Sanding tool

A sanding tool includes a machine body, a power supply, a base plate assembly, a drive mechanism, and a control mechanism. The machine body includes a casing. The base plate assembly includes a base plate. The drive mechanism is disposed in the casing and includes a motor and an output shaft, the motor has a motor shaft rotating around a first axis, the output shaft rotates around a second axis, and the output shaft transmits power to the base plate assembly. The control mechanism is electrically connected to the motor and configured to control the sanding tool to operate. The first axis and the second axis form an included angle and are not in the same plane. A battery pack and the motor are disposed on two sides of the output shaft.

RELATED APPLICATION INFORMATION

This application claims the benefit under 35 U.S.C. § 119(a) of Chinese Patent Application No. CN 202011264256.5, filed on Nov. 12, 2020, Chinese Patent Application No. CN 202110029163.2, filed on Jan. 11, 2021, and Chinese Patent Application No. CN 202110786030.X, filed on Jul. 12, 2021, which are incorporated by reference in their entirety herein.

BACKGROUND

A sanding tool is a commonly used power tool and used for polishing and sanding surfaces of woods, plastics, stones, metals, and other materials through the swing of a base plate. While satisfying a sanding function, a handheld sanding tool generally should also have a relatively small volume and weight to satisfy the desire of a user for a convenient operation and improve user experience. However, as the power of the sanding tool increases, a drive motor disposed in the sanding tool generally has a relatively large volume so that the entire sanding tool has a greater volume. Therefore, how the sanding tool satisfies the requirements for a compact structure and miniaturization of the entire machine while having various functions becomes a technical problem to be solved urgently in the art.

SUMMARY

A sanding tool includes a machine body, a battery pack, a base plate assembly, a drive mechanism, and a control mechanism. The machine body includes a casing. The battery pack is disposed at a rear end of the machine body. The base plate assembly includes a base plate. The drive mechanism is disposed in the casing and includes a motor and an output shaft connected in a transmission manner, where the motor has a motor shaft rotating around a first axis, the output shaft rotates around a second axis, and the output shaft transmits power to the base plate assembly to drive the base plate assembly to move. The control mechanism is electrically connected to the motor and configured to control the sanding tool to operate. The first axis and the second axis form an included angle and are not in the same plane; and the battery pack and the motor are disposed on two sides of the output shaft.

In one example, the motor shaft is parallel to a plane where the base plate is located.

In one example, the battery pack includes a coupling surface on which a battery pack terminal is disposed, where the coupling surface is substantially perpendicular to the base plate and coupled to a coupling portion of the machine body.

In one example, the coupling surface of the battery pack is substantially parallel to the coupling portion of the machine body.

In one example, an included angle between a coupling surface of the battery pack and a plane where the base plate is located is greater than or equal to 0° and less than or equal to 120°.

In one example, the first axis of the motor shaft passes through the battery pack.

In one example, the motor includes a first extreme installation position and a second extreme installation position, where the first extreme installation position rotates in a plane parallel to the base plate by an included angle α with the output shaft as a center to reach the second extreme installation position.

In one example, the casing includes a left casing and a right casing that are divided relative to a center plane, and the first extreme installation position and the second extreme installation position are symmetrical about the center plane

In one example, the included angle α is greater than or equal to 0° and less than or equal to 30°.

In one example, the sanding tool further includes a fan assembly, where the fan assembly includes cooling fan blades configured to form a cooling air path; the cooling air path includes a first cooling air path and a second cooling air path, where the first cooling air path passes through the motor, the second cooling air path passes through the control mechanism, and the first cooling air path and the second cooling air path intersect at the cooling fan blades.

In one example, the sanding tool further includes a first air inlet, a second air inlet, and an air outlet that are disposed on the casing; where the air outlet is disposed on the casing in correspondence to the cooling fan blades; the first air inlet is disposed in correspondence to the motor or disposed upstream of the motor along the first cooling air path; and the second air inlet is disposed in correspondence to the control mechanism or disposed upstream of the control mechanism along the second cooling air path.

In one example, the first air inlet is disposed on a front side of the casing and the second air inlet is disposed on a rear side of the casing.

In one example, a ratio of a projection of the battery pack on a height of the sanding tool to the height of the sanding tool is less than or equal to 0.7.

In one example, the drive mechanism further includes a transmission assembly disposed between the motor shaft and the output shaft, where the transmission assembly includes a first gear installed on the output shaft and a second gear installed on the motor shaft and engaged with the first gear; and a stagger distance between the first axis and the second axis is less than or equal to a radius of the first gear.

In one example, projections of the motor and the battery pack in a vertical direction perpendicular to the base plate overlap.

