CN209868288U

CN209868288U - Polishing tool

Info

Publication number: CN209868288U
Application number: CN201920065175.9U
Authority: CN
Inventors: 张士松; 钟红风; 孙益民; 吉绍山; 朱爱民
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: 2019-12-31
Anticipated expiration: 2029-01-15
Also published as: CN110039442B; CN110039420A; CN110039442A; CN209408223U; CN110039420B

Abstract

The utility model relates to a grinding tool belongs to the electric tool field, this grinding tool, including main part and the bottom plate subassembly of setting on the main part, the main part includes the motor, the biasing is in the jackshaft of motor one side, be used for accomodating the main casing body of motor and jackshaft, and set up the casing that grips that just is angle setting with the main casing body in main casing body one side, bottom plate unit mount is in the lower extreme of jackshaft, motor drive bottom plate subassembly is so that the bottom plate subassembly carries out the work of polishing, the bottom plate subassembly is including the bottom plate of polishing of accomplishing the work of polishing, a serial communication port, the axis of jackshaft sets up with the axis interval of motor, and the motor with grip the casing and. The polishing tool can prevent the gravity center of the whole sander from deviating to one side, so that the gravity center of the sander can be closer to the middle shaft when the sander works, the bottom plate assembly has small vibration when the sander works, and the sander is more comfortable to operate; and the polishing tool is easy to place in a standing state, so that the polishing tool is prevented from toppling.

Description

Polishing tool

Technical Field

The utility model relates to a polishing tool belongs to the electric tool field.

Background

Existing sanders include circular sanders and flat sanders, among others, in which the intermediate shaft sanding sole of the circular sander works essentially around the axis of the intermediate shaft for grinding relatively large amounts of material, for example for rough grinding. The sanding sole plate of the plate sand is limited in its self-transmitting movement, so that the sanding sole plate essentially performs a sanding movement about the axis of the intermediate shaft, i.e. only performs a regular orbital movement of revolution, which is suitable for grinding small amounts of material, for example for fine machining or finishing.

Sander generally includes the main part and sets up bottom plate subassembly on the main part, the main part include the motor, with the intermediate shaft that the motor is connected, be used for accomodating motor and intermediate shaft's main casing body, set up the power supply unit who grips the casing and provide the electric energy for sander in main casing body one side. Because the motor usually has a weight which occupies about 1/3 of the whole sander, the current sanders generally have a phenomenon of unbalanced weight, when the sanders are in a static state, the sanders will topple over, and when the sanders are started, because of the problem of unbalanced weight, people are often required to increase the control force to prevent the sanders from inclining to one side.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an easily put and operate more comfortable grinding tool.

In order to achieve the above purpose, the utility model provides a following technical scheme: the utility model provides a grinding tool, includes the main part and sets up bottom plate assembly on the main part, the main part includes the motor, the biasing in the jackshaft of motor one side, be used for accomodating the main casing body of motor and jackshaft and setting are in main casing body one side and the casing that grips that is the angle setting with the main casing body, bottom plate assembly install in the lower extreme of jackshaft, motor drive bottom plate assembly is so that the bottom plate assembly carries out the work of polishing, bottom plate assembly is including the bottom plate of polishing of accomplishing the work of polishing, its characterized in that, the axis of jackshaft with the axis interval of motor sets up, just the motor with it is in to grip the casing distribution the both sides of jackshaft.

Further, the center of gravity of the main body portion is located between the axis of the motor and the axis of the intermediate shaft.

Further, the grinding tool also comprises an energy supply assembly for supplying energy to the motor, and the energy supply assembly and the main shell are distributed at two ends of the holding shell.

Further, the motor and the energy supply assembly are distributed on both sides of the intermediate shaft.

Further, the casing that grips sets up in the main casing is close to the one end of jackshaft, energy supply subassembly, main casing distribute in the both ends of casing are gripped.

Further, the energy supply assembly is a battery pack, the mass of the battery pack is 333g to 630g, the center of gravity of the grinding tool is located on one side, away from the motor, of the middle shaft, and the projection of the center of gravity of the grinding tool in the direction of the grinding bottom plate falls into the grinding bottom plate.

Further, the axis of the intermediate shaft is parallel to the axis of the motor.

Further, the distance from one end of the main shell far away from the holding shell to the end of the main shell connected with the holding shell is 70mm to 80 mm.

Further, the distance from the end of the main body part where the main shell is located to the end of the main body part far away from the main shell is 185mm to 220 mm.

Further, the bottom plate assembly is detachably mounted on the main body portion, and the bottom plate assembly is any one of a round sand bottom plate assembly and a plate sand bottom plate assembly.

Further, the energy supply assembly is a battery pack, the mass of the battery pack is larger than 333g, and the gravity center of the grinding tool gradually moves from a position between the axis of the motor and the axis of the intermediate shaft to a direction close to the battery pack along with the increase of the mass of the battery pack.

Further, the grinding tool further comprises a limiting foot positioned between the main body part and the bottom plate assembly, and the limiting foot can be selectively connected with the bottom plate assembly to limit the grinding bottom plate of the bottom plate assembly to rotate around the axis of the intermediate shaft.

Further, the main body part further comprises a torque output part for transmitting the power of the motor to the bottom plate assembly and a transmission part for transmitting the power of the motor to the torque output part, the transmission part comprises a first transmission wheel driven by the motor and a second transmission wheel driven by the first transmission wheel, and the rotation axis of the first transmission wheel and the rotation axis of the second transmission wheel are arranged at intervals.

Furthermore, the main body part further comprises a second fan which is fixedly arranged opposite to the second driving wheel and can cool the second driving wheel, and a first fan which is coaxially arranged with the motor, is positioned at one end of the motor close to the grinding part and can cool the motor.

Further, the housing is provided with at least one air inlet and at least one air outlet, the at least one air inlet is disposed close to the motor, the at least one air outlet is disposed close to the second fan, and the external air flows through the motor from the air inlet close to the motor under the action of the first fan and flows out from the air outlet close to the second fan under the action of the second fan.

