Rotary table structure and machine tool

Abstract

The utility model relates to the technical field of machine manufacturing, and discloses a rotary table structure which comprises a table board. A first gap is formed between the connecting structure and the table top, and the connecting structure is provided with a first airflow channel and a second airflow channel; the locking mechanism comprises a movable structure; the mounting cavity is divided into a locking cavity and a loosening cavity; a first brake structure; a second brake structure; the elastic piece is suitable for separating the first braking structure from the second braking structure through elastic force when the external air source is disconnected. The first airflow channel and the second airflow channel are arranged on the connecting structure, so that the first gap between the connecting structure and the table top is filled with airflow, external cutting fluid is prevented from entering, the sealing effect between the table top and the connecting structure is achieved, meanwhile, the elastic piece is arranged in the loosening cavity, and when an external air source is disconnected, the elastic piece can be separated from the connecting structure. The elastic piece separates the first braking structure from the second braking structure, so that the rotary table structure is in a loosened state, and the locking mechanism cannot be damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical manufacturing, in particular to a turntable structure and a machine tool. Background Art

[0002] At present, direct-drive turntable seals mostly use contact-type sealing structures such as sealing rings. However, when the turntable structure is used at high speed, the contact-type sealing structure will generate a lot of heat and suffer severe wear. When the wear is severe, there is a risk of water ingress and damage to the turntable structure. On the other hand, when the locking mechanism fails in the air path during high-speed operation, the turntable structure will lock during high-speed operation, which will directly lead to damage to the locking mechanism and, in severe cases, even damage to the direct-drive motor of the turntable structure. Utility Model Content

[0003] In view of this, the utility model provides a turntable structure and a machine tool to solve the sealing problem and the locking problem of the turntable structure under high-speed operation.

[0004] In a first aspect, the utility model provides a turntable structure, comprising:

[0005] mesa;

[0006] A central axis, fixedly connected below the table top;

[0007] A first housing is disposed outside the central axis, and a bearing is disposed between the first housing and the central axis;

[0008] A connecting structure, fixedly connected to the first shell, located between the first shell and the table, with a first gap between the connecting structure and the table, a first airflow channel and a second airflow channel provided on the connecting structure, one side of the first airflow channel is suitable for connecting to a first external air source, and the other side is connected to the first gap through the second airflow channel;

[0009] A locking mechanism is disposed in the first housing, and the locking mechanism comprises:

[0010] Activity structure;

[0011] An installation cavity, wherein the movable structure is movably disposed in the installation cavity and divides the installation cavity into a locking cavity and a releasing cavity, wherein the releasing cavity is located below the locking cavity, the locking cavity is adapted to be communicated with a second external air source, and the releasing cavity is adapted to be communicated with a third external air source;

[0012] A first braking structure is disposed below the release cavity, and an outer side of the first braking structure is fixedly connected to the first housing;

[0013] A second braking structure, the inner side of which is fixedly connected to the central axis and adapted to rotate with the central axis, the second braking structure being spaced apart from the first braking structure and being elastic;

[0014] When the second external air source vents air to the locking cavity, the movable structure moves toward the releasing cavity and drives the second braking structure to press against the first braking structure to brake the central axis; when the third external air source vents air to the releasing cavity, the movable structure moves toward the locking cavity, and the second braking structure is separated from the first braking structure under its elastic force;

[0015] An elastic member is arranged in the release cavity, one end of the elastic member is connected to the movable structure, and the other end is connected to the bottom of the release cavity. The elastic member is suitable for separating the first braking structure from the second braking structure by relying on elastic force when the second external air source and / or the third external air source are disconnected.

[0016] Beneficial effect: By arranging the first air flow channel and the second air flow channel on the connecting structure, the compressed air of the first external air source can be introduced into the first gap between the connecting structure and the table top, so that the first gap between the connecting structure and the table top is filled with air flow, ensuring that the first gap is under positive pressure, and can block external liquid media such as cutting fluid outside the first gap, preventing the entry of external cutting fluid, thereby achieving a sealing effect between the table top and the connecting structure. At the same time, by arranging an elastic part in the release cavity, when the second external air source and / or the first external air source are disconnected, the elastic part can rely on its elastic force to separate the first braking structure from the second braking structure, so that the turntable structure is in a released state and will not damage the locking mechanism.