A sanding tool includes a machine body, a battery pack, a base plate assembly, a drive mechanism, and a control mechanism. The machine body includes a casing. The battery pack is configured to supply a power source to the sanding tool. The base plate assembly includes a base plate. The drive mechanism is disposed in the casing and includes a motor and an output shaft connected in a transmission manner, where the motor has a motor shaft rotating around a first axis, the output shaft rotates around a second axis, and the output shaft transmits power to the base plate assembly to drive the base plate assembly to move. The control mechanism is electrically connected to the motor and configured to control the sanding tool to operate. A direction along which the battery pack is plugged in and out is parallel to a plane where the base plate is located; the first axis and the second axis form an included angle and are not in the same plane; and a ratio of a diameter of the motor to a height of the sanding tool is greater than or equal to 0.2 and less than or equal to 0.6.

In one example, the ratio of the diameter of the motor to the height of the sanding tool is greater than or equal to 0.3 and less than or equal to 0.4.

In one example, a projection of the battery pack on the plane where the base plate is located overlaps with the base plate.

A sanding tool includes a machine body, a battery pack, a base plate assembly, a drive mechanism, and a control mechanism. The machine body includes a casing. The battery pack is configured to supply a power source to the sanding tool. The base plate assembly includes a base plate. The drive mechanism is disposed in the casing and includes a motor and an output shaft connected in a transmission manner, where the motor has a motor shaft rotating around a first axis, the output shaft rotates around a second axis, and the output shaft transmits power to the base plate assembly to drive the base plate assembly to move. The control mechanism is electrically connected to the motor and configured to control the sanding tool to operate. The first axis and the second axis form an included angle and are not in the same plane; and a distance between a center of the motor and the second axis of the output shaft is less than or equal to ½ of a length of the base plate.

In one example, the casing includes a body casing and a functional casing; where the functional casing includes a dust collection box and dust collection channels that are integrally formed, where the dust collection channels pass through the body casing and are detachably installed on the base plate assembly; and the body casing is provided with a gas discharge port for discharging gas in the dust collection box.

The present disclosure has the following beneficial effects: the motor is disposed transversely and the battery pack is plugged transversely, thereby reducing the height of the sanding tool and improving the compactness of the entire machine.

DETAILED DESCRIPTION

The present disclosure is described below in detail in conjunction with drawings and examples. It is to be understood that the examples described herein are intended to explain the present disclosure and not to limit the present disclosure.

FIG.1shows a sanding tool100in an example of the present disclosure. The sanding tool100in examples of the present disclosure is specifically a sander and more specifically a flat sander that can be held and operated by a user with one hand or two hands. It is to be understood that the sanding tool100may be a round sander, a triangular sander, a square sander, a special-shaped sander, etc., as long as the sanding tool can satisfy technical solutions of the present disclosure and any applicable sanding tool is within the scope of the present disclosure.

The sanding tool100in the examples of the present disclosure includes at least a machine body200, a base plate assembly300, a control mechanism400, a fan assembly500, a power supply600, and a drive mechanism700. As shown inFIG.7, the machine body200includes a casing201, where the casing201includes a left casing201L and a right casing201R that are divided relative to a center plane209. The drive mechanism700and the control mechanism400are both disposed inside the casing201, and the drive mechanism700includes a motor701and an output shaft702. The power supply600may be a direct current (DC) power supply such as a battery pack or may be an alternating current (AC) power supply.

Referring toFIG.8, at least two support frames205are fixed on a base plate301. During assembly, the left casing201L and the right casing201R are closed to the middle respectively in left and right directions, and the support frames205are correspondingly engaged with limiting ribs in the left casing201L and the right casing201R. Further, the left casing and the right casing are fastened by screws. During disassembly, the screws for fixing the left casing and the right casing are removed so that the two casings can be separated in the left and right directions, respectively.

Referring toFIG.2, a holding portion203is disposed at the top of the machine body200for the user to hold. In an example, the holding portion203is designed with an arc conforming to the mechanics of one-hand holding or two-hand holding. A gripping unit2031recessed into the inside of the casing201is disposed at a bottom end of the holding portion203so that the machine body can be held more closely with one hand or two hands.

The base plate assembly300includes the base plate301and a sanding piece fixed on the base plate301. A flat surface is formed on the base plate301, and the sanding piece is disposed on a side of the base plate301facing away from a casing assembly. The sanding piece may be sandpaper or other types of abrasive or polishing parts and may be removably attached to the base plate in a conventional manner such as hook and loop connectors and/or clamp retainers. The base plate301is provided with a base plate dust suction port configured to suck dust generated during an operation.

