Grinding head capable of reducing stress concentration

Abstract

The utility model belongs to the technical field of grinding heads, and particularly relates to a grinding head capable of reducing stress concentration, which comprises a shell assembly, a rotating mechanism and a plurality of grinding block foot assemblies. The rotating mechanism is arranged in the shell assembly, and the multiple grinding block foot assemblies are arranged outside the shell assembly in a surrounding mode and used for grinding operation. The rotating mechanism drives the grinding block foot assemblies to integrally rotate and periodically drives the grinding block foot assemblies to independently swing through eccentric transmission. The rotating mechanism comprises a rotating shaft, an eccentric shaft sleeve, a stacked gear and an outer gear, the rotating shaft is installed in the shell assembly, the eccentric shaft sleeve is arranged on the rotating shaft in a sleeving mode to form eccentric rotation, the stacked gear comprises a first gear ring and a second gear ring, and the first gear ring is eccentrically meshed with the outer gear so that the first gear ring can revolve around the rotating shaft and rotate. The second gear ring is arranged at the bottom of the stacked gear, and the grinding block foot driving gears of the multiple grinding block foot assemblies are meshed with the second gear ring to achieve independent swinging. The stress structure of the grinding head is optimized, stress concentration is reduced, stability and durability are improved, and grinding uniformity is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of grinding head, more particularly, relate to a kind of grinding head that reduces stress concentration. BACKGROUND

[0002] In the grinding equipment, the grinding disc is an important component for supporting and driving the eccentric grinding motion of the grinding head reducing stress concentration, and its performance directly affects the grinding accuracy and service life of the equipment. The current grinding equipment usually adopts a structure design based on grinding shaft, sliding block and wheel disc to realize the swing motion of the grinding head reducing stress concentration.

[0003] In the existing grinding disc structure, the grinding shaft is usually provided with a protrusion, which is inserted into the relief hole on the sliding block, thereby completing the connection of the grinding head reducing stress concentration and the sliding block, and relying on the eccentric motion of the wheel disc to drive the grinding head reducing stress concentration to swing. This design can meet the grinding requirements in the short term, but there are certain defects in the long-term use.

[0004] Firstly, since the grinding shaft needs to rotate at high speed and bear continuous lateral impact during the grinding process, the matching relationship between the protrusion and the relief hole will gradually loosen or wear with the increase of use time. This looseness may cause the swing trajectory of the grinding head reducing stress concentration to deviate, thereby affecting the grinding accuracy, and may cause uneven grinding of the workpiece surface. In addition, the protrusion inserted into the relief hole makes the stress concentrated in the contact area of the protrusion, and under the action of long-time high-frequency vibration and alternating load, stress concentration is easy to occur, increasing the risk of material fatigue damage, and thus affecting the overall stability and durability of the grinding equipment.

[0005] Secondly, the existing grinding disc structure usually does not consider lubrication measures, and there is a lot of friction among the components such as grinding shaft, sliding block and wheel disc during long-term operation, especially under high load and high speed grinding conditions. This friction will exacerbate the wear of the surface of the components, further shorten the service life of the connection part. If effective lubrication means is not taken, the equipment may need frequent maintenance or replacement of parts, increasing the use cost.

[0006] In summary, the existing grinding equipment still has room for improvement in the connection stability, stress distribution and lubrication conditions of the grinding head reducing stress concentration. Therefore, how to optimize the connection structure of the grinding head reducing stress concentration, improve the overall durability, and introduce effective lubrication scheme to reduce wear and improve grinding accuracy, is a problem to be solved in the current technical field. UTILITY MODEL CONTENTS

[0007] The utility model discloses to a kind of grinding head for reducing stress concentration, by optimizing gear meshing mode, balancing axial force, introducing lubricating oil channel and the independent swing mechanism of abrasive block foot assembly, reduce stress concentration, improve durability, and optimize grinding uniformity, to overcome the problems, such as fast wear, uneven stress and unstable processing quality of prior art.

