Self-rotating collet mechanism

Abstract

This application provides an automatic rotary collet mechanism, including a collet chuck for clamping a workpiece to be processed and a collet chuck drive device for driving the collet chuck to move. The collet chuck and a power transmission shaft are disposed within the internal space formed by the rotating shaft. The power transmission shaft is driven to perform axial reciprocating motion by the pressure generated by the fluid in the fluid channel. One end of the power transmission shaft is provided with a pull lug, and one end of the collet chuck is provided with a limiting groove that matches the shape of the pull lug. A closed fluid channel is formed inside the rotating shaft. The collet chuck, driven by the pull lug, performs axial reciprocating motion along the rotating shaft while simultaneously clamping or retracting radially along the rotating shaft. The automatic rotary collet mechanism provided by this application improves clamping stability and helps to improve the processing quality of the workpiece clamped therein.

Description

Technical Field

[0001] This application relates to the field of rotary clamping technology, and more particularly to an automatic rotary collet mechanism. Background Technology

[0002] Planetary roller screws are crucial components of humanoid robots, determining their joint performance. Internal thread grinding, as a high-precision machining process, places extremely stringent requirements on workpiece clamping stability, positioning accuracy, and clamping force control. This is especially true for high-precision workpieces like planetary roller screws, where clamping stability directly determines the quality of the machined screw nut. Traditional collet clamping mechanisms often employ hydraulic, pneumatic, or mechanical lever drives, clamping the workpiece by axially pulling the collet to radially retract it. While widely used, these methods often have complex internal structures and long power transmission links, resulting in poor clamping stability and negatively impacting the grinding effect. Utility Model Content

[0003] This application provides an automatic rotating collet mechanism to solve the problems of complex structure, long power transmission link and poor clamping stability of existing collet mechanisms.

[0004] Specifically, the following technical solutions are included:

[0005] This application provides an automatic rotary collet mechanism, including a collet chuck for clamping a workpiece to be processed and a collet chuck drive device for driving the collet chuck to move. The motor driving the rotating shaft includes a stator and a rotor. The rotor is connected to the rotating shaft. The collet chuck and a power transmission shaft are arranged in the internal space formed by the rotating shaft. The collet chuck drive device includes a power transmission shaft. The rotating shaft is connected to the turntable housing through a rotating shaft bearing. A closed fluid channel is formed inside the rotating shaft. The power transmission shaft is driven to perform axial reciprocating motion by the pressure formed by the fluid in the fluid channel. A pull lug is provided at one end of the power transmission shaft. A limiting groove matching the shape of the pull lug is provided at one end of the collet chuck. The fluid channel is also provided with a rotating sealing ring connected to the power transmission shaft. The collet chuck is driven by the pull lug to perform axial reciprocating motion along the rotating shaft while simultaneously clamping or retracting radially along the rotating shaft.

[0006] Optionally, the turntable housing includes a base and a turntable, the turntable having a through hole inside, and multiple annular mounting portions with different inner diameters arranged along the axial direction of the turntable.

[0007] Optionally, the stator is fixedly connected to the stator mounting hole provided on the turntable.

[0008] Optionally, a rotating shaft bearing mounting hole is also provided on the side of the annular mounting portion located on one side of the turntable housing, and the rotating shaft bearing is connected to the rotating shaft.

[0009] Optionally, a motor stator mounting slot is formed inside the turntable housing, and the stator is mounted in the motor stator mounting slot.

[0010] Optionally, the fluid is a gas, the inlet of the fluid channel is a gas pipe connector, the gas pipe connector is installed on the gas guide end cover, the gas guide end cover is provided with the fluid channel and a rotary seal mounting groove, and a sealed cavity is formed between the rotary seal ring and the rotating shaft.

[0011] Optionally, the clamping air guide flange that mates with the air guide end cap is provided with the fluid channel and the rotary sealing groove, forming a rotary sealing cavity with the air guide end cap.

[0012] Optionally, a sliding seal is formed between the clamping air guide flange and the power transmission shaft through a sliding seal ring on the power transmission shaft, and a sliding seal is formed between the power transmission shaft and the rotating shaft through a sliding seal ring on the power transmission shaft.

