CN111745539B - An adjustable grinding device for machining the inner hole of the three-roller star-shaped precision rolling mill frame - Google Patents

Abstract

The invention relates to the technical field of three-roller rolling mill for bar processing, and discloses an adjustable mill device for processing an inner hole of a three-roller star-shaped precise rolling mill frame, which comprises a rotation shaft piece for mounting a grinding wheel, wherein the rotation shaft piece rotates under the transmission drive of a driving motor; an inner eccentric sleeve which rotates relative to the transmission shaft member is sleeved on the transmission shaft member, and the inner eccentric sleeve is connected with the radial feeding adjusting assembly and is controlled to rotate by the radial feeding adjusting assembly; the inner eccentric sleeve is sleeved with an outer eccentric sleeve, and the outer eccentric sleeve is connected with the revolution adjusting assembly and is controlled to rotate by the revolution adjusting assembly. According to the invention, the grinding wheel is driven to rotate by the rotating shaft piece for grinding, and the outer eccentric sleeve is arranged to drive the rotating shaft piece to perform revolution motion, so that the grinding effect is improved; the inner eccentric sleeve is arranged to adjust the radial feeding amount of the rotating shaft part, so that the polishing precision is better controlled, and holes with more sizes can be polished.

Description

An adjustable grinding device for machining the inner hole of the three-roller star-shaped precision rolling mill frame

Technical Field

The present invention relates to the technical field of three-roller rolling mills for processing bar materials, and in particular to an adjustable grinding machine device for processing the inner hole of a three-roller star-shaped precision rolling mill frame.

Background Art

At present, the three groups of 120° angle holes on the three-roller star-shaped precision rolling mill frame are mainly processed by CNC boring machines. Since the depth of each group of inner holes in the frame is relatively long and the spindle of a small boring machine is relatively thin, the tool bar is prone to vibrate when it is inserted into the inner hole, which reduces the processing effect. If a large boring machine is used for processing, the frame product size is relatively small, and starting a large boring machine is a waste of resources. At the same time, the taper, roundness, and surface roughness tolerances of the fine-processing holes of the large boring machine are relatively large, and the ideal dimensional accuracy cannot be achieved.

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

Therefore, the structure of the grinder or grinding device in the prior art needs to be optimized and improved, and a more reasonable technical solution needs to be studied and proposed to make the grinder or grinding device more compatible and more accurately control the grinding range during actual application, so as to solve the problems existing in the prior art.

Summary of the invention

In order to overcome the defects of the prior art mentioned above, the present invention provides an adjustable grinding device for processing the inner hole of a three-roller star-shaped precision rolling mill frame, wherein the grinding wheel is driven by the main transmission shaft of the grinding device for grinding, and the main transmission shaft is driven by the revolution adjustment component to perform quasi-revolutionary motion, thereby controlling the grinding wheel to grind out a regular and standard hole wall; and the quasi-revolutionary radius of the main transmission shaft is adjusted by the feed adjustment component to adjust the size of the hole wall that can be grinded by the grinding wheel, thereby greatly improving the controllability and processing accuracy of the grinding device.

In order to achieve the above object, the technical solution specifically adopted by the present invention is:

An adjustable grinding device for processing the inner hole of a three-roller star-shaped precision rolling mill frame comprises a self-rotating shaft for mounting a grinding wheel, the self-rotating shaft rotates under the drive of a driving motor; an inner eccentric sleeve is sleeved on the driving shaft and rotates relatively therewith, the inner eccentric sleeve is connected to a radial feed adjustment component and is controlled to rotate by the radial feed adjustment component; an outer eccentric sleeve is sleeved on the inner eccentric sleeve, the outer eccentric sleeve is connected to a revolution adjustment component and is controlled to rotate by the revolution adjustment component.

