High-precision rotary transmission device and workpiece clamping and rotating method thereof

Abstract

The application discloses a kind of high-precision rotary transmission equipment and workpiece clamping and rotating method, belong to machining technical field.The equipment includes mounting seat, rotating main body, rotary drive mechanism, at least two inner support unit groups and corresponding number of inner support drive mechanism;Rotating main body is rotatably supported on mounting seat, at least two inner support unit groups are arranged along rotating main body axial interval, each inner support unit group includes multiple inner support units that are uniformly distributed in circumferential direction, each inner support unit has support piece;Each inner support drive mechanism is used to drive all support pieces in corresponding inner support unit group to be synchronous radial expansion and contraction.When clamping, workpiece is sleeved on the outside of rotating main body, inner support drive mechanism is started to make all support pieces synchronous radial expansion and abut against the inner wall of workpiece, realize multi-section synchronous centering clamping;Subsequently, rotating drive mechanism is started to drive workpiece to rotate.The application realizes high-precision centering by multi-section synchronous inner support, clamping is stable, and rotating precision is high.

Description

Technical Field

[0001] This invention relates to the field of machining technology, specifically to a high-precision rotary transmission device and its workpiece clamping and rotation method, which is particularly suitable for the internal support clamping and rotary drive of cylindrical workpieces. Background Technology

[0002] In the field of machining, clamping and rotating cylindrical or tubular workpieces are common processing requirements. Traditional internal support fixtures typically use mechanical expansion sleeves or hydraulic expansion to clamp the inner wall of the workpiece. However, such fixtures have the following problems in practical applications: First, the expansion force is unevenly distributed axially, which can easily lead to excessive local stress on the workpiece and deformation, affecting machining accuracy. Second, the centering accuracy of the fixture is limited, making it difficult to guarantee the coaxiality of the workpiece during rotation, especially for slender cylindrical workpieces, where single-point or single-segment support cannot effectively suppress runout during rotation. In addition, existing fixtures lack precise synchronization between the various support components, resulting in poor consistency of clamping actions, which further limits the improvement of machining accuracy. Therefore, there is an urgent need for a rotary transmission device that can achieve multi-point, multi-segment synchronous internal support with high centering accuracy. Summary of the Invention

[0003] The purpose of this invention is to provide a high-precision rotary transmission device and its workpiece clamping and rotation method to solve the problems of low clamping centering accuracy, uneven axial support and poor synchronization in the prior art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A high-precision rotary transmission device includes a mounting base, a rotating body, a rotary drive mechanism, at least two inner support unit groups, and an inner support drive mechanism corresponding to the number of inner support unit groups. The rotating body is rotatably supported on the mounting base, and the rotary drive mechanism is used to drive the rotating body to rotate. The at least two inner support unit groups are arranged at intervals along the axial direction of the rotating body. Each inner support unit group includes multiple inner support units evenly distributed along the circumference of the rotating body. Each inner support unit has a support member for supporting the inner wall of the workpiece to be processed. Each inner support drive mechanism is used to drive all the support members in the corresponding inner support unit group to synchronously extend and retract radially.

[0005] Furthermore, a rotating assembly is provided at the rear end of the rotating body, the rotating assembly including a mounting body and a rotating body; the mounting body is fixed on the mounting base, the rotating body is rotatably connected to the mounting body, and the rear end of the rotating body is fixedly connected to the rotating body; the rotating drive mechanism includes a servo motor and a reducer, and the rotating drive mechanism is provided on the mounting body.

[0006] Furthermore, at least two internal support unit groups include a first internal support unit group and a second internal support unit group, with the first internal support unit group located at the front section of the rotating body and the second internal support unit group located at the rear section of the rotating body.

[0007] Furthermore, the internal support drive mechanism includes a first internal support drive mechanism and a second internal support drive mechanism. Both the first internal support drive mechanism and the second internal support drive mechanism are disposed inside the end of the rotating body and drive the first internal support unit group and the second internal support unit group independently, respectively.

