CN110142672B

CN110142672B - Polishing tool

Info

Publication number: CN110142672B
Application number: CN201810141205.XA
Authority: CN
Inventors: 吹拔正敏; 韩冰
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2018-02-11
Filing date: 2018-02-11
Publication date: 2022-11-15
Anticipated expiration: 2038-02-11
Also published as: CN110142672A

Abstract

The invention discloses a polishing tool, which belongs to the technical field of polishing equipment and comprises a base, a shell and a motor, wherein the shell is arranged on the base and flexibly connected with the base; the motor set up in the casing, the stator of motor with the base is connected, be provided with the unbalance body on the rotor of motor. In the process of rotor rotation, the unbalanced body generates the centrifugal force of turnover and transmits the centrifugal force to the base, so that the eccentric motion of the base is realized, the structure is simplified, the size is reduced, the cost is reduced, the vibration at high rotating speed in the working process is reduced, the noise is effectively reduced, and the harm of the noise to surrounding people is reduced.

Description

Polishing tool

Technical Field

The invention relates to the technical field of polishing equipment, in particular to a polishing tool.

Background

The sander is receiving more and more attention as a sanding and polishing tool. Existing sanders typically include: the eccentric motion of the sander is realized by driving the eccentric mechanism to rotate by a motor shaft, and a soft support of the vibration support and a rigid support of the eccentric shaft connected with a bearing of the base plate are arranged between the sander shell and the base plate. Because the bottom plate bearing is rotatable, the bottom plate can eccentrically move, and the vibration bracket is used for limiting the rotation of the bottom plate; the motor is fixed on the shell, and power is transmitted to the bottom plate through the output shaft.

Above-mentioned structure needs to have the quality that other counter weight structure comes the balanced bottom plate, the counter weight structure generally is the balancing piece, the size and the position of balancing piece need be through calculating, and make out and always produce the error of size and position, it is big to lead to the unbalanced vibration of eccentric system, not only bring the rise of cost, balancing piece and eccentric shaft are no matter how to place and all can occupy certain axial space moreover, make the grinder structure complicated, the volume is great, especially can produce very big vibration when the rotational speed is high, the noise is great.

Disclosure of Invention

The invention aims to provide a grinding tool to solve the technical problems of large volume, high noise and complex structure in the prior art.

As the conception, the technical scheme adopted by the invention is as follows:

an abrading tool comprising:

a base;

the shell is arranged on the base and is flexibly connected with the base;

the motor is arranged in the shell, a stator of the motor is connected with the base, and an unbalanced body is arranged on a rotor of the motor.

Wherein the motor is a brushless motor.

The motor is an outer rotor motor, and the unbalance body is positioned on an outer rotor of the outer rotor motor.

The stator is fixed on the base through a fastening mechanism, and a rotating shaft of the motor penetrates through a center hole of the stator and is connected with the stator through a first bearing and a second bearing.

The outer rotor is sleeved on the rotating shaft and is fixedly connected with the rotating shaft.

Wherein the imbalance bodies are unevenly distributed about an axis of the outer rotor.

Wherein, the base is connected with the shell through a plurality of elastic pieces.

The lower end of the elastic piece is fixedly connected with the base, the upper end of the elastic piece is provided with a stud, and the stud is in threaded connection with the shell.

Wherein the elastic member is made of a rubber material.

The motor is characterized by further comprising a controller, wherein the controller is located in the shell and electrically connected with the motor.

The invention has the beneficial effects that:

the grinding tool is flexibly connected with the base through the shell, the stator of the motor is connected with the base, and the unbalanced body is arranged on the rotor of the motor, so that the unbalanced body generates a circulating centrifugal force and transmits the centrifugal force to the base in the rotation process of the rotor, and the eccentric motion of the base is realized. Because an eccentric shaft is omitted, the structure is simplified, the size is reduced, the cost is reduced, the vibration at high rotating speed in the working process is reduced, the noise is effectively reduced, and the harm of the noise to surrounding people is reduced.

Drawings

FIG. 1 is a cross-sectional view of an abrading tool provided in accordance with one embodiment of the present invention;

FIG. 2 is a front view of an abrasive tool of the first embodiment of the present invention with the housing omitted;

FIG. 3 is a top view of FIG. 2;

FIG. 4 isbase:Sub>A sectional view taken along line A-A of FIG. 3;

FIG. 5 is a front view of an abrading tool provided in accordance with one embodiment of the present invention;

FIG. 6 is a top view of an abrading tool provided in accordance with one embodiment of the present invention;

fig. 7 is a sectional view of an abrasive tool according to a second embodiment of the present invention.

