CN213744914U - Sealing structure of vertical machine tool spindle - Google Patents

Abstract

The utility model discloses a sealing structure of a vertical machine tool main shaft, which comprises a main shaft body, a main shaft shell outside the main shaft body and a bearing arranged between the main shaft body and the main shaft shell; an inner sealing ring is arranged above the bearing and on the periphery of the main shaft body, a gland is arranged on the periphery of the inner sealing ring, and a first labyrinth seal is formed between the gland and the main shaft body to block most of cooling liquid and debris outside to serve as a first seal; a gland sealing sleeve is arranged between the gland and the inner sealing ring, a first cavity is formed between the gland sealing sleeve and the gland, and cutting fluid and the like are prevented from entering the main shaft by using air pressure difference to serve as a second seal; a second labyrinth seal is formed among the gland, the gland sealing sleeve and the inner sealing ring and is communicated with a water flow channel on the gland, water in the spindle is discharged to be used as a third seal, and the sealing effect and the service life of the spindle of the machine tool are improved; and the outer diameter of the end part of the main shaft is reduced, the material is saved, the processing time is shortened, and the cost is saved.

Description

Sealing structure of vertical machine tool spindle

[ technical field ] A method for producing a semiconductor device

The utility model relates to a digit control machine tool technical field, concretely relates to seal structure of vertical lathe main shaft.

[ background of the invention ]

The spindle of a machine tool is a shaft on the machine tool for driving a workpiece or a tool to rotate, and generally comprises a spindle part, a bearing, a transmission part (a gear or a belt pulley), and the like. In the machine tool, the main part is used for supporting transmission parts such as gears and belt wheels and transmitting motion and torque, and the motion precision and the structural rigidity of a main shaft part are important factors for determining the processing quality and the cutting efficiency. The main shaft of the vertical machine tool in the market at present is special in structure, the size of the end part of the main shaft is often increased for sealing, and a sealing cover is additionally arranged, so that the waste of materials and labor cost is caused, the sealing effect of the sealing mode is poor, a gap exists, machining chips and suspended particles in air can enter through the gap, the main shaft, a bearing or other parts are abraded, and the service life and the machining performance of the machine tool are influenced; moreover, if the sealing is not good, cooling liquid can enter through the gap, so that lubricating grease on the bearing is easily diluted and even taken away, and the lubricating effect of the bearing is influenced.

[ Utility model ] content

In order to overcome the defect among the prior art, the utility model provides a seal structure of vertical lathe main shaft, seal structure has improved sealed effect, has reduced main shaft end portion external diameter size moreover, has reduced material and processing cost, has practiced thrift the resource.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a sealing structure of a vertical machine tool spindle comprises a spindle body and a spindle shell arranged on the periphery of the spindle body, wherein a bearing is arranged between the spindle body and the spindle shell; an inner sealing ring is fixedly arranged above the bearing and on the periphery of the main shaft body, a gland is arranged on the periphery of the inner sealing ring, a protrusion is arranged at the top of the gland, a groove is arranged below the main shaft body, and the protrusion on the gland and the groove of the main shaft are in clearance fit to form a first labyrinth seal to serve as a first seal of the main shaft of the machine tool; the inner side of the upper bulge of the gland is provided with an inner spigot, a gland sealing sleeve is arranged in the inner spigot, a first cavity is formed between the gland sealing sleeve and the gland, and a second labyrinth seal is formed among the gland, the gland sealing sleeve and the inner sealing ring.

Preferably, the gland is arranged above the main shaft shell, is connected with the main shaft shell through a bolt and is sealed by a sealing ring, so that water falling on the upper end surface of the main shaft shell is prevented from entering the main shaft.

Preferably, one side of the gland is provided with a gas channel communicated with the first cavity, the main shaft shell is provided with a gas inlet communicated with the gas channel, dry compressed air is introduced into the main shaft through the gas inlet on the main shaft shell, the air pressure in the main shaft is ensured to be always greater than the external air pressure, and a gas seal is formed and used as a second channel seal of the machine tool main shaft.

Preferably, a water flow channel is arranged on one side of the gland and is communicated with the second labyrinth seal to discharge a small amount of water in the main shaft.

Preferably, the inner sealing ring is pressed on the periphery of the main shaft body through a nut.

Preferably, the gland sealing sleeve is hot-mounted at the inner seam allowance of the gland.

Preferably, a second cavity is further arranged between the inner sealing ring and the gland, whether oil seals need to be placed or not can be determined according to the rotating speed, the oil seals are not placed when the rotating speed is high, the oil seals are placed when the rotating speed is low, and the sealing effect is further enhanced.