The utility model discloses still can adopt following technical scheme: the utility model provides a grinding tool, include the main part and set up in the bottom plate subassembly of main part, the main part include the motor, the biasing in the jackshaft of motor axis one side, be used for accomodating the main casing body of motor and jackshaft and setting are in main casing body one side and the casing that grips that is the angle setting with the main casing body, bottom plate unit mount in the lower extreme of jackshaft, bottom plate subassembly is including can be by the rotatory bottom plate pivot of motor drive and by the bottom plate pivot drive in order to polish the bottom plate of work, the rotation axis of bottom plate pivot with the axis coaxial line of jackshaft, just the axis of jackshaft with the axis interval of motor sets up, the motor with it distributes to grip the casing the both sides of jackshaft.

The beneficial effects of the utility model reside in that: the polishing tool of the utility model arranges the axis of the intermediate shaft and the axis of the motor at intervals, and arranges the motor and the holding shell at two sides of the intermediate shaft, thereby avoiding the gravity center of the whole machine from deviating to one side, so that the gravity center of the polishing tool can be closer to the vicinity of the intermediate shaft when in work, the bottom plate component has small vibration when in work and is more comfortable when in operation; and the polishing tool is easy to place in a standing state, so that the polishing tool is prevented from toppling.

The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.

Drawings

Fig. 1 is a schematic view of the overall structure of the sander according to a preferred embodiment of the present invention, without a battery and a dust collecting device.

Fig. 2 is a structural diagram of the gravity center position of the whole sander when the first type of battery pack is installed.

Fig. 3 is a structural diagram of the gravity center position of the whole sander when the battery pack is not installed.

Fig. 4 is a structural diagram of the gravity center position of the whole sander when a second type of battery pack is installed.

Fig. 5 is a structural diagram of the gravity center position of the whole sander when a third type battery pack is installed.

Fig. 6 is a schematic structural diagram of the sander when the sander is placed with the placing plate of the battery pack as a placing surface.

Fig. 7 is a schematic view of the sander shown in fig. 1 without a portion of the main housing installed.

Fig. 8 is a partially exploded view of the sander shown in fig. 1.

Fig. 9 is an exploded view of the sander of fig. 1.

Fig. 10 is a schematic structural view of a part of the stopper mechanism in fig. 1.

Fig. 11 is an enlarged view of circle a in fig. 8.

Fig. 12 is a sectional view of the body portion and floor assembly of fig. 1 in a mated condition.

FIG. 13 is a schematic structural view of the locking mechanism of FIG. 1;

FIG. 14 is a schematic view of the operating member of FIG. 1.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

Referring to fig. 1, 7 and 8, the sanding tool in the present embodiment is exemplified by a multifunctional sanding machine 100 (hereinafter referred to as a sanding machine 100), the sanding machine 100 can be replaced by different base plate assemblies 20, and the sanding machine 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 as a reference direction, the a-a direction is the up-down direction of the sander 100, wherein the bottom plate assembly 20 is defined to be located below the entire sander 100. The main body portion 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 one end of the main housing 13 remote from the motor 11. The bottom plate assembly 20 is mounted on the lower side of the intermediate shaft 12, and specifically, the main body 10 is connected to the bottom plate assembly 20 through the intermediate shaft 12 and a threaded rod 41 (see fig. 8) located in the intermediate shaft 12. the principle of the specific connection between the main body 10 and the bottom plate assembly 20 will be described later. The motor 11 drives the base plate assembly 20 to move to cause the base plate assembly 20 to perform a grinding work, and the base plate assembly 20 has a grinding base plate 221 for performing the grinding work. In this embodiment, the main housing 13 and the holding housing 14 are injection molded, the main housing 13 and the holding housing 14 are 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 shells that are substantially symmetrical. The holding shell 14 is disposed at one end of the main shell 13 close to the middle shaft 12, the holding shell 14 is disposed at an angle with the main shell 13, in this embodiment, the holding shell 14 includes a holding handle 141 for holding and a holding cavity 142 for holding to make fingers bend and extend, the holding handle 141 is located at an upper side of the holding cavity 142, that is, the holding handle 141 is located at a side away from the bottom 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 (note that the angle refers to the angle between the extending direction of the grip handle 14 and the axial extending direction of the main housing 13 at 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 disposed on both sides of the intermediate shaft 12. The axis of the intermediate shaft 12 and the axis of the motor 11 are arranged at intervals, and the motor 11 and the holding shell 14 are arranged on two sides of the intermediate shaft 12, so that the gravity center of the whole sander 100 is prevented from deviating to one side, the gravity center of the sander can be closer to the vicinity of the intermediate shaft 12 when the sander is in work, the bottom plate assembly 20 is small in vibration when the sander is in work, and the sander is more comfortable to operate; and the polishing tool is easy to place in a standing state, so that the polishing tool is prevented from toppling.

Referring to fig. 2, 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 distributed on both sides of the intermediate shaft 12. It is understood that the energy supply assembly may be an ac power supply or a dc power supply, such as a battery assembly or a battery pack. In this embodiment, a power supply mode in which the energy supply module employs a battery pack is specifically described as an example. The battery pack mounting portion 17 of the battery pack 16 is provided at an end of the grip case 14 remote from the main case 13 in this embodiment. Referring specifically to fig. 1, the battery pack mounting portion 17 is provided with a guide rail 171 to which the battery pack 16 is mounted, and electrode tabs 172 that are electrically connected to the battery pack 16. It is understood that the battery pack 16 is provided with a guide groove (not shown) to be coupled with the guide rail of the battery pack mounting part 17 and an electrode tab insertion groove (not shown) to be coupled with the electrode tab, but it is understood that the electrode tab 172 may be provided on the battery pack while the electrode tab insertion groove is provided on the battery pack mounting part 17.