[0008] The utility model provides a kind of grinding head for reducing stress concentration, the rotating mechanism is arranged in the inside of the shell assembly, multiple abrasive block foot assemblies are arranged around the outside of the shell assembly, and are used to perform grinding operation;

[0009] The rotating mechanism is used to drive the overall rotation of multiple abrasive block foot assemblies, and periodically drive each abrasive block foot assembly to swing independently by eccentric transmission;

[0010] The rotating mechanism includes a rotating shaft, an eccentric shaft sleeve, a stacked gear and an external gear.

[0011] The rotating shaft is installed in the shell assembly, and the eccentric shaft sleeve is sleeved on the rotating shaft to form eccentric rotation.

[0012] The stacked gear is sleeved on the eccentric shaft sleeve and includes a first gear ring and a second gear ring.

[0013] The external gear is fixed inside the shell assembly, the first gear ring is eccentrically engaged with the inner ring of the external gear to form eccentric internal engagement gear transmission, so that the first gear ring revolves around the rotating shaft under the drive of the eccentric shaft sleeve and simultaneously rotates around its own axis.

[0014] Each of the multiple abrasive block foot assemblies includes an abrasive block foot drive gear, the second gear ring is engaged with each abrasive block foot drive gear, and the second gear ring is used to apply periodic tangential force to the abrasive block foot drive gear based on eccentric motion to realize independent swinging of the abrasive block foot assembly.

[0015] In a preferred implementation, further, the first gear ring is provided with multiple oil channels for delivering lubricating oil to the surface of each part using the extrusion force generated by the eccentric engagement of the first gear ring with the external gear.

[0016] In a preferred implementation, further, the rotating mechanism further includes a bearing, a pinion seat connecting disc, a pinion seat and a pinion.

[0017] In the preferred implementation, further, the rotating mechanism further comprises a large gear; the large gear is sleeved on the rotating shaft and connected with the eccentric shaft sleeve; the small gears are uniformly distributed around the large gear and meshed with the large gear.

[0018] In the preferred implementation, further, the grinding block foot assembly comprises a grinding block foot, the upper part of the grinding block foot is in a cylindrical structure and internally mounted with a gear, both ends of the gear are provided with rotating shafts, one end of the rotating shaft of the gear is mounted in a mounting seat in the lower shell, and the other end is mounted in the cylindrical structure of the upper part of the grinding block foot.

[0019] In the preferred implementation, further, the gear is meshed with the second ring gear.

[0020] In the preferred implementation, further, the oil channel is distributed along the outer periphery of the first ring gear.

[0021] In the preferred implementation, further, the shell assembly comprises an upper shell and a lower shell, and the two are sealingly connected through a sealing ring.

[0022] In the preferred implementation, further, the central shaft of the grinding block foot driving gear is perpendicular to the rotating shaft.

[0023] In the preferred implementation, further, the first ring gear is arranged at the upper part of the lamination gear, and the second ring gear is arranged at the bottom of the lamination gear.

[0024] The beneficial effects of the present application are:

[0025] Firstly, the grinding head of the present application realizes the combined motion of overall rotation and independent swinging through the eccentric transmission mechanism, effectively solving the problems of stress concentration, uneven grinding contact and uneven wear caused by the rigid connection of the grinding block foot assembly in the existing grinding equipment. Through the eccentric meshing structure of the lamination gear, each grinding block foot assembly can periodically swing while the grinding block foot assembly rotates as a whole, so that the grinding force is uniformly distributed on the machining surface, reducing local excessive wear and improving machining precision. In addition, the eccentric meshing of the first ring gear and the fixed external gear forms a periodic extrusion force. Compared with the traditional grinding head, the present application can reduce local stress concentration during grinding, prolong the service life of the equipment, and improve the machining quality and efficiency.

