CN111745539A - An adjustable grinder device for processing inner holes of three-roll star-shaped precision rolling mill stands - Google Patents

Abstract

The invention relates to the technical field of three-roll mills for bar processing, and discloses an adjustable grinder device for processing the inner holes of a three-roll star-shaped precision rolling mill frame. The part rotates under the drive of the drive motor; the drive shaft is sleeved with an inner eccentric sleeve that rotates relative to it, and the inner eccentric sleeve is connected to the radial feed adjustment assembly and controlled to rotate by the radial feed adjustment assembly; the inner eccentric sleeve is sleeved An outer eccentric sleeve is provided, and the outer eccentric sleeve is connected with the revolution adjusting assembly and controlled to rotate by the revolution adjusting assembly. In the present invention, the self-rotating shaft member drives the grinding wheel to rotate for grinding, and the outer eccentric sleeve is arranged to drive the self-rotating shaft member to perform revolving motion, thereby improving the grinding effect; The precision of the grinding is controlled, and the hole pattern of more sizes can be ground.

Description

An adjustable grinder device for processing inner holes of three-roll star-shaped precision rolling mill stands

technical field

The invention relates to the technical field of three-roll mills for bar processing, in particular to an adjustable grinder device for processing the inner holes of a three-roll star-shaped precision rolling mill stand.

Background technique

At present, the three groups of 120° angle holes of the three-roll star-shaped precision rolling mill stand are mainly processed by CNC boring machines. Because the depth of each group of inner holes of the rack is relatively long, the spindle of the small boring machine is relatively thin, and the tool bar extends into the inner hole when working. It is easy to vibrate and reduce the processing effect; if a large boring machine is used for processing, the size of the frame product is relatively small, and it is a waste of resources to start the large boring machine. to the desired dimensional accuracy.

In view of the above situation, in the prior art, a grinding machine or a grinding machine device is provided to reprocess the frame after semi-finishing, so as to achieve a processing technology of a more ideal size, which can improve the processing effect of the product. However, the adjustment of the grinding precision of the grinding machine or the grinding machine device itself has not reached the level of freedom and precise control, resulting in a small application range of the grinding machine or the grinding machine device, and the size that it can adapt to grinding is also limited.

Therefore, the structure of the grinder or grinder device in the prior art still needs to be optimized and improved, and a more reasonable technical solution needs to be researched and proposed to make the grinder or grinder device more applicable and compatible. The control of the range is more precise to solve the problems existing in the prior art.

SUMMARY OF THE INVENTION

In order to overcome the defects of the prior art mentioned in the above content, the present invention provides an adjustable grinder device for processing the inner hole of a three-roll star-shaped precision rolling mill stand, which is driven by the main drive shaft of the grinder device The grinding wheel is used for grinding, and at the same time, the main drive shaft is driven to make a revolution-like movement through the revolution adjustment component, and the grinding wheel is controlled to grind the hole wall that meets the standard; The size of the hole wall greatly improves the controllability and processing accuracy of the mill device.

In order to achieve the above object, the technical scheme specifically adopted in the present invention is:

An adjustable grinder device for processing the inner hole of a three-roll star-shaped precision rolling mill frame, comprising a self-rotating shaft piece for installing a grinding wheel, and the self-rotating shaft piece rotates under the drive of a drive motor; the drive shaft piece is covered with a sleeve There is an inner eccentric sleeve that rotates relative to it, the inner eccentric sleeve is connected to the radial feed adjustment component and controlled to rotate by the radial feed adjustment component; the outer eccentric sleeve is provided on the outer eccentric sleeve, and the outer eccentric sleeve is connected to the revolution adjustment component and is The revolution adjusting assembly controls the rotation.

