Numerical control rotary table for drilling and milling machine

Abstract

The present application relates to the field of numerical control rotary table, especially to a numerical control rotary table for drilling and milling machine tool, comprising a machine body; a rotary table is installed in the middle of the machine body through the main shaft rotation, the rotary table is used for carrying the flange pipe to be processed; further comprising a positioning module arranged between the rotary table and the machine body, the positioning module comprises, a centering and clamping assembly, the centering and clamping assembly is used for folding along the radial direction of the rotary table, the radial centering and clamping of the flange pipe are carried out, and the axial lifting of the edge of the flange pipe is provided; the clamping reference of the centering and clamping assembly is matched with the lifting height of the follow-up lifting assembly, so as to constitute the multi-stage integrated clamping of lifting, locking and clamping under single power; a follow-up lifting assembly, the follow-up lifting assembly is used for axially lifting the flange plate, so that the drilling avoidance gap is formed between the flange plate and the rotary table surface; a control assembly, the control assembly is used for synchronously outputting power to the centering and clamping assembly and the follow-up lifting assembly.

Description

Technical Field

[0001] This invention relates to the field of CNC rotary tables, and in particular to a CNC rotary table for drilling and milling machine tools. Background Technology

[0002] As a core indexing accessory of drilling and milling machine tools, CNC rotary tables are widely used in the machining of circumferential mounting holes for rotating parts such as flanges. In the drilling of flanges, the industry generally adopts a clamping posture with the flange facing down and the pipe body facing up to lower the overall center of gravity of the workpiece, avoid the risk of clamping instability caused by top-heavy operation, and reduce the squeezing deformation of the pipe body structure caused by clamping force and drilling pressure. To address the drill bit's need for clearance during drilling in this clamping posture, most general-purpose rotary tables currently use a clamping scheme of pad support combined with independent fixtures. By adding adjustable pads to the rotary table to support the lower end face of the flange, reserving clearance space for the drill bit to penetrate the workpiece, and then using independent clamping fixtures to fix the outer circumference of the flange, the drilling requirements of flanges can be met. However, the above-mentioned CNC rotary tables still have certain shortcomings: First, the installation and positioning of the gaskets requires operators to adjust their positions along the slide grooves on the turntable surface and tighten them one by one using the threaded structure. Furthermore, the installation of the gaskets and the clamping process are independent of each other, resulting in a significant portion of the auxiliary time spent on workpiece clamping. In large-scale production operations, when frequently changing flanges of different specifications, changeover efficiency is significantly limited, thus hindering production efficiency improvement. Second, the support height and levelness of the gaskets depend on the operator's assembly and adjustment. Height deviations may occur between multiple sets of gaskets, causing the flange end face to be non-parallel to the turntable surface, directly affecting the perpendicularity accuracy between the drilling axis and the flange end face. Third, the gaskets only provide discrete support to a localized area of ​​the flange. When machining thin flanges, the axial drilling force can easily cause elastic deformation in the unsupported areas of the flange, leading to poor hole diameter consistency, excessively large burrs at the hole opening, and other machining defects. Summary of the Invention

[0003] In view of the above-mentioned technical problems, the present invention is proposed.

[0004] Therefore, the object of the present invention is to provide a CNC rotary table for a drilling and milling machine tool.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A CNC rotary table for a drilling and milling machine tool, comprising, Organism; A turntable mounted in the middle of the machine body rotates via a spindle; the turntable is used to support the flange pipe to be processed. It also includes a positioning module disposed between the turntable and the machine body, the positioning module comprising, The centering clamping assembly is used to retract radially along the turntable to radially center and clamp the flange tube, and to provide axial support for the edge of the flange tube; the clamping reference of the centering clamping assembly is matched with the lifting height of the follow-up lifting assembly to form a multi-stage integrated clamping system for lifting, locking and clamping under single power. A follow-up lifting assembly is used to axially lift the flange so that a drilling clearance is formed between the flange and the turntable surface. The control component is used to synchronously output power to the centering clamping component and the follow-up lifting component, and control the centering clamping component and the follow-up lifting component to perform actions in a preset sequence: first lift the flange pipe, then lock the flange pipe height, and finally clamp the flange pipe.

[0006] As a preferred embodiment of the CNC rotary table for drilling and milling machine tools of the present invention, it further includes a drive module disposed inside the machine body. The drive module includes a cylindrical roller sleeve fixedly sleeved on the outside of the spindle, and an arc-shaped cam worm gear that meshes with the cylindrical roller sleeve is rotatably mounted inside the machine body.

