High-torque high-rigidity waterwheel type special numerical control rotary table

Abstract

The utility model belongs to the technical field of numerical control machine tools, and particularly relates to a high-torque high-rigidity waterwheel type special numerical control rotary table which comprises a shell, a rotary table main shaft is connected in the shell in a rotating and sliding mode, a planetary speed reducer is installed on the shell, and a servo motor is installed on the planetary speed reducer. The output end of the servo motor is connected with the input end of the planetary speed reducer, one end of the cross recess coupler is installed at the output end of the planetary speed reducer, the rotary table main shaft is installed at the other end of the cross recess coupler, and the rotary table face used for bearing workpieces is installed on the rotary table main shaft. When external force is transmitted to the servo motor mandrel, the servo motor mandrel can rotate randomly, so that any parts in the whole mechanism cannot be damaged, and further, the mechanism is simple and convenient to mount, high in rotating speed, long in service life, stable in rotation and more convenient to operate, and the manufacturing cost and the use space are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of numerical control machine tools, and in particular relates to a high-torque and high-rigidity waterwheel type special numerical control turntable. Background Art

[0002] The servo turntables widely used nowadays are basically worm gear structures. The servo motor 4 is used to drive the worm to rotate, thereby driving the worm wheel to rotate, and then achieving the purpose of driving the turntable to rotate. However, in the worm gear mechanism, the worm is made of alloy steel, which is harder; the worm wheel is made of aluminum bronze, which is softer. After a period of use, the worm wheel will wear out, resulting in excessive reverse clearance between the worm gear and the worm, which needs to be readjusted, increasing the user's extra workload.

[0003] Secondly, since the worm gear itself has a self-locking function, if the origin position is not set accurately, when the positioning gear is locked, the worm gear will squeeze the worm, causing damage to the copper worm gear, and in severe cases, the mechanism will fail. To accurately set the origin position, mechanical and electrical personnel must cooperate, and the whole process is very complicated, and it is difficult for ordinary users to complete it accurately.

[0004] Finally, the existing turntable with a worm gear structure has a locking and positioning mechanism using a three-piece planar clutch tooth, which is locked and released by piston movement. Since the three-piece planar clutch tooth is composed of three teeth, it will affect the locking time to a certain extent. At the same time, high-end customers at this stage have very strict requirements on the production rhythm, and the control of the rotation speed time and the locking and release time is accurate to milliseconds. Therefore, this structure cannot meet the production rhythm of high-end customers. Utility Model Content

[0005] In order to solve the above technical problems, the utility model further proposes a high-torque and high-rigidity waterwheel type special CNC turntable.

[0006] The specific technical scheme of the utility model is as follows: a high-torque and high-rigidity waterwheel-type special-purpose CNC turntable, comprising a shell, in which a turntable spindle is rotatably and slidably connected, a planetary reducer is installed on the shell, a servo motor is installed on the planetary reducer, the output end of the servo motor is connected to the input end of the planetary reducer, one end of a cross groove coupling is installed on the output end of the planetary reducer, the turntable spindle is installed on the other end of the cross groove coupling, a turntable disk for carrying a workpiece is installed on the turntable spindle, a locking assembly for limiting the rotation of the turntable spindle is installed on the turntable disk, and a driving assembly for driving the locking assembly to move and lock the turntable spindle is slidably connected in the shell.

[0007] Furthermore, the locking assembly includes a first clutch gear ring and a second clutch gear ring. The first clutch gear ring is installed on the turntable surface, and the second clutch gear ring is installed on the shell. The first clutch gear ring and the second clutch gear ring are engaged to limit and lock the turntable surface.

[0008] Furthermore, the drive assembly includes a cylinder body, a cylinder body is installed in the shell, a first piston is slidably connected in the cylinder body, a second piston is installed on the first piston, a first oil port for injecting oil to drive the first piston to move is opened on the shell, a second oil port for injecting oil to drive the second piston to move is opened on the shell, a bearing is rotatably connected to the turntable main shaft, a first limit ring is installed on the turntable main shaft, and the bearing is placed between the first limit ring and the first piston.

