Contact type sealing structure for grinding machine main shaft

Abstract

The utility model discloses a contact type sealing structure for a main shaft of a grinding machine, which comprises a shaft, the shaft is connected with a machine shell through a bearing, a front cover is arranged on one side of the machine shell, a front cover inner ring is arranged on one side of the front cover, a framework oil seal is arranged in the front cover inner ring, an air nozzle is arranged on the front cover, an air channel is arranged in the front cover, and the air channel is communicated with the air nozzle. An annular cavity is formed between the front cover inner ring and the front cover, a plurality of air hole sets are evenly distributed in the front cover inner ring, air flows to the framework oil seal through an air nozzle, an air channel in the front cover, the annular cavity and the air hole sets and is discharged through a cooling channel between the shaft and the front cover inner ring, and therefore heat and grinding wheel scraps are brought out. The sealing structure is simple in structure, convenient to install and machine, capable of effectively cooling the sealing structure and prolonging the service life of sealing, good in dustproof sealing effect and capable of improving the running stability of the main shaft.

Description

Technical Field

[0001] The utility model relates to the technical field of spindle sealing, in particular to a contact type sealing structure for a grinder spindle. Background Art

[0002] The spindle is the shaft that drives the workpiece or tool to rotate on the machine tool. It is mainly used to support the transmission parts and transmit the rotational motion and torque. In the prior art, high-speed spindles are widely used in precision machining. The dust and water resistance requirements of the shaft end are constantly increasing. Due to its structural characteristics, the contact seal generates significant heat, which affects the stability of the spindle. Summary of the invention

[0003] The utility model aims to solve the above technical problems and provide a contact seal structure for a grinding machine spindle, which has a simple structure and has been proven to be able to effectively reduce the temperature of the contact seal, effectively extend the service life of the contact seal, and extend its dustproof and waterproof effects.

[0004] In order to achieve the above technical objectives and meet the above technical requirements, the technical solution adopted by the utility model is: a contact sealing structure for a grinding machine spindle, including a shaft, which is connected to a casing through a bearing, and is characterized in that: a front cover is provided on one side of the casing, a front cover inner ring is provided on one side of the front cover, a skeleton oil seal is provided in the front cover inner ring, an air nozzle is provided on the front cover, a gas channel is provided in the front cover, an annular cavity is provided between the front cover inner ring and the front cover, and a plurality of air hole groups are evenly distributed on the front cover inner ring, and the gas flows to the skeleton oil seal through the air nozzle, the gas channel in the front cover, the annular cavity, and the air hole group, and is discharged through the cooling channel between the shaft and the front cover inner ring, thereby taking out heat and grinding wheel chips.

[0005] Preferably, the bearing is locked by a bearing locking nut, and a bearing washer is arranged between the bearing and the bearing locking nut.

[0006] Preferably, the pore group includes radial pores and axial pores, and the radial pores are communicated with the axial pores.

[0007] Preferably, the pressure of the gas is set to 0.4-0.5 MPa.

[0008] Preferably, the skeleton oil seal contacts the shaft to form a contact sealing structure.

[0009] Working principle: The shaft and skeleton oil seal cooperate to form a contact seal. Due to the relative movement, a large amount of heat is generated. At this time, air is ventilated through the air nozzle of the front cover and blown to the end face of the skeleton oil seal through the radial air outlet holes evenly distributed on the inner ring, and discharged from the cooling channel at the shaft end, thereby taking away a large amount of heat and grinding wheel chips and reducing the temperature of the contact seal.

[0010] Compared with the traditional structure, the utility model has the following beneficial effects: the structure is simple, and it is easy to install and process. The cooling airflow blows toward the skeleton oil seal through the gas channel, which can effectively cool the sealing structure, extend the service life of the seal, has a good dustproof sealing effect, and improves the stability of the spindle operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] In the figure: 1. air nozzle, 2. front cover, 3. housing, 4. bearing, 5. shaft, 6. bearing gasket, 7. bearing locking nut, 8. skeleton oil seal, 9. front cover inner ring, 10. annular cavity, 11. air hole group. DETAILED DESCRIPTION

[0013] The utility model is further described below.

