CN110039420B

CN110039420B - Polishing tool, and method for detaching and installing base plate assembly of polishing tool

Info

Publication number: CN110039420B
Application number: CN201910037253.9A
Authority: CN
Inventors: 王家达; 张士松; 钟红风
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2018-01-15
Filing date: 2019-01-15
Publication date: 2024-04-09
Anticipated expiration: 2039-01-15
Also published as: CN110039442A; CN209868288U; CN110039442B; CN110039420A; CN209408223U

Abstract

The invention relates to a polishing tool, which comprises a main body part, a motor, a torque output part and a transmission part, wherein the main body part comprises a shell; the bottom plate assembly is detachably arranged below the main body part and comprises a polishing bottom plate, and the polishing bottom plate is used for being in contact with the working surface and realizing polishing work under the drive of the torque output part; the energy supply assembly is positioned on one side of the main body part and used for supplying energy to the motor; the energy supply assembly comprises a placing plate which is arranged away from the motor, and the polishing tool can be placed on the surface where the placing plate is arranged; the sanding tool further includes an operating member rotatably disposed with respect to the housing, the operating member being located above the body portion away from the floor assembly, and the operating member being operable to effect mounting or separation of the floor assembly from the body portion when the sanding tool is placed on either the floor or the floor.

Description

Polishing tool, and method for detaching and installing base plate assembly of polishing tool

Technical Field

The invention relates to a polishing tool, a method for disassembling and installing a base plate assembly of the polishing tool, belongs to the field of electric tools.

Background

The existing sanding machine comprises a circular sand machine, flat sand and the like, wherein an output shaft of the circular sand machine drives a polishing bottom plate to do circular sand motion, namely regular orbital motion of revolution and rotation, and the circular sand machine is used for grinding a large amount of materials, such as rough grinding. The self-transmission movement of the sanding sole plate of the flat sanding is limited, so that the sanding sole plate is capable of performing a orbital movement with regular revolutions only, and is suitable for grinding smaller amounts of material, for example for fine machining or finishing.

When the polishing bottom plate moves in a plate sand mode, different bottom plate shapes can be suitable for different operation conditions. For example rectangular sand bottom plates can be used polishing under conventional operation conditions; the triangular board sand bottom board has obviously more advantages when polishing the working surface in the corner area; the special-shaped bottom plate with the shape of the finger is more suitable for polishing a narrow working surface in a region.

The sander capable of adapting to various operation conditions brings convenience to users, so that the sander is widely favored in the market. The various operating conditions herein include operating condition requirements for fine grinding and coarse grinding, or different floor shapes can meet operating conditions for different grinding areas. The sander which can adapt to various operation conditions is called as a multifunctional sander.

In a multifunctional sander, it is a common way to replace the base plate in order to achieve multiple functions. At that time, at present, when changing the bottom plate, it is generally troublesome to need to manually change the bottom plate, and specifically, one of them collet bottom plate subassembly, the fixed main part of another hand, then with bottom plate subassembly and main part connection.

Disclosure of Invention

The invention aims to provide a polishing tool which is easy to put and more comfortable to operate.

In order to achieve the above purpose, the present invention provides the following technical solutions: a grinding tool, comprising

A main body portion including a housing, a motor located in the housing, a torque output portion, and a transmission portion for transmitting power of the motor to the torque output portion;

the bottom plate assembly is detachably arranged below the main body part and comprises a polishing bottom plate, and the polishing bottom plate is used for being in contact with a working surface and realizing polishing under the drive of the torque output part;

an energy supply assembly located on one side of the main body portion for supplying energy to the motor;

the energy supply assembly comprises a placement plate arranged away from the motor, and the polishing tool can be placed on the surface where the placement plate is located; the sanding tool further includes an operating member rotatably disposed relative to the housing, the operating member being located above the body portion away from the floor assembly, and being operable to effect installation or separation of the floor assembly from the body portion when the sanding tool is placed on either the floor or the floor.

Further, the first rotation axis of the operating member is perpendicular to the surface of the polishing base plate or the first rotation axis of the operating member is parallel to the surface of the placing plate.

Further, the main body part includes the first connecting piece that can drive the rotation by the operating piece, the bottom plate subassembly includes can for the rotatory bottom plate pivot of bottom plate of polishing, be equipped with in the bottom plate pivot with first connecting piece is joined in marriage and is connected in order to realize the main body part with the second connecting piece of bottom plate subassembly inseparable connection.

Further, the housing includes a main housing and a grip housing disposed at an angle to the main housing, the motor and the intermediate shaft are located inside the main housing, the intermediate shaft is located between the motor and the grip housing, and the grip housing is located between the main housing and the energy supply assembly.

Further, the projection of the gravity center of the polishing tool in the polishing bottom plate falls into the plane where the polishing bottom plate is located or the projection of the gravity center of the polishing tool in the placing plate falls into the plane where the placing plate is located.

Further, the operating member includes an operating handle having an open state and a closed state, and when in the closed state, a length of the operating handle from a trailing end of the operating handle away from the first axis to the first axis is between 55mm and 110 mm.

Further, when in the open state, the distance from the tail end to the upper end face of the housing is between 20mm and 40 mm.

Further, the energy supply assembly is a battery pack which is inclined towards the motor more downwards, and the angle between the plane of the placing plate and the first rotation axis of the operating piece is between 0 and 45 degrees.

The invention also provides a method for disassembling the bottom plate assembly of the polishing tool, which comprises the following steps:

a main body portion including a housing, a motor located in the housing, a torque output portion, a transmission portion for transmitting power of the motor to the torque output portion, and a first connection member for connection with a floor assembly;

the bottom plate assembly is detachably arranged below the main body part and comprises an eccentric rotating shaft and a polishing bottom plate, the eccentric rotating shaft can rotate relative to the polishing bottom plate under the action of the torque output part so as to drive the polishing bottom plate to realize polishing, and a second connecting piece connected with the first connecting piece is arranged on the eccentric rotating shaft;

The operating piece is positioned above the main body part far away from the bottom plate assembly, is rotatably arranged relative to the shell, and can drive the first connecting piece to rotate relative to the second connecting piece so as to realize connection or separation of the main body part and the bottom plate assembly;

the bottom plate assembly disassembling method of the polishing tool comprises the following steps: placing the polishing tool by taking a placing plate as a bottom plane;

the first axis of rotation of the operating member is rotated until the base plate assembly is disconnected from the body portion.

The invention also provides a method for installing the bottom plate assembly of the polishing tool, which comprises the following steps:

the mounting method of the bottom plate assembly of the polishing tool comprises the following steps:

placing the polishing tool the plate is placed as a bottom plane;

aligning the first connector with the second connector; and

and rotating the operating piece around the first rotation axis until the first connecting piece and the second connecting piece complete the connection operation.

The invention has the beneficial effects that: because be provided with the board of placing that deviates from the motor on energy supply subassembly, so, this burnisher can regard as placing the face with placing the board as placing the face also can regard as the bottom plate of polishing, and when regard as or place the board as placing the face with the bottom plate of polishing, the installation and the separation of bottom plate subassembly and main part are all operatively realized to the operating piece to make this burnisher operate more travelling comfort and more easily at the in-process of installation and separation bottom plate subassembly and main part.