[0009] Furthermore, the driving assembly also includes a second limiting ring, the second limiting ring is installed on the turntable main shaft, and the second limiting ring is in contact with the second piston.

[0010] Furthermore, an end cover for positioning the turntable surface is installed on the shell.

[0011] Furthermore, a positioning sleeve for positioning the turntable spindle is installed on the housing.

[0012] Furthermore, a first sealing ring is installed on the end cover to enhance the sealing performance with the turntable disk surface.

[0013] Furthermore, a second sealing ring is installed on the positioning sleeve to enhance the sealing performance between the positioning sleeve and the main shaft of the turntable.

[0014] Beneficial effects:

[0015] The present application has a turntable spindle that rotates and slides in a shell, a planetary reducer is installed on the shell, a servo motor is installed on the planetary reducer, the output end of the servo motor is connected to the input end of the planetary reducer, one end of a cross groove coupling is installed on the output end of the planetary reducer, and the turntable spindle is installed on the other end of the cross groove coupling, a turntable disk for carrying a workpiece is installed on the turntable spindle, a locking assembly for limiting the rotation of the turntable spindle is installed on the turntable disk, a driving assembly for driving the locking assembly to move and lock the turntable spindle is slidably connected in the shell, the cross groove coupling drives the turntable spindle to rotate through a cross keyway structure, the servo motor output end is connected to the planetary reducer input end through a clamping ring coupling, and the inside of the planetary reducer is Gear transmission, because the gear surface has been heat treated, the hardness is very high, the wear after long-term use is very small, and a reasonable gap can still be maintained. Even after a period of high-frequency use, there is no need to manually adjust the gap between the various transmission parts. Compared with the worm gear structure of equivalent size, the planetary reducer can withstand higher rotational inertia and speed. The rotational inertia that the planetary reducer can withstand is much larger than that of the worm gear structure, which is more than twice that of the worm gear structure of equivalent size. In terms of speed, the maximum speed of the servo motor driving the worm gear structure is mostly 2000rpm, while the maximum speed of the servo motor driving the planetary reducer is mostly 4000rpm, or even higher. The rotation centerline of the servo motor coincides with the rotation centerline of the turntable spindle, and will not occupy the position of the machine tool power head. For the existing turntable with a worm gear structure, the servo motor is basically located in a corner on the back of the turntable, and it is slightly protruding, which will occupy the position of a power head of the multi-station combination machine tool, causing certain troubles to the design layout of the machine tool. In order to prevent the power head from interfering with the turntable, the rotation diameter of the fixture disk is forced to be increased, which in turn causes the overall size of the machine tool to become larger, making the overall rigidity of the machine tool worse and the manufacturing cost higher. In this CNC turntable structure, the rotation centerline of the servo motor coincides with the rotation centerline of the turntable spindle, and the servo motor is located at the last section of the whole mechanism, far away from the processing part of the machine tool, and will not occupy the position of the machine tool power head. The fixture disk of the machine tool does not need to consider the problem of avoiding the turntable servo motor, and the overall size of the machine tool can be reduced accordingly, thereby achieving the effect of reducing the manufacturing cost of the machine tool. When locking the turntable disk, the drive assembly is used to drive the turntable spindle downward, so that the turntable spindle drives the locking assembly on the turntable disk to move downward, so that the locking assembly locks the turntable disk. When the turntable is driven by a worm gear structure, when the deviation is corrected, the worm gear will also rotate a very small angle together with the turntable disk. However, since the worm gear mechanism has a self-locking function, when the worm gear rotates, the worm cannot be driven to rotate. If the angle of rotation of the worm wheel exceeds the gap between the worm gear and the worm, a squeezing action will occur, causing irreversible damage to the copper worm wheel.In this CNC turntable mechanism, since there is a rigid connection from the turntable disk to the output end of the planetary reducer, when the turntable disk is driven to rotate by the first clutch gear ring, it will also drive the output end of the planetary reducer to rotate at the same time. However, the planetary reducer does not have a self-locking function. This force will be transmitted to the servo motor, and the servo motor can be powered off when it does not need to rotate. When external force is transmitted to the servo motor core shaft, it can rotate arbitrarily, and will not cause damage to any parts in the entire mechanism. Therefore, it is easy to install, has a fast rotation speed, a long service life, a smoother rotation, and a more convenient operation, reducing manufacturing costs and usage space. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 It is a cross-sectional schematic diagram of the utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the drive assembly of the utility model;

[0019] Figure 4 This is a schematic diagram of the locking assembly structure of the utility model.

