Dustproof structure of electric grinder

Abstract

The utility model discloses a dustproof structure of an electric grinder, and relates to the technical field of electric tools. According to the technical scheme, the motor comprises a machine shell and an axle box which are detachably connected, a motor is arranged in the machine shell, a front bearing and a rear bearing are arranged in the axle box, the front bearing and the rear bearing are arranged in a penetrating and inserting mode through an output shaft, and a rotor mandrel of the motor and the output shaft are coaxially connected through a connecting sleeve. The output shaft is divided into a working section and a rotating section which are fixedly connected, the diameter of the working section is larger than that of the rotating section, gaps are formed in the connecting faces of the front bearing, the working section and the rotating section, and dustproof gaskets are inserted into the gaps and arranged on the rotating section in a sleeved mode. The front bearing has the advantages that the dustproof gasket is arranged on one side of the front bearing and rotates along with the front bearing, dust can be prevented from entering a gap of the inner ring of the bearing, the dustproof gasket and the front bearing rotate together, and mutual abrasion cannot be generated between the dustproof gasket and the front bearing.

Description

Technical Field

[0001] The utility model relates to the technical field of electric tools, in particular to a dustproof structure of an electric grinder. Background Art

[0002] Handheld mold electric grinder is a widely used professional tool, mainly used in the mold industry, jade industry, furniture industry, wood carving industry, handicraft processing industry, etc., with a large market demand. It has the characteristics of simple structure, easy operation, fast processing speed, high efficiency and wide application range.

[0003] When the electric grinder is working, it grinds the workpiece, and a large amount of grinding waste similar to dust will be generated in the grinding process. The electric grinder head will deposit a large amount of grinding waste during long-term operation, causing damage to the electric grinder head, and even worse, causing wear to the entire device, resulting in reduced grinding accuracy and greatly reduced grinding efficiency. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a dust-proof structure of an electric grinder to solve the problems mentioned in the background technology.

[0005] The above-mentioned purpose of the utility model is achieved through the following technical solutions:

[0006] A dustproof structure for an electric grinder comprises a casing and an axle box, wherein the casing and the axle box are detachably connected, a motor is arranged in the casing, a front bearing and a rear bearing are arranged in the axle box, the front bearing and the rear bearing are inserted through an output shaft, a rotor core shaft of the motor and the output shaft are coaxially connected through a connecting sleeve, the output shaft is divided into a working section and a rotating section, and the working section and the rotating section are fixedly connected, the diameter of the working section is larger than the diameter of the rotating section, a gap is arranged at the connecting surface between the front bearing and the working section and the rotating section, a dustproof gasket is inserted in the gap, and the dustproof gasket is sleeved on the rotating section.

[0007] In a preferred example, the utility model can be further configured as follows: the dustproof gasket is connected to the inner ring of the front bearing, the inner diameter of the dustproof gasket is equal to the inner diameter of the front bearing and the outer diameter of the dustproof gasket is smaller than the outer diameter of the front bearing.

[0008] In a preferred example, the utility model can be further configured as follows: a bearing cover is provided on one side of the front bearing, the bearing cover is sleeved on the working section, and the air gaps between the bearing cover, the axle box and the dustproof gasket are in a maze shape.

[0009] In a preferred example, the utility model can be further configured as follows: the bearing cover is provided with an annular groove, a felt ring is clamped in the annular groove, and the felt ring is sleeved on the working section.

[0010] In a preferred example, the utility model can be further configured as follows: the output shaft is provided with an inclined step on one side close to the axle box, and the inclined step is 120-150 degrees along the rotation direction.

[0011] In a preferred example, the present invention can be further configured as follows: the bone position of the axle box is a point support.

[0012] In summary, the present invention includes at least one of the following beneficial technical effects:

[0013] 1. A dustproof gasket is set on one side of the front bearing, and the dustproof gasket rotates with the front bearing to prevent dust from entering the gap of the inner ring of the bearing. The two rotate together, and there will be no mutual wear between the dustproof gasket and the front bearing;

[0014] 2. By making the space between the bearing gland, axle box and dustproof gasket into a maze shape, the path for dust to enter the bearing can be increased, making it more difficult for dust to enter the bearing;

[0015] 3. The felt ring can prevent dust from entering the gap of the dustproof gasket;

[0016] 4. The inclined steps can discharge dust during the high-speed rotation of the output shaft;

[0017] 5. Guide the wind generated by the motor heat dissipation to the front end of the axle box, and blow the air outlet forward toward the output shaft to blow away the dust at the front end of the axle box and reduce the chance of dust entering. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the internal structure of this technical solution;

[0019] Figure 2 It is a partial structural schematic diagram of the technical solution;

[0020] Figure 3 It is a structural schematic diagram of the axle box in this technical solution;

[0021] Figure 4 It is a structural schematic diagram of the output shaft in this technical solution.