[0008] Furthermore, each internal support unit includes a scissor-type telescopic mechanism; the scissor-type telescopic mechanism includes an upper fixed plate, an upper fixed block, an upper slide rail, an upper mounting plate, an upper mounting block, a lower fixed block, a lower slide rail, a lower mounting plate, a lower mounting block, an outer connecting rod, and an inner connecting rod; two upper fixed blocks are symmetrically arranged on one side of the lower part of the upper fixed plate, two upper slide rails are symmetrically arranged on the other side of the lower part of the upper fixed plate, the upper fixed plate is slidably connected to the two upper slide rails, and two upper mounting blocks are symmetrically arranged on the lower part of the upper fixed plate; two lower fixed blocks are symmetrically arranged on one side of the exterior of the rotating body, two lower slide rails are symmetrically arranged on the other side of the exterior of the rotating body, and the lower mounting plate is slidably connected to the two lower slide rails. A set of lower mounting blocks are symmetrically arranged on the upper part of the lower mounting plate; one end of each of the two outer connecting rods is connected to a lower rotating shaft one between the two lower fixed blocks, and the other end of each of the two outer connecting rods is connected to an upper rotating shaft two between the two upper mounting blocks; one end of each of the two inner connecting rods is connected to a lower rotating shaft two between the two lower mounting blocks, and the other end of each of the two inner connecting rods is connected to an upper rotating shaft one between the two upper fixed blocks; the first inner support drive unit and the second inner support drive unit are both connected to the bottom of the corresponding lower mounting plate; each of the two upper slide rails is slidably connected to an upper slider, and the upper fixed plate is set on the two upper sliders; each of the two lower slide rails is slidably connected to a lower slider, and the lower mounting plate is set on the two lower sliders.

[0009] Furthermore, the two inner links are positioned between the two outer links, and a central pivot is connected in series between the two inner links and the two outer links.

[0010] Furthermore, each inner support unit also includes a roller assembly, which constitutes a support member. The roller assembly includes a roller mounting base, a roller shaft, a roller, and a pressure sensor. The roller mounting base is located on the upper part of the upper fixed plate, the two ends of the roller shaft are connected to the two sides of the roller mounting base, the roller is sleeved and connected to the middle of the roller shaft, and the pressure sensor is located between the roller mounting base and the upper fixed plate to detect the supporting force of the roller on the inner wall of the workpiece.

[0011] Further, the first internal support drive mechanism includes a first servo motor, a first reducer, a first coupling, a first lead screw, a first connecting seat, and a first linkage body; the first servo motor is connected to the first reducer, the first reducer is connected to the first coupling, both ends of the first lead screw are connected between two first connecting seats, and one end of the first lead screw is connected to the first coupling, the first linkage body is movably connected to the first lead screw, and the outer periphery of the first linkage body is evenly provided with first internal support drive parts, and the first internal support drive parts are drively connected to the internal support units in the first internal support unit group; the second internal support drive mechanism includes a second servo motor, a second reducer, a second coupling, a second lead screw, a second connecting seat, and a second linkage body; the second servo motor is connected to the second reducer, the second reducer is connected to the second coupling, both ends of the second lead screw are connected between two second connecting seats, and one end of the second lead screw is connected to the second coupling, the second linkage body is movably connected to the second lead screw, and the outer periphery of the second linkage body is evenly provided with second internal support drive parts, and the second internal support drive parts are drively connected to the internal support units in the second internal support unit group.

[0012] Furthermore, the rotating body is elongated and its cross-section is triangular.

[0013] The present invention also provides a workpiece clamping and rotation method using the above-mentioned high-precision rotary transmission device, comprising: S1. The workpiece to be processed is sleeved on the outside of the rotating body along the axial direction, so that the inner wall of the workpiece covers the area where the support members of each inner support unit group are located. S2. Start each inner support drive mechanism, and each inner support drive mechanism drives all the support components in the corresponding inner support unit group to extend outward in a synchronous radial direction. The pressure sensor detects the support force of each roller on the inner wall of the workpiece in real time until all the support components are pressed against the inner wall of the workpiece to be processed, so as to realize the clamping and centering of the workpiece. S3. Start the rotary drive mechanism to drive the rotating body to rotate around its axis and drive the clamped workpiece to rotate synchronously. Beneficial effects

[0014] This invention provides a high-precision rotary transmission device and its workpiece clamping and rotation method, which has the following advantages compared with the prior art: 1. By arranging at least two inner support unit groups at intervals along the axis of the rotating body, multi-segment synchronous support of the inner wall of the cylindrical workpiece is achieved, effectively dispersing the clamping stress, avoiding local deformation of the workpiece, and significantly improving the clamping stability.

