A multi-station metal machining center table

Abstract

The present application relates to the technical field of metal workpiece processing, in particular to a multi-station metal processing center table, comprising a workbench surface on which multiple sets of drilling and milling processing execution ends are arranged, a center clamping base is arranged at the center of the workbench surface, and a spherical linkage inner support centering mechanism is arranged in the base. The mechanism comprises a centering outer seat body with an inner spherical assembly cavity, a rotatable pressure-bearing inner spherical core is arranged in the cavity, a flexible pressure-bearing diaphragm is arranged outside the spherical core to form a closed pressure-bearing space, and an adaptive jacking column is slidably arranged in the radial sliding fit hole of the centering outer seat body. The inflation of the diaphragm can be driven by introducing pressure medium into the inner spherical core, which pushes the jacking column to extend synchronously to realize multi-point inner support centering of sleeve type workpieces; the jacking stroke can be adjusted by rotating the inner spherical core, and the height adjustment structure is matched to adapt to workpieces of multiple specifications. The present application has strong adaptability, high clamping efficiency, and can effectively guarantee the finished product precision and production efficiency of multi-station synchronous processing.

Description

Technical Field

[0001] This invention relates to the field of metal workpiece processing technology, and specifically to a multi-station metal processing center table. Background Technology

[0002] With the automation upgrade in the metal processing industry, multi-station machining centers, with their advantage of completing multiple processes such as drilling and milling simultaneously in a single setup, are widely used in precision machining scenarios for batch parts. Existing multi-station metal processing centers typically have multiple sets of drilling and milling heads arranged on the worktable, and a workpiece positioning mechanism is configured in the center of the worktable to ensure positional consistency during multi-station machining by precisely fixing the workpiece.

[0003] In the machining of cylindrical and sleeve-shaped metal workpieces, the industry commonly uses internal support positioning structures to achieve workpiece centering and clamping. However, existing internal support positioning devices are generally fixed multi-point clamping structures. On the one hand, they have poor adaptability to workpieces with irregular internal cavities, and the clamping force at each positioning point is difficult to control evenly, which easily leads to workpiece centering deviation and insufficient local clamping force, directly affecting the finished product accuracy of multi-station machining. On the other hand, the positioning structure lacks adjustment flexibility, cannot quickly adapt to workpieces with different inner diameter specifications, has low changeover and clamping efficiency, and is difficult to match the production rhythm of high-speed multi-station machining. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention proposes a multi-station metal processing center table, which improves the adaptability of clamping various types of workpieces, optimizes the efficiency of changeover clamping and the stability of equipment operation, and adapts to the needs of multi-station synchronous processing.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A multi-station metal processing center table includes a worktable surface, above which are arranged multiple sets of independently operable drilling and milling execution ends; a central clamping base is provided at the center of the worktable surface, and a spherical linkage internal support centering mechanism is installed in the middle of the central clamping base. The spherical linkage inner support centering mechanism includes a centering outer seat body, an inner spherical assembly cavity is machined inside the centering outer seat body, and a number of radial sliding holes that extend to the inner spherical assembly cavity are opened on the side wall of the centering outer seat body along the radial direction of the spherical surface. Each of the radial sliding holes is slidably fitted with an adaptive top support column. The lower end of the inner spherical assembly cavity is provided with a bottom loading inlet. Inside the inner spherical assembly cavity, a pressure-bearing inner spherical core that can rotate relative to the centering outer seat is installed through the bottom loading inlet. The pressure-bearing inner spherical core is hollow to form a pressure medium cavity. The spherical sidewall of the pressure-bearing inner spherical core is provided with a number of medium diffusion holes that are arranged corresponding to the radial sliding holes. The outer sphere of the pressure-bearing inner ball core is covered with a flexible pressure-bearing diaphragm. The flexible pressure-bearing diaphragm and the pressure-bearing inner ball core are sealed together to form a closed pressure-bearing space. When pressure medium is introduced into the pressure medium cavity, the medium squeezes the flexible pressure-bearing diaphragm outward through the medium diffusion hole, causing the flexible pressure-bearing diaphragm to bulge and deform locally at the corresponding position of the radial sliding hole. The bulging part extends into the inner end of the radial sliding hole and pushes the self-adaptive top support column to extend outward, forming a multi-point top support centering for the workpiece sleeved on the outside of the centering outer seat. The lower end of the pressure-bearing inner ball core extends integrally with a lower mounting column, and the lower mounting column has a medium input channel and a medium return channel that are both connected to the pressure medium cavity.