[0017] In an optional embodiment, the first airflow channel is an annular channel, and the second airflow channel is a connecting channel intersecting the first gap and the first airflow channel;

[0018] and / or, the second air flow channel is provided with a plurality of channels along the circumferential direction;

[0019] And / or, a ninth air flow channel is provided on the top of the connection structure, two sides of the ninth air flow channel are respectively connected to the second air flow channel and the first gap, and the ninth air flow channel is an annular groove.

[0020] Beneficial effect: By setting the first airflow channel and the ninth airflow channel as annular channels, it is convenient to fill the first gap between the connecting structure and the table top with airflow, thereby ensuring the overall sealing between the connecting structure and the table top; by setting multiple second airflow channels along the circumferential direction, it is convenient to quickly transfer the airflow of the first airflow channel to the first gap.

[0021] In an optional embodiment, a third air flow channel is provided in the first shell, one end of the third air flow channel is connected to the first air flow channel, and the other end of the third air flow channel is suitable for being connected to the first external air source.

[0022] In an optional embodiment, the turntable structure includes:

[0023] The second shell is fixedly connected to the bottom of the first shell. A motor and a fourth air flow channel are arranged in the second shell. The fourth air flow channel is arranged on the outside of the motor. One end of the fourth air flow channel is connected to the other end of the third air flow channel, and the other end is suitable for connecting to the first external air source.

[0024] Beneficial effect: Since the table top is a rotating component, by setting a third air flow channel in the first shell and a fourth air flow channel in the second shell, and the fourth air flow channel is used to connect to the first external air source, it is convenient to keep the air flow channel connected to the first external air source as far away from the rotating component as possible to prevent the rotation of the table top from being affected. At the same time, the third air flow channel is set in the first shell, and when the third air flow channel is filled with air flow, it can also have a certain cooling effect on the bearing.

[0025] In an optional embodiment, the first braking structure includes:

[0026] A first braking portion, the outer side of which is fixedly connected to the first housing;

[0027] The second braking part is fixedly connected to the first shell on the outer side, the second braking part is arranged below the first braking part, and the second braking structure is arranged in the second gap between the first braking part and the second braking part, which is suitable for the movable structure to drive the first braking part and the second braking structure to press against the second braking part together when the movable structure moves toward the release cavity.

[0028] Beneficial effect: By setting the first braking structure to include a first braking part and a second braking part, the movable structure can be brought into contact with the first braking part first and then the second braking structure can be pressed against the second braking part, thereby preventing the movable structure from directly pressing the rotating second braking structure against the second braking part, causing direct friction on the movable structure and easily causing wear.

[0029] In an optional embodiment, the first braking structure includes a fixing portion, the fixing portion is fixedly connected to the first housing and is located below the release cavity, and the outer side of the first braking portion is fixedly connected below the fixing portion;

[0030] And / or, the first braking part is an elastic annular brake pad;

[0031] And / or, the second braking part is an annular brake block.

[0032] In an optional embodiment, the elastic member is a spring;

[0033] And / or, the second braking structure is an annular dynamic brake pad connected to the central axis.

[0034] In an optional embodiment, a fifth air flow channel is provided in the first housing, one end of the fifth air flow channel is connected to the locking cavity, and the other end is suitable for connecting to the second external air source;

[0035] And / or, a sixth air flow channel is provided in the first shell, one end of the sixth air flow channel is connected to the release cavity, and the other end is suitable for being connected to the third external air source.

