Labyrinth type air curtain protection device for machine tool spindle

Abstract

The utility model discloses a machine tool spindle labyrinth type air curtain protection device which comprises a spindle body and further comprises an air curtain ring, a spindle front cover and a waterproof cover, the air curtain ring and the waterproof cover are fixed to the end of the spindle body through the spindle front cover, a first ring groove is formed in the outer wall of the waterproof cover, and a first blocking ring is arranged at the end of the air curtain ring. A first air chamber is formed between the first annular groove and the first plugging ring, a second air chamber is formed between the end of the waterproof cover and the inner bottom face of the air curtain ring, and the first air chamber is connected with the second air chamber. According to the labyrinth type air curtain protection device for the machine tool spindle, the distance between the end face of the spindle and the bearing can be reduced while the air curtain labyrinth is achieved, so that the strength of the spindle body can be improved, dust and liquid can be prevented from entering the spindle bearing through the air curtain labyrinth formed by the first air chamber and the second air chamber, and the spindle bearing is protected. And the bearing can be protected.

Description

Technical Field

[0001] This utility model relates to the field of machine tool spindle production technology, and more specifically to a labyrinth-type air curtain protection device for machine tool spindles. Background Technology

[0002] The core supporting component of a machining center spindle is the high-speed, precision spindle bearing. Even the smallest impurities entering the spindle bearing can affect its accuracy and lifespan, making its sealing characteristics extremely important. Air curtain protection, commonly known as an air seal, is primarily used to protect the bearing from external contaminants such as cutting fluid and metal shavings, preventing damage.

[0003] According to invention patent application CN106246925A, published on December 21, 2016, a labyrinth-type machine tool spindle air curtain protection device is disclosed. It includes an end cover mounted on the machine tool spindle. The end cover has a first airflow channel, one end of which is connected to an air inlet, and the other end is connected to a second airflow channel in the end cover. The end cover includes a labyrinth disk and a labyrinth seat. The labyrinth disk is nested in the labyrinth seat, thus forming the second airflow channel between the labyrinth disk and the labyrinth seat. Gas enters the first airflow channel from the air inlet and exits through the second airflow channel. The air curtain protection device also includes a sealing cover, which cooperates with the end cover to form a third airflow channel, which is connected to the second airflow channel. Its main technical advantage is that a groove is machined on the radial inclined surface of the labyrinth disk to form an exhaust hole, thus significantly simplifying the machining difficulty of the air curtain protection device.

[0004] In existing technologies, multiple spacers are used to form a labyrinth loop to achieve dust prevention. However, using multiple spacers results in an excessively long distance between the bearing and the spindle end face, weakening the rigidity. Therefore, a labyrinth-type air curtain protection device for machine tool spindles is proposed to solve the problem of excessively long distance between the bearing and the spindle end face and weakened spindle rigidity caused by using multiple spacers in existing technologies. Utility Model Content

[0005] The purpose of this invention is to provide a labyrinth-type air curtain protection device for machine tool spindles, which aims to solve the problem that the use of multiple spacers in the prior art leads to an excessively long distance between the bearing and the spindle end face, resulting in weakened spindle rigidity.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A labyrinth-type air curtain protection device for machine tool spindles includes a spindle body, an air curtain ring, a spindle front cover, and a waterproof cover. The air curtain ring and the waterproof cover are both fixed to the end of the spindle body via the spindle front cover. The outer wall of the waterproof cover has a first annular groove, and the end of the air curtain ring is provided with a first sealing ring. A first air chamber is formed between the first annular groove and the first sealing ring. The end of the waterproof cover and the inner bottom surface of the air curtain ring form a second air chamber, and the first air chamber and the second air chamber are connected.

[0008] Preferably, the outer wall of the waterproof cover is provided with an annular groove, the inner wall of one side of the main shaft front cover is provided with an inclined cavity, the annular groove and the inclined cavity form a third air chamber, the main shaft body is provided with a flange, the flange is provided with a vent hole, the vent hole is connected to the third air chamber, and a first gas channel is provided between the third air chamber and the first air chamber.