[0020] Description of the markings in the figure:

[0021] Housing 1, turntable spindle 2, planetary reducer 3, servo motor 4, cross groove coupling 5, turntable disk 6, locking assembly 7, first clutch gear ring 71, second clutch gear ring 72, drive assembly 8, cylinder body 81, first piston 82, second piston 83, first oil port 84, second oil port 85, bearing 86, first limit ring 87, second limit ring 88, end cover 9, positioning sleeve 10, second sealing ring 12, first sealing ring 11. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limitations on the present invention.

[0024] Example 1: Combination Figures 1 to 3A high-torque and high-rigidity waterwheel-type special CNC turntable is described, including a shell 1, in which a turntable spindle 2 is rotatably and slidably connected, a planetary reducer 3 is installed on the shell 1, a servo motor 4 is installed on the planetary reducer 3, the output end of the servo motor 4 is connected to the input end of the planetary reducer 3, one end of a cross groove coupling 5 is installed on the output end of the planetary reducer 3, the turntable spindle 2 is installed on the other end of the cross groove coupling 5, a turntable disk 6 for carrying a workpiece is installed on the turntable spindle 2, a locking assembly 7 for limiting the rotation of the turntable spindle 2 is installed on the turntable disk 6, and a driving assembly 8 for driving the locking assembly 7 to move and lock the turntable spindle 2 is slidably connected in the shell 1. The present application comprises a turntable spindle 2 which is rotatably and slidably connected in a shell 1, a planetary reducer 3 is installed on the shell 1, a servo motor 4 is installed on the planetary reducer 3, an output end of the servo motor 4 is connected to an input end of the planetary reducer 3, one end of a cross groove coupling 5 is installed on the output end of the planetary reducer 3, a turntable spindle 2 is installed on the other end of the cross groove coupling 5, a turntable disk 6 for carrying a workpiece is installed on the turntable spindle 2, a locking assembly 7 for limiting the rotation of the turntable spindle 2 is installed on the turntable disk 6, a driving assembly 8 for driving the locking assembly 7 to move and lock the turntable spindle 2 is slidably connected in the shell 1, the cross groove coupling 5 drives the turntable spindle 2 to rotate through a cross keyway structure, and the output end of the servo motor 4 is connected to the input end of the planetary reducer 3 through a clamping ring coupling. The planetary reducer 3 is internally driven by a gear set. Since the gear surface has been heat treated, the hardness is very high, and the wear after long-term use is very small, and a reasonable gap can still be maintained. Even after a period of high-frequency use, there is no need to manually adjust the gap between the various transmission parts. Compared with the worm gear structure of equivalent volume, the planetary reducer 3 can withstand higher rotational inertia and rotation speed. The rotational inertia that the planetary reducer 3 can withstand is much greater than that of the worm gear structure, which is more than twice that of the worm gear structure of equivalent volume. In terms of rotation speed, the maximum rotation speed of the servo motor driving the worm gear structure is mostly 2000rpm, while the maximum rotation speed of the servo motor driving the planetary reducer is mostly 4000rpm, or even higher. The rotation centerline of the servo motor 4 coincides with the rotation centerline of the turntable spindle 2, and will not occupy the position of the machine tool power head. For the turntable of the existing worm gear structure, the position of the servo motor 4 is basically in a corner of the back of the turntable, and it is slightly protruding, which will occupy the position of a power head of the multi-station combination machine tool, causing certain troubles to the design layout of the machine tool. In order to prevent the power head from interfering with the turntable, the rotation diameter of the fixture disk is forced to be increased, which in turn leads to an increase in the overall size of the machine tool, which makes the overall rigidity of the machine tool worse and the manufacturing cost higher. In this CNC turntable structure, the rotation centerline of the servo motor 4 coincides with the rotation centerline of the turntable spindle 2, and the servo motor 4 is located at the last section of the whole mechanism, away from the processing part of the machine tool, and will not occupy the position of the machine tool power head.The fixture plate of the machine tool does not need to consider the problem of avoiding the turntable servo motor 4, and the overall size of the machine tool can be reduced accordingly, thereby achieving the effect of reducing the manufacturing cost of the machine tool. When locking the turntable disk 6, the drive component 8 is used to drive the turntable spindle 2 to move downward, so that the turntable spindle 2 drives the locking component 7 on the turntable disk 6 to move downward, so that the locking component 7 locks the turntable disk 6. When the turntable is driven by a worm gear structure, when the deviation is corrected, the worm wheel will also rotate a very small angle together with the turntable disk. However, since the worm gear mechanism has a self-locking function, when the worm wheel rotates, the worm cannot be driven to rotate. If the angle of rotation of the worm wheel exceeds the gap between the worm wheel and the worm, an extrusion action will occur, which will cause irreversible damage to the copper worm wheel. In the present CNC turntable mechanism, since the turntable disc 6 is rigidly connected to the output end of the planetary reducer 3, when the turntable disc 6 is driven to rotate by the first clutch gear ring 71, the output end of the planetary reducer 3 will also be driven to rotate at the same time, but the planetary reducer 3 does not have a self-locking function, and this force will be transmitted to the servo motor 4. The servo motor 4 can be powered off when it does not need to rotate. When external force is transmitted to the core shaft of the servo motor 4, it can rotate arbitrarily, and will not cause damage to any parts in the entire mechanism. Therefore, it is easy to install, has a fast rotation speed, a long service life, a smoother rotation, and a more convenient operation, reducing manufacturing costs and usage space.