[0036] In an optional embodiment, a seventh air flow channel is provided in the second shell of the turntable structure, one end of the seventh air flow channel is connected to the other end of the fifth air flow channel, and the other end is suitable for connecting to the second external air source;

[0037] And / or, an eighth air flow channel is provided in the second shell of the turntable structure, one end of the eighth air flow channel is connected to the other end of the sixth air flow channel, and the other end is suitable for being connected to the third external air source.

[0038] Beneficial effect: By arranging the seventh air flow channel and the eighth air flow channel in the second shell, which are respectively connected to the second external air source and the third external air source, the air flow channels connected to the external air sources can be concentrated in the second shell, making the overall structure more compact.

[0039] In a second aspect, the utility model further provides a machine tool, comprising: the above-mentioned turntable structure.

[0040] Beneficial effect: Since the machine tool includes the above-mentioned turntable structure, it has the same effect as the above-mentioned turntable structure, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 A cross-sectional view of a turntable structure according to an embodiment of the utility model;

[0043] Figure 2 for Figure 1 A partial enlarged view of

[0044] Figure 3 for Figure 2 A partial enlarged view of middle A;

[0045] Figure 4 is a top view of the connection structure;

[0046] Figure 5 is a cross-sectional view of the connection structure;

[0047] Figure 6 A partial cross-sectional view of the first shell and the second shell;

[0048] Figure 7 A partial cross-sectional view of the first shell and the second shell from another perspective.

[0049] Description of reference numerals:

[0050] 1-table; 2-central axis; 3-first shell; 4-bearing; 5-connecting structure; 6-locking mechanism; 601-movable structure; 602-locking chamber; 603-relaxing chamber; 604-second braking structure; 605-elastic member; 606-first braking part; 607-second braking part; 608-fixing part; 7-first air flow channel; 8-second air flow channel; 9-third air flow channel; 10-fourth air flow channel; 11-fifth air flow channel; 12-sixth air flow channel; 13-seventh air flow channel; 14-eighth air flow channel; 15-ninth air flow channel; 16-second shell; 17-inlet connector. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0052] Combine the following Figures 1 to 7 , describing an embodiment of the utility model.

[0053] According to an embodiment of the utility model, on the one hand, a turntable structure is provided, comprising: a table 1; a central axis 2, fixedly connected to the bottom of the table 1; a first shell 3, arranged on the outside of the central axis 2, a bearing 4 is arranged between the first shell 3 and the central axis 2; a connecting structure 5, fixedly connected to the first shell 3, located between the first shell 3 and the table 1, a first gap is provided between the connecting structure 5 and the table 1, a first air flow channel 7 and a second air flow channel 8 are provided on the connecting structure 5, one side of the first air flow channel 7 is suitable for connecting to a first external air source, and the other side is connected to the first gap through the second air flow channel 8; a locking mechanism 6, arranged in the first shell 3, the locking mechanism 6 comprises: a movable structure 601; an installation cavity, the movable structure 601 is movably arranged in the installation cavity, and the installation cavity is divided into a locking cavity 602 and a release cavity 603, the release cavity 603 is located below the locking cavity 602, the locking cavity 602 is suitable for connecting to the second external air source, and the release cavity 603 is suitable for connecting to the third external air source; a first braking structure , arranged below the release chamber 603, the outer side of the first brake structure is fixedly connected to the first housing 3; the second brake structure 604, the inner side is fixedly connected to the central axis 2, suitable for rotating with the central axis 2, the second brake structure 604 is spaced apart from the first brake structure, and the second brake structure 604 is elastic; suitable for when the second external air source ventilates the locking chamber 602, the movable structure 601 moves toward the release chamber 603, and drives the second brake structure 604 to press against the first brake structure to brake the central axis 2; When the third external air source ventilates the release chamber 603, the movable structure 601 moves toward the locking chamber 602, and the second braking structure 604 is separated from the first braking structure under its elastic force; the elastic member 605 is arranged in the release chamber 603, one end of the elastic member 605 is connected to the movable structure 601, and the other end is connected to the bottom of the release chamber 603, and the elastic member 605 is suitable for separating the first braking structure from the second braking structure 604 by relying on the elastic force when the second external air source and / or the third external air source are disconnected.