[0022] Figure numerals: 1, casing; 2, axle box; 3, motor; 4, front bearing; 5, rear bearing; 6, output shaft; 61, working section; 62, rotating section; 7, rotor core shaft; 8, connecting sleeve; 9, gap; 10, dustproof gasket; 11, bearing cover; 12, annular groove; 13, felt ring; 14, inclined step; 15, air duct; 16, protective cover. DETAILED DESCRIPTION

[0023] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0024] like Figure 1-4 As shown, a dustproof structure of an electric grinder disclosed in the technical solution includes a housing 1 and an axle box 2. The housing 1 and the axle box 2 are detachably connected, and the connection method here can be selected as screw connection. A motor 3 is arranged in the housing 1, and a front bearing 4 and a rear bearing 5 are arranged in the axle box 2. The front bearing 4 and the rear bearing 5 are the same bearings. The naming of the bearings here is based on the position. The front bearing 4 and the rear bearing 5 are inserted through the output shaft 6, and the rotor core shaft 7 of the motor 3 and the output shaft 6 are coaxially connected through the connecting sleeve 8.

[0025] The output shaft 6 is divided into a working section 61 and a rotating section 62, and the working section 61 and the rotating section 62 are fixedly connected, and the fixed connection method here is an integrated setting. A gap 9 is provided at the connection surface between the front bearing 4 and the working section 61 and the rotating section 62, and a dustproof gasket 10 is inserted in the gap 9, and the dustproof gasket 10 is sleeved on the rotating section 62. The diameter of the working section 61 is larger than the diameter of the rotating section 62, and the dustproof gasket 10 can be clamped through the working section 61 and the front bearing 4.

[0026] The dustproof gasket 10 is connected to the inner ring of the front bearing 4. The inner diameter of the dustproof gasket 10 is equal to the inner diameter of the front bearing 4, which is not absolutely equal. It can ensure that dust will not enter the front bearing 4 under the premise of synchronous rotation of the dustproof gasket 10 and the front bearing 4, and the outer diameter of the dustproof gasket 10 is smaller than the outer diameter of the front bearing 4, which will not cause additional damage to the dustproof gasket 10.

[0027] A bearing cover 11 is provided on one side of the front bearing 4, and the bearing cover 11 is sleeved on the working section 61. The air gap between the bearing cover 11, the axle box 2 and the dustproof gasket 10 is maze-like. The maze-like here means that it is set to a structure similar to S, W, etc. to increase the distance of the dust entering the bearing path, making it more difficult for dust to enter the front bearing 4.

[0028] The bearing cover 11 is provided with an annular groove 12 , in which a felt ring 13 is clamped. The felt ring 13 is sleeved on the working section 61 . The felt ring 13 provided here is treated with oil immersion, which can absorb dust and prevent dust from entering the front bearing 4 .

[0029] An inclined step 14 is provided on one side of the output shaft 6 close to the axle box 2 , and the inclined step 14 is 120-150° along the rotation direction. The inclined step 14 can discharge dust during the high-speed rotation of the output shaft 6 .

[0030] The bone position of the axle box 2 is a point support, and at the same time, an air duct 15 is formed to guide the wind generated by the heat dissipation of the motor 3 to the front end of the axle box 2, and the air outlet blows forward toward the output shaft 6 to blow away the dust at the front end of the axle box 2, reducing the probability of dust entering. A protective cover 16 is provided on the outside of the axle box 2 to protect the operator's hands.

[0031] The embodiments of this specific implementation method are all preferred embodiments of the utility model, and are not intended to limit the protection scope of the utility model. Therefore, all equivalent changes made based on the structure, shape, and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A dustproof structure for an electric grinder, comprising a housing (1) and an axle box (2), wherein the housing (1) and the axle box (2) are detachably connected, a motor (3) is arranged in the housing (1), a front bearing (4) and a rear bearing (5) are arranged in the axle box (2), the front bearing (4) and the rear bearing (5) are inserted through an output shaft (6), a rotor core shaft (7) of the motor (3) and the output shaft (6) are coaxially connected through a connecting sleeve (8), and the structure is characterized in that: The output shaft (6) is divided into a working section (61) and a rotating section (62), and the working section (61) and the rotating section (62) are fixedly connected, the diameter of the working section (61) is larger than the diameter of the rotating section (62), a gap (9) is provided between the connecting surfaces of the front bearing (4) and the working section (61) and the rotating section (62), a dustproof gasket (10) is inserted into the gap (9), and the dustproof gasket (10) is sleeved on the rotating section (62).

2. The dust-proof structure of an electric grinder according to claim 1, characterized in that: The dustproof gasket (10) is connected to the inner ring of the front bearing (4), the inner diameter of the dustproof gasket (10) is equal to the inner diameter of the front bearing (4) and the outer diameter of the dustproof gasket (10) is smaller than the outer diameter of the front bearing (4).

3. The dust-proof structure of an electric grinder according to claim 1, characterized in that: A bearing cover (11) is provided on one side of the front bearing (4), and the bearing cover (11) is sleeved on the working section (61). The air gap between the bearing cover (11), the axle box (2) and the dustproof gasket (10) is in a maze shape.

4. The dust-proof structure of an electric grinder according to claim 3, characterized in that: The bearing cover (11) is provided with an annular groove (12), a felt ring (13) is clamped in the annular groove (12), and the felt ring (13) is sleeved on the working section (61).

5. The dust-proof structure of an electric grinder according to claim 1, characterized in that: The output shaft (6) is provided with an inclined step (14) on one side close to the axle box (2), and the inclined step (14) is 120-150 degrees along the rotation direction.

6. The dust-proof structure of an electric grinder according to claim 1, characterized in that: The bone position of the axle box (2) is point-shaped support.

Images