[0013] Optionally, the clamping air guide flange is fixed to the rotating shaft with screws, and a static seal is formed between the two by an O-ring.

[0014] Optionally, the stator is further provided with a motor cooling water inlet and outlet, and an O-ring is also provided on the stator. The motor cooling water inlet and outlet are connected to the closed space formed by the O-ring.

[0015] The automatic rotary collet mechanism provided in this application includes a collet chuck for clamping a workpiece to be processed and a collet chuck drive device for driving the collet chuck to move. The motor driving the rotating shaft includes a stator and a rotor. The rotor is connected to the rotating shaft. The collet chuck and a power transmission shaft are arranged in the internal space formed by the rotating shaft. The collet chuck drive device includes a power transmission shaft. The rotating shaft is connected to the turntable housing through a rotating shaft bearing. A closed fluid channel is formed inside the rotating shaft. The power transmission shaft is driven to perform axial reciprocating motion by the pressure formed by the fluid in the fluid channel. A pull lug is provided at one end of the power transmission shaft. A limiting groove matching the shape of the pull lug is provided at one end of the collet chuck. The fluid channel is also provided with a rotating sealing ring connected to the power transmission shaft. The collet chuck is driven by the pull lug to perform axial reciprocating motion along the rotating shaft while simultaneously clamping or retracting radially along the rotating shaft. This application uses a fluid channel to drive the power transmission shaft, and utilizes the cooperation between the pull lug and the limiting groove to directly pull the collet axially, achieving clamping and loosening. The structure is compact, the transmission is direct, and backlash and energy loss are reduced. The fluid pressure enables precise, stable, and adjustable control of the clamping force to adapt to different working conditions. The cooperation between the pull lug and the groove ensures high repeatability and anti-slip capability. It is easy to integrate with CNC systems and supports automated clamping under high-speed rotation, thereby improving the machining accuracy, stability, and production efficiency of internal thread grinding. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0017] Figure 1 This is a schematic diagram of the structure of the first rotary clamping mechanism provided in this application;

[0018] Figure 2 This application provides a schematic diagram of the structure of a turntable housing;

[0019] Figure 3 A partial structural schematic diagram of a rotary clamping mechanism provided in this application;

[0020] Figure 4 A partial cross-sectional schematic diagram of the first rotary clamping mechanism provided in this application;

[0021] Figure 5 A partial cross-sectional schematic diagram of the second type of rotary clamping mechanism provided in this application;

[0022] Figure 6 A schematic diagram of the fluid channel portion of the first rotary clamping mechanism provided in this application;

[0023] Figure 7A schematic diagram of the fluid channel portion of the second rotary clamping mechanism provided in this application;

[0024] Figure 8 This is a partial cross-sectional schematic diagram of the third type of rotary clamping mechanism provided in this application.

[0025] Figure label:

[0026] Collet chuck 11;

[0027] Power transmission shaft 12; pull lug 121;

[0028] Turntable housing 13; base 131; turntable 132;

[0029] Stator 15;

[0030] Rotor 16;

[0031] Fluid passage 17; First airway 171; Second airway 172; Third airway 173; Fourth airway 174;

[0032] Slide stop 18;

[0033] Annular mounting part 1A;

[0034] Air guide end cap 1B; First air guide end cap 1B1; Second air guide end cap 1B2;

[0035] Shaft bearing mounting hole 1C;

[0036] Motor cooling inlet and outlet 1D.

[0037] Sliding sealing ring 1E;

[0038] Stator mounting hole 1F;

[0039] 1G shaft;

[0040] Rotary sealing ring 1H;

[0041] Clamping gas guide flange 1I;

[0042] endotracheal connector 1K; first endotracheal connector 1K1; second endotracheal connector 1K2;

[0043] Shaft bearing 1Z.

