Spindle cooling structure and cooling spindle

Abstract

A main shaft cooling structure belongs to electric main shaft technical field, including shaft core, first bearing, first bearing seat, second bearing and second bearing seat, first bearing seat is installed on the upper portion of shaft core, second bearing seat is installed on the bottom of shaft core, shaft core is rotatably installed on first bearing seat through first bearing, shaft core is rotatably installed on second bearing seat through second bearing, first bearing seat is equipped with first cooling circuit, and second bearing seat is equipped with second cooling circuit.The utility model has the advantages that through the internal cooling circuit of first bearing seat and second bearing seat, the bearing of each place of shaft core is cooled in limited installation space, ensures that bearing works stably when main shaft high -speed operation, improves the adaptability of main shaft in high -strength processing.

Description

Technical Field

[0001] This utility model relates to the field of electric spindle technology, and in particular to a spindle cooling structure and a cooling spindle. Background Technology

[0002] Traditional machine tool operations commonly use mechanical spindles. Mechanical spindles employ external motors, resulting in low speeds, large rear-end structures, and high starting loads, making them unsuitable for high-precision machining requirements. With the development of the CNC industry, electric spindle technology has become increasingly widespread. Electric spindles integrate the motor, with the rotor directly engaging the spindle core for rotation. This allows for high-speed cutting while maintaining material machining accuracy.

[0003] In existing electric spindle technology, due to installation size limitations, only a portion of the spindle structure can be cooled. Under high-speed motion, the bearings heat up and shift, resulting in phenomena such as low operating speed, bearing burnout and jamming at high speeds, and low static stiffness of the spindle core, which affect the product processing quality. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this utility model provides a spindle cooling structure and a cooling spindle, the technical solution of which is as follows: A spindle cooling structure includes a spindle core, a first bearing, a first bearing housing, a second bearing, and a second bearing housing. The first bearing housing is mounted on the upper part of the spindle core, and the second bearing housing is mounted on the bottom of the spindle core. The spindle core is rotatably mounted on the first bearing housing via the first bearing, and the spindle core is rotatably mounted on the second bearing housing via the second bearing. The first bearing housing is provided with a first cooling circuit, and the second bearing housing is provided with a second cooling circuit.

[0005] Furthermore, the spindle cooling structure also includes a first partition assembly, and there are multiple first bearings. The first partition assembly separates the multiple first bearings and presses the multiple first bearings together.

[0006] Furthermore, the spindle cooling structure also includes a second partition assembly and an air seal cover assembly. There are multiple second bearings. The second partition assembly separates the multiple second bearings and presses the multiple second bearings together.

[0007] Furthermore, the first cooling circuit is stepped and surrounds the first bearing, while the second cooling circuit is spiral and surrounds the second bearing.

[0008] Furthermore, the spindle cooling structure also includes a cooling sleeve that wraps around the second bearing housing and is located at the corresponding position of the second cooling circuit.

[0009] Furthermore, the spindle cooling structure also includes a hydraulic cylinder assembly. The spindle core is provided with a pull rod, a gripper, and a tapered shank. One end of the pull rod is fixedly connected to the output end of the hydraulic cylinder assembly, and the other end of the pull rod is elastically connected to the gripper. The gripper cooperates with the tapered shank to allow the gripper to selectively clamp the tapered shank.

[0010] Furthermore, the shaft core is also provided with a positioning ring and a sealing ring. The positioning ring is installed on the pull rod, and the sealing ring cooperates with the positioning ring to form a seal.

[0011] Furthermore, the cylinder assembly has a hollow structure, and a water outlet rod is connected inside the cylinder assembly. The pull rod has a hollow inner diameter, and the water outlet rod is connected to the pull rod.

[0012] Furthermore, the spindle cooling structure includes a monitoring component, which includes an encoder disk and an encoder. The encoder disk and the encoder are mounted above the spindle core and monitor the spindle operation.

[0013] A cooling spindle includes a sleeve, a motor, and any one of the spindle cooling structures described above. The motor is housed inside the sleeve and is drivenly connected to the spindle core. A first bearing seat and a second bearing seat are fixedly connected to the sleeve. A coolant inlet is provided on the outer wall of the sleeve and is connected to the first cooling circuit.

[0014] The advantage of this invention is that, through the internal cooling circuits of the first and second bearing housings, the bearings at various points on the spindle core are cooled within a limited installation space, ensuring stable operation of the bearings when the spindle is running at high speed and improving the spindle's adaptability to high-intensity machining. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the spindle cooling structure of this utility model; Figure 2 This is an enlarged cross-sectional view of the spindle cooling structure.