[0007] As a preferred embodiment of the CNC rotary table for drilling and milling machine tools of the present invention, a drive motor is fixedly installed on the outer side of the machine body, and the output shaft of the drive motor is connected to the arc-shaped cam worm gear through a reduction gear set.

[0008] As a preferred embodiment of the CNC rotary table for drilling and milling machine tools of the present invention, the centering and clamping assembly includes a plurality of linear slide grooves formed on the rotary table, the plurality of linear slide grooves being distributed along the central circumference of the rotary table, a slide rod being slidably installed in the linear slide groove, and an L-shaped gripper being fixedly installed at the end of the slide rod away from the machine body.

[0009] As a preferred embodiment of the CNC rotary table for drilling and milling machine tools of the present invention, wherein: the horizontal section of the L-shaped gripper is used to support the edge of the flange pipe, the vertical section of the L-shaped gripper is used to center and clamp the flange pipe, and the edge of the horizontal section of the L-shaped gripper is provided with a transition slope.

[0010] As a preferred embodiment of the CNC rotary table for drilling and milling machine tools of the present invention, the following lifting component includes a mounting groove formed on the rotary table, and a lifting plate is slidably installed in the mounting groove.

[0011] As a preferred embodiment of the CNC rotary table for drilling and milling machine tools of the present invention, wherein: the height of the lifting plate in the mounting groove is flush with the surface of the rotary table, and a plurality of radially protruding portions of the lifting plate are alternately arranged with a plurality of linear sliding grooves.

[0012] As a preferred embodiment of the CNC rotary table for drilling and milling machine tools of the present invention, the control component includes a control disk rotatably mounted on the side of the rotary table near the machine body, the control disk having a plurality of arc-shaped grooves corresponding to the linear slide grooves, and the slide rod slidingly engaging with the corresponding arc-shaped grooves.

[0013] As a preferred embodiment of the CNC rotary table for drilling and milling machine tools of the present invention, the control panel is fixedly installed with a plurality of circumferentially distributed lower arc rods, and an annular groove is provided on the rotary table, wherein the lower arc rods are slidably installed in the annular groove.

[0014] As a preferred embodiment of the CNC rotary table for drilling and milling machine tools of the present invention, wherein: a plurality of upper arc-shaped plates are fixedly installed on the side of the lifting plate near the machine body, which slide through the rotary table and extend into the annular groove, and the upper arc-shaped plates and the corresponding lower arc-shaped rods are provided with slopes on the side of the upper arc-shaped plates and the lower arc-shaped rods, and the upper arc-shaped plates and the corresponding lower arc-shaped rods are slidably engaged by the slopes.

[0015] The beneficial effects of the CNC rotary table for drilling and milling machine tools of the present invention are as follows: In this application, a positioning module comprising a centering and clamping component, a follow-up lifting component, and a control component is integrated between the turntable and the machine body. This allows for the sequential linkage of flange lifting, height locking, and centering clamping using a single power source, replacing the current decentralized operation of independent pad installation and independent clamps. This significantly shortens the auxiliary time for flange clamping and effectively improves the production changeover efficiency for processing multiple varieties and small batches of flanges. The follow-up lifting component supports the flange by axial lifting, ensuring that the flange end face remains aligned with the turntable surface. The parallel structure eliminates height deviation caused by operator adjustment of the pads, effectively ensuring the perpendicularity accuracy between the drilling axis and the flange end face. Simultaneously, the lifting plate and L-shaped clamps form a multi-point support structure, strengthening the overall rigidity of the flange clamping and reducing elastic deformation of the flange during drilling, thus improving hole diameter consistency and orifice machining quality. The uniform drilling clearance provides ample space for chip removal, preventing chip accumulation and scratching of the flange sealing end face, while also preventing chip jamming from affecting the indexing stability of the turntable. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a diagram showing the state of the present invention when the flange pipe is fixed.

[0018] Figure 2This is a three-dimensional structural diagram of the present invention.

[0019] Figure 3 This is a three-dimensional cross-sectional view of the internal structure of the machine body of the present invention.

[0020] Figure 4 This is a three-dimensional structural cross-sectional view of the cylindrical roller bushing, main shaft, and turntable of the present invention.

[0021] Figure 5 This is a three-dimensional structural diagram of the mounting groove, lifting plate, and L-shaped gripper of the present invention.

