Three-tile dynamic pressure direct drive main shaft

Abstract

The utility model belongs to the technical field of machine tool spindles, and particularly relates to a three-tile dynamic pressure direct drive spindle. The main shaft is rotatably arranged on the box body through a three-tile structure, two ends of the main shaft respectively extend out of the box body, one end of the main shaft is provided with a conical part, the motor comprises a rotor, a rotating shaft of the rotor is a hollow shaft with an inner hole, the inner hole comprises a cylindrical hole and a conical hole matched with the conical part on the main shaft, and a step surface is formed between the cylindrical hole and the conical hole. The conical part is inserted into the conical hole and is in threaded connection with the end face of the main shaft through an end face screw penetrating through a gasket, or a screw is arranged at the outer end of the conical part of the main shaft, the screw penetrates through the gasket and is in threaded connection with a locking nut to realize connection between the main shaft and the rotating shaft, and the gasket is limited between the step surface and the locking nut or the end face screw; a direct-drive structure is adopted, so that the main shaft does not shake, the center does not move, the grinding effect is good, the surface of a machined workpiece does not have lines, and the machining precision is high.

Description

Technical field:

[0001] The utility model belongs to the technical field of machine tool spindles, in particular to a three-piece bearing dynamic pressure direct-driven spindle. Background technology:

[0002] Most of the existing grinding machines use a belt transmission mechanism to drive the spindle to rotate. The belt transmission mechanism includes a slave pulley arranged at one end of the spindle and a main pulley arranged on the rotating shaft of the motor. The main pulley and the slave pulley are connected by a belt. The rotation of the motor shaft drives the main pulley to rotate, which in turn drives the slave pulley to rotate through the belt, and finally drives the spindle to rotate.

[0003] The belt of the belt drive mechanism will vibrate, causing the spindle to shake. In addition, the belt will pull the spindle toward the motor, causing unstable force on the spindle and even center movement, which will ultimately lead to poor grinding results and wrinkles on the surface of the processed workpiece. Summary of the invention:

[0004] The utility model aims to provide a three-piece bearing dynamic pressure direct-drive spindle which can stabilize the spindle force and improve the processing accuracy.

[0005] The utility model is achieved in this way:

[0006] A three-piece bearing dynamic pressure direct-drive spindle comprises a housing, a spindle and a motor, wherein the spindle is rotatably arranged on the housing through a three-piece bearing structure, and both ends of the spindle extend out of the housing respectively, and a tapered portion is arranged at one end of the spindle, and the motor comprises a rotor, and the rotating shaft of the rotor is a hollow shaft with an inner hole, and the inner hole comprises a cylindrical hole and a tapered hole matched with the tapered portion on the spindle, and a step surface is formed between the cylindrical hole and the tapered hole, and the tapered portion is inserted in the tapered hole and is screwed to the end face of the spindle through a gasket through an end screw, or a screw is arranged on the outer end of the tapered portion of the spindle, and the screw passes through a gasket and is screwed to a locking nut to realize the connection between the spindle and the rotating shaft, and the gasket is limited between the step surface and the locking nut or the end screw.

[0007] In the above-mentioned three-piece bearing dynamic pressure direct-drive spindle, the three-piece bearing structure includes arc bearings evenly distributed in the circumferential direction, a spindle mounting hole is arranged on the corresponding side plate on the box body, a positioning groove is arranged on the outer arc surface of the arc bearing, and screw mounting holes corresponding to the positioning grooves are arranged on the box body along the radial direction of the spindle mounting hole, and a positioning screw is threaded in the screw mounting hole, and one end of the positioning screw rests against the positioning groove.

[0008] In the above-mentioned three-piece bearing dynamic pressure direct-drive main shaft, a sealing plug is provided on the screw mounting hole directly connected to the outside at the outer end to isolate the positioning screw from the outside.

[0009] In the above-mentioned three-piece bearing dynamic pressure direct-drive main shaft, an oil seal is arranged between the main shaft mounting hole close to the motor and the main shaft.

[0010] In the above-mentioned three-piece bearing dynamic pressure direct-drive spindle, the motor also includes a stator and a motor housing. The motor housing includes a coaxially arranged base and a front cover. The base and the front cover are fixedly connected. The base and the front cover are mounted outside the stator, and a rear cover is arranged at the outer end of the base.

[0011] In the above-mentioned three-piece bearing dynamic pressure direct-drive main shaft, the front cover is connected to the flange, and the flange is fixed on the box body.

[0012] In the above-mentioned three-piece bearing dynamic pressure direct-drive spindle, the motor is a permanent magnet synchronous motor.

