 of the functional machine shell 320.

[0083] In this embodiment, referring to Figures 3-5 , the functional machine shell 320 is clamped with the machine body shell 310, wherein a pair of buckles 329 are arranged at the top rear end (the rear end refers to the end connected with the machine body shell) of the functional machine shell 320, and as shown in Figure 6As shown, a pair of slots 3121 are provided on the upper part of the air duct chamber 3123 of the main body cylinder 312 on the housing 310, and the buckle 329 of the functional housing 320 is adapted to be inserted into the slots 3121.

[0084] In embodiments of the present invention, such as Figures 5-6 As shown, an auxiliary fixing component is also provided at the bottom of the functional housing 320, that is, an auxiliary fixing component 328 is also provided outside the end cover 326 of the functional housing 320. Specifically, as shown... Figure 5 As shown, the auxiliary fixing member 328 is a groove provided on the end cap 326, wherein, as Figure 6 As shown, a corresponding boss 3131 is provided on the base 313 of the fuselage 310.

[0085] During assembly, the functional housing 320 is inserted into the body housing 310 from one side, and a pair of clips 329 of the functional housing 320 are inserted into the slots 3121. At the same time, the protrusion 3131 on the base 313 is engaged in the groove of the end cover 326. This makes the fit between the functional housing 320 and the body housing 310 more secure.

[0086] See also Figure 4 and Figure 5 The functional housing 320 of the present invention includes an outer shell 3211 and an inner shell 3212 integrally formed, wherein the inner shell 3212 surrounds the motor chamber 3122 of the main body cylinder 313, and the outer shell 3211 and the inner shell together form a cavity 321.

[0087] Of course, as an alternative implementation, the inner shell 3212 and the end cap may not be provided. The outer shell 3211 is directly surrounded on the outside of the motor chamber 3122 of the main body cylinder 312 and forms a cavity 321 with the outer wall of the motor chamber 3122. In this case, the opening of the outer shell 3211 and the motor chamber 3122 can be configured as either an inlet 322 or a pouring port.

[0088] In this embodiment, the functional housing 320 is... Figure 5 The hollow structure shown is configured as a dust collection cavity 321. An inlet 322 and an outlet 323 are provided on the functional housing 320, and both inlet 322 and outlet 323 are connected to the cavity 321. Inlet 322 is located at the rear end of the functional housing 320, and outlet 323 is located on the outer side of the outer casing 3211 of the functional housing 320, corresponding to the filter element.

[0089] The dust discharging assembly 600 in the embodiment of the present application is arranged in the machine body shell 310, and is arranged between the bottom plate assembly 200 and the functional shell 320. A channel is formed in the dust discharging assembly 600 to guide the airflow from the dust suction port of the bottom plate assembly 200 into the functional shell 320.

[0090] Specifically referring to the drawings Figure 8 The dust discharging assembly 600 comprises a busbar 610 and a conveying bracket 620. The busbar 610 is provided with a dust inlet 611, and is arranged on the bottom plate assembly 200 and communicates with the dust suction port on the bottom plate assembly 200. The conveying bracket 620 communicates with the dust inlet 611 of the busbar 610, and is provided with a dust outlet 621. The dust outlet 621 is connected with the inlet 322 of the functional shell 320. The busbar 610 can be integrally formed with the conveying bracket 620, or can be formed separately and then assembled. The dust discharging assembly 600 can be made of metal or plastic, and is not limited in this regard.

[0091] As shown in Figure 8 , the busbar 610 is an annular disc, which is arranged on the bottom plate assembly 200. A through hole is formed in the center of the busbar 610, and the dust suction port on the bottom plate assembly 200 communicates with the through hole. In addition, the eccentric bearing and the fan assembly are arranged on the bottom plate assembly 200 through the through hole. The conveying bracket 620 is arranged in the vertical direction. The conveying bracket 620 comprises at least one dust outlet 621. The conveying bracket 620 is arranged in the air duct chamber 3123 of the main barrel 312. An air duct chamber outlet 3124 corresponding to the dust outlet 621 of the conveying bracket 620 is arranged on the outer wall of the air duct chamber 3123. The air duct chamber outlet 3124 is arranged on the lower side of the clamping groove 3121. The dust outlet 621 communicates with the inlet 322 of the functional shell 320 through the air duct chamber outlet 3124.

