Spindle cooling structure capable of saving machine tool space to maximum extent

Abstract

The utility model belongs to the technical field of high-speed high-precision 3C industry numerical control machine tools, and discloses a main shaft cooling structure capable of saving machine tool space to the maximum extent. The main shaft cooling structure comprises a main shaft body, a front bearing seat is fixedly assembled at the end of the main shaft body, a steel cylinder is arranged at one end of the front bearing seat, and a cooling channel is arranged between the front bearing seat and the steel cylinder. A cooling channel on the front bearing seat is provided with deviation angles in the X direction and the Y direction, the cooling channel is arranged in the front bearing seat in a circling mode, and a cooling inlet and a cooling outlet are formed in the two ends of the cooling channel respectively. The bearing cooling effect is facilitated; the cooling channel in the front bearing seat has angular deviation in the X direction and the Y direction, the deviation is beneficial to the bearing cooling effect, interference of oil gas, an air seal and a screw through hole is avoided, the space occupied by the front end of the main shaft is greatly reduced, and client machine tool design and cost compression are facilitated.

Description

Technical Field

[0001] This utility model belongs to the field of CNC machine tool technology in the high-speed and high-precision 3C industry, and specifically relates to a spindle cooling structure that maximizes the saving of machine tool space. Background Technology

[0002] The electric spindle of a CNC machine tool is the core of CNC machine tool technology development. Electric spindles offer advantages such as compact structure, low vibration, low noise, high dynamic accuracy, and good stability. With the acceleration of my country's industrialization and the widespread adoption of CNC machine tools, social demand is increasing. This particular spindle achieves domestic production, replacing all previously purchased parts such as discs, bearings, and sensors with domestically sourced components. This saves costs while improving spindle performance and shortening delivery times, allowing for faster response to market demands.

[0003] Currently, existing spindles have internal cooling structures, which results in the spindle end face occupying a large space on the machine tool, which is not conducive to machine tool design and increases the processing difficulty during production, thus greatly increasing production costs. To address this, we propose a spindle cooling structure that maximizes space saving on the machine tool. Utility Model Content

[0004] The purpose of this invention is to provide a spindle cooling structure that maximizes space saving in machine tools, thereby solving the existing problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a spindle cooling structure that maximizes space saving in machine tools, comprising a spindle body, a front bearing housing, and a cooling channel. The front bearing housing is fixedly mounted at the end of the spindle body. A steel cylinder is provided at one end of the front bearing housing, and the steel cylinder is sleeved on the outside of the spindle body. An annular reciprocating cooling channel is provided between the front bearing housing and the steel cylinder. The cooling channel on the front bearing housing is provided with offset angles in both the X and Y directions. The end of the front bearing housing contracts through the offset angles provided on the cooling channel. The cooling channel is coiled inside the front bearing housing and has a cooling inlet and a cooling outlet at its two ends, respectively.

[0006] Preferably, a rotor assembly is installed inside the main shaft body, a tie rod is installed at one end of the rotor assembly, and inner holes are provided at both ends and the middle of the rotor assembly. The outer circle of the tie rod is tightly fitted with the inner hole of the rotor assembly to form a support point.

[0007] Preferably, a slider is provided at the inner middle of the rotor assembly, and the slider and the pull rod cooperate to form another support point.

[0008] Preferably, a tie rod sleeve is fitted at one end of the tie rod near the front bearing housing, and the outer circle and inner hole of the tie rod sleeve cooperate with the rotor assembly and the tie rod to form a third support point.

[0009] Preferably, both ends of the air seal structure on the main shaft body are provided with air storage grooves, and a side hole is opened on the outer side of the front bearing seat, which communicates with the air storage groove near the end face.

[0010] Preferably, both the cooling inlet and the cooling outlet are located at the tail end face of the main spindle body. A cylinder liner is provided at the end of the steel cylinder away from the front bearing seat. The cylinder liner is fitted around the outer periphery of the main spindle body. The cooling inlet extends directly to the steel cylinder through the cover plate, the cylinder liner, and the back cover.