[0022] Figure 6 This is an exploded view of the three-dimensional structure of the control panel, arc-shaped groove, and lower arc-shaped rod of the present invention.

[0023] Figure 7 This is a three-dimensional structural cross-sectional view of the L-shaped gripper, linear groove, and slide bar of the present invention.

[0024] In the diagram: 1. Machine body; 2. Turntable; 3. Main shaft; 4. Drive module; 41. Cylindrical roller sleeve; 42. Arc-shaped cam worm gear; 43. Drive motor; 44. Reduction gear set; 5. Positioning module; 51. Centering clamping assembly; 511. Linear slide; 512. Slide rod; 513. L-shaped gripper; 514. Transition slope; 52. Follow-up lifting assembly; 521. Mounting slot; 522. Lifting plate; 53. Control assembly; 531. Control panel; 532. Arc-shaped groove; 533. Lower arc-shaped rod; 534. Upper arc-shaped plate; 535. Slope; 536. Annular groove; 6. Flange pipe; 61. Flange; 62. Pipe body. Detailed Implementation

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] Reference Figures 1-7 This embodiment provides a CNC rotary table for a drilling and milling machine tool, including: a machine body 1; a rotary table 2 rotatably mounted in the middle of the machine body 1 via a spindle 3, the rotary table 2 being used to support the flange pipe 6 to be processed; and a positioning module 5 disposed between the rotary table 2 and the machine body 1. The positioning module 5 includes: a centering clamping component 51, which is used to radially retract along the turntable 2 to radially center and clamp the flange tube 6, and provide axial support for the edge of the flange tube 6; the clamping reference of the centering clamping component 51 is matched with the lifting height of the follow-up lifting component 52 to form a multi-stage integrated clamping system of lifting, locking and clamping under single power; a follow-up lifting component 52, which is used to axially lift the flange 61 so that a drilling clearance is formed between the flange 61 and the table surface of the turntable 2; and a control component 53, which is used to synchronously output power to the centering clamping component 51 and the follow-up lifting component 52, and control the centering clamping component 51 and the follow-up lifting component 52 to perform actions in a preset sequence of first lifting the flange tube 6, then locking the flange tube 6 at its height, and finally clamping the flange tube 6.

[0027] It should be noted that the positioning module 5 is an integrated design to address the pain point of drilling short flange pipes 6 with the flange face facing down. The drilling avoidance lifting, radial centering clamping, and mechanical locking of the lifting height are integrated into the positioning module 5, and all actions are driven by a single power source. There is no need to configure additional independent pads and clamping fixtures, which can significantly shorten the auxiliary time for clamping flange pipes 6. At the same time, it avoids problems such as end face tilting and uneven avoidance gap caused by adjusting independent pads, and greatly improves the drilling verticality and hole position accuracy of flange mounting holes. The positioning module 5 is arranged coaxially with the turntable 2 and is arranged in a circumferential array around the rotation center of the turntable 2 to ensure centering accuracy and uniform force distribution, and adapts to the batch drilling needs of flange pipes 6 of different specifications.

[0028] Reference Figures 1-7 It also includes a drive module 4 disposed inside the machine body 1. The drive module 4 includes a cylindrical roller sleeve 41 fixedly sleeved on the outside of the main shaft 3, and an arc-shaped cam worm gear 42 that meshes with the cylindrical roller sleeve 41 is rotatably installed inside the machine body 1.

[0029] Reference Figures 1-7 A drive motor 43 is fixedly installed on the outside of the body 1. The output shaft of the drive motor 43 is connected to the arc-shaped cam worm gear 42 through a reduction gear set 44. The flange pipe 6 is composed of an integrally formed flange 61 and a pipe body 62.

[0030] It should be noted that the arc-shaped cam worm gear 42 and the cylindrical roller sleeve 41 together constitute the arc-shaped cam indexing mechanism. Compared with the worm gear transmission structure, it has higher indexing and positioning accuracy, smaller transmission backlash, and stronger axial load capacity, and can more accurately control the indexing angle of the turntable 2. The drive motor 43 is a servo motor, which can realize indexing and start / stop at any angle. The reduction gear set 44 is used to reduce the output speed and increase the output torque to adapt to the load requirements of the turntable 2 under heavy cutting conditions. The structure and working principle of the above-mentioned drive module 4 are all existing technologies, so they will not be described in detail in this application.