Referring to fig. 3, when the main body portion 10 is not mounted with the battery pack 16, the center of gravity G3 of the main body portion 10 is located between the axis X1 of the motor 11 and the axis X0 of the intermediate shaft 12. Referring to fig. 2, when the main body 10 is installed with the battery pack 16 and the mass of the battery pack 16 is greater than 333g, and as the mass of the battery pack 16 increases, 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 to a direction approaching the battery pack 16. Referring to fig. 4, when the battery 16 has 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 sole 221 of the sole plate assembly 20 falls within the sanding sole 221. Referring to fig. 5, when the mass of the battery pack 16 is above 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 of the center of gravity of the sander 100 in the direction of the polishing bottom plate 221 of the bottom plate assembly 20 falls outside the area where the polishing bottom plate 221 of the bottom plate assembly 20 is located, at this time, when the sander 100 is placed with the surface where the polishing bottom plate 221 is located as a placing surface, the sander 100 is inclined toward the battery pack 16 side.

Since the motor 11 and the holding case 14 are located on both sides of the intermediate shaft 12, and the energy supply assembly (the battery pack 16) and the main case 13 are located on both ends of the holding case 14, the corresponding motor 11 and the corresponding battery pack 16 are respectively disposed on both ends of the sander 100, and when viewed from the perspective of fig. 2, the motor 11 can be regarded as a front end, and the battery pack 16 as a rear end. Since the main weight of the sander 100 comes from the motor 11 and the energy supply assembly (battery pack 16), the center of gravity of the motor 11 and the center of gravity of the energy supply assembly (battery pack 16) have a large influence on the center of gravity of the sander 100, for example, if the center of gravity of the motor 11 is located as G1, the center of gravity of the energy supply assembly (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, and the distance from the center of gravity G2 of the energy supply assembly (battery pack 16) to the center of gravity of the sander 100 is located as a2, in order to ensure the balance of the whole sander, prevent toppling when standing, and bring about good operation experience, the center of gravity of the sander 100 satisfies the following formula (named as: the weight a1 of the motor 11 is equal or approximately equal to the weight a2 of the power supply assembly 16 (battery pack 16).

In this embodiment, the battery pack 16 is detachably connected to the holding case 14. It is to be understood that the battery pack 16 may also be a non-removable energy storage battery pack 16. Because the battery pack 16 is detachable, the sander 100 can select different battery packs 16 to be assembled according to the requirement of working time. Typically the mass of the battery pack 16 is selected to be between 333g and 630 g; the battery pack 16 has a type of any one of voltage 20V, capacity 2Ah, voltage 20V, capacity 4Ah, and voltage 20V, capacity 6 Ah. Due to the replaceability of the battery pack 16, the weight of the battery pack 16 is variable, and after the sanding machine 100 is shipped, the weight of the motor 11 is basically fixed, therefore, depending on the capacity of the battery pack 16 to be mounted, the position of the center of gravity thereof is not fixed, as shown in fig. 3, when the battery pack 16 is not installed in the machine, the center of gravity G3 of the sander 100 falls near the center of gravity G1 of the motor 11, as also shown in figure 2, when the complete machine is fitted with a 2Ah battery pack 16 (e.g., 20V, 2Ah battery pack 16 weighs about 370G), the center of gravity G3 of sander 100 is located behind the center shaft 12, as shown in figure 4, when the whole sander is equipped with a 4Ah (for example, the weight of a 20V, 4Ah battery pack 16 is about 630G), the gravity center G3 of the sander 100 will fall to a position further back from the middle shaft 12 again, and the position of the gravity center G3 of the sander 100 is proportional to the capacity of the battery pack 16. However, when the battery pack 16 reaches 6Ah or more, the center of gravity G3 of the sanding machine 100 is gradually located away from the intermediate shaft 12, so that the entire machine is unbalanced and a rollover condition as shown in fig. 5 is likely to occur. Thus, damage to the tool or the work surface may occur. Therefore, instructive advice for selecting the battery pack 16 can be given by the "center of gravity formula".

In order to more precisely set the position of the gravity center G3 of the sanding machine 100, the position range of the gravity center of the sanding machine 100 needs to be defined, when the sanding sole plate 221 is used as a supporting plane, and when the gravity center G3 of the sanding machine 100 falls in a supporting plane B-B using the sanding sole plate 221 as a supporting plane, the whole machine can be kept in a balanced state, and a normal placement condition without toppling is presented, as shown in fig. 2 to 4; when the center of gravity G3 of the sanding machine 100 falls outside the supporting plane B-B of the sanding sole 221, the entire machine cannot be balanced, and a toppling and side-tipping situation appears, as shown in fig. 5, which is not conducive to a user replacing the sole assembly 20 of the sanding machine. In this embodiment, the battery pack 16 includes the placing plate 161 arranged away from the motor, and in practical use, the placing plate 161 may also be used as a supporting surface, and when the placing plate 161 of the battery pack 16 is used as a supporting plane, as shown in fig. 6, the gravity center G3 of the sander 100 still falls within the range of the supporting plane (the placing plate 161) of the battery pack 16, and the whole sander may still be placed in a balanced state.

Referring to fig. 2 and 3, for convenience of operation and suitable for hand-held operation, the main portion of the main body 10 of the present embodiment is preferably sized such that the distance K1 from the end of the main housing 13 away from the grip housing 14 to the end connected to the grip housing 14 is between 70mm and 80 mm. The distance K2 (i.e., the axial length of the holding cavity 142) from the end of the holding cavity 142 close to the main housing 13 to the end of the holding cavity 142 close to the battery pack mounting portion 17 is between 90mm and 105mm for easy holding. The distance K3 between one end of the holding cavity 142 close to the battery pack mounting part 17 and one side of the battery pack mounting part 17 far away from the main housing 13 is 25mm-35mm, so as to fix the battery pack 16 conveniently and ensure that the strength of the battery pack mounting part 17 is proper. Therefore, the end of the main housing 13 of the main body 10 is between 185mm and 220mm away from the end of the main housing 13, i.e. the overall length of the main body 10 is between 185mm and 220 mm.