[0015] 2. Multiple inner support units in each inner support unit group are evenly distributed along the circumference and are driven by the same inner support drive mechanism to extend and retract synchronously in the radial direction, ensuring that each support point moves and applies force synchronously, thereby obtaining high centering accuracy and effectively suppressing sway during rotation.

[0016] 3. The scissor-type telescopic mechanism is used as the transmission core of the inner support unit. It has a compact structure and can accurately convert the axial movement of the lead screw into radial large-stroke telescopic movement, with high transmission efficiency and good rigidity.

[0017] 4. Employing an independent servo motor driven by a reducer and lead screw, it can precisely control the radial position and clamping force of the support components, making it suitable for flexible clamping of workpieces with different inner diameters and offering a high degree of automation. Pressure sensors are directly integrated into the roller assembly, providing real-time and accurate feedback on the clamping force at each support point.

[0018] 5. The support uses a roller assembly, which provides radial support while rotating with the workpiece, reducing frictional resistance and preventing scratches on the inner wall of the workpiece. It is especially suitable for precision machining or inspection of the inner wall of the workpiece. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the high-precision rotary transmission device of the present invention; Figure 2 for Figure 1 3D structure diagram omitting mounting base Figure 1 ; Figure 3 for Figure 1 3D structure diagram omitting mounting base Figure 2 ; Figure 4 for Figure 2 A three-dimensional structural diagram of the internal support unit group is omitted. Figure 5 This is a three-dimensional assembly structure of the internal support unit and the support member of the present invention. Figure 1 ; Figure 6 This is a three-dimensional assembly structure of the internal support unit and the support member of the present invention. Figure 2 ; Figure 7 This is a three-dimensional assembly structure of the internal support unit and the support member of the present invention. Figure 3 ; Figure 8 for Figure 5 Front view structural diagram; Figure 9 This is a three-dimensional structural schematic diagram of the first internal support drive mechanism of the present invention; Figure 10 This is a schematic diagram of the front view of the first internal support drive mechanism of the present invention; Figure 11 This is a three-dimensional structural schematic diagram of the second internal support drive mechanism of the present invention; Figure 12 This is a front view schematic diagram of the second internal support drive mechanism of the present invention.

[0020] In the diagram: 1. Mounting base; 2. Rotating main body; 3. Rotation drive mechanism; 31. Servo motor; 32. Reducer; 4. Inner support unit group; 41. First inner support unit group; 42. Second inner support unit group; 5. Inner support drive mechanism; 51. First inner support drive mechanism; 511. First servo motor; 512. First reducer; 513. First coupling; 514. First lead screw; 515. First connecting seat; 516. First linkage body; 5161. First inner support drive part; 52. Second inner support drive mechanism; 521. Second servo motor; 522. Second reducer; 523. Second coupling; 524. Second lead screw; 525. Second linkage body 526. Connector; 5261. Second internal support drive unit; 6. Internal support unit; 8. Support component; 81. Roller mounting seat; 82. Roller; 83. Roller; 84. Pressure sensor; 21. Mounting body; 22. Rotating body; 61. Upper fixed plate; 62. Upper fixed block; 63. Upper slide rail; 64. Upper mounting plate; 65. Upper mounting block; 66. Lower fixed block; 67. Lower slide rail; 68. Lower mounting plate; 69. Lower mounting block; 70. Outer connecting rod; 71. Inner connecting rod; 72. Lower rotating shaft one; 73. Lower rotating shaft two; 74. Upper rotating shaft one; 75. Upper rotating shaft two; 76. Lower sliding block; 77. Central rotating shaft; 9. Loading limit mechanism. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1 to 12 As shown, the present invention provides a high-precision rotary transmission device for realizing the internal support clamping and precision rotary drive of cylindrical workpieces. The device mainly includes a mounting base 1, a rotating body 2, a rotary drive mechanism 3, a first internal support unit group 41, a second internal support unit group 42, a first internal support drive mechanism 51, and a second internal support drive mechanism 52.

[0023] Mounting base 1 is a base with an integral casting or welded structure, possessing high rigidity and stability. Its bottom surface can be fixed to the machine tool worktable or other machining platform by bolts. The upper part of mounting base 1 has a precision-machined surface for mounting rotating components.