The foregoing description is only an overview of the present invention, and is intended to provide a better understanding of the present invention, as it is embodied in the following description, with reference to the preferred embodiments of the present invention and the accompanying drawings.

Drawings

Fig. 1 is a schematic view of a sander according to the present invention, in which a base plate assembly is used as a placement surface, and an operator is rotated.

Fig. 2 is a schematic view of the sander shown in fig. 1 when placed with the base plate assembly as a placement surface, without the operator's compartment rotated.

Fig. 3 is a schematic view of the sander shown in fig. 1, in which the sander is configured to rotate the operating member while being placed on the placement plate of the battery pack.

Fig. 4 is a schematic view of the sander shown in fig. 1, in which the sanding machine is placed with the placement plate of the battery pack as the placement surface, without rotating the operating member.

Fig. 5 is a schematic view of the whole structure of a sander according to a preferred embodiment of the present invention, without a battery pack.

Fig. 6 is a schematic diagram showing the gravity center position of the whole machine when the sander is provided with the first type battery pack.

Fig. 7 is a schematic diagram of the center of gravity of the sander without the battery pack.

Fig. 8 is a schematic diagram showing the gravity center position of the whole machine when the sander is provided with the second type battery pack.

Fig. 9 is a schematic diagram showing the gravity center position of the whole machine when the sanding machine is provided with a third type of battery pack.

Fig. 10 is a schematic diagram showing the structure of the center of gravity of the sander according to the present invention when the sander is placed with the placement plate of the battery pack as the placement surface.

Fig. 11 is a schematic view of the sander of fig. 5 with the main housing of the uninstalled portion.

Fig. 12 is a partially exploded view of the sander shown in fig. 5, with a first battery pack installed.

Fig. 13 is an exploded view of the sander shown in fig. 5.

Fig. 14 is a schematic view of a portion of the spacing mechanism of fig. 5.

Fig. 15 is an enlarged view of circle a in fig. 12.

Fig. 16 is a cross-sectional view of the mated state of the body and floor assembly of fig. 5.

FIG. 17 is a schematic view of the locking mechanism of FIG. 5;

fig. 18 is a schematic view of the structure of the operating member in fig. 5.

Fig. 19 is a cross-sectional view of the sander of the present invention with the operator in a closed position.

Fig. 20 is a cross-sectional view of the sander according to the present invention in another state, with the operating member in an open state.

Fig. 21 is a schematic structural view of another sander according to the present invention, in which the sanding sole plate is used as a placement plane.

Fig. 22 is a schematic view of the sander of fig. 21 in another view, with the placement plate as a placement plane.

Detailed Description

The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.

Referring to fig. 5, 11 and 12, the polishing tool in the present embodiment is exemplified by a multifunctional sander 100 (hereinafter referred to as sander 100), the sander 100 can replace different base plate assemblies 20, and the sander 100 includes a main body 10, a base plate assembly 20 detachably disposed below the main body 10, and an operating member 30 rotatably disposed on the main body 10. Referring to fig. 1, the direction a-a is the up-down direction of the sander 100, wherein the position of the base plate assembly 20 is defined as the lower part of the entire sander 100. The main body 10 includes a motor 11, an intermediate shaft 12 offset to one side of the motor 11, a main housing 13 for housing the motor 11 and the intermediate shaft 12, and a grip housing 14 provided at an end of the main housing 13 remote from the motor 11. The floor assembly 20 is mounted to the underside of the intermediate shaft 12, and specifically, the main body 10 is coupled to the floor assembly 20 via the intermediate shaft 12 and a threaded rod 41 (see fig. 12) disposed within the intermediate shaft 12, and the principle of the specific coupling of the main body 10 to the floor assembly 20 will be described later. The motor 11 drives the shoe assembly 20 to move so that the shoe assembly 20 performs a sanding operation, the shoe assembly 20 having a sanding shoe 221 for contacting a work surface (not numbered) to perform the sanding operation. In the present embodiment, the main housing 13 and the holding housing 14 are injection molded, and the main housing 13 and the holding housing 14 are formed as an integral structure and are divided into two halves along the longitudinal direction of the sander 100, that is, the main housing 13 is composed of two half housings that are substantially symmetrical. The holding shell 14 and the main shell 13 form a shell (not numbered) of the sander 100, the holding shell 14 is disposed at one end of the main shell 13 near the intermediate shaft 12, the holding shell 14 and the main shell 13 are disposed at an angle, in this embodiment, the holding shell 14 includes a holding handle 141 for holding and a holding cavity 142 for holding to bend and stretch fingers, the holding handle 141 is located at an upper side of the holding cavity 142, i.e. the holding handle 141 is located at a side far from the base plate assembly 20 in the a-a direction. The grip housing 14 is disposed at an angle of substantially 90 degrees with respect to the main housing 13 (the term "angle" as used herein refers to an angle between an extending direction of the grip handle 14 and an axial extending direction of the main housing 13 along the axis X1 of the motor 11). The axis X0 of the intermediate shaft 12 is spaced from the axis X1 of the motor 11, and the motor 11 and the grip housing 14 are distributed on both sides of the intermediate shaft 12.

Referring to fig. 6, in order to conveniently supply power to the main body 10, a power supply assembly is disposed on a side of the grip housing 14 away from the main housing 13, and the power supply assembly and the motor 11 are disposed on both sides of the intermediate shaft 12. The axis X0 of the intermediate shaft 12 and the axis X1 of the motor 11 are arranged at intervals, and the motor 11 and the energy supply assembly are arranged on two sides of the intermediate shaft 12, so that the gravity center of the whole sander 100 is prevented from being deviated to one side, the gravity center of the sander 100 can be closer to the vicinity of the intermediate shaft 12 when the sander works, and the base plate assembly 20 has small vibration and more comfortable operation when the sander works; and the polishing tool is easy to put in a static state, so that the polishing tool is prevented from toppling over. It is understood that the power supply assembly may be powered by ac or dc power, such as a battery assembly or a battery pack. In this embodiment, a power supply mode in which the power supply assembly adopts a battery pack is specifically described as an example. The end of the grip housing 14 remote from the main housing 13 in this embodiment is provided with a battery pack mounting portion 17 of the battery pack 16. Referring specifically to fig. 1, the battery pack mounting portion 17 is provided with a guide rail 171 for mounting the battery pack 16, and an electrode tab 172 electrically connected to the battery pack 16. It will be appreciated that the battery pack 16 is provided with guide grooves (not shown) for mating with guide rails of the battery pack mounting portion 17 and electrode tab slots (not shown) for mating with electrode tabs, although it will be appreciated that the electrode tabs 172 may be provided on the battery pack while the electrode tab slots are provided on the battery pack mounting portion 17.