[0054] By arranging the first air flow channel 7 and the second air flow channel 8 on the connecting structure 5, the compressed air of the first external air source can be introduced into the first gap between the connecting structure 5 and the table top 1, so that the first gap between the connecting structure 5 and the table top 1 is filled with air flow, ensuring that the first gap is under positive pressure, and can block external liquid media such as cutting fluid outside the first gap, preventing the entry of external cutting fluid, thereby achieving a sealing effect between the table top 1 and the connecting structure 5. At the same time, by arranging the elastic member 605 in the release cavity 603, when the second external air source and / or the first external air source are disconnected, the elastic member 605 can rely on its elastic force to separate the first braking structure from the second braking structure 604, so that the turntable structure is in a released state and will not damage the locking mechanism 6.

[0055] Among them, Figure 5As shown, the first airflow channel 7 in this embodiment is an annular channel, and the second airflow channel 8 is a connecting channel arranged to intersect the first gap and the first airflow channel 7. Specifically, the two ends of the second airflow channel 8 are respectively arranged perpendicular to the first gap and the first airflow channel 7. As a convertible embodiment, the second airflow channel 8 can also be arranged to be inclined vertically.

[0056] like Figure 5 As shown, a ninth airflow channel 15 is provided at the top of the connection structure 5, and the upper and lower sides of the ninth airflow channel 15 are respectively connected to the second airflow channel 8 and the first gap, and the ninth airflow channel 15 is an annular groove. By setting the first airflow channel 7 and the ninth airflow channel 15 as annular channels, it is convenient to fill the first gap between the connection structure 5 and the table top 1 with airflow, thereby ensuring the overall sealing between the connection structure 5 and the table top 1.

[0057] like Figure 4 As shown, multiple second airflow channels 8 are provided along the circumferential direction and are evenly arranged. By providing multiple second airflow channels 8 along the circumferential direction, it is convenient to quickly transfer the airflow of the first airflow channel 7 to the first gap. As a convertible embodiment, it is also possible to provide one second airflow channel 8, in which case it can be provided as an annular vertical airflow channel.

[0058] like Figure 2 As shown, in this embodiment, a third air flow channel 9 is provided in the first housing 3, and one end of the third air flow channel 9 is connected to the first air flow channel 7;

[0059] The turntable structure includes: a second shell 16, which is fixedly connected to the bottom of the first shell 3. A motor and a fourth air flow channel 10 are arranged in the second shell 16. The fourth air flow channel 10 is arranged on the outside of the motor. One end of the fourth air flow channel 10 is connected to the other end of the third air flow channel 9, and the other end is suitable for connecting to the first external air source.

[0060] Since the table top 1 is a rotating component, a third air flow channel 9 is arranged in the first shell 3, and a fourth air flow channel 10 is arranged in the second shell 16, and the fourth air flow channel 10 is used to connect to the first external air source, so that the air flow channel connected to the first external air source is as far away from the rotating component as possible to prevent the rotation of the table top 1 from being affected. At the same time, the third air flow channel 9 is arranged in the first shell 3. When the third air flow channel 9 is filled with air flow, it can also have a certain cooling effect on the bearing 4.

[0061] Of course, in other embodiments, only the third air flow channel 9 may be provided in the first shell 3 , and connected to the first external air source through the third air flow channel 9 , without providing the fourth air flow channel 10 in the second shell 16 .

[0062] In this embodiment, the first housing 3 is a bearing chamber, the second housing 16 is an outer shell of the turntable structure, and the outer side of the first housing 3 is connected to the second housing 16 by screws.