[0044] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0045] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0046] Planetary roller screws are a crucial component in humanoid robotics, directly determining the flexibility of the robot's joints. Internal thread grinding is a critical step in the machining process of planetary roller screws. In high-precision machining fields such as internal thread grinding, workpiece stability and precise clamping are core prerequisites for ensuring machining quality. Most existing collet clamping mechanisms employ hydraulic, pneumatic, or mechanical lever drives. While these methods can clamp the workpiece, their designs are often complex, resulting in long power transmission chains and poor clamping stability. This typically leads to significant cumulative errors, high costs, and inconvenient maintenance. Regarding transmission accuracy, excessively long transmission chains introduce more backlash and elastic deformation, causing uneven clamping force transmission and sluggish response, directly resulting in poor clamping stability. The workpiece is prone to wobble during grinding, and this small error is significantly amplified during finishing. Furthermore, traditional clamping force control is not precise enough and is difficult to integrate efficiently with CNC systems, thus limiting clamping efficiency, repeatability, and the overall automation level of the machining process.

[0047] In view of this, this application provides an automatic rotary clamping mechanism. This mechanism employs a simplified internal structure, driving a power transmission shaft via a fluid channel. The engagement of the pull lug and the limiting groove directly moves the collet axially, achieving clamping and releasing of the workpiece. The mechanism is compact, with direct transmission, reducing backlash and energy loss. Fluid pressure enables precise, stable, and adjustable control of the clamping force, adapting to different working conditions. The engagement of the pull lug and the groove ensures high repeatability and anti-slip capability. It is easily integrated with CNC systems, supporting automated clamping under high-speed rotation, thereby improving the machining accuracy, stability, and production efficiency of internal thread grinding.

[0048] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. Figures 1-8 The following is a schematic diagram of the structure of the series of rotary clamping mechanisms provided in this application. The embodiments of this application will be described below with reference to the accompanying drawings.

[0049] like Figure 1 As shown, this application provides an automatic rotary collet mechanism, including a collet chuck 11 for clamping a workpiece to be processed and a collet chuck drive device for driving the collet chuck 11 to move. The motor driving the rotating shaft 1G to rotate includes a stator 15 and a rotor 16. The rotor 16 is connected to the rotating shaft 1G. The collet chuck and a power transmission shaft are arranged in the internal space formed by the rotating shaft. The collet chuck drive device includes a power transmission shaft 12. The rotating shaft 1G is connected to the turntable housing 13 through a rotating shaft bearing 1Z. G has a partially enclosed fluid channel 17 inside. The power transmission shaft 12 is driven by the pressure formed by the fluid in the fluid channel 17 to make axial reciprocating motion. One end of the power transmission shaft 12 is provided with a pull lug 121. One end of the collet 11 is provided with a limiting groove that matches the shape of the pull lug 121. The fluid channel 17 is also provided with a rotating sealing ring connected to the power transmission shaft 12. The collet 11 is driven by the pull lug 121 to make axial reciprocating motion along the rotating shaft 1G while simultaneously clamping or retracting radially along the rotating shaft 1G.

[0050] In addition to the power transmission shaft 12, the aforementioned collet chuck drive device may also include other components, which can be configured according to the needs of those skilled in the art. For example, when the fluid is gas, the collet chuck drive device may also include a gas pipe connector 1K for pumping gas into the fluid channel 17.

[0051] The aforementioned power transmission shaft 12 can be a solid structure or a hollow structure, and this application does not limit it. When the power transmission shaft 12 is a hollow structure, it can provide space for workpiece clamping / processing, further improving the usability of the automatic rotary collet mechanism.

[0052] The fluid can be a gas or a liquid (including oil, water, etc.). The fluid channel 17 may include multiple sub-channels, located on both sides of the power transmission shaft 12. The fluid channels 17 on different sides are used to provide fluid pressure in different directions to the power transmission shaft 12, so as to drive the power transmission shaft 12 to move in different directions.

[0053] The aforementioned limiting groove is the groove that can wrap around the pull lug 121. Since the fluid channel 17 is provided with a rotating sealing ring that can be connected to the power transmission shaft 12, the fluid channel 17 can remain sealed during the movement of the power transmission shaft 12.