Referring to fig. 7, when the battery pack 16 is not mounted to the main body 10, the center of gravity G3 of the main body 10 is located between the axis X1 of the motor 11 and the axis X0 of the intermediate shaft 12. Referring to fig. 6, when the battery pack 16 is mounted on the main body 10 and the mass of the battery pack 16 is greater than 333g, the center of gravity of the sander 100 gradually moves from a position between the axis X1 of the motor 11 and the axis X0 of the intermediate shaft 12 toward the battery pack 16 as the mass of the battery pack 16 increases. Referring to fig. 8, when the battery 16 is included with a mass between 333g and 630g, the center of gravity of the sander 100 is located on the side of the intermediate shaft 12 away from the motor 11 and the projection in the direction of the sanding floor 221 of the floor assembly 20 falls within the sanding floor 221. Referring to fig. 9, when the mass of the battery pack 16 is 630g or more, the center of gravity of the sander 100 is located on the side of the intermediate shaft 12 away from the motor 11, and the projection of the center of gravity of the sander 100 in the direction of the sanding floor 221 of the floor assembly 20 falls outside the area of the sanding floor 221 of the floor assembly 20, the sander 100 is tilted toward the battery pack 16 side when the sander 100 is placed with the surface of the sanding floor 221 as the placement surface.

Since the motor 11 and the grip housing 14 are located on both sides of the intermediate shaft 12, and the power feeding unit (battery pack 16) and the main housing 13 are located on both ends of the grip housing 14, the corresponding motor 11 and battery pack 16 are provided on both ends of the sander 100, respectively, and the motor 11 is regarded as a front end and the battery pack 16 is regarded as a rear end when viewed from fig. 6. Since the main weight of the sander 100 comes from the motor 11 and the energy supply assembly (the battery pack 16), the center of gravity of the motor 11 and the center of gravity of the energy supply assembly (the battery pack 16) have a large influence on the center of gravity of the sander 100, for example, the center of gravity of the motor 11 is defined as G1, the center of gravity of the energy supply assembly (the battery pack 16) is defined as G2, the center of gravity of the sander 100 is defined as G3, the distance from the center of gravity G1 of the motor 11 to the center of gravity of the sander 100 is defined as a1, the distance from the center of gravity G2 of the energy supply assembly (the battery pack 16) to the center of gravity of the sander 100 is defined as a2, in order to ensure the balance of the sander, prevent toppling during standing, and bring about good operation experience, the center of gravity of the sander 100 satisfies the following formula (the formula is named as "center formula"): the weight of motor 11 a1 is equal to or about equal to the weight of energizing assembly 16 (battery pack 16) a2.

In this embodiment, the battery pack 16 is detachably connected to the grip housing 14. It will be appreciated that the battery pack 16 may also be a non-removable energy storage battery pack 16. Since the battery pack 16 is removable, and typically, the sander 100 can be assembled with different battery packs 16 as required by the operating time. Typically the mass selection of the battery pack 16 is between 333g and 630 g; the battery pack 16 is configured to have any one of a voltage of 20V, a capacity of 2Ah, a voltage of 20V, a capacity of 4Ah, and a voltage of 20V, a capacity of 6 Ah. Because the battery pack 16 is changeable in weight, and the sander 100 is basically fixed in weight of the motor 11 after shipment, the center of gravity of the sander 100 is not fixed depending on the size of the capacity of the battery pack 16 mounted, as shown in fig. 7, the center of gravity G3 of the sander 100 falls near the center of gravity G1 of the motor 11 when the battery pack 16 is not mounted in the whole machine, as shown in fig. 6, the center of gravity G3 of the sander 100 falls at a position on the rear side of the intermediate shaft 12 when the battery pack 16 is mounted in the whole machine (for example, the battery pack 16 of 20V, 4Ah is about 630G), and as shown in fig. 8, the center of gravity G3 of the sander 100 falls again at a position further rearward than the intermediate shaft 12, and the center of gravity G3 of the sander 100 is proportional to the capacity of the battery pack 16 as a whole. However, when the battery pack 16 reaches 6Ah or more, the center of gravity G3 of the sander 100 will be gradually located away from the intermediate shaft 12, thereby creating an unbalanced condition of the machine, which is prone to a rollover condition as shown in fig. 9. In this way, damage to the tool or the work surface will occur. Therefore, instructional advice on selecting the battery pack 16 can be given by the "gravity center formula".

In order to more precisely set the position of the center of gravity G3 of the sander 100, a range of positions of the center of gravity of the sander 100 needs to be defined, when the sanding bottom plate 221 is taken as a supporting plane, and when the center of gravity G3 of the sander 100 falls in the sanding bottom plate 221 taken as a supporting plane B-B, the sander can maintain a balanced state, and presents a normal placing condition without toppling, as shown in fig. 6 to 8, while when the center of gravity G3 of the sander 100 falls outside the sanding bottom plate 221 taken as a supporting plane B-B, the sander cannot maintain balance, and presents a toppling and side turning condition, as shown in fig. 9, which is unfavorable for a user to replace the bottom plate assembly 20 of the sander. In this embodiment, the battery pack 16 includes the placement plate 161 disposed away from the motor, and in actual use, the placement plate 161 may also be used as a supporting surface, and when the placement plate 161 of the battery pack 16 is used as a supporting plane, as shown in fig. 10, the center of gravity G3 of the sander 100 still falls within the range of the supporting plane (placement plate 161) of the battery pack 16, and the entire machine may still be placed in a balanced state.

Referring to fig. 6 and 7, in order to facilitate the operation and to be suitable for the hand-held operation, the main portion of the main body 10 in this embodiment is preferably sized in such a way that the distance K1 from the end of the main housing 13 remote from the grip housing 14 to the end connected to the grip housing 14 is between 70mm and 80 mm. The distance K2 from the end of the holding chamber 142 near the main housing 13 to the end of the holding chamber 142 near the battery pack mounting portion 17 (i.e., the length of the holding chamber 142) is between 90mm and 105mm for easy holding. The distance K3 between the end of the holding chamber 142 near the battery pack mounting portion 17 and the side of the battery pack mounting portion 17 away from the main casing 13 is between 25mm and 35mm to facilitate fixing the battery pack 16 and to make the strength of the battery pack mounting portion 17 appropriate. Thus, the end of the main housing 13 of the main body 10 means that the distance of the end of the main body 10 remote from the main housing 13 is between 185mm and 220mm, i.e. the overall length of the main body 10 is between 185mm and 220 mm.

Preferably, K1 is between 71.3mm and 78.8mm, K2 is between 90.3mm and 99.8mm, and K3 is between 28.5mm and 31.5mm, i.e. the length of the body portion 10 is between 190.1mm and 210 mm. More preferably, K1 is 75mm, K2 is 95mm, and K3 is 30mm.