[0092] As shown in Figure 8 , the conveying bracket 620 can be a tubular bracket. A channel is formed in the tubular bracket, and the channel is connected with the dust inlet 611 of the busbar 610. The dust outlet 621 is arranged at the upper end of the channel. The lower end of the channel is arranged close to the bottom plate assembly 200.

[0093] The fan assembly 800 is connected with the driving mechanism 400, which rotates under the driving of the motor, the fan rotates and forms a negative pressure state in the main machine shell 310, the dust generated during polishing is sucked into the bottom plate assembly 200, and the dust is driven by the rotating airflow generated by the fan rotation, enters the functional machine shell 320 through the dust removal assembly 600, and finally is discharged from the outlet 323 after being filtered by the filter in the functional machine shell 320, and the dust is left in the functional machine shell 320.

[0094] The polishing tool of the present application simplifies the structure of the whole machine by providing the cavity 321 for collecting dust in the machine shell assembly, without the need for additional connection of a dust collection bag or a dust collection device, so that the collection of dust can be realized, the operation mode is simplified, the user's use experience is improved, and the appearance is beautiful; at the same time, the functional shell 320 and the machine shell 310 together form the main machine shell, so that the functional shell 320 is integrated into the main machine shell, the appearance is beautiful, the appearance of the main machine is changed due to the dust collection requirement, the original function is not affected, and the dust collection function is also met; at the same time, the machine shell assembly itself is provided with a cavity, so that the main machine is not inconvenient to operate due to the installation or connection of a large-volume dust collection container.

[0095] As shown in Figures 13-15 , the main machine shell 310 in the embodiment also has a support frame 700, one end of the support frame 700 is connected to the main machine shell 310, and the other end is connected to the bottom plate assembly 200. Figure 7 and Figure 12 , one end of the support frame 700 in the embodiment of the present application is mounted on the bottom plate assembly 200, and the other end abuts against the base 313 of the main machine shell 310, which is used to support and connect the machine shell 310 and reduce the vibration of the tool; at the same time, the support frame 700 resists the torsion from the bottom plate assembly 200 relative to the machine shell 310, thereby reducing the swing of the tool. The bottom plate in the embodiment is a triangular shape, so three support frames 700 are respectively mounted at the three top corners. Of course, the number of vibration supports is not limited to three, for example, when the bottom plate is circular or square, two or four supports can also be provided.

[0096] Referring to the accompanying Figures 13-15 , the support frame 700 includes a support seat 710, a mounting seat 720, a center release 730, and a floating arm, wherein the upper end of the support seat 710 abuts against the machine shell, the mounting seat 720 is connected and fixed with the bottom plate 210, the mounting seat 720 is arranged axially spaced apart from the support seat 710, and the floating arm is directly or indirectly connected with the support seat 710 and the mounting seat 720.

[0097] The mounting space is provided with the mounting support frame 700 on the bottom plate 210, the mounting seat 720 is fixedly arranged in the mounting space of the bottom plate 210, the top of the support seat 710 abuts against the bottom of the bottom base 313 of the fuselage shell 310, and the two sides of the mounting seat 720 are provided with screw holes 760 which are fixedly connected to the bottom plate 210 through screws. Of course, the fixed connection mode is not limited to the screw connection, and can be, for example, a clamping connection, a plug-in connection or the like. The fixed connection mode of the mounting seat and the bottom plate is not limited herein.

[0098] The support frame 700 of the embodiment of the application further comprises a center release member 730 which is directly or indirectly fixedly connected to the support seat 710. In the embodiment, the center release member 730 is connected to the support seat 710 or the mounting seat 720 through a floating arm.