[0026] Secondly, in the preferred implementation, the present application sets multiple oil channels on the first ring gear, uses the extrusion force generated by the eccentric meshing between the first ring gear and the external gear to promote the active flow of lubricating oil, and thus realizes the automatic delivery of lubricating oil. This design effectively solves the problem of uneven distribution of lubricating oil, so that the lubricating oil can automatically penetrate into the contact surface during the meshing process of the gears, reducing friction loss, reducing gear wear, and improving the stability and service life of the gear transmission.

[0027] Third, in the preferred implementation, the rotating mechanism of the utility model adopts pinion-gear transmission structure, wherein the pinions are uniformly arranged around the gear and meshed with the gear, ensuring that multiple pinions share the transmission torque at the same time, making the torque distribution more uniform, reducing the situation that a single gear is subjected to excessive force, thereby reducing the local stress concentration of the transmission system and improving the transmission stability and durability; in addition, through the combination of the eccentric shaft sleeve and the gear wheel, the gear wheel forms a composite motion of revolution + rotation in the rotation process, and further through the meshing of the second gear ring and the grinding block foot driving gear, the grinding block foot assembly is driven to swing independently while rotating as a whole. This design optimizes the distribution of grinding force, enables the grinding block foot assembly to dynamically adjust the angle when contacting the workpiece, improves the grinding uniformity, and reduces the problem of local over-grinding or uneven grinding.

[0028] Fourth, in the preferred implementation, the utility model is designed with a cylindrical structure on the upper part of the grinding block foot, and a gear is installed inside, so that both ends of the gear are supported by the rotating shaft, one end is installed in the mounting seat in the lower shell, and the other end is installed in the cylindrical structure on the upper part of the grinding block foot, forming stable rotary support. This arrangement ensures that the central shaft of the grinding block foot driving gear is perpendicular to the gear rotating shaft, so that the grinding block foot assembly can withstand uniform radial force during transmission, effectively reducing lateral swinging and improving structural rigidity and transmission accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a perspective view of the stress-reducing grinding head of the embodiment of the utility model;

[0030] Figure 2 is a top view of the stress-reducing grinding head of the embodiment of the utility model;

[0031] Figure 3 is Figure 2 the sectional view of A-A of

[0032] Figure 4 is a perspective view of the stress-reducing grinding head of the embodiment of the utility model without the shell assembly;

[0033] Figure 5 is a perspective view of the stress-reducing grinding head of the embodiment of the utility model without the shell assembly and the pinion seat connecting disc;

[0034] Figure 6 is a perspective view of the eccentric shaft sleeve, gear wheel and external gear in the assembled state of the embodiment of the utility model;

[0035] Figure 7is the embodiment of the utility model's eccentric shaft sleeve and the three -dimensional structure view of the gear in the assembled state;

[0036] Figure 8 is the three -dimensional structure view of the gear of the embodiment of the utility model.

[0037] Wherein, 1-rotating mechanism;10-rotating shaft;11-bearing;12-small gear seat connecting disc;13-large gear;14-small gear seat;15-small gear;16-eccentric shaft sleeve;17-gear;170-first gear ring;171-second gear ring;172-oil channel;18-external gear;2-housing assembly;20-upper housing;21-lower housing;3-grinding block foot assembly;30-grinding block foot;31-grinding block foot drive gear;32-grinding block foot mounting seat. DETAILED DESCRIPTION

[0038] In order to make those skilled in the art better understand the technical scheme of the present application, the present application will be further described in detail in conjunction with the drawings and embodiments.

[0039] In the description of the present application, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance;The term "multiple" refers to two or more, unless otherwise explicitly limited. The terms "mounting", "connection", "connection", "fixing" and the like should be broadly understood, for example, "connection" can be fixed connection, or detachable connection, or integrally connected;"Connected" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In the description of the present application, it should be understood that the terms "up", "down", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or units referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0041] In the description of the present application, the terms "one embodiment / way", "some embodiments / ways", "specific embodiments / ways" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment / way or example are included in at least one embodiment / way or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment / way or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments / ways or examples in a suitable manner.

