Rotary table with double oil passage distributor

Abstract

This invention discloses a rotary table with a double-layer oil circuit distributor, relating to the field of precision CNC equipment technology. It includes a double-layer oil circuit distributor body, a grating integrated assembly, and a central water outlet assembly. The double-layer oil circuit distributor body consists of a distributor central shaft, a distributor intermediate sleeve, and a distributor outer sleeve. The distributor central shaft and the distributor outer sleeve are fixed components. This invention adopts a double-layer oil circuit distributor body structure, dividing multiple oil circuits into two independently arranged layers: an inner oil circuit and an outer oil circuit. This completely eliminates the need for the long shaft design required by traditional single-layer oil circuit distributors in multi-oil circuit scenarios. The distributor central shaft adopts a short shaft structure, and the sealing ring groove on the shaft is designed as a shallow groove structure, significantly reducing the machining difficulty of the central shaft and effectively avoiding the problem of burrs easily generated during deep groove machining. This prevents the sealing ring from being scratched or damaged by burrs during assembly, significantly improving sealing reliability.

Description

Technical Field

[0001] This invention relates to the field of precision CNC equipment technology, specifically a rotary table with a double-layer oil circuit distributor. Background Technology

[0002] Rotary worktables are core actuators in precision CNC machining and automated rotary equipment. They require a hydraulic distributor to dynamically distribute and deliver working media such as hydraulic oil and compressed air, and often need to integrate grating detection components to achieve high-precision angle positioning and closed-loop control. Therefore, we propose a rotary worktable with a double-layer hydraulic distributor.

[0003] Currently, rotary tables generally adopt a single-layer oil circuit distributor structure. When the number of oil circuit channels required by the worktable exceeds eight, the distributor's central shaft must be designed as a long shaft structure to meet the needs of multi-oil circuit arrangement. This brings a series of technical defects. The long central shaft is difficult to process, the sealing ring installation groove on the shaft is too deep, and burrs are easily generated during the processing. The sealing ring is easily scratched and damaged by burrs during assembly, resulting in medium leakage and sealing failure. The long shaft structure has extremely high requirements for the machining accuracy of parts and the coaxiality of assembly. It is difficult to install and debug, and the consistency of mass production is poor. The excessive length of the central shaft will increase the axial space occupied, which is not conducive to the overall compact design of the worktable. At the same time, the existing rotary table's grating detection components are mostly arranged separately from the oil circuit distributor, which has problems such as loose structure, large space occupation, large grating size, high cost, and inconvenient disassembly and maintenance. It cannot achieve efficient integration of multi-oil circuit distribution and precision angle detection.

[0004] In summary, traditional single-layer oil circuit distributors have problems such as difficult processing and installation, poor sealing reliability, inconvenient maintenance, and low integration in multi-oil circuit scenarios, making it difficult to meet the usage requirements of modern precision rotary tables for multi-channel, high integration, easy processing, and easy maintenance. Summary of the Invention

[0005] The purpose of this invention is to provide a rotary table with a 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 rotary worktable with a double-layer oil circuit distributor, comprising a double-layer oil circuit distributor body, a grating integrated assembly, and a central water outlet assembly. The double-layer oil circuit distributor body is composed of a distributor central shaft, a distributor intermediate sleeve, and a distributor outer sleeve. The distributor central shaft and the distributor outer sleeve are fixed components, and the distributor intermediate sleeve can rotate relative to the distributor central shaft and the distributor outer sleeve. The distributor's central shaft has independent inner and outer oil passages. The inner oil passage is connected to the inner oil groove of the distributor's intermediate sleeve, and the outer oil passage is connected to the outer oil groove of the distributor's intermediate sleeve through an oil passage pin. The grating integrated assembly is mounted on the body of the double-layer oil circuit distributor, and the central water outlet assembly is connected to the central shaft and the central water outlet shaft of the distributor.

[0007] Preferably, a first deep groove ball bearing, a second deep groove ball bearing, and a third deep groove ball bearing are assembled between the central shaft of the distributor and the intermediate sleeve of the distributor, and between the intermediate sleeve of the distributor and the outer sleeve of the distributor.

[0008] Preferably, a grinding shim is provided between the first deep groove ball bearing, the second deep groove ball bearing, and the third deep groove ball bearing. The grinding shim is used to adjust the bearing assembly clearance and axial positioning.

[0009] Preferably, the grating integrated assembly includes a grating mover support, a grating base, and a circular grating. The grating base is fixedly connected to the central axis of the distributor, and the grating mover support is fixedly connected to the intermediate sleeve of the distributor and rotates synchronously.

