A direct drive rotary table applied to a high-precision five-axis linkage machining center

Abstract

The application relates to a direct-drive rotary table applied to a high-precision five-axis linkage machining center, which comprises an A-axis rotary table used for being mounted on a machine body, a swing arm body with one end connected with the A-axis rotary table, a C-axis rotary table arranged on the swing arm body, a tail end mounting seat used for being mounted on the machine body, the tail end mounting seat being in the form of a ring-shaped workpiece coaxially arranged with the A-axis rotary table, and a tail end rotary shaft with one end rotatingly and dampingly slidingly penetrating the inner side of the tail end mounting seat and the other end connected with the one end of the swing arm body away from the A-axis rotary table. The application has the effect of facilitating the assembly of the direct-drive rotary table on the machine body.

Description

Technical Field

[0001] This application relates to the field of CNC rotary tables, and in particular to a direct-drive rotary table used in high-precision five-axis linkage machining centers. Background Technology

[0002] A five-axis machining center, also known as a five-axis linkage machining center, is a high-tech, high-precision machining center specifically designed for machining complex curved surfaces. A five-axis linkage machining center can perform machining in five degrees of freedom, including linear movement on the XYZ axes and rotational movement on the AC axes. The rotational movement on the AC axes is achieved through a direct-drive rotary table.

[0003] In related technologies, such as CN116475775A, a cradle-type third harmonic five-axis turntable is disclosed. In this turntable, the rear rotating part of the hydraulic rotary joint 47 is connected to the other end of the cradle housing 3 by a seventeenth screw. The front stationary part of the hydraulic rotary joint 47 is mounted on the driven support housing 4 by a joint mounting bracket 48. The joint mounting bracket 48 provides radial support, and an eighteenth screw is used to tighten the joint mounting bracket 48 into the groove of the rear stationary part of the hydraulic rotary joint 47 to prevent it from rotating radially. This ensures that when the rear rotating part of the hydraulic rotary joint 47 rotates, the hydraulic lines connected to the front stationary part of the hydraulic rotary joint 47 do not become entangled with it.

[0004] Regarding the aforementioned technologies, there is a drawback: because the hydraulic rotary joint is fixedly mounted on the driven support shell via a joint mounting bracket, and the position of the hydraulic rotary joint on the driven support shell cannot be changed, the turntable installation process is as follows: first, make the two ends of the cradle machine shell coaxial; then, fix the main end to one end of the cradle machine shell; and then fix the tail end to the other end of the cradle machine shell. The cradle machine shell needs to be hoisted, so it is not convenient to align the two ends of the cradle machine shell coaxially, resulting in the defect that the direct drive turntable is not easy to assemble onto the machine body. Summary of the Invention

[0005] To facilitate the mounting of the direct drive rotary table onto the machine body, this application provides a direct drive rotary table for use in a high-precision five-axis linkage machining center.

[0006] This application provides a direct-drive rotary table for use in a high-precision five-axis linkage machining center, employing the following technical solution: A direct-drive rotary table for use in a high-precision five-axis linkage machining center includes: A-axis rotary table, used for mounting on the machine body; One end of the swing arm body is connected to the A-axis turntable; The C-axis rotary table is mounted on the swing arm body; Tail end mounting base, used for mounting on the machine body, the tail end mounting base is a ring-shaped workpiece coaxially arranged with the A-axis turntable; The tail end pivot has one end rotatably and slidably passing through the inner side of the tail end mounting base, and the other end is connected to the end of the swing arm body away from the A-axis turntable.