[0013] The outstanding advantages of the utility model compared with the prior art are:

[0014] The utility model adopts a direct drive structure, which can avoid the spindle vibration and unstable force caused by the belt drive in the prior art, so that the spindle remains stable and the center does not move. The grinding effect is good, the surface of the processed workpiece has no lines, and the processing accuracy is high. Description of the drawings:

[0015] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0016] Figure 2 It is a top view of the utility model;

[0017] Figure 3 yes Figure 2 AA section view;

[0018] Figure 4 yes Figure 3 A partial enlarged schematic diagram of

[0019] Figure 5 yes Figure 2 BB cross-sectional view;

[0020] Figure 6 yes Figure 4 A partial enlarged schematic diagram of

[0021] Figure 7 yes Figure 2 CC section view;

[0022] Figure 8 It is a schematic diagram of the motor of the utility model;

[0023] Fig. 9 It is an axial cross-sectional view of the motor of the utility model.

[0024] In the figure: 1. housing; 2. spindle; 3. motor; 4. grinding wheel; 5. tapered part; 6. rotor; 7. rotating shaft; 8. cylindrical hole; 9. tapered hole; 10. step surface; 11. gasket; 12. screw; 13. locking nut; 14. arc-shaped bushing; 15. spindle mounting hole; 16. screw mounting hole; 17. positioning screw; 18. sealing plug; 19. stator; 20. machine base; 21. front cover; 22. rear cover; 23. flange; 24. oil seal. Specific implementation method:

[0025] The present invention is further described below with specific embodiments:

[0026] like Figure 1-9 As shown, the utility model provides a three-piece bearing dynamic pressure direct-drive spindle, which includes a housing 1, a spindle 2, and a motor 3. The spindle 2 is rotatably arranged on the housing 1 through a three-piece bearing structure, and both ends of the spindle 2 extend out of the housing 1 respectively. One end of the spindle 2 is connected to the motor 3 and is directly driven to rotate by the motor 3. The other end of the spindle 2 is provided with a grinding wheel 4 which rotates synchronously with the spindle 2.

[0027] The utility model adopts a direct drive structure, which can avoid the vibration of the main shaft 2 and unstable force caused by the belt drive in the prior art, so that the main shaft 2 remains stable and the center does not move, the grinding effect is good, the surface of the processed workpiece has no lines, and the processing accuracy is high.

[0028] Specifically, if Figure 3 , Figure 4 , Figure 8 and Fig. 9 As shown, one end of the main shaft 2 of the utility model is provided with a tapered portion 5, the motor 3 includes a rotor 6, the rotating shaft 7 of the rotor 6 is a hollow shaft with an inner hole, the inner hole includes a cylindrical hole 8 and a tapered hole 9 adapted to the tapered portion 5 on the main shaft 2, a step surface 10 is formed between the cylindrical hole 8 and the tapered hole 9, the tapered portion 5 is inserted in the tapered hole 9 and is screwed to the end face of the main shaft 2 through a gasket 11 through an end screw or a screw 12 is provided on the outer end of the tapered portion 5 of the main shaft 2, the screw 12 passes through the gasket 11 and is screwed with a locking nut 13 to realize the connection between the main shaft 2 and the rotating shaft 7, and the gasket 11 is limited between the step surface 10 and the locking nut 13 or the end screw. Through the above-mentioned connection structure, the rotating shaft 7 of the motor 3 rotates, driving the main shaft 2 to rotate together, and the locking nut 13 or the end screw tightens the main shaft 2 and the rotating shaft 7 of the motor 3, so that the main shaft 2 and the rotating shaft 7 remain connected and rotate synchronously, which has the advantages of simple direct drive structure and convenient connection.

[0029] like Figure 3-Figure 7As shown, the three-piece tile structure includes arc-shaped tiles 14 uniformly distributed in the circumferential direction, spindle mounting holes 15 are respectively provided on the front and rear side plates of the box body 1, and positioning grooves are provided on the outer arc-shaped surface of the arc-shaped tiles 14. Screw mounting holes 16 corresponding to the positioning grooves are provided radially along the spindle mounting holes 15 on the box body 1. Positioning screws 17 are screwed into the screw mounting holes 16, and one end of the positioning screw 17 abuts against the positioning groove to limit the arc-shaped tiles 14 between the hole wall of the spindle mounting hole 15 and the outer cylindrical surface of the spindle 2, and the inner arc-shaped surface of the arc-shaped tiles 14 is in contact with the surface of the spindle 1. In this embodiment, the positioning screws 17 have a head abutting against the positioning groove, and also have a screw portion of the positioning screw abutting against the positioning groove.