[0006] Preferably, the adaptive top support column includes a sliding column section, which slides in conjunction with the inner wall of the radial sliding hole; an end limiting ring is fixedly installed at the outer port of the radial sliding hole, and a retraction spring is installed between the sliding column section and the end limiting ring, the retraction spring being used to drive the adaptive top support column to retract inward.

[0007] Preferably, the outer end of the adaptive top support column is formed with a tensioning contact end, and the outer end face of the tensioning contact end is provided with a friction-enhancing texture structure; the outer end of the radial sliding hole is provided with an outer end stepped receiving hole, the end limiting retaining ring is embedded and fixed in the outer end stepped receiving hole, and the tensioning contact end can be retracted into the outer end stepped receiving hole along with the adaptive top support column.

[0008] Preferably, each of the aforementioned medium diffusion holes has a tapered structure that gradually expands from the inside out.

[0009] Preferably, the lower edge of the bottom inlet is formed with a swing-avoidance expansion section to provide space for the lower mounting column to swing with the pressure-bearing inner ball core.

[0010] Preferably, the end of the flexible pressure-bearing diaphragm is provided with an edge sealing sleeve, and the outer spherical edge of the pressure-bearing inner spherical core is provided with an annular insert groove. The edge sealing sleeve is fitted into the annular insert groove, and a pressing sealing ring is also installed in the annular insert groove. The pressing sealing ring presses and fixes the edge sealing sleeve in the annular insert groove.

[0011] Preferably, the end face of the compression sealing ring is provided with a rotation adjustment groove, which is used to cooperate with the tool to drive the compression sealing ring and the pressure-bearing inner ball core to rotate.

[0012] Preferably, the lower end of the lower mounting column is equipped with a height adjustment base. The height adjustment base is used to fix the spherical linkage inner support centering mechanism to the central clamping base and can adjust the vertical installation height of the spherical linkage inner support centering mechanism.

[0013] Preferably, the height adjustment base and the lower mounting column are connected by a thread, and the lower end face of the height adjustment base is provided with a bottom sealing ring groove, in which an annular sealing gasket is embedded.

[0014] Preferably, the inner wall of the inner spherical assembly cavity is provided with a flow equalization buffer groove at the inner end of each radial sliding hole, and the flow equalization buffer groove extends circumferentially along the radial sliding hole.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention utilizes a spherical rotational mating structure between a pressure-bearing inner spherical core and a centering outer seat. By simply rotating the pressure-bearing inner spherical core to adjust the overlapping area of ​​the medium diffusion hole and the radial sliding hole, the extension speed and maximum tensioning stroke of the adaptive top support column can be steplessly adjusted. Without disassembling or replacing any positioning components, it can quickly adapt to workpieces with different inner diameters, significantly shortening workpiece changeover adjustment time and fully matching the high-speed production rhythm of multi-station machining centers. Combined with the vertical height adjustment function of the height-adjustable base, the equipment can also adapt to workpieces of different heights, further expanding the range of workpiece specifications that can be processed.

[0016] In this invention, the adaptive top support column adopts a retraction return spring automatic reset structure, which automatically retracts into the outer end stepped receiving hole after pressure relief, making the workpiece mounting and unmounting operations convenient and the clamping efficiency high; the spherical linkage inner support centering mechanism is a modular integrated structure that can be directly assembled onto the central clamping base, making installation and replacement convenient. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 is a schematic diagram of the external structure of the spherical linkage internal support centering mechanism in an embodiment of the present invention.

[0019] Figure 3 is a schematic diagram of the internal structure of the spherical linkage inner support centering mechanism in an embodiment of the present invention.

[0020] Figure 4 is a magnified schematic diagram of part A in Figure 3.