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

Referring to fig. 7 to 9, in the present embodiment, the axis X0 of the intermediate shaft 12 is parallel to the axis X1 of the motor 11, and the main body 10 includes a torque output part for transmitting the power of the motor 11 to the sole plate assembly 20 and a transmission part 15 for transmitting the power of the motor 11 to the torque output part, so that the sole plate assembly 20 is moved by the motor 11 to perform the sanding operation. The composition of the transmission portion 15 in the present embodiment will be described first. The transmission section 15 includes a first transmission wheel 151 disposed coaxially with the motor 11 and driven to rotate by the motor 11, and a second transmission wheel 152 driven by the first transmission wheel 151 and disposed coaxially on the intermediate shaft 12. The rotational axis of the first transmission wheel 151 is spaced from the rotational axis of the second transmission wheel 152. In order to reduce noise and vibration of the first driving wheel 151 and the second driving wheel 152 during torque transmission, it is preferable that power transmission is performed between the first driving wheel 151 and the second driving wheel 152 by means of a transmission belt 153. In order to make the transmission belt 153 stably transmit with the first transmission wheel 151 and the second transmission wheel 152 and avoid the phenomena of slipping, etc., in the embodiment, the transmission end surfaces of the first transmission wheel 151 and the second transmission wheel 152 are both provided with ratchets (not numbered), and correspondingly, the transmission surfaces (not numbered) where the transmission belt 153 is matched with the transmission surfaces are provided with corresponding ratchets (not numbered). 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 unit 15 may not be provided on the intermediate shaft 12, and may be directly supported in the main casing 13 or on another shaft in the casing. In the present embodiment, the intermediate shaft 12 is vertically disposed in the main housing 13 through two pairs of bearings (not numbered) so that the intermediate shaft 12 can rotate relative to the main housing 13. In this embodiment, the intermediate shaft 12 and the second driving wheel 152 may be connected by interference fit or a key, so that the second driving wheel 152 can rotate while driving the intermediate shaft 12 to rotate relative to the main housing 13, in other embodiments, the intermediate shaft 12 may be disposed to rotate relative to the main housing 13, and may be fixed to the main housing 13, and the connection between the intermediate shaft 12 and the second driving wheel 152 may be fixed by a bearing, etc., so that the second driving wheel 152 can rotate relative to the intermediate shaft 12.

Since the bottom plate assembly is a replaceable component, it may be any one of a sand bottom plate assembly, a round sand bottom plate assembly (see the bottom plate assembly schematically shown in fig. 2-3), and a profiled sand bottom plate assembly, wherein the sand bottom plate assembly includes an 1/4 sand bottom plate assembly, a 1/3 sand bottom plate assembly (see fig. 9 bottom plate assembly), a triangular sand bottom plate assembly or a profiled sand bottom plate assembly, etc., that is, the bottom plate assembly that needs to restrict the rotation movement of the sanding bottom plate when the bottom plate assembly 20 is in operation is called a sand bottom plate assembly. The operator can selectively connect different types of base plate assemblies 20 with the main body 10 according to different polishing requirements. However, regardless of the base plate assembly 20, referring to fig. 8, 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 housing 22 includes a base bracket (not numbered) fixed to the outer race of the bearing 21, and a sanding base 221 located below the base bracket, and sandpaper may be installed below the sanding base 221 to perform sanding work through the sandpaper. If the bottom plate component 20 is a round sand bottom plate component, the polishing bottom plate is round; if the bottom plate component is a plate sand bottom plate component, the grinding bottom plate is rectangular, triangular or other shapes which do not return to the side. The sanding sole of the round sand sole assembly performs both revolution during sanding and, at the same time, the sanding sole rotates due to the combined action of the bearing 21 and the sole rotating shaft 23, that is, the sanding sole performs orbital motion of rotation and revolution, and therefore, when an operator needs to remove a large amount of abrasive, the sanding sole 221 can be mounted to the body 10. Referring to fig. 8, after the main body 10 and the bottom plate assembly 20 are installed, the bottom plate rotating shaft 23 is coaxial with the axis of the intermediate shaft 12, the bottom plate rotating shaft 23 is driven to rotate by the second driving wheel 152, the bearing 21 is located between the bottom plate rotating shaft 23 and the bottom plate bracket, the outer ring of the bearing 21 is fixed to the bottom plate bracket, and the inner ring of the bearing 21 is fixed to the bottom plate rotating shaft 23, so that the bottom plate rotating shaft 23 can rotate relative to the bottom plate bracket. Preferably, the base plate rotating shaft 23 includes an eccentric shaft section (not numbered) to move the base plate bracket and the sanding base plate 221 fixedly connected to the base plate bracket by the rotation of the eccentric shaft section. As can be appreciated, since the bottom plate bracket is fixedly connected to the polishing bottom plate 221, when the eccentric shaft section rotates relative to the bottom plate bracket, the bottom plate bracket can drive the polishing bottom plate 221 to swing regularly to implement the polishing operation. Further, since the axis of the eccentric shaft segment has an eccentric amount e1 with respect to the axis X0 of the intermediate shaft 12, the counter weight 24 is provided on the bottom plate rotating shaft 23 in order to reduce the wobbling caused by the eccentric amount e 1.

Referring to fig. 8 and 9, it should be noted that the sanding sole plate 221 is a plate sanding sole plate assembly, and if the sanding sole plate 221 rotates around under the sole plate rotating shaft 23, the four corners of the rectangular sanding sole plate 221 rotating at a high speed are dangerous, so the sanding machine 100 further includes a limiting mechanism 25 for limiting the sanding sole plate 221 from rotating.