[0010] Preferably, the bottom of the distributor's central shaft is provided with a medium input connector. After hydraulic oil or compressed air enters through the connector, it flows into the inner oil passage and the outer oil passage respectively through two paths.

[0011] Preferably, the inner and outer oil grooves of the distributor intermediate sleeve are both annular sealed oil grooves. The two oil paths converge through the corresponding oil grooves and are connected to the oil path flange through the grating mover support.

[0012] Preferably, the main body of the dual-layer oil circuit distributor is an independent pre-assembled component that can be assembled as a whole onto the rotary table body.

[0013] Preferably, the water path of the central water outlet component is independent of the oil path of the double-layer oil distributor body, and is only connected to the central water outlet shaft through the internal channel of the distributor's central shaft.

[0014] Preferably, the circular grating is a small circular grating, which is assembled on the grating base with a detachable structure.

[0015] Preferably, the central shaft of the distributor has a short shaft structure, and the sealing ring groove on the shaft has a shallow groove structure.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention adopts a double-layer oil circuit distributor main structure, dividing multiple oil circuits into two independently arranged inner and outer oil circuits. This completely eliminates the long shaft design required by traditional single-layer oil circuit distributors in multi-oil circuit scenarios. The distributor's central shaft adopts a short shaft structure, and the sealing ring groove on the shaft is designed as a shallow groove structure, which greatly reduces the machining difficulty of the central shaft and effectively avoids the problem of burrs easily generated during deep groove machining. This prevents the sealing ring from being scratched or damaged by burrs during assembly, significantly improving sealing reliability and reducing the risk of leakage of working media such as hydraulic oil and compressed air. At the same time, the short shaft structure has more relaxed requirements for the machining accuracy of parts and the coaxiality of assembly, reducing the difficulty of installation and debugging, improving the consistency of mass production, and greatly reducing the axial space occupied. This helps the rotary worktable achieve an overall compact design, adapting to the miniaturization development needs of modern precision equipment.

[0017] 2. This invention directly assembles the grating integration component onto the main body of the double-layer oil circuit distributor, achieving efficient integration of multi-oil circuit distribution and precise angle detection. This solves the problems of loose structure and large space occupation caused by the separate arrangement of the grating detection component and the oil circuit distributor in the prior art. At the same time, it adopts a small circular grating and is designed as a detachable structure to be assembled on the grating seat. Compared with the traditional large grating, it not only reduces the production cost, but also facilitates the disassembly, maintenance and replacement of the grating. The grating mover support is fixedly connected to the distributor intermediate sleeve and rotates synchronously. The grating seat is fixed to the distributor central axis, which can detect the rotation angle of the distributor intermediate sleeve in real time and thus realize high-precision angle positioning and closed-loop control of the rotary table, improving the processing accuracy and operation stability of the table.

[0018] 3. The main body of the double-layer oil circuit distributor of this invention is designed as an independent pre-assembled component. It can be pre-assembled and debugged before assembly, and then assembled onto the rotary table body, significantly improving the assembly efficiency of the worktable. For subsequent maintenance, the main body of the double-layer oil circuit distributor can be completely disassembled without disassembling other parts of the worktable, reducing maintenance difficulty and cost. Simultaneously, the water circuit of the central water outlet component is independent of the oil circuit of the double-layer oil circuit distributor body, connected only to the central water outlet shaft through an internal channel of the distributor's central shaft. This achieves independent delivery of the oil and water circuits without interference, ensuring stable distribution of the working medium and meeting the central water outlet requirement of the worktable. This expands the applicable scenarios of the worktable and can be adapted to more precision CNC machining conditions. Furthermore, by setting grinding shims between each deep groove ball bearing, the bearing assembly clearance and axial positioning can be flexibly adjusted, further improving the rotational flexibility and structural stability of the double-layer oil circuit distributor body and extending the service life of the equipment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2This is a side sectional view of a partial structure in this invention; Figure 3 This is a first side sectional view of a partial structure in this invention; Figure 4 In this invention Figure 3 Enlarged view of the local structure at point A in the middle; Figure 5 This is a second side sectional view of a partial structure in this invention; Figure 6 In this invention Figure 5 Enlarged view of the local structure at point B; Figure 7 This is a third side sectional view of a partial structure in this invention; Figure 8 In this invention Figure 7 Magnification of the local structure at point C.