In the grinding machine disclosed above, the self-rotating shaft member is provided with a grinding wheel for directly contacting the surface to be ground. When the self-rotating shaft member rotates, the outer eccentric sleeve rotates under the control of the revolution adjusting assembly, and the self-rotating shaft member is relatively opposite to the outer eccentric shaft. The parts are eccentrically arranged, so the self-rotating shaft parts can revolve at the same time as the self-rotation, and the grinding surface can be processed in this way to obtain a hole surface with precise dimensions. The inner eccentric sleeve rotates under the control of the feed adjustment component, and the rotation shaft is directly eccentrically arranged in the inner eccentric sleeve. The rotation of the inner eccentric sleeve adjusts the revolution radius of the rotation shaft, so that the mill can be applied to more The processing object can be ground and processed for more sizes of hole patterns.

Further, the feed adjustment assembly can adopt various structures to realize adjustment, and one of the feasible solutions is listed here. A first planetary gear structure is arranged at the hole and the concentric through hole. The first sun gear of the first planetary gear structure is provided with internal teeth and meshes with the internal gear eccentrically arranged with the first sun gear. The inner eccentric sleeve is connected to the inner gear. The gear rotates synchronously with the internal gear. As one of the various options, using the worm gear assembly to cooperate with the planetary gear structure can facilitate the use of a more convenient input method to drive the feed adjustment assembly.

Further, the feed adjustment assembly is not often turned on for operation, and it is operated when the feed amount of the grinding wheel needs to be adjusted. Here, the structure of the feed adjustment assembly is optimized, and the following feasible solutions are listed: The feed adjustment assembly also includes a feed drive assembly connected to the worm.

Further, the structure of the feed adjustment assembly is not uniquely determined, and a variety of feasible solutions can be adopted. The feed handle is fastened to the feed worm through the handle gland, and the feed handle is provided with a rocker for driving the feed worm to rotate. When using this structure to adjust the feed amount, the rocker can be shaken to drive the handle to rotate, thereby driving the worm to rotate to realize the adjustment of the feed amount.

Further, in order to make the revolution adjustment of the outer eccentric sleeve and the feed adjustment of the inner eccentric sleeve not interfere with each other, the structure at the outer eccentric sleeve is optimized. Specifically, the following feasible solutions are listed: Connect the second planetary gear structure, the second sun gear of the second planetary gear structure is sleeved on the outer eccentric sleeve, the second planetary gear structure and the planetary carrier of the first planetary gear structure are connected and fixed or share a planetary carrier, when a planetary carrier is shared When the carrier is installed, there are two mounting surfaces on the planet carrier for mounting the planetary gears.

Further, the optimization and improvement of the first planetary gear structure and the second planetary gear structure are continued, and the following feasible solutions are specifically proposed: the first ring gear of the first planetary gear structure and the second ring gear of the second planetary gear structure are described. There are circumferential overlapping sections therebetween, and the circumferential overlapping sections are provided with sliding contact parts or rolling contact parts.

The significance of this setting is that the feed adjustment and revolution adjustment do not interfere with each other.

When performing revolution adjustment, the outer eccentric sleeve is driven to rotate by the revolution adjustment assembly, the outer eccentric sleeve drives the second sun gear in the second planetary gear structure to rotate, and the planetary gear in the second planetary gear rotates accordingly; The inner teeth of the worm gear are fixedly arranged on the feed worm gear, and the feed adjustment assembly will not rotate without driving force, but the planet carriers of the first planetary gear structure and the second planetary gear structure are connected and fixed or the two share the planet carrier. The planetary gear of the planetary gear structure will revolve following the planetary gear of the second planetary gear structure, and the sun gear of the first planetary gear will not rotate during this process, which will not affect the feed adjustment amount.

When the feed adjustment is performed, the first ring gear of the first planetary gear structure rotates with the feed worm gear through the feed drive adjustment assembly, which drives the planetary gear and the first sun gear to rotate, and the inner gear rotates and drives the inner eccentric sleeve to rotate. In this process, the revolution adjustment assembly does not provide driving force, and the second ring gear in the second planetary gear structure is fixedly arranged. Due to the connection of the planetary carrier or the shared planetary carrier, the first planetary gear structure and the second The planetary gear of the planetary gear structure will not revolve, and the outer eccentric sleeve will not rotate during this process.

