Eccentric structure of sanding machine

Abstract

The eccentric structure of the sanding machine comprises a shell, a bearing groove is formed in the shell, a first bearing is arranged in the bearing groove, a motor is arranged in the shell and comprises an output shaft, a grinding disc is arranged below the shell, and a second bearing is installed on the grinding disc; the output shaft penetrates through the first bearing and is connected with the impeller, an eccentric column is arranged on one side of the impeller, the axis of the eccentric column deviates from the axis of the impeller, an eccentric hole is formed in the eccentric column, one end of the output shaft is connected into the eccentric hole, and the other end of the output shaft is connected with the impeller. A second bearing is arranged on the outer side of the eccentric column to be connected with the grinding disc, a load block is installed on one side of the impeller, and when the output shaft rotates, the eccentric column and the second bearing start to rotate to enable the grinding disc to generate periodic eccentric motion.

Description

Technical Field

[0001] This application relates to the field of sanding machine technology, and in particular to an eccentric structure for a sanding machine. Background Technology

[0002] A sander (also known as a grinder or sanding machine) is a mechanical device used to grind, polish, or deburr material surfaces. Its core function is to achieve surface smoothing and refinement by having abrasive materials (such as sandpaper, sanding belts, or grinding discs) in contact with the workpiece through rotation, vibration, or linear motion. Compared to traditional rotary or belt sanders, vibratory sanders exhibit significant advantages in fine grinding, complex surface treatment, and high-precision applications due to their unique motion and controllability.

[0003] Vibratory sanders require high-frequency vibration, which necessitates the use of a rotatable eccentric block to assist in the vibration of the sanding disc. For example, a handheld sander disclosed in publication CN217194557U utilizes an output shaft to drive the eccentric block to rotate and assist in the vibration of the sanding disc. However, the weight of the eccentric block must be maintained for vibration, so the eccentric block is often made of metal, which increases manufacturing costs. Therefore, solving the above problem is the purpose of this application.

[0004] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is the closest prior art to this application. Summary of the Invention

[0005] Based on this, this application provides an eccentric structure for a sander to solve one of the aforementioned technical problems.

[0006] The technical solution adopted by this application to solve its technical problem is an eccentric structure of a sander, comprising: a housing, wherein a bearing groove is provided inside the housing, a first bearing is provided in the bearing groove, a motor is provided inside the housing, the motor includes an output shaft, a grinding disc is provided below the housing, and a second bearing is installed on the grinding disc; an impeller, wherein the output shaft passes through the first bearing and is connected to the impeller, an eccentric column is provided on one side of the impeller, the axis of the eccentric column is offset from the axis of the impeller, an eccentric hole is provided on the eccentric column, one end of the output shaft is connected to the eccentric hole, a second bearing is provided on the outer side of the eccentric column to connect to the grinding disc, and a load block is installed on one side of the impeller. When the output shaft rotates, the eccentric column and the second bearing will start to rotate, causing the grinding disc to produce periodic eccentric motion.

[0007] In some embodiments, the impeller has a connection hole, the load block is a screw post, and the screw post is fixedly disposed on the connection hole.

[0008] In some embodiments, the eccentric hole is a D-shaped hole, and the end of the output shaft connected to the eccentric hole is a D-shaped shaft.

[0009] In some embodiments, blades are provided on both sides of the impeller.

[0010] In some embodiments, the eccentricity of the eccentric column is between 0.3 mm and 2 mm.

[0011] In some embodiments, both the impeller and the eccentric column are made of plastic.

[0012] The beneficial effects of this application are as follows: the eccentric column made of plastic is used to connect with the bearing and is designed to be offset from the impeller shaft. At the same time, the load block can cooperate with the centrifugal rotation of the bearing. This allows the output shaft to drive the grinding disc to vibrate when it rotates, eliminating the presence of the eccentric block in the traditional vibratory sander and effectively saving costs. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a cross-sectional structural diagram of this application.

[0015] Figure 2 This is a schematic diagram of the three-dimensional structure of the impeller in this application.

[0016] Figure 3 This is a schematic diagram of the impeller connection structure of this application.

[0017] Explanation of reference numerals in the attached diagram: 1. Housing; 2. Motor; 3. Output shaft; 4. Bearing groove; 5. First bearing; 6. Grinding disc; 7. Second bearing; 8. Impeller; 9. Eccentric column; 10. Eccentric hole; 11. Load block; 12. Connecting hole. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. In addition, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those of ordinary skill in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection of this application.