[0054] Optionally, the side of the collet 11 away from the workpiece can be an inclined plane. With this implementation, during the axial reciprocating motion driven by the pull lug 121 along the rotating shaft 1G, the collet 11 can achieve vertical displacement perpendicular to the axial direction based on the inclined plane, thereby achieving clamping or retraction in the radial direction of the rotating shaft 1G.

[0055] The automatic rotating collet mechanism provided in this application may include, for example, two parts, upper and lower, each of which includes a collet chuck 11. At least one part includes a power transmission shaft 12. At least one collet chuck 11 can move axially under the pull of the power transmission shaft 12.

[0056] The motor that drives the 1G rotating shaft can be, for example, a servo motor or a direct drive motor, and this application does not impose any restrictions.

[0057] Taking the inclined plane of the collet 11 on the side away from the workpiece as an example (left-lower, right-higher), specifically, in the above implementation, when it is necessary to clamp the workpiece, the operator places the workpiece between the upper and lower collet 11s, activates the power chuck drive device, and fills the fluid channel 17 with fluid, thereby applying pressure to the power transmission shaft 12. For example, the fluid in the right fluid channel 17 can apply pressure to the power transmission shaft 12, pushing the power transmission shaft 12 to the left, and then, based on the cooperation between the pull lug 121 and the limiting groove, push the collet 11 to the left. Due to the downward displacement of the inclined plane, the workpiece is clamped. Subsequently, after the collet 11 clamps the workpiece, the motor driving the rotating shaft 1G starts, driving the rotating shaft 1G to rotate, which in turn drives the power transmission shaft 12 and the collet 11 to rotate, thereby realizing the rotation of the workpiece.

[0058] When it is necessary to release the collet chuck 11, the motor driving the rotating shaft 1G is first turned off, causing the workpiece to stop rotating. Then, the fluid channel 17 on the left side of the collet drive device is filled with fluid to apply a rightward force to the power transmission shaft 12. The power transmission shaft 12 moves to the right, simultaneously pulling the collet chuck 11 to the right based on the engagement between the pull lug 121 and the limiting groove. The collet chuck 11, based on an inclined plane that is lower on the left and higher on the right, moves upward while moving to the right, thereby releasing the clamped workpiece.

[0059] The automatic rotary collet mechanism provided in this application has a simple structure. It controls the clamping and releasing of the collet chuck 11 on the workpiece through the fluid channel 17, the power transmission shaft 12, the pull lug 121, and the limiting groove. The motor that drives the rotating shaft 1G provides rotational power to the workpiece.

[0060] The core innovation of this technical solution lies in its simple and ingenious structural design. By directly driving the power transmission shaft 12 through fluid pressure, and utilizing the interaction between the pull lug 121 on the shaft and the collet limiting groove, near-direct power transmission from the source to the actuator is achieved. This "pull lug-groove" meshing connection method is inherently simple and reliable, replacing the traditional complex connecting rod or piston mechanism and significantly shortening the power transmission link. This not only makes the overall structure more compact, saving axial and radial space, but also fundamentally reduces intermediate backlash and elastic deformation in the transmission link, laying a mechanical foundation for high-precision control. Furthermore, based on the aforementioned short and rigid power transmission path, this solution brings a significant improvement in control performance. The shortened transmission link means faster response speed and less signal attenuation, allowing changes in fluid pressure to be more accurately and quickly converted into axial displacement of the collet and the final clamping force. This directly improves the accuracy and stability of clamping force control, effectively avoiding problems such as lag and fluctuations in traditional long-link transmissions. Ultimately, this design ensures that the workpiece achieves an extremely stable and precisely reproducible clamping state during high-speed grinding, thereby meeting the stringent requirements of ultra-high precision and reliability in internal thread grinding.

[0061] Optionally, in some embodiments, the turntable housing 13 may include, for example, a base 131 and a turntable 132. A through hole is formed inside the turntable 132, and multiple annular mounting portions 1A with different inner diameters are provided along the axial direction of the turntable 132. This application does not limit the specific dimensions of the inner diameters; those skilled in the art can set them according to their needs. This implementation method meets the installation requirements of workpieces of various sizes, expanding the application scenarios and flexibility of the automatic rotary collet mechanism provided in this application.