[0024] The rotating body 2 is a long, hollow structure with an equilateral triangular cross-section. The three outer planes of the triangular cross-section serve as mounting reference planes, spaced 120° apart, facilitating precise placement of the internal support units. The rotating body 2 has an axially machined through-hole cavity inside to accommodate the first internal support drive mechanism 51 and the second internal support drive mechanism 52. This triangular design not only ensures structural rigidity but also provides a regular mounting space for the internal drive components.

[0025] The rear end of the rotating body 2 is equipped with a rotating assembly, specifically including a mounting body 21 and a rotating body 22. The mounting body 21 is precisely fixed to the mounting base 1 by bolts and locating pins. The rotating body 22 is rotatably supported in the inner hole of the mounting body 21 by a set of preloaded angular contact ball bearings, capable of withstanding combined radial and axial loads. The rear end face of the rotating body 2 is fixedly connected to the flange face of the rotating body 22 by bolts, thereby ensuring that the rotating body 2 can rotate freely about its axis relative to the mounting base 1 with high precision.

[0026] The rotary drive mechanism 3 includes a servo motor 31 and a reducer 32. The reducer 32 can be mounted on one side of the mounting body 21 via a flange. The output shaft of the servo motor 31 is connected to the input shaft of the reducer 32, and the output shaft of the reducer 32 is connected to the rotating body 22 via a key or spline. The servo motor 31 is equipped with a high-resolution encoder, which can precisely control the rotation angle and speed. When the servo motor 31 starts, it drives the rotating body 22 to rotate after the torque is increased by the reducer 32, thereby driving the rotating body 2 and all the internal support units mounted on it to rotate together.

[0027] The first inner support unit group 41 is arranged at the front section of the rotating body 2, and the second inner support unit group 42 is arranged at the rear section of the rotating body 2. The two groups maintain a predetermined axial distance, which can be designed according to the length of the workpiece. Each inner support unit group includes three inner support units 6, which are respectively installed on the three outer planes of the rotating body 2 and are evenly distributed along the circumference 360°. Each inner support unit 6 has a support member 8 at its end for supporting the inner wall of the workpiece to be processed. In this embodiment, the support member 8 is specifically a roller assembly.

[0028] The first inner support drive mechanism 51 and the second inner support drive mechanism 52 are both installed in the hollow cavity at the end of the rotating body 2 and are arranged at intervals along the axial direction. They are used to independently drive all the inner support units 6 in the first inner support unit group 41 and the second inner support unit group 42 to synchronously extend and retract radially.

[0029] Specifically, the first internal support drive mechanism 51 includes a first servo motor 511, a first reducer 512, a first coupling 513, a first lead screw 514, a first connecting seat 515, and a first linkage 516. Two first connecting seats 515 are fixed to designated positions within the inner cavity of the rotating body 2 by screws, and support bearings are installed within them. The two ends of the first lead screw 514 are respectively installed within the bearings of the two first connecting seats 515, and the axis of the first lead screw 514 coincides with the axis of the rotating body 2. The first servo motor 511 and the first reducer 512 are installed inside the front end of the rotating body 2. The output shaft of the first reducer 512 is coaxially connected to one end of the first lead screw 514 via the first coupling 513 to transmit torque.

[0030] The first linkage 516 has a disc-shaped or prismatic structure with an internally threaded hole machined in its center, which mates with the external thread of the first lead screw 514 to form a lead screw and nut pair. To prevent the first linkage 516 from rotating with the lead screw, an axial guide groove is provided on the inner wall of the rotating body 2 or on the additional guide rod. A guide key or guide block (not shown in the figure) is provided at the corresponding part of the first linkage 516, so that it can only move axially. Three radially outwardly extending first inner support drive parts 5161 are evenly distributed on the outer periphery of the first linkage 516. The end of each first inner support drive part 5161 is fixedly connected to the bottom of the lower mounting plate 68 of the corresponding inner support unit 6.

[0031] The structure and working principle of the second inner support drive mechanism 52 are exactly the same as those of the first inner support drive mechanism 51, including a second servo motor 521, a second reducer 522, a second coupling 523, a second lead screw 524, a second connecting seat 525, and a second linkage body 526. Three second inner support drive parts 5261 are evenly distributed on the outer periphery of the second linkage body 526, each connected to the bottom of the lower mounting plate of the corresponding inner support unit in the second inner support unit group 42. The first inner support drive mechanism 51 and the second inner support drive mechanism 52 are independently controlled by the control system, and their respective radial extension stroke and clamping force can be adjusted.