[0019] In the embodiments of this application, please refer to Figure 1-3 As shown, this application provides an eccentric structure for a sander, mainly comprising: a housing 1, a bearing groove 4 inside the housing 1, a first bearing 5 inside the bearing groove 4, a motor 2 inside the housing 1, the motor 2 including an output shaft 3, a grinding disc 6 below the housing 1, and a second bearing 7 mounted on the grinding disc 6; an impeller 8, the output shaft 3 passing through the first bearing 5 and connected to the impeller 8, an eccentric column 9 on one side of the impeller 8, the axis of the eccentric column 9 being offset from the axis of the impeller 8, an eccentric hole 10 on the eccentric column 9, one end of the output shaft 3 being connected to the eccentric hole 10, a second bearing 7 on the outer side of the eccentric column 9 connecting to the grinding disc 6, and a load block 11 mounted on one side of the impeller 8. When the output shaft 3 rotates, the eccentric column 9 and the second bearing 7 will start to rotate, causing the grinding disc 6 to produce periodic eccentric motion.

[0020] Specifically, when the output shaft 3 rotates, it will drive the impeller 8 to rotate. Since the output shaft 3 is located inside the housing 1 and cannot vibrate, the eccentric column 9 that cooperates with the second bearing 7 will drive the bearing to rotate synchronously and produce eccentric motion, which will affect the grinding disc 6 and enable the grinding disc 6 to have a grinding function.

[0021] The following will continue to describe some preferred / improved embodiments based on the above embodiments. Any one of the following embodiments can be selected, or multiple embodiments can be combined.

[0022] Reference Figure 3 As shown, the impeller 8 has a connecting hole 12, and the load block 11 is a screw post. The screw post is fixedly installed on the connecting hole 12. The presence of the screw post can cooperate with the eccentric column 9 to assist the rotation of the second bearing 7, so that the entire grinding disc 6 can vibrate and grind more effectively.

[0023] Specifically, in order for the output shaft 3 to drive the impeller 8 to rotate and thus affect the grinding disc 6, the eccentric hole 10 is a D-shaped hole, and the end of the output shaft 3 connected to the eccentric hole 10 is a D-shaped shaft.

[0024] Preferably, blades are provided on both sides of the impeller 8 in order to dissipate heat from the motor 2 when the impeller 8 rotates and to remove dust during grinding.

[0025] More specifically, the eccentric distance of the eccentric column 9 is between 0.3-2 mm. This setting can limit the vibration amplitude of the grinding disc 6. The smaller the eccentric distance, the smaller the vibration amplitude of the grinding disc 6.

[0026] Preferably, both the impeller 8 and the eccentric column 9 are made of plastic. The plastic material can reduce the weight of the impeller 8 shaft, making the bearing rotate more efficiently.

[0027] The various embodiments of this application have now been described in detail. To avoid obscuring the concept of this application, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0028] Finally, it should be noted that the above description is only a preferred embodiment of this application. The foregoing embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An eccentric structure of a sander, characterized by comprising: Include: The shell is provided with a bearing groove, the bearing groove is provided with a first bearing, the shell is provided with a motor, the motor includes an output shaft, the lower part of the shell is provided with a polishing disc, the polishing disc is provided with a second bearing; Impeller, the output shaft passes through the first bearing and is connected with the impeller, one side of the impeller is provided with an eccentric column, the axis of the eccentric column deviates from the axis of the impeller, the eccentric hole is provided on the eccentric column, one end of the output shaft is connected in the eccentric hole, the outer side of the eccentric column is provided with a second bearing to connect the polishing disc, one side of the impeller is provided with a load block, when the output shaft rotates, the eccentric column will rotate with the second bearing to make the polishing disc produce periodic eccentric motion.

2. The eccentric structure of a sander according to claim 1, wherein The connecting hole is provided on the impeller, the load block is a screw column, and the screw column is fixedly arranged on the connecting hole.

3. The eccentric structure of a sander according to claim 1, wherein The eccentric hole is a D-shaped hole, and the end of the output shaft connected with the eccentric hole is a D-shaped shaft.

4. The eccentric structure of a sander according to claim 1, wherein Both sides of the impeller are provided with blades.

5. The eccentric structure of a sander according to claim 1, wherein The eccentric distance of the eccentric column is between 0.3mm and 0.2mm.

6. The eccentric structure of a sander according to claim 1, wherein The impeller and the eccentric column are made of plastic material.

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