Further, the structure of the revolution adjustment assembly is optimized, and the following specific solutions are listed here: the revolution adjustment assembly includes a revolution worm gear and a revolution worm, the revolution worm gear is connected to the outer eccentric sleeve and drives the outer eccentric sleeve to rotate synchronously, and the revolution worm It rotates under the drive of the revolution motor. A deceleration mechanism can be set between the revolving motor and the revolving worm, and a deceleration mechanism with an appropriate speed ratio can be selected according to the required output speed.

Further, when installing the revolving worm gear, the revolving worm gear and the outer eccentric sleeve are coaxially arranged. Here, the installation structure of the revolving worm gear is optimized, and the following specific feasible solutions are listed: the outer eccentric shaft is fixed on the sleeve with a A cushion cover, the revolving worm gear is connected and fixed to the cushion cover. After this setting, the revolving worm gear and the outer eccentric sleeve can rotate synchronously to prevent slippage.

Further, the function of the self-rotating shaft member is to drive the grinding wheel to rotate, and its structure is not uniquely determined. Here, an optimization is carried out and a specific feasible solution is presented: the self-rotating shaft member includes a coaxially connected main drive shaft and An input shaft, the main transmission shaft is connected with the drive motor in a transmission, and the end of the input shaft is provided with a chuck for clamping the grinding wheel. As one of many possible options, the length and diameter of the input shaft can be selected and set according to the specific working environment, and it is also convenient for disassembly, maintenance and replacement, which can increase the convenience in the operation of the mill device.

Further, the structure of the input shaft and the main drive shaft is further refined, the input shaft extends out of the inner eccentric sleeve and the outer rotating sleeve of the input shaft is provided with a grinding rod support sleeve, which is connected to the inner eccentric sleeve and is connected to the inner eccentric sleeve. coaxial rotation. The grinding rod support sleeve rotates synchronously with the inner eccentric sleeve to protect the grinding rod support sleeve.

Further, in order to protect each component and place external impurities to affect the operation of the component, the entire mill device also includes a chassis, and the described self-rotating shaft, inner eccentric sleeve, outer eccentric sleeve, feed adjustment component and revolution adjustment component are all uniform. The utility model is arranged in the casing, and a plurality of bearing parts matched with the outer eccentric sleeve are arranged in the casing. When set in this way, the chassis plays a role of supporting and protecting the internal components.

Compared with the prior art, the present invention has the following beneficial effects:

In the invention, the self-rotating shaft member drives the grinding wheel to rotate for grinding, and the outer eccentric sleeve is arranged to drive the self-rotating shaft member to perform revolving motion, thereby improving the grinding effect; The precision of the grinding is controlled, and the hole pattern of more sizes can be ground.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be It is regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is the overall structure schematic diagram of the mill device;

Fig. 2 is the partial structure enlarged schematic diagram at A place in Fig. 1;

Fig. 3 is the longitudinal sectional structure schematic diagram of the mill device;

Fig. 4 is the partial structure enlarged schematic diagram at B in Fig. 3;

Fig. 5 is the partial structure enlarged schematic diagram at C place in Fig. 3;

Fig. 6 is the partial structure enlarged schematic diagram at D in Fig. 3;

Fig. 7 is the sectional structure schematic diagram of B-B surface in Fig. 3;

Fig. 8 is the sectional structure schematic diagram of C-C plane in Fig. 3;

Fig. 9 is the sectional structure schematic diagram of D-D plane in Fig. 3;

FIG. 10 is a schematic cross-sectional structural diagram of the cooperation between the mill device and the rolling mill housing.