[0007] By adopting the above technical solution, firstly, the A-axis turntable and C-axis turntable are set up to realize the rotation of the AC axis; secondly, a tail-end floating support structure is formed between the tail-end rotating shaft and the tail-end mounting base. The turntable installation process is as follows: first, fix the A-axis turntable and the tail-end mounting base on the machine body, and at the same time, set the A-axis turntable and the tail-end mounting base coaxially. Then, hoist the swing arm body between the A-axis turntable and the tail-end mounting base, then fix the swing arm body to the A-axis turntable. Finally, move the tail-end rotating shaft over and fix it to the swing arm body to realize the installation of the turntable. In the above process, the coaxial alignment between the A-axis turntable and the tail-end mounting base is simpler than the coaxial alignment of the two ends of the swing arm body. In addition, when aligning the swing arm body and the tail-end rotating shaft, the tail-end rotating shaft can be moved away to avoid interference, so it is convenient to perform coaxial alignment work, which also facilitates the assembly of the direct drive turntable.

[0008] Preferably, a tail end bearing is provided on the inner side of the tail end mounting base, the outer ring of the tail end bearing abuts against the inner side of the tail end mounting base, and the inner ring of the tail end bearing abuts against the tail end shaft; a mounting wall is provided on the inner side of the tail end mounting base near the swing arm body, and the mounting wall abuts against the side of the tail end bearing near the swing arm body; a mounting cover is provided on the side of the tail end mounting base away from the swing arm body, and the mounting cover abuts against the side of the tail end bearing away from the swing arm body.

[0009] By adopting the above technical solution, firstly, by setting the tail end bearing, while realizing the rotational installation of the tail end shaft, the tail end bearing can also generate movement damping for the tail end shaft, thereby realizing the connection between the tail end shaft and the tail end mounting seat through a simple structure; secondly, the setting of the mounting wall and the pressure cover realizes the purpose of firmly installing the tail end bearing inside the tail end mounting seat, so as to provide sufficient sliding damping for the tail end shaft.

[0010] Preferably, the tail end bearings are arranged in multiple configurations along the axial direction of the tail end shaft.

[0011] By adopting the above technical solution, the load-bearing capacity of the tail shaft can be improved.

[0012] Preferably, the tail end pivot is divided into a through part and a connecting part. The through part is in the shape of a round shaft and is coaxially through the tail end mounting seat. The connecting part is in the shape of a flange and is connected to the swing arm body. The side of the connecting part away from the swing arm body is used to abut against the side of the tail end mounting seat close to the swing arm body.

[0013] By adopting the above technical solution, firstly, the flange-shaped connecting part facilitates the installation and fixing between the swing arm body and the connecting part; secondly, the mutual abutment between the connecting part and the tail end mounting seat limits the maximum displacement of the tail end rotating shaft moving away from the A-axis turntable, so the tail end rotating shaft will not come off from the side of the tail end mounting seat away from the A-axis turntable, thus making it easier to assemble the direct drive turntable.

[0014] Preferably, the swing arm body is provided with a C-axis mounting hole at the mounting location of the C-axis turntable; the C-axis turntable includes a C-axis motor stator, a C-axis motor rotor, and a worktable, the C-axis motor stator is fixedly mounted on the inner wall of the C-axis mounting hole; the C-axis motor rotor is rotatably mounted on the inner side of the C-axis motor stator; the worktable is connected to the C-axis motor rotor, and the worktable is used for workpiece mounting and fixing.

[0015] By adopting the above technical solution, compared with the method of using a motor in conjunction with a worm gear or roller cam to achieve the rotation of the worktable, this design method, in which the rotor is directly connected to the worktable, not only makes the structure of the C-axis turntable simpler, but also improves the positional accuracy and rotational sensitivity of the worktable.

[0016] Preferably, the worktable is divided into a table surface and a connecting shaft portion, with the table surface located outside the C-axis mounting hole; one end of the connecting shaft portion is connected to the side of the table surface near the C-axis mounting hole, and the other end of the connecting shaft portion is connected to the C-axis motor rotor; a brake pad is provided on the inner wall of the C-axis mounting hole, and the brake pad is fitted onto the connecting shaft portion, with the brake pad applying a resistance torque to the connecting shaft portion through its inner compression deformation.