[0031] Reference Figures 1-7 The centering clamping assembly 51 includes a plurality of linear slide grooves 511 formed on the turntable 2. The plurality of linear slide grooves 511 are distributed along the central circumference of the turntable 2. A slide rod 512 is slidably installed in the linear slide groove 511. An L-shaped gripper 513 is fixedly installed at the end of the slide rod 512 away from the machine body 1.

[0032] Reference Figures 1-7 The horizontal section of the L-shaped clamp 513 is used to support the edge of the flange pipe 6, and the vertical section of the L-shaped clamp 513 is used to center and clamp the flange pipe 6. The edge of the horizontal section of the L-shaped clamp 513 is provided with a transition slope 514.

[0033] It should be noted that multiple sets of linear slides 511 are arranged in an equal-angled ring array with the center of the turntable 2 as the reference, and the extension direction of the slides is set along the radial direction of the turntable 2. This ensures that when each slide rod 512 and L-shaped gripper 513 move radially synchronously, the clamping force always points to the center of the turntable 2, automatically achieving coaxial alignment of the flange 61. The clamping working surface of the vertical section of the L-shaped gripper 513 is parallel to the axis of the turntable 2, ensuring that the axis of the flange 61 is completely coincident with the rotation axis of the turntable 2 after clamping. The supporting surface of the horizontal section is parallel to the table surface of the turntable 2, bearing the axial load of the flange pipe 6 while clamping radially, significantly improving the overall rigidity of the clamping. The transition slope 514 at the edge of the horizontal section is set at a chamfer, which serves as a guide when clamping the flange pipe 6 and avoids sharp edges from scratching the surface of the flange 61.

[0034] Reference Figures 1-7 The follow-up lifting component 52 includes a mounting groove 521 opened on the turntable 2. A lifting plate 522 is slidably installed in the mounting groove 521. The height of the lifting plate 522 when it is in the mounting groove 521 is flush with the surface of the turntable 2. Several radial protrusions of the lifting plate 522 are alternately arranged with several linear sliding grooves 511.

[0035] It should be noted that the lifting plate 522 adopts a multi-group integrated fan-shaped structure, which is alternately arranged with the straight slide groove 511 along the circumference of the turntable 2. This ensures uniform support for the flange 61 at multiple points, while completely avoiding the movement space of the slide rod 512 and the L-shaped clamp 513, thus preventing movement interference. In the initial state, the lifting plate 522 is completely housed in the mounting groove 521, with its top surface flush with the turntable 2, so that the flange pipe 6 can be stably attached to the table surface in the initial placement, without tilting due to local protrusions. The axial sliding stroke of the lifting plate 522 is limited by the lift of the slope 535. After being lifted into position, its top surface is exactly aligned with the horizontal support surface of the L-shaped clamp 513, ensuring that the flange 61 can smoothly transition to the clamp support state after being lifted, achieving a seamless connection between lifting and clamping actions.

[0036] Reference Figures 1-7 The control component 53 includes a control disk 531 rotatably mounted on the turntable 2 near the machine body 1. The control disk 531 has a plurality of arc-shaped grooves 532 corresponding to the linear slide grooves 511. The slide rod 512 slides in cooperation with the corresponding arc-shaped grooves 532.

[0037] Reference Figures 1-7 The control panel 531 is fixedly installed with a plurality of circumferentially distributed lower arc rods 533, and the turntable 2 is provided with an annular groove 536, in which the lower arc rods 533 are slidably installed.

[0038] Reference Figures 1-7 The lifting plate 522 is fixedly installed with a number of upper arc plates 534 that slide through the turntable 2 and extend into the annular groove 536 on the side near the machine body 1. The upper arc plates 534 and the lower arc rods 533 are provided with slopes 535 on the side close to each other. The upper arc plates 534 and the corresponding lower arc rods 533 are slidably engaged through the slopes 535.