[0042] The present application aims to improve its stability, durability, and reduce the problem of loosening, wear and fatigue damage caused by long-term use. The existing grinding head connection method usually adopts convex-avoid hole matching structure, which is easy to cause stress concentration, so that the connection part appears cracks in long-term operation, affecting the service life and machining precision of the equipment. In view of the above problems, the present application provides a grinding head structure based on tooth connection, which replaces the traditional mechanical cooperation by tooth engagement, so that the force is evenly distributed on the tooth surface, effectively reducing the stress concentration phenomenon, thereby prolonging the service life and improving the grinding precision. In addition, the present application also optimizes the design of the lubricating oil channel for high-load, high-speed moving parts such as grinding shaft, sliding block and wheel disc, reduces friction loss, and prevents excessive wear of parts caused by insufficient lubrication, improves the overall stability and reliability of the grinding equipment.

[0043] As shown in the accompanying drawings Figures 1-8 A grinding head for reducing stress concentration includes a housing assembly 2, a rotating mechanism 1 and a grinding block foot assembly 3. The rotating mechanism 1 is installed inside the housing assembly 2, and a plurality of grinding block foot assemblies 3 are arranged around the outside of the housing assembly 2. The grinding block is installed at the bottom of each grinding block foot assembly 3 for performing grinding operation. The rotating mechanism 1 is used to drive the overall rotation of all grinding block foot assemblies 3, and to drive the independent swing of each grinding block foot assembly 3, ensuring efficient and uniform grinding effect.

[0044] The rotating mechanism 1 comprises a rotating shaft 10, an eccentric shaft sleeve 16, a stacked gear 17 and an external gear 18. The rotating shaft 10 serves as a central main shaft, provides rotating support and is fixed by bearings. The eccentric shaft sleeve 16 is sleeved on the rotating shaft 10, the stacked gear 17 is sleeved on the eccentric shaft sleeve 16, the external gear 18 surrounds the periphery of the stacked gear 17 and is fixed inside the shell assembly 2 coaxially with the rotating shaft 10. The stacked gear 17 is composed of a first gear ring 170 and a second gear ring 171 stacked together, which respectively drive the external gear 18 and the abrasive block foot assembly 3. The first gear ring 170 is located at the upper part of the stacked gear 17, and the teeth thereof are uniformly distributed along the outer diameter. The inner ring of the external gear 18 is provided with teeth uniformly distributed along the inner ring circumference, which are engaged with the teeth of the first gear ring 170, forming an internal tooth engagement transmission. The inner ring diameter of the external gear 18 is larger than the outer diameter of the first gear ring 170, and the centers of the two are eccentrically arranged, so the engagement mode is an eccentric internal engagement gear transmission. In this structure, the external gear 18 serves as a fixed gear, and the first gear ring 170 revolves around the main shaft under the drive of the eccentric shaft sleeve 16 and simultaneously rotates around its own axis, thereby forming an eccentric gear mechanism. Due to the eccentric engagement of the first gear ring 170 and the external gear 18, periodic extrusion force is generated in the tooth contact area of the two, which promotes the first gear ring 170 to run along the track of the inner ring of the external gear 18. The second gear ring 171 is located at the bottom of the stacked gear 17, and the teeth thereof are directed downward for driving the abrasive block foot assembly 3. The abrasive block foot assembly 3 comprises an abrasive block foot driving gear 31, and the second gear ring 171 is engaged with the abrasive block foot driving gear 31 to make it move with the stacked gear 17. The central shaft of the abrasive block foot driving gear 31 is perpendicular to the central shaft of the rotating shaft 10, ensuring the stability of the swing drive, so that the abrasive block foot assembly 3 can accurately follow the movement of the stacked gear 17, achieving uniform grinding or polishing effect.