[0020] In the diagram: 1. Main body of the double-layer oil circuit distributor; 2. Intermediate sleeve of the distributor; 3. Outer sleeve of the distributor; 4. Oil circuit pin; 5. First deep groove ball bearing; 6. Second deep groove ball bearing; 7. Third deep groove ball bearing; 8. Grinding shim; 9. Grating mover support seat; 10. Grating seat; 11. Circular grating; 12. Oil circuit flange; 13. Central water outlet shaft; 14. Central shaft of the distributor. 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 Figures 1-8 This invention provides a technical solution: a rotary worktable with a double-layer oil circuit distributor, comprising a double-layer oil circuit distributor body 1, a grating integrated assembly, and a central water outlet assembly. The core assembly process is as follows: First, the main body 1 of the double-layer oil circuit distributor is pre-assembled independently. The distributor central shaft 14, the distributor intermediate sleeve 2, and the distributor outer sleeve 3 are taken as core components. First, a shallow groove structure sealing ring groove is machined at the corresponding position on the outer wall of the distributor central shaft 14, and a suitable sealing ring is installed to ensure sealing performance while avoiding scratches on the sealing ring caused by burrs generated by deep groove machining. Then, the first deep groove ball bearing 5, the grinding shim 8, and the second deep groove ball bearing 6 are sequentially installed between the distributor central shaft 14 and the distributor intermediate sleeve 2. The third deep groove ball bearing 7 is installed between the distributor intermediate sleeve 2 and the distributor outer sleeve 3, and the grinding shim 8 is added between the third deep groove ball bearing 7 and the second deep groove ball bearing 6. By adjusting the thickness of the grinding shim 8, the assembly clearance of each bearing is precisely adjusted to achieve axial positioning and ensure that the distributor intermediate sleeve 2 can rotate flexibly relative to the distributor central shaft 14 and the distributor outer sleeve 3 without jamming.

[0023] After pre-assembly, a sealing test is performed on the main body 1 of the double-layer oil circuit distributor. Hydraulic oil is injected through the medium input connector at the bottom of the distributor's central shaft 14. After entering through the connector, the hydraulic oil flows into the inner oil circuit and the outer oil circuit respectively. The inner oil circuit is directly connected to the inner annular sealing oil groove of the distributor's intermediate sleeve 2, and the outer oil circuit penetrates the side wall of the distributor's intermediate sleeve 2 through the oil circuit pin 4 and connects to the outer annular sealing oil groove. The two oil circuits are observed for leakage. After confirming that the sealing is reliable, the pre-assembly of the main body 1 of the double-layer oil circuit distributor is completed.

[0024] Next, the grating integration assembly is assembled. The grating seat 10 is fixedly connected to the top of the distributor central shaft 14 with bolts, ensuring that the grating seat 10 and the distributor central shaft 14 are coaxial. Then, the small circular grating 11 is assembled onto the grating seat 10 through a detachable snap-fit ​​structure, which facilitates subsequent disassembly and maintenance. The grating mover support seat 9 is fixed to the top of the distributor intermediate sleeve 2 through a key connection, so that the grating mover support seat 9 can rotate synchronously with the distributor intermediate sleeve 2. The grating mover on the grating mover support seat 9 is aligned with the circular grating 11 to ensure detection accuracy.

[0025] Finally, the central water outlet assembly and overall assembly are carried out. The central water outlet shaft 13 is connected to the independent water channel inside the central shaft 14 of the distributor through a sealing joint to ensure that the water channel and the oil channel of the double-layer oil channel distributor body 1 do not interfere with each other. Then, the pre-assembled double-layer oil channel distributor body 1 is assembled to the rotary table body with bolts. The outer sleeve 3 of the distributor is fixed to the worktable body. The oil channel interface on the grating mover support 9 is connected to the oil channel flange 12 to complete the assembly of the entire rotary table.

[0026] The specific implementation method of this embodiment is as follows: After assembly, the rotary worktable is started. The distributor intermediate sleeve 2 rotates synchronously with the main spindle of the worktable. The distributor central shaft 14 and the distributor outer sleeve 3 remain fixed. Hydraulic oil or compressed air enters the distributor central shaft 14 through the medium input connector and is delivered to the inner and outer oil grooves of the distributor intermediate sleeve 2 through the inner and outer oil circuits respectively. Then, it is distributed to each execution component of the worktable through the oil circuit flange 12 to achieve stable delivery of multi-channel media. In the grating integrated assembly, the circular grating 11 is fixed with the distributor central shaft 14, and the grating mover support 9 rotates with the distributor intermediate sleeve 2. The grating mover detects the scale of the circular grating 11 in real time and transmits the angle signal to the control system to achieve high-precision angle positioning and closed-loop control of the worktable. The central water outlet assembly outputs cooling water through the central water outlet shaft 13 according to the processing requirements to cool the processing tools and workpieces. The oil circuit and water circuit operate independently and do not interfere with each other, ensuring a stable and reliable processing process.

