CN211029448U - Polishing tool - Google Patents

Abstract

The utility model discloses a grinding tool, include: the motor comprises a stator component and a rotor component, wherein the rotor component comprises a rotor shaft which can rotate by taking the axis of the motor as a shaft; the battery pack is used for supplying power to the motor; a housing for mounting a battery pack; a base including a bottom surface on which a polishing member is mounted; the shell is provided with a battery pack mounting surface for mounting a battery pack, and the battery pack mounting surface is in surface contact with the battery pack; at least part of the battery pack mounting surface is obliquely arranged relative to the bottom surface, and the projection of the battery pack mounting surface on the plane of the bottom surface is positioned in the boundary of the bottom surface. The utility model provides a better polishing tool of practicality.

Description

Polishing tool

Technical Field

The utility model relates to an electric tool, concretely relates to polishing tool.

Background

In the field of electric tools, a grinding tool is a common electric tool, and is generally used for grinding the surface of a woodworking product. Most sanding tools generally include a motor, a drive assembly, and a base, wherein the drive assembly is capable of driving the base to perform at least an eccentric motion. The lower surface of the base is provided with a grinding piece or other grinding pieces, and the grinding piece moves along with the base, so that the surface to be processed is ground and polished.

According to the power supply mode, the polishing tools on the market at present can be divided into an alternating current polishing tool and a direct current polishing tool, and the direct current polishing tool has the advantages of portability, flexible operation and the like. However, due to the fact that the structural design of the whole machine is unreasonable, the direct-current grinding machine is limited in grinding range and poor in adaptability of the battery pack.

SUMMERY OF THE UTILITY MODEL

For solving the not enough of prior art, the utility model aims to provide a better polishing tool of practicality.

An abrading tool comprising: the motor comprises a stator component and a rotor component, wherein the rotor component comprises a rotor shaft which can rotate by taking the axis of the motor as a shaft; the battery pack is used for supplying power to the motor; a housing for mounting a battery pack; a base including a bottom surface on which a polishing member is mounted; the shell is provided with a battery pack mounting surface for mounting a battery pack, and the battery pack mounting surface is in surface contact with the battery pack; at least part of the battery pack mounting surface is obliquely arranged relative to the bottom surface, and the projection of the battery pack mounting surface on the plane of the bottom surface is positioned in the boundary of the bottom surface.

Optionally, a projection of the battery pack in a plane of the bottom surface is a projection of the battery pack, and a ratio of an area of the projection of the battery pack located in a boundary of the bottom surface to an area of the projection of the battery pack is greater than or equal to 0.7 and less than or equal to 1.

Optionally, at least part of the battery pack mounting surface is parallel to the length direction of the battery pack; at least part of the battery pack mounting surface and the bottom surface form an included angle which is more than or equal to 45 degrees and less than 90 degrees.

Optionally, an included angle formed by the mounting surface and the bottom surface of at least part of the battery pack is greater than or equal to 60 degrees and less than or equal to 85 degrees.

Optionally, the housing has a median plane, the housing being substantially symmetrical about the median plane, at least a portion of the battery pack mounting surface being perpendicular to the median plane.

Optionally, the housing includes a holding portion for a user to hold, and at least a portion of the holding portion and at least a portion of the battery pack mounting surface are respectively disposed on two sides of the motor axis along a direction perpendicular to the motor axis.

Optionally, the holding part comprises a first web holding part for holding a first web of a user, and the first web holding part is arc-shaped and concaved towards the inside of the shell; defining a middle shaft surface which is vertical to the bottom surface and passes through the axis of the motor; the projection of the tiger-mouth holding part on the middle axis surface is positioned in the projection of the battery pack on the middle axis surface.

Optionally, the projection of the shell on the bisection plane has an extending track, and at least part of the extending track of the shell is parallel to the bottom plane; the grinding tool further includes: a circuit board for controlling the operation of the motor; the plane of the circuit board is parallel to the bottom surface.

Optionally, the abrading tool further comprises: an eccentric structure for generating an eccentric force or an eccentric moment; wherein the eccentric structure is mounted to the rotor assembly such that the motor can drive the base to perform eccentric motion.

Optionally, the base moves about a central axis, the central axis being coaxial with the motor axis.

The utility model provides a grinding tool can adapt to the battery package of different models, and complete machine structural design is reasonable simultaneously, does not have the dead angle of polishing almost in actual operation to make this grinding tool have better practicality.

Drawings

Figure 1 is a schematic view of a grinding tool of a first embodiment of the present invention;

FIG. 2 is a perspective view of a portion of the construction of the sanding tool of FIG. 1;

FIG. 3 is an inside view of the sanding tool of FIG. 1 with a portion of the housing removed;

FIG. 4 is a cross-sectional view of a portion of the mechanism of the abrading tool of FIG. 1;

FIG. 5 is a top plan view of a portion of the mechanism of the abrading tool of FIG. 1;

FIG. 6 is a perspective view of the grinding tool with a portion of the housing removed;

FIG. 7 is a top plan view of a portion of the mechanism of the abrading tool of FIG. 6;

FIG. 8 is a perspective view of a portion of the mechanism of the sanding tool of FIG. 6;

FIG. 9 is a plan view of a portion of the structure of the grinding tool;

FIG. 10 is a perspective view of a portion of the construction of the sanding tool;