[0030] An oil seal 24 is provided between the main shaft mounting hole 15 close to the motor 3 and the main shaft 2 .

[0031] Since there is a certain gap between the arc-shaped tile 14 of the three-tile structure and the hole wall of the main shaft mounting hole 15, the direct drive structure of the utility model can prevent the center of the main shaft 3 from moving under the pulling of the belt.

[0032] In order to prevent the liquid in the processing occasion from contacting the positioning screw 17 and corroding it, the utility model is provided with a sealing plug 18 on the screw mounting hole 16 directly connected to the outside world at the outer end to seal the positioning screw 17. In this way, each positioning screw 17 can be isolated from the outside world.

[0033] like Figure 3 , Figure 4 , Figure 8 and Fig. 9 As shown, the motor 3 also includes a stator 19 and a motor housing, and the motor housing includes a coaxially arranged base 20 and a front cover 21, the base 20 and the front cover 21 are fixedly connected by screws, the base 20 and the front cover 21 are sleeved outside the stator 19, and a rear cover 22 is arranged at the outer end of the base 20 for tight connection, and the rotor 6 and the stator 19 are arranged in a chamber surrounded by the front cover 21, the base 20, and the rear cover 22. The front cover 21 is connected to a flange 23, and the flange 23 is fixed on the box body 1.

[0034] It should be noted that the motor 3 of the present invention is a permanent magnet synchronous motor, and the four-tile structure should be equivalent to the three-tile structure of the present invention.

[0035] The above embodiment is only one of the preferred embodiments of the present utility model, and is not intended to limit the scope of implementation of the present utility model. Therefore, any equivalent changes made based on the shape, structure, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A three-piece bearing dynamic pressure direct-drive spindle, comprising a housing (1), a spindle (2), and a motor (3), wherein the spindle (2) is rotatably arranged on the housing (1) through a three-piece bearing structure, and is characterized in that: The two ends of the main shaft (2) extend out of the housing (1) respectively, and a conical portion (5) is provided at one end of the main shaft (2). The motor (3) comprises a rotor (6), and the rotating shaft (7) of the rotor (6) is a hollow shaft having an inner hole, wherein the inner hole comprises a cylindrical hole (8) and a conical hole (9) matched with the conical portion (5) on the main shaft (2), and a step surface (10) is formed between the cylindrical hole (8) and the conical hole (9). The conical portion (5) is inserted into the conical hole (9) and is screwed to the end face of the main shaft (2) or the outer end of the conical portion (5) of the main shaft (2) through an end face screw passing through a gasket (11). The screw (12) passes through the gasket (11) and is screwed to a locking nut (13) to achieve the connection between the main shaft (2) and the rotating shaft (7). The gasket (11) is limited between the step surface (10) and the locking nut (13) or the end face screw.

2. The three-piece bearing dynamic pressure direct-drive spindle according to claim 1, characterized in that: The three-piece tile structure comprises arc-shaped tiles (14) uniformly distributed in the circumferential direction, a main shaft mounting hole (15) is arranged on the corresponding side plate of the box body (1), a positioning groove is arranged on the outer arc-shaped surface of the arc-shaped tile (14), screw mounting holes (16) corresponding to the positioning groove are arranged on the box body (1) along the radial direction of the main shaft mounting hole (15), and a positioning screw (17) is screwed into the screw mounting hole (16), and one end of the positioning screw (17) is against the positioning groove.

3. The three-piece dynamic pressure direct-drive spindle according to claim 2, characterized in that: A sealing plug (18) is provided on the screw installation hole (16) whose outer end is directly connected to the outside world, so as to isolate the positioning screw (17) from the outside world.

4. A three-piece bearing dynamic pressure direct-drive spindle according to claim 2 or 3, characterized in that: An oil seal (24) is provided between the main shaft mounting hole (15) close to the motor (3) and the main shaft (2).

5. The three-piece dynamic pressure direct-drive spindle according to claim 1, characterized in that: The motor (3) further comprises a stator (19) and a motor housing, wherein the motor housing comprises a coaxially arranged machine base (20) and a front cover (21), wherein the machine base (20) and the front cover (21) are fixedly connected, the machine base (20) and the front cover (21) are sleeved outside the stator (19), and a rear cover (22) is arranged at the outer end of the machine base (20).

6. The three-piece dynamic pressure direct-drive spindle according to claim 5, characterized in that: The front cover (21) is connected to a flange (23), and the flange (23) is fixed on the box body (1).

7. The three-piece dynamic pressure direct-drive spindle according to claim 1, characterized in that: The motor (3) is a permanent magnet synchronous motor.

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