[0062] Optionally, in some embodiments, the stator 15 is fixedly connected to the stator mounting hole 1F provided on the turntable 132. This reliable connection method can further improve the stability of the automatic rotary collet mechanism provided in this application.

[0063] Optionally, a shaft bearing mounting hole 1C is also provided on the side of the annular mounting portion 1A located on one side of the turntable housing 13, and the shaft bearing 1Z is connected to the shaft 1G. This method can effectively connect the annular mounting portion 1A and the shaft bearing mounting hole 1C, so that when the motor driving the shaft 1G rotates, it can correspondingly drive the annular mounting portion 1A to rotate, providing reliable rotational power for the workpiece to be processed.

[0064] Optionally, a motor stator mounting slot is formed inside the turntable housing 13, and the stator 15 is installed in the motor stator mounting slot. This embodiment provides a direct and stable method for installing the stator 15, achieving a tight fit and reliable fixation between the stator 15 and the housing, ensuring the uniformity of the air gap between the motor stator 15 and the rotor 16, and improving motor efficiency and operational stability.

[0065] The fluid can be a liquid (oil, water, etc.) or a gas. Optionally, when the fluid is a gas, the inlet of the fluid channel 17 is a gas pipe connector 1K, which is installed on the gas guide end cover 1B. The gas guide end cover 1B has the fluid channel 17 and a rotary seal mounting groove, forming a sealed cavity between the rotary seal ring 1H, the rotating shaft 1G, and the clamping gas guide flange 1I. Since the fluid is a gas, the fluid channel 17 here is actually a gas passage. This design allows for effective high-pressure gas pumping, providing movement power for the power transmission shaft 12. Moreover, when the fluid is a gas, it greatly ensures internal cleanliness and extends the service life of the automatic rotary collet mechanism.

[0066] Optionally, in some embodiments, the clamping air guide flange 1I that mates with the air guide end cover 1B has a fluid channel 17 and a rotary sealing groove, forming a rotatable sealed cavity with the air guide end cover 1B. The term "air channel" here refers to the fluid channel 17 when the fluid is gas. This implementation effectively seals the fluid channel 17 inside the rotary clamping mechanism provided in this application, ensuring effective driving force for the power transmission shaft 12, and features a simple structure and low manufacturing cost.

[0067] Optionally, a sliding seal is formed between the clamping air guide flange 1I and the power transmission shaft 12 through a sliding seal ring 1E on the power transmission shaft 12, and a sliding seal is also formed between the power transmission shaft 12 and the rotating shaft 1G through the sliding seal ring 1E on the power transmission shaft 12. Due to the formation of these sliding seals, it can be ensured that the fluid passage 17 connected to the power transmission shaft 12 remains sealed during movement, thus ensuring the availability of the mechanism.

[0068] Optionally, the clamping air guide flange 1I is fixed to the rotating shaft 1G with screws, and a static seal is formed between the two by an O-ring. Since the clamping air guide flange 1I is directly fixed to the rotating shaft 1G, there is no need for mutual movement between the two. Therefore, the static seal formed between the two by the O-ring can ensure the usability of this application.

[0069] Optionally, in some embodiments, the stator 15 is further provided with a motor cooling inlet / outlet 1D and an O-ring seal, and the motor cooling inlet / outlet 1D is connected to the closed space formed by the O-ring seal. This implementation achieves, on the one hand, an integrated design of the cooling channel and the housing, allowing the coolant to flow directly through the heat-concentrated area around the stator 15, resulting in a short and efficient heat dissipation path; on the other hand, it effectively controls the motor temperature rise, reduces the impact of thermal deformation on accuracy, and improves the continuous working performance and reliability of the mechanism.

[0070] In addition, the radial movement of the collet 11 can be achieved by the inclined surface of its outer circumference and the mating slope provided with the rotating shaft 1G or the power transmission shaft 12, thereby generating radial movement during the axial movement. At the same time, a separate radial drive mechanism can also be provided on the rotating shaft 1G or the collet 11 to drive the collet 11 to perform radial movement.

[0071] The following uses a gas as an example to illustrate this application through specific embodiments.