FIG. 11 is a perspective view of a motor and fan of the sanding tool of FIG. 1;

fig. 12 is a schematic view of a partial structure of a grinding tool of a second embodiment of the present invention;

figure 13 is a cross-sectional view of a grinding tool of a third embodiment of the present invention;

FIG. 14 is a front elevational view of a grinding tool of a third embodiment of the present invention, with the housing omitted;

FIG. 15 is a top view of FIG. 14;

FIG. 16 is a sectional view taken along line A-A of FIG. 15;

figure 17 is a front view of a grinding tool of a third embodiment of the present invention;

figure 18 is a top plan view of a grinding tool of a third embodiment of the present invention;

figure 19 is a cross-sectional view of a grinding tool of a fourth embodiment of the present invention;

fig. 20 is a front view of a grinding tool of a fifth embodiment of the present invention;

FIG. 21 is a top view of the grinding tool of FIG. 20;

FIG. 22 is a perspective view of the grinding tool of FIG. 20;

FIG. 23 is a plan view of a portion of the structure of the grinding tool of FIG. 20;

FIG. 24 is a perspective view of a portion of the construction of the sanding tool of FIG. 20;

fig. 25 is a perspective view of a partial structure of the sanding tool of fig. 20.

Detailed Description

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

Fig. 1 shows a grinding tool 100 according to a first embodiment of the present invention for grinding a workpiece. The sanding tool 100 is embodied as a sander, more specifically a flatbed sander, and a user can operate the sanding tool 100 by holding the grip with one or both hands. Of course, it can be understood that grinding tool 100 can be round sand, and grinding tool 100 can also be multifunctional tool, other grinding tools such as burnishing machine, as long as the utility model discloses a grinding tool that technical scheme can be suitable for is all in the utility model discloses a protection scope.

As shown in fig. 1 to 3, the sanding tool 100 includes a battery pack 11, a dust collection device 12, a housing 13, a base 14, a motor 15, and a fan 16 for dissipating heat and sucking dust. The housing 13 surrounds a receiving space formed for receiving at least a part of the motor 15. A base 14 is attached to the housing 13 at the bottom of the abrading tool 100, the base 14 being formed with a bottom surface 14a for mounting an abrading article. The motor 15 can drive the base 14 to perform eccentric motion, so that the base 14 generates relative motion relative to the surface of the workpiece, and the grinding piece rubs the surface of the workpiece to perform grinding function.

The sanding tool 100 in this embodiment is specifically a direct-current sanding machine, the battery pack 11 is arranged on the upper portion of the entire machine and located above the center of gravity of the entire machine, specifically, the battery pack 11 is located below the holding portion 131 for a user to hold and above the accommodating space, and such a position distribution enables the motor 15 to more easily drive the base 14 to perform eccentric motion when the sanding tool 100 works, and meanwhile, vibration felt by the user when the user holds the holding portion 131 is small, so that sanding efficiency is improved, and user experience is optimized. As an alternative embodiment, the sanding tool 100 may also be an ac-dc converting sanding tool, wherein the battery pack 11 is arranged at the upper part of the machine above the center of gravity of the machine, in particular, the battery pack 11 is arranged below the holding part 131 and above the accommodating space. Of course, it will be appreciated that the above location of the battery pack 11 is preferred, and that in other embodiments, the sanding tool 100 may be configured with alternating current.

The sanding tool 100 in this embodiment does not include a transmission mechanism and the base 14 is directly driven in motion by the motor 15. The motor 15 includes a stator assembly and a rotor assembly including a rotor shaft rotatable about a motor axis 101. In this embodiment, the motor 15 is specifically an outer rotor brushless motor, and certainly may be an inner rotor motor, the motor 15 includes a motor shaft 151, the motor axis 101 is a central axis of the motor 15, the motor 15 drives the fan 16 to rotate coaxially with the motor 15, and in fact, the fan 16 is coaxially sleeved outside the motor 15, instead of being disposed below the motor 15 along the motor axis 101, so that the height and the volume of the polishing tool 100 are reduced, the structure of the polishing tool 100 is more compact, and the operation by a user is more convenient.

As shown in fig. 3 to 5, the motor 15 and the base 14, the base 14 and the housing 13 may also be fixedly connected by other connections, and the specific connection form is not limited. In an embodiment of the present invention, the base 14 has a first mounting surface facing the motor 15 for mounting the motor 15, and a second mounting surface opposite to the first mounting surface; the second mounting surface is a bottom surface 14a for mounting a sanding element. The motor 15 may be directly mounted on the first mounting surface of the base 14 in an abutting or contacting manner, or the motor 15 may be indirectly mounted on the first mounting surface of the base 14 with a certain distance from the first mounting surface of the base 14, and the motor 15 is not limited herein.

The grinding tool 100 further comprises a supporting assembly, the supporting assembly comprises a flexible portion 171, the flexible portion 171 has certain flexibility, the motor 15 is fixedly connected to the base 14, one end of the flexible portion 171 is connected to the shell 13, the other end of the flexible portion 171 is connected to the base 14, and the motor 15 drives the base 14 to move when rotating, so that the shell 13 is driven to move. In the present embodiment, the flexible portion 171 connects the motor 15 and the base 14, and the base 14 and the housing 13, and 4 flexible portions 171 are symmetrically distributed about the motor axis 101, but the number of the flexible portions 171 may also be three or two, and is not limited herein.

