DUSTPROOF STRUCTURE OF GRINDING TOOL HOLDER
A dustproof structure of a grinding tool holder, which comprises a shaft portion and a counterweight portion connected to one end of the shaft portion. The counterweight portion comprises an eccentric block connected to the shaft portion, at least one bearing mounted in the eccentric block, a dustproof ring, and a grinding member assembling head assembled with the bearing. The eccentric block is formed with an assembly port for disposing the bearing and the dustproof ring, the dustproof ring is located on a side of the bearing facing the grinding member assembling head, and formed with a first continuous concave-convex structure on a side away from the bearing, the grinding member assembling head is formed with a second continuous concave-convex structure on a side facing the dustproof ring, the first and second continuous concave-convex structures match with each other and define dust blocking dots.
The invention relates to a grinding tool holder applied to tool grinding machines, and more particularly to a grinding tool holder with a dustproof structure.
BACKGROUND OF THE INVENTIONIn order for the existing tool grinding machine to be capable of driving a grinding member to work by orbital motion or random orbital motion, the tool grinding machine is assembled with the grinding member via a grinding tool holder, such as the grinding tool holders disclosed in U.S. Pat. No. 6,878,049, KR Patent No. 10-2015-0000792, TW Patent No. 439616, U.S. Pat. No. 6,855,040.
The grinding tool holder is driven by a motor of the tool grinding machine, and the grinding tool holder is driven by at least one included bearing and an inertial force generated by the motor to make the grinding tool holder generate orbital motion or random orbital motion. However, since the grinding tool holder is assembled with the grinding member, the grinding tool holder is close to a surface to be ground, and dust generated during a grinding process may float toward the grinding tool holder. In this regard, although the above-mentioned patents are equipped with dustproof designs, most of them are mainly designed to block the path along which dust enters the bearing directly, but it is still easy for the fine dust to enter the bearing through the gaps between the blocking structures to affect the operation or service life of the bearing.
SUMMARY OF THE INVENTIONA main object of the invention is to solve the problem that shielding alone is incapable of preventing dust from entering the bearing through the gaps between the structures in the existing tool grinding machine.
In order to achieve the above object, the invention provides a dustproof structure of a grinding tool holder, the grinding tool holder is assembled with a motor, and the grinding tool holder is assembled with a grinding tool optionally. The grinding tool holder comprises a shaft portion assembled with the motor, and a counterweight portion connected to one end of the shaft portion. The counterweight portion comprises an eccentric block connected to the shaft portion, at least one bearing mounted in the eccentric block, a dustproof ring, and a grinding member assembling head assembled with the at least one bearing. The eccentric block is formed with an assembly port to provide the at least one bearing and the dustproof ring for disposal therein, the dustproof ring is located on a side of the at least one bearing facing the grinding member assembling head, the dustproof ring is formed with a first continuous concave-convex structure on a side distant from the at least one bearing, the grinding member assembling head is formed with a second continuous concave-convex structure on a side facing the dustproof ring, and the first continuous concave-convex structure and the second continuous concave-convex structure coordinate with each other and jointly define a plurality of dust blocking dots.
In one embodiment, the first continuous concave-convex structure comprises a step portion and a branch portion extending from a side of the step portion, the branch portion is horizontal to a surface of the grinding member assembling head facing the dustproof ring.
In one embodiment, the dustproof ring comprises an outer ring edge and an inner ring edge, and the first continuous concave-convex structure is disposed close to the inner ring edge.
In one embodiment, the counterweight portion comprises a limiting ring mounted in the assembly port for limiting a position of the dustproof ring.
In one embodiment, an outer diameter of the limiting ring is larger than an outer diameter of the dustproof ring.
In one embodiment, the shaft portion is formed with an air guide channel communicating with the assembly port, and a mounting groove communicating with the air guide channel to provide for installing a motor paddle, and wherein an airflow is induced into the air guide channel by the mounting groove when the motor rotates.
In one embodiment, the dustproof ring comprises an inclined surface facing the grinding member assembling head.
In one embodiment, the dustproof ring comprises a pushing block disposed on a side facing the at least one bearing to contact with the at least one bearing.
In one embodiment, an outer diameter of the dustproof ring is larger than an outer diameter of the at least one bearing, and an outer diameter of the limiting ring is larger than an outer diameter of the dustproof ring.