[0063] like Figure 2 As shown, the first braking structure in this embodiment includes: a first braking portion 606, the outer side of which is fixedly connected to the first housing 3; a second braking portion 607, the outer side of which is fixedly connected to the first housing 3, and the second braking portion 607 is spaced below the first braking portion 606, as shown in FIG. Figure 3 As shown, the second braking structure 604 is arranged in the second gap between the first braking part 606 and the second braking part 607, and is suitable for the movable structure 601 to drive the first braking part 606 and the second braking structure 604 to press against the second braking part 607 together when the movable structure 601 moves toward the release cavity 603; the fixing part 608, the fixing part 608 is fixedly connected to the first housing 3, and is located below the release cavity 603, and the outer sides of the first braking part 606 and the second braking part 607 are fixedly connected below the fixing part 608. Specifically, the outer side of the first braking part 606, the outer side of the second braking part 607 and the fixing part 608 are fixedly connected to the first housing 3 by screws.

[0064] By setting the first braking structure to include the first braking part 606 and the second braking part 607, the movable structure 601 can be first brought into contact with the first braking part 606 and then the second braking structure 604 can be pressed against the second braking part 607, thereby preventing the movable structure 601 from directly pressing the rotating second braking structure 604 against the second braking part 607, causing direct friction on the movable structure 601 and easily causing wear. As a convertible embodiment, the first braking structure can also include only the first braking part 606 and the second braking part 607. Figure 1 As shown, the movable structure 601 in this embodiment is a locking ring, which is overall T-shaped and can save space. At the same time, a fixing part 608 is set in the right space of the T-shaped vertical part to facilitate the fixed connection between the first braking part 606 and the second braking part 607 and the first shell 3.

[0065] like Figure 2 As shown, the second braking structure 604 is fixedly connected to the central shaft 2 via screws, and rotates with the central shaft 2 in the second gap.

[0066] Specifically, the first brake part 606 is an elastic annular brake pad, which can be set to be thinner; the second brake structure 604 is an annular movable brake pad connected to the central axis 2, which can be set to be thinner; the first brake part 606 and the second brake structure 604 are set to be thinner to facilitate movement with the movable structure 601. The second brake part 607 is an annular brake block, which can be set to be thicker; the elastic member 605 is a spring, and multiple elastic members 605 can be evenly distributed in the circumferential direction in the annular release cavity 603; the fixed part 608 is a baffle.

[0067] like Figure 6 and Figure 7 As shown, in this embodiment, a fifth air flow channel 11 is provided in the first shell 3, one end of the fifth air flow channel 11 is connected to the locking cavity 602, and the other end is suitable for connecting to the second external air source; a sixth air flow channel 12 is provided in the first shell 3, one end of the sixth air flow channel 12 is connected to the release cavity 603, and the other end is suitable for connecting to the third external air source.

[0068] like Figure 6 and Figure 7 As shown, a seventh airflow channel 13 is provided in the second shell 16 of the turntable structure, and the fifth airflow channel 11 is connected to the second external air source through the seventh airflow channel 13, specifically, one end of the seventh airflow channel 13 is connected to the other end of the fifth airflow channel 11, and the other end is suitable for connecting to the second external air source; an eighth airflow channel 14 is provided in the second shell 16 of the turntable structure, and the sixth airflow channel 12 is connected to the third external air source through the eighth airflow channel 14, specifically, one end of the eighth airflow channel 14 is connected to the other end of the sixth airflow channel 12, and the other end is suitable for connecting to the third external air source. By arranging the seventh airflow channel 13 and the eighth airflow channel 14 in the second shell 16, and connecting them to the second external air source and the third external air source respectively, the airflow channels connected to the external air source can be concentrated in the second shell 16, making the overall structure more compact.

[0069] The specific positions of the fifth airflow channel 11 and the sixth airflow channel 12 in the first housing 3 are not limited, as long as they are arranged at intervals. The specific positions of the seventh airflow channel 13 and the eighth airflow channel 14 in the second housing 16 are not limited, as long as they are arranged at intervals.

[0070] Three air inlet connectors 17 are disposed on the outer side of the second housing 16 and are respectively connected to the fourth air flow channel 10 , the seventh air flow channel 13 and the eighth air flow channel 14 , so as to make the overall structure more compact.

