A direct drive rotary table employing a standard two-layer oil way distributor

Abstract

The application discloses a direct drive rotary table adopting a standard double-layer oil path distributor, relates to the technical field of rotary tables, and comprises a rotary distributor seat fixed on a rotary table shell, a standard oil path distributor for oil supply is installed above the rotary distributor seat, a grating seat is installed above the standard oil path distributor, a grating for detecting the displacement of the rotary table is fixed on the grating seat, and an oil path adapter seat is connected with the oil outlet of the standard oil path distributor. The grating seat is directly installed above the standard oil path distributor, an installation platform is provided for the grating, the standard oil path distributor can be used while space is left for installing the grating, the invasion of cutting fluid and dust is effectively blocked, the stability and accuracy of the grating operation are realized, the heat generated by bearings and motors is taken away by the cooling water channel, the thermal deformation of key structural parts is significantly reduced, and the accuracy and stability of the rotary table under long-time operation or high load are improved.

Description

Technical Field

[0001] This invention relates to the field of rotary table technology, specifically a direct-drive rotary table employing a standard double-layer hydraulic distributor. Background Technology

[0002] A rotary table is a precision mechanical platform capable of precise and controllable rotation around one or more axes. Its main function is to support workpieces or tools and, during machining or measurement, change their angular position by rotation to achieve multi-faceted machining, indexing, circumferential cutting, or precise measurement.

[0003] Turntables that traditionally use standard oil circuit distributors have a large axial dimension, which can severely encroach on or even completely occupy the space required to install high-precision gratings, resulting in no place to install the gratings or difficulty in installation. If a self-made oil circuit distributor is used, the design of self-developed components is complex, the reliability has not been fully verified, the manufacturing and maintenance costs are high, the supply chain is unstable, and there may be failures such as leakage due to immature design.

[0004] Combining the above issues, we find that existing direct-drive rotary tables on the market are difficult to avoid all of the problems mentioned above when in use. Even if they can be solved, they require the use of external tools, which fails to achieve the desired effect. Therefore, we propose a direct-drive rotary table that uses a standard double-layer oil circuit distributor. Summary of the Invention

[0005] The purpose of this invention is to provide a direct-drive rotary table using a standard double-layer oil circuit distributor to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a direct-drive rotary table employing a standard double-layer oil circuit distributor, comprising a rotary distributor seat fixed on a turntable housing, a standard oil circuit distributor for oil supply mounted above the rotary distributor seat, a grating seat mounted above the standard oil circuit distributor, a grating for detecting turntable displacement fixed on the grating seat, an oil circuit adapter connected to the oil outlet of the standard oil circuit distributor, the grating being mounted on the turntable housing via an adjusting shim and a grating moving flange, and a worktable oil circuit interface fixed to the top of the grating moving flange.

[0007] Preferably, the standard oil distributor and the grating are fixed on the stationary turntable housing by the rotary distributor seat, and the lubricating oil is transported from the stationary turntable housing to the rotating worktable by the standard oil distributor.

[0008] Preferably, the rotating shaft of the standard oil circuit distributor rotates with the worktable, while the stator of the standard oil circuit distributor remains stationary.

[0009] Preferably, the stator of the grating reads the displacement of the mover to detect the rotation angle and position of the turntable in real time, and the stator of the grating is fixed on the grating base.

[0010] Preferably, the adjusting shim and the grating mover are mounted on the grating mover flange to drive the grating mover to rotate, and the adjusting shim is used to adjust the gap between the grating mover and the stator.

[0011] Preferably, the oil supply structure is connected to the rotating structure on the turntable via the oil circuit interface of the worktable, so as to deliver lubricating oil to the parts that need lubrication.

[0012] Preferably, the grating mount is equipped with a baffle to prevent cutting fluid and dust from entering the grating stator. The baffle includes a connecting pipe installed in an annular air passage, and the side of the annular air passage is connected to a connecting pipe for an external air source to enter.