[0009] Preferably, the waterproof cover has a first sealing protrusion at its end and a second sealing protrusion at the end face of the main shaft front cover. A fourth air chamber is formed between the first sealing protrusion and the second sealing protrusion. The fourth air chamber is connected to the third air chamber, and a second gas channel is provided between the fourth air chamber and the third air chamber.

[0010] Preferably, a spindle is provided inside the main shaft body, a positioning groove is provided on the outer wall of the spindle, and positioning blocks are symmetrically arranged on the inner wall of the waterproof cover. The waterproof cover is slidably connected to the spindle through the positioning blocks and the positioning groove.

[0011] Preferably, a first groove is provided on the inner wall of the main shaft front cover, and a first ventilation cavity is formed between the first groove and the top outer wall of the air curtain ring. The first ventilation cavity is connected to the third air chamber and the ventilation hole respectively.

[0012] Preferably, a first mounting groove is provided on the outer wall of the spindle, a waterproof rubber ring is installed in the first mounting groove, and a waterproof rubber ring is provided between the air curtain ring and the spindle body.

[0013] In the above technical solution, the labyrinth-type air curtain protection device for machine tool spindles provided by this utility model has the following beneficial effects:

[0014] In this invention, both the air curtain ring and the waterproof cover are fixed to the main shaft body via the front cover of the main shaft. A first air chamber is formed by the first sealing ring on the air curtain ring and the first annular groove on the waterproof cover. A second air chamber is formed by the end of the waterproof cover and the inner bottom surface of the air curtain ring. The first and second air chambers are connected to form an air curtain labyrinth. This air curtain labyrinth can reduce the distance between the end face of the main shaft and the bearing while realizing the air curtain labyrinth, thereby improving the strength of the main shaft body. At the same time, the air curtain labyrinth formed by the first and second air chambers can prevent dust and liquid from entering the main shaft bearing, thus protecting the bearing. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0016] Figure 1 A schematic diagram of the overall structure provided for an embodiment of this utility model;

[0017] Figure 2 This is a schematic diagram of the assembly structure provided for an embodiment of the present utility model;

[0018] Figure 3 This is a partial cross-sectional structural schematic diagram provided for an embodiment of the present utility model;

[0019] Figure 4 This is a schematic diagram of the vent connection structure provided in an embodiment of the present utility model;

[0020] Figure 5 A schematic diagram of the gas channel structure provided for an embodiment of this utility model.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Spindle body; 11. Flange; 12. Vent hole; 13. Mandrel; 14. Positioning groove; 15. First venting chamber; 2. Air curtain ring; 21. First sealing ring; 3. Spindle front cover; 31. Inclined chamber; 32. Second sealing edge protrusion; 33. First groove; 4. Waterproof cover; 41. First annular groove; 42. Circular groove; 43. First sealing edge protrusion; 44. Positioning block; 5. First air chamber; 6. Second air chamber; 7. Third air chamber; 8. Fourth air chamber; 9. First gas passage; 10. Second gas passage. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0024] Please see Figure 1 —5, a machine tool spindle labyrinth-type air curtain protection device, including a spindle body 1, an air curtain ring 2, a spindle front cover 3, and a waterproof cover 4. The air curtain ring 2 and the waterproof cover 4 are both fixed to the end of the spindle body 1 through the spindle front cover 3. The outer wall of the waterproof cover 4 is provided with a first annular groove 41. The end of the air curtain ring 2 is provided with a first sealing ring 21. A first air chamber 5 is formed between the first annular groove 41 and the first sealing ring 21. The end of the waterproof cover 4 and the inner bottom surface of the air curtain ring 2 form a second air chamber 6. The first air chamber 5 and the second air chamber 6 are connected.