The drive mechanism700is configured to drive the base plate assembly300to move. Specifically, the drive mechanism700includes the motor701and the output shaft702connected in a transmission manner. The motor701has a motor shaft701arotating around a first axis705; the output shaft702rotates around a second axis706, and the output shaft702transmits power to the base plate assembly300to drive the base plate assembly300to move. It is to be understood that the drive mechanism700may further include a transmission assembly700adisposed between the motor shaft701aand the output shaft702, where the transmission assembly700amay be any suitable transmission mechanism such as gear transmission and belt transmission, which is not limited herein. In this example, as shown inFIG.4A, the drive mechanism700adopts a two-stage gear transmission, and the transmission assembly700aincludes a first gear703installed on the output shaft702and a second gear704installed on the motor shaft701aand engaged with the first gear703. In an example, the first gear703is a face gear and the second gear704is a cylindrical gear. Optionally, the first gear703and the second gear704may also be hypoid gears or crossed helical gears. In this example, a radius of the first gear703is about 15 mm, which means that the radius within a certain allowable error range belongs to the disclosure of this example.

In this example, a center of a stator lamination7011of the motor701is defined as a center of the motor, and a distance between the center of the motor and the second axis706is L2,where a ratio of L2 to a length of the base plate is less than or equal to ½. Preferably, the ratio of L2 to the length of the base plate is approximately equal to ⅓. Regarding the length of the base plate, lengths of base plates with different shapes are defined differently. For example, the length of a circular base plate is a diameter of a circle, the length of a rectangular base plate is a length of the longest side of a rectangle, and the length of a base plate of a triangular sander is a length of a median from a base of a triangle.

It is to be understood that a distance between an outer surface of the stator lamination7011and the motor shaft701ais a radius of the motor701. In this example, a ratio of a diameter of the motor to a height of the sanding tool is greater than or equal to 0.2 and less than or equal to 0.6, for example, may be 0.3, 0.4, or 0.5, which prevents a relatively large dimension of the motor from affecting the compactness of the entire machine.

In this example, a ratio of an axial height of the entire machine to the length of the base plate is greater than or equal to 0.5 and less than or equal to 1, for example, may be 0.5, 0.6, 0.8, or 0.9, which reduces the dimension of the entire machine.

In this example, a ratio of rated power of the motor701to the axial height H of the entire machine is less than or equal to 2.5 w/mm. For example, the ratio of the rated power of the motor701to the axial height of the entire machine is 2.3 w/mm, 2.2 w/mm, 2.0 w/mm, 1.8 w/mm, 1.5 w/mm, 1.3 w/mm, or 1.0 w/mm. A ratio of a rated voltage of the battery pack600to the axial height H of the entire machine is less than or equal to 0.3 v/mm. For example, the ratio of the rated voltage of the battery pack600to the axial height of the entire machine is 0.2 v/mm or 0.1 v/mm. That is, when a relatively high output power of the tool is ensured or the tool adopts a battery pack with a relatively high rated voltage, the height of the sanding tool can be reduced to 120 mm or less, for example, 110 mm or less. For example, when the rated power of the motor is 250 W and the rated voltage of the battery pack is 18 V, the height of the sanding tool is reduced to 120 mm or less, for example, 110 mm or less.

The preceding reasonable layout prevents an increase of the height of the entire machine and improves the compactness of the entire machine while ensuring that the motor has relatively great energy efficiency.

In this example, as shown inFIG.3A, the first axis705and the second axis706form an included angle. That is, the motor shaft701ais not parallel to the output shaft702. For example, the motor701may be perpendicular to the output shaft702or may be disposed obliquely above the output shaft702or in front of or to the left or right of the output shaft702or at another position that can accommodate the motor701in the casing201.

In this example, the first axis705is perpendicular to the second axis706or the first axis705is parallel to a plane where the base plate301is located, that is, the motor701is disposed transversely in any plane parallel to the plane where the base plate301is located. In a preferred implementation, as shown inFIGS.3A and4B, the motor701is disposed transversely in a cavity formed by the casing at a front end of the base plate301, where the front end refers to an end of the base plate301opposite to the battery pack. Therefore, while the height of the entire machine is reduced, a weight of the battery pack is balanced such that a center of gravity of the entire machine is close to the output shaft and the entire machine has a relatively good balance, thereby reducing the vibration of the tool in use.