[0017] By adopting the above technical solution, compared with the method of choosing a disc brake structure for the brake pads, this design method uses a ring-shaped brake pad to brake the worktable, so the overall structure of the C-axis turntable can be simpler, thereby further reducing the size of the C-axis turntable.

[0018] Preferably, a C-axis center bearing, a C-axis thrust bearing, and a mounting plate are provided between the connecting shaft and the inner wall of the C-axis mounting hole. The outer ring of the C-axis center bearing is fixedly connected to the rocker arm body, and the connecting shaft is sleeved on the inner side of the C-axis center bearing. The C-axis thrust bearing is respectively disposed on the upper and lower sides of the outer ring of the C-axis center bearing, and the C-axis thrust bearing and the C-axis center bearing form a turntable bearing. The mounting plates are respectively disposed on the lower and upper sides of the turntable bearing. The upper mounting plate is connected to the platform and the turntable bearing, and the lower mounting plate is connected to the turntable bearing.

[0019] By adopting the above technical solution, firstly, the C-axis center bearing and C-axis thrust bearing enable the connection between the worktable and the swing arm body to withstand axial and radial loads, thereby helping to improve the stability of the connection between the worktable and the swing arm body; secondly, the cooperation between the two C-axis thrust bearings and the two mounting plates can limit the offset of the worktable along the axial direction, thereby helping to improve the posture stability of the worktable during rotation.

[0020] Preferably, the outer ring of the C-axis self-centering bearing and the two mounting plates are provided with mounting bolts for fixing the turntable bearing and the mounting plates to the table surface.

[0021] By adopting the above technical solution, only bolts are needed along the axis to simultaneously fix the lower mounting plate to the turntable bearing, the upper mounting plate to the worktable, and the turntable bearing to the worktable, thereby making the connection structure between the turntable bearing and the worktable simpler.

[0022] Preferably, the swing arm body is provided with a sealing ring groove at the position in contact with the table surface. There are two sealing ring grooves with different diameters. Each sealing ring groove is provided with a sealing ring, and the sealing ring abuts against the table surface.

[0023] By adopting the above technical solution, while keeping the contact gap between the table surface and the swing arm body small, the sealing performance between the table surface and the swing arm body is improved by using a sealing ring, thereby better protecting the working components inside the C-axis rotary table.

[0024] Preferably, the sealing ring groove located further away from the center of the platform is closer to the side of the platform away from the connecting shaft.

[0025] By adopting the above technical solution, it is more difficult for external impurities to flow into the distant sealing ring groove, thereby further improving the sealing performance at the contact point between the worktable and the swing arm body.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. Firstly, the A-axis turntable and C-axis turntable are set up to realize the rotation of the AC axis; secondly, a tail-end floating support structure is formed between the tail-end rotating shaft and the tail-end mounting base. The turntable installation process is as follows: First, fix the A-axis turntable and the tail-end mounting base on the machine body. At the same time, the A-axis turntable and the tail-end mounting base are set coaxially. Then, the swing arm body is hoisted between the A-axis turntable and the tail-end mounting base. Then, the swing arm body and the A-axis turntable are fixed. Finally, the tail-end rotating shaft is moved over and fixed to the swing arm body to realize the installation of the turntable. In the above process, the coaxial alignment between the A-axis turntable and the tail-end mounting base is simpler than the coaxial alignment of the two ends of the swing arm body. In addition, when the swing arm body and the tail-end rotating shaft are aligned, the tail-end rotating shaft can be moved away to avoid interference. Therefore, it is convenient to carry out coaxial alignment work, which also facilitates the assembly of the direct drive turntable. 2. Firstly, by setting the tail end bearing, the tail end shaft can be rotated and installed, and the tail end bearing can also generate damping for the movement of the tail end shaft, thus achieving the connection between the tail end shaft and the tail end mounting base through a simple structure; secondly, the setting of the mounting wall and the pressure cover achieves the purpose of firmly installing the tail end bearing inside the tail end mounting base, so as to provide sufficient sliding damping for the tail end shaft. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the direct-drive turntable in an embodiment of this application.