[0021] Figure 5 is a schematic diagram of the disassembled structure of the pressure-bearing inner sphere core and the flexible pressure-bearing diaphragm in an embodiment of the present invention.

[0022] The attached figures are labeled as follows: 1. Worktable; 2. Drilling and milling execution end; 3. Central clamping base; 4. Spherical linkage internal support centering mechanism; 41. Centering outer seat; 411. Inner spherical assembly cavity; 412. Radial sliding hole; 413. Bottom mounting inlet; 414. Swinging avoidance expansion section; 415. Outer end stepped accommodating hole; 416. Flow equalization buffer groove; 42. Adaptive top support column; 421. Sliding column section; 422. End limit retaining ring; 423. Retraction return spring; 424. 43. Tightening contact end; 43. Pressure-bearing inner ball core; 431. Pressure medium cavity; 432. Medium diffusion hole; 433. Lower mounting column; 434. Medium input channel; 435. Medium return channel; 436. Annular embedded groove; 44. Flexible pressure-bearing diaphragm; 441. Edge sealing sleeve; 45. Press-fit sealing ring; 451. Rotation adjustment groove; 46. Height adjustment base; 461. Bottom sealing ring groove; 462. Annular sealing gasket. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figures 1 to 5 A multi-station metal processing center table is presented, including a worktable 1. Multiple sets of independently operable drilling and milling execution ends 2 are arranged above the worktable 1 according to the processing sequence. Each set of execution ends can complete different processes such as drilling, milling, and tapping, realizing multi-station synchronous processing after the workpiece is clamped once. A central clamping base 3 is fixedly set at the center position of the worktable 1. A spherical linkage internal support centering mechanism 4 is installed in the middle of the central clamping base 3, which is used to perform internal support centering clamping on cylindrical and sleeve-shaped metal workpieces, providing a stable positioning reference for multi-station synchronous processing.

[0025] The spherical linkage inner support centering mechanism 4 uses a centering outer base 41 as the external bearing base. The centering outer base 41 has an inner spherical assembly cavity 411 machined inside, providing assembly and movement space for the internal spherical rotating components. The side wall of the centering outer base 41 has several radial sliding holes 412 that extend to the inner spherical assembly cavity 411 along the radial direction of the spherical surface. The radial sliding holes 412 are evenly arranged along the circumference of the centering outer base 41, providing a sliding guide channel for the adaptive top support column 42, ensuring that the top support action is accurately executed radially. The lower end of the inner spherical assembly cavity 411 has a bottom loading inlet 413, which facilitates the insertion of the pressure-bearing inner spherical core 43 into the inner spherical assembly cavity 411 from below. The pressure-bearing inner spherical core 43 can rotate around the center of the sphere relative to the centering outer base 41 at multiple angles, thereby adjusting the corresponding position of the medium diffusion hole 432 on its spherical side wall and the radial sliding hole 412, realizing flexible adjustment of the top support parameters.

[0026] The inner spherical core 43 is hollow, forming a pressure medium cavity 431, which serves as a temporary storage and distribution space for the pressure medium. The spherical sidewall of the inner spherical core 43 has several medium diffusion holes 432 arranged corresponding to the radial sliding holes 412. Each medium diffusion hole 432 has a tapered structure that gradually expands from the inside to the outside, so that the pressure medium can diffuse evenly after flowing out of the cavity and act smoothly on the flexible pressure-bearing diaphragm 44 on the outside, avoiding stress concentration on the diaphragm due to excessive local flow velocity and extending the service life of the flexible pressure-bearing diaphragm 44. The outer sphere of the pressure-bearing inner ball core 43 is covered with a flexible pressure-bearing diaphragm 44. The flexible pressure-bearing diaphragm 44 and the pressure-bearing inner ball core 43 are sealed together to form a closed pressure-bearing space. When pressure medium is introduced into the pressure medium cavity 431, the medium squeezes the flexible pressure-bearing diaphragm 44 outward through the medium diffusion hole 432, causing the flexible pressure-bearing diaphragm 44 to bulge and deform locally at the corresponding position of the radial sliding hole 412. The bulging part extends into the inner end of the radial sliding hole 412 and pushes the self-adaptive top support column 42 outward, forming a multi-point synchronous top support centering for the workpiece sleeved on the outside of the centering outer seat 41. With the help of the pressure uniformity of the flexible medium, the tension of each top support point can be kept consistent. Even if there is a small irregular deviation in the inner cavity of the workpiece, uniform fitting can be achieved through the self-adaptive deformation of the diaphragm, effectively improving the adaptability to workpieces with irregular inner cavities.