[0072] Optionally, when the fluid is a gas, the mechanism may be a cylinder structure. The fluid passage 17 may, for example, include a separate fluid passage 17 located on the left and a fluid passage 17 located on the right. Specifically, refer to... Figure 4 In some embodiments, the fluid channel 17 may include, for example, a first air passage 171, a second air passage 172, a third air passage 173, and a fourth air passage 174, with specific connections as shown in the attached figures. The first air passage 171 and the third air passage 173 may both be connected to an air pipe connector 1K, which includes a first air pipe connector 1K1 connecting to the first air passage 171 and a second air pipe connector 1K2 connecting to the third air passage 173. In practical use, when compressed air (the compressed air pressure may be, for example, 0.2 MPa to 2 MPa) is introduced into the first air pipe connector 1K1, the power transmission shaft 12 moves to the left under the pressure. The pull lug 121 at the front end of the power transmission shaft 12 drives the collet 11 to move to the left. The collet 11 can be a rubber collet or a diaphragm collet. During the leftward movement, the collet 11 contracts under the action of the sliding stop 18, clamping the workpiece to be processed. When compressed air (compressed air pressure can be, for example, 0.2MPa~0.8MPa) is introduced into the second air pipe connector 1K2, the power transmission shaft 12 moves to the right under the pressure of the air. The pull lug 121 at the front end of the power transmission shaft 12 drives the collet 11 to move to the right, and the collet 11 automatically opens to release the workpiece.

[0073] This implementation method is simple to operate, allowing operators to easily and conveniently introduce pressurized gas into the first air pipe connector 1K1 and the second air pipe connector 1K2 respectively, so as to clamp or release the workpiece to be processed by the collet chuck 11, thus making the rotating clamping mechanism provided in this application have good usability.

[0074] The slide block 18 can be configured to be fixedly connected to the rotating shaft 1G, or it can be movably connected to the rotating shaft 1G. Alternatively, the slide block 18 can be elastically connected to the pull lug 121. For example, an elastic component such as a spring can be provided on the end face of the pull lug 121 near the slide block 18 and connected to the slide block 18. In this implementation, the power transmission shaft 12 can generate better restoring force during the return process.

[0075] Optionally, when the fluid is a gas, in some embodiments, the air pipe connector 1K can be installed on the air guide end cover 1B, which includes a first air guide end cover 1B1 and a second air guide end cover 1B2. The first air guide end cover 1B1 is connected to the first air pipe connector 1K1, and the second air guide end cover 1B2 is connected to the second air pipe connector 1K2. A rotary seal mounting groove is provided on the air guide end cover 1B, forming a rotatable sealed cavity between the rotary seal ring 1H and the rotating shaft 1G. Compressed air enters the first air passage 171 through the cavity between the seal rings, and then enters the cavity formed by the power transmission shaft 12 and the rotating shaft 1G, which is the second air passage 172, pushing the power transmission shaft 12 to the left and generating clamping power. Optionally, the rotary seal mounting groove can be formed on the air guide end cover 1B or on its corresponding shaft; this application does not limit it.

[0076] In this implementation method, the clamping force can be steplessly adjusted by regulating the intake air pressure to adapt to the clamping requirements of workpieces with different wall thicknesses.

[0077] Optionally, in some embodiments, the second air pipe connector 1K2 is installed on the second air guide end cover 1B2. The second air guide end cover 1B2 has a third air passage 173, and the clamping air guide flange 1I that cooperates with it has a fourth air passage 174 and a rotary sealing groove. The rotary sealing ring 1H on both sides seals the air guide end cover 1B and the rotating shaft 1G to form a rotatable sealed cavity. The compressed cavity enters the fourth air passage 174 formed by the clamping air guide flange 1I, the rotating shaft 1G, and the power transmission shaft 12 through the third air passage 173 and the sealed cavity (the clamping air guide flange 1I is fixed to the rotating shaft 1G by screws, and the two are statically sealed by an O-ring seal. The clamping air guide flange 1I and the power transmission shaft 12 are slidingly sealed by a sliding sealing ring 1E on the power transmission shaft 12. The power transmission shaft 12 and the hollow rotating shaft 1G are slidingly sealed by a sliding sealing ring 1E on the power transmission shaft 12). This pushes the cylinder to move to the right, causing the workpiece to be released.