Referring to fig. 9 and 10, preferably, the limiting mechanism 25 is fixed on the main body 10, and the limiting mechanism 25 includes a limiting base 251 and a limiting leg 252 disposed on the limiting base 251, and the limiting leg 252 extends toward the main housing 13. The plurality of limiting legs 252 are provided, each limiting leg 252 includes a plurality of flexible columns (not numbered), the limiting legs 252 are detachably fixed to the main housing 13 of the main body 10 by screws or the like, the plurality of flexible columns of each limiting leg 252 surround a hollow through hole and the through hole penetrates through the limiting substrate 251, and the hollow through hole surrounded by the plurality of flexible columns of the limiting legs 252 is a limiting hole 253. An installation sheet 254 is arranged at one end of each limiting foot 252, which is far away from the limiting base plate 251, an installation hole (not numbered) used for being matched with a fastener such as a screw is formed in the installation sheet 254, and when the fastener such as the screw is installed, an operator can screw the fastener such as the screw in through the limiting hole 253 from the lower side of the limiting base plate 251. In this embodiment, the bottom plate assembly 20 is provided with a limiting column 27, and the limiting column 27 extends from the bottom plate housing 22 toward the main body 11, that is, toward the limiting leg 252 on the main body 10, so that when the plate sand bottom plate or the irregular sand bottom plate is installed on the main body 10, the limiting column 27 can be smoothly inserted into the limiting hole 253 to prevent the sanding bottom plate 221 from rotating. The stopper posts 27 are formed to project from the floor case 22 toward the main body 10. In this embodiment, an elastic element 255 is disposed between the position-limiting pillar 27 and the position-limiting pin 252, and the elastic element 255 is disposed at one end of the position-limiting hole 253 close to the position-limiting substrate 251. The elastic member 255 in this embodiment includes an elastic member 2551 between the floor case 22 and the opening of the stopper hole 253 to isolate the floor case 22 and the stopper mechanism 25 from vibration in the up-down direction; the elastic member 255 further includes a second elastic member 2552 between the stopper post 27 and the sidewall of the stopper hole 253 to isolate the stopper post 27 and the stopper hole 253 from vibration in the radial direction, i.e., vibration in the radial direction between the floor housing 22 and the stopper mechanism 25. Since the base plate assembly 20 of the sander 100 can be of various types, it is necessary to provide the sanding base plate 221 with the position-limiting mechanism 25, and in addition to the aforementioned sanding base plate 221 of 1/3 sand shape and 1/4 sand base plate, another base plate assembly (also called rat sand or shaped sand) with a nearly iron-like sanding base plate is included. The cost can be saved by attaching the stopper mechanism 25 to the main body 10.

When all establish stop gear 25 on every bottom plate subassembly 20, because of the kind of the bottom plate subassembly 20 that needs installation stop gear 25 is more, then need the stop gear of a large number, the cost is higher. In addition, since the elastic element 225 and the limiting hole 253 are mostly in interference fit, the elastic element 225 is difficult to mount, and therefore, the assembly is difficult as the number of the elastic elements 225 is increased. When the bottom plate assembly 20 is a circular sand bottom plate assembly, the limiting column 27 is not optionally provided, so that, in actual operation, the limiting leg 252 can be selectively connected with the bottom plate assembly 20 to limit the self-rotation of the grinding bottom plate 221 of the bottom plate assembly 20 around the axis X0 of the intermediate shaft 12. Referring to fig. 8 and 9, in the present embodiment, since the distance between the limiting foot 252 and the axis X0 of the intermediate shaft 12 is a fixed value, when the motor 11 and the holding shell 14 are disposed on both sides of the axis X0 of the intermediate shaft 12 in the present embodiment, the overall structure of the sander 100 is more compact than the prior art.

Indeed, in other embodiments, the limiting pin may be disposed on the bottom plate assembly, and if the limiting pin is disposed on the bottom plate assembly, only the space for accommodating the limiting pin is reserved on the main body, and when the device is used specifically, the limiting pin may be directly disposed on the bottom plate assembly, or the limiting mechanism in this embodiment may be mounted on the bottom plate assembly to form an integral structure; or, the limiting leg may be set as an independent component, for example, the limiting mechanism in this embodiment is set as an independent component, so that the limiting mechanism does not belong to the main body portion nor the bottom plate assembly, and similarly, a space for accommodating the limiting leg is reserved on the main body portion, and the limiting column is selectively reserved on the bottom plate assembly (when the circular sand bottom plate assembly is used, the limiting column may be optionally omitted, and when the bottom plate assembly in this embodiment is used, the limiting column is reserved).

As described above, the torque output portion 71 transmits the driving force of the motor 11 to the sole plate assembly 20 to enable the sole plate assembly 20 to perform the grinding work, in the embodiment, please refer to fig. 8 and 9, the torque output portion 71 is disposed between the sole 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 sole plate assembly 20. The base plate assembly 20 is provided with a torque input portion 72 coupled to the torque output portion 71, so as to transmit the torque of the second transmission wheel 152 to the base plate assembly 20, and thus transmit the driving force of the motor 11 to the base plate assembly 20. In this embodiment, the torque output portion 71 is directly fixed to the second transmission wheel 152 to achieve synchronous rotation. When the bottom plate assembly 20 is mounted to the main body 10, the torque output portion 71 cooperates with the torque input portion 72 to rotate the bottom plate rotating shaft 23. Referring to fig. 9, in the present embodiment, preferably, the torque output portion 71 is a first engaging tooth fixedly connected to the second transmission wheel 152 and uniformly arranged in the circumferential direction, and the torque input portion 72 is a second engaging tooth uniformly arranged outside the bottom plate rotation shaft 23 and capable of cooperating with the first engaging tooth. Specifically, referring to fig. 7 and 8, the fan 63 is fixed to the lower end of the intermediate shaft of the second transmission wheel 152, and the fan 63 includes a ring-shaped fan base 630, a first blade (hereinafter, referred to as a second fan 631) extending from a side surface of the fan base 630 toward the second transmission wheel 151, and a second 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 convex teeth arranged on the second driving wheel 152 and fixedly connected with the second driving wheel 152 or arranged on the inner periphery of the fan 63 and fixedly connected with the fan 63, and the second engaging teeth are a plurality of convex teeth radially extending outwards from the upper end of the bottom plate rotating shaft 23. It is understood that the torque output portion 71 and the torque input portion 72 may be arranged in other manners as long as the transmission of the rotational motion (torque transmission) between the motor 11 and the floor rotating shaft 23 is achieved. 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 the torque to the floor assembly 20 through the rotation transmitting 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 rotation transmission member only realizes torque transmission, however, the bottom plate assembly 20 not only needs to be capable of rotating under the driving of the rotation transmission member of the main body portion 10, but also needs to be axially connected with the main body portion 10 to realize the installation and disassembly between the bottom plate assembly 20 and the main body portion 10. The axial fixation of the base plate assembly 20 relative to the main body 10 is achieved by providing a coupling assembly.