In the above disclosed grinding machine device, the self-rotating shaft is provided with a grinding wheel for directly contacting the surface to be polished. When the self-rotating shaft rotates, the outer eccentric sleeve rotates under the control of the revolution adjustment component, and the self-rotating shaft is eccentrically arranged relative to the outer eccentric shaft, so the self-rotating shaft can realize revolution while rotating, and the grinding surface can be processed in such a path to obtain a hole surface with precise size. The inner eccentric sleeve realizes rotation under the control of the feed adjustment component, and the self-rotating shaft is directly eccentrically arranged in the inner eccentric sleeve, and the rotation of the inner eccentric sleeve adjusts the revolution radius of the self-rotating shaft, so that the grinding machine can be applied to more processing objects and can grind holes of more sizes.

Further, the feed adjustment component can be adjusted by using a variety of structures. Here, one feasible solution is given. The specific solution is as follows: the feed adjustment component includes a feed worm and a feed worm wheel. The feed worm wheel is provided with a concentric through hole and a first planetary gear structure is provided at 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 internal eccentric sleeve is connected to the internal gear and rotates synchronously with the internal gear. As one of the multiple options, the use of a worm gear assembly in conjunction with a planetary gear structure can facilitate the use of a more convenient input method to drive the feed adjustment component.

Furthermore, the feed adjustment component is not always turned on and operated, and is only operated when the feed amount of the grinding wheel needs to be adjusted. The structure of the feed adjustment component is optimized here, and the following feasible solutions are given: the feed adjustment component also includes a feed drive component connected to the worm.

Furthermore, the structure of the feed adjustment assembly is not uniquely determined, and a variety of feasible solutions can be adopted. As a feasible option, a specific solution is cited here: the feed drive assembly includes a feed handle provided on the feed worm, the feed handle is fastened to the feed worm through a handle gland, and the feed handle is provided with a rocker for driving the feed worm to rotate. When the feed amount is adjusted using this structure, the rocker can be shaken to drive the handle to rotate, thereby driving the worm to rotate, thereby achieving the adjustment of the feed amount.

Furthermore, in order to prevent the revolution adjustment of the outer eccentric sleeve and the feed adjustment of the inner eccentric sleeve from interfering with each other, the structure of the outer eccentric sleeve is optimized. Specifically, the following feasible scheme is given: the outer eccentric sleeve is connected to the second planetary gear structure, the second sun gear sleeve of the second planetary gear structure is arranged on the outer eccentric sleeve, the second planetary gear structure is connected and fixed to the planetary carrier of the first planetary gear structure or shares a planetary carrier. When sharing a planetary carrier, the planetary carrier is provided with two mounting surfaces for mounting the planetary gears.

Furthermore, the first planetary gear structure and the second planetary gear structure are further optimized and improved, and the following feasible solution is specifically proposed: there is a circumferential overlapping section between the first ring gear of the first planetary gear structure and the second ring gear of the second planetary gear structure, and a sliding contact component or a rolling contact component is arranged in the circumferential overlapping section.

The significance of this setting is that 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 component, and 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; since the inner teeth in the feed adjustment component are fixedly arranged on the feed worm gear, the feed adjustment component will not rotate without driving force, but the planetary carriers of the first planetary gear structure and the second planetary gear structure are connected and fixed or they share a planetary carrier, and the planetary gear of the first planetary gear structure will follow the planetary gear of the second planetary gear structure to perform revolution motion, and during this process, the sun gear of the first planetary gear does not rotate, and the feed adjustment amount is not affected.

When 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 component, driving the planetary gears and the first sun gear to rotate, and the internal gear rotates and drives the inner eccentric sleeve to rotate to realize feed adjustment; during this process, the revolution adjustment component 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 common planetary carrier, the planetary gears of the first planetary gear structure and the second planetary gear structure will not perform orbital motion, and the outer eccentric sleeve will not rotate during this process.

Further, the structure of the revolution adjustment component is optimized, and the following specific scheme is cited here: the revolution adjustment component includes a revolution worm wheel and a revolution worm, the revolution worm wheel is connected to the outer eccentric sleeve and drives the outer eccentric sleeve to rotate synchronously, and the revolution worm rotates under the transmission drive of the revolution motor. A reduction mechanism can be set between the revolution motor and the revolution worm, and a reduction mechanism with an appropriate speed ratio is selected according to the required output speed.