[0027] Example 2: Please refer to Figures 1-8 The present invention provides a technical solution: a rotary worktable with a double-layer oil circuit distributor. The present invention makes corresponding improvements to the technical problems mentioned in the background art. Based on the previous embodiment, this embodiment focuses on optimizing the processing and assembly accuracy of the double-layer oil circuit distributor body 1, and is suitable for high-precision CNC machining scenarios.

[0028] As a further limitation of the present invention, the distributor central shaft 14 is made of chromium (Cr) material. After being heat-treated, it is precision ground. The short shaft structure design significantly reduces the processing difficulty compared to the traditional long shaft. The sealing ring groove on the shaft body is a shallow groove structure. During processing, a precision milling and polishing process is used to completely avoid the generation of burrs. The sealing ring is made of a material suitable for high-pressure medium transportation. During assembly, a special tooling is used to assist in the installation to prevent the sealing ring from being scratched. The inner and outer oil grooves of the distributor intermediate sleeve 2 are both annular sealing oil grooves. The inner wall of the oil groove is polished to reduce the resistance of medium flow. At the same time, stepped sealing grooves are set on both sides of the oil groove, and double sealing rings are installed to further improve the sealing reliability.

[0029] During assembly, the grinding shim 8 is first precision machined. The thickness of the grinding shim 8 is precisely adjusted according to the bearing model and assembly clearance requirements. During the assembly process, the axial movement of the bearing is monitored using a testing tool to ensure the rotation accuracy of the distributor intermediate sleeve 2. In the grating integrated assembly, the circular grating 11 is a small circular grating. During assembly, the gap between the circular grating 11 and the grating mover is adjusted to ensure the angle detection accuracy and meet the positioning requirements of high-precision machining.

[0030] During operation, hydraulic oil or compressed air enters the central shaft 14 of the distributor through the medium input connector. Due to the independent arrangement of the double-layer oil circuit, different media can be transported simultaneously, adapting to complex processing conditions. The rotation speed of the intermediate sleeve 2 of the distributor can be flexibly adjusted according to processing requirements. The bearing is lubricated with a suitable grease, and the grease is replenished regularly to extend the service life of the equipment. When maintenance is required, the connecting bolts between the double-layer oil circuit distributor body 1 and the workbench body can be directly removed, and the entire double-layer oil circuit distributor body 1 can be taken out as a whole without disassembling other parts of the workbench, reducing the difficulty of maintenance.

[0031] Example 3: Please refer to Figures 1-8 The present invention provides a technical solution: a rotary worktable with a double-layer oil circuit distributor. The present invention makes corresponding improvements to the technical problems mentioned in the background art. Based on the previous embodiments, this embodiment optimizes the compactness and adaptability of the overall structure and is suitable for small precision CNC equipment.

[0032] As a further limitation of the present invention, the main body 1 of the double-layer oil circuit distributor adopts a short shaft structure design, which significantly reduces the axial space occupied compared with the traditional structure, helping the rotary worktable to achieve an overall compact design. The outer sleeve 3 of the distributor is made of a lightweight material that ensures structural strength, reducing the overall weight. The grating integrated component adopts an integrated design, and the connection between the grating seat 10 and the distributor central shaft 14 adopts an integrated processing technology to reduce assembly errors. The grating mover support seat 9 and the distributor intermediate sleeve 2 adopt a reinforced structure connection to ensure a firm connection and prevent loosening during rotation. The water channel of the central water outlet component can adjust the cooling water flow according to processing requirements. The water interface adopts a quick connector for easy disassembly and installation.

[0033] The specific implementation method of this embodiment is as follows: During the independent pre-assembly of the dual-layer oil circuit distributor body 1, special tooling is used to position and clamp the distributor central shaft 14, the distributor intermediate sleeve 2, and the distributor outer sleeve 3 to ensure the coaxiality of the three. After the pre-assembly is completed, a dynamic balance test is performed to avoid vibration when the worktable rotates, which would affect the machining accuracy. When assembling to the worktable body, the distributor outer sleeve 3 is positioned with the mounting surface of the worktable by a positioning pin to ensure assembly accuracy. The oil circuit flange 12 adopts an integrated structure to meet the media requirements of multiple actuators.

