Sander

Abstract

The application provides a sander, which comprises a shell, a motor kept in the shell, a sanding disc driven by the motor and a braking element for reducing the speed of the sanding disc. The braking element comprises a mounting portion mounted on the shell, a plurality of pressing protrusions abutting against the sanding disc and a connecting portion connecting the mounting portion and the pressing protrusions. The connecting portion is elastic. The plurality of pressing protrusions are separately arranged, and an air passage is formed between two adjacent pressing protrusions. Dust on the braking element can be removed through the air passage, and the plurality of pressing protrusions vibrate due to friction with the sanding disc, so that the air passage is not easily blocked.

Description

Technical Field

[0001] This application relates to the field of power tools, and more particularly to a sander. Background Technology

[0002] US Patent 5679066A discloses a sander in which the grinding disc is braked by an annular braking element arranged in the housing. The annular braking element is made of an elastic material, and the braking force can be repeatedly and precisely adjusted to decelerate the grinding disc. However, the area above the annular braking element is prone to accumulating dust generated during grinding, requiring manual cleaning by the user. Summary of the Invention

[0003] This application provides a sanding machine with good dust collection effect.

[0004] Specifically, this application provides a sander, including a housing, a motor held in the housing, a sanding disc driven by the motor, and a braking element for decelerating the sanding disc. The braking element includes a mounting part installed in the housing, a plurality of pressing protrusions abutting against the sanding disc, and a connecting part connecting the mounting part and the pressing protrusions. The connecting part is elastic. The plurality of pressing protrusions are arranged separately, and an air channel is formed between two adjacent pressing protrusions.

[0005] Furthermore, the braking element is annular, with multiple pressure protrusions evenly arranged along the circumference of the annulus.

[0006] Furthermore, in the circumferential direction of the ring, the size of the pressure protrusion is smaller than the size of the air channel.

[0007] Furthermore, the housing is provided with a dust exhaust channel, and the air channel is connected to the dust exhaust channel.

[0008] Furthermore, the grinding disc is provided with a dust collection hole, which is connected to the dust discharge channel.

[0009] Furthermore, the orthographic projection of the air channel on the grinding disc is located outside the dust collection hole.

[0010] Furthermore, the cross-sectional area of ​​the dust collection hole is larger than the cross-sectional area of ​​the air channel, the cross-section of the dust collection hole is perpendicular to the axis of the motor, and the cross-section of the air channel is perpendicular to the cross-section of the dust collection hole.

[0011] Furthermore, the braking element is made of an elastic material.

[0012] Furthermore, the elastic material is polyurethane.

[0013] The beneficial effects of this application are: dust and debris above the braking element can be discharged through the air passage, and the air passage is not easily blocked due to the vibration generated by the friction of multiple pressure protrusions and the grinding disc. Attached Figure Description

[0014] Figure 1 This is a front view schematic diagram of a sanding machine according to an embodiment of this application.

[0015] Figure 2 yes Figure 1 The diagram shows a cross-sectional view of a sander.

[0016] Figure 3 yes Figure 2 A magnified view of a portion of region A in the middle.

[0017] Figure 4 yes Figure 1 A three-dimensional schematic diagram of the braking element of the sander shown. Detailed Implementation

[0018] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application.

[0019] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the application. Unless otherwise defined, the technical or scientific terms used in this application should be understood in their ordinary sense by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, “a” or “one,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. “A plurality” or “several” indicates two or more. Unless otherwise stated, the terms “front,” “rear,” “lower,” and / or “upper,” and similar terms are for ease of description only and are not limited to a location or spatial orientation. The terms “comprising,” “including,” and similar terms mean that the elements or objects preceding “comprising,” encompass the elements or objects listed following “comprising,” and their equivalents, and do not exclude other elements or objects. The terms “connected,” “linked,” and similar terms are not limited to physical or mechanical connections and can include electrical connections, whether direct or indirect. The singular forms “a,” “the,” and “the” used in this application specification and appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0020] Please combine Figure 1 and Figure 2 This application provides a sanding machine, which includes a housing 1, a motor 2 installed inside the housing, a sanding disc 3 driven by the motor, a braking element 4 for decelerating the sanding disc, and a switch 5 for controlling the working state of the motor. An eccentric mechanism can be provided between the motor 2 and the sanding disc 3 to convert the rotation of the motor 2 into oscillating reciprocating motion. The motor 2 can be connected to an AC power source via a cable or powered by a DC power source.

[0021] The housing 1 has a space for accommodating components such as the motor 2, switch 5, and eccentric structure, as well as a dust collection channel 11 communicating with the space. A dust bag can be fixed to the end of the dust collection channel 11. Dust is drawn into the dust collection channel 11 by the suction fan 21 of the motor 2 and then into the dust bag. Of course, the dust collection channel can also be directly connected to a vacuum cleaner. The cooling fan 22 of the motor 2 is used to draw in cool air from the air inlet 12. The cool air carries away heat after passing through the motor and other components and flows out through the air outlet 13.