[0099] The support frame 700 of the embodiment of the application further comprises a clearance which comprises a first through hole 711 arranged on the support seat 710 and a second through hole 721 arranged on the mounting seat 720. The second through hole 721 has a parallel axis with the first through hole 711 or is coaxially arranged with the first through hole 711. The clearance provides space for the movement of the center release member 730 and the floating arm. Of course, the clearance can not be arranged, and in this case, the floating arm and the center release member are arranged between the axial end faces of the mounting seat 720 and the support seat 710.

[0100] The floating arm allows the support seat 710 and the center release member 730 to move relative to each other when the support frame 700 is subjected to an axial and / or radial force. In other words, the floating arm also allows the support seat 710 and the mounting seat 720 to move relative to each other when the support frame 700 is subjected to an axial and / or radial force. Thus, the support frame 700 can withstand the axial and radial forces by realizing the torsion of the bottom plate 210 relative to the fuselage.

[0101] The floating arm in the embodiment comprises a floating connecting arm 740 and a floating supporting arm 750. The floating connecting arm 740 connects the center release member 730 and the support seat 710, and the floating supporting arm 750 connects the center release member 730 and the mounting seat 720.

[0102] The center release member 730 is a column which extends along the axial direction of the first through hole 711 and the second through hole 721. It can be understood that the center release member 730 is arranged in the space in which the first through hole 711 and the second through hole 721 extend vertically, approximately vertically. Of course, the center release member 730 can also be arranged obliquely to the axis of the first through hole 711 or the second through hole 721.

[0103] The center release member 730 in the embodiment of the present application is connected to the support base 710 through the floating connecting arm 740, and is connected to the mounting base 720 through the floating support arm 750. The center release member 730 is connected to the mounting base 720 through the floating support arm 750, thereby achieving indirect fixation of the center release member 730 relative to the bottom plate 210. Meanwhile, the center release member 730 is bently connected to the support base 710 through the floating connecting arm 740, thereby achieving indirect connection of the support base 710 and the mounting base 720, so that the support frame 700 is configured as a floating structure with a fixed lower end and a floatingly connected upper end.

[0104] By configuring the support frame 700 as the floating structure as described above, on the one hand, the support frame 700 can bear axial force of the machine body shell 310 relative to the bottom plate assembly 200, so as to eliminate or reduce axial vibration of the whole machine, and on the other hand, the support frame 700 can bear radial force generated when the bottom plate assembly 200 rotates relative to the machine body shell 310, so as to reduce swing of the whole machine, thereby comprehensively reducing vibration and swing of the whole machine, and further improving user's use feeling.

[0105] In the embodiment of the present application, the floating connecting arm 740 is connected to the lower end of the column of the center release member 730 and the support base 710, and the floating support arm 750 is connected to the upper end of the column of the center release member 730 and the mounting base 720. Specifically, as shown in Figure 14 and Figure 15 one end of the floating connecting arm 740 in the embodiment is connected to the inner edge of the first through hole 711 of the support base 710, and the other end is connected to the lower end of the center release member 730; one end of the floating support arm 750 is connected to the inner edge of the second through hole 721, and the other end is connected to the upper end of the center release member 730.

[0106] The floating connecting arm 740 in the embodiment includes a plurality of bent segments extending radially to the center of the first through hole, and the floating support arm 750 also includes a plurality of bent segments extending radially to the center of the first through hole.

[0107] Referring to the accompanying drawings, Figure 15For example, the floating connecting arm 740 includes a first radial extension segment 741, a second radial extension segment 743, and an axial extension segment 742. The first radial extension segment 741 extends along the radial direction of the first through hole 711, the axial extension segment 742 extends along the axial direction of the first through hole 711, and the axial extension segment 742 connects the first radial extension segment 741 and the second radial extension segment 743. Specifically, the first radial extension segment 741 is connected to the inner edge of the first through hole 711, the axial extension segment 742 is connected between the first radial extension segment 741 and the second radial extension segment 743, and the second radial extension segment 742 is connected to the lower end of the center release member 730. The transition connection between the first radial extension segment 741, the second radial extension segment 743, and the axial extension segment 742 can be a smooth bending arc segment.