[0025] Specifically, the spindle body 1 is a conventional machining center spindle. A mandrel 13 is provided on the outer wall of one end of the spindle body 1. Positioning grooves 14 are symmetrically formed on the outer wall of the mandrel 13. Positioning blocks 44 are symmetrically arranged on the inner wall of the waterproof ring. The shape of the positioning blocks 44 is adapted to the positioning grooves 14, so that the waterproof cover 4 can be quickly installed onto the mandrel 13 through the positioning blocks 44. The waterproof cover 4 can be fixed to the end face of the mandrel 13 with screws. In addition, the air curtain ring 2 can be fixed to the end of the mandrel 13 through the waterproof cover 4. Figure 2 and Figure 1 As shown, the spindle front cover 3 is also fixed to the spindle body 1 with screws. Furthermore, as... Figure 5 As shown, a first annular groove 41 is formed on the circumferential outer wall of the waterproof cover 4, and a first sealing ring 21 is provided at the end of the air curtain ring 2. A first air chamber 5 is formed between the first annular groove 41 and the first sealing ring 21. A second air chamber 6 is formed between the end of the waterproof cover 4 and the inner bottom surface of the air curtain ring 2, and the second air chamber 6 is in communication with the first air chamber 5. Figure 3 and Figure 4 As shown, the outer diameter of the bottom end of the waterproof cover 4 is smaller than the inner diameter of the air curtain ring 2, allowing the first air chamber 5 and the second air chamber 6 to communicate. The waterproof cover 4 and the air curtain ring 2 achieve the air curtain labyrinth design implemented by two rings in the prior art, which reduces the distance between the end face of the spindle body 1 and the bearing, thereby enhancing the overall strength of the spindle body 1.

[0026] As a further embodiment provided by this utility model, such as Figure 5 As shown, an annular groove 42 is formed on the outer wall of the waterproof cover 4, and an inclined cavity 31 is formed on the inner wall of the main shaft front cover 3. When the waterproof cover 4 and the main shaft front cover 3 are fixed to the main shaft body 1, the annular groove 42 and the inclined cavity 31 form a third air chamber 7. A flange 11 is fixedly installed on the main shaft body 1, and a vent hole 12 is formed on the flange 11. The vent hole 12 is connected to the third air chamber 7. A first gas channel 9 is provided between the third air chamber 7 and the first air chamber 5. Figure 5As shown, the outer diameter of the bottom of the annular groove 42 is smaller than the inner diameter of the top of the air curtain ring 2, so that the third air chamber 7 and the first air chamber 5 can remain in communication.

[0027] As an embodiment provided by this utility model, such as Figure 3 As shown, a first sealing protrusion 43 is provided on the end edge of the waterproof cover 4, and a second sealing protrusion 32 is provided on the end face of the spindle front cover 3. A fourth air chamber 8 is formed between the first sealing protrusion 43 and the second sealing protrusion 32. A second gas channel 10 is provided between the fourth air chamber 8 and the third air chamber 7. The fourth air chamber 8 and the third air chamber 7 are connected by the outer diameter of the upper edge end face of the annular groove 42 on the waterproof cover 4 being smaller than the inner diameter of the end face of the spindle front cover 3. Preferably, the distance between the first sealing protrusion 43 and the second sealing protrusion 32 is greater than the distance between the outer diameter of the upper edge end face of the annular groove 42 and the inner diameter of the end face of the spindle front cover 3. This allows air to flow towards the fourth air chamber 8 when it enters the third air chamber 7 from the vent hole 12, thereby preventing it from entering the first air chamber 5 and the second air chamber 6, achieving the effect of dustproof and waterproof, preventing bearing damage, and extending the bearing service life. Figure 5 , Figure 4 and Figure 3 As shown, the black arrow indicates the direction of gas flow in the air curtain maze provided in this embodiment of the invention.

[0028] A first groove 33 is provided on the inner wall of the front cover 3 of the main shaft. The first groove 33 and the top outer wall of the air curtain ring 2 form a first ventilation cavity 15. The first ventilation cavity 15 is connected to the third air chamber 7 and the ventilation hole 12 respectively, and can guide the gas from the ventilation hole 12 to the third air chamber 7.