The connecting assembly comprises a first connecting piece arranged on one of the main body part 10 and the bottom plate rotating shaft 23 and a second connecting piece arranged on the other of the main body part 10 and the bottom plate rotating shaft 23, and the second connecting piece is separated from the first connecting piece or axially connected after rotating relative to the first connecting piece so as to realize the installation or separation of the bottom plate assembly 20 and the main body part 10. Preferably, for ease of operation, the second coupling member is driven to rotate relative to the first coupling member by the operating member 30. The first connecting member may be a fixing hole provided to one of the intermediate shaft 12 and the bottom plate rotating shaft 23; the second connector may be a fastener that connects to the other of the intermediate shaft 12 and the baseplate spindle 23. Referring to fig. 8 and 9, in the present embodiment, the fastening member is a threaded rod 41, an external thread 411 is disposed below the threaded rod 41, the fixing hole 412 is disposed 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 the axial connection between the bottom plate assembly 20 and the main body 10 is realized by matching and connecting the external thread 411 of the threaded rod 41 and the internal thread of the bottom plate rotating shaft 23, and the operating element 30 can operatively drive the threaded rod 41 to rotate relative to the fixing hole 412 with the internal thread to realize 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. It will be appreciated that in other embodiments, the section connecting the threaded rod 41 to the bottom plate rotating shaft 23 may be configured as a hollow threaded rod, and the internal thread may be disposed on the inner wall of the hollow threaded rod and the external thread may be disposed on the bottom plate rotating shaft 23.

Referring to fig. 8 and 11, in the present embodiment, the intermediate shaft 12 is provided as a hollow shaft to facilitate the installation of the threaded rod 41, the threaded rod 41 is at least partially disposed in the hollow shaft, and a flange 413 is provided at an upper end of the threaded rod 41 to prevent the threaded rod 41 from falling out of the hollow shaft. In this embodiment, in order to ensure the coaxiality of the main body 10 and the polishing part 12, that is, the coaxiality between the threaded rod 41 or the rotation axes of the intermediate shaft 12 and the floor rotating shaft 23 so as to reduce the vibration of the sander 100 during operation, the floor rotating shaft 23 is further provided with a second supporting part 414, preferably, the second supporting part 414 is provided as a groove extending in the rotation axis direction, and a first supporting part 415 having substantially the same outer diameter as the groove is formed below the intermediate shaft 12 and extending into the groove. Referring to fig. 12, the length L1 of the middle shaft 12 extending to the fixing hole 412, that is, the axial dimension of the first support part 415 is L1, and L1 is between 4mm and 30mm, preferably L1 is between 11.25mm and 13.75mm, and more preferably L1 is 12.5 mm. The first support portion 415 and the second support portion 414 (groove) are coupled with a small gap therebetween, 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), which is hereinafter referred to as a coupling diameter D1, the coupling diameter D1 is 7mm to 12mm, preferably the coupling diameter D1 is 8.55mm to 10.45mm, and more preferably the coupling diameter D1 is 9.5 mm. It can be understood 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. However, the longer L1, the higher the overall height. In this embodiment, in order to ensure that the coaxiality of the whole device can be ensured well when the mating length is small, the main body 10 is provided with an abutting end face 416 abutting against the upper end face of the rotating shaft 23 of the bottom plate, and the diameter D2 of the abutting end face 416 is larger than D1. In the present embodiment, the abutting end surface 416 is an end surface of the torque input portion 71 abutting against the rotating shaft 23 of the base plate, but it should be understood that in other embodiments, the abutting end surface 416 may be an end surface fixedly connected to the torque output portion 71 and abutting against the rotating shaft 23 of the base plate. In this embodiment, by using the large end surface abutting, the ratio of the matching length L1 to the matching diameter D1 is made as small as 0.33, which can ensure that the matching length L1 is made as short as D1 is a certain specific value, and it can be understood that the larger the value of L1/D1 is, the more favorable the stability of the coaxiality is, on the premise of ensuring the large end surface of D2.

In order to improve the coupling between the second coupling member and the first coupling member, the coupling assembly further includes a first elastic member 42 provided at one end of the second coupling member to provide the second coupling member with a force applied in a direction toward the first coupling member. The first elastic member 42 is fitted over the end of the second connecting member. Referring to fig. 8 and 11, the first elastic member 42 used in this embodiment 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 downward biasing force to the threaded rod 41 along the axis X0 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 bottom plate assembly 20 needs to be replaced, the operating member 30 can rotate relative to the main housing 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, and the threaded rod 41 can freely rotate relative to the operating member 30.