[0108] The floating support arm 750 and the floating connecting arm 740 have substantially the same structure, and the difference lies only in the connection positions of the two ends, which will not be described herein.

[0109] Specifically, the floating connecting arm 740 and the floating support arm 750 are each provided with three arms, and the floating connecting arm 740 and the floating support arm 750 are staggered and spaced. That is, one floating connecting arm 740 is spaced apart from one floating support arm 750. Of course, the number of the floating connecting arm 740 and the floating support arm 750 is not limited to three.

[0110] Of course, as an alternative embodiment, the floating connecting arm and / or the floating support arm can include a plurality of overlapping segments overlapping along the radial direction of the first through hole 711, or the floating connecting arm and / or the floating support arm can include a plurality of extension segments extending along the radial direction of the first through hole 711. This is advantageous to improve the deformation path of the floating connecting arm and the floating support arm, thereby improving the anti-shock and anti-swing effect.

[0111] Of course, as an alternative embodiment, the floating connecting arm 740 and the floating support arm 750 can also be directly connected to the straight arms between the center release member and the mounting seat, and between the center release member and the support seat, i.e., without including a bending segment.

[0112] By arranging the floating connecting arm 740 and the floating support arm 750 connected between the mounting seat 720 and the support seat 710, the axial distance between the mounting seat 720 and the support seat 710 is reduced without reducing the effective deformation path, so that the axial stiffness and the radial stiffness of the support frame 700 are not reduced on the basis of realizing the height reduction of the support frame 700, thereby ensuring the anti-shock and anti-torsion of the entire machine.

[0113] At the same time, the overall height is reduced, and the overall size is further reduced, which is conducive to the compactness and miniaturization of the machine. The lower height also lowers the center of gravity of the machine, which is more conducive to improving the user's sense of operation and making it easier and more convenient for the user to operate.

[0114] In this embodiment, the axial height of the support frame 700 is H, where 6mm ≤ H ≤ 20mm. In this embodiment, the axial height H of the support frame 700 is approximately 15mm.

[0115] The axial stiffness of the support frame 700 is K1, and the radial stiffness is K2. Axial stiffness K1 refers to the support frame 700's ability to resist elastic deformation when subjected to axial force, and radial stiffness K2 refers to the support frame 700's ability to resist elastic deformation when subjected to radial force. In this embodiment of the invention, 20 N / mm ≤ K1 ≤ 500 N / mm, for example, it can be set to 80~300 N / mm, or 100~130 N / mm; 5 N / mm ≤ K2 ≤ 30 N / mm, preferably 6~15 N / mm. Therefore, 0.67 ≤ K1 / K2 ≤ 100, preferably 5.3 ≤ K1 / K2 ≤ 50.

[0116] If we define the unit axial stiffness as K, where K is the ratio of the axial stiffness K1 of the support frame 700 to the axial height H of the support frame 700, i.e., K=K1 / H, then 1 N / mm²≤K≤83.3 N / mm², where K is preferably 5.3N / mm²≤K≤25 N / mm².

[0117] The support frame 700 in this embodiment of the invention is an integrally molded part, specifically an integrally molded plastic part.

[0118] like Figures 16-17 As shown, another embodiment of the support frame is presented. In this embodiment, the support frame 700' does not have a mounting base and a floating support arm. In this embodiment, the support frame 700' includes a support base 710', a central release member 730', and a floating connecting arm 740', wherein the central release member 730' is connected to the support base 710' via the floating connecting arm 740'. The clearance portion includes a first through hole 711' provided on the support base 710', and the clearance portion provides space for the movement of the central release member 730' and the floating connecting arm 740'.

[0119] In this embodiment, the central release member 730' is directly connected to the base plate assembly 200. Specifically, a screw hole 760' is provided in the central release member 730', wherein the screw hole 760' is arranged approximately along the axial direction of the first through hole 711', and the central release member 730' is fixedly connected to the base plate 210 by screws.