[0014] Refer to the attached Figure 1 A contact seal structure for a grinding machine spindle comprises a shaft 5, wherein the shaft 5 is connected to a housing 3 through a bearing 4, and is characterized in that: a front cover 2 is arranged on one side of the housing 3, a front cover inner ring 9 is arranged on one side of the front cover 2, a skeleton oil seal 8 is arranged in the front cover inner ring 9, an air nozzle 1 is arranged on the front cover 2, a gas channel is arranged in the front cover 2, an annular cavity 10 is arranged between the front cover inner ring 9 and the front cover 2, and a plurality of pore groups 11 are evenly arranged on the front cover inner ring 9, and the gas flows to the skeleton oil seal 8 through the air nozzle 1, the gas channel in the front cover 2, the annular cavity 10, and the pore group 11, and is discharged through the cooling channel between the shaft 5 and the front cover inner ring 9.

[0015] In this preferred embodiment, the bearing 4 is locked by a bearing locking nut 7 , and a bearing washer 6 is provided between the bearing 4 and the bearing locking nut 7 .

[0016] In this preferred embodiment, the pore group 11 includes radial pores and axial pores, and the radial pores are connected to the axial pores.

[0017] In this preferred embodiment, the skeleton oil seal 8 is in contact with the shaft 5 to form a contact sealing structure.

[0018] In this preferred embodiment, the pressure of the gas is set to 0.4-0.5Mpa.

[0019] In specific implementation, the utility model is based on the existing seal, and 0.4-0.5Mpa air is passed to the front cover 2 through the air nozzle 1. A circle of evenly distributed axial and radial air holes are processed in the inner ring 9 of the front cover. The cooling airflow blows to the skeleton oil seal 8, and the skeleton oil seal 8 contacts the shaft 5 to form a contact sealing structure. The airflow is discharged through the cooling channel between the shaft 5 and the inner ring 9 of the front cover, thereby taking out heat and grinding wheel chips. The cooling structure can effectively cool the skeleton sealing structure and extend the service life of the seal.

[0020] The above embodiments of the present invention are merely examples to clearly illustrate the present invention, but are not intended to limit the protection scope of the present invention. All equivalent technical solutions also belong to the scope of the present invention. The patent protection scope of the present invention should be defined by the claims.

Claims

1. A contact seal structure for a grinding machine spindle, comprising a shaft (5), wherein the shaft (5) is connected to a housing (3) via a bearing (4), and wherein: A front cover (2) is provided on one side of the housing (3), a front cover inner ring (9) is provided on one side of the front cover (2), a skeleton oil seal (8) is provided in the front cover inner ring (9), an air nozzle (1) is provided on the front cover (2), a gas channel is provided in the front cover (2), an annular cavity (10) is provided between the front cover inner ring (9) and the front cover (2), and a plurality of air hole groups (11) are evenly distributed on the front cover inner ring (9), and the gas flows to the skeleton oil seal (8) through the air nozzle (1), the gas channel in the front cover (2), the annular cavity (10), and the air hole group (11), and is discharged through the cooling channel between the shaft (5) and the front cover inner ring (9).

2. The contact seal structure for a grinding machine spindle according to claim 1, characterized in that: The bearing (4) is locked by a bearing locking nut (7), and a bearing washer (6) is provided between the bearing (4) and the bearing locking nut (7).

3. The contact seal structure for a grinding machine spindle according to claim 1, characterized in that: The pore group (11) comprises radial pores and axial pores, and the radial pores are connected to the axial pores.

4. The contact seal structure for a grinding machine spindle according to claim 1, characterized in that: The skeleton oil seal (8) is in contact with the shaft (5) to form a contact sealing structure.

5. The contact seal structure for a grinding machine spindle according to claim 1, characterized in that: The pressure of the gas is set to 0.4-0.5Mpa.

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