[0027] Both the upper and lower ends of the flexible pressure-bearing diaphragm 44 are provided with annular edge sealing sleeves 441. The upper and lower edges of the outer spherical surface of the pressure-bearing inner ball core 43 are respectively provided with annular embedded grooves 436. The edge sealing sleeves 441 are respectively fitted into the annular embedded grooves 436. A pressure sealing ring 45 is also installed in the annular embedded grooves 436. The pressure sealing ring 45 presses and fixes the edge sealing sleeves 441 to the bottom of the annular embedded grooves 436, thereby achieving a sealed fixation between the flexible pressure-bearing diaphragm 44 and the pressure-bearing inner ball core 43, preventing the pressure medium from leaking from the edge of the diaphragm, and ensuring the stability of the driving pressure. The end face of the pressure sealing ring 45 is provided with a rotating adjustment groove 451, which can be used with a special tool to drive the pressure sealing ring 45 to rotate. On the one hand, it is convenient to disassemble and assemble the pressure sealing ring 45, and to replace and maintain the flexible pressure-bearing diaphragm 44. On the other hand, the pressure sealing ring 45 can drive the pressure-bearing inner ball core 43 to rotate relative to the centering outer seat 41, adjusting the corresponding overlapping area of ​​the medium diffusion hole 432 and the radial sliding hole 412. The larger the overlapping area, the more medium flows in per unit time, and the faster the extension speed and the larger the maximum stroke of the adaptive top support column 42. Conversely, the extension speed is slowed down and the stroke is reduced. This allows for flexible adaptation to the positioning requirements of workpieces with different inner diameter specifications. The changeover adjustment can be completed without replacing the positioning components, effectively improving the changeover efficiency of multi-station processing.

[0028] Each radial sliding hole 412 is slidably fitted with an adaptive top support column 42. The adaptive top support column 42 includes a sliding column section 421, which slides in contact with the inner wall of the radial sliding hole 412 to ensure smooth radial reciprocating motion of the top support column. An end limiting retaining ring 422 is fixedly installed at the outer port of the radial sliding hole 412. An outer end stepped receiving hole 415 is opened at the outer end of the radial sliding hole 412. The end limiting retaining ring 422 is embedded and fixed in the outer end stepped receiving hole 415. A retraction return spring 423 is installed between the sliding column section 421 and the end limiting retaining ring 422. The retraction return spring 423 is normally in a compressed state. When the pressure medium is depressurized, the elastic force of the retraction return spring 423 can drive the adaptive top support column 42 to return inward. No additional reset drive structure is required, simplifying the overall structural design.

[0029] The outer end of the adaptive top support column 42 is formed with a clamping contact end 424. The outer end face of the clamping contact end 424 is provided with a friction-enhancing texture structure, which can increase the clamping friction with the inner wall of the workpiece, prevent the workpiece from moving around in the circumferential direction during processing, and ensure positioning stability. The clamping contact end 424 can be retracted into the outer end stepped receiving hole 415 along with the adaptive top support column 42, so that the outer surface of the centering outer seat 41 remains flat, which facilitates the installation and removal of the workpiece and avoids scratching and jamming during the installation and removal process.

[0030] The inner wall of the inner spherical assembly cavity 411 is provided with a flow equalization buffer groove 416 at the inner end of each radial sliding hole 412. The flow equalization buffer groove 416 extends circumferentially along the radial sliding hole 412. On the one hand, it can limit the expansion and deformation range of the flexible pressure bearing diaphragm 44, constrain the maximum expansion amplitude of the diaphragm, and prevent the diaphragm from being damaged due to excessive deformation. On the other hand, it can provide a buffer flow space for the medium flowing out of the medium diffusion hole 432, so that the pressure medium is evenly distributed circumferentially at the inner end of the sliding hole, ensuring that the medium pressure at each radial sliding hole 412 position is uniform and consistent, thereby improving the synchronization of multi-point support and avoiding the problem of workpiece centering offset caused by uneven support force at a single point.