[0011] Preferably, cooling pores are provided between the reciprocating paths of the cooling channel.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. By providing an annular reciprocating cooling channel between the steel cylinder and the front bearing housing, the cooling channel angle is the same in each reciprocating cycle, which is beneficial to the bearing cooling effect; the cooling channel in the front bearing housing has an angular offset in both the X and Y directions. This offset is beneficial to the bearing cooling effect and avoids the interference of oil and gas, air seals, and screw holes, which greatly reduces the space occupied by the front end of the spindle, which is beneficial to the design of the machine tool and cost reduction.

[0014] 2. By utilizing the rotor assembly, along with its internal holes at both ends and in the middle, as well as the tie rod, slider, and tie rod sleeve, three similarly uniform support points are ensured inside the rotor. This reduces the impact of the tie rod, which continuously vibrates under centrifugal force during the high-speed rotation of the main spindle, on the vibration of the main spindle. At the same time, the rotor assembly only requires precision grinding at three locations of the internal holes during machining, greatly reducing the difficulty of machining and facilitating large-scale production. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the cross-sectional structure of the main shaft of this utility model;

[0016] Figure 2 This is a schematic diagram of the cooling channel structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the steel cylinder structure of this utility model;

[0019] Figure 5 This is a schematic diagram of the front bearing housing structure of this utility model.

[0020] In the diagram: 1. Main spindle body; 2. Front bearing housing; 3. Cooling inlet; 4. Cooling outlet; 5. Offset angle; 6. Cooling hole; 7. Air reservoir; 8. Side hole; 9. Rotor assembly; 10. Tie rod; 11. Inner hole; 12. Slider; 13. Tie rod sleeve; 14. Steel cylinder; 15. Cylinder liner; 16. Cooling channel. Detailed Implementation

[0021] 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.

[0022] Please see Figure 1-5 This utility model provides a spindle cooling structure technical solution that maximizes the saving of machine tool space: it includes a spindle body 1, a front bearing seat 2, and a cooling channel 16. The front bearing seat 2 is fixedly mounted on the end of the spindle body 1. A steel cylinder 14 is provided at one end of the front bearing seat 2. The steel cylinder 14 is sleeved on the outside of the spindle body 1. An annular reciprocating cooling channel 16 is provided between the front bearing seat 2 and the steel cylinder 14. The cooling channel 16 on the front bearing seat 2 is provided with an offset angle 5 in both the X and Y directions. The end of the front bearing seat 2 is contracted by the offset angle 5 provided on the cooling channel 16. The cooling channel 16 is coiled inside the front bearing seat 2 and has a cooling inlet 3 and a cooling outlet 4 at its two ends, respectively.

[0023] Specifically, the spindle body 1 is equipped with a rotor assembly 9 inside, and a tie rod 10 is installed at one end of the rotor assembly 9. The rotor assembly 9 has inner holes 11 at both ends and in the middle. The outer circle of the tie rod 10 fits tightly with the inner hole 11 of the rotor assembly 9 to form a support point.

[0024] Specifically, a slider 12 is provided at the middle of the rotor assembly 9. The slider 12 and the inner hole 11 at the middle of the rotor assembly 9 cooperate with the pull rod 10 to form another support point.

[0025] Specifically, a tie rod sleeve 13 is fitted at one end of the tie rod 10 near the front bearing housing 2. The outer circle and inner hole 11 of the tie rod sleeve 13 cooperate with the rotor assembly 9 and the tie rod 10 to form a third support point.

[0026] Specifically, the main body 1 has an air seal structure with air storage grooves 7 at both ends, and the front bearing seat 2 has a side hole 8 on the outer side, which is connected to the air storage groove 7 near the end face.

[0027] Specifically, the cooling inlet 3 and the cooling outlet 4 are both located on the tail end face of the main spindle body 1. The end of the steel cylinder 14 away from the front bearing seat 2 is provided with a cylinder liner 15. The cylinder liner 15 is fitted on the outer periphery of the main spindle body 1. The cooling inlet 3 reaches the steel cylinder 14 directly through the cover plate, the cylinder liner 15, and the back cover.

[0028] Specifically, cooling holes 6 are provided between the reciprocating paths of the cooling channel 16.