As an alternative embodiment, as shown in fig. 6 to 8, the support member 17 comprises not only the flexible portion 171 but also the rigid portion 172; the flexible portion 171 extends substantially in a direction perpendicular to the bottom surface 14a and connects the housing 13 and the base 14; the rigid portion 172 is attached to the housing 13 or the base 14, and the rigid portion 172 has a certain rigidity in a direction perpendicular to the bottom surface 14 a. The flexible portion 171 is much more flexible than the rigid portion 172; the rigidity of the rigid portion 172 in the direction perpendicular to the bottom surface 14a is much higher than that of the flexible portion 171. The rigid part 172 ensures that the supporting component 17 has certain rigidity in the direction vertical to the bottom surface 14a, and the whole machine is restrained from jumping when the base 14 vibrates; the flexible part 171 enables the supporting component 17 to have certain flexibility, and the flexible part 171 can be twisted perpendicular to the axial direction when the base 14 vibrates, so that the vibration of the whole machine is reduced; thereby satisfying the mechanical requirements of the supporting component 17 and improving the comfort level of the user.

The housing 13 or the base 14 can move along the surface of the rigid part 172 relative to the rigid part 172, and when the base 14 vibrates, the housing 13 can move relative to the base 14 through the torsional deformation of the flexible part 171 along the direction perpendicular to the axial direction, so that the vibration of the whole machine is reduced. Specifically, in the present embodiment, the rigid portion 172 is mounted to the base 14, and the housing 13 is movable along the upper surface of the rigid portion 172 when the flexible portion 171 undergoes torsion perpendicular to the axial direction thereof. It will be appreciated that the rigid portion 172 may also be mounted to the housing 13, in particular to the lower end of the housing 13, such that the base 14 is movable relative to the rigid portion 172 along the lower surface of the rigid portion 172.

The height of the rigid portion 172 in the direction perpendicular to the bottom surface 14a is equal to or less than the height of the flexible portion 171 in the direction perpendicular to the bottom surface 14 a. This allows the user to press down the housing 13 when operating the sander 100, the flexible portion 171 is twisted perpendicularly to the axial direction thereof, and the housing 13 collides against the upper surface of the rigid portion 172 while sliding along the upper surface of the rigid portion 172 with the vibration of the base 14. In this embodiment, the height of the rigid part 172 in the direction perpendicular to the bottom surface 14a is smaller than the height of the flexible part 171 in the direction perpendicular to the bottom surface 14a, and when the sander 100 is in the rest state of non-operation, the lower surface 13a of the housing 13 is at a certain distance from the upper surface of the rigid part 172. As an alternative embodiment, the height of the rigid portion 172 in the direction perpendicular to the bottom surface 14a is equal to the height of the flexible portion 171 in the direction perpendicular to the bottom surface 14a, and the distance from the lower surface 13a of the housing 13 to the upper surface of the rigid portion 172 is almost 0, that is, the lower surface 13a of the housing 13 is in contact with the upper surface of the rigid portion 172 when the sander 100 is in the inactive, rest state.

The rigid portion 172 and the flexible portion 171 do not contact each other in a plane parallel to the bottom surface 14a, and the rigid portion 172 and the flexible portion 171 do not contact each other in the bottom surface 14 a. That is, the rigid portion 172 and the flexible portion 171 are independently disposed, and there is no positional interference in a direction parallel to the bottom surface 14a, which substantially avoids interference of the rigid portion 172 with the lateral movement of the flexible portion 171, and also makes the structural design and positional arrangement of the rigid portion 172 and the flexible portion 171 more flexible. As an alternative embodiment, the base 14 has one or more axes of symmetry, the base 14 is axisymmetric about the axes of symmetry, the one or more rigid portions 172 are symmetrically disposed about the axes of symmetry, and the one or more flexible portions 171 are symmetrically disposed about the axes of symmetry, for example, the base 14 has the axes of symmetry 102 and 103 in this embodiment, and the 4 rigid portions 172 and the 4 flexible portions 171 are symmetrically disposed about the axes of symmetry 102 and 103. As another alternative, the base has a central axis, the base is centrally symmetric about the central axis, the one or more rigid sections are centrally symmetrically disposed about the central axis, and the one or more flexible sections are centrally symmetrically disposed about the central axis; for example, the bottom surface is square, the flexible portion is 4 pillars disposed at the vertices of the square, and the rigid portion is a large annular bearing, symmetrical about the central axis of the bottom surface.

It can be understood that when the rigid portion 172 and the flexible portion 171 are arranged symmetrically (axisymmetric or centrosymmetric), the stress on the housing 13 can be more uniform when the base 14 vibrates, so that the operation of the whole machine is more stable. However, the rigid part 172 and the flexible part 171 are arranged asymmetrically to achieve the function of the sander 100, and the rigid part 172 and the flexible part 171 can reduce the jump and the vibration, so the specific position arrangement of the rigid part 172 and the flexible part 171 is not limited to the above two embodiments, and is not limited herein.