[0034] During operation, when the circular grating 11 needs to be replaced, simply remove the clips on the grating seat 10 to remove the circular grating 11 without disassembling the entire grating integrated assembly, making maintenance convenient. The cooling water of the central water outlet assembly is transported to the central water outlet shaft 13 through the internal channel of the distributor central shaft 14 and sprayed directly onto the processing area, effectively reducing the processing temperature and minimizing workpiece deformation. The oil circuit of the double-layer oil circuit distributor body 1 adopts a diversion design, which can adjust the medium flow rate through the oil circuit valves according to the needs of each actuator to achieve precise distribution. When a medium leak occurs, the leak point can be quickly located by observing the sealing part of the double-layer oil circuit distributor body 1. Since the double-layer oil circuit is independently sealed, a leak in one place will not affect the normal operation of the other oil circuit, improving the reliability of the equipment.

[0035] 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.

[0036] 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 rotary worktable with a double-layer oil circuit distributor, comprising a double-layer oil circuit distributor body (1), a grating integrated assembly, and a central water outlet assembly, characterized in that: The main body (1) of the double-layer oil circuit distributor is composed of a distributor central shaft (14), a distributor intermediate sleeve (2), and a distributor outer sleeve (3). The distributor central shaft (14) and the distributor outer sleeve (3) are fixed parts, and the distributor intermediate sleeve (2) can rotate relative to the distributor central shaft (14) and the distributor outer sleeve (3). The distributor's central shaft (14) has independent inner and outer oil passages. The inner oil passage is connected to the inner oil groove of the distributor's intermediate sleeve (2), and the outer oil passage is connected to the outer oil groove of the distributor's intermediate sleeve (2) through the oil passage pin (4). The grating integrated assembly is mounted on the body (1) of the double-layer oil circuit distributor, and the central water outlet assembly is connected to the central shaft (14) and the central water outlet shaft (13) of the distributor.

2. A rotary worktable with a double-layer oil circuit distributor according to claim 1, characterized in that: The distributor central shaft (14) and the distributor intermediate sleeve (2) are each equipped with a first deep groove ball bearing (5), a second deep groove ball bearing (6), and a third deep groove ball bearing (7).

3. A rotary worktable with a double-layer oil circuit distributor according to claim 2, characterized in that: A grinding shim (8) is provided between the first deep groove ball bearing (5), the second deep groove ball bearing (6) and the third deep groove ball bearing (7). The grinding shim (8) is used to adjust the bearing assembly clearance and axial positioning.

4. A rotary worktable with a double-layer oil circuit distributor according to claim 1, characterized in that: The grating integrated assembly includes a grating mover support (9), a grating seat (10), and a circular grating (11). The grating seat (10) is fixedly connected to the central shaft (14) of the distributor, and the grating mover support (9) is fixedly connected to the intermediate sleeve (2) of the distributor and rotates synchronously.

5. A rotary worktable with a double-layer oil circuit distributor according to claim 1, characterized in that: The distributor's central shaft (14) has a medium input connector at its bottom. Hydraulic oil or compressed air enters through the connector and flows into the inner oil passage and the outer oil passage respectively through two paths.

6. A rotary worktable with a double-layer oil circuit distributor according to claim 1, characterized in that: The inner and outer oil grooves of the distributor intermediate sleeve (2) are both annular sealed oil grooves. After the two oil paths converge through the corresponding oil grooves, they are connected to the oil path flange (12) through the grating mover support seat (9).

7. A rotary worktable with a double-layer oil circuit distributor according to claim 1, characterized in that: The main body (1) of the double-layer oil circuit distributor is an independent pre-assembled component that can be assembled as a whole onto the rotary table body.

8. A rotary worktable with a double-layer oil circuit distributor according to claim 1, characterized in that: The water path of the central water outlet component is independent of the oil path of the double-layer oil distributor body (1), and is connected to the central water outlet shaft (13) only through the internal channel of the distributor central shaft (14).

9. A rotary worktable with a double-layer oil circuit distributor according to claim 4, characterized in that: The circular grating (11) is a small circular grating, which is assembled on the grating base (10) with a detachable structure.

10. A rotary worktable with a double-layer oil circuit distributor according to claim 1, characterized in that: The distributor's central shaft (14) has a short shaft structure, and the sealing ring groove on the shaft has a shallow groove structure.

Images