Fixing device for rotating joint of main shaft of numerical control machine tool

Abstract

The utility model provides a numerical control machine tool main shaft rotating joint fixing device which comprises a fixing sleeve corresponding to a rotating joint and a cutter loosening oil cylinder piston, a limiting ring is arranged in the fixing sleeve, a damping buffer structure is arranged between the limiting ring and the fixing sleeve, the rotating joint comprises a shell and an inner core, a first bearing is arranged between the shell and the inner core, and a second bearing is arranged between the shell and the inner core. A second bearing is arranged between the inner core and the limiting ring, and a fixed connecting structure is arranged between the fixing sleeve and the shell. According to the utility model, by installing the fixing sleeve, the center of the rotating joint can be fixed and adjusted through the fixing sleeve, so that the main shaft can be prevented from driving the shell to vibrate when rotating at a high speed, the stability of the shell is ensured, and the service life of the rotating joint is prolonged; and good damping and limiting effects can be achieved, the first bearing is prevented from being damaged by lateral force, and the service life of the first bearing is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary joint fixing, in particular to a fixing device for a rotary joint of a CNC machine tool spindle. Background Technique

[0002] The spindle of a CNC machine tool has multiple functions. One of the functions is to provide cutting fluid and blow air for cleaning the tool holder from the center of the spindle to the center of the tool in front. Therefore, a rotary joint is provided at the back of the spindle. The inner core of the rotary joint rotates with the spindle, while the outer shell of the rotary joint connected to the liquid supply and gas supply pipes cannot rotate. Since the inner core of the rotary joint rotates at a high speed with the spindle, although bearings are installed in front of the rotary joint to reduce the shaking of the rotary joint. However, there are still problems of clearance and wear in the bearings, resulting in still some runout and vibration of the rotary joint, affecting the stability of the rotary joint, and the lateral pressure of the spindle will also damage the bearings, affecting the service life of the bearings.

[0003] Therefore, the utility model provides a fixing device for a rotary joint of a CNC machine tool spindle. Content of the Utility Model

[0004] Aiming at the deficiencies existing in the prior art, the purpose of the utility model is to provide a fixing device for a rotary joint of a CNC machine tool spindle to solve the problems put forward in the above background technique. The utility model can prevent the outer shell from vibrating when the spindle rotates at a high speed, ensure the stability of the outer shell, and extend the service life of the rotary joint; it can also achieve a good shock absorption and limiting effect, prevent the lateral force from damaging the first bearing, and extend the service life of the first bearing.

[0005] In order to achieve the above purpose, the utility model is realized through the following technical solutions: A fixing device for a rotary joint of a CNC machine tool spindle includes a fixing sleeve corresponding to the rotary joint and the piston of the tool release cylinder. A limiting ring is installed in the fixing sleeve, and a shock absorption and buffering structure is installed between the limiting ring and the fixing sleeve. The rotary joint includes an outer shell and an inner core. A first bearing is installed between the outer shell and the inner core, a second bearing is installed between the inner core and the limiting ring, and a fixed connection structure is installed between the fixing sleeve and the outer shell.

[0006] Further, the fixing sleeve is fixed to the tail of the piston of the tool release cylinder by bolts.

[0007] Further, the fixed connection structure includes a plurality of screws, and the screws are in threaded cooperation with the fixing sleeve.

[0008] Further, a plurality of grooves are formed on the circumferential side of the outer shell, the grooves correspond to the screws, and the bottom of the grooves is a flat structure.

[0009] Further, the shock absorption and buffering structure includes a plurality of buffer rods, and a connecting plate is installed at one end of the buffer rods, and the connecting plate is fixedly connected to the limiting ring.

[0010] Further, the inside of the connecting plate is of a honeycomb structure, and the connecting plate is fixedly connected to the limiting ring.

[0011] Further, the buffer rod includes a first rod body and a second rod body, and the first rod body is slidably connected to the second rod body.

[0012] Further, a rubber block is fixed between the first rod body and the second rod body.

[0013] The beneficial effects of the present utility model: The fixing device for the rotating joint of the main shaft of the numerical control machine tool of the present utility model includes a fixing sleeve; a rotating joint; a housing; a limiting ring; a shock absorption and buffering structure; a first bearing.

[0014] By installing the fixing sleeve, the center of the rotating joint can be fixed and adjusted through the fixing sleeve, thereby preventing the housing from vibrating when the main shaft rotates at a high speed, ensuring the stability of the housing, extending the service life of the rotating joint. Installing a shock absorption and buffering structure between the limiting ring and the fixing sleeve can achieve better shock absorption and limiting effects, preventing lateral forces from damaging the first bearing and extending the service life of the first bearing. Description of the Drawings

[0015] Figure 1 is the assembly three-dimensional structure diagram of the fixing device for the rotating joint of the main shaft of the numerical control machine tool of the present utility model and the rotating joint;

[0016] Figure 2 is the exploded view of the fixing device for the rotating joint of the main shaft of the numerical control machine tool of the present utility model and the rotating joint;

[0017] Figure 3 is the assembly three-dimensional structure diagram of the whole fixing device for the rotating joint of the main shaft of the numerical control machine tool of the present utility model;

[0018] Figure 4 is the assembly sectional structure diagram of the whole fixing device for the rotating joint of the main shaft of the numerical control machine tool of the present utility model;