[0028] Figure 2 This is a cross-sectional view of the tail end in an embodiment of this application.

[0029] Figure 3 This is a cross-sectional view of the C-axis rotary table in the embodiments of this application.

[0030] Figure 4 yes Figure 3 The enlarged view in the middle is to show the turntable bearings and the fit between the worktable and the swing arm body.

[0031] Explanation of reference numerals in the attached drawings: 1. A-axis turntable; 2. Swing arm body; 3. C-axis turntable; 31. C-axis motor stator; 32. C-axis motor rotor; 33. Worktable; 331. Table surface; 332. Connecting shaft; 4. Tail end mounting base; 41. Tail end bearing; 42. Mounting wall; 43. Mounting cover; 5. Tail end shaft; 51. Through part; 52. Connecting part; 6. Brake pad; 7. Turntable bearing; 71. C-axis center bearing; 72. C-axis thrust bearing; 8. Mounting clamp; 81. Mounting bolt; 9. Sealing ring groove; 91. Sealing ring. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1-4This application will be described in further detail.

[0033] This application discloses a direct-drive rotary table applied to a high-precision five-axis linkage machining center. (Refer to...) Figure 1 and Figure 2 The direct-drive turntable includes an A-axis turntable 1, a swing arm body 2, a C-axis turntable 3, a tail-end mounting base 4, and a tail-end rotating shaft 5. The A-axis turntable 1 is fixedly mounted on the machine body and rotates around the X-axis. One end of the swing arm body 2 is coaxially connected to the rotating part of the A-axis turntable 1. The C-axis turntable 3 is mounted at the middle of the length of the swing arm body 2. The tail-end mounting base 4 is fixedly mounted on the frame and is coaxially arranged with the A-axis turntable 1. The tail-end mounting base 4 has a ring-shaped structure. One end of the tail-end rotating shaft 5 rotates and slides through the inner side of the tail-end mounting base 4, and the other end is fixedly connected to the end of the swing arm body 2 away from the A-axis turntable 1.

[0034] Reference Figure 1 and Figure 2 The turntable installation process is as follows: First, fix the A-axis turntable 1 and the tail mounting base 4 onto the machine body, ensuring that the A-axis turntable 1 and the tail mounting base 4 are coaxial. Next, hoist the swing arm body 2 between the A-axis turntable 1 and the tail mounting base 4, then fix the swing arm body 2 to the A-axis turntable 1. Finally, move the tail shaft 5 over and fix it to the swing arm body 2, thus completing the turntable installation. In the above process, firstly, the coaxial alignment between the A-axis turntable 1 and the tail mounting base 4 is simpler than the coaxial alignment of the two ends of the swing arm body 2; secondly, when aligning the swing arm body 2 and the tail shaft 5, the tail shaft 5 can be moved away to avoid interference. In summary, this facilitates coaxial alignment, which in turn facilitates the assembly of the direct drive turntable.

[0035] Reference Figure 1 and Figure 2 To achieve the connection between the tail end shaft 5 and the tail end mounting base 4, the following configuration is provided: a tail end bearing 41 is installed on the inner side of the tail end mounting base 4. There are two tail end bearings 41, which are arranged along the axial direction of the tail end shaft 5. The inner ring of the tail end bearing 41 abuts against the outer wall of the tail end shaft 5, and the outer ring of the tail end bearing 41 abuts against the inner wall of the tail end mounting base 4. In order to install the tail end bearing 41, an integral mounting wall 42 is formed on the inner side of the tail end mounting base 4 near the swing arm body 2. The mounting wall 42 abuts against the side of the tail end bearing 41 near the swing arm body 2. An mounting cover 43 is fixed to the side of the tail end mounting base 4 away from the swing arm body 2 by bolts. The mounting cover 43 abuts against the side of the tail end bearing 41 away from the swing arm body 2, thereby achieving a stable installation of the tail end bearing 41.