[0078] Optionally, in some embodiments, at the non-clamping end, that is, the side without the collet 11, a dustproof sealing ring is installed in the mounting groove of the clamping air guide flange 1I to form an interference contact with the power transmission shaft 12, preventing the intrusion of processed metal chips during the movement of the power transmission shaft 12; at the clamping end, that is, the side where the collet 11 is located, an air seal is used for protection, and an air pipe connector 1K is installed on the air guide end cover 1B. The air guide end cover 1B has an air passage and a rotary seal mounting groove, and a rotary seal ring 1H is installed in the groove to ensure that compressed air enters the air passage on the rotating shaft 1G without leakage through the air passage. An air seal is formed at the right air seal outlet to prevent the intrusion of cutting metal chips.

[0079] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0080] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. An automatic rotary collet mechanism, comprising a collet chuck for clamping a workpiece to be processed and a collet chuck drive device for driving the collet chuck to move, wherein a motor for driving a rotating shaft to rotate comprises a stator and a rotor, the rotor being connected to the rotating shaft, characterized in that, The internal space formed by the rotating shaft is equipped with a collet chuck and a power transmission shaft. The collet chuck driving device includes the power transmission shaft. The rotating shaft is connected to the turntable housing through a rotating shaft bearing. A closed fluid channel is formed inside the rotating shaft. The power transmission shaft is driven to perform axial reciprocating motion by the pressure formed by the fluid in the fluid channel. One end of the power transmission shaft is provided with a pull lug. One end of the collet chuck is provided with a limiting groove that matches the shape of the pull lug. The fluid channel is also provided with a rotating sealing ring connected to the power transmission shaft. The collet chuck is driven by the pull lug to perform axial reciprocating motion along the rotating shaft while simultaneously clamping or retracting radially along the rotating shaft.

2. The automatic rotating collet mechanism as described in claim 1, characterized in that, The turntable housing includes a base and a turntable. The turntable has a through hole inside and multiple annular mounting parts with different inner diameters are arranged along the axial direction of the turntable.

3. The automatic rotating collet mechanism as described in claim 2, characterized in that, The stator is fixedly connected to the stator mounting hole provided on the turntable.

4. The automatic rotating collet mechanism as described in claim 2, characterized in that, A rotating shaft bearing mounting hole is also provided on the side of the annular mounting part located on one side of the turntable housing, and the rotating shaft bearing is connected to the rotating shaft.

5. The automatic rotating collet mechanism as described in claim 2, characterized in that, The turntable housing has a motor stator mounting slot inside, and the stator is installed in the motor stator mounting slot.

6. The automatic rotating collet mechanism as described in claim 1, characterized in that, The fluid is a gas, the inlet of the fluid channel is a gas pipe connector, the gas pipe connector is installed on the gas guide end cover, the gas guide end cover is provided with the fluid channel and a rotary seal mounting groove, and a sealed cavity is formed between the rotary seal ring and the rotating shaft.

7. The automatic rotating collet mechanism as described in claim 6, characterized in that, The clamping air guide flange that mates with the air guide end cap has the fluid channel and the rotary sealing groove, forming a rotary sealing cavity with the air guide end cap.

8. The automatic rotating collet mechanism as described in claim 7, characterized in that, A sliding seal is formed between the clamping air guide flange and the power transmission shaft through a sliding seal ring on the power transmission shaft, and a sliding seal is formed between the power transmission shaft and the rotating shaft through a sliding seal ring on the power transmission shaft.

9. The automatic rotating collet mechanism as described in claim 7, characterized in that, The clamping air guide flange is fixed to the rotating shaft with screws, and a static seal is formed between the two by an O-ring.

10. The automatic rotary collet mechanism as described in claim 1, characterized in that, The stator is also provided with motor cooling water inlet and outlet, and an O-ring is also provided on the stator. The motor cooling water inlet and outlet are connected to the closed space formed by the O-ring.

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