Referring to fig. 11 to 13, in the present embodiment, an axis X0 of the intermediate shaft 12 is parallel to an axis X1 of the motor 11, and the main body 10 includes a torque output portion for transmitting power of the motor 11 to the floor assembly 20 and a transmission portion 15 for transmitting power of the motor 11 to the torque output portion, so that the floor assembly 20 is moved by the motor 11 to perform a polishing operation. The constitution of the transmission portion 15 in the present embodiment will be described first. The transmission part 15 includes a first transmission wheel 151 coaxially provided with the motor 11 and driven to rotate by the motor 11, and a second transmission wheel 152 coaxially provided on the intermediate shaft 12 and driven by the first transmission wheel 151. The rotation axis of the first transmission wheel 151 and the rotation axis of the second transmission wheel 152 are spaced apart. In order to reduce noise and vibration of the first and second driving wheels 151 and 152 at the time of torque transmission, it is preferable that power transmission is performed between the first and second driving wheels 151 and 152 by means of a driving belt 153. In order to make the transmission between the transmission belt 153 and the first transmission wheel 151 and the second transmission wheel 152 stable, and avoid slipping, etc., the transmission end surfaces of the first transmission wheel 151 and the second transmission wheel 152 in this embodiment are respectively provided with ratchet teeth (not numbered), and corresponding ratchet teeth (not numbered) are provided on the transmission surface (not numbered) of the transmission belt 153 and the transmission surface (not numbered) of the transmission belt. In this embodiment, the intermediate shaft 12 is used to support the second transmission wheel 152, and in other embodiments, the second transmission wheel 152 of the transmission part 15 may not be disposed on the intermediate shaft 12, and may be disposed directly in the main housing 13 or on another shaft supported in the housing. In the present embodiment, the intermediate shaft 12 is vertically provided in the main casing 13 by upper and lower pairs of bearings (not numbered) so that the intermediate shaft 12 can rotate relative to the main casing 13. In this embodiment, the intermediate shaft 12 and the second driving wheel 152 may be connected by interference fit or key, so that the intermediate shaft 12 may be driven to rotate relative to the main housing 13 when the second driving wheel 152 rotates, in other embodiments, the intermediate shaft 12 may be disposed so as not to rotate relative to the main housing 13, may be fixed on the main housing 13, and the connection between the intermediate shaft 12 and the second driving wheel 152 may be fixed by a bearing or the like so that the second driving wheel 152 may rotate relative to the intermediate shaft 12.

Since the base plate assembly is a replaceable component, it may be any one of a plate sand base plate assembly, a round sand base plate assembly (see the base plate assembly schematically shown in fig. 2-3), and a special-shaped sand base plate assembly, wherein the plate sand base plate assembly includes a 1/4 sand base plate assembly, a 1/3 sand base plate assembly (see the base plate assembly of fig. 9), and a triangular sand base plate assembly or a special-shaped sand base plate assembly, etc., that is, the base plate assembly requiring limiting the rotation movement of the polishing base plate when the base plate assembly 20 works is called a plate sand base plate assembly. The operator can selectively connect the base plate assembly 20 with the main body 10 according to different polishing requirements. However, regardless of the base plate assembly 20, referring to fig. 1, the base plate assembly 20 includes a bearing 21, a base plate housing 22 located outside the bearing 21, and a base plate rotating shaft 23 connected to the inside of the bearing 21. The base plate housing 22 includes a base plate bracket (not numbered) fixed to the outer ring of the bearing 21 and a sanding base plate 221 positioned below the base plate bracket, and sandpaper may be installed below the sanding base plate 221 to complete a sanding operation by the sandpaper. If the base plate assembly 20 is a round sand base plate assembly, the polishing base plate is round; if the base plate component is a plate sand base plate component, the polishing base plate is rectangular, triangular or other non-return side shapes. The sanding sole plate of the circular sanding sole plate assembly is revolved while being sanded, and at the same time, the sanding sole plate is rotated by the combined action of the bearing 21 and the sole plate rotating shaft 23, that is, the sanding sole plate is rotated and revolved in orbital motion, so that the sanding sole plate 221 can be mounted to the main body part 10 when an operator needs to remove a large amount of grinding material. Referring to fig. 12, after the main body 10 and the base assembly 20 are assembled, the base shaft 23 is coaxial with the axis of the intermediate shaft 12, the base shaft 23 is driven to rotate by the second driving wheel 152, the bearing 21 is located between the base shaft 23 and the base support, the outer ring of the bearing 21 is fixed to the base support, and the inner ring of the bearing 21 is fixed to the base shaft 23, so that the base shaft 23 can rotate relative to the base support. In this embodiment, the base plate rotating shaft 23 is an eccentric rotating shaft, and preferably, the base plate rotating shaft 23 includes an eccentric shaft section (not numbered) to drive the base plate bracket and the polishing base plate 221 fixedly connected to the base plate bracket to move by the rotation of the eccentric shaft section. It will be appreciated that, since the base plate support is fixedly connected to the polishing base plate 221, the eccentric shaft section can drive the polishing base plate 221 to swing regularly when rotating relative to the base plate support, so as to achieve polishing operation. Further, since the eccentric amount e1 exists in the axis of the eccentric shaft section with respect to the axis X0 of the intermediate shaft 12, the counterweight 24 is provided on the base plate rotating shaft 23 in order to reduce the shake caused by the eccentric amount e 1.

Referring to fig. 12 and 13, it should be noted that, the polishing base 221 is a board sand base assembly, and if the polishing base 221 is revolved and rotated under the action of the base rotating shaft 23, four corners of the rectangular polishing base 221 rotating at high speed are liable to be dangerous, so the sander 100 further includes a limiting mechanism 25 for limiting the rotation of the polishing base 221.

Referring to fig. 13 and 14, the stopper mechanism 25 is preferably fixed to the main body 10, and the stopper mechanism 25 includes a stopper base plate 251 and stopper legs 252 provided on the stopper base plate 251, the stopper legs 252 extending toward the main housing 13. The number of the limiting pins 252 is plural, each limiting pin 252 includes a plurality of flexible columns (not numbered), the limiting pins 252 are detachably fixed on the main housing 13 of the main body 10 through screws and the like, the plurality of flexible columns of each limiting pin 252 enclose into a hollow through hole and the through hole penetrates through the limiting substrate 251, and the hollow through hole enclosed by the plurality of flexible columns of the limiting pins 252 is a limiting hole 253. Each of the positioning pins 252 is provided with a mounting plate 254 at one end thereof away from the positioning base plate 251, and the mounting plate 254 is provided with a mounting hole (not numbered) for being engaged with a fastener such as a screw, so that an operator can screw the fastener such as a screw into the mounting hole 253 from below the positioning base plate 251. In this embodiment, the base plate assembly 20 is provided with a limiting post 27, and the limiting post 27 extends from the base plate housing 22 toward the main body 11, that is, toward the limiting leg 252 located on the main body 10, so that when the board sand base plate or the profiled sand base plate is mounted on the main body 10, the limiting post 27 can be smoothly inserted into the limiting hole 253 to prevent the grinding base plate 221 from rotating. The stopper posts 27 are formed protruding from the floor housing 22 toward the main body 10. In this embodiment, an elastic element 255 is disposed between the limiting post 27 and the limiting leg 252, and the elastic element 255 is disposed at one end of the limiting hole 253 near the limiting substrate 251. The elastic member 255 in this embodiment includes an elastic member 2551 located between the floor housing 22 and the opening of the stopper hole 253 to isolate the floor housing 22 and the stopper mechanism 25 from vibration in the up-down direction; the elastic member 255 further includes a second elastic member 2552 positioned between the stopper post 27 and the side wall of the stopper hole 253 to isolate vibration of the stopper post 27 and the stopper hole 253 in the radial direction, that is, vibration of the bottom plate housing 22 and the stopper mechanism 25 in the radial direction. Since the base plate assembly 20 of the sander 100 can be varied, the sanding base plate 221 provided with the spacing mechanism 25 includes another base plate assembly (also referred to as mouse sand or profiled sand) having a sanding base plate that is approximately iron-shaped, in addition to the 1/3 sand shape and 1/4 sand shape of the sanding base plate 221 described above. By attaching the above-described stopper mechanism 25 to the main body 10, cost can be saved.