The housing 13 or the base 14 can slide along the surface of the rigid portion 172 with respect to the rigid portion 172. Specifically, the housing 13 or the base 14 can slide along the surface of the rigid portion 172 with respect to the rigid portion 172. In this embodiment, the rigid portion 172 is 4 bearings fixedly mounted on the base 14, specifically, ball bearings, the flexible portion 171 is 4 supporting pillars made of rubber, two ends of the flexible portion 171 are respectively connected to the housing 13 and the base 14, and the specific connection manner is a bolt-nut connection, but other connection manners are also possible. The surface of the housing 13 interferes with the balls of the bearing to produce relative sliding. As an alternative embodiment, the housing 13 or the base 14 can roll along the surface of the rigid portion 172 relative to the rigid portion 172, specifically, the surface of the rigid portion 172 is smooth, and a rolling member is installed on the surface of the housing 13 or the base 14, so that the housing 13 or the base 14 can roll along the surface of the rigid portion 172 relative to the rigid portion 172 when the housing 13 or the base 14 interferes with the surface of the rigid portion 172.

Since the housing 13 or the base 14 slides or rolls along the surface of the rigid portion 172 with respect to the rigid portion 172, the portions of the base 14 in contact with the rigid portion 172, the portions of the housing 13 in contact with the rigid portion 172, and the portions of the rigid portion 172 in contact with the housing 13 of the base 14 are made of wear-resistant materials, such as powder metallurgy.

As shown in fig. 9 and 10, as another alternative embodiment, the sander comprises a base 14 'and a support assembly 17', the support assembly 17 'comprises a flexible portion 171' and a rigid portion 172 ', and the rigid portion 172' is 4 cylindrical blocks made of wear-resistant material, and the arrangement of the positions of the blocks is the same as that of the rigid portion 172 in the first embodiment.

As shown in fig. 3 to 6 and 11, the grinding tool 100 further includes an eccentric structure 18 for making the grinding tool 100 perform eccentric motion, in the prior art, the eccentric structure is generally disposed on the base of the grinding tool, in the present invention, the eccentric structure 18 is mounted to the rotor assembly so that the motor 15 can drive the base 14 to perform eccentric motion. The base 14 moves about a central axis which is coaxial with the motor axis 101. Further, the base 14 has a central axis, which is arranged coaxially with the motor axis 101; as an alternative embodiment, the base 14 is arranged coaxially with the motor shaft 151. That is, there is no actual structural eccentricity between the base 14 and the motor shaft 151, but because the eccentric structure 18 is mounted to the rotor assembly, there is a virtual eccentricity when the base 14 is driven in eccentric motion.

The sanding tool 100 further includes a support for forming or supporting the eccentric structure 18; the support is connected to the rotor assembly; further, the support member is sleeved to the outside of the rotor assembly. The base 14 is formed with a mounting hole for mounting the base 14 to the motor 15; the support member is located outside the mounting hole. As an alternative embodiment, the sanding tool 100 further comprises a support for forming or supporting the eccentric structure 18; the support comprises a connection portion for enabling connection with the rotor assembly; the base 14 is formed with a mounting hole for mounting the base 14 to the motor 15; the connecting portion is located outside the mounting hole, and with prior art sanding tools, the eccentric shaft connecting the motor shaft is typically mounted into the mounting hole of the base. In the present embodiment, the support is embodied as a fan 16. A fan 16 is attached to the outside of the rotor assembly of the motor 15 and an eccentric 18 is mounted or integrally formed with the fan 16. When the motor 15 rotates to drive the fan 16 to rotate together, because the fan 16 is asymmetric with respect to the motor axis 101, an eccentric force and/or an eccentric moment is generated when the motor 15 rotates, and the base 14 is driven to perform an eccentric motion on the surface of the workpiece. Of course, it will be appreciated that the particular configuration of the support is not limited to fans.

The fan 16 in this embodiment is also used for sucking dust, and the fan 16 rotates with the motor 15 to suck dust on the surface of the workpiece into the dust collecting device 12 during the grinding operation of the grinding tool 100. In the present embodiment, the fan 16 is a centrifugal fan, but may be an axial fan. The fan 16 includes an impeller 161 and blades 162, and the blades 162 are mounted to the impeller 161 or integrally formed with the impeller 161.

The eccentric structure 18 is disposed at the lower portion of the blades 162 of the fan 16 and extends along the circumferential direction of the motor 15, and in the present embodiment, the eccentric structure 18 may be integrally formed with the fan 16 or may be separately formed and fixedly mounted to the fan 16. Specifically, the eccentric structure 18 is an eccentric block, in this embodiment, the radial cross section of the eccentric block is a sector, the axial cross section of the eccentric block is a rectangle, the eccentric block is arranged between the blades 162 of the fan 16 along the circumferential direction of the motor axis 101 and is connected to the impeller 161 of the fan 16 along the radial direction, and of course, the specific structure of the eccentric structure 18 may be other shapes, for example, the uneven arrangement of the blades 162 of the fan 16 causes the mass of the fan 16 to be unevenly distributed about the motor axis 101, so as to form the eccentric structure 18. The specific implementation form of the eccentric structure 18 is not limited herein, as long as the eccentric structure is disposed on the rotor assembly of the motor 15 or on the support member, and can implement the eccentric motion of the base 14 of the grinding tool 100.