Compared with the prior art, the utility model discloses following beneficial effect has:

the sealing structure of the utility model blocks most of the cooling liquid and the scraps to form a first sealing through the labyrinth seal formed between the gland and the main shaft body; the air pressure in the main shaft is always larger than the external air pressure through a first cavity formed between the gland and the gland sealing sleeve, and cutting fluid, dust and the like are prevented from entering the main shaft by the air pressure difference to form a second seal; a small amount of water in the main shaft is discharged to form a third seal through a second labyrinth seal formed among the gland, the gland sealing sleeve and the inner sealing ring and a water flow channel on the gland, the utility model adopts a three-seal structure to seal the main shaft, thereby greatly improving the sealing effect and prolonging the service life of the main shaft of the machine tool; and the outer diameter of the end part of the main shaft is correspondingly reduced, so that the material is saved, the processing time is shortened, and the cost is saved.

[ description of the drawings ]

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of the sealing structure of the present invention;

wherein: 1-a main shaft body; 2-a spindle housing; 3-a bearing; 4-pressing the cover; 5-gland sealing sleeve; 6-inner sealing ring; 7-a first labyrinth seal; 8-a first chamber; 9-a second labyrinth seal; 10-a water flow channel; 11-a gas channel; 12-a second chamber; 13-an air inlet; 14-sealing ring.

[ detailed description ] embodiments

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, the utility model discloses a sealing structure of a vertical machine tool spindle, including a spindle body 1 and a spindle housing 2 arranged at the periphery of the spindle body 1, a bearing 3 is arranged between the spindle body 1 and the spindle housing 2, an inner sealing ring 6 is fixedly arranged above the bearing 3 and at the periphery of the spindle body 1, a gland 4 is arranged at the periphery of the inner sealing ring 6, a bulge is arranged at the top of the gland, a groove is arranged below a boss of the spindle body 1, and the bulge and the groove on the spindle are in clearance fit to form a first labyrinth seal 7 as a first seal of the machine tool spindle;

an inner spigot is further arranged on one side, close to the inner sealing ring 6, of the bulge on the gland 4, a gland sealing sleeve 5 is arranged in the inner spigot, a first cavity 8 is formed between the gland sealing sleeve 5 and the gland 4, a gas channel 11 communicated with the first cavity 8 is arranged on the side face of the gland 4, an air inlet 13 communicated with the gas channel 11 is formed in a flange of the spindle shell 2, dry compressed air is introduced into the spindle through the air inlet 13, the fact that the internal air pressure of the spindle is always larger than the external air pressure is guaranteed, and air sealing is formed and used as second sealing of the spindle of the machine tool;

a second labyrinth seal 9 is formed among the gland 4, the gland sealing sleeve 5 and the inner sealing ring 6, a water flow channel 10 is arranged on one side of the gland 4, which is far away from the gas channel 11, the water flow channel 10 is communicated with the second labyrinth seal 9, and a small amount of water in the spindle is discharged to be used as a third seal of the spindle of the machine tool.

Preferably, the inner seal ring 6 is pressed against the outer periphery of the main shaft body 1 above the bearing 3 by a nut.

Preferably, the gland 4 is disposed above the spindle housing 2, is connected to the spindle housing 2 by bolts, and is sealed by a seal ring 14 to prevent water falling on the upper end surface of the spindle housing 2 from entering the spindle.

Preferably, the gland sealing sleeve 5 is hot-fitted at the inner seam allowance of the gland.

Preferably, a second chamber 12 is arranged between the inner sealing ring 6 and the gland 4, whether an oil seal is placed or not can be determined according to the rotating speed, the oil seal is not placed when the rotating speed is high, and the oil seal is placed when the rotating speed is low, so that the sealing effect is further enhanced.

The above-mentioned embodiments only express a certain implementation manner of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.

Claims (7)

1. A sealing structure of a vertical machine tool spindle comprises a spindle body and a spindle shell arranged on the periphery of the spindle body, wherein a bearing is arranged between the spindle body and the spindle shell; the labyrinth seal is characterized in that an inner sealing ring is fixedly arranged above the bearing and on the periphery of the main shaft body, a gland is arranged on the periphery of the inner sealing ring, a protrusion is arranged at the top of the gland, a groove is arranged below the main shaft body, and the protrusion on the gland and the groove on the main shaft are in clearance fit to form a first labyrinth seal; a gland sealing sleeve is arranged between the gland and the inner sealing ring, a first cavity is formed between the gland sealing sleeve and the gland, and a second labyrinth seal is formed among the gland, the gland sealing sleeve and the inner sealing ring.

2. The seal structure according to claim 1, wherein the gland is provided above the main shaft housing, is bolted to the main shaft housing, and is sealed with a seal ring.

3. The seal structure of claim 1, wherein a gas passage is provided at one side of the gland in communication with the first chamber, and the spindle housing is provided with a gas inlet in communication with the gas passage.

4. The seal of claim 1, wherein a water flow passage is provided in the gland on a side thereof remote from the gas passage, the water flow passage communicating with the second labyrinth seal.

5. The seal structure of claim 1, wherein the inner seal ring is compressed against the periphery of the main shaft body by a nut.

6. A sealing arrangement according to claim 1, wherein the gland is thermally mounted between the gland and the inner seal ring.

7. The seal structure of claim 1, wherein a second chamber is further disposed between the inner seal ring and the gland.

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