The corresponding meanings of the symbols in the accompanying drawings are: 1, chassis; 7, feed handle; 8, rocker; 9, handle gland; 10, feed worm; 11, feed worm gear; 12, first ring gear ; 13, planetary gear; 14, main drive shaft; 15, pulley; 16, inner eccentric sleeve; 17, tapered roller bearing; 18, outer eccentric sleeve; 19, revolution worm gear; 20, cushion sleeve; 21, deep groove Ball bearing; 23, grinding rod support sleeve; 24, input shaft; 25, chuck; 26, grinding wheel; 27, revolving worm; 28, second sun gear; 29, internal gear; 30, first sun gear; 31 , planet carrier; 32, needle roller; 33, second ring gear; 34, frame.

Detailed ways

The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

It should be noted here that the descriptions of these embodiments are used to help the understanding of the present invention, but do not constitute a limitation of the present invention. Specific structural and functional details disclosed herein are merely illustrative of example embodiments of the present invention. However, the present invention may be embodied in many alternative forms and should not be construed as limited to the embodiments set forth herein.

Example

This embodiment adjusts and explains the grinding device of the three-high star mill. The inner hole of the three-high mill is used to set the roller shaft of the roller. The precise installation of the roller shaft can ensure that the roller shaft is in the rolling process. stable and reliable. As shown in Figure 10, the grinding device in this embodiment achieves the accuracy of the inner hole by grinding the inner hole. The device is adjusted and ground.

Specifically, as shown in FIG. 1 , FIG. 2 and FIG. 3 , an adjustable grinder device for processing the inner hole of a three-roll star-shaped precision rolling mill stand 34 disclosed in this embodiment includes a grinding wheel 26 for installing a grinding wheel 26 . The rotation shaft is driven by the drive motor; the inner eccentric sleeve 16 is sleeved on the transmission shaft to rotate relative to it, and the inner eccentric sleeve 16 is connected to the radial feed adjustment component and is fed by the radial feed. The adjustment assembly controls the rotation; the inner eccentric sleeve 16 is provided with an outer eccentric sleeve 18, and the outer eccentric sleeve 18 is connected to the revolution adjustment assembly and controlled to rotate by the revolution adjustment assembly.

In the grinding machine disclosed above, the self-rotating shaft is provided with a grinding wheel 26 for directly contacting the surface to be ground. When the self-rotating shaft rotates, the outer eccentric sleeve 18 is rotated under the control of the revolution adjusting assembly, while the self-rotating shaft is relatively outer. The eccentric shaft is eccentrically arranged, so the self-rotating shaft can revolve while rotating, and the grinding surface can be processed in such a way to obtain a hole surface with precise dimensions. The inner eccentric sleeve 16 realizes rotation under the control of the feed adjustment component, and the rotation shaft is directly eccentrically arranged in the inner eccentric sleeve 16, and the rotation of the inner eccentric sleeve 16 adjusts the revolution radius of the rotation shaft, so that the mill can be applied For more processing objects, more hole patterns of more sizes can be ground.

The feed adjustment assembly can be adjusted in a variety of structures. Here is one of the feasible solutions. The specific solution is as follows: As shown in Figures 4 and 7, the feed adjustment assembly includes a feeding worm 10 and a feeding worm wheel 11. The feed worm gear 11 is provided with a concentric through hole and a first planetary gear structure is arranged at the concentric through hole, and the first sun gear 30 of the first planetary gear structure is provided with internal teeth and meshingly connected with the first sun gear 30 eccentrically arranged Internal gear 29, the internal eccentric sleeve 16 is connected to the internal gear 29 and rotates synchronously with the internal gear 29. As one of the various options, using the worm gear assembly to cooperate with the planetary gear structure can facilitate the use of a more convenient input method to drive the feed adjustment assembly.

Preferably, the first sun gear 30 and the inner eccentric sleeve 16 are connected by a key, and the first sun gear 30 and the inner eccentric sleeve 16 are coaxially arranged and rotated coaxially.

The feed adjustment assembly is not often turned on for operation, and is operated when the feed amount of the grinding wheel 26 needs to be adjusted. Here, the structure of the feed adjustment assembly is optimized, and the following feasible solutions are given: The feed adjustment assembly also includes a feed drive assembly connected to the worm.