In the figure:

1. a base; 2. a housing; 3. a motor; 4. an elastic member; 5. a controller; 6. an electric brush;

21. an accommodating cavity; 22. a grip portion;

31. a stator; 32. an outer rotor; 33. an unbalanced mass; 34. a rotating shaft; 35. a first bearing; 36. a second bearing; 37. a fan; 341. an axis;

41. a stud.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.

Referring to fig. 1, an embodiment of the present invention provides an abrasive tool for abrading a workpiece. Grinding tool includes base 1, casing 2 and motor 3, and casing 2's inside cavity forms holding chamber 21, and casing 2 sets up on base 1 and is connected with base 1 flexonics, and motor 3 sets up in casing 2's holding chamber 21 and passes casing 2's bottom opening and be connected with base 1, and motor 3's stator 31 is connected with base 1, is provided with unbalanced mass 33 on motor 3's the rotor. In this embodiment, the abrading tool is a sander.

In the process of rotor rotation, the unbalanced body 33 generates a revolving centrifugal force and transmits the centrifugal force to the base 1, so that the eccentric motion of the base 1 is realized, the structure is simplified, the size is reduced, the cost is reduced, the vibration at high rotating speed in the working process is reduced, the noise is effectively reduced, and the harm of the noise to surrounding people is reduced. The flexible connection is arranged to allow 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 unbalance body 33 may be provided on the rotor of the inner rotor motor or the rotor 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 unbalance body 33 is positioned on an external rotor 32 of the external rotor motor.

The stator 31 is fixed on the base 1 through 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 through 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 outer rotor 32 is fixedly connected with the rotating shaft 34. The unbalancing bodies 33 are disposed on the outer circumferential surface of the outer rotor 32, and the unbalancing bodies 33 are unevenly distributed around the axis 341 of the outer rotor 32, specifically, the unbalancing bodies 33 are distributed in a fan shape around the axis 341 of the outer rotor 32.

The end of the rotating shaft 34 far 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 grinding tool.

Referring to fig. 2, the base 1 and the housing 2 are connected by a plurality of elastic members 4. When the base 1 moves eccentrically, the elastic piece 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 elastic element 4 is fixedly connected with the base 1, the upper end of the elastic element 4 is provided with a stud 41, and the stud 41 is in threaded connection with the shell 2. In the present embodiment, the elastic member 4 is made of a rubber material.

Referring to fig. 3, the four elastic members 4 are uniformly spaced on the base 1, and specifically, the four elastic members 4 are located near four vertices of the base 1. In the present embodiment, the unbalancing body 33 is an eccentric mass protruding in the radial direction of the outer rotor 32.

Referring to fig. 1-4, the sanding tool 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.

Referring to fig. 5 and 6, 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 abrasive paper and so on in base 1 below, the user is handheld in the portion 22 of gripping of casing 2, through switch start grinding tool after, because be provided with unbalanced body 33 on motor 3's the external rotor 32, motor 3 has centrifugal motion's trend, and then directly drives base 1 through motor 3 and realizes eccentric motion for abrasive paper constantly rubs on the workpiece surface, realizes polishing to the work piece.

Example two

Fig. 7 shows a second embodiment, wherein the same or corresponding parts as in the first embodiment are provided with the same reference numerals as in the first embodiment. For the sake of simplicity, only the differences between the second embodiment and the first embodiment will be described. The difference is that the motor 3 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.

The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A sanding machine characterized in that it comprises:

a base;

the shell is arranged on the base and is flexibly connected with the base;

the motor is arranged in the shell, a stator of the motor is connected with the base, and an unbalanced body is arranged on a rotor of the motor and can transmit the generated revolving centrifugal force to the base;

the stator is fixed on the base through a fastening mechanism;

the motor is a brushless motor;

the motor is an outer rotor motor, and the unbalance body is positioned on an outer rotor of the outer rotor motor;

a rotating shaft of the motor penetrates through a center hole of the stator and is connected with the stator through a first bearing and a second bearing;

the outer rotor is sleeved on the rotating shaft and is fixedly connected with the rotating shaft;

the base is connected with the shell through a plurality of elastic pieces.

2. The sander of claim 1, wherein the imbalance is unevenly distributed about an axis of the outer rotor.

3. The sander according to claim 1, wherein the lower end of the elastic member is fixedly connected with the base, and the upper end of the elastic member is provided with a stud which is in threaded connection with the housing.

4. The sander of claim 1, further comprising a controller located within the housing and electrically connected to the motor.

5. The sander as set forth in claim 3, wherein the resilient member is made of a rubber material.