[0019] Figure 5 is Figure 4 the schematic diagram at A in

[0020] In the figure: 1, rotating joint; 2, housing; 3, inner core; 4, first bearing; 5, second bearing; 7, fixing sleeve; 8, groove; 9, screw; 10, buffer rod; 11, first rod body; 12, second rod body; 13, rubber block; 14, connecting plate; 15, limiting ring. Detailed Embodiments

[0021] In order to make the technical means, creative features, achieved purposes and effects of the present utility model easy to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0022] Please refer to Figures 1 to 5 . The present utility model provides a technical solution: a fixing device for a rotating joint of a numerical control machine tool spindle, which includes a fixing sleeve 7 corresponding to the rotating joint 1 and the piston of the tool releasing cylinder. A limiting ring 15 is installed inside the fixing sleeve 7, and a shock absorption and buffering structure is installed between the limiting ring 15 and the fixing sleeve 7. The rotating joint 1 includes a housing 2 and an inner core 3. A first bearing 4 is installed between the housing 2 and the inner core 3, and a second bearing 5 is installed between the inner core 3 and the limiting ring 15. A fixed connection structure is installed between the fixing sleeve 7 and the housing 2.

[0023] In this embodiment, the fixing sleeve 7 is fixed to the tail of the piston of the tool releasing cylinder by bolts. The fixed connection structure includes a plurality of screws 9. The screws 9 are in threaded cooperation with the fixing sleeve 7. A plurality of grooves 8 are formed on the circumferential side of the housing 2. The grooves 8 correspond to the screws 9, and the bottom of the grooves 8 is a flat structure.

[0024] Specifically, the fixing sleeve 7 can be fixedly connected to the tail of the piston of the tool releasing cylinder, and then the housing 2 is inserted into the fixing sleeve 7. The screw 9 is rotated so that the screw 9 enters the groove 8, and the housing 2 is clamped by a plurality of screws 9, so that the housing 2 can be fixed and the stability of the housing 2 can be ensured.

[0025] The shock absorption and buffering structure includes a plurality of buffer rods 10. One end of the buffer rod 10 is provided with a connecting plate 14, and the connecting plate 14 is fixedly connected to the limiting ring 15; the inside of the connecting plate 14 is a honeycomb structure, and the connecting plate 14 is fixedly connected to the limiting ring 15. The buffer rod 10 includes a first rod body 11 and a second rod body 12. The first rod body 11 is slidably connected to the second rod body 12, and a rubber block 13 is fixed between the first rod body 11 and the second rod body 12.

[0026] Specifically, the inner core 3 passes through the second bearing 5 and is connected to the spindle. When the spindle vibrates, the spindle will drive the inner core 3 to squeeze the second bearing 5. At this time, the limiting ring 15 can limit the second bearing 5 to prevent a large lateral force from being directly applied to the first bearing 4, and the honeycomb structure can absorb a part of the energy, thereby achieving a certain shock absorption effect. The limiting ring 15 will also squeeze the second rod body 12, so that the second rod body 12 squeezes the first rod body 11 to further reduce the vibration, so that the inner core 3 can be shock-absorbed and the service life of the rotating joint 1 can be extended.

[0027] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only includes an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A CNC machine tool spindle rotary joint fixing device, comprising a fixing sleeve (7) corresponding to the rotary joint (1) and the tool release cylinder piston, characterized in that: A limiting ring (15) is installed in the fixing sleeve (7), a shock absorbing and buffering structure is installed between the limiting ring (15) and the fixing sleeve (7), the rotary joint (1) comprises an outer shell (2) and an inner core (3), a first bearing (4) is installed between the outer shell (2) and the inner core (3), a second bearing (5) is installed between the inner core (3) and the limiting ring (15), and a fixed connection structure is installed between the fixing sleeve (7) and the outer shell (2).

2. The CNC machine tool spindle rotary joint fixing device according to claim 1 is characterized in that: The fixing sleeve (7) is fixed to the tail of the knife loosening oil cylinder piston by means of bolts.

3. The CNC machine tool spindle rotary joint fixing device according to claim 1 is characterized in that: The fixed connection structure comprises a plurality of screws (9), and the screws (9) are threadably matched with the fixing sleeve (7).

4. The CNC machine tool spindle rotary joint fixing device according to claim 3 is characterized in that: A plurality of grooves (8) are provided on the peripheral side of the housing (2), the grooves (8) correspond to the screws (9), and the bottom of the grooves (8) is a plane structure.

5. The CNC machine tool spindle rotary joint fixing device according to claim 1, characterized in that: The shock-absorbing and buffering structure comprises a plurality of buffer rods (10), one end of each buffer rod (10) is provided with a connecting plate (14), and the connecting plate (14) is fixedly connected to a limiting ring (15).

6. The CNC machine tool spindle rotary joint fixing device according to claim 5, characterized in that: The interior of the connecting plate (14) is a honeycomb structure, and the connecting plate (14) is fixedly connected to the limiting ring (15).

7. The CNC machine tool spindle rotary joint fixing device according to claim 5, characterized in that: The buffer rod (10) comprises a first rod body (11) and a second rod body (12), and the first rod body (11) is slidably connected to the second rod body (12).

8. The CNC machine tool spindle rotary joint fixing device according to claim 7, characterized in that: A rubber block (13) is fixed between the first rod body (11) and the second rod body (12).

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