Compared with the traditional grinding tool structure, the eccentric structure 18 of the utility model is combined to the fan 6, so that the fan 16 has the functions of dust collection, heat dissipation and eccentric force generation; meanwhile, the fan 16 is not installed with the motor 15 up and down along the axial direction of the motor 15, but is sleeved outside the rotor assembly of the motor 15, specifically, outside the rotor assembly of the outer rotor motor 15, so that the volume and the axial height of the polishing tool 100 are reduced, the mass is reduced, the operation of a user is facilitated, and the use fatigue of the user is reduced. At the same time, the absence of a drive assembly and the design and mounting of the eccentric configuration 18 results in a reduction in idle power of the sanding tool 100, which is more energy efficient.

To summarize, the quality, size, and idle power of the sanding tool 100 are improved. Specifically, the weight of the sanding tool 100 in this embodiment is reduced to 400-550 grams; the maximum height of the sanding tool 100 is reduced to 100-125 mm, and the holding height (the maximum height of the holding part 131 from the bottom surface 14 a) is reduced to 90-99 mm; when the sanding tool 100 is unloaded, the output power of the motor 15 is not less than 40W and not more than 50W. In this embodiment, the weight of the sanding tool 100 (excluding the weight of the battery pack 11) is about 550 grams, the maximum height of the sanding tool 100 (without the battery pack 11 installed) is about 125 mm, the grip height is about 99 mm, and the idle power of the sanding tool 100 is about 48W.

The radius of rotation of the base 14 in circular motion about its central axis during operation of the sanding tool 100 is the working eccentricity of the sanding tool 100. We have analyzed that when the eccentric configuration 18 is designed as above, the working eccentricity e of the sanding tool 100 is related to the following variables:

mass m of the base 14₁;

Mass m of the motor 15₂;

Mass m of eccentric mass₃;

The stiffness k of the flexible portion 171;

the eccentric radius r of the eccentric mass;

the motor 15 is rotated at an angular rate omega,

that is, the working eccentricity e of the sanding tool 100 satisfies the functional relationship with the several parameters:

e = f(m₁,m₂,m₃,k,r,ω)；

the method specifically comprises the following steps: e = m₃ω²r/(m₁+m₂+m₃)ω²-k

Wherein, the eccentric radius r of the eccentric structure 18 is the distance from the gravity center G of the eccentric structure 18 to the motor axis 101; it can be derived by a univariate analysis method that the change in the eccentric radius r of the eccentric mass has the greatest effect on the working eccentricity e of the sanding tool 100, so that a better working eccentricity e is obtained by setting the eccentric radius r of the eccentric mass with other variables determined. In this embodiment, the eccentric radius r of the eccentric mass is greater than or equal to 2 mm and less than or equal to 4 mm, and further, the eccentric radius r of the eccentric mass is greater than or equal to 2 mm and less than or equal to 3 mm. In the present embodiment, the working eccentricity e of the sanding tool 100 is greater than or equal to 0.5 mm and less than or equal to 2 mm, and further, the working eccentricity e of the sanding tool 100 is greater than or equal to 0.7 mm and less than or equal to 1 mm, specifically, 0.8 mm. The reasonable setting of the working eccentricity e can improve the grinding ability and shock resistance of the grinding tool 100. The motor 15 is a brushless motor 15, and the rotation speed of the motor 15 is 12000 rpm or more, and the rotation speed of the motor 15 is 14000 rpm or more, in this embodiment, the rotation speed of the motor 15 is 15000 rpm.

Fig. 12 is a schematic diagram showing a partial structure of an abrasive tool according to a second embodiment of the present invention, which is different from the abrasive tool 100 according to the first embodiment in that the abrasive tool according to the present embodiment further includes a counterweight structure 29 mounted on the fan 26 in addition to the eccentric structure 28 mounted on the fan 26, the counterweight structure 29 and the eccentric structure 29 are substantially opposite to each other with respect to the motor axis 201, but the centers of gravity of the eccentric structure 28 and the counterweight structure 29 are respectively located on two upper and lower planes perpendicular to the motor axis 201, that is, there is a certain height difference between the centers of gravity of the eccentric structure 28 and the counterweight structure 29 in the upper and lower directions along the axial direction. In fact, it is the difference in height of the centers of gravity of the eccentric 28 and counterweight 29 that is used to generate the moment. In addition, the eccentric structure 28 and the counterweight structure 29 have different masses, and the eccentric structure 28 and the counterweight structure 29 may be disposed asymmetrically with respect to the fan 26, i.e., at a certain mounting angle, and the difference in mass between them or/and the mounting angle is used to generate a force and a deflection moment. In this embodiment, the working eccentricity of the grinding tool is the same as that in the first embodiment, but it should be noted that the working eccentricity e can be adjusted by adjusting the counterweight structure, so as to better satisfy the grinding capability and the shock absorption requirement of the grinding tool. For the parts adapted to the grinding tool in the first embodiment, the description thereof is omitted.

As shown in fig. 13, a third embodiment of the present invention provides a grinding tool 300. Grinding tool 300 includes base 1, casing 2 and motor 3, and the inside cavity of casing 2 forms accommodation space 21, and casing 2 sets up on base 1 and is connected with base 1 flexonics, and motor 3 sets up in accommodation space 21 of casing 2 and passes the bottom opening of casing 2 and be connected with base 1, and motor 3's stator 31 is connected with base 1, is provided with eccentric structure 33 on motor 3's the rotor subassembly. In the present embodiment, the sanding tool 300 is embodied as a sander.