Accordingly, compared with the prior art, the grinding tool holder of the invention has the following features: in addition to the dustproof ring, the first continuous concave-convex structure on the dustproof ring further coordinates with the second continuous concave-convex structure on the grinding member assembling head, the first continuous concave-convex structure and the second continuous concave-convex structure jointly define the plurality of dust blocking dots, so that a length of edgewise distance for dust to enter the assembly port is increased, thereby greatly preventing the at least one bearing from operating abnormally due to dust.
The detailed description and technical content of the invention are described below with reference to the accompanying drawings.
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Accordingly, it is mainly the at least one bearing 24 that makes the grinding disc to generate orbital motion (or random orbital motion), although the grinding tool holder 20 is driven by the motor 31. Therefore, a main object of the dustproof structure of the grinding tool holder 20 of the invention is to prevent operation of the at least one bearing 24 from being affected by dust generated by grinding operation.
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Claims
1. A dustproof structure of a grinding tool holder, the grinding tool holder assembled with a motor and provided for a grinding tool to be assembled therewith optionally, the grinding tool holder comprising:
- a shaft portion, assembled with the motor; and
- a counterweight portion, connected to one end of the shaft portion, the counterweight portion comprising an eccentric block connected to the shaft portion, at least one bearing mounted in the eccentric block, a dustproof ring, and a grinding member assembling head assembled with the at least one bearing, wherein the eccentric block is formed with an assembly port to provide the at least one bearing and the dustproof ring for disposal therein, the dustproof ring is located on a side of the at least one bearing facing the grinding member assembling head, the dustproof ring is formed with a first continuous concave-convex structure on a side distant from the at least one bearing, the grinding member assembling head is formed with a second continuous concave-convex structure on a side facing the dustproof ring, and the first continuous concave-convex structure and the second continuous concave-convex structure coordinate with each other and jointly defining a plurality of dust blocking dots.
2. The dustproof structure of the grinding tool holder as claimed in claim 1, wherein the first continuous concave-convex structure comprises a step portion and a branch portion extending from a side of the step portion, the branch portion is horizontal to a surface of the grinding member assembling head facing the dustproof ring.
3. The dustproof structure of the grinding tool holder as claimed in claim 2, wherein the dustproof ring comprises an outer ring edge and an inner ring edge, and the first continuous concave-convex structure is disposed close to the inner ring edge.
4. The dustproof structure of the grinding tool holder as claimed in claim 3, wherein the counterweight portion comprises a limiting ring mounted in the assembly port for limiting a position of the dustproof ring.
5. The dustproof structure of the grinding tool holder as claimed in claim 4, wherein an outer diameter of the limiting ring is larger than an outer diameter of the dustproof ring.
6. The dustproof structure of the grinding tool holder as claimed in claim 4, wherein the shaft portion is formed with an air guide channel communicating with the assembly port, and a mounting groove communicating with the air guide channel to provide for installing a motor paddle, and wherein an airflow is induced into the air guide channel by the mounting groove when the motor rotates.
7. The dustproof structure of the grinding tool holder as claimed in claim 5, wherein the dustproof ring comprises an inclined surface facing the grinding member assembling head.
8. The dustproof structure of the grinding tool holder as claimed in claim 6, wherein the dustproof ring comprises a pushing block disposed on a side facing the at least one bearing to contact with the at least one bearing.
9. The dustproof structure of the grinding tool holder as claimed in claim 6, wherein an outer diameter of the dustproof ring is larger than an outer diameter of the at least one bearing, and an outer diameter of the limiting ring is larger than an outer diameter of the dustproof ring.
10. The dustproof structure of the grinding tool holder as claimed in claim 1, wherein the dustproof ring comprises an inclined surface facing the grinding member assembling head.
11. The dustproof structure of the grinding tool holder as claimed in claim 1, wherein the counterweight portion comprises a limiting ring mounted in the assembly port to limit a position of the dustproof ring.
12. The dustproof structure of the grinding tool holder as claimed in claim 1, wherein the shaft portion is formed with an air guide channel communicating with the assembly port, and a mounting groove communicating with the air guide channel and provided for installing a motor paddle, and wherein an airflow is induced into the air guide channel by the mounting groove when the motor rotates.
Type: Application
Filed: Mar 11, 2022
Publication Date: Sep 14, 2023
Inventors: Ding-Yao CHENG (Taoyuan City), Shao-Kuang LU (Taoyuan City), Wen-Hsien SU (Taoyuan City)
Application Number: 17/692,601