When the limiting mechanism 25 is disposed on each base plate assembly 20, since the number of the base plate assemblies 20 to which the limiting mechanism 25 is mounted is large, a large number of limiting mechanisms are required, and the cost is high. In addition, since the fit between the elastic member 225 and the limiting hole 253 is mostly interference fit, the elastic member 225 is difficult to install, and thus, the greater the number of elastic members 225 installed, the more difficult to assemble. When the base plate assembly 20 is a sand base plate assembly, the spacing post 27 may be omitted, so that in practice, the spacing leg 252 may be selectively coupled to the base plate assembly 20 to limit the rotational movement of the sanding base plate 221 of the base plate assembly 20 about the axis X0 of the intermediate shaft 12. Referring to fig. 12 and 13, in the present embodiment, since the distance between the limiting leg 252 and the axis X0 of the intermediate shaft 12 is constant, when the motor 11 and the grip housing 14 are disposed on both sides of the axis X0 of the intermediate shaft 12 in the present embodiment, the overall mechanism of the sander 100 is more compact than the prior art.

Indeed, in other embodiments, the limiting pins may be disposed on the base plate assembly, and if the limiting pins are disposed on the base plate assembly, only a space for accommodating the limiting pins may be reserved on the main body portion, and when the limiting pins are specifically used, the limiting pins may be directly disposed on the base plate assembly, or the limiting mechanism in this embodiment may be mounted on the base plate assembly to form an integral structure; alternatively, the spacing leg may be separately provided as an independent component, for example, the spacing mechanism in this embodiment is provided as a separate component, so that the spacing mechanism is not included in the main body portion or the base plate assembly, and similarly, a space for accommodating the spacing leg is reserved in the main body portion, and the spacing post is optionally reserved on the base plate assembly (when the round sand base plate assembly is used, the spacing post may be optionally not provided, and when the base plate assembly is used as in this embodiment, the spacing post is reserved), and when the base plate housing of the base plate assembly needs to be limited to perform autorotation movement about the intermediate shaft axis, the spacing mechanism is provided between the main body portion and the base plate assembly, that is, the spacing leg is installed between the main body portion and the base plate assembly.

As described above, the torque output portion 71 is configured to transmit the driving force of the motor 11 to the base plate assembly 20 so that the base plate assembly 20 performs the polishing work, and in this embodiment, as shown in fig. 12 and 13, the torque output portion 71 is disposed between the base plate assembly 20 and the transmission portion 15, that is, the torque output portion 71 is disposed between the second transmission wheel 152 and the base plate assembly 20. The base plate assembly 20 is provided with a torque input portion 72 coupled with the torque output portion 71, so that the torque of the second transmission wheel 152 is transmitted to the base plate assembly 20, and the driving force of the motor 11 is transmitted to the base plate assembly 20. In the present embodiment, the torque output portion 71 is directly fixed to the second transmission wheel 152 to achieve synchronous rotation. When the base plate assembly 20 is mounted to the main body 10, the torque output portion 71 cooperates with the torque input portion 72 to effect rotation of the base plate shaft 23. Referring to fig. 13, in the present embodiment, the torque output portion 71 is preferably a first engagement tooth fixedly connected to the second driving wheel 152 and uniformly disposed in the circumferential direction, and the torque input portion 72 is preferably a second engagement tooth uniformly disposed outside the rotating shaft 23 of the base plate and capable of being engaged with the first engagement tooth. Specifically, referring to fig. 11 and 12, a fan 63 is fixed at the lower end of the intermediate shaft of the second driving wheel 152, and the fan 63 includes a ring-shaped fan base 630, a first fan blade (hereinafter referred to as a second fan 631) extending from the side surface of the fan base 630 toward the second driving wheel 151, and a second fan blade (hereinafter referred to as a third fan 632) extending from the other side surface of the fan base 630 toward the bottom plate assembly 20. The first engaging teeth are a plurality of protruding teeth arranged on the second driving wheel 152 and fixedly connected with the second driving wheel 152 or arranged on the lower end surface of the insert 64 which is fixedly connected with the fan 63 and arranged on the inner periphery of the fan 63, and the second engaging teeth are a plurality of protruding teeth which extend outwards in radial direction at the upper end of the bottom plate rotating shaft 23. It will be appreciated that the torque output 71 and the torque input 72 may be provided in other arrangements as long as a transmission of rotational movement (torque transmission) between the motor 11 and the base plate shaft 23 is enabled. In this embodiment, since the intermediate shaft 12 is preferably rotatable, the insert 64 is fixedly sleeved on the outer side of the intermediate shaft 12 to drive the intermediate shaft 12 to rotate. That is, in the present embodiment, the second transmission wheel 152 transmits the driving force of the motor 11 to the insert 64, the insert 64 transmits torque to the floor assembly 20 through the rotation transmission member, and the insert 64 simultaneously transmits the driving force of the motor 11 to the intermediate shaft 12 to rotate the intermediate shaft 12.

The above-mentioned rotation transmission member only realizes torque transmission, but the base plate assembly 20 needs to be capable of rotating under the drive of the rotation transmission member of the main body 10, and also needs to be connected with the main body 10 in an axial direction to realize the installation and the disassembly between the base plate assembly 20 and the main body 10. The axial fixation of the floor assembly 20 relative to the body portion 10 is achieved by providing a connection assembly.

The connection assembly includes a first connection member provided at one of the body portion 10 and the floor shaft 23, and a second connection member provided at the other of the body portion 10 and the floor shaft 23, which is separated or axially connected with the first connection member after being rotated with respect to the first connection member, thereby achieving the installation or separation of the floor assembly 20 from the body portion 10 (even though the floor assembly 20 is inseparably connected with the body portion 10). Preferably, for ease of operation, the second connector is driven to rotate relative to the first connector by the operating member 30. The first connecting member may be a fixing hole provided at one of the intermediate shaft 12 and the bottom plate rotating shaft 23; the second coupling member may be a fastener coupled to the other of the intermediate shaft 12 and the floor shaft 23. Referring to fig. 12 and 13, in this embodiment, specifically, the fastener is a threaded rod 41, an external thread 411 is provided below the threaded rod 41, a fixing hole 412 is provided on the bottom plate rotating shaft 23, an internal thread (not numbered) is formed on at least a portion of an inner wall of the fixing hole 412, and an axial connection between the bottom plate assembly 20 and the main body 10 is achieved by matching the external thread 411 of the threaded rod 41 with the internal thread of the bottom plate rotating shaft 23, and the operating member 30 operatively drives the threaded rod 41 to rotate relative to the fixing hole 412 provided with the internal thread to achieve the axial connection between the threaded rod 41 and the bottom plate rotating shaft 23, that is, the axial connection between the main body 10 and the bottom plate assembly 20 is achieved. It will be appreciated that in other embodiments it is possible to provide the threaded rod 41 with a hollow threaded rod in the section that connects to the base plate shaft 23, and to provide the internal thread on the inner wall of the hollow threaded rod and the external thread on the base plate shaft 23.