[0039] It should be noted that the control disk 531 is a unified power conversion and timing control component of the positioning module 5. Only a single circumferential driving force input is needed to simultaneously achieve the timing association between the lifting drive and the clamping drive. In the initial stage of the circumferential rotation of the control disk 531, the slope 535 of the lower arc-shaped rod 533 first contacts and engages with the slope 535 of the upper arc-shaped plate 534, converting the circumferential rotation into the axial lifting motion of the lifting plate 522 through inclined plane transmission. After the lower arc-shaped rod 533 has completely rotated past the slope 535 section, its upper end plane forms a surface contact sliding engagement with the lower end plane of the upper arc-shaped plate 534, thus controlling the axial lifting motion of the lifting plate 522. The position forms a rigid mechanical lock, which can resist the axial cutting force during the drilling process and prevent the flange 61 from sinking or shifting. At the same time, the arc groove 532 rotates synchronously with the control panel 531, and moves the slide rod 512 radially along the straight slide groove 511 through the groove wall. By matching the initial circumferential position of the slope 535 with the lead angle of the arc groove 532, it can be ensured that the clamping action only enters the effective stroke after the lifting action is completed and locked. This ensures that after the flange 61 is lifted to the preset height, the L-shaped jaw 513 is exactly aligned with the outer circle clamping surface of the flange 61, realizing the orderly connection of the three processes of lifting, locking and clamping.

[0040] During use, in the initial state, the control panel 531 is in the reset position, the lifting plate 522 is completely stored in the mounting groove 521 and the top surface is flush with the table surface of the turntable 2, and each set of L-shaped grippers 513 opens outward to the maximum opening along the straight slide groove 511 with the slide rod 512, leaving space for the flange pipe 6 to be placed.

[0041] The flange pipe 6 to be processed is placed roughly on the lifting plate 522 in the middle of the turntable 2 with the flange 61 facing down and the pipe body 62 facing up, without the need for precise manual alignment. Then, the control disk 531 is driven by an external drive source to rotate circumferentially around the axis of the turntable 2 in a set direction. In the initial stage of rotation, the lower arc-shaped rod 533 on the control disk 531 moves circumferentially along the annular groove 536. The slope 535 at the end of the lower arc-shaped rod 533 gradually comes into contact with and presses against the slope 535 of the upper arc-shaped plate 534. The circumferential rotation is converted into axial lift through the inclined plane transmission pair, pushing the upper arc-shaped plate 534. The flange 61 slides upward along the axial direction of the annular groove 536, thereby driving the lifting plate 522 to rise vertically along the mounting groove 521, and smoothly lifting the flange 61 off the turntable 2 surface. After the slope 535 of the lower arc rod 533 completely slides over the slope 535 of the upper arc plate 534, the upper end plane of the lower arc rod 533 and the lower end plane of the upper arc plate 534 form a planar sliding fit, and the axial position of the lifting plate 522 is rigidly mechanically locked. At this time, a uniform drilling clearance is formed between the lower end face of the flange 61 and the turntable 2 surface, reserving sufficient space for the subsequent drill bit to penetrate the workpiece and for the chips to be discharged.

[0042] Throughout the rotation of the control disc 531, the arc-shaped groove 532 rotates synchronously with the disc, and its inner groove wall continuously pushes the slide rod 512, causing the slide rod 512 to move radially in a straight line along the straight slide groove 511 toward the center of the turntable 2. When the lifting action is completed and the locking stage is entered, the control disc 531 continues to rotate, and the vertical sections of multiple sets of L-shaped grippers 513 synchronously attach to the outer cylindrical surface of the flange 61 and gradually close, applying uniform clamping force from multiple circumferential directions, automatically achieving coaxial alignment between the flange 61 and the rotation axis of the turntable 2. At the same time, the horizontal section of the L-shaped grippers 513 supports the lower end face of the flange 61, and together with the lifting plate 522, it bears the axial load of the flange pipe 6, further strengthening the overall rigidity of the clamping.

[0043] After clamping, the drive module 4 starts, and the drive motor 43 drives the arc-shaped cam worm gear 42 to rotate after the reduction gear set 44 reduces the speed and increases the torque. The arc-shaped cam worm gear 42 meshes with the cylindrical roller sleeve 41 to drive the spindle 3 and the turntable 2 to rotate at a preset angle. Together with the drilling and milling machine, the drilling of the circumferentially distributed mounting holes of the flange 61 is completed in sequence. During the processing, the planar locking design of the lifting plate 522 can offset the axial drilling force and prevent the flange tube 6 from sinking and shifting. The multi-point centering clamping of the L-shaped jaw 513 can resist the radial cutting force and ensure the position accuracy of the hole and the perpendicularity of the drilling.

[0044] After all holes are machined, the control panel 531 rotates in the reverse direction to reset. First, the arc groove 532 reverses the sliding rod 512, causing the L-shaped gripper 513 to open radially outward, releasing the radial clamping of the flange 61. Then, the two sets of slopes 535 gradually disengage, and the lifting plate 522 falls down under the gravity of the flange pipe 6, resetting to the initial state flush with the table surface of the turntable 2. The flange 61 falls back to the table surface of the turntable 2, and the machined flange pipe 6 can be removed, completing a single machining cycle.