In this example, as shown inFIGS.3A and4A, the first axis705and the second axis706are not in the same plane, that is, the motor shaft701aand the output shaft702are staggered. For example, a first axis in the same plane as the second axis706, as shown inFIGS.3B and4B, is defined as a reference axis707, and then a distance between the first axis705and the reference axis707when the motor shaft701aand the output shaft702are staggered is a stagger distance L1 between the first axis705and the second axis706. In the examples of the present disclosure, the stagger distance L1 is less than or equal to the radius of the first gear. Preferably, the stagger distance between the first axis and the second axis is 1 mm.

In this example, a projection of the motor701on the plane where the base plate301is located is within the base plate301. The motor701includes a first extreme installation position and a second extreme installation position. It is to be understood that a center position of the motor701is between the first extreme installation position and the second extreme installation position. As shown inFIG.11, the first extreme installation position rotates in a plane parallel to the base plate301by an included angle α with the second axis706of the output shaft702as a center to reach the second extreme installation position. The included angle α is greater than or equal to 0° and less than or equal to 30°. For example, the included angle α is 30°, 25°, 20°, or 10°.

In this example, the first extreme installation position and the second extreme installation position are symmetrical about the center plane209. That is, the first extreme installation position and the second extreme installation position are disposed on two sides of the center plane209, respectively and when the motor701is disposed at the first extreme installation position or the second extreme installation position, an included angle between the motor shaft701aand the center plane209is greater than or equal to 0° and less than or equal to 15°.

Through the preceding reasonable layout and design, a motor axis and an output axis form an included angle, which reduces the height of the sander; the motor axis and the output axis are staggered so that the motor can be adaptively positioned in a space in the casing, and the compactness of the entire machine can be further improved.

The sanding tool100in the examples of the present disclosure further includes a membrane switch800and the control mechanism400. The control mechanism400is configured to control the motor to rotate. The control mechanism400includes a printed circuit board assembly (PCBA) on which related elements such as capacitors and inductors are disposed. The control mechanism400is connected to the membrane switch800and the power supply600. The user can control the motor to be turned on or off by operating the membrane switch800, where the membrane switch800is disposed on the casing201. In this example, the membrane switch800may be disposed at a front end of the holding portion203. Of course, the membrane switch may not necessarily be disposed at the front end of the holding portion203and may be disposed at any position of the machine body. The traditional mechanical switch is replaced with the membrane switch800so that the tool is powered on/off with less efforts and more convenience, improving the user experience.

In this example, the control mechanism400is disposed vertically (that is, perpendicular to the plane where the base plate is located) or obliquely in the casing201. Referring toFIG.3A, the control mechanism400is substantially parallel to a coupling portion202of the machine body. Alternatively, as shown inFIG.6, the control mechanism400is substantially perpendicular to the coupling portion202. Optionally, the control mechanism400may be disposed transversely in the holding portion203. In this example, the control mechanism400is the PCBA which is parallel to the coupling portion202of the machine body, and a distance between the assembly and the second axis706is greater than the radius of the first gear703. In this example, as shown inFIG.12, an included angle β between the PCBA400and a plane where the coupling portion202is located satisfies that 0°≤β≤30° and may be, for example, 30°, 25°, 20°, 15°, or 10°.

As shown inFIG.9, the sanding tool100in this example further includes the fan assembly500and a counterweight assembly900. As shown inFIGS.9and10, the fan assembly500is sleeved on the output shaft702through a first axle hole506in the middle. The fan assembly500includes a blade installation plate501, and cooling fan blades502are disposed above the blade installation plate501and configured to form a cooling air path. Dust collection fan blades503are disposed below the blade installation plate501and configured to form a dust collection air path. The cooling fan blades502are disposed evenly on an upper side of the blade installation plate501in a circumferential direction of the blade installation plate501; and the dust collection fan blades503are disposed evenly on a lower side of the blade installation plate501in the circumferential direction of the blade installation plate501.

The counterweight assembly900is disposed below the fan assembly500and specifically includes a counterweight901, a counterweight plate surface902, and an eccentric shaft903. The counterweight plate surface902is sleeved on the eccentric shaft903through a second axle hole905in the middle. The counterweight901is disposed on an upper side of the counterweight assembly900and a bump on the counterweight plate surface902. Correspondingly, the blade installation plate501of the fan assembly500is provided with a fan through hole504fitting with the counterweight901in shape so that the counterweight902is engaged with the fan assembly500through the fan through hole504. The fan through hole504is a special-shaped through hole and has the same shape as the counterweight901.

In this example, the fan is in transition fit with the eccentric shaft903. The eccentric shaft903is in interference fit with the output shaft702, and the output shaft702may drive the eccentric shaft903to rotate. Alternatively, the eccentric shaft903may be in transition fit and a flat fit with the output shaft702. In this example, the fan assembly500is a plastic assembly and the counterweight assembly900is a metal assembly.