[0036] Reference Figure 1 and Figure 2In order to limit the maximum travel of the tail shaft 5 away from the A-axis turntable 1, the tail shaft 5 is divided into a through part 51 and a connecting part 52. The through part 51 is in the shape of a round shaft and is coaxially mounted on the tail mounting seat 4. The connecting part 52 is a flange structure and is fixedly connected to the swing arm body 2. The side of the connecting part 52 away from the swing arm body 2 will abut against the side of the tail mounting seat 4 near the swing arm body 2. At this time, the tail shaft 5 can no longer move away from the A-axis turntable 1, so the tail shaft 5 will not come off the side of the tail mounting seat 4 away from the A-axis turntable 1, which makes it easier to perform the assembly work of the direct drive turntable.

[0037] Reference Figure 1 and Figure 3 To simplify and compress the structure of the direct-drive rotary table, and to improve its positioning accuracy and rotational sensitivity, the driving principles of the A-axis rotary table 1 and the C-axis rotary table 3 are modified. Since the driving principles of the A-axis rotary table 1 and the C-axis rotary table 3 are identical, only the C-axis rotary table 3 will be described in detail below. Specifically, the swing arm body 2 has a C-axis mounting hole at the C-axis rotary table 3. The C-axis rotary table 3 includes a C-axis motor stator 31, a C-axis motor rotor 32, and a worktable 33. The C-axis motor stator 31 is fixedly mounted on the inner wall of the C-axis mounting hole. The C-axis motor rotor 32 is rotatably positioned inside the C-axis motor stator 31. The worktable 33 is connected to the C-axis motor rotor 32, and the worktable 33 allows for the fixed mounting of the workpiece. In summary, the motor rotor is directly connected to the worktable 33, thus simplifying the structure of the C-axis rotary table 3 and improving the positioning accuracy and rotational sensitivity of the worktable 33.

[0038] Reference Figure 3 and Figure 4 To enable the worktable 33 to brake quickly, a braking mechanism is required. However, the braking mechanism needs to directly cooperate with the worktable 33, so the following configuration is provided: The worktable 33 is divided into a table surface 331 and a connecting shaft 332. The table surface 331 is cylindrical and located outside the C-axis mounting hole. The workpiece is also fixed on the table surface 331. The connecting shaft 332 is cylindrical. One end of the connecting shaft 332 is coaxially fixedly connected to the side of the table surface 331 near the C-axis mounting hole, and the other end is connected to the C-axis motor rotor 32. At the same time, a brake pad 6 is fixedly installed on the inner wall of the C-axis mounting hole. The brake pad 6 is wrapped around the connecting shaft 332. The inner side of the brake pad 6 abuts against the connecting shaft 332 in a compressed deformation state to apply a resistance torque to the worktable 33.

[0039] In other embodiments, if structural simplicity is not a concern, the brake pad 6 can also be constructed as a disc brake.

[0040] Reference Figure 3 and Figure 4 There is a bearing structure between the swing arm body 2 and the worktable 33. In order to improve the connection stability between the worktable 33 and the swing arm body 2, the specific structure is as follows: a C-axis center bearing 71, a C-axis thrust bearing 72 and a mounting plate 8 are provided between the connecting shaft part 332 and the inner wall of the C-axis mounting hole. The outer ring of the C-axis center bearing 71 is fixedly connected to the structure of the swing arm body 2 at the inner wall of the C-axis mounting hole. The inner ring of the C-axis center bearing 71 is sleeved on the connecting shaft part 332. There are two C-axis thrust bearings 72. The two C-axis thrust bearings 72 are respectively set on the upper side and the lower side of the outer ring of the C-axis center bearing 71. At this time, the composite structure of the C-axis thrust bearing 72 and the C-axis center bearing 71 will serve as a turntable bearing 7.