[0025] Example 2: Based on Example 1, Figure 3 and Figure 4 To explain, the locking assembly 7 includes a first clutch gear ring 71 and a second clutch gear ring 72. The first clutch gear ring 71 is installed on the turntable disk 6, and the second clutch gear ring 72 is installed on the housing 1. The first clutch gear ring 71 and the second clutch gear ring 72 are engaged to limit and lock the turntable disk 6. In this application, the first clutch gear ring 71 is installed on the turntable disk 6, and the second clutch gear ring 72 is installed on the housing 1. The first clutch gear ring 71 and the second clutch gear ring 72 are engaged to limit and lock the turntable disk 6. Since the planetary reducer 3 does not have a self-locking function. If the position of the turntable disk 6 after the rotation stops has a certain deviation from the actual position to be positioned, the deviation can be corrected by the meshing action of the first clutch gear ring 71 and the second clutch gear ring 72 to achieve the purpose of precise positioning, so that the structure is simpler, the installation is convenient, the locking and releasing time is shortened, the contact area between the teeth is increased, and the locking torque and positioning accuracy are improved.

[0026] Embodiment 3: Based on Embodiment 1, Figure 3 and Figure 4For explanation, the driving assembly 8 includes a cylinder body 81, the cylinder body 81 is installed in the shell 1, a first piston 82 is slidably connected in the cylinder body 81, a second piston 83 is installed on the first piston 82, a first oil port 84 for oil injection to drive the first piston 82 to move is opened on the shell 1, a second oil port 85 for oil injection to drive the second piston 83 to move is opened on the shell 1, a bearing 86 is rotatably connected to the turntable main shaft 2, a first limit ring 87 is installed on the turntable main shaft 2, and the bearing 86 is placed between the first limit ring 87 and the first piston 82. The present application comprises a cylinder body 81 installed in a housing 1, a first piston 82 is slidably connected in the cylinder body 81, a second piston 83 is installed on the first piston 82, a first oil port 84 for injecting oil to drive the first piston 82 to move is provided on the housing 1, a second oil port 85 for injecting oil to drive the second piston 83 to move is provided on the housing 1, a bearing 86 is rotatably connected to the turntable main shaft 2, a first limiting ring 87 is installed on the turntable main shaft 2, and the bearing 86 is placed between the first limiting ring 87 and the first piston 82. By injecting oil into the first oil port 84, the hydraulic oil pushes the first limiting ring 87 upward through the first piston 82, so that the first limiting ring 87 moves upward. The ring 87 drives the turntable main shaft 2 to move upward. Since the turntable main shaft 2 is installed at the other end of the cross groove coupling 5, the rotational force output by the servo motor 4 can be transmitted to the turntable main shaft 2 moving up and down through the cross groove coupling 5, so that the first clutch gear ring 71 is separated from the second clutch gear ring 72. Then, the turntable main shaft 2 drives the turntable disk 6 to rotate, and then when the first clutch gear ring 71 is separated from the second clutch gear ring 72, the operation is more stable. Even if a workpiece is placed on the turntable disk 6, the first clutch gear ring 71 can be separated from the second clutch gear ring 72 by injecting oil into the first oil port 84, thereby ensuring smooth operation and shortening the release time.