In an alternative implementation, the fan assembly500and the counterweight assembly900may be an integral metal assembly which has the functions of both the counterweight assembly and the fan assembly. The metal assembly with such functions is a mature mechanical assembly and is not repeated herein.

As shown inFIG.9, the sanding tool100further includes a wind deflector505. The wind deflector505is provided with a dust outlet5051of the wind deflector that is docked with a dust outlet204of the casing, and the wind deflector505is recessed inwards so that an accommodation portion5052is formed for accommodating the counterweight assembly900and the dust collection fan blades503. The fan assembly500is connected to the drive mechanism and driven by the motor701to rotate. After the dust collection fan blades503rotate, a negative pressure is formed in the accommodation portion506of the wind deflector505so that dust generated during the sanding of the base plate assembly300is sucked and enters a dust collection device connected to the dust outlet204through the dust outlet5051under the drive of a rotating airflow generated by the rotation of the dust collection fan blades503. The dust collection device may be an independent dust collection box and other similar devices.

As shown inFIG.2, in this example, the dust outlet204of the casing is disposed at a rear end of the casing201and on a lower side of the coupling portion202. In another alternative example, as shown inFIG.7, the dust outlet204of the casing may be disposed on a left and/or right side of the casing201.

In this example, the cooling air path includes a first cooling air path502aand a second cooling air path502b.As shown inFIG.14, arrows in the figure indicate a direction of the cooling air path. The first cooling air path502apasses through the motor701to dissipate heat for the motor701; and the second cooling air path502bpasses through the control mechanism400to dissipate heat for the control mechanism400. The first cooling502aair path and the second cooling air path502bintersect at the cooling fan blades502. That is, the two cooling air paths are independent of each other and do not affect each other.

As shown inFIG.2, the two cooling air paths at least include two air inlets and one air outlet disposed on the casing201. An air outlet208is disposed on the casing201in correspondence to the cooling fan blades502; a first air inlet206is disposed in correspondence to the motor701or disposed upstream of the motor701along the first cooling air path502a;and a second air inlet207is disposed in correspondence to the control mechanism400or disposed upstream of the control mechanism400along the second cooling air path502b.In this example, the first air inlet206is disposed on a front side of the casing201and the second air inlet207is disposed on a rear side of the casing201. In this example, after basic positions of the two air inlets are determined, the shape or dimension of each air inlet can be adjusted according to specific design requirements, which is not limited herein.

Two independent cooling air paths are provided to dissipate heat for the control mechanism and the motor, respectively, thereby increasing the heat dissipation area of the control mechanism and the motor and improving the heat dissipation effect of the tool.

In this example, the power supply of the tool is the battery pack. As shown inFIG.2, the battery pack600includes a coupling surface601. The coupling surface601of the battery pack600is connected to the coupling portion202of the machine body200. The coupling surface601refers to a plane where a connection terminal on the battery pack600is located and may be a real plane or an imaginary plane. It is to be noted that the battery pack600has the longest dimension in a direction along which the battery pack600is plugged in and out.

The direction along which the battery pack600is plugged in and out may be parallel to the plane where the base plate301is located. The direction along which the battery pack is plugged in and out is parallel to the plane where the base plate is located, where the battery pack600is plugged in and out in a left-and-right direction or in a front-and-rear direction. When the battery pack600is plugged in and out in the left-and-right direction, the coupling surface is perpendicular to the base plate301or the coupling surface is inclined relative to the base plate301.

In this example, the battery pack is plugged in and out from a main machine in the left-and-right direction inFIG.3A, the coupling surface601of the battery pack600is substantially perpendicular to the base plate301, and the battery pack600is coupled to the coupling portion202of the machine body200. In this example, a distance between the coupling surface601of the battery pack600and the output shaft702is less than ½ of the length of the base plate. In this example, the length of the base plate is a length of a median from a base of a triangular base plate.

As an alternative example, the direction along which the battery pack600is plugged in and out may be perpendicular to the base plate301, that is, the battery pack is plugged in and out from the machine body in an up-and-down direction inFIG.3A, or the direction along which the battery pack is plugged in and out may be inclined relative to the base plate.

Of course, to obtain a smaller height of the entire machine, as an alternative example, the battery pack may be plugged in and out in the left-and-right direction and the coupling surface601is inclined relative to the base plate301. At this time, the coupling surface601may be inclined towards the front end inFIG.3Aor inclined towards the rear end inFIG.3A. Further, the direction along which the battery pack600is plugged in and out may be parallel to the base plate301and the coupling surface601is parallel to the base plate301, that is, the battery pack is plugged in and out from the entire machine in the front-and-rear direction.