Furthermore, 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 scheme is cited: the fixing sleeve on the outer eccentric shaft is provided with a cushion sleeve, and the revolving worm gear is connected and fixed to the cushion sleeve. After such arrangement, the revolving worm gear and the outer eccentric sleeve can rotate synchronously to prevent slipping.

Furthermore, the function of the self-rotating shaft is to drive the grinding wheel to rotate, and its structure is not uniquely determined. Here, an optimization is performed and one of the specific feasible solutions is given: the self-rotating shaft includes a main transmission shaft and an input shaft connected coaxially, the main transmission shaft is connected to the driving motor, and the end of the input shaft is provided with a chuck for clamping the grinding wheel. As one of the multiple feasible options, the input shaft can be set according to the specific working environment, and its length, shaft diameter, etc. are also convenient for disassembly, maintenance and replacement, which can increase convenience in the operation of the grinding device.

Furthermore, the structure of the input shaft and the main transmission 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, the grinding rod support sleeve is connected to the inner eccentric sleeve and rotates coaxially. The grinding rod support sleeve rotates synchronously with the inner eccentric sleeve, and can protect the grinding rod support sleeve.

Furthermore, in order to protect each component and prevent external impurities from affecting the operation of the component, the entire mill device also includes a chassis, and the self-rotating shaft, inner eccentric sleeve, outer eccentric sleeve, feed adjustment component and revolution adjustment component are all arranged in the chassis, and a plurality of bearings matching with the outer eccentric sleeve are arranged in the chassis. When arranged 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:

The present invention drives the grinding wheel to rotate for grinding by a rotating shaft, and an outer eccentric sleeve is arranged to drive the rotating shaft to perform orbital motion, thereby improving the grinding effect; an inner eccentric sleeve is arranged to adjust the radial feed amount of the rotating shaft, thereby better controlling the grinding accuracy and being able to grind hole types of more sizes.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

FIG1 is a schematic diagram of the overall structure of a grinding mill device;

FIG2 is an enlarged schematic diagram of the local structure at A in FIG1 ;

FIG3 is a schematic diagram of the longitudinal cross-sectional structure of the grinding mill device;

FIG4 is an enlarged schematic diagram of the local structure at B in FIG3 ;

FIG5 is an enlarged schematic diagram of the local structure at C in FIG3;

FIG6 is an enlarged schematic diagram of the local structure at D in FIG3;

FIG7 is a schematic cross-sectional view of the structure along the B-B plane in FIG3 ;

Fig. 8 is a schematic cross-sectional view of the structure along the C-C plane in Fig. 3;

Fig. 9 is a schematic cross-sectional view of the structure along the D-D plane in Fig. 3;

Figure 10 is a schematic cross-sectional view of the structure of the mill device and the rolling mill housing.

The meanings of the numbers in the accompanying drawings are as follows: 1. chassis; 7. feed handle; 8. rocker; 9. handle cover; 10. feed worm; 11. feed worm wheel; 12. first ring gear; 13. planetary gear; 14. main transmission shaft; 15. pulley; 16. inner eccentric sleeve; 17. tapered roller bearing; 18. outer eccentric sleeve; 19. revolving worm wheel; 20. bushing; 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. planetary carrier; 32. needle roller; 33. second ring gear; 34. frame.

DETAILED DESCRIPTION

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

It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. The specific structural and functional details disclosed herein are only used to describe the exemplary embodiments of the present invention. However, the present invention can be embodied in many alternative forms, and it should not be understood that the present invention is limited to the embodiments set forth herein.