[0013] Preferably, the annular air passage is equipped with a filter screen for filtering compressed air, and the surface of the annular air passage is provided with an arc-shaped slit one and a slit two, with slit one located on the periphery of slit two, and the width of both slit one and slit two is set to 0.05-0.1mm.

[0014] Preferably, the rotary distributor base is equipped with a cooling component for dissipating heat from the motor and bearings. The top of the rotary distributor base has a mounting groove, and the outer side of the rotary distributor base has a through hole communicating with the mounting groove. The cooling component includes a water pipe with continuous S-bends and a heat-conducting strip installed inside the through hole. The water pipe is installed inside the mounting groove.

[0015] Preferably, a stepped groove is provided on the upper end of the outer wall of the rotary distributor seat, and a sealing cover that fits onto the mounting groove is threaded onto the stepped groove.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention integrates the standard oil circuit distributor and the high-precision grating together in the case of limited axial space by using a coaxial stacked design of a rotary distributor seat, a standard oil circuit distributor, and a grating seat. The grating seat is directly installed on top of the standard oil circuit distributor, providing an installation platform for the grating. This allows for the use of a standard oil circuit distributor while still leaving space for the installation of the grating.

[0017] 2. The core rotary seal oil supply of this invention adopts a standard oil circuit distributor on the market, which avoids the complex self-made rotary seal design, reduces the difficulty and cost of design, manufacturing and maintenance. In addition, the standard oil circuit distributor has higher reliability and maturity, reducing the possibility of lubricating oil leakage.

[0018] 3. This invention, through the design of the baffle component, installs an annular air passage on the grating seat and blows a clean air curtain through gap one and gap two to the grating reading head, effectively blocking the intrusion of cutting fluid and dust, and achieving stability and accuracy of grating operation; through the design of the cooling component, a continuous S-curve cooling water channel is installed inside the rotary distributor seat to remove the heat generated by the bearing and motor, significantly reducing the thermal deformation of key structural components and improving the accuracy and stability of the worktable under long-term operation or high load. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the present invention; Figure 2 This is a schematic diagram of the structure of the grating holder and the blocking component of the present invention; Figure 3 This is an exploded view of the blocking component of the present invention; Figure 4 This is a schematic diagram of the structure of the rotary distributor seat and cooling component of the present invention; Figure 5 This is an exploded view of the rotary distributor seat and cooling components of the present invention.

[0020] In the diagram: 1. Rotary distributor seat; 10. Sealing cap; 11. Water pipe; 12. Heat-conducting strip; 13. Mounting groove; 14. Stepped groove; 15. Through hole; 2. Standard oil circuit distributor; 3. Grating seat; 4. Oil circuit adapter seat; 5. Grating; 6. Adjusting shim; 7. Grating mover flange; 8. Worktable oil circuit interface; 9. Barrier component; 91. Annular air circuit; 92. Gap one; 93. Gap two; 94. Connecting pipe; 95. Filter screen. 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] Example 1: Please refer to Figure 1 The present invention provides a technical solution: a direct drive rotary table using a standard double-layer oil circuit distributor, including a rotary distributor seat 1 fixed on the turntable housing. The rotary distributor seat 1 provides a stable installation reference. The standard oil circuit distributor 2 and the grating 5 are fixed on the stationary turntable housing through the rotary distributor seat 1, and the coaxiality and positional accuracy of the subsequent installation of all components are ensured. The rotary distributor seat 1 achieves a rigid connection with the turntable housing through structures such as a stop, locating pin hole, and mounting screw hole, providing a stable mounting reference plane and rotation axis for other structures above the rotary distributor.

[0023] A standard oil distributor 2 for oil supply is installed above the rotary distributor base 1. The standard oil distributor 2 delivers lubricating oil from the stationary turntable housing to the rotating worktable. Using a commercially available standard oil distributor 2 can effectively reduce installation difficulty, design complexity, improve reliability, and facilitate procurement and maintenance.

[0024] The rotating shaft of the standard oil circuit distributor 2 rotates with the worktable, while the stator of the standard oil circuit distributor 2 remains stationary.