Referring to fig. 12 and 15, in this embodiment, in order to facilitate placement of the threaded rod 41, the intermediate shaft 12 is provided as a hollow shaft, the threaded rod 41 is at least partially disposed within the hollow shaft, and in order to prevent the threaded rod 41 from falling out of the hollow shaft, a flange 413 is provided at an upper end of the threaded rod 41. In this embodiment, in order to ensure the coaxiality of the main body 10 and the polishing portion 12, that is, the coaxiality between the rotation axes of the threaded rod 41 or the intermediate shaft 12 and the base plate rotating shaft 23 to reduce the vibration of the sander 100 during operation, the base plate rotating shaft 23 is further provided with a second supporting portion 414, preferably, the second supporting portion 414 is provided with a groove extending along the rotation axis direction, and a first supporting portion 415 having substantially the same outer diameter as the groove is formed below the intermediate shaft 12 for extending into the groove. Referring to fig. 16, the intermediate shaft 12 extends to a length L1 of the fixing hole 412, that is, the axial dimension of the first supporting portion 415 is L1, and L1 is between 4mm and 30mm, preferably L1 is between 11.25mm and 13.75mm, and more preferably L1 is 12.5mm. The first support portion 415 and the second support portion 414 (groove) are coupled with a small gap, that is, the outer diameter of the first support portion 415 is substantially the same as the outer diameter of the second support portion 414 (groove), and hereinafter referred to as a coupling diameter D1, the coupling diameter D1 is between 7mm and 12mm, preferably the coupling diameter D1 is between 8.55mm and 10.45mm, and more preferably the coupling diameter D1 is 9.5mm. It will be appreciated that when the mating diameter D1 is a specific value, the larger the mating length L1, the better the mating effect, i.e. the better the coaxiality will be. But the longer L1, the higher the overall height. In this embodiment, in order to make the mating length smaller, the coaxiality of the whole machine can still be well ensured, the main body 10 is provided with an abutting end face 416 abutting against the upper end face of the bottom plate rotating shaft 23, and the diameter D2 of the abutting end face 416 is larger than D1. In the present embodiment, the abutment end surface 416 is an end surface where the torque input portion 71 abuts against the bottom plate rotation shaft 23, and it is understood that in other embodiments, the abutment end surface 416 may be an end surface fixedly connected to the torque output portion 71 and abutting against the bottom plate rotation shaft 23. In this embodiment, the ratio of the mating length L1 to the mating diameter D1 is reduced to 0.33 by adopting the large end face for the mating, which can ensure that the mating length L1 is reduced when D1 is a specific value, and of course, it can be understood that the larger the value of L1/D1 is, the more favorable the stability of coaxiality is under the premise of ensuring the large end face of D2.

To enhance the mating between the second connector and the first connector, the connector assembly further includes a first resilient member 42 disposed at one end of the second connector to provide a force to the second connector in the direction of the first connector. The first elastic member 42 is sleeved at the end of the second connecting member. Referring to fig. 12 and 15, in this embodiment, the first elastic member 42 is a spring, and in this embodiment, since the first connecting member is the threaded rod 41, for better assembly, the first elastic member 42 can be sleeved on the end of the threaded rod 41 and close to the operating member 30, so that the first elastic member 42 always provides a biasing force to the threaded rod 41 downward along the axis X0, so as to facilitate better threaded engagement between the lower end of the threaded rod 41 and the bottom plate rotating shaft 23. The operating member 30 has two states, an open state and a closed state. When the sander 100 is not in the working state and the base plate assembly 20 needs to be replaced, the operating member 30 can rotate relative to the main casing 13 when the operating member 30 is set to the open state, and the operating member 30 drives the threaded rod 41 to rotate. When the operating member 30 is closed, the threaded rod 41 can rotate relative to the operating member 30. When the sander 100 is in the working state, the operating member 30 is in the closed state, the threaded rod 41 is free to rotate relative to the operating member 30.

When the threaded rod 41 is screwed to the bottom plate rotating shaft 23 through the operating member 30, the rotation of the threaded rod 41 drives the bottom plate rotating shaft 23 to rotate, and the rotation of the bottom plate rotating shaft 23 drives the intermediate shaft 12 to rotate through the torque output portion 71 and the torque input portion 72, so that the external thread 411 of the threaded rod 41 cannot be engaged with the internal thread of the bottom plate rotating shaft 23. Therefore, when the threaded rod 41 is screwed to the floor shaft 23 by the operating element 30, the rotation of the intermediate shaft 12 must be restricted. In this embodiment, the sander 100 further includes a locking assembly that can limit rotation of the intermediate shaft 12 to achieve mating or unmating of the first connector and the second connector. Referring to fig. 12, 15 and 17, the locking assembly includes a first locking member 1181 movable relative to the main housing 13 but not rotatable, and a second locking member 1182 fixedly connected to or integrally provided with the intermediate shaft 12, wherein the first locking member 1181 is movable between a first position and a second position, and when the first locking member 1181 is located at the first position, the first locking member 1181 is engaged with the second locking member 1182, that is, the locking mechanism is in a locked state, and the intermediate shaft 12 is circumferentially locked. As can be seen from the above description, in this embodiment, since the second transmission wheel 152 is fixedly sleeved on the outer side of the intermediate shaft 12 to drive the intermediate shaft 12 to rotate, that is, the intermediate shaft 12 and the bottom plate rotating shaft 23 are connected in a non-rotatable manner, when the intermediate shaft 12 is locked, the bottom plate rotating shaft 23 is also locked, and cannot rotate circumferentially. Further, since the torque output portion 71 and the torque input portion 72 are engaged by the engagement teeth to transmit the torque, that is, the intermediate shaft 12 and the floor shaft 23 are not rotatable relative to each other in the circumferential direction, the floor shaft 23 is also locked in the circumferential direction after the intermediate shaft 12 is locked, and thus the threaded rod 41 is operatively rotated relative to the floor shaft 23. When the first locking member 1181 is located at the second position, the first locking member 1181 is separated from the second locking member 1182, that is, the locking mechanism is in an unlocked state, and the locking mechanism releases the circumferential lock of the intermediate shaft 12, so that the intermediate shaft 12 can rotate relative to the main housing 13. In this embodiment, the locking mechanism is specifically as follows: the locking member 1182 is a flange body fixed on the outer side of the intermediate shaft 12, wherein the flange body is provided with a stop groove 1810, the first locking member 1181 is an axially movable stop block, when the stop block moves axially upwards to a first position, the stop block is at least partially located in the stop groove 1810 to limit the intermediate shaft 12 to perform circumferential rotation, and when the stop block moves axially downwards to a second position, the stop block is separated from the stop groove 1810, and the intermediate shaft 12 can freely rotate. It will be understood that in other embodiments, the movement direction of the stop block may be along other directions, such as a radial direction or a direction at other angles to the axial direction, which will not be described herein. It will be appreciated that in other embodiments, the locking mechanism may lock the base plate shaft 23 in other ways, such as by limiting the rotation of the motor, or by directly limiting a component on the base plate shaft 23, so long as the rotation of the base plate shaft 23 is enabled.