Example

This embodiment adjusts and explains the grinding device of the three-roller star mill. The inner hole of the frame of the three-roller mill is used to set the roller shaft of the roller wheel. The roller shaft is precisely installed to ensure the stability and reliability of the roller shaft during the rolling process. As shown in Figure 10, the grinding device in this embodiment grinds the inner hole to achieve the accuracy of the inner hole. Since the inner hole includes multiple stepped holes of different sizes, it can also be adjusted and polished by the grinding device in this embodiment.

Specifically, as shown in Figures 1, 2 and 3, the present embodiment discloses an adjustable grinding machine device for processing the inner hole of a three-roller star-shaped precision rolling mill frame 34, including a rotating shaft for mounting a grinding wheel 26, the rotating shaft rotates under the drive of a driving motor; the transmission shaft is provided with an inner eccentric sleeve 16 which rotates relative to the transmission shaft, the inner eccentric sleeve 16 is connected to a radial feed adjustment component and is controlled to rotate by the radial feed adjustment component; the inner eccentric sleeve 16 is provided with an outer eccentric sleeve 18, the outer eccentric sleeve 18 is connected to a revolution adjustment component and is controlled to rotate by the revolution adjustment component.

In the above disclosed grinding machine device, 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 rotates under the control of the revolution adjustment component. The self-rotating shaft is eccentrically arranged relative to the outer eccentric shaft, so the self-rotating shaft can realize revolution while rotating. By processing the grinding surface in such a path, a hole surface with precise size can be obtained. The inner eccentric sleeve 16 realizes rotation under the control of the feed adjustment component, and the self-rotating shaft is directly eccentrically arranged in the inner eccentric sleeve 16. The rotation of the inner eccentric sleeve 16 adjusts the revolution radius of the self-rotating shaft, so that the grinding machine can be applied to more processing objects and can grind holes of more sizes.

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

Preferably, the first sun gear 30 is connected to the inner eccentric sleeve 16 via a key, and the first sun gear 30 and the inner eccentric sleeve 16 are coaxially arranged and rotate coaxially.

The feed adjustment component is not often turned on and operated, and is only operated when the feed amount of the grinding wheel 26 needs to be adjusted. Here, the structure of the feed adjustment component is optimized, and the following feasible solutions are given: the feed adjustment component also includes a feed drive component 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 option, a specific solution is cited here: as shown in Figure 2, the feed drive assembly includes a feed handle 7 arranged on the feed worm 10, the feed handle 7 is fastened to the feed worm 10 through a handle gland 9, and the feed handle 7 is provided with a rocker 8 for driving the feed worm 10 to rotate. When the feed amount is adjusted by adopting this structure, the rocker 8 can be shaken to drive the handle to rotate, thereby driving the worm to rotate, and the feed amount can be adjusted.

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

In order to prevent the revolution adjustment of the outer eccentric sleeve 18 and the feed adjustment of the inner eccentric sleeve 16 from interfering with each other, the structure of the outer eccentric sleeve 18 is optimized. Specifically, the following feasible solutions are given: as shown in Figures 4, 8 and 9, the outer eccentric sleeve 18 is connected to the second planetary gear structure, and the second sun gear 28 of the second planetary gear structure is sleeved on the outer eccentric sleeve 18. The second planetary gear structure is fixedly connected to the planetary carrier 31 of the first planetary gear structure or shares a planetary carrier 31. When sharing a planetary carrier 31, the planetary carrier 31 is provided with two mounting surfaces for mounting planetary gears.

The first planetary gear structure and the second planetary gear structure are further optimized and improved, and the following feasible solution is specifically proposed: there is a circumferential overlap section between the first gear ring 12 of the first planetary gear structure and the second gear ring 33 of the second planetary gear structure, and a sliding contact component or a rolling contact component is arranged in the circumferential overlap section.