[0045] In addition, in order to optimize the lubrication performance, a plurality of oil channels 172 are provided around the first gear ring 170, and the extrusion force generated by the eccentric engagement of the first gear ring 170 and the external gear 18 will input the internal oil to the bearing through the oil channels 172, achieving lubrication.

[0046] The rotating mechanism 1 further comprises bearings 11, a pinion gear seat connecting disc 12, a gear wheel 13, a pinion gear seat 14 and a pinion gear 15. The shell assembly 2 comprises an upper shell 20 and a lower shell 21. The upper shell 20 and the lower shell 21 are buckled together to form an internal cavity structure, and the connecting surface is provided with a sealing ring to effectively prevent internal lubricating oil from leaking and improve sealing performance. The central holes of the upper shell 20 and the lower shell 21 are provided with through central holes, and the rotating shaft 10 extends into the interior through the central hole of the upper shell 20 and is fixed to the lower shell 21 through a connecting piece, ensuring the stability of the rotating mechanism. In the cavity structure, the upper part of the rotating shaft 10 is provided with two bearings 11, as shown in the attached drawings. Figure 3As shown, the two bearings support the rotating shaft, reduce friction, and improve rotation stability. The pinion seat connecting disc 12 is sleeved on the bearing 11, and a plurality of pinion seat mounting holes are arranged on the inner side of the edge of the pinion seat connecting disc 12 for mounting the pinion seat 14.

[0047] A plurality of pinion seat mounting holes are arranged on the inner side of the edge of the pinion seat connecting disc 12, the bottom of the pinion seat 14 is provided with a flange structure, the flange structure is fixed on the pinion seat connecting disc 12, the top surface of the flange structure is provided with a connecting column, the pinion 15 is mounted on the connecting column and supported by the flange structure. The pinion seat 14 is uniformly distributed around the rotating shaft 10 through the pinion seat connecting disc 12, so as to ensure the stability of transmission. The gear wheel 13 is sleeved on the rotating shaft 10 and forms meshing transmission with the pinion 15. The pinion 15 surrounds the gear wheel 13, and in the implementation mode of the application, three pinions 15 are uniformly distributed to ensure stable transmission, reduce unbalanced load and improve the rotation balance of the system. The eccentric shaft sleeve 16 is located at the bottom of the gear wheel 13, and the eccentric structure determines the subsequent eccentric transmission mode. The cogwheel 17 is sleeved on the eccentric shaft sleeve 16, and under the action of eccentric motion, the cogwheel 17 forms a composite motion mode of overall rotation and local swinging. The external gear 18 is fixed in the lower shell 21 and surrounds the outer periphery of the first tooth ring 170 of the cogwheel 17 to form eccentric internal meshing transmission.

[0048] The grinding block foot assembly 3 further comprises a grinding block foot 30 and a grinding block foot mounting seat 32. The bottom of the grinding block foot 30 is used for mounting a grinding block to realize grinding or polishing function. The upper part of the grinding block foot 30 is in a cylindrical structure, a gear is mounted in the cylindrical structure, and the gear is provided with rotating shafts at both ends, one end of the rotating shaft is mounted in the mounting seat in the lower shell 21, and the other end of the rotating shaft is mounted in the cylindrical structure of the upper part of the grinding block foot 30 and connected through a shaft sleeve to ensure the stability in the rotating motion. The grinding block foot mounting seat 32 is sleeved on the rotating shaft of the gear through a shaft sleeve and fixedly connected with the rotating shaft, so that the grinding block foot assembly 3 can swing smoothly, and the durability and structural stability of the overall assembly are improved.