As an alternative example, as shown inFIG.13, an included angle γ between the coupling surface601of the battery pack600and the plane where the base plate301is located satisfies that 0°≤γ≤120°. Preferably, the included angle γ satisfies that 45°≤γ≤120° and may be, for example, 45°, 60°, 90°, 100°, or 120°.

As an alternative example, the first axis705passes through the battery pack600. That is, regardless of the included angle γ between the coupling surface601of the battery pack600and the base plate301, projections of the motor701and the battery pack600on a projection plane perpendicular to the base plate301overlap, where the projection plane refers to a plane extending in the left-and-right direction and being perpendicular to the base plate301.

In this example, a ratio of a height of the battery pack600on the projection plane to the height of the tool is less than or equal to 0.7, for example, 0.68, 0.65, 0.63, or 0.6.

A projection of the battery pack600on the plane where the base plate301is located overlaps with the base plate301. That is, the projection of the battery pack600on the plane where the base plate301is located completely falls within the base plate301or partially falls within the base plate301. In this example, a part of the battery pack whose projection does not fall within the base plate301has a length of about 0 to 10 mm, that is, it is also within the scope of the present application that the length of the part of the battery pack whose projection does not fall within the base plate301is about 10 mm.

The battery pack600and the motor701are disposed on two sides of the output shaft, respectively. The battery pack600is disposed on a first radial line708with the second axis706as the center, and the motor701is disposed on a second radial line709with the second axis706as the center, where the first radial line708and the second radial line709are each parallel to the base plate301and both extend radially from the second axis706. Being disposed on two sides means that an included angle θ between projections of the first radial line708and the second radial line709shown inFIG.15on the base plate satisfies that 80°≤θ≤180 ° without affecting the length and/or height of the entire machine and may be, for example, 80°, 90°, 120°, 150°, or 180°.

In this example, the battery pack600and the motor701are disposed on front and rear sides of the output shaft702, respectively and the projections of the motor701and the battery pack600on the projection plane perpendicular to the base plate301overlap, where the projection plane refers to the plane extending in the left-and-right direction and being perpendicular to the base plate301. That is, the projection of the motor701on the projection plane completely or partially falls within the projection of the battery pack600on the projection plane.

In examples of the present application, when a battery pack with a rated voltage of 18V to 24V or higher is configured in the tool, the height of the entire machine is less than or equal to 120 mm, for example, less than or equal to 110 mm.

Through the preceding reasonable layout and design, the battery pack and the motor are disposed transversely on two sides of the output shaft, respectively, and the battery pack is configured to be plugged in and out in different directions and at different angles, so as to ensure that the battery pack is disposed without increasing the height or length of the entire machine; a direction in which the motor is disposed transversely relative to the plane of the base plate or an angle at which the motor is inclined relative to the plane of the base plate is set, thereby reducing the effect of the motor on the height and length of the entire machine. In this manner, the compactness of the entire machine is ensured.

It is to be understood that in the preceding examples, the entire machine is provided with the dust outlet to which an external dust collection box is connected. After the dust collection box is installed on the entire machine, the main machine has a bulky structure and a relatively large volume, and the dust collection device is inconvenient to clean or fails to be thoroughly cleaned. Therefore, while satisfying the compactness, the sander also needs to satisfy the requirements for convenient dust collection, convenient cleaning, and miniaturization of the entire machine.

To solve the preceding problems, the structure of the casing is further optimized in the present application.

In an example, as shown inFIG.16, a sanding tool10includes a base plate assembly20, a casing30, a fan assembly40, a drive mechanism50, and a power supply. As shown inFIG.17, the casing30includes a body casing31and a functional casing32, and the drive mechanism50and the fan assembly40are both disposed in the casing30. The power supply may be a DC power supply such as a battery pack80or may be an AC power supply. In the present application, the DC power supply is used as an example for description.

Referring toFIGS.16to21andFIG.25, the base plate assembly20includes a base plate21and a sanding piece fixed on the base plate21. A flat surface is formed on the base plate21, and the sanding piece is disposed on a side of the base plate21facing away from a casing assembly. The sanding piece may be sandpaper or other types of abrasive or polishing parts and may be removably attached to the base plate21in a conventional manner such as hook and loop connectors and/or clamp retainers. The base plate21is provided with a base plate dust suction port configured to suck dust generated during an operation.