[0025] As a further limitation of the present invention, the standard oil circuit distributor 2 is equipped with a precision rotary sealing pair, which includes a graphite ring, a sealing ring, a bearing, etc. The outer shell of the standard oil circuit distributor 2 is fixed on the rotary distributor seat 1. The outer shell of the standard oil circuit distributor 2 is a stator and remains stationary. The rotating shaft of the standard oil circuit distributor 2 is connected to the transmission component above and rotates accordingly. The transmission component includes an oil circuit adapter 4, a mover of the grating 5, an adjusting shim 6, a grating mover flange 7, and a worktable oil circuit interface 8. Lubricating oil enters from the inlet of the housing of the standard oil distributor 2, flows out from the outlet of the rotating shaft through the sealed cavity between the housing and the rotating shaft, thereby achieving dynamic and leak-free fluid transfer.

[0026] A grating mount 3 is installed above the standard oil circuit distributor 2. Specifically, the grating mount 3 is fixed to the top of the standard oil circuit distributor 2 with bolts, so that even in the case of limited space and the standard oil circuit distributor 2 already installed, it can still provide a stable and centered mounting platform for the grating 5.

[0027] It should be further explained that the grating mount 3 is provided with space to avoid the rotating shaft of the standard oil circuit distributor 2, so that the mounting surface of the stator of the grating 5 is perpendicular to the axis of rotation, providing precise centering and stable support for the grating 5.

[0028] A grating 5 for detecting the displacement of the turntable is fixed on the grating base 3. The grating 5 serves as the core precision angle / position measuring element, which detects the rotation angle and position of the turntable in real time and with high precision, forming a closed-loop control.

[0029] As a further limitation of the present invention, the reading head of the grating 5 contains a light source and a photodetector. The mover of the grating 5 is engraved with precise grating lines. When the mover of the grating 5 rotates with the worktable, the grating lines periodically sweep across the reading head, generating an alternating light signal of brightness and darkness. This signal is converted into an electrical signal by the detector and then converted into a high-resolution, high-precision digital pulse signal by the built-in electronic subdivision circuit, which is then fed back to the CNC system.

[0030] The stator of grating 5 reads the displacement of the mover to detect the rotation angle and position of the turntable in real time. The stator of grating 5 is fixed on grating base 3.

[0031] The oil outlet of the standard oil distributor 2 is connected to an oil circuit adapter 4. The oil circuit adapter 4 serves as a connection and distribution node for the fluid pipeline, guiding and distributing the lubricating oil output from the standard oil distributor 2 to various locations that require lubrication, such as the workbench bearing.

[0032] The grating 5 is mounted on the turntable housing via the adjusting shim 6 and the grating mover flange 7. The grating mover flange 7 is used to directly and synchronously transmit the rotational motion of the worktable to the mover of the grating 5.

[0033] One end of the grating mover flange 7 is rigidly connected to the rotation center of the turntable, and the other end of the grating mover flange 7 is used to fix the mover of the grating 5 and the adjusting shim 6. When the turntable rotates, the torque is transmitted to the mover of the grating 5 through the grating mover flange 7 without backlash, ensuring that the measurement and movement are synchronized.

[0034] As a further limitation of the present invention, an oil hole is provided on the grating moving flange 7, which is connected to the oil circuit interface 8 of the worktable for guiding lubricating oil to the rotation center of the worktable.

[0035] The adjusting shim 6 and the mover of the grating 5 are mounted on the grating mover flange 7 to drive the mover of the grating 5 to rotate, and the gap between the mover and the stator of the grating 5 is adjusted by adjusting the adjusting shim 6.

[0036] By selecting adjusting shims 6 of different thicknesses and installing them between the grating mover flange 7 and the grating 5 mover, the axial installation position of the grating 5 mover can be precisely adjusted, thereby adjusting the air gap to the optimal range and ensuring signal strength and accuracy.

[0037] The top of the grating mover flange 7 is fixed with a worktable oil circuit interface 8. The oil supply structure is connected to the rotating structure on the turntable worktable through the worktable oil circuit interface 8 to deliver lubricating oil to the parts that need lubrication.