The structure of the feed adjustment assembly is not uniquely determined, and a variety of feasible solutions can be adopted. As a feasible choice, a specific solution is presented here: as shown in FIG. The feed handle 7 on the worm 10 is fastened to the feed worm 10 through the handle press cover 9 , and a rocker 8 for driving the feed worm 10 to rotate is provided on the feed handle 7 . When using this structure to adjust the feed amount, the rocker 8 can be shaken to drive the handle to rotate, so as to drive the worm to rotate to realize the adjustment of the feed amount.

Preferably, the feeding handle 7 is a circular rotary handle structure, and the rocker 8 is eccentrically arranged on the handle, which can drive the handle to rotate.

In order to make the revolution adjustment of the outer eccentric sleeve 18 and the feed adjustment of the inner eccentric sleeve 16 not interfere with each other, the structure of the outer eccentric sleeve 18 is optimized and set. Specifically, the following feasible solutions are listed: As shown in FIG. 9 , the outer eccentric sleeve 18 is connected to the second planetary gear structure, the second sun gear 28 of the second planetary gear structure is sleeved on the outer eccentric sleeve 18 , and the second planetary gear structure is connected to the first planetary gear structure. The planetary carriers 31 are connected and fixed or share one planetary carrier 31 . When one planetary carrier 31 is shared, the planetary carrier 31 is provided with two mounting surfaces for mounting planetary gears.

Continue to optimize and improve the first planetary gear structure and the second planetary gear structure, and specifically propose the following feasible solution: the first ring gear 12 of the first planetary gear structure and the second ring gear 33 of the second planetary gear structure There is a circumferential overlapping section between them, and a sliding contact part or a rolling contact part is arranged in the circumferential overlapping section.

The significance of this setting is that the feed adjustment and revolution adjustment do not interfere with each other.

Preferably, as shown in FIG. 4 , in this embodiment, the first ring gear 12 and the second ring gear 33 have a 360° circumferential overlap, and a plurality of needle rollers 32 are arranged in the circumferential overlap section.

When performing revolution adjustment, the outer eccentric sleeve 18 is driven to rotate by the revolution adjustment assembly, the outer eccentric sleeve 18 drives the second sun gear 28 in the second planetary gear structure to rotate, and the planetary gear 13 in the second planetary gear rotates accordingly; The internal teeth in the adjustment assembly are fixedly arranged on the feed worm gear 11, and the feed adjustment assembly will not rotate without a driving force, but the planet carriers 31 of the first planetary gear structure and the second planetary gear structure are connected and fixed or both The planetary carrier 31 is shared, and the planetary gear 13 of the first planetary gear structure will follow the planetary gear 13 of the second planetary gear structure to revolve. During this process, the sun gear of the first planetary gear does not rotate and does not affect the feed adjustment amount.

When the feed adjustment is performed, the first ring gear 12 of the first planetary gear structure rotates with the feed worm gear 11 through the feed drive adjustment assembly, which drives the planetary gear and the first sun gear 30 to rotate, and the inner gear 29 rotates and drives the inner gear. The rotation of the eccentric sleeve 16 realizes the feed adjustment; during this process, the revolution adjustment assembly does not provide a driving force, and at the same time, the second ring gear 33 in the second planetary gear structure is fixedly arranged. The planetary gears 13 of the first planetary gear structure and the second planetary gear structure will not revolve, and the outer eccentric sleeve 18 will not rotate during this process.

In this embodiment, the structure of the revolution adjusting assembly is optimized, and the following specific solutions are presented here: As shown in FIG. And drive the outer eccentric sleeve 18 to rotate synchronously, and the revolving worm 27 rotates under the drive of the revolving motor. A deceleration mechanism can be arranged between the revolving motor and the revolving worm 27, and a deceleration mechanism with an appropriate rotational speed ratio can be selected according to the required output rotational speed.