[0071] The turntable structure in this embodiment introduces external compressed air into the interior of the annular first airflow channel 7 formed by the first shell 3 and the connecting structure 5 through the airflow channels processed in the first shell 3 and the second shell 16. The gas entering the first airflow channel 7 passes through the second airflow channel 8 evenly distributed on the connecting structure 5, and the airflow is evenly transported to the ninth airflow channel 15. The airflow is evenly distributed again through the annular groove to form an annular airflow in the tiny mechanical sealing gap outside the table 1 and the connecting structure 5. The airflow formed by the compressed air in the gap blocks the external liquid medium such as the cutting fluid outside the gap to achieve the internal sealing effect. At the same time, the gas passes into the turntable structure to ensure that the interior of the turntable structure is under positive pressure, further preventing the entry of external cutting fluid.

[0072] The turntable structure in this embodiment can ensure accuracy, reduce the number of workpieces and reduce the risk of leakage caused by splicing by integrating the installation cavity of the locking mechanism 6 under the first shell 3. When locking, compressed air is introduced into the locking cavity 602, and the movable structure 601 is pushed to press the second brake structure 604 and the first brake part 606 onto the second brake part 607 under the action of air pressure, generating a friction torque to generate a turntable locking torque; when releasing, compressed air is introduced into the release cavity 603, and the movable structure 601 is pushed back under the action of air pressure, and the gap between the movable structure 601, the second brake structure 604, the first brake part 606 and the second brake part 607 is restored, allowing the second brake structure 604 to rotate. In order to prevent the turntable structure from suddenly being cut off when running at high speed, causing the movable structure 601 to press the second brake structure 604 and damage the locking mechanism 6 and the motor, an elastic part 605 is designed in the release chamber 603 to ensure that the turntable structure remains in a released state when the gas is cut off, and the locking mechanism 6 and the motor of the turntable structure are not damaged.

[0073] At the same time, the turntable structure in this embodiment realizes the combination of rotation support, braking and sealing of the turntable structure by setting the first shell 3. The outer side of the first shell 3 is directly fixed on the second shell 16 of the turntable structure, which reduces the number of assembly parts of the rotation support mounting seat, brake mechanism mounting components and sealing components, ensures the overall rigidity and precision of the turntable structure, and can greatly enhance the stability and service life of the turntable structure for a high turntable structure with a linear speed of about 2000.

[0074] According to an embodiment of the present utility model, on the other hand, a machine tool is provided, comprising: the above-mentioned turntable structure.

[0075] Specifically, the machine tool in this embodiment is a CNC machine tool.

[0076] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A turntable structure, characterized in that: include: Countertop (1); A central axis (2) fixedly connected below the table top (1); A first shell (3) is arranged outside the central axis (2), and a bearing (4) is arranged between the first shell (3) and the central axis (2); a connecting structure (5) fixedly connected to the first shell (3) and located between the first shell (3) and the table top (1); a first gap is defined between the connecting structure (5) and the table top (1); a first air flow channel (7) and a second air flow channel (8) are provided on the connecting structure (5); one side of the first air flow channel (7) is suitable for being connected to a first external air source, and the other side is connected to the first gap via the second air flow channel (8); A locking mechanism (6) is arranged in the first housing (3), and the locking mechanism (6) comprises: Activity Structure (601); An installation cavity, wherein the movable structure (601) is movably disposed in the installation cavity and divides the installation cavity into a locking cavity (602) and a releasing cavity (603), wherein the releasing cavity (603) is located below the locking cavity (602), wherein the locking cavity (602) is adapted to be communicated with a second external air source, and wherein the releasing cavity (603) is adapted to be communicated with a third external air source; A first braking structure is arranged below the release cavity (603), and the outer side of the first braking structure is fixedly connected to the first housing (3); A second braking structure (604), the inner side of which is fixedly connected to the central shaft (2) and is suitable for rotating with the central shaft (2), the second braking structure (604) and the first braking structure are arranged at a distance, and the second braking structure (604) is elastic; When the second external air source is ventilated to the locking chamber (602), the movable structure (601) moves toward the releasing chamber (603) and drives the second braking structure (604) to press against the first braking structure to brake the central axis (2); when the third external air source is ventilated to the releasing chamber (603), the movable structure (601) moves toward the locking chamber (602), and the second braking structure (604) is separated from the first braking structure under its elastic force; An elastic member (605) is disposed in the release cavity (603), one end of the elastic member (605) is connected to the movable structure (601), and the other end is connected to the bottom of the release cavity (603), and the elastic member (605) is suitable for separating the first braking structure from the second braking structure (604) by elastic force when the second external air source and / or the third external air source are disconnected.