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

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

When performing the revolution adjustment, the outer eccentric sleeve 18 is driven to rotate by the revolution adjustment component, and 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; since the inner teeth in the feed adjustment component are fixedly arranged on the feed worm gear 11, the feed adjustment component will not rotate without the driving force, but the planetary carrier 31 of the first planetary gear structure and the second planetary gear structure are connected and fixed or the two share the planetary carrier 31, and the planetary gear 13 of the first planetary gear structure will follow the planetary gear 13 of the second planetary gear structure to perform the revolution motion, and 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 component, driving the planetary gears and the first sun gear 30 to rotate, and the inner gear 29 rotates and drives the inner eccentric sleeve 16 to rotate to achieve feed adjustment; during this process, the revolution adjustment component does not provide driving force, and the second ring gear 33 in the second planetary gear structure is fixedly arranged. Due to the connection of the planet carrier 31 or the shared planet carrier 31, the planetary gears 13 of the first planetary gear structure and the second planetary gear structure will not perform orbital motion, and the outer eccentric sleeve 18 will not rotate during this process.

This embodiment optimizes the structure of the revolution adjustment component, and the following specific solutions are cited here: As shown in Figure 8, the revolution adjustment component includes a revolution worm wheel 19 and a revolution worm 27. The revolution worm wheel 19 is connected to the outer eccentric sleeve 18 and drives the outer eccentric sleeve 18 to rotate synchronously. The revolution worm 27 rotates under the transmission drive of the revolution motor. A reduction mechanism can be set between the revolution motor and the revolution worm 27, and a reduction mechanism with an appropriate speed ratio is selected according to the required output speed.

When installing the revolving worm gear 19, the revolving worm gear 19 is coaxially arranged with the outer eccentric sleeve 18. Here, the installation structure of the revolving worm gear 19 is optimized, and the following specific feasible scheme is cited: the fixing sleeve on the outer eccentric shaft is provided with a cushion sleeve 20, and the revolving worm gear 19 is connected and fixed to the cushion sleeve 20. After such arrangement, the revolving worm gear 19 and the outer eccentric sleeve 18 can rotate synchronously to prevent slipping.

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

Preferably, the chuck 25 is a combination of a chuck 25A and a chuck 25B which are 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 extends out of the inner eccentric sleeve 16 and the outer rotating sleeve of the input shaft 24 is provided with a grinding rod support sleeve 23, which is connected to the inner eccentric sleeve 16 and rotates coaxially. The grinding rod support sleeve 23 rotates synchronously with the inner eccentric sleeve 16, and can protect the grinding rod support sleeve 23. In this embodiment, the grinding rod support sleeve 23 is tightly connected to the end of the inner eccentric shaft by bolts.

In order to protect each component and prevent external impurities from affecting the operation of the components, the entire mill device also includes a chassis 1, and the self-rotating shaft, inner eccentric sleeve 16, outer eccentric sleeve 18, feed adjustment component and revolution adjustment component are all arranged in the chassis 1. The chassis 1 is provided with a plurality of bearing components that cooperate with the outer eccentric sleeve 18. When arranged in this way, the chassis 1 plays a role of supporting and protecting the internal components.

Preferably, two bearing holes are provided in the chassis 1, one bearing hole is close to the revolution adjustment assembly, two deep groove ball bearings 21 are provided in the bearing hole and are used to connect the outer eccentric sleeve 18, and a bearing spacer is provided between the two deep groove ball bearings 21; one bearing hole is close to the second planetary gear, a tapered roller bearing 17 is provided 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 transmission shaft 14 and the inner eccentric sleeve 16, the inner ring of the bearing is sleeved on the main transmission shaft 14, and the outer ring of the bearing is pressed against the inner eccentric sleeve 16. The end of the main transmission shaft 14 extends out of the chassis 1 and is provided with a pulley 15, and the main transmission shaft 14 is connected to the drive motor through a transmission belt. A sealing structure for blocking impurities is provided on the wall of the chassis 1, and a labyrinth sealing structure can be specifically adopted.

The above are the embodiments of the present invention, but the present invention is not limited to the above optional embodiments. Those skilled in the art can arbitrarily combine the above embodiments to obtain other various embodiments. Anyone can obtain other various forms of embodiments under the enlightenment of the present invention. The above specific embodiments should not be understood as limiting the scope of protection of the present invention. The scope of protection of the present invention should be based on the definition in the claims, and the description can be used to interpret the claims.