The rotatory in-process of rotor subassembly, eccentric structure 33 produces the centrifugal force of turnover and transmits for base 1, realizes base 1's eccentric motion, has simplified the structure, has reduced the volume, and the cost is reduced reduces the vibration when the high rotational speed of working process, and effective noise reduction alleviates the noise and to crowd's harm on every side. The flexible connection between the base 1 and the housing 2 allows relative displacement between the base 1 and the housing 2, so that the housing 2 is not damaged when the base 1 moves eccentrically.

The motor 3 may be an inner rotor motor or an outer rotor motor, and the eccentric structure 33 may be disposed on a rotor assembly of the inner rotor motor or on a rotor assembly of the outer rotor motor. In this embodiment, the motor 3 is a brushless motor, and has good heat dissipation performance and high working efficiency. The motor 3 is an external rotor motor, and the eccentric structure 33 is positioned on an external rotor component 32 of the external rotor motor.

The stator 31 is fixed on the base 1 by a fastening mechanism, and the rotating shaft 34 of the motor 3 passes through the central hole of the stator 31 and is connected with the stator 31 by a first bearing 35 and a second bearing 36. The first bearing 35 and the second bearing 36 are mounted on a bearing housing. The rotor assembly 32 is fixedly connected to the rotating shaft 34. Eccentric structures 33 are disposed on the outer peripheral surface of rotor assembly 32, and eccentric structures 33 are non-uniformly distributed about axis 341 of rotor assembly 32, specifically, eccentric structures 33 are fanned about axis 341 of rotor assembly 32.

The end of the rotating shaft 34 away from the base 1 is provided with a fan 37, and the fan 37 is driven by the rotating shaft 34 to rotate for dissipating heat of the polishing tool 300.

As shown in fig. 14, the base 1 and the housing 2 are connected by a plurality of support members 4. The support member 4 is embodied as an elastic member. When the base 1 moves eccentrically, the supporting component 4 deforms elastically, the protective shell 2 cannot be damaged, and when the base 1 stops moving, the elastic deformation recovers. The lower end of the supporting component 4 is fixedly connected with the base 1, the upper end of the supporting component 4 is provided with a stud 41, and the stud 41 is in threaded connection with the shell 2. In the present embodiment, the support member 4 is made of a rubber material.

As shown in fig. 15, the four supporting members 4 are uniformly spaced on the base 1, and specifically, the four supporting members 4 are located near four vertices of the base 1. In the present embodiment, the eccentric structure 33 is an eccentric mass protruding in a radial direction of the rotor assembly 32.

As shown in fig. 13-16, the sanding tool 300 further includes a controller 5, the controller 5 being located within the housing 2 and electrically connected to the motor 3. The controller 5 is connected with alternating current to control the motor 3 to operate. As an alternative embodiment, the controller 5 may also be connected to direct current to control the operation of the motor 3.

As shown in fig. 17 and 18, the housing 2 includes a grip portion 22 for gripping by a user. The holding part 22 can be provided with a switch, and when a user holds the electric appliance, the switch can be conveniently triggered to control the start and stop of the motor 3.

During the use, set up the piece of polishing of a piece of polishing and so on in base 1 below, the user is handheld in the portion 22 of gripping of casing 2, through switch start polishing tool 300 back, because be provided with eccentric structure 33 on motor 3's the rotor subassembly 32, motor 3 has centrifugal motion's trend, and then directly drives base 1 through motor 3 and realizes eccentric motion for the piece of polishing is at the continuous friction of workpiece surface, realizes polishing to the work piece.

For the parts of the first embodiment that are suitable for this embodiment, they may be applied to this embodiment, and detailed description is omitted.

Fig. 19 shows a fourth embodiment of the present invention, in which the same or corresponding parts as the third embodiment are given the same reference numerals as the third embodiment. For the sake of simplicity, only the points of difference between the fourth embodiment and the third embodiment will be described. The difference between the two is that the motor 3 in this embodiment is a motor with brushes 6, the brushes 6 being located within the housing 2. The wire can be broken in a fatigue way in the reciprocating oscillation process, and the electric brush 6 is more reliable in structure relative to the wire and has no risk of breakage.

A fifth embodiment of the present invention, as shown in fig. 20, provides a grinding tool 500. The grinding tool 500 of the present embodiment has the same eccentric structure as the grinding tool 100 of the first embodiment, and is different from the overall structure arrangement, and only the difference between the two will be described below.

As shown in fig. 20 to 25, an abrading tool 500 includes a battery pack 51, a housing 53, a base 54, and a motor 55. The motor 55 includes a stator assembly and a rotor assembly, and the rotor assembly includes a rotor shaft that can rotate around a motor axis 501; the battery pack 51 is used to supply power to the motor 55, and the battery pack 51 is mounted to the housing 53. In the present embodiment, the housing 53 surrounds a housing space formed to accommodate the motor 55, that is, the housing 53 for mounting the battery pack 51 and accommodating the motor 55 is the same housing 53. As an alternative embodiment, the housing 53 includes a first housing for mounting the battery pack 51 and a second housing surrounding a receiving space formed to receive the motor 55, and the first housing is directly or indirectly connected to the second housing. The base 54 includes a bottom surface 541 for mounting the polishing member, in this embodiment, the polishing member is mounted below the base 54, the bottom surface 541 is the bottom surface of the base 54, and the polishing member is mounted to the bottom surface 541 by clamping, bonding, or the like.