2. The turntable structure according to claim 1, characterized in that: The first airflow channel (7) is an annular channel, and the second airflow channel (8) is a connecting channel arranged to intersect the first gap and the first airflow channel (7); and / or, along the circumferential direction, the second air flow channel (8) is provided with a plurality of channels; And / or, a ninth airflow channel (15) is provided on the top of the connecting structure (5), and two sides of the ninth airflow channel (15) are respectively connected to the second airflow channel (8) and the first gap, and the ninth airflow channel (15) is an annular groove.

3. The turntable structure according to claim 1, characterized in that: A third air flow channel (9) is provided in the first shell (3); one end of the third air flow channel (9) is connected to the first air flow channel (7), and the other end is suitable for being connected to the first external air source.

4. The turntable structure according to claim 3, characterized in that: The turntable structure comprises: The second shell (16) is fixedly connected to the bottom of the first shell (3), and a motor and a fourth air flow channel (10) are arranged in the second shell (16). The fourth air flow channel (10) is arranged on the outside of the motor. One end of the fourth air flow channel (10) is connected to the other end of the third air flow channel (9), and the other end is suitable for connecting to the first external air source.

5. The turntable structure according to any one of claims 1 to 4, characterized in that: The first braking structure comprises: A first braking portion (606), the outer side of which is fixedly connected to the first shell (3); The second braking portion (607) is fixedly connected to the first shell (3) on the outer side. The second braking portion (607) is arranged below the first braking portion (606). The second braking structure (604) is arranged in a second gap between the first braking portion (606) and the second braking portion (607). It is suitable for the movable structure (601) to drive the first braking portion (606) and the second braking structure (604) to press against the second braking portion (607) when the movable structure (601) moves toward the release cavity (603).

6. The turntable structure according to claim 5, characterized in that: The first braking structure comprises a fixing portion (608), the fixing portion (608) is fixedly connected to the first housing (3) and is located below the release cavity (603), and the outer side of the first braking portion (606) is fixedly connected below the fixing portion (608); And / or, the first braking portion (606) is an elastic annular brake pad; And / or, the second braking portion (607) is an annular brake block.

7. The turntable structure according to any one of claims 1 to 4, characterized in that: The elastic member (605) is a spring; And / or, the second braking structure (604) is an annular dynamic brake pad connected to the central shaft (2).

8. The turntable structure according to any one of claims 1 to 4, characterized in that: A fifth air flow channel (11) is provided in the first shell (3), one end of the fifth air flow channel (11) is connected to the locking cavity (602), and the other end is suitable for connecting to the second external air source; And / or, a sixth air flow channel (12) is provided in the first shell (3), one end of the sixth air flow channel (12) is connected to the release cavity (603), and the other end is suitable for connecting to the third external air source.

9. The turntable structure according to claim 8, characterized in that: A seventh air flow channel (13) is provided in the second shell (16) of the turntable structure, one end of the seventh air flow channel (13) is connected to the other end of the fifth air flow channel (11), and the other end is suitable for being connected to the second external air source; And / or, an eighth air flow channel (14) is provided in the second shell (16) of the turntable structure, one end of the eighth air flow channel (14) is connected to the other end of the sixth air flow channel (12), and the other end is suitable for being connected to the third external air source.

10. A machine tool, characterized in that: include: The turntable structure according to any one of claims 1 to 9.

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