[0031] The lower end of the pressure-bearing inner ball core 43 extends integrally with a lower mounting column 433. The lower mounting column 433 has a medium input channel 434 and a medium return channel 435, both communicating with the pressure medium cavity 431, used for the supply and recovery of external pressure medium, respectively, to achieve cyclic supply and pressure regulation of the pressure medium. The lower edge of the bottom inlet 413 has a swing-avoidance expansion section 414, which expands outward circumferentially along the bottom inlet 413, providing ample space for the lower mounting column 433 to swing with the pressure-bearing inner ball core 43. This prevents structural interference between the lower mounting column 433 and the centering outer seat 41 during the rotation adjustment of the pressure-bearing inner ball core 43, ensuring smooth angle adjustment.

[0032] A height adjustment base 46 is fitted to the lower end of the lower mounting column 433. The height adjustment base 46 is fixedly installed in the middle of the central clamping base 3 and is used to support the entire spherical linkage internal support centering mechanism 4. The height adjustment base 46 and the lower mounting column 433 are connected by threads. The vertical installation height of the spherical linkage internal support centering mechanism 4 can be adjusted by rotating the lower mounting column 433, thereby adapting to workpieces of different heights and sizes. The adjustment method is simple and convenient, and no additional adjusting shims are required. A bottom sealing ring groove 461 is opened on the lower end face of the height adjustment base 46. An annular sealing gasket 462 is embedded in the bottom sealing ring groove 461 to ensure the sealing performance of the mounting joint surface between the height adjustment base 46 and the central clamping base 3, prevent the pressure medium from leaking from the installation part, and improve the reliability of equipment operation.

[0033] In actual operation, the sleeve-shaped workpiece to be processed is smoothly installed from above the centering outer seat 41. Then, pressure medium is introduced into the pressure medium cavity 431 through the medium input channel 434. The pressure medium flows out evenly through each medium diffusion hole 432, squeezing the flexible pressure bearing diaphragm 44 to produce local bulging at the corresponding radial sliding hole 412 position. The bulging diaphragm pushes each adaptive top support column 42 to extend outward synchronously along the radial sliding hole 412 until the contact end 424 is tightly supported and stably abuts against the inner wall of the workpiece. Relying on the uniform medium pressure, multi-point synchronous internal support centering is achieved, and the clamping and fixing of the workpiece is completed.

[0034] After clamping, multiple sets of drilling and milling execution ends 2 above the worktable 1 start synchronously and perform drilling, milling and other processing operations on different parts of the workpiece according to the preset process. The uniform multi-point clamping force during the processing can ensure the stability of the workpiece position and prevent displacement or vibration, thus ensuring the consistency of accuracy in multi-station processing.

[0035] After processing, the pressure medium is depressurized and recovered through the medium return channel 435, the bulging deformation of the flexible pressure-bearing diaphragm 44 gradually subsides, and the adaptive top support column 42 retracts inward under the elastic force of the retraction return spring 423, and the tightened contact end 424 is completely retracted into the outer end step cavity 415. At this time, the outer surface of the centering outer seat 41 returns to a flat state, and the processed workpiece can be smoothly removed from the centering outer seat 41, completing a complete processing cycle.