[0038] The specific implementation of this embodiment is as follows: When the turntable is working, the direct drive motor drives the worktable to rotate. The worktable drives the mover of the grating 5 and the rotating shaft of the standard oil circuit distributor 2 to rotate together through the grating mover flange 7. When the mover of the grating 5 rotates, a relative displacement will be generated between it and the stator of the grating 5. The stator of the grating 5 is a reading head fixed on the grating seat 3. The grating 5 generates a high-precision angle position signal in real time and feeds it back to the control system to form a closed-loop control. As the worktable rotates, it drives the grating mover flange 7 to rotate. Since the grating mover flange 7 is indirectly connected to the rotating shaft of the standard oil distributor 2, it rotates synchronously. The lubricating oil enters the stator of the stationary standard oil distributor 2 from the stationary turntable housing pipeline, and then is transmitted from the oil outlet of the standard oil distributor 2 to the oil circuit adapter 4. Finally, it is delivered to the bearing waiting lubrication components on the rotating worktable through the worktable oil circuit interface 8.

[0039] Example 2: Please refer to Figure 2 and Figure 3 The present invention provides a technical solution: a direct-drive rotary table using a standard double-layer oil circuit distributor. The present invention makes corresponding improvements to the technical problems mentioned in the background art.

[0040] As a further limitation of the present invention, a baffle component 9 is installed on the grating base 3 to prevent cutting fluid and dust from entering the stator of the grating 5. The baffle component 9 includes a connecting pipe 94 for external compressed air to enter, which is installed on the side of the annular air passage 91.

[0041] Clean, dry air is blown upwards through the annular air passage 91, forming an air curtain around the reading head of the grating 5 to prevent cutting fluid and dust from entering.

[0042] The annular air passage 91 is equipped with a filter screen 95 for filtering compressed air to ensure the cleanliness of the compressed air. The surface of the annular air passage 91 is provided with an arc-shaped slit 1 92 and slit 2 93. Slit 1 92 is located outside slit 2 93. The width of both slit 1 92 and slit 2 93 is set to 0.05-0.1mm.

[0043] In this embodiment, the arc of both slit 1 92 and slit 2 93 is 36°. Five slits 1 92 and slit 2 93 are provided and staggered to achieve the integrity of the air curtain and fully surround the reading head of the grating 5.

[0044] Furthermore, the intake pipe is also equipped with a pressure regulating valve and a throttle valve to precisely control the pressure and flow of the air curtain, so as to avoid excessive airflow interfering with the reading of the grating 5 or causing vibration.

[0045] The specific implementation method of this embodiment is as follows: an external air source enters the interior of the annular air passage 91 through the connecting pipe 94, and compressed air is blown upward through the first slit 92 and the second slit 93. The airflow blown out from the multiple first slits 92 and the multiple second slits 93 forms an air curtain to protect the reading head of the grating 5 from being invaded by cutting fluid and dust.

[0046] Example 3: Please refer to Figure 4 and Figure 5 The present invention provides a technical solution: a direct-drive rotary table using a standard double-layer oil circuit distributor. The present invention makes corresponding improvements to the technical problems mentioned in the background art.

[0047] As a further limitation of the present invention, a cooling component for dissipating heat from the motor and bearing is installed on the rotary distributor base 1. The top of the rotary distributor base 1 is provided with a mounting groove 13, and the outer side of the rotary distributor base 1 is provided with a through hole 15 communicating with the mounting groove 13. The cooling component includes a water pipe 11 arranged in a continuous S-bend and a heat-conducting strip 12 installed inside the through hole 15. The water pipe 11 is installed inside the mounting groove 13, and the heat-conducting strip 12 conducts heat away by thermal conduction, thereby reducing thermal deformation of the equipment.

[0048] By using continuous S-bends in the water pipe 11, the contact area and contact time between the cooling water and the metal are increased, thereby improving heat exchange efficiency.

[0049] A stepped groove 14 is provided on the upper end of the outer wall of the rotary distributor seat 1. A sealing cover 10 is threaded onto the stepped groove 14 and fits onto the mounting groove 13 to protect the water pipe 11.