[0041] Reference Figure 3 and Figure 4 Two mounting plates 8 are also provided, which are respectively installed on the upper and lower sides of the turntable bearing 7. At the same time, a mounting bolt 81 is also provided. The mounting bolt 81 passes through the lower mounting plate 8, the inner ring of the C-axis thrust bearing 71 and the upper mounting plate 8 in sequence, and is finally fixed on the table surface 331. The turntable bearing 7 is installed and fixed through a simple structure, so that the connection between the worktable 33 and the swing arm body 2 can withstand axial load and radial load. At the same time, the axial displacement of the worktable 33 can be limited by the two C-axis thrust bearings 72.

[0042] In other embodiments, if there is insufficient internal space, crossed roller bearings can be installed to withstand axial and radial loads.

[0043] Reference Figure 3 and Figure 4 To improve the sealing performance at the contact point between the worktable 331 and the swing arm body 2, a sealing ring groove 9 is provided at the contact point between the swing arm body 2 and the worktable 331. Two sealing ring grooves 9 are provided, and the two sealing ring grooves 9 are coaxially arranged with the worktable 331 as the center. The diameters of the two sealing ring grooves 9 are different. At the same time, a sealing ring 91 is provided in each sealing ring groove 9. The sealing ring 91 abuts against the worktable 331, so the sealing performance at the contact point can be improved by means of the sealing ring 91. In addition, the sealing ring groove 9 located further away from the center of the worktable 331 is closer to the upper side of the worktable 331, which makes it more difficult for external impurities to enter the sealing ring groove 9, thereby further improving the sealing performance at the contact point between the worktable 33 and the swing arm body 2.

[0044] The implementation principle of a direct-drive rotary table applied to a high-precision five-axis linkage machining center according to an embodiment of this application is as follows: The rotary table installation process is as follows: First, fix the A-axis rotary table 1 and the tail end mounting base 4 on the machine body. At the same time, the A-axis rotary table 1 and the tail end mounting base 4 need to be coaxially set. Then, the swing arm body 2 is hoisted between the A-axis rotary table 1 and the tail end mounting base 4. Then, the swing arm body 2 and the A-axis rotary table 1 are fixed. Finally, the tail end rotating shaft 5 is moved over and fixed to the swing arm body 2, thus completing the installation of the rotary table. In the above process, firstly, the coaxial alignment between the A-axis rotary table 1 and the tail end mounting base 4 is simpler than the coaxial alignment of the two ends of the swing arm body 2. Secondly, when the swing arm body 2 and the tail end rotating shaft 5 are aligned, the tail end rotating shaft 5 can be moved away to avoid interference. In summary, it is convenient to perform coaxial alignment work, which also facilitates the assembly work of the direct-drive rotary table.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A direct-drive rotary table for use in a high-precision five-axis linkage machining center, characterized in that: include: A-axis rotary table (1), used for mounting on the machine body; The swing arm body (2) is connected at one end to the A-axis turntable (1); The C-axis turntable (3) is mounted on the swing arm body (2); Tail end mounting base (4) is used to be mounted on the machine body. The tail end mounting base (4) is a ring-shaped workpiece coaxially arranged with the A-axis turntable (1). The tail end pivot (5) has one end rotating and damping sliding through the inner side of the tail end mounting base (4), and the other end is connected to the end of the swing arm body (2) away from the A-axis turntable (1). The tail end rotating shaft (5) and the tail end mounting seat (4) cooperate to form a tail end floating support structure, so that during assembly, the tail end rotating shaft (5) can move axially within the tail end mounting seat (4) to achieve convenient alignment and connection with the swing arm body (2). A tail end bearing (41) is provided on the inner side of the tail end mounting base (4). The outer ring of the tail end bearing (41) abuts against the inner side of the tail end mounting base (4), and the inner ring of the tail end bearing (41) abuts against the tail end rotating shaft (5). A mounting wall (42) is provided on the inner side of the tail end mounting base (4) near the swing arm body (2). The mounting wall (42) abuts against the side of the tail end bearing (41) near the swing arm body (2). A mounting cover (43) is provided on the side of the tail end mounting base (4) away from the swing arm body (2). The mounting cover (43) abuts against the side of the tail end bearing (41) away from the swing arm body (2). Multiple tail end bearings (41) are arranged along the axial direction of the tail end shaft (5); The tail end pivot (5) is divided into a through part (51) and a connecting part (52). The through part (51) is in the shape of a round shaft and is coaxially mounted on the tail end mounting seat (4). The connecting part (52) is in the shape of a flange and is connected to the swing arm body (2). The side of the connecting part (52) away from the swing arm body (2) is used to abut against the side of the tail end mounting seat (4) close to the swing arm body (2).