The housing 53 has a battery pack mounting surface 531 for mounting the battery pack 51, the battery pack mounting surface 531 is in surface contact with the battery pack 51, the battery pack mounting surface 531 may be a flat surface or a curved surface, and the battery pack mounting surface 531 may be a continuous surface or a plurality of discontinuous surfaces.

At least a part of the battery pack mounting surface 531 is disposed obliquely with respect to the bottom surface 541, and a projection of the battery pack mounting surface 531 on the bottom surface 541 is located within a boundary of the bottom surface 541. In this embodiment, when the grinding tool 500 is in operation, the bottom surface 541 is substantially parallel to the surface of the workpiece to be ground, the first mounting surface 531a and the second mounting surface 531b are both disposed obliquely with respect to the bottom surface 541, and projections of the first mounting surface 531a and the second mounting surface 531b on the plane where the bottom surface 541 is located are both located within the boundary of the bottom surface 541. This design has reduced the dead angle of polishing of grinding tool 500 in actual operation for grinding tool 500 has the bigger scope of polishing, thereby has improved grinding tool 500's practicality.

The battery pack mounting surface 531 is provided at the front end of the housing 53 in the front-rear direction as shown in fig. 20, and after the battery pack 51 is mounted to the housing 53, the lengthwise direction of the battery pack 51 is parallel to the insertion direction 51' of the battery pack 51, and the thicknesswise direction of the battery pack 51 is perpendicular to the lengthwise direction of the battery pack 51, that is, the battery pack 51 is freely extendable in the thicknesswise direction thereof without being limited by the dimension of the housing 53. This makes grinding tool 500 can the battery package of different models of adaptation, satisfies different operating modes, different users' demand to the practicality is stronger.

The projection of the battery pack 51 on the plane of the bottom surface 541 is a battery pack projection, and the ratio of the area of the battery pack projection located in the boundary of the bottom surface 541 to the area of the battery pack projection is not less than 0.7 and not more than 1. This allows the battery pack 51 to remain attached to the housing 53 while maintaining a greater sanding range for the sanding tool 500. Since the battery packs 51 of different sizes have different sizes, the ratio of the projected area of the battery pack located within the boundary of the bottom surface 541 to the projected area of the battery pack is between 0.7 and 1, and preferably, the ratio of the projected area of the battery pack located within the boundary of the bottom surface 541 to the projected area of the battery pack is 0.8 or more and 1 or less. In this embodiment, the polishing tool 500 may use at least two sets of cells or three sets of cells connected in parallel as the battery pack 51.

At least part of the battery pack mounting surface 531 is parallel to the length direction of the battery pack 51, and an included angle formed by at least part of the battery pack mounting surface 531 and the bottom surface 541 is greater than or equal to 45 degrees and less than 90 degrees in the present embodiment, the first mounting surface 531a is parallel to the length direction of the battery pack 51, an included angle β formed by the first mounting surface 531a and the bottom surface 541 is greater than or equal to 45 degrees and less than 90 degrees, preferably, an included angle β formed by the first mounting surface 531a and the bottom surface 541 is greater than or equal to 60 degrees and less than 85 degrees, and in the present embodiment, an included angle β formed by the first mounting surface 531a and the bottom surface 541 is about.

Specifically, the battery pack 51 is disposed obliquely with respect to the base 54, and the lower end of the battery pack 51 is inclined outward with respect to the bottom surface 541 in the up-down direction shown in fig. 20. The inclination direction and the inclination angle of the battery pack 51 relative to the base 54 can make the user more comfortable to hold in actual operation, and at the same time, make the structure of the whole machine more compact.

The housing 53 has a bisecting plane 532, the housing 53 is substantially symmetrical about the bisecting plane 532, and in fact, the housing 53 is a two-half housing that is substantially symmetrical about the bisecting plane 532, and the battery pack mounting surface 531 is disposed on the housing 53 and is substantially symmetrical about the bisecting plane 532. At least part of the battery pack mounting surface 531 is perpendicular to the median plane 532, and in the present embodiment, the first mounting surface 531a and the second mounting surface 531b are perpendicular to the median plane 532.

The housing 53 includes a holding portion 533 to be held by a user, and at least a portion of the holding portion 533 and at least a portion of the battery pack mounting surface 531 are respectively disposed on both sides of the motor axis 501 in a direction perpendicular to the motor axis 501. The base 54 moves centering on a central axis which is arranged coaxially with the motor axis 501. That is, at least part of the grip 533 and at least part of the battery pack mounting surface 531 are respectively provided on both sides of the motor axis 501 in a direction perpendicular to the motor axis 501. When the user operates the grinding tool 500, a downward acting force is applied to the position of the holding portion 533, and the acting force and the gravity of the battery pack 51 are divided to act on two sides of the central axis of the motor axis 501/the base 54, so that the whole machine is more balanced and is not easy to be inclined.