[0032] The core transmission component of each inner support unit 6 is a scissor-type telescopic mechanism. Taking one inner support unit 6 in the first inner support unit group 41 as an example, its specific structure will be described in detail.

[0033] On the outer triangular surface of the rotating body 2, near the rear end, two lower fixing blocks 66 are welded or fixed with screws. The two lower fixing blocks 66 are symmetrically arranged with a certain distance between them along the axial direction. A lower rotating shaft 72 is installed between the two lower fixing blocks 66. The two ends of the lower rotating shaft 72 can be fixed with nuts or shoulders, allowing it to rotate relative to the lower fixing blocks 66 or remain stationary. On the same outer surface, near the front end, two lower sliding rails 67 are fixed with screws. The extension direction of the two lower sliding rails 67 is parallel to the axis of the rotating body 2, and they are symmetrically arranged relative to the positions of the lower fixing blocks 66.

[0034] Each lower slide rail 67 is slidably fitted with a lower slide block 77. The lower surface of the lower mounting plate 68 is fastened to the two lower slide blocks 77 by screws, so that the lower mounting plate 68 can slide precisely in a straight line along the lower slide rail 67. The upper surface of the lower mounting plate 68 is fixed with two symmetrically erected lower mounting blocks 69 by screws. A lower rotating shaft 73 is installed between the two lower mounting blocks 69. The two ends of the lower rotating shaft 73 are supported in the holes of the lower mounting blocks 69 and can rotate freely.

[0035] Above, the upper fixing plate 61 is a horizontally arranged plate. Two upper fixing blocks 62 are fixed to one side of the lower surface of the upper fixing plate 61 by screws, and an upper rotating shaft 74 is installed between the two upper fixing blocks 62. Two upper slide rails 63 are fixed to the other side of the lower surface of the upper fixing plate 61 by screws, and the length direction of the upper slide rails 63 is parallel to the lower slide rail 67. Each upper slide rail 63 has a sliding upper slider 76. The upper mounting plate 64 is fixed to the lower surface of the two upper sliders 76 by screws, allowing the upper mounting plate 64 to slide along the upper slide rails 63. Two upper mounting blocks 65 are fixed to the lower surface of the upper mounting plate 64, and an upper rotating shaft 75 is installed between the two upper mounting blocks 65, allowing the upper rotating shaft 75 to rotate freely.

[0036] The linkage assembly of the scissor telescopic mechanism consists of two outer connecting rods 70, two inner connecting rods 71, and a central rotating shaft 78. The two outer connecting rods 70 are located on the outer sides, with one end hinged to both ends of the lower rotating shaft 72 and the other end hinged to both ends of the upper rotating shaft 75. The two inner connecting rods 71 ​​are located inside the two outer connecting rods 70, with one end hinged to both ends of the lower rotating shaft 73 and the other end hinged to both ends of the upper rotating shaft 74. The central rotating shaft 78 passes through a through hole in the middle of the two outer connecting rods 70 and the two inner connecting rods 71, allowing the four connecting rods to hinge at the center, forming a classic scissor-shaped structure. This structure ensures that when the distance between the upper rotating shaft 75 and the lower rotating shaft 72 changes, the distance (i.e., the radial position) between the upper fixed plate 61 and the outer side of the rotating body 2 will change accordingly, and the upper fixed plate 61 will always remain parallel to the axis of the rotating body 2 during the change, without any skew.

[0037] The end of the first inner support drive unit 5161 is fastened to the bottom of the lower mounting plate 68 by bolts. When the first servo motor 511 drives the first lead screw 514 to rotate, the first linkage 516 moves axially along the first lead screw 514, and drives the lower mounting plate 68 to slide along the lower slide rail 67 through the first inner support drive unit 5161. The lower slide rail 67 and the lower mounting plate 68 form a precise axial moving pair, converting the rotational motion of the servo motor into the linear motion of the lower mounting plate 68.