The drive mechanism50is configured to drive the base plate assembly20to move and the fan assembly40to rotate. The drive mechanism50includes a motor51and an output shaft52connected to the motor51. The fan assembly40is installed on the output shaft52and driven to rotate by the output shaft52. The fan assembly40includes a dust collection fan41and a multifunctional fan42. The dust collection fan41is disposed at an upper end of the output shaft52and the multifunctional fan42is disposed at a lower end of the output shaft52. The multifunctional fan42is a two-in-one fan and includes heat dissipation fan blades421and an eccentric block422. The heat dissipation fan blades421are configured to form an air path for dissipating heat for the motor51when the multifunction fan42rotates. In the present application, an eccentric shaft423is connected to a bottom end of the output shaft52. The eccentric shaft423is installed in the base plate assembly20. The motor51drives a motor shaft511to rotate, thereby driving the eccentric shaft423to rotate and driving the base plate21to perform eccentric movement on a surface of a workpiece. To balance the vibration during the eccentric movement, the sanding tool in the examples of the present disclosure is further provided with the eccentric block422, where a eccentric block422is disposed on the multifunctional fan42or may be disposed on the base plate21.

In this example, as shown inFIG.24, the drive mechanism50adopts a two-stage gear transmission, and a transmission assembly includes a first gear521installed on the output shaft52and a second gear5111installed on the motor shaft511and engaged with the first gear521. The output shaft52is perpendicular to the plane of the base plate and configured to transmit a driving force of the motor51to the base plate assembly20to drive the base plate assembly20to perform sanding. In an example, the first gear521is a face gear and the second gear5111is a cylindrical gear. Optionally, the first gear521and the second gear5111may also be hypoid gears or crossed helical gears.

In this example, the motor shaft511is parallel to the plane of the base plate and perpendicular to the output shaft52. The dust collection fan41and the multifunctional fan42are disposed at two ends of the output shaft52, respectively, and the face gear521engaged with the gear on the motor shaft511is disposed at a middle position of the output shaft52. It is to be understood that as shown inFIG.23, an axis of the motor shaft511may be located directly above a center line24of the base plate or may have a certain included angle with the center line24of the base plate. A size of the included angle may be adjusted freely on the premise that the overall dimension of the tool is not affected. That is, a projection of the motor51on the plane of the base plate does not exceed the plane of the base plate. In this manner, the case where the length of the entire machine is increased while the height of the entire machine is reduced can be avoided, thereby ensuring the compactness in structure of the entire machine.

Referring toFIGS.17and18, the casing30includes the body casing31and the functional casing32. The body casing31includes a left casing311and a right casing312. During assembly, the left casing311and the right casing312are closed to the middle respectively in left and right directions. The left casing311is provided with a left body installation hole311L, the right casing312is provided with a right body installation hole312R, and two dust collection channels of the functional casing32are detachably installed on the base plate assembly20through the two body installation holes. In this example, as shown inFIGS.25to27, the functional casing32is a saddle-shaped casing and includes a dust collection box321at the top of the saddle-shaped casing and two (left and right) dust collection channels322disposed at a lower end of the dust collection box321and integrally formed with the dust collection box321. A holding portion3211is formed on the dust collection box321of the functional casing32. The holding portion3211is disposed at a top end of the functional casing32. The holding portion3211is a recess formed through the functional casing32being recessed inwards. In this example, the holding portion203is designed with an arc conforming to the mechanics of one-hand holding or two-hand holding. In this example, the holding portion3211is equivalent to an upper cover of the dust collection box321, and a lower cover3212of the dust collection box is detachably installed to a lower end of the dust collection box321.

In an example, the motor shaft511is perpendicular to the two (left and right) dust collection channels322and disposed at the lower end of the dust collection box321and a middle position between the two (left and right) dust collection channels322, that is, the motor51is disposed transversely in an empty space in the middle of the saddle-shaped functional casing32. Preferably, the motor shaft511may be perpendicular to a connection line between the two (left and right) dust collection channels322or may have a certain included angle with the intermediate connection line.

In this example, the lower cover3212of the dust collection box is provided with a filter installation port32121. Therefore, a filter60is detachably installed in the filter installation port32121and configured to cover the filter installation port32121, so as to form an accommodation space. In this example, the filter60is a pleated filter paper and covers the filter installation port32121to prevent dust from flying out of a gas discharge port313on the body casing31along with an airflow, thereby avoiding air pollution.

In the examples of the present disclosure, as shown inFIG.25, the dust collection fan41may be disposed at a certain distance away from the filter installation port32121, and the preceding distance may be generally set to zero. That is, the dust collection fan41can close the filter installation port32121. At this time, since the dust collection fan41is not in the accommodation space, a wind force of the dust collection fan41does not cause interference to the filter60, that is, the dust collection fan41does not blow away the filter60.