[0029] A first mounting groove is formed on the outer wall of the spindle 13, and a waterproof rubber ring is installed in the first mounting groove. A waterproof rubber ring is also provided between the air curtain ring 2 and the spindle body 1. The waterproof rubber ring inside the first mounting groove can ensure the airtightness between the inner wall of the waterproof cover 4 and the outer wall of the spindle 13, and the waterproof rubber ring provided between the air curtain ring 2 and the spindle body 1 can ensure the airtightness between the edge of the air curtain ring 2 and the spindle body 1.

[0030] In this utility model, both the air curtain ring 2 and the waterproof cover 4 are fixed to the main shaft body 1 by the main shaft front cover 3. The first air chamber 5 is formed by the first sealing ring 21 set on the air curtain ring 2 and the first annular groove 41 opened on the waterproof cover 4. The second air chamber 6 is formed by the end of the waterproof cover 4 and the inner bottom surface of the air curtain ring 2. The first air chamber 5 and the second air chamber 6 are connected to form an air curtain labyrinth. While realizing the air curtain labyrinth, the distance between the end face of the main shaft and the bearing can be reduced, thereby improving the strength of the main shaft body 1. At the same time, the air curtain labyrinth formed by the first air chamber 5 and the second air chamber 6 can prevent dust and liquid from entering the main shaft bearing, thus protecting the bearing.

[0031] Those skilled in the art will understand that other similar connection methods can also achieve this utility model. For example, welding, bonding, or screwing.

[0032] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A labyrinth-type air curtain protection device for machine tool spindles, comprising a spindle body (1), characterized in that, It also includes an air curtain ring (2), a spindle front cover (3) and a waterproof cover (4). The air curtain ring (2) and the waterproof cover (4) are both fixed to the end of the spindle body (1) by the spindle front cover (3). The outer wall of the waterproof cover (4) is provided with a first annular groove (41). The end of the air curtain ring (2) is provided with a first sealing ring (21). A first air chamber (5) is formed between the first annular groove (41) and the first sealing ring (21). The end of the waterproof cover (4) and the inner bottom surface of the air curtain ring (2) form a second air chamber (6). The first air chamber (5) and the second air chamber (6) are connected.

2. The machine tool spindle labyrinth-type air curtain protection device according to claim 1, characterized in that, The waterproof cover (4) has an annular groove (42) on its outer wall. The main shaft front cover (3) has an inclined cavity (31) on its inner wall. The annular groove (42) and the inclined cavity (31) form a third air chamber (7). The main shaft body (1) has a flange (11) on it. The flange (11) has a vent hole (12) on it. The vent hole (12) is connected to the third air chamber (7). The third air chamber (7) and the first air chamber (5) have a first gas channel (9).

3. The machine tool spindle labyrinth-type air curtain protection device according to claim 2, characterized in that, The waterproof cover (4) has a first sealing protrusion (43) at its end, and the main shaft front cover (3) has a second sealing protrusion (32) at its end face. A fourth air chamber (8) is formed between the first sealing protrusion (43) and the second sealing protrusion (32). The fourth air chamber (8) is connected to the third air chamber (7). A second gas channel (10) is provided between the fourth air chamber (8) and the third air chamber (7).

4. The machine tool spindle labyrinth-type air curtain protection device according to claim 1, characterized in that, The spindle body (1) is provided with a spindle (13) inside. The outer wall of the spindle (13) is provided with a positioning groove (14). The inner wall of the waterproof cover (4) is symmetrically provided with positioning blocks (44). The waterproof cover (4) is slidably connected to the spindle (13) through the positioning blocks (44) and the positioning groove (14).

5. A labyrinth-type air curtain protection device for machine tool spindles according to claim 2, characterized in that, The main shaft front cover (3) has a first groove (33) on its circumferential inner wall. The first groove (33) and the top outer wall of the air curtain ring (2) form a first ventilation cavity (15). The first ventilation cavity (15) is connected to the third air chamber (7) and the ventilation hole (12) respectively.

6. A labyrinth-type air curtain protection device for machine tool spindles according to claim 4, characterized in that, The outer wall of the spindle (13) is provided with a first mounting groove, and a waterproof rubber ring is installed in the first mounting groove. A waterproof rubber ring is provided between the air curtain ring (2) and the main shaft body (1).

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