Further, the holding portion 533 includes a first grip portion 533a for holding a first web of the user, and the first grip portion 533a is curved and recessed toward the inside of the housing 53, so that the holding portion 533 and the first web of the human hand are fitted to each other as much as possible. When the split type thumb rest is used, a user holds the shell 53 with a hand, places the thumb and the rest four fingers on the two sides of the middle split surface 532 respectively, and fits the tiger's mouth with the tiger's mouth holding part 533 a. This makes the user more convenient and comfortable to hold. In addition, a middle axial plane is defined, which is perpendicular to the bottom surface 541 and passes through the motor axis 501; that is, the neutral axis plane is a plane passing through the motor axis 501 and perpendicular to the bottom surface 541. The projection of the thumb-tab holding portion 533a on the central axis surface is located within the projection of the battery pack 51 on the central axis surface, that is, in the front-rear direction, the battery pack 51 can substantially completely shield the thumb-tab holding portion 533a, and this design enables the hand of the user to be blocked by the battery pack 51 when the user holds the battery pack, so that the user can use the battery pack more safely in the actual operation, and the hand of the user is prevented from being flushed out of the housing 53 due to a sudden obstacle.

The projection of the housing 53 on the bisecting plane 532 has an extended track 533b, and the extended track 533b of at least a portion of the housing 53 is parallel to the bottom surface 541; further, the projection of the holding portion 533 on the bisecting plane 532 has an extended track 533b, and at least a portion of the extended track 533b of the holding portion 533 is parallel to the bottom surface 541. This design facilitates the application of a vertically downward force by the user to the abrading tool 500. The sanding tool 500 also includes a circuit board 56, the circuit board 56 being used to control the operation of the motor 55, the circuit board 56 being in a plane parallel to the bottom surface 541. That is, the circuit board 56 is disposed in the same direction as at least a portion of the housing 53 or at least a portion of the holding portion 533, and is parallel to the bottom surface 541, which makes the space inside the housing 53 fully utilized, and thus makes the whole structure more compact. Specifically, the circuit board 56 is accommodated in the housing 53 and disposed above the motor 55, and a projection of the circuit board 56 on a plane parallel to the bottom surface 541 is located within a projection of the holding portion 533 on a plane parallel to the bottom surface 541.

As shown in fig. 25, the sanding tool 500 further includes a support assembly, similar to the first embodiment, including a flexible portion 571 and a rigid portion 572, the flexible portion 571 being connected to the housing, the rigid portion 572 including a bottom plate 572a made of an abrasion resistant material and a support column 572b disposed above the bottom plate 572 a.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by adopting equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims (10)

1. An abrading tool comprising:

the motor comprises a stator component and a rotor component, wherein the rotor component comprises a rotor shaft which can rotate by taking the axis of the motor as a shaft;

the battery pack is used for supplying power to the motor;

a housing for mounting the battery pack;

a base including a bottom surface on which a polishing member is mounted;

the shell is provided with a battery pack mounting surface for mounting the battery pack, and the battery pack mounting surface is in surface contact with the battery pack;

the method is characterized in that:

at least part of the battery pack mounting surface is obliquely arranged relative to the bottom surface, and the projection of the battery pack mounting surface on the plane where the bottom surface is located in the boundary of the bottom surface.

2. The abrading tool of claim 1, wherein:

the projection of the battery pack in the plane of the bottom surface is the projection of the battery pack, and the ratio of the area of the projection of the battery pack in the boundary of the bottom surface to the area of the projection of the battery pack is greater than or equal to 0.7 and less than or equal to 1.

3. The abrading tool of claim 1, wherein:

at least part of the battery pack mounting surface is parallel to the length direction of the battery pack; at least part of the battery pack mounting surface and the bottom surface form an included angle which is greater than or equal to 45 degrees and smaller than 90 degrees.

4. The abrading tool of claim 3, wherein:

at least part of the battery pack mounting surface and the bottom surface form an included angle which is greater than or equal to 60 degrees and less than or equal to 85 degrees.

5. The abrading tool of claim 1, wherein:

the housing has a bisecting plane, the housing being substantially symmetrical about the bisecting plane, at least a portion of the battery pack mounting surface being perpendicular to the bisecting plane.

6. The abrading tool of claim 1, wherein:

the shell comprises a holding part for a user to hold, and at least part of the holding part and at least part of the battery pack mounting surface are respectively arranged on two sides of the axis of the motor along the direction perpendicular to the axis of the motor.

7. The abrading tool of claim 6, wherein:

the holding part comprises a first web holding part for holding a first web of a user, and the first web holding part is sunken towards the inside of the shell in an arc shape;

defining a middle axial plane which is perpendicular to the bottom surface and passes through the axis of the motor;

the projection of the tiger-mouth holding part on the central axis surface is positioned in the projection of the battery pack on the central axis surface.

8. The abrading tool of claim 5, wherein:

the projection of the shell on the bisection plane has an extending track, and at least part of the extending track of the shell is parallel to the bottom surface;

the sanding tool further comprises:

a circuit board for controlling the operation of the motor;

the plane of the circuit board is parallel to the bottom surface.

9. The abrading tool of claim 1, wherein:

the sanding tool further comprises:

an eccentric structure for generating an eccentric force or an eccentric moment;

wherein the eccentric structure is mounted to the rotor assembly such that the motor can drive the base to perform an eccentric motion.

10. The abrading tool of claim 9, wherein:

the base moves by taking a central axis as a center, and the central axis and the axis of the motor are coaxially arranged.

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