[0022] Please combine Figure 3 and Figure 4The braking element 4 includes a mounting portion 41 installed on the housing 1, a plurality of pressing protrusions 42 abutting against the grinding disc, and a connecting portion 43 connecting the mounting portion 41 and the pressing protrusions 42. The mounting portion 41 is snapped into the housing 1. In this embodiment, the housing can be understood as the sum of components that mainly serve to fix and support and are always in a static state. The plurality of pressing protrusions 42 are arranged separately, and an air channel 40 is formed between two adjacent pressing protrusions 42. The air channel 40 is connected to the dust exhaust channel 11 to exhaust dust and debris above the braking element 4.

[0023] The connecting portion 43 is elastic, allowing the braking element 4 to undergo elastic deformation when in contact with the abrasive disc 3, achieving the desired deceleration. Optionally, the braking elements 4 are all made of elastic material, preferably polyurethane (TPU). When the motor 2 is started, the pressing protrusion 42 of the braking element 4 abuts against the brake disc 3, causing high-frequency vibration. During high-frequency vibration, the air passage 40 is less likely to be blocked by dust, thus ensuring that dust in the area above the braking element 4 can be collected.

[0024] In this embodiment, the sander is a circular sander, with the corresponding grinding disc 3 being disc-shaped. Correspondingly, the braking element 4 is annular, with multiple pressure protrusions 42 evenly arranged along the circumference of the annulus. Similarly, multiple air channels 40 are also evenly arranged along the circumference of the annulus. In the circumferential direction of the annulus, the size of the pressure protrusions 42 is smaller than the size of the air channels 40. That is, the air channels 40 are larger, further reducing the possibility of clogging during dust collection.

[0025] The grinding disc 3 has a through dust collection hole 31, the extension direction of which is parallel to the motor axis. The dust collection hole 31 communicates with the dust discharge channel 11 to remove dust from the workpiece surface. Dust above the braking element 4 is carried to this area by airflow during workpiece processing, but the main dust during grinding remains on the workpiece surface. Therefore, preferably, the orthographic projection of the air channel 40 on the grinding disc 3 is located outside the dust collection hole 31. This ensures that dust on the workpiece surface is preferentially removed, followed by dust above the braking element 4.

[0026] More preferably, the cross-sectional area of ​​the dust collection hole 31 is larger than the cross-sectional area of ​​the air channel 40. The cross-section of the dust collection hole 31 is perpendicular to the axis of the motor 2, and the cross-section of the air channel 40 is perpendicular to the cross-section of the dust collection hole 31, thereby ensuring that dust and debris on the surface of the workpiece can be effectively discharged, including larger dust and debris.

[0027] Dust and debris above the braking components can be discharged through the air passage, and the air passage is not easily blocked due to the vibration generated by the friction of multiple pressure protrusions and the grinding disc.

[0028] The above description is merely a preferred embodiment of this application and is not intended to limit this application in any way. Although this application has disclosed the preferred embodiment as above, it is not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this application. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the content of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A sander, comprising a housing, a motor held within the housing, a sanding disc driven by the motor, and a braking element for decelerating the sanding disc, characterized in that, The braking element includes a mounting part installed on the housing, a plurality of pressure protrusions abutting against the grinding disc, and a connecting part connecting the mounting part and the pressure protrusions, wherein the connecting part is elastic; Multiple pressure protrusions are set separately, and an air channel is formed between two adjacent pressure protrusions.

2. The sander according to claim 1, characterized in that, The braking element is annular, with multiple pressure protrusions evenly arranged along the circumference of the annulus.

3. The sander according to claim 2, characterized in that, In the circumferential direction of the ring, the size of the pressure protrusion is smaller than the size of the air passage.

4. The sander according to claim 1, characterized in that, The housing is provided with a dust exhaust channel, and the air channel is connected to the dust exhaust channel.

5. The sander according to claim 4, characterized in that, The grinding disc is provided with a dust collection hole, which is connected to the dust discharge channel.

6. The sander according to claim 5, characterized in that, The orthographic projection of the air channel on the grinding disc is located outside the dust collection hole.

7. The sander according to claim 5, characterized in that, The cross-sectional area of ​​the dust collection hole is larger than the cross-sectional area of ​​the air passage. The cross-section of the dust collection hole is perpendicular to the axis of the motor, and the cross-section of the air passage is perpendicular to the cross-section of the dust collection hole.

8. The sander according to claim 1, characterized in that, The braking element is made of an elastic material.

9. The sander according to claim 8, characterized in that, The elastic material is polyurethane.

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