[0016] In the picture: 1. Shaft core; 11. Tie rod; 12. Gripper; 13. Tapered shank; 14. Water outlet rod; 15. Cylinder assembly; 16. Positioning ring; 17. Sealing ring; 2. First bearing housing; 21. First cooling circuit; 3. First bearing; 4. First partition assembly; 5. Balance ring; 6. Second bearing housing; 61. Second cooling circuit; 7. Second bearing; 8. Second partition assembly; 9. Air seal cover assembly; 10. Monitoring assembly; 101. Encoder disk; 102. Encoder; 110. Sleeve; 1101. Coolant inlet; 120. Cooling jacket. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / as well" as used herein includes any and all combinations of one or more of the associated listed items.

[0019] The following describes the embodiments in conjunction with the appendix. Figure 1-2 This utility model will be described in further detail.

[0020] A spindle cooling structure includes a spindle core 1, a first bearing housing 2, a first bearing 3, a first partition assembly 4, a balance ring 5, a second bearing housing 6, a second bearing 7, a second partition assembly 8, an air seal cover assembly 9; a monitoring assembly 10, a sleeve 110, and a cooling sleeve 120.

[0021] The shaft core 1 is internally equipped with a pull rod 11, a gripper 12, a tapered shank 13, a positioning ring 16, and a sealing ring 17. The upper end of the pull rod 11 is connected to a cylinder assembly 15, and the output end of the cylinder assembly 15 is fixedly connected to the pull rod 11. The pull rod 11 and the gripper 12 are elastically connected. The expansion and contraction of the gripper 12 can release or grip the tapered shank 13. The cylinder assembly 15 and the pull rod 11 are hollow structures. The cylinder assembly 15 is internally connected to a water outlet rod 14. The pull rod 11 has a hollow inner diameter and is connected to the water outlet rod 14. Water from the water outlet rod 14 flows through the pull rod 11 to the tapered shank 13 to cool the cutting tool.

[0022] The first bearing housing 2 is provided with a first cooling circuit 21. Specifically, in this embodiment, the first cooling circuit 21 is stepped and surrounds the first bearing housing 2.

[0023] The second bearing housing 6 is provided with a second cooling circuit 61. Specifically, in this embodiment, the second cooling circuit 61 is spirally arranged and surrounds the second bearing housing 6.

[0024] The lubrication method for the first bearing 3 and the second bearing 7 is oil-air lubrication.

[0025] The monitoring component 100 includes an encoder disk 101 and an encoder 102. The cooling jacket 120 is made of a material with good thermal conductivity.

[0026] Connection relationship of a spindle cooling structure: The shaft core 1 is rotatably mounted on the first bearing seat 2 and the second bearing seat 6 via the first bearing 3 and the second bearing 7. The first cooling circuit 21 is arranged around the first bearing 3, and the second cooling circuit 61 is arranged around the second bearing 7. In this embodiment, there are multiple first bearings 3 and second bearings 7. The multiple first bearings 3 are arranged at intervals by the first partition component 4. The first partition component 4 on both sides of the multiple first bearings 3 presses the multiple first bearings 3 together to provide sufficient support force. The multiple second bearings 7 are arranged at intervals by the second partition component 8. The air seal cover component 9 covers the multiple second bearings 7 to press them together. The cooling wall 120 surrounds and fits against the outer wall of the second bearing seat 6. The cooling wall 120 corresponds to the position of the second cooling circuit 61. The encoder disk 101 and the encoder 102 are mounted above the shaft chip.

[0027] The working process of a spindle cooling structure: The cylinder assembly 15 extends the pull rod 11, causing the gripper 12 to grasp the taper shank 13 to install the tool. The shaft core 1 begins to rotate at high speed, driving the tool to perform machining operations. The first cooling circuit 21 and the second cooling circuit 61 circulate coolant to remove the heat dissipated by the bearing during operation. Water flows from the water outlet rod 14 through the pull rod 11 to the taper shank 13 to cool the tool. After machining is completed, the shaft core 1 stops rotating, the cylinder assembly 15 returns oil to restore the pull rod 11, and the gripper 12 releases the taper shank 13 under the action of elasticity to replace the tool.