When installing the revolving worm gear 19, the revolving worm gear 19 and the outer eccentric sleeve 18 are coaxially arranged. Here, the installation structure of the revolving worm gear 19 is optimized, and the following concrete and feasible solutions are given: the outer eccentric shaft is fixedly sleeved. There is a cushion cover 20 , and the revolving worm gear 19 is connected and fixed to the cushion cover 20 . After this arrangement, the revolving worm gear 19 and the outer eccentric sleeve 18 can rotate synchronously to prevent slippage.

The function of the self-rotating shaft is to drive the grinding wheel 26 to rotate, and its structure is not uniquely determined. This embodiment is optimized and a specific feasible solution is presented: as shown in Figures 5 and 6, the self-rotating shaft includes: The main transmission shaft 14 and the input shaft 24 are coaxially connected, the main transmission shaft 14 is connected with the drive motor in a transmission, and the end of the input shaft 24 is provided with a chuck 25 for clamping the grinding wheel 26 . As one of many possible options, the provided input shaft 24 can be set according to the specific working environment, and its length, shaft diameter, etc. can be selected and set, and it is also convenient for disassembly, maintenance and replacement, which can increase the convenience in the operation of the mill device.

Preferably, the chuck 25 adopts a combination of a chuck 25A and a chuck 25B arranged opposite to each other to clamp the grinding wheel 26 .

The structure of the input shaft 24 and the main transmission shaft 14 is further refined. The input shaft 24 protrudes from the inner eccentric sleeve 16 and the outer rotating sleeve of the input shaft 24 is provided with a grinding rod support sleeve 23. The grinding rod support sleeve 23 is connected with the inner eccentric sleeve 16. The eccentric sleeve 16 is connected and rotated coaxially. The grinding rod support sleeve 23 rotates synchronously with the inner eccentric sleeve 16 to protect the grinding rod support sleeve 23 . In this embodiment, the grinding rod support sleeve 23 is tightly connected with the end of the inner eccentric shaft through bolts.

In order to protect each component and place external impurities to affect the operation of the component, the entire mill device also includes a chassis 1, and the described self-rotating shaft, inner eccentric sleeve 16, outer eccentric sleeve 18, feed adjustment component and revolution adjustment component are all It is arranged in the casing 1 , and a plurality of bearing parts matched with the outer eccentric sleeve 18 are arranged in the casing 1 . When set in this way, the chassis 1 plays a role of supporting and protecting the internal components.

Preferably, two bearing holes are arranged in the casing 1, one bearing hole is close to the revolution adjusting assembly, and two deep groove ball bearings 21 are arranged in the bearing hole and are used to connect the outer eccentric sleeve 18, and the two deep groove ball bearings 21 are arranged between two deep groove ball bearings 21. A bearing spacer is arranged between them; one bearing hole is close to the second planetary gear, and a tapered roller bearing 17 is arranged in the bearing hole, and the tapered roller bearing 17 is used to sleeve and fix the outer eccentric sleeve 18 .

In this embodiment, a bearing is provided between the main drive shaft 14 and the inner eccentric sleeve 16 , the inner ring of the bearing is sleeved on the main drive shaft 14 , and the outer ring of the bearing abuts against the inner eccentric sleeve 16 . The end of the main transmission shaft 14 extends out of the casing 1 and is provided with a pulley 15. The main transmission shaft 14 is connected to the drive motor through a transmission belt for transmission. On the wall of the case 1, there is a sealing structure for blocking impurities, specifically a labyrinth sealing structure can be used.

The above are the listed embodiments of the present invention, but the present invention is not limited to the above-mentioned optional embodiments. Those skilled in the art can arbitrarily combine the above-mentioned methods to obtain other various embodiments. Various other forms of implementation can be derived. The above-mentioned specific embodiments should not be construed as limiting the protection scope of the present invention, and the protection scope of the present invention should be defined in the claims, and the description can be used to interpret the claims.