[0049] The working principle of the grinding head for reducing stress concentration is as follows:

[0050] The rotation of the rotating shaft 10 is supported by the bearing 11 at its upper part, ensuring stable operation and reducing radial friction. The rotating shaft 10 drives the lower housing 21 and the upper housing 20 to rotate, as the housing assembly 2 is fixedly connected as a whole, all the structures connected thereto rotate accordingly. The pinion seat connecting disc 12 is fixedly connected to the upper housing 20 through a connecting member, thus rotating accordingly and further driving the pinion seat 14 mounted thereon to rotate as a whole. Since the outer gear 18 is fixed inside the lower housing 21, the entire outer gear 18 rotates synchronously, without affecting the independent movement of the internal eccentric mechanism. The grinding shoe foot assembly 3 is fixed to the housing assembly 2 through the grinding shoe foot mounting seat 32, thus rotating as a whole with the housing assembly 2, ensuring that all the grinding shoe feet rotate synchronously and form a stable motion trajectory.

[0051] The pinion 15 transmits rotational force to the gear wheel 13 through gear meshing. The gear wheel 13 is directly connected to the eccentric shaft sleeve 16, so when the gear wheel 13 rotates, the eccentric shaft sleeve 16 rotates synchronously. The eccentric shaft sleeve 16 is offset mounted relative to the rotating shaft 10, so that when it rotates, it does not rotate coaxially, but forms an eccentric motion, which further affects the subsequent power transmission.

[0052] When the eccentric shaft sleeve 16 rotates, it drives the gear wheel 17 to rotate, forming a complex motion mode of revolution + rotation. The gear wheel 17 is meshed with the outer gear 18, and since the outer gear 18 is relatively fixed during overall rotation, the outer circle of the gear wheel 17 is smaller than the inner circle of the outer gear 18, and the inside is filled with oil. Therefore, when the gear wheel 17 rotates, it will rotate the oil, forming a periodic extrusion pressure. Since the first tooth ring 170 is directly eccentrically meshed with the outer gear 18, a periodic oil pressure effect is generated during meshing. This extrusion pressure causes the internal lubricating oil to be distributed to each key contact point, including the gear meshing surface, the bearing 11 and the rotating shaft 10, along the oil channel 172, ensuring the lubrication of the entire system, reducing friction loss and improving transmission efficiency.

[0053] The first ring gear 170 is eccentrically engaged with the fixed external gear 18, so that the stacked gear 17 revolves around the rotation shaft 10, while itself rotates around the center shaft. The eccentric engagement feature makes the center of the stacked gear 17 slightly periodically offset in each rotation, which acts on the second ring gear 171. The second ring gear 171 is located below the stacked gear 17, and its teeth are distributed along the outer periphery, engaging with all the abrasive block foot driving gears 31. When the stacked gear 17 moves eccentrically, the second ring gear 171 also generates a non-uniform gear thrust, which affects the engaged abrasive block foot driving gears 31. The abrasive block foot driving gears 31 are connected with the abrasive block foot assembly 3 through the shaft sleeve, and the center shaft is perpendicular to the rotation shaft 10. When the second ring gear 171 generates an eccentric thrust, it exerts a periodic tangential force on the abrasive block foot driving gears 31, causing the abrasive block foot driving gears 31 to swing left and right around their support shaft. Because the engagement force is non-uniform, this force causes the abrasive block foot assembly 3 to swing slightly while rotating. This makes it swing independently on the basis of overall rotation, ensuring that each abrasive block foot assembly 3 can adapt to the grinding surface and achieve more uniform grinding. The periodic change of eccentric swing ensures that the grinding force can act on different areas of the workpiece at different points in time, optimizing the contact state, improving grinding uniformity, and preventing uneven wear caused by fixed direction grinding.

[0054] The above only describes the embodiments of the present application, and the specific structures and properties of the scheme known to the public are not described in detail. It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be realized in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims.