[0038] When radial extension is required to clamp the workpiece, the first servo motor 511 drives the first lead screw 514 to rotate, causing the first linkage body 516 to move the lower mounting plate 68 along the lower slide rail 67 towards the lower fixed block 66. At this time, the second lower rotating shaft 73 moves towards the lower fixed block 66, causing the lower end of the inner connecting rod 71 to move inward. Since the middle part of the inner connecting rod 71 is hinged to the outer connecting rod 70 through the central rotating shaft 78, and the lower end of the outer connecting rod 70 is constrained to a fixed position by the first lower rotating shaft 72, under the action of leverage, the upper end of the inner connecting rod 71 pushes the upper fixed block 62 and the upper fixed plate 61 to move radially outward; at the same time, the upper end of the outer connecting rod 70 also pushes the upper mounting plate 64 to slide along the upper slide rail 63 towards the upper fixed block 62, assisting the upper fixed plate 61 to extend radially outward smoothly. During this process, the upper fixed plate 61 always remains parallel to the axis of the rotating body 2. Conversely, when retraction is required, the lower mounting plate 68 moves away from the lower fixed block 66, and the upper fixed plate 61 retracts radially inward. By rationally designing the connecting rod length, initial included angle, and lead screw lead, the required telescopic stroke and force amplification ratio can be obtained.

[0039] The roller assembly, serving as a support member 8, is mounted on the upper part of the upper fixed plate 61. Specifically, the roller assembly includes a roller mounting base 81, a roller 82, a roller 83, and a pressure sensor 84. The roller mounting base 81 is a U-shaped frame, fixed to the upper surface of the upper fixed plate 61 by bolts. The two side plates of the roller mounting base 81 are machined with coaxial through holes, through which the two ends of the roller 82 pass and are fixed with lock nuts or snap rings. The roller 83 is fitted onto the middle of the roller 82 via a pair of deep groove ball bearings or needle roller bearings, allowing it to rotate freely relative to the roller 82. The outer circumferential surface of the roller 83 can be machined into a cylindrical surface or a slightly curved surface to better conform to the inner wall of the workpiece. The roller 83 can be made of wear-resistant alloy steel with surface hardening treatment, or coated with a layer of elastic material such as polyurethane on its outer circumference to increase friction and protect the inner surface of the workpiece. The pressure sensor 84 is located between the roller mounting base 81 and the upper fixed plate 61. It is used to detect the supporting force of the roller 83 on the inner wall of the workpiece in real time and feed the force signal back to the control system to form a closed-loop control of the clamping force.

[0040] The structure of the inner support unit in the second inner support unit group 42 is exactly the same as that described above. The bottom of its lower mounting plate is connected to the second inner support drive unit 5261 and is independently controlled by the second inner support drive mechanism 52.

[0041] This embodiment also includes a loading limiting mechanism 9, which is located outside the rotating body 2, specifically behind the second inner support drive mechanism 52. When the workpiece to be processed is axially inserted from the front end of the rotating body 2, the rear end face of the workpiece will abut against the front end face of the loading limiting mechanism 9, thereby axially positioning the workpiece and ensuring that the inner wall of the workpiece is precisely aligned axially with the rollers of the first inner support unit group 41 and the second inner support unit group 42, thus ensuring the consistency and repeatability of the clamping position.

[0042] The method for clamping a cylindrical workpiece using the high-precision rotary transmission device of this embodiment includes the following detailed steps: S1. Installing the workpiece: First, the first inner support drive mechanism 51 and the second inner support drive mechanism 52 are reset through the control system, so that the inner support unit 6 is in a radially retracted state to facilitate the insertion of the workpiece. The operator or robot arm inserts the cylindrical workpiece to be processed axially from the front end of the rotating body 2 until the rear end face of the workpiece abuts against the front end face of the loading limit mechanism 9. At this time, the inner wall of the workpiece completely covers the area where the rollers 83 of the first inner support unit group 41 and the second inner support unit group 42 are located.

[0043] S2. Internal Support Clamping: The first internal support drive mechanism 51 is activated. The first servo motor 511 drives the first lead screw 514 to rotate via the first reducer 512 and the first coupling 513, causing the first linkage body 516 to move axially along the first lead screw 514 in a preset direction. This drives the three first internal support drive units 5161 to simultaneously push the lower mounting plate 68 of the corresponding internal support unit 6 to slide along the lower slide rail 67 towards the lower fixed block 66. Through the scissor telescopic mechanism, the three upper fixed plates 61 and the roller assembly extend radially outward synchronously and at the same speed. When the roller 83 contacts the inner wall of the workpiece, the pressure sensor 84 detects the supporting force of the roller 83 on the inner wall of the workpiece in real time and feeds the force signal back to the control system. The control system continues to drive the servo motor according to the preset clamping force value until the set clamping force is reached, completing the clamping of the first internal support unit group 41. Then, the second internal support drive mechanism 52 is activated in the same manner, causing the three rollers of the second internal support unit group 42 to extend radially outward synchronously and clamp the inner wall of the workpiece. It can also control two groups to move simultaneously, using synchronicity to make the workpiece automatically align its axis during the spreading process.