In addition, the switching of the lock mechanism between the locked state and the unlocked state of the present embodiment is achieved by the operating member 30. When the operating element 30 is in the closed state, the operating element 30 axially abuts against the first locking element 1181 (stop block), the first locking element 1181 compresses the first elastic element 31 downwards, and therefore the first locking element 1181 is located at the second position below, the first locking element 1181 is separated from the second locking element 1182, and the locking mechanism is in the unlocked state; when the operating member 30 is switched from the closed state to the open state, the second locking member 1182 moves upward to the first position under the action of the first elastic element 31, the stopper is engaged with the stopper groove 1810, and the locking mechanism is in the locked state.

Referring to fig. 1 to 4, the operation member 30 of the present embodiment is rotatable relative to the main housing 13, the operation member 30 is located above the main body 10 and away from the base plate assembly 20, and the operation member 30 is operable to mount or separate the base plate assembly 20 from the main body 10 when the sander 100 is placed on the surface of the sanding base plate 211 (fig. 1 and 2) or the surface of the placing plate 161 (fig. 3 and 4), and in this embodiment, the operation member 30 is rotatable about the first rotation axis y to mount or separate the base plate assembly 20 from the main body 10. In this embodiment, when the operating member 30 rotates, the operating member 30 drives the intermediate shaft 12 to rotate, and the first rotation axis y of the operating member 30 overlaps the axis X0 of the intermediate shaft 12, see fig. 1, and the first rotation axis y of the operating member 30 is perpendicular to the surface of the polishing base 211, see fig. 3, and the first rotation axis y of the operating member 30 is parallel to the surface of the placing plate 161.

Referring to fig. 11, 15 and 18, the operating member 30 includes an operating handle 32 and a base 33 for being held by an operator, and the operating handle 32 is pivotally provided to the base 33 by a pivot shaft to switch between a first operating position and a second operating position. Preferably, the pivot shaft includes a first pivot shaft 341 fixed to the operating handle 32 and a second pivot shaft 342 fixed to the base 33, the base 33 is provided with a first chute 331 for the first pivot shaft 341 to rotate, and the operating handle 32 is provided with a second chute (not shown) for the second pivot shaft 342 to move. The operation handle 32 is switchable between a second operation position (second operation position like the state of fig. 11) of the closed state and a first operation position (first operation position like the state of fig. 18) of the open state. When the operating handle 32 is located at the second operating position, the operating handle 32 extends at least partially out of the main housing 13; when the operating handle 32 is in the first operating position, the operating member 30 does not exceed the outer contour of the main casing 13; that is, when the operating handle 32 is in the second operating position, the operating handle 32 and the grip handle 141 are positioned substantially on the same horizontal line; when the operating handle 32 is in the first operating position, the operating handle 32 is disposed at an angle to the grip handle 141. The operating handle 32 is provided with an abutment surface 35 for abutting against the first locking member 1181. Referring to fig. 15, when the operating handle 32 is in the second operating position (in the closed state), the abutment surface 35 of the operating handle 32 abuts against the first locking member 1181 and further abuts against the first elastic member 31 by the first locking member 1181, so that the first elastic member 31 is compressed, the first locking member 1181 is located in the second position below, and at this time, the intermediate shaft 12 can rotate together with the second transmission wheel 152 under the driving of the motor 11 after the power switch (not shown) is started; when the operating handle 32 is moved from the second operating position (closed state) shown in fig. 7 (fig. 15, 19) to the first operating position (open state) (fig. 18, 20), the abutment surface 35 moves upward and the first locking member 1181 moves upward by the first elastic member 31, until the first locking member 1181 moves upward to the first position, the intermediate shaft 12 is locked, and the intermediate shaft 12 is non-rotatable with respect to the main casing 12.

As described above, the operation handle 32 can be used to rotate the threaded rod 41, so that the sander 100 is simple to operate, and the structure of the sander 100 is also simple. The cooperation of the operating element 30 with the threaded rod 41 is as follows: when the operating member 30 is in the closed state, i.e. the first operating handle 32 is in the second operating position and the first locking member 1181 is in the second position, the operating handle 32 cannot rotate the threaded rod 41; when the operating handle 32 is rotated from the second operating position to the first operating position about the pivot axis, the first locking member 1181 becomes positioned at the first position, the intermediate shaft 12 is locked, and the operating handle 32 can rotate the threaded rod 41 about its axis (i.e., the axis of the intermediate shaft 12). In this embodiment, the threaded rod 41 is provided with a transmission element, referring to fig. 15, and the transmission element is a second lug 417 disposed on the threaded rod 41, and the operating member 30 includes a first lug 36 corresponding to the second lug 417, and when the operating handle 32 is in the first operating position, the first lug 36 is engaged with the second lug 417, so that the operating handle 32 can drive the threaded rod 41 to rotate relative to the main housing 13, so that the base plate assembly 20 can be connected to or disconnected from the main body 10.

In order to improve the operability of the operating member 30 and to improve the gripping comfort, when the operating handle 32 is in the second operating position (closed state), the length L3 from the trailing end 321 of the operating handle 32 away from the first rotation axis y to the first rotation axis y is between 55mm and 110mm (see fig. 19); more preferably, when the operating handle 32 is in the first operating position (open state), a distance H from the rear end of the operating handle 32 away from the first rotation axis y to the upper end face of the main casing 13 (here, the upper end face refers to a plane corresponding to the highest point of the casing outer contour) is between 20mm and 40mm (see fig. 20).

It should be noted that, the method for disassembling the base plate assembly 20 of the sanding machine 100 includes the following steps: placing the sander 100 with the placement plate 161 as a bottom plane; rotating the operating member 30 about the first rotation axis y to disconnect the floor assembly 20 from the body portion 10. The method for installing the base plate assembly 20 of the sander 100 comprises the steps of: placing the sander 100 with the placement plate 161 as a placement surface; aligning the first connector (threaded rod 41) with the second connector (fixing hole 412); and rotating the operation member 30 about the first rotation axis y until the first connection member (threaded rod 41) and the second connection member (fixing hole 412) complete the connection operation.

Referring to fig. 5 and 11, in the present embodiment, a first air inlet 131, a second air inlet 132 and a first air outlet 133 are formed on the main housing 13. The sander 100 in this embodiment is provided with a first fan 61 for cooling the motor 11, the first fan 61 being arranged coaxially with the motor 11, and is located at one end of the motor 11 near the base plate assembly 20, and the first fan 61 is located below the stator and rotor of the motor 11. In this embodiment, in order to reduce the length of the sander 100 in the horizontal direction, the second fan 631 and the first fan 61 are disposed in a vertically offset manner, that is, the first fan 61 and the second fan 631 are not at the same horizontal height, and preferably, the second fan 631 is located below the first fan 61 in the height direction. The second fan 631 serves to cool the second driving wheel 152. In this embodiment, a first cooling air path and a second cooling air path are formed in the sander 100, and the first cooling air path and the second cooling air path share the same first air outlet 133, at least part of the first air inlet 131 is close to the motor, at least part of the first air outlet 133 is close to the second fan 631, in this embodiment, at least part of the first air inlet 131 is located above the stator and the rotor of the motor 11, and at least part of the first air outlet 133 is located on the main casing 13 in the area corresponding to the second fan 631. The first cooling air path sequentially passes through the first air inlet 131, the motor 11, the transmission part 15 and the first air outlet 133, and the second cooling air path sequentially passes through the second air inlet 132, the transmission part 15 and the first air outlet 133. Specific: the external air flows through the motor 11 and the transmission part 15 from the first air inlet 131 near the motor 11 under the action of the first fan 61, and flows out from the first air outlet 133 near the second fan 631 under the action of the second fan 631, that is, the air flows stably from the first air inlet 131 and the second air inlet 132 into the main casing 13, moves to the first fan 61 through the motor 11, and is guided out of the main casing 13 from the first air outlet 133 through the transmission part 15 and then the second fan 631. In this embodiment, since the first cooling air path passes through the motor 11 and then passes through the transmission portion 15, when the cooled air reaches the transmission portion 15, particularly, when the cooled air reaches the second transmission wheel 152, the temperature of the air is relatively high compared with the temperature of the air at the position of the motor 11, so that the cooling efficiency is relatively low, and therefore, in this embodiment, a second cooling air path for cooling the second transmission wheel 152 is also required to further reduce the temperature of the transmission portion 15. The present embodiment communicates the first cooling air path for cooling the motor 11 with the second cooling air path mainly for cooling the second driving wheel 152.