[0050] The specific implementation method of this embodiment is as follows: the water pipe 11 with built-in circulating cold water exchanges heat with the equipment to remove the heat generated by the operation of the equipment, and the heat-conducting strip 12 exchanges heat with the water pipe 11 to discharge the heat.

[0051] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A direct-drive rotary table employing a standard double-layer oil circuit distributor, characterized in that: The system includes a rotary distributor seat (1) fixed on the turntable housing, a standard oil circuit distributor (2) for oil supply installed above the rotary distributor seat (1), a grating seat (3) installed above the standard oil circuit distributor (2), a grating (5) for detecting the displacement of the turntable fixed on the grating seat (3), an oil circuit adapter seat (4) connected to the oil outlet of the standard oil circuit distributor (2), the grating (5) being installed on the turntable housing via an adjusting shim (6) and a grating moving flange (7), and a worktable oil circuit interface (8) fixed on the top of the grating moving flange (7).

2. A direct-drive rotary table using a standard double-layer oil circuit distributor according to claim 1, characterized in that: The standard oil distributor (2) and the grating (5) are fixed on the stationary turntable housing by the rotary distributor seat (1), and the lubricating oil is transported from the stationary turntable housing to the rotating worktable by the standard oil distributor (2).

3. A direct-drive rotary table using a standard double-layer oil circuit distributor according to claim 1, characterized in that: The rotating shaft of the standard oil circuit distributor (2) rotates with the worktable, while the stator of the standard oil circuit distributor (2) remains stationary.

4. A direct-drive rotary table using a standard double-layer oil circuit distributor according to claim 1, characterized in that: The stator of the grating (5) reads the displacement of the mover to detect the rotation angle and position of the turntable in real time. The stator of the grating (5) is fixed on the grating seat (3).

5. A direct-drive rotary table using a standard double-layer oil circuit distributor according to claim 1, characterized in that: The adjusting shim (6) and the mover of the grating (5) are mounted on the grating mover flange (7) to drive the mover of the grating (5) to rotate, and the gap between the mover and the stator of the grating (5) is adjusted by the adjusting shim (6).

6. A direct-drive rotary table using a standard double-layer oil circuit distributor according to claim 1, characterized in that: The oil supply structure is connected to the rotating structure on the turntable via the oil circuit interface (8) of the worktable, so as to deliver lubricating oil to the parts that need lubrication.

7. A direct-drive rotary table using a standard double-layer oil circuit distributor according to claim 1, characterized in that: The grating base (3) is equipped with a baffle component (9) to prevent cutting fluid and dust from entering the stator of the grating (5). The baffle component (9) includes a connecting pipe (94) for external air source to enter, which is installed on the side of the annular air passage (91).

8. A direct-drive rotary table using a standard double-layer oil circuit distributor according to claim 7, characterized in that: The annular air passage (91) is equipped with a filter screen (95) for filtering compressed air. The surface of the annular air passage (91) is provided with an arc-shaped slit one (92) and a slit two (93). The slit one (92) is located outside the slit two (93). The width of the slit one (92) and the slit two (93) is set to 0.05-0.1mm.

9. A direct-drive rotary table using a standard double-layer oil circuit distributor according to claim 1, characterized in that: The rotary distributor seat (1) is equipped with a cooling component for heat dissipation of the motor and bearing. The top of the rotary distributor seat (1) is provided with a mounting groove (13). The outer side of the rotary distributor seat (1) is provided with a through hole (15) communicating with the mounting groove (13). The cooling component includes a water pipe (11) arranged in a continuous S-bend and a heat-conducting strip (12) installed inside the through hole (15). The water pipe (11) is installed inside the mounting groove (13).

10. A direct-drive rotary table employing a standard double-layer oil circuit distributor according to claim 9, characterized in that: The upper end of the outer wall of the rotary distributor seat (1) is provided with a stepped groove (14), and a sealing cap (10) that covers the mounting groove (13) is threaded onto the stepped groove (14).

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