[0027] Embodiment 4: Based on Embodiment 3, Figure 4 For explanation, the driving assembly 8 also includes a second limiting ring 88, and the second limiting ring 88 is installed on the turntable main shaft 2, and the second limiting ring 88 is in contact with the second piston 83. In this application, the second limiting ring 88 is installed on the turntable main shaft 2, and the second limiting ring 88 is in contact with the second piston 83, and hydraulic oil is injected into the second oil port 85, and the hydraulic oil driving the first piston 82 to move is sucked out by the first oil port 84, so that the injected hydraulic oil pushes the second piston 83 to move downward, and the second piston 83 drives the turntable main shaft 2 to move downward through the second limiting ring 88, so that the turntable main shaft 2 drives the turntable disk 6 to move downward, and the turntable disk 6 drives the first clutch gear ring 71 to mesh with the second clutch gear ring 72, thereby locking the turntable disk 6, shortening the locking time, making the locking more stable, and improving the locking torque and positioning accuracy.

[0028] Example 5: Based on Example 1, Figure 3For explanation, the housing 1 is provided with an end cap 9 for positioning the turntable disc 6. The present application installs an end cap 9 for positioning the turntable disc 6 on the housing 1, and the turntable disc 6 is positioned by the end cap 9, which can also increase the sealing between the turntable disc 6 and the housing 1 and extend the service life.

[0029] Example 6: Based on Example 1, Figure 4 For explanation, the housing 1 is provided with a positioning sleeve 10 for positioning the turntable spindle 2. The present application installs a positioning sleeve 10 for positioning the turntable spindle 2 on the housing 1, and the positioning sleeve 10 facilitates the installation of the turntable spindle 2 and the servo motor 4 on the same rotation center line, thereby facilitating the installation of the turntable spindle 2 in the housing 1, thereby improving the stability during rotation.

[0030] Example 7: Based on Example 5, Figure 3 For explanation, the end cover 9 is provided with a first sealing ring 11 for enhancing the sealing with the turntable disk 6. The present application increases the sealing between the turntable disk 6 and the housing 1 by installing a first sealing ring 11 for enhancing the sealing with the turntable disk 6 on the end cover 9, and lubricating oil can be injected into the gap to extend the service life.

[0031] Embodiment 8: Based on Embodiment 6, Figure 4 For explanation, the positioning sleeve 10 is equipped with a second sealing ring 12 for enhancing the sealing between the positioning sleeve 10 and the turntable main shaft 2. The present application increases the sealing between the positioning sleeve 10 and the turntable main shaft 2 by installing a second sealing ring 12 on the positioning sleeve 10 for enhancing the sealing between the positioning sleeve 10 and the turntable main shaft 2, and lubricating oil can be injected into the gap to extend the service life.