It should be noted that, when the operating element 30 is used to screw the threaded rod 41 to the bottom plate rotating shaft 23, the rotation of the threaded rod 41 will drive the bottom plate rotating shaft 23 to rotate, and the rotation of the bottom plate rotating shaft 23 will drive the rotation of the intermediate shaft 12 through the torque output part 71 and the torque input part 72, so that the external thread 411 of the threaded rod 41 cannot be coupled with the internal thread of the bottom plate rotating shaft 23. Therefore, when the threaded rod 41 is screwed to the bottom plate rotation shaft 23 by the operating element 30, the rotation of the intermediate shaft 12 must be restricted. In this embodiment, sander 100 further includes a locking assembly capable of restricting rotation of intermediate shaft 12 to enable mating or unmating of the first and second attachment members. Referring to fig. 8, 11 and 13, the locking assembly includes a first locking member 1181 that is movable but not rotatable relative to the main housing 13 and a second locking member 1182 fixedly connected to or integrally provided with the intermediate shaft 12, wherein the first locking member 1181 is capable of moving 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 coupled to the second locking member 1182, that is, the locking mechanism is in a locking state, and the intermediate shaft 12 is locked circumferentially. In the embodiment, as can be seen from the above description, since the second driving 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 in the circumferential direction. In addition, since the torque output portion 71 and the torque input portion 72 are engaged with each other through the meshing teeth to transmit torque, that is, the intermediate shaft 12 and the bottom plate rotating shaft 23 are not rotatable relative to each other in the circumferential direction, when the intermediate shaft 12 is locked, the bottom plate rotating shaft 23 is also locked in the circumferential direction, and therefore, the threaded rod 41 is operable to rotate relative to the bottom plate rotating 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, the locking mechanism releases the circumferential locking of the intermediate shaft 12, and 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 stopping groove 1810, the first locking member 1181 is a stopping block capable of moving axially, when the stopping block moves axially upwards to a first position, at least part of the stopping block is located in the stopping groove 1810 to limit the intermediate shaft 12 to rotate circumferentially, and when the stopping block moves axially downwards to a second position, the stopping block is separated from the stopping groove 1810, and the intermediate shaft 12 can rotate freely. It is understood that in other embodiments, the moving direction of the stop block may also be along other directions, such as a radial direction or a direction forming other angles with the axial direction, and the description is omitted here. It is understood that in other embodiments, the locking mechanism may lock the bottom plate rotating shaft 23 in other manners, such as the locking mechanism is implemented by limiting the rotation of the motor or the locking mechanism directly limits a component on the bottom plate rotating shaft 23, so long as the rotation of the bottom plate rotating shaft 23 is achieved.

In addition, the present embodiment switches the lock mechanism between the locked state and the unlocked state by the operating member 30. When the operating member 30 is in the closed state, the operating member 30 axially abuts against the first locking member 1181 (the stop block), the first locking member 1181 compresses the first elastic element 31 downward, so that the first locking member 1181 is located at the second position below, the first locking member 1181 is separated from the second locking member 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 stop block is matched with the stop groove 1810, and the locking mechanism is in the locking state.

Referring to fig. 7, 11 and 14, the operating member 30 includes a handle portion 32 for an operator to grip and a base 33, and the handle portion 32 is pivotally provided to the base 33 via a pivot shaft to be switched between a first operating position and a second operating position. Preferably, the pivot shafts include a first pivot shaft 341 fixed to the handle portion 32 and a second pivot shaft 342 fixed to the base 33, the base 33 is provided with a first sliding slot 331 for the first pivot shaft 341 to rotate, and the handle portion 32 is provided with a second sliding slot (not shown) for the second pivot shaft 342 to move. The handle portion 32 is switchable between a second operation position in a closed state (the second operation position is the state of fig. 7) and a first operation position in an open state (the first operation position is the state of fig. 14). It should be noted that, when the handle portion 32 is located at the second operation position, the handle portion 32 at least partially extends out of the main housing 13; when the handle part 32 is located at the first operation position, the operation member 30 does not exceed the outer contour of the main housing 13; i.e., the grip portion 32 is in the second operative position, the grip portion 32 is substantially level with the grip handle 141; when the handle portion 32 is in the first operating position, the handle portion 32 is disposed at an angle to the grip handle 141. The handle portion 32 is provided with an abutting surface 35 for abutting against the first locking member 1181. Referring to fig. 11, when the handle portion 32 is in the second operating position (in the closed state), the abutting surface 35 of the handle portion 32 presses against the first locking member 1181, and further presses against the first elastic element 31 through the first locking member 1181, so that the first elastic element 31 is compressed, and the first locking member 1181 is located at the second position below, 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 handle portion 32 moves from the second operating position (closed state) (fig. 11) shown in fig. 7 to the first operating position (open state) (fig. 14), the abutting surface 35 moves upward and the first locking member 1181 moves upward under the action of the first elastic element 31, so that the first locking member 1181 moves upward to the first position, the intermediate shaft 12 is locked, and the intermediate shaft 12 is not rotatable relative to the main housing 12.

As described above, since the handle portion 32 can be used to rotate the threaded rod 41, the operation of the sander 100 is simplified, and the structure of the sander 100 is also simplified. The operating member 30 is engaged with the threaded rod 41 as follows: when the operating member 30 is in the closed state, that is, the first handle portion 32 is in the second operating position, and the first locking member 1181 is in the second position, the handle portion 32 cannot drive the threaded rod 41 to rotate; when the handle portion 32 is rotated from the second operating position to the first operating position about the pivot axis, at which time the first locking member 1181 becomes located at the first position, the intermediate shaft 12 is locked, and the handle portion 32 can drive the threaded rod 41 to rotate 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. 11, in this embodiment, the transmission element is a second lug 417 disposed on the threaded rod 41, the operating member 30 includes a first lug 36 corresponding to the second lug 417, and when the handle portion 32 is in the first operating position, the first lug 36 is coupled to the second lug 417, so that the handle portion 32 can drive the threaded rod 41 to rotate relative to the main housing 13, and the bottom plate assembly 20 can be connected to or separated from the main body 10.