The sander 100 further includes a dust collecting device 40 provided on the main body, and a dust collecting air passage is provided in the sander 100, and sucks in and discharges the air and dust from the underside of the sanding bottom plate 221 into the dust collecting device 40. The third fan 632 shares the same hub with the second fan 631, in other words, the second fan 631 is above the hub and the third fan 632 is below the hub. The air inlet (not numbered) of the dust collection air path is located on a side of the polishing base 221 facing the sand paper and the sand paper, and the air outlet (not numbered) of the dust collection air path is a dust collection outlet of the dust collection device 40 which is communicated with the third fan 63, so as to blow the chips and dust generated in the polishing part 12 during polishing into the dust collection device 40 through the third fan 63, and the dust collection device 40 can be a dust collection bag or a dust collection box. It will be appreciated that the air duct may be arranged in other manners, such as only one fan is used to cool the motor 11 and the transmission portion 15, but the fan combination and the air duct are arranged in the present embodiment with the following two advantages compared to the case where only one fan is used to cool the motor 11 and the transmission portion 15: 1. the cooling effect is better, and 2, the size is reduced. Because, if only one fan is used to cool the motor and the driving member, the cooling effect of the driving member will be reduced because the air after cooling the motor cools the driving member, in addition, if a fan with a larger size is needed to achieve a better cooling effect, and if a fan with a larger size is used, the size of the position where the fan is located will become larger, and meanwhile, the limit foot needs to avoid the position of the fan, and the limit foot needs to move outwards.

The plane of the placement plate 161 of the battery pack 16 of the sander 100 in the foregoing embodiment is substantially parallel to the axis X1 of the motor 11, and referring to fig. 1, the first rotation axis y of the operating member 30 is perpendicular to the plane of the sanding bottom plate 211, and referring to fig. 3, the first rotation axis y of the operating member 30 is parallel to the plane of the placement plate 161. Referring to fig. 21 and 22, for convenience of holding and operation, it is necessary to leave a space for avoiding the space of the operating handle 32 'on the holding housing 14' as much as possible, in this embodiment, the battery pack 16 'is disposed to be inclined toward the motor (not numbered) more downward, and for optimal holding experience and considering the overall layout of the whole machine, the angle between the plane of the placement plate 161' and the rotation axis y 'of the operating member 30' is between 0 and 45 degrees.

In summary, since the placing plate deviating from the motor is disposed on the energy supply assembly, the polishing tool can use the placing plate as a placing surface and can also use the polishing bottom plate as a placing surface, and when the polishing bottom plate is used as or the placing plate is used as a placing surface, the operation member can be operated to realize the installation and separation of the bottom plate assembly and the main body, so that the polishing tool is more comfortable and easier to operate in the process of installing and separating the bottom plate assembly and the main body.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. A grinding tool, comprising

the method is characterized in that: the energy supply assembly comprises a placement plate arranged away from the motor, and the polishing tool can be placed on the surface where the placement plate is located; the polishing tool further comprises an operating piece rotatably arranged relative to the shell, the operating piece is positioned above the main body part far away from the bottom plate assembly, and when the polishing tool is placed on any one of the surface on which the plate is placed or the surface on which the bottom plate is polished, the operating piece can be operated to mount or separate the bottom plate assembly from the main body part;

the projection of the gravity center of the polishing tool in the polishing bottom plate falls into the plane where the polishing bottom plate is located or the projection of the gravity center of the polishing tool in the placing plate falls into the plane where the placing plate is located.

2. The abrasive tool of claim 1, wherein: the first rotation axis of the operating piece is perpendicular to the surface of the polishing base plate or the first rotation axis of the operating piece is parallel to the surface of the placing plate.

3. The abrasive tool of claim 1, wherein: the main body part includes the first connecting piece that can drive the rotation by the operating piece, the bottom plate subassembly includes can for the rotatory bottom plate pivot of bottom plate of polishing, be equipped with in the bottom plate pivot with first connecting piece joins in marriage and connects in order to realize the main body part with the second connecting piece of bottom plate subassembly inseparable connection.

4. The abrasive tool of claim 3, wherein: the casing includes the main casing and holds the casing that is the angle setting with the main casing, main part still includes the jackshaft of biasing in motor one side, the motor with the jackshaft is located inside the main casing, the jackshaft is located the motor with hold between the casing, hold the casing be located the main casing with energy supply subassembly between.

5. The abrasive tool of claim 1, wherein: the operating member includes an operating handle having an open state and a closed state, and a length from a trailing end of the operating handle, which is remote from the first axis of rotation, to the first axis of rotation is between 55mm and 110mm when in the closed state.

6. The abrasive tool of claim 5, wherein: when in the open state, the distance from the tail end of the operating handle, which is far away from the first rotation axis of the operating handle, to the upper end surface of the shell is between 20mm and 40 mm.

7. The abrasive tool of claim 1, wherein: the energy supply assembly is a battery pack which is inclined towards the motor more downwards, and the angle between the plane of the placing plate and the first rotation axis of the operation piece is between 0 and 45 degrees.

8. A method of disassembling a floor assembly of a sanding tool, comprising: the grinding tool includes:

an energy supply assembly located on one side of the body portion for supplying energy to the motor, the energy supply assembly including a placement plate disposed away from the motor;

The projection of the gravity center of the polishing tool in the polishing bottom plate falls into the plane of the polishing bottom plate or the projection of the gravity center of the polishing tool in the placing plate falls into the plane of the placing plate;

9. A method of installing a floor assembly of a sanding tool, comprising: the grinding tool includes:

the bottom plate assembly is detachably arranged below the main body part and comprises an eccentric rotating shaft and a polishing bottom plate, the eccentric rotating shaft can move relative to the polishing bottom plate under the action of the torque output part so as to drive the polishing bottom plate to realize polishing, and a second connecting piece connected with the first connecting piece is arranged on the eccentric rotating shaft;

An energy supply assembly located on a side of the body portion remote from the motor for supplying energy to the motor, the energy supply assembly including a placement plate disposed away from the motor;

placing the polishing tool by taking a placing plate as a bottom plane;

aligning the first connector with the second connector; and