[0032] Working process:

[0033] When the turntable disk 6 is locked, hydraulic oil is injected into the second oil port 85, so that the hydraulic oil pushes the second piston 83 to move downward, and the second piston 83 drives the turntable main shaft 2 to move downward through the second limit ring 88, and the turntable main shaft 2 drives the turntable disk 6 to move downward, so that the turntable disk 6 drives the first clutch gear ring 71 to engage and lock with the second clutch gear ring 72 on the housing 1. When releasing, hydraulic oil is injected into the first oil port 84, and the hydraulic oil that pushes the second piston 83 is sucked out through the second oil port 85, so that the first piston 82 drives the turntable main shaft 2 to rise through the first limit ring 87, and the turntable main shaft 2 drives the first clutch gear ring 71 to separate from the second clutch gear ring 72 through the turntable disk 6, and the lock of the turntable disk 6 is released, thereby simple installation, fast rotation speed, long service life, smoother rotation, more convenient operation, and reduced manufacturing cost and usage space.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0035] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A high torque and high rigidity waterwheel type special CNC turntable, characterized by: The invention comprises a housing (1), a turntable main shaft (2) is rotatably and slidably connected in the housing (1), a planetary reducer (3) is mounted on the housing (1), a servo motor (4) is mounted on the planetary reducer (3), an output end of the servo motor (4) is connected to an input end of the planetary reducer (3), one end of a cross-groove coupling (5) is mounted on the output end of the planetary reducer (3), a turntable main shaft (2) is mounted on the other end of the cross-groove coupling (5), a turntable disk (6) for carrying a workpiece is mounted on the turntable main shaft (2), a locking assembly (7) for limiting the rotation of the turntable main shaft (2) is mounted on the turntable disk (6), and a driving assembly (8) for driving the locking assembly (7) to move and lock the turntable main shaft (2) is slidably connected in the housing (1).

2. The high-torque and high-rigidity waterwheel-type special CNC turntable according to claim 1 is characterized in that: The locking assembly (7) comprises a first clutch toothed ring (71) and a second clutch toothed ring (72); the first clutch toothed ring (71) is mounted on the turntable disk (6), and the second clutch toothed ring (72) is mounted on the housing (1); the first clutch toothed ring (71) and the second clutch toothed ring (72) are meshed to limit and lock the turntable disk (6).

3. The high-torque and high-rigidity waterwheel-type special CNC turntable according to claim 1 is characterized in that: The driving assembly (8) comprises a cylinder body (81), the housing (1) is provided with the cylinder body (81), a first piston (82) is slidably connected in the cylinder body (81), a second piston (83) is installed on the first piston (82), a first oil port (84) for injecting oil to drive the first piston (82) to move is provided on the housing (1), a second oil port (85) for injecting oil to drive the second piston (83) to move is provided on the housing (1), a bearing (86) is rotatably connected to the turntable main shaft (2), a first limiting ring (87) is installed on the turntable main shaft (2), and the bearing (86) is placed between the first limiting ring (87) and the first piston (82).

4. The high-torque and high-rigidity waterwheel-type special CNC turntable according to claim 3 is characterized in that: The driving assembly (8) further comprises a second limiting ring (88), the second limiting ring (88) being mounted on the turntable main shaft (2), and the second limiting ring (88) being in contact with the second piston (83).

5. The high-torque and high-rigidity waterwheel-type special CNC turntable according to claim 1 is characterized in that: An end cover (9) for positioning the turntable disc (6) is installed on the housing (1).

6. The high-torque and high-rigidity waterwheel-type special CNC turntable according to claim 1 is characterized in that: A positioning sleeve (10) for positioning the turntable main shaft (2) is installed on the housing (1).

7. The high-torque and high-rigidity waterwheel-type special CNC turntable according to claim 5 is characterized in that: The end cover (9) is provided with a first sealing ring (11) for enhancing the sealing performance with the turntable disc surface (6).

8. The high-torque and high-rigidity waterwheel-type special CNC turntable according to claim 6 is characterized in that: The positioning sleeve (10) is provided with a second sealing ring (12) for enhancing the sealing performance between the positioning sleeve (10) and the turntable main shaft (2).

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