Referring to fig. 1 and 7, in the present embodiment, the main housing 13 is provided with a first air inlet 131, a second air inlet 132 and a first air outlet 133. In this embodiment, the sander 100 is provided with a first fan 61 for cooling the motor 11, the first fan 61 is disposed coaxially with the motor 11 and located at one end of the motor 11 close to the bottom plate assembly 20, and the first fan 61 is located below the position where the stator and the rotor of the motor 11 are located. 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 staggered 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. A second fan 631 is used to cool the second transmission wheel 152. In this embodiment, a first cooling air path and a second cooling air path are formed in the sander 100, the first cooling air path and the second cooling air path share the same first air outlet 133, at least a portion of the first air inlet 131 is disposed near the motor, and at least a portion of the first air outlet 133 is disposed near 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. Specifically, the method comprises the following steps: the external air flow flows from the first air inlet 131 close to the motor 11 through the motor 11 and the transmission portion 15 under the action of the first fan 61, and flows out from the first air outlet 133 close to the second fan 631 under the action of the second fan 631, that is, the air flow can stably enter the main housing 13 from the first air inlet 131 and the second air inlet 132, move to the first fan 61 through the motor 11, then pass through the transmission portion 15, and then be guided out of the main housing 13 from the first air outlet 133 by 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 cooling air reaches the transmission portion 15, particularly the second transmission wheel 152, the temperature of the air is higher than the temperature of the air at the position of the motor 11, and thus the cooling efficiency is relatively low, and therefore, in this embodiment, a second cooling air path for cooling the second transmission wheel 152 is further provided to further reduce the temperature of the transmission portion 15. In this embodiment, the first cooling air passage for cooling the motor 11 is communicated with the second cooling air passage for mainly cooling the second driving pulley 152.

The sander 100 further includes a dust collecting device 40 disposed on the body, and a dust collecting air passage is disposed in the sander 100, and the dust collecting air passage sucks air and dust on the lower side of the sanding sole 221 and discharges the air and dust into the dust collecting device 40. The third fan 632 and the second fan 631 share the same hub, in other words, the second fan 631 is located above the hub, and the third fan 632 is located below the hub. An air inlet (not numbered) of the dust collecting air path is located on a side surface of the polishing bottom plate 221 facing the sandpaper and the sandpaper, an air outlet (not numbered) of the dust collecting air path is a dust collecting outlet of the dust collecting device 40 communicated with the third fan 63, so as to blow the debris and dust generated by the polishing part 12 in the polishing process into the dust collecting device 40 through the third fan 63, and the dust collecting device 40 can be a dust bag or a dust collecting box. It should be understood that the air duct in this embodiment may also be arranged in other manners, such as using only one fan to cool the motor 11 and the transmission part 15 simultaneously, but compared with using only one fan to cool the motor 11 and the transmission part 15 simultaneously, the fan combination and the air duct in this embodiment have the following two advantages: 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 transmission member, the cooling effect of the fan on the transmission member will be reduced because the wind after cooling the motor cools the transmission member, and in addition, if a fan with a larger size is needed to achieve a better cooling effect, the size of the position where the fan is located will be increased if the fan with a larger size is used, and meanwhile, the position limiting foot needs to be moved outwards if the position limiting foot needs to avoid the position of the fan.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The utility model provides a grinding tool, includes the main part and sets up bottom plate assembly on the main part, the main part includes the motor, the biasing in the jackshaft of motor one side, be used for taking in the motor with the main casing body of jackshaft and setting are in main casing body one end and with the main casing body is the casing that grips that the angle set up, bottom plate assembly install in the lower extreme of jackshaft, motor drive bottom plate assembly is so that bottom plate assembly polishes the work, bottom plate assembly is including the bottom plate of polishing of accomplishing the work of polishing, its characterized in that, the axis of jackshaft with the axis interval of motor sets up, just the motor with it is in to grip the casing distribution the both sides of jackshaft.

2. An abrasive tool as claimed in claim 1, wherein the centre of gravity of the body portion is located between the axis of the motor and the axis of the intermediate shaft.

3. An abrasive tool as claimed in claim 1, wherein said abrasive tool further comprises a power supply assembly for powering said motor, said power supply assembly, and a main housing, being distributed at both ends of said grip housing.

4. An abrasive tool as claimed in claim 3, wherein said power supply assembly is a battery pack having a mass of between 333g and 630g, said abrasive tool having a centre of gravity located on a side of said intermediate shaft remote from said motor and falling within the abrasive bed in projection in the direction of the abrasive bed.

5. An abrasive tool as claimed in claim 1, wherein the axis of said intermediate shaft is parallel to the axis of said motor.

6. An abrasive tool as claimed in claim 1, wherein the distance from the end of said main housing remote from the grip housing to the end of said main housing connected to said grip housing is between 70mm and 80 mm.

7. An abrasive tool as claimed in claim 1, wherein the distance from the end of the body portion at which the main housing is located to the end of the body portion remote from the main housing is between 185mm and 220 mm.

8. The abrading tool of claim 1, wherein the base plate assembly is removably mounted to the body portion, and the base plate assembly is any one of a round sanding base plate assembly or a plate sanding base plate assembly.

9. The abrading tool of claim 3, wherein the energy supply assembly is a battery pack having a mass greater than 333g, and wherein the center of gravity of the abrading tool is progressively shifted closer to the battery pack from a position between the axis of the motor and the axis of the intermediate shaft as the mass of the battery pack increases.

10. The utility model provides a grinding tool, include the main part with set up in the bottom plate subassembly of main part, the main part include the motor, the biasing in the jackshaft of motor axis one side, be used for taking in the main casing body of motor and jackshaft and setting are in main casing body one side and the casing that grips that is the angle setting with the main casing body, the bottom plate subassembly install in the lower extreme of jackshaft, the bottom plate subassembly including can by the rotatory bottom plate pivot of motor drive and by the bottom plate pivot drive in order to polish the bottom plate of work, its characterized in that, the rotation axis of bottom plate pivot with the axis coaxial line of jackshaft, just the axis of jackshaft with the axis interval of motor sets up, the motor with it distributes to grip the casing the both sides of jackshaft.