[0044] S3. Rotary Drive: After the workpiece is securely clamped, the rotary drive mechanism 3 is activated. The servo motor 31 drives the rotating body 22 and the rotating main body 2 to rotate via the reducer 32, and the workpiece rotates along with it. Because the inner wall of the workpiece and the roller 83 are in rolling contact, the frictional torque is small, and the rotation is smooth. The rotation speed and angle can be controlled according to the processing needs to perform turning, grinding, inspection and other operations on the workpiece.

[0045] It should be noted that in the above embodiments, the number and arrangement of the inner support unit groups and inner support units, the roller type, and the specific structure of the feeding limit mechanism can all be appropriately adjusted according to actual applications. For example, there can be three or more inner support unit groups, and the number of inner support units in each inner support unit group can be two or four. The cross-sectional shape of the rotating body can be designed as other polygons, the roller assembly can be replaced with an adjustable slider, and the feeding limit mechanism can also adopt a threaded limit ring with adjustable axial position, etc. As long as the core technical solution of multi-segment synchronous inner support is adopted, it falls within the protection scope of this invention.

Claims

1. A high-precision rotary transmission device, characterized in that, The system includes a mounting base (1), a rotating body (2), a rotating drive mechanism (3), at least two inner support unit groups (4), and an inner support drive mechanism (5) corresponding to the number of inner support unit groups (4). The rotating body (2) is rotatably supported on the mounting base (1), and the rotating drive mechanism (3) is used to drive the rotating body (2) to rotate. The at least two inner support unit groups (4) are arranged at intervals along the axial direction of the rotating body (2). Each inner support unit group (4) includes multiple inner support units (6) evenly distributed along the circumference of the rotating body (2). Each inner support unit (6) has a support member (8) for supporting the inner wall of the workpiece to be processed. Each inner support drive mechanism (5) is used to drive the support member (8) in the corresponding inner support unit group (4) to synchronously extend and retract radially.

2. The high-precision rotary transmission device according to claim 1, characterized in that, The rear end of the rotating body (2) is provided with a rotating component, which includes a mounting body (21) and a rotating body (22); the mounting body (22) is fixed on the mounting base (1), and the rotating body (22) is rotatably connected to the mounting body (21); the rear end of the rotating body (2) is fixedly connected to the rotating body (22); the rotating drive mechanism (3) includes a servo motor (31) and a reducer (32), and the rotating drive mechanism (3) is provided on the mounting body (21).

3. The high-precision rotary transmission device according to claim 1, characterized in that, The at least two inner support unit groups (4) include a first inner support unit group (41) and a second inner support unit group (42), wherein the first inner support unit group (41) is disposed at the front section of the rotating body (2) and the second inner support unit group (42) is disposed at the rear section of the rotating body (2).

4. The high-precision rotary transmission device according to claim 1 or 3, characterized in that, The inner support drive mechanism (5) includes a first inner support drive mechanism (51) and a second inner support drive mechanism (52). The first inner support drive mechanism (51) and the second inner support drive mechanism (52) are both located inside the end of the rotating body (2) and drive the first inner support unit group (41) and the second inner support unit group (42) independently, respectively.