[0029] In this embodiment, a cooling channel 16 is provided inside the spindle body 1, with its cooling inlet 3 and cooling outlet 4 located at the tail end face of the spindle body 1. The cooling inlet 3 passes through the cover plate, cylinder liner 15, and back cover directly to the steel cylinder 14. A reciprocating annular cooling channel 16 is provided between the steel cylinder 14 and the front bearing housing 2, and the offset angle 5 of the cooling channel 16 is offset by the same angle in each reciprocating cycle. Similarly, the cooling channel 16 in the front bearing housing 2 is offset in both the X and Y directions. The use of an offset angle 5 is beneficial to improving the bearing cooling effect, while avoiding interference from oil and gas, air seals, and screw holes. This greatly reduces the space occupied by the front end of the spindle and is beneficial to the design and cost reduction of the machine tool. The spindle body 1 is designed to be used as a vertical machine tool by opening a side hole 8 on the side of the air storage groove 7 near the end face of the spindle body 1. When the side hole 8 is blocked, the spindle body 1 can be used as a horizontal machine tool. After removing the screw in the side hole 8, the spindle body 1 can be used as a horizontal machine tool. By using the rotor assembly 9, in conjunction with the inner holes 11 at both ends and in the middle, as well as the tie rod 10, slider 12 and tie rod sleeve 13, it is ensured that there are three similarly uniform support points inside the rotor. This reduces the impact of the tie rod 10, which is constantly oscillating under centrifugal force when the spindle body 1 is running at high speed, on the vibration of the spindle body 1. At the same time, the rotor assembly 9 only needs to be finely ground at the three positions of the inner hole 11 during machining, which greatly reduces the machining difficulty and is conducive to large-scale machining production.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A spindle cooling structure that maximizes space saving in machine tools, comprising a spindle body (1), a front bearing housing (2), and a cooling channel (16), characterized in that: The front bearing housing (2) is fixedly mounted on the end of the main shaft body (1). A steel cylinder (14) is provided at one end of the front bearing housing (2). The steel cylinder (14) is sleeved on the outside of the main shaft body (1). An annular reciprocating cooling channel (16) is provided between the front bearing housing (2) and the steel cylinder (14). The cooling channel (16) on the front bearing housing (2) is provided with an offset angle (5) in both the X and Y directions. The end of the front bearing housing (2) is contracted by the offset angle (5) provided on the cooling channel (16). The cooling channel (16) is coiled inside the front bearing housing (2) and has a cooling inlet (3) and a cooling outlet (4) respectively at both ends.

2. The spindle cooling structure for maximizing machine tool space saving according to claim 1, characterized in that: The main shaft body (1) is equipped with a rotor assembly (9). A pull rod (10) is installed at one end of the rotor assembly (9). The rotor assembly (9) has inner holes (11) at both ends and in the middle. The outer circle of the pull rod (10) is tightly fitted with the inner hole (11) of the rotor assembly (9) to form a support point.

3. The spindle cooling structure for maximizing machine tool space saving according to claim 2, characterized in that: A slider (12) is provided at the middle of the rotor assembly (9). The slider (12) and the inner hole (11) at the middle of the rotor assembly (9) cooperate with the pull rod (10) to form another support point.

4. The spindle cooling structure for maximizing machine tool space saving according to claim 2, characterized in that: The end of the pull rod (10) near the front bearing seat (2) is fitted with a pull rod sleeve (13), and the outer circle and inner hole (11) of the pull rod sleeve (13) cooperate with the rotor assembly (9) and the pull rod (10) to form a third support point.

5. The spindle cooling structure for maximizing machine tool space saving according to claim 1, characterized in that: The main shaft body (1) has an air seal structure with air storage grooves (7) at both ends. The front bearing seat (2) has a side hole (8) on its outer side, which is connected to the air storage groove (7) near the end face.

6. The spindle cooling structure for maximizing machine tool space saving according to claim 1, characterized in that: The cooling inlet (3) and cooling outlet (4) are both located on the tail end face of the main shaft body (1). A cylinder liner (15) is provided at the end of the steel cylinder (14) away from the front bearing seat (2). The cylinder liner (15) is fitted on the outer periphery of the main shaft body (1). The cooling inlet (3) reaches the steel cylinder (14) through the cover plate, cylinder liner (15), and back cover.

7. The spindle cooling structure for maximizing machine tool space saving according to claim 1, characterized in that: Cooling holes (6) are provided between the reciprocating paths of the cooling channel (16).

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