Claims

1. A grinding head for reducing stress concentration, comprising a housing assembly (2), a rotating mechanism (1) and a plurality of grinding block foot assemblies (3), characterized in that: the rotating mechanism (1) is arranged inside the housing assembly (2), and a plurality of grinding block foot assemblies (3) are arranged around the outside of the housing assembly (2) and used to perform a grinding operation; the rotating mechanism (1) is used to drive the overall rotation of the plurality of grinding block foot assemblies (3) and periodically drive each grinding block foot assembly (3) to swing independently through eccentric transmission; the rotating mechanism (1) comprises a rotating shaft (10), an eccentric shaft sleeve (16), a stacked gear (17) and an external gear (18); the rotating shaft (10) is installed in the housing assembly (2), and the eccentric shaft sleeve (16) is sleeved on the rotating shaft (10) to form eccentric rotation; the stacked gear (17) is sleeved on the eccentric shaft sleeve (16) and comprises a first gear ring (170) and a second gear ring (171), and the second gear ring (171) is arranged at the bottom of the first gear ring (170); the external gear (18) is fixed inside the housing assembly (2), the first gear ring (170) is eccentrically engaged with the inner ring of the external gear (18) to form eccentric inner engagement gear transmission, so that the first gear ring (170) revolves around the rotating shaft (10) under the drive of the eccentric shaft sleeve (16) and simultaneously rotates around its own axis; each grinding block foot assembly (3) comprises a grinding block foot drive gear (31), the second gear ring (171) is engaged with each grinding block foot drive gear (31), and the second gear ring (171) is used to exert periodic tangential force on the grinding block foot drive gear (31) based on eccentric motion to realize independent swinging of the grinding block foot assembly (3). The first gear ring (170) is provided with a plurality of oil channels (172) for delivering lubricating oil to the surfaces of various parts by using the extrusion force generated by the eccentric engagement of the first gear ring (170) and the external gear (18). The rotating mechanism (1) further comprises a bearing (11), a pinion gear seat connecting disc (12), a pinion gear seat (14) and a pinion gear (15); the bearing (11) is sleeved on the rotating shaft (10), the pinion gear seat connecting disc (12) is sleeved on the bearing (11), and a plurality of pinion gear seats (14) for installing pinion gears (15) are distributed on the pinion gear seat connecting disc (12). The rotating mechanism (1) further comprises a large gear (13); the large gear (13) is sleeved on the rotating shaft (10) and connected with the eccentric shaft sleeve (16); the pinion gears (15) are uniformly distributed around the large gear (13) and engaged with the large gear (13) for transmission. The grinding block foot assembly (3) comprises a grinding block foot (30), the upper part of the grinding block foot (30) is in a cylindrical structure and internally installed with a gear, both ends of the gear are provided with rotating shafts, one end of the rotating shaft of the gear is installed in a mounting seat in the lower housing (21), and the other end is installed in the cylindrical structure of the upper part of the grinding block foot (30). The gear is engaged with the second gear ring (171). ​ ​ 2. The stress concentration reducing grinding head according to claim 1, wherein ​ 3. The stress concentration reducing grinding head according to claim 1, wherein ​ 4. The stress concentration reducing grinding head according to claim 3, wherein ​ 5. The stress concentration reducing grinding head according to claim 3, wherein ​ 6. The stress concentration reducing grinding head according to claim 5, wherein ​ 7. The stress concentration reducing grinding head according to claim 2, wherein The oil passage (172) is distributed along the outer periphery of the first ring gear (170).

8. The stress concentration reducing grinding head according to claim 1, wherein The shell assembly (2) comprises an upper shell (20) and a lower shell (21) which are sealingly connected by a sealing ring.

9. The stress concentration reducing grinding head according to claim 1, wherein The central shaft of the grinding block foot driving gear (31) is perpendicular to the rotating shaft (10).

10. The stress concentration reducing grinding head according to claim 1, wherein The first ring gear (170) is arranged at the upper portion of the laminated gear (17), and the second ring gear (171) is arranged at the bottom portion of the laminated gear (17).

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