[0120] In this embodiment, the floating connecting arm 740' is also a curved arm, and the arm length of the floating connecting arm 740' is greater than the axial height of the support base 710', wherein the floating connecting arm 740' can comprise a plurality of axially overlapping segments along the axial direction of the central release member, and / or a plurality of radially overlapping segments along the radial direction of the central release member. The floating connecting arm 740' in this embodiment comprises axially overlapping segments along the first through hole 711'.

[0121] In other words, in this embodiment, the floating connecting arm 740' also comprises a plurality of radially extending segments and axially extending segments, which are connected to form a curved floating connecting arm 740', wherein the radially extending segments can overlap in the radial direction, and the axially extending segments can also overlap in the axial direction. Of course, the radially overlapping segments and the axially overlapping segments can also not be included, as long as the floating connecting arm 740' is curvedly connected between the central release member 730' and the support base 710'.

[0122] Of course, as an alternative embodiment, the support base 710' can also not be provided with a relief portion, and in this case, the central release member and the floating connecting arm are arranged at the bottom of the support base 710'.

[0123] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the above embodiments do not limit the present application in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the protection scope of the present application.

Claims

1. A polishing tool, comprising: a base plate assembly comprising a base plate and a polishing element fixed on the base plate; a machine housing assembly arranged on the base plate, comprising a machine body housing; a driving mechanism and a fan assembly arranged in the machine body housing, the driving mechanism driving the base plate assembly to move; characterized in that: the machine housing assembly further comprises a functional housing, the functional housing forms a hollow cavity therein, and is provided with an inlet and an outlet communicating with the cavity, the inlet communicates with a dust suction channel of the polishing tool, and the outlet is configured to discharge gas in the cavity, and the fan assembly is configured to form a dust discharge air path moving towards the inlet; the functional housing is arranged on one side of the machine body housing, and a projection of the functional housing on a plane of the base plate assembly is located in the base plate; a ratio of a projection area of the functional housing on the base plate to an area of the base plate is greater than or equal to 15% and less than or equal to 95%; an output shaft of the driving mechanism is supported on the base plate by a support, the support rotates around a support rotation axis, and the rotation axis is arranged away from the functional housing compared with an initial center of mass line of the base plate.

2. The sharpening tool of claim 1, wherein, the ratio of the projection area of the functional housing on the base plate to the area of the base plate is greater than or equal to 50% and less than or equal to 95%.

3. The sharpening tool of claim 1 or 2, wherein, an axial height of the functional housing is greater than or equal to 30% and less than or equal to 85%.

4. The sharpening tool of claim 3, wherein, the functional housing comprises an auxiliary holding part, the auxiliary holding part is located at a top end of the functional housing; and the auxiliary holding part is a recess inwardly recessed on the functional housing.

5. The sharpening tool of claim 1, wherein, the functional housing is snap-connected with the machine body housing, and the functional housing is further provided with an auxiliary fixing part matched with the base plate.

6. The sharpening tool of claim 1, wherein, the functional housing comprises an outer shell, the outer shell is arranged on a periphery of the machine body housing and cooperates with the machine body housing to form the cavity.

7. The sharpening tool of claim 1, wherein, the functional housing comprises an outer shell and an inner shell, the outer shell surrounds the inner shell and forms the cavity between the outer shell and the inner shell, and the inner shell is arranged on the machine body housing; an opening is formed between the outer shell and the inner shell, and the functional housing further comprises a cover plate covering the opening.

8. A sharpening tool according to any one of claims 5-7, characterized in that a filter support accommodating a filter is arranged in the functional housing, and the filter is arranged on a moving path of the air path.

9. The sharpening tool of claim 1, wherein, a dust discharge assembly is further arranged between the base plate assembly and the functional housing, and the dust suction channel is formed in the dust discharge assembly.

10. The sharpening tool of claim 9, wherein, the dust discharge assembly comprises: a busbar, the busbar is provided with a dust inlet, and the busbar is arranged on the base plate assembly and communicates with a dust suction port on the base plate assembly; and a conveying support, the conveying support communicates with the dust inlet of the busbar, and the conveying support is provided with a dust outlet, and the dust outlet is in butt joint with the inlet.

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