[0045] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A CNC rotary table for a drilling and milling machine tool, comprising: Body (1); The turntable (2) installed in the middle of the machine body (1) is rotated by the main shaft (3), and the turntable (2) is used to carry the flange pipe (6) to be processed. Its features are: It also includes a positioning module (5) disposed between the turntable (2) and the body (1), the positioning module (5) comprising, The centering clamping assembly (51) is used to radially retract along the turntable (2) to radially center and clamp the flange pipe (6) and provide axial support for the edge of the flange pipe (6); the clamping reference of the centering clamping assembly (51) is matched with the lifting height of the follow-up lifting assembly (52) to form a multi-stage integrated clamping system for lifting, locking and clamping under single power. Follow-up lifting assembly (52), the follow-up lifting assembly (52) is used to axially lift the flange (61) so that a drilling clearance is formed between the flange (61) and the table surface of the turntable (2); The control component (53) is used to synchronously output power to the centering clamping component (51) and the follow-up lifting component (52), and control the centering clamping component (51) and the follow-up lifting component (52) to perform actions in a preset sequence: first lift the flange pipe (6), then lock the height of the flange pipe (6), and finally clamp the flange pipe (6).

2. The CNC rotary table for drilling and milling machine tools as described in claim 1, characterized in that: It also includes a drive module (4) located inside the machine body (1), the drive module (4) including a cylindrical roller sleeve (41) fixedly sleeved on the outside of the main shaft (3), and an arc-shaped cam worm (42) that meshes with the cylindrical roller sleeve (41) is rotatably installed inside the machine body (1).

3. The CNC rotary table for drilling and milling machine tools as described in claim 2, characterized in that: A drive motor (43) is fixedly installed on the outside of the body (1). The output shaft of the drive motor (43) is connected to the arc-shaped cam worm (42) through a reduction gear set (44).

4. The CNC rotary table for drilling and milling machine tools as described in claim 3, characterized in that: The centering clamping assembly (51) includes a plurality of linear slide grooves (511) formed on the turntable (2). The plurality of linear slide grooves (511) are distributed along the central circumference of the turntable (2). A slide rod (512) is slidably installed in the linear slide groove (511). An L-shaped gripper (513) is fixedly installed at the end of the slide rod (512) away from the machine body (1).

5. The CNC rotary table for drilling and milling machine tools as described in claim 4, characterized in that: The horizontal section of the L-shaped clamp (513) is used to support the edge of the flange pipe (6), and the vertical section of the L-shaped clamp (513) is used to clamp the flange pipe (6) in the center. The edge of the horizontal section of the L-shaped clamp (513) is provided with a transition slope (514).

6. The CNC rotary table for drilling and milling machine tools as described in claim 5, characterized in that: The follow-up lifting component (52) includes a mounting groove (521) opened on the turntable (2), and a lifting plate (522) is slidably installed in the mounting groove (521).

7. The CNC rotary table for drilling and milling machine tools as described in claim 6, characterized in that: The height of the lifting plate (522) when it is in the mounting groove (521) is flush with the surface of the turntable (2), and several radial protrusions of the lifting plate (522) are alternately arranged with several linear slides (511).

8. The CNC rotary table for drilling and milling machine tools as described in claim 7, characterized in that: The control component (53) includes a control disk (531) rotatably mounted on the turntable (2) near the machine body (1). The control disk (531) has several arc-shaped grooves (532) corresponding to the linear slide groove (511). The slide rod (512) slides in cooperation with the corresponding arc-shaped groove (532).

9. The CNC rotary table for drilling and milling machine tools as described in claim 8, characterized in that: The control panel (531) is fixedly installed with several circumferentially distributed lower arc rods (533), and the turntable (2) is provided with an annular groove (536), and the lower arc rods (533) are slidably installed in the annular groove (536).

10. The CNC rotary table for drilling and milling machine tools as described in claim 9, characterized in that: The lifting plate (522) is fixedly installed with a sliding through turntable (2) on the side near the machine body (1) and extends into the annular groove (536) with a number of upper arc plates (534). The upper arc plates (534) and the lower arc rods (533) are provided with slopes (535) on the side close to each other. The upper arc plates (534) and the corresponding lower arc rods (533) slide together through the slopes (535).

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