5. The high-precision rotary transmission device according to claim 1, characterized in that, Each of the aforementioned inner support units (6) includes a scissor telescopic mechanism; the scissor telescopic mechanism includes an upper fixed plate (61), an upper fixed block (62), an upper slide rail (63), an upper mounting plate (64), an upper mounting block (65), a lower fixed block (66), a lower slide rail (67), a lower mounting plate (68), a lower mounting block (69), an outer connecting rod (70), and an inner connecting rod (71); two upper fixed blocks (62) are symmetrically arranged on one side of the lower part of the upper fixed plate (61), two upper slide rails (63) are symmetrically arranged on the other side of the lower part of the upper fixed plate (61), the upper fixed plate (61) is slidably connected to the two upper slide rails (63), two upper mounting blocks (65) are symmetrically arranged on the lower part of the upper fixed plate (61); two lower fixed blocks (66) are symmetrically arranged on one side of the outside of the rotating body (2), two lower slide rails (67) are symmetrically arranged on the other side of the outside of the rotating body (2), and the lower mounting plate (68)... Two sliding rails (67) are slidably connected to the two lower sliding rails (67), and two lower mounting blocks (69) are symmetrically arranged on the upper part of the lower mounting plate (68); one end of the two outer connecting rods (70) is connected to the lower rotating shaft one (72) between the two lower fixed blocks (66), and the other end of the two outer connecting rods (70) is connected to the upper rotating shaft two (75) between the two upper mounting blocks (65); one end of the two inner connecting rods (71) is connected to the lower rotating shaft two (73) between the two lower mounting blocks (69), and the other end of the two inner connecting rods (71) is connected to the upper rotating shaft one (74) between the two upper fixed blocks (62); both upper sliding rails (63) are slidably connected to upper sliding blocks (76), and the upper fixed plate (61) is arranged on the two upper sliding blocks (76); both lower sliding rails (67) are slidably connected to lower sliding blocks (77), and the lower mounting plate (68) is arranged on the two lower sliding blocks (77).

6. The high-precision rotary transmission device according to claim 5, characterized in that, Two inner links (71) are located between two outer links (70), and a central pivot (78) is connected in series between the two inner links (71) and the two outer links (70).

7. The high-precision rotary transmission device according to claim 5, characterized in that, Each of the inner support units (8) further includes a roller assembly, which constitutes the support member (8); the roller assembly includes a roller mounting base (81), a roller (82), a roller (83) and a pressure sensor (84). The roller mounting base (81) is disposed on the upper part of the upper fixed plate (61). The two ends of the roller (82) are connected to the two sides of the roller mounting base (81). The roller (83) is sleeved and connected to the middle part of the roller (82). The pressure sensor (84) is disposed between the roller mounting base (81) and the upper fixed plate (61) for detecting the supporting force of the roller (83) on the inner wall of the workpiece.

8. The high-precision rotary transmission device according to claim 4, characterized in that, The first internal support drive mechanism (51) includes a first servo motor (511), a first reducer (512), a first coupling (513), a first lead screw (514), a first connecting seat (515), and a first linkage body (516); the first servo motor (511) is connected to the first reducer (512), the first reducer (512) is connected to the first coupling (513), the two ends of the first lead screw (514) are connected between the two first connecting seats (515), and one end of the first lead screw (514) is connected to the first coupling (513), the first linkage body (516) is movably connected to the first lead screw (514), and the outer periphery of the first linkage body (516) is evenly provided with first internal support drive parts (5161), and the first internal support drive parts (5161) are connected to the internal support unit (6) in the first internal support unit group (41) in a transmission connection; The second internal support drive mechanism (52) includes a second servo motor (521), a second reducer (522), a second coupling (523), a second lead screw (524), a second connecting seat (525), and a second linkage body (526). The second servo motor (521) is connected to the second reducer (522), the second reducer (522) is connected to the second coupling (523), the two ends of the second lead screw (524) are connected between the two second connecting seats (525), and one end of the second lead screw (524) is connected to the second coupling (523). The second linkage body (526) is movably connected to the second lead screw (524). The second internal support drive part (5261) is evenly distributed on the outer periphery of the second linkage body (526), ​​and the second internal support drive part (5261) is connected to the internal support unit (6) in the second internal support unit group (42) for transmission.

9. The high-precision rotary transmission device according to claim 1, characterized in that, The rotating body (2) is long and narrow, and its cross-section is triangular.

10. A method for clamping and rotating a workpiece using the high-precision rotary transmission device of claim 1, characterized in that, include: S1. The workpiece to be processed is sleeved on the outside of the rotating body (2) along the axial direction, so that the inner wall of the workpiece covers the area where the support member (8) of each inner support unit group (4) is located. S2. Start each inner support drive mechanism (5), and each inner support drive mechanism (5) drives all the support members (8) in the corresponding inner support unit group (4) to extend outward in a synchronous radial direction until all the support members (8) press against the inner wall of the workpiece to be processed, so as to realize the clamping and centering of the workpiece. S3. Start the rotary drive mechanism (3) to drive the rotary body (2) to rotate around its axis and drive the clamped workpiece to rotate synchronously.

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