Claims (10)

1. an adjustable grinder device for processing the inner hole of a three-roll star-shaped precision rolling mill frame, it is characterized in that: comprise the self-rotating shaft piece for installing the grinding wheel (26), and the self-rotating shaft piece is in the transmission of the drive motor Driven to rotate; the inner eccentric sleeve (16) that rotates relative to the transmission shaft is sleeved, and the inner eccentric sleeve (16) is connected to the radial feed adjustment assembly and controlled to rotate by the radial feed adjustment assembly; the inner eccentric sleeve (16) 16) The outer sleeve is provided with an outer eccentric sleeve (18), and the outer eccentric sleeve (18) is connected to the revolution adjusting assembly and controlled to rotate by the revolution adjusting assembly. 2. The adjustable grinder device for processing the inner hole of a three-roll star-shaped precision rolling mill stand according to claim 1, wherein the feed adjustment assembly comprises a feed worm (10) and a feed worm wheel (11) ), the feeding worm gear (11) is provided with a concentric through hole and a first planetary gear structure is arranged at the concentric through hole, and the first sun gear (30) of the first planetary gear structure is provided with internal teeth and meshingly connected with the first sun gear The inner gear (29) of the wheel (30) is eccentrically arranged, and the inner eccentric sleeve (16) is connected to the inner gear (29) and rotates synchronously with the inner gear (29). 3. The adjustable grinder device for processing the inner hole of a three-roll star-shaped precision rolling mill stand according to claim 2, characterized in that: the feed adjustment assembly further comprises a feed drive assembly connected to the worm. . 4. The adjustable grinder device for processing the inner hole of a three-roll star-shaped precision rolling mill stand according to claim 2 or 3, characterized in that: the outer eccentric sleeve (18) is connected to the second planetary gear structure , the second sun gear (28) of the second planetary gear structure is sleeved on the outer eccentric sleeve (18), the second planetary gear structure and the planetary carrier (31) of the first planetary gear structure are connected fixedly or share a planetary carrier (31) ), when a planet carrier (31) is shared, the planet carrier (31) is provided with two mounting surfaces for mounting planetary gears. 5. The adjustable grinder device for processing the inner hole of a three-roll star-shaped precision rolling mill stand according to claim 4, characterized in that: the first ring gear (12) of the first planetary gear structure and the A circumferential overlapping section exists between the second ring gears (33) of the second planetary gear structure, and a sliding contact member or a rolling contact member is arranged in the circumferential overlapping section. 6. The adjustable grinder device for processing the inner hole of a three-roll star-shaped precision rolling mill stand according to claim 1, wherein the revolving adjustment assembly comprises a revolving worm wheel (19) and a revolving worm (27). ), the revolving worm gear (19) is connected to the outer eccentric sleeve (18) and drives the outer eccentric sleeve (18) to rotate synchronously, and the revolving worm (27) rotates under the drive of the revolving motor. 7. The adjustable grinder device for processing the inner hole of a three-roll star-shaped precision rolling mill stand according to claim 6, wherein the outer eccentric shaft is fixedly sleeved with a cushion sleeve (20), The revolving worm gear (19) is connected and fixed to the cushion cover (20). 8. The adjustable grinder device for processing the inner hole of a three-roll star-shaped precision rolling mill stand according to claim 1, wherein the self-rotating shaft member comprises a coaxially connected main drive shaft (14) and an input shaft (24), the main transmission shaft (14) is drivingly connected with the drive motor, and the end of the input shaft (24) is provided with a chuck (25) for clamping the grinding wheel (26). 9. The adjustable grinder device for processing the inner hole of a three-roll star-shaped precision rolling mill stand according to claim 8, characterized in that: the input shaft (24) protrudes from the inner eccentric sleeve (16) and The outer rotating sleeve of the input shaft (24) is provided with a grinding rod support sleeve (23), and the grinding rod support sleeve (23) is connected with the inner eccentric sleeve (16) and rotates coaxially. 10. The adjustable grinder device for processing the inner hole of a three-roll star-shaped precision rolling mill stand according to claim 1, characterized in that it further comprises a casing (1), and a plurality of external The bearing part matched with the eccentric sleeve (18).

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