2. The direct-drive rotary table applied to a high-precision five-axis linkage machining center according to claim 1, characterized in that: The swing arm body (2) has a C-axis mounting hole at the mounting location of the C-axis turntable (3); the C-axis turntable (3) includes a C-axis motor stator (31), a C-axis motor rotor (32) and a worktable (33), the C-axis motor stator (31) is fixedly mounted on the inner wall of the C-axis mounting hole; the C-axis motor rotor (32) is rotatably mounted on the inner side of the C-axis motor stator (31); the worktable (33) is connected to the C-axis motor rotor (32), and the worktable (33) is used for workpiece mounting and fixing.

3. The direct-drive rotary table applied to a high-precision five-axis linkage machining center according to claim 2, characterized in that: The worktable (33) is divided into a table surface (331) and a connecting shaft part (332). The table surface (331) is located outside the C-axis mounting hole. One end of the connecting shaft part (332) is connected to the side of the table surface (331) near the C-axis mounting hole, and the other end of the connecting shaft part (332) is connected to the C-axis motor rotor (32). A brake pad (6) is provided on the inner wall of the C-axis mounting hole. The brake pad (6) is fitted onto the connecting shaft part (332). The brake pad (6) applies a resistance torque to the connecting shaft part (332) through the compression deformation on the inner side.

4. The direct-drive rotary table applied to a high-precision five-axis linkage machining center according to claim 3, characterized in that: A C-axis center bearing (71), a C-axis thrust bearing (72), and a mounting plate (8) are provided between the connecting shaft part (332) and the inner wall of the C-axis mounting hole. The outer ring of the C-axis center bearing (71) is fixedly connected to the swing arm body (2), and the connecting shaft part (332) is sleeved on the inner side of the C-axis center bearing (71). The C-axis thrust bearing (72) is respectively disposed on the upper and lower sides of the outer ring of the C-axis center bearing (71), and the C-axis thrust bearing (72) and the C-axis center bearing (71) form a turntable bearing (7). The mounting plate (8) is respectively disposed on the lower and upper sides of the turntable bearing (7). The upper mounting plate (8) is connected to the platform part (331) and the turntable bearing (7), and the lower mounting plate (8) is connected to the turntable bearing (7).

5. The direct-drive rotary table applied to a high-precision five-axis linkage machining center according to claim 4, characterized in that: The outer ring of the C-axis self-centering bearing (71) and the two mounting plates (8) are provided with mounting bolts (81) for fixing the turntable bearing (7) and the mounting plates (8) on the table surface (331).

6. The direct-drive rotary table applied to a high-precision five-axis linkage machining center according to claim 3, characterized in that: The swing arm body (2) is provided with a sealing ring groove (9) at the position that contacts the table surface (331). There are two sealing ring grooves (9) with different diameters. Each sealing ring groove (9) is provided with a sealing ring (91) and the sealing ring (91) abuts against the table surface (331).

7. The direct-drive rotary table applied to a high-precision five-axis linkage machining center according to claim 6, characterized in that: The sealing ring groove (9), which is located further away from the center of the platform (331), is closer to the side of the platform (331) away from the connecting shaft (332).

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