In the examples of the present disclosure, as shown inFIGS.21to26, the dust collection fan41may be disposed in an accommodation space61formed by the filter60. When the dust collection fan41is disposed in the accommodation space, the wind force of the dust collection fan41may blow away the filter60. To prevent the preceding case, in the examples of the present application, a windshield70is disposed on an inner side of a ring wall of the accommodation space61to block the wind generated by the dust collection fan41and prevent the filter60from being blown away or loosened. Through the preceding reasonable design and layout, the dust collection fan41is accommodated in the accommodation space, which is equivalent to accommodating the height of the dust collection fan41in the dust collection box321, thereby further reducing the height of the entire machine and ensuring the compactness in structure of the entire machine.

In the examples of the present disclosure, the base plate assembly20is further provided with a collection plate22, where the collection plate22communicates with a dust suction port on the base plate assembly20and is configured to collect dust generated when the sanding tool10is operating. To prevent dust in the collection plate22from entering the inside of the tool and affecting the normal operation of the tool, a collection plate cover23is provided for closing the collection plate22so that dust entering the collection plate22through the dust suction port of the base plate remains in the collection plate22. It is to be noted that two internal installation holes231are disposed on the collection plate cover23, and the dust collection channels322are inserted into the body installation holes on the body casing31and then enters the collection plate22through the internal installation holes231on the collection plate cover23so that the dust in the collection plate22can be moved into the dust collection box321through the dust collection channels322. It is to be understood that the wind force generated through the rotation of the dust collection fan41forms a negative pressure in the dust collection box321through the accommodation space61so that dust generated during the sanding of the base plate assembly20is sucked into the collection plate22through the dust suction port of the base plate under the drive of the rotating airflow generated through the rotation of the dust collection fan41, enters the dust collection channels322through entrances of the dust collection channels322in the collection plate22, and finally is collected in the dust collection box321through the dust collection channels322.

Referring toFIG.22, a dust discharge path323roughly indicates a path of dust from the dust suction port on the base plate21into the collection plate22, the dust collection channels322, and the dust collection box321.

In the examples of the present application, the functional casing32may be transparent, and the user can directly see the degree of accumulation of dust in the dust collection channels322and the dust collection box321so that the dust can be cleaned up with more timeliness.

In addition, referring to the tool shown inFIGS.16and17, the body casing31and the functional casing32have substantially the same height, and the dust collection channels322of the functional casing32penetrate the body casing31without increasing the height of the entire machine.

Through the preceding design, the dust collection box321and the dust collection channels322are transparent and integrally formed, and the dust collection channels322directly suck dust from the base plate or from the collection plate22so that the dust collection box321and the dust collection channels322are more convenient to remove and install with increased visibility; at the same time, since the functional casing32has substantially the same height as the body casing31, the height of the entire machine is not increased though the dust collection box321is disposed at the top of the entire machine, thereby ensuring the compactness in structure of the entire machine.

In this example, the power supply of the tool10is the battery pack80. As shown inFIG.28, the battery pack80includes a coupling surface81, and the coupling surface81of the battery pack80is connected to a coupling portion11of the sanding tool10. The coupling surface81refers to a surface of the battery pack80on which a connection terminal is disposed and is substantially a plane. A direction along which the battery pack80is plugged in and out is parallel to a plane where the base plate21is located. In a specific implementation, the coupling surface81is substantially perpendicular to the base plate21and coupled to the coupling portion11of the tool10. It is to be noted that the battery pack80has the longest dimension in the direction along which the battery pack80is plugged in and out. It is to be understood that when the battery pack80is installed to the tool10in the preceding manner, the direction where the battery pack80has the longest dimension is parallel to the base plate and the coupling surface81is substantially perpendicular to the base plate21, which is equivalent to the battery pack80being transversely plugged into the entire machine, so that the smaller height of the entire machine can be obtained.

Through the preceding reasonable layout and design, the battery pack and the motor are disposed transversely on two sides of the output shaft, respectively, the motor is disposed transversely, and the battery pack is plugged transversely, thereby ensuring that the battery pack and the motor are disposed without increasing the height or length of the entire machine. In this manner, the compactness of the entire machine is ensured.

It is to be noted that the above are merely preferred examples of the present disclosure and technical principles used therein. It is appreciated by those skilled in the art that the present disclosure is not limited to the examples described herein. Those skilled in the art can make various apparent modifications, adaptations, and substitutions without departing from the scope of the present disclosure. Therefore, while the present disclosure has been described in detail through the preceding examples, the present disclosure is not limited to the preceding examples and may include more other equivalent examples without departing from the concept of the present disclosure. The scope of the present disclosure is determined by the scope of the appended claims.