[0036] The terms "upper," "lower," "outer," "inner," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish relative positional relationships and are not necessarily qualitative. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0037] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-station metal machining center table, comprising a worktable surface, wherein multiple sets of independently operable drilling and milling machining actuators are arranged above the worktable surface; characterized in that: A central clamping base is provided at the center of the workbench, and a spherical linkage internal support centering mechanism is installed in the middle of the central clamping base. The spherical linkage inner support centering mechanism includes a centering outer seat body, an inner spherical assembly cavity is machined inside the centering outer seat body, and a number of radial sliding holes that extend to the inner spherical assembly cavity are opened on the side wall of the centering outer seat body along the radial direction of the spherical surface. Each of the radial sliding holes is slidably fitted with an adaptive top support column. The lower end of the inner spherical assembly cavity is provided with a bottom loading inlet. Inside the inner spherical assembly cavity, a pressure-bearing inner spherical core that can rotate relative to the centering outer seat is installed through the bottom loading inlet. The pressure-bearing inner spherical core is hollow to form a pressure medium cavity. The spherical sidewall of the pressure-bearing inner spherical core is provided with a number of medium diffusion holes that are arranged corresponding to the radial sliding holes. The outer sphere of the pressure-bearing inner ball core is covered with a flexible pressure-bearing diaphragm. The flexible pressure-bearing diaphragm and the pressure-bearing inner ball core are sealed together to form a closed pressure-bearing space. When pressure medium is introduced into the pressure medium cavity, the medium squeezes the flexible pressure-bearing diaphragm outward through the medium diffusion hole, causing the flexible pressure-bearing diaphragm to bulge and deform locally at the corresponding position of the radial sliding hole. The bulging part extends into the inner end of the radial sliding hole and pushes the self-adaptive top support column to extend outward, forming a multi-point top support centering for the workpiece sleeved on the outside of the centering outer seat. The lower end of the pressure-bearing inner ball core extends integrally with a lower mounting column, and the lower mounting column has a medium input channel and a medium return channel that are both connected to the pressure medium cavity.

2. The multi-station metal processing center table as described in claim 1, characterized in that: The adaptive top support column includes a sliding column section, which slides in conjunction with the inner wall of the radial sliding hole; an end limiting ring is fixedly installed at the outer port of the radial sliding hole, and a retraction spring is installed between the sliding column section and the end limiting ring, which is used to drive the adaptive top support column to retract inward.

3. The multi-station metal processing center table as described in claim 2, characterized in that: The outer end of the adaptive top support column is formed with a tensioning contact end, and the outer end face of the tensioning contact end is provided with a friction-enhancing texture structure; the outer end of the radial sliding hole is provided with an outer end stepped receiving hole, and the end limiting retaining ring is embedded and fixed in the outer end stepped receiving hole, and the tensioning contact end can be retracted into the outer end stepped receiving hole along with the adaptive top support column.

4. The multi-station metal processing center table as described in claim 1, characterized in that: Each of the aforementioned medium diffusion holes has a tapered structure that gradually expands from the inside out.

5. The multi-station metal processing center table as described in claim 1, characterized in that: The lower edge of the bottom inlet is formed with a swing-avoidance expansion section to provide space for the lower mounting column to swing with the pressure-bearing inner ball core.

6. The multi-station metal processing center table as described in claim 1, characterized in that: The flexible pressure-bearing diaphragm is provided with an edge sealing sleeve at its end. The outer spherical edge of the pressure-bearing inner spherical core is provided with an annular insert groove. The edge sealing sleeve is fitted into the annular insert groove. A pressing sealing ring is also installed in the annular insert groove. The pressing sealing ring presses and fixes the edge sealing sleeve in the annular insert groove.

7. The multi-station metal processing center table as described in claim 6, characterized in that: The end face of the compression sealing ring is provided with a rotation adjustment groove, which is used to cooperate with the tool to drive the compression sealing ring and the pressure-bearing inner ball core to rotate.

8. The multi-station metal processing center table as described in claim 1, characterized in that: The lower end of the lower mounting column is equipped with a height adjustment base. The height adjustment base is used to fix the spherical linkage inner support centering mechanism to the central clamping base and can adjust the vertical installation height of the spherical linkage inner support centering mechanism.

9. The multi-station metal processing center table as described in claim 8, characterized in that: The height adjustment base and the lower mounting column are connected by threads. The lower end face of the height adjustment base is provided with a bottom sealing ring groove, and an annular sealing gasket is embedded in the bottom sealing ring groove.

10. The multi-station metal processing center table as described in any one of claims 1 to 9, characterized in that: The inner wall of the inner spherical assembly cavity is provided with a flow equalization buffer groove at the inner end of each radial sliding hole, and the flow equalization buffer groove extends circumferentially along the radial sliding hole.

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