[0028] A cooling spindle includes a sleeve 110, a motor, and a spindle cooling mechanism. A first bearing seat 2 and a second bearing seat 6 are fixedly connected to the sleeve 110. The sleeve 110 is equipped with a motor, which is connected to the shaft core 1 for transmission. The outer wall of the sleeve 110 is provided with a coolant inlet 1101, which is connected to a first cooling circuit 21.

[0029] A process for cooling a spindle: The cylinder assembly 15 extends the pull rod 11, causing the gripper 12 to grasp the taper shank 13 to install the tool. The motor starts, driving the spindle core 1 to rotate at high speed, allowing the tool to perform machining operations. Coolant enters the first cooling circuit 21 from the coolant inlet 1101 and flows out from the outlet of the first cooling circuit 21. Coolant flows through the inlet and outlet of the second cooling circuit 61, allowing the coolant to carry away the heat dissipated by the bearings at various parts of the spindle. Water flows out of the water outlet rod 14 through the pull rod 11 to the taper shank 13 to cool the tool. After machining is completed, the spindle core 1 stops rotating, the cylinder assembly 15 returns oil, causing the pull rod 11 to return to its original position, and the gripper 12 releases the taper shank 13 under the action of elasticity, allowing the tool to be replaced.

[0030] The advantage of this utility model is that, through the internal cooling circuits of the first bearing housing 2 and the second bearing housing 6, the bearings at various points of the spindle core 1 are cooled within a limited installation space, ensuring stable operation of the bearings when the spindle is running at high speed and improving the spindle's adaptability to high-intensity machining.

[0031] The above embodiments only illustrate one implementation of the present utility model, and should not be construed as limiting the scope of the utility model patent. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present utility model. These are all equivalent modifications and improvements made to the above embodiments based on the essential technology of the present utility model, and all of these fall within the protection scope of the present utility model.

Claims

1. A spindle cooling structure, comprising a spindle core, characterized in that: It also includes a first bearing, a first bearing housing, a second bearing, and a second bearing housing. The first bearing housing is installed on the upper part of the shaft core, and the second bearing housing is installed on the bottom of the shaft core. The shaft core is rotatably mounted on the first bearing housing via the first bearing, and the shaft core is rotatably mounted on the second bearing housing via the second bearing. The first bearing housing is provided with a first cooling circuit, and the second bearing housing is provided with a second cooling circuit.

2. The spindle cooling structure according to claim 1, characterized in that: The spindle cooling structure further includes a first partition component, and there are multiple first bearings. The first partition component separates the multiple first bearings and presses the multiple first bearings together.

3. The spindle cooling structure according to claim 2, characterized in that: The spindle cooling structure also includes a second partition assembly and an air seal cover assembly. There are multiple second bearings. The second partition assembly separates the multiple second bearings and presses the multiple second bearings together.

4. The spindle cooling structure according to claim 3, characterized in that: The first cooling circuit is stepped and surrounds the first bearing. The second cooling circuit is spiral and surrounds the second bearing.

5. The spindle cooling structure according to claim 4, characterized in that: The spindle cooling structure also includes a cooling sleeve that wraps around the second bearing housing and is located at the corresponding position of the second cooling circuit.

6. The spindle cooling structure according to claim 1, characterized in that: The spindle cooling structure also includes a hydraulic cylinder assembly. The spindle core is equipped with a pull rod, a gripper, and a tapered shank. One end of the pull rod is fixedly connected to the output end of the hydraulic cylinder assembly, and the other end of the pull rod is elastically connected to the gripper. The gripper cooperates with the tapered shank to selectively clamp the tapered shank.

7. The spindle cooling structure according to claim 6, characterized in that: The shaft core is also provided with a positioning ring and a sealing ring. The positioning ring is installed on the pull rod, and the sealing ring cooperates with the positioning ring to form a seal.

8. The spindle cooling structure according to claim 6, characterized in that: The hydraulic cylinder assembly has a hollow structure, and a water outlet rod is connected inside the hydraulic cylinder assembly. The pull rod has a hollow inner diameter, and the water outlet rod is connected to the pull rod.

9. The spindle cooling structure according to claim 1, characterized in that: The spindle cooling structure includes a monitoring component, which includes an encoder disk and an encoder. The encoder disk and the encoder are mounted above the spindle core and monitor the spindle operation.

10. A cooling spindle, characterized in that: The device includes a sleeve, a motor, and the spindle cooling structure according to any one of claims 1-9. The sleeve contains a motor that is connected to the shaft core. The first bearing seat and the second bearing seat are fixedly connected to the sleeve. The outer wall of the sleeve has a coolant inlet that is connected to the first cooling circuit.

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