Claims (5)

1. An adjustable mill device for processing an inner hole of a three-roller star-shaped precise rolling mill stand, which is characterized in that: the grinding wheel comprises a rotation shaft piece for mounting a grinding wheel (26), wherein the rotation shaft piece comprises a main transmission shaft (14) and an input shaft (24) which are coaxially connected, the main transmission shaft (14) is in transmission connection with a driving motor, a bearing is arranged between the main transmission shaft (14) and an inner eccentric sleeve (16), an inner ring of the bearing is sleeved on the main transmission shaft (14), and an outer ring of the bearing abuts against the inner eccentric sleeve (16); the tail end of the main transmission shaft (14) extends out of the chassis (1) and is provided with a belt wheel (15), and the main transmission shaft (14) is connected with a driving motor through a transmission belt for transmission; the inner eccentric sleeve (16) is connected with the radial feeding adjusting assembly and is controlled to rotate by the radial feeding adjusting assembly; the inner eccentric sleeve (16) is sleeved with an outer eccentric sleeve (18), and the outer eccentric sleeve (18) is connected with the revolution adjusting assembly and is controlled to rotate by the revolution adjusting assembly;

The radial feeding adjusting assembly comprises a feeding worm (10) and a feeding worm wheel (11), wherein a concentric through hole is formed in the feeding worm wheel (11), a first planetary gear structure is arranged at the concentric through hole, internal teeth are arranged in a first sun gear (30) of the first planetary gear structure and are in meshed connection with an internal gear (29) eccentrically arranged with the first sun gear (30), and the internal eccentric sleeve (16) is connected with the internal gear (29) and synchronously rotates along with the internal gear (29);

The radial feed adjusting assembly further comprises a feed driving assembly connected to the worm;

the outer eccentric sleeve (18) is connected with a second planetary gear structure, a second sun gear (28) of the second planetary gear structure is sleeved on the outer eccentric sleeve (18), the second planetary gear structure is fixedly connected with a planet carrier (31) of the first planetary gear structure or shares one planet carrier (31), and when sharing one planet carrier (31), two mounting surfaces for mounting the planetary gears are arranged on the planet carrier (31);

The device also comprises a case (1), wherein a plurality of bearing parts matched with the outer eccentric sleeve (18) are arranged in the case (1);

The revolution adjusting assembly comprises a revolution worm wheel (19) and a revolution worm (27), the revolution worm wheel (19) is connected with the outer eccentric sleeve (18) and drives the outer eccentric sleeve (18) to synchronously rotate, and the revolution worm (27) is driven to rotate by the transmission of the revolution motor.

2. An adjustable mill apparatus for machining an inner bore of a three-roll star precision mill housing as claimed in claim 1, wherein: a circumferential overlapping section is arranged between the first gear ring (12) of the first planetary gear structure and the second gear ring (33) of the second planetary gear structure, and a sliding contact part or a rolling contact part is arranged in the circumferential overlapping section.

3. An adjustable mill apparatus for machining an inner bore of a three-roll star precision mill housing as claimed in claim 1, wherein: the outer eccentric sleeve (18) is fixedly sleeved with a cushion sleeve (20), and the revolution worm wheel (19) is fixedly connected to the cushion sleeve (20).

4. An adjustable mill apparatus for machining an inner bore of a three-roll star precision mill housing as claimed in claim 1, wherein: the end of the input shaft (24) is provided with a chuck (25) for clamping a grinding wheel (26).

5. The adjustable mill apparatus for machining an inner bore of a three-roll star precision mill housing of claim 4, wherein: the input shaft (24) extends out of the inner eccentric sleeve (16), a grinding rod supporting sleeve (23) is arranged on the outer rotating sleeve of the input shaft (24), and the grinding rod supporting sleeve (23) is connected with the inner eccentric sleeve (16) and rotates coaxially.