Precise heavy large-size rotating device

Abstract

The invention belongs to the technical field of machine tool machining, and provides a precise heavy large-size rotating device which comprises a trisection lathe bed, a trisection rotating table is arranged on the top face of the trisection lathe bed in a supporting mode, and a hydrostatic bearing or a hybrid bearing is fixed to the center of the trisection lathe bed. A hydrostatic bearing or hybrid bearing rotating shaft rotationally connected with the hydrostatic bearing or hybrid bearing is arranged in the hydrostatic bearing or hybrid bearing, and a driving gear ring is fixed on the hydrostatic bearing or hybrid bearing rotating shaft; a servo motor is arranged on one side of the trisection lathe bed, the output end of the servo motor is in transmission connection with a planetary reduction gearbox, an output gear is arranged at the tail end of the planetary reduction gearbox, the output gear is in gear engagement with a driving pinion, and the driving pinion is in gear engagement with a driving gear ring; and two sets of servo motors are arranged, so that two sets of driving pinions jointly drive a driving gear ring to rotate, and a trisection type rotating table is driven to rotate through a hydrostatic bearing or a hybrid bearing rotating shaft.

Description

Technical Field

[0001] The invention mainly relates to the technical field of machine tool processing, and in particular to a precision, heavy-duty and large-size rotating device. Background Art

[0002] The traditional large-size rotary table adopts a split structure. The bearing in the center of this structure is fixed with a semicircle. Under the condition of large load or large centrifugal force, the center of the axis will be slightly separated due to the influence of centrifugal force and cutting force, so the rotation accuracy is not high. The driving ring gear is fixed on the rotary table. Due to the influence of the micro-deformation of the rotary table, the accuracy of the driving ring gear is degraded, thereby affecting the indexing accuracy and failing to meet the precision machining requirements. At the same time, the traditional large-scale rotary device adopts a parallel axis gearbox, which has a large number of axes, a large volume and a complicated structure. The gearbox is usually installed at a position far away from the driving ring gear, which cannot meet the gapless setting. Therefore, the servo motor positioning cannot be realized, and only external brake positioning can be used. External brake positioning can easily cause the rotary table to be uneven and the positioning size is not accurate enough. On this basis, a precision heavy-duty large-size rotary device is proposed. Summary of the invention

[0003] 1. Technical problems to be solved by the invention: The present invention provides a precision, heavy-duty, large-size rotating device to solve the technical problems existing in the above-mentioned background technology.

[0004] 2. Technical solution: In order to achieve the above object, the technical solution of the present invention is: A precision heavy-duty large-size rotating device, the rotating device comprising a three-part bed, the top surface of the three-part bed supporting a three-part rotating platform, a hydrostatic bearing or a dynamic and static bearing fixed at the center of the three-part bed, a hydrostatic bearing or a dynamic and static bearing rotating shaft connected to the hydrostatic bearing or the dynamic and static bearing rotating shaft being provided therein, a driving gear ring being fixed on the hydrostatic bearing or the dynamic and static bearing rotating shaft; A servo motor is provided on one side of the three-part bed, and the output end of the servo motor is transmission-connected to a planetary reduction box, and an output gear is provided at the end of the planetary reduction box, and the output gear is engaged with a driving pinion, and the driving pinion is engaged with a driving gear ring; By providing two groups of servo motors, the two groups of driving pinions can jointly drive the driving gear ring to rotate, and the three-part rotating table can be driven to rotate through the hydrostatic bearing or the dynamic and static bearing rotating shaft.

[0005] A further improvement is that the three-part rotating table is fixed by a fastening assembly.

[0006] A further improvement is that the three-part rotating shaft table and the three-part bed are fixed in position by a frame-type tower.

[0007] A further improvement is that: the planetary reduction box comprises a sun gear 1 which is transmission-connected to the servo motor, the outer ring gear of the sun gear 1 is meshed with at least two planetary gears 1, and at least two planetary gears 1 are commonly supported by a planetary bracket 1 which is transmission-connected to the sun gear 1; The end face of the planetary carrier 1 is transmission-connected with a sun gear 2, the outer ring gear of the sun gear 2 is engaged with at least two planetary gears 2, at least two planetary gears 2 jointly support a planetary carrier 2 transmission-connected thereto, and the end face of the planetary carrier 2 is provided with an output gear.

[0008] A further improvement is that the end face of the planetary support 1 is provided with internal teeth, and the gear on the internal teeth engages with the external teeth of the sun gear 2.

[0009] A further improvement is that the outer rings of at least two planetary gears 1 are commonly gear-engaged with an embedded gear ring 1.

[0010] A further improvement is that at least two outer rings of the planetary gears 2 are commonly gear-engaged with an embedded gear ring 2.

[0011] A further improvement is that it also includes an integral gear housing arranged outside the planetary support 1 and the planetary support 2.

[0012] A further improvement is that flange cover 1 and flange cover 2 are respectively provided at both ends of the integral gear housing.

[0013] A further improvement is that it also includes an integral gear housing centering wall arranged at the central part of the integral gear housing.

[0014] 3. Beneficial effects: Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: The precision heavy-duty large-size rotating device provided by the present invention is mainly used in various vertical lathes, vertical turning and milling compound machining centers, vertical grinders, gear hobbing and grinding machines, floor-standing machine tools, gantry machine tools and other heavy machine tools, mainly performing rotation and indexing to achieve continuous and positioning processing; The precision heavy-duty large-size rotating device provided by the present invention adopts an integral rotating shaft table and a fixed bed when the size is less than 5 meters, and adopts a three-part rotating shaft table and a three-part fixed bed when the size is greater than 5 meters. The center of the rotating shaft table adopts a liquid static pressure or dynamic static pressure shaft, and the outer ring of the bed is provided with an adjustable pressure static pressure cavity support, so as to ensure the rotation accuracy and load accuracy; The precision, heavy-duty, large-size rotating device provided by the present invention adopts an integral rotating table or a three-part rotating table, with a centrally fixed static pressure or dynamic pressure bearing forming a full-circular structure, which has high precision and stability. The driving gear ring is fixed on the rotating shaft and is not affected by the centrifugal force or load of the workbench, thereby ensuring the indexing accuracy.

[0015] The precision, heavy-duty, large-size rotating device provided by the present invention adopts a high-precision, heavy-loaded double-row planetary reduction gearbox, which is small in size and high in precision. The input torque and output torque axes have only one parallel axis, so a servo motor can be used for precise indexing and positioning. A dual-motor dual-planetary gear structure is adopted, and a spiral ring gear is used for the rotating ring gear. The axial size is adjusted by the spiral pinion of the double planetary reduction gearbox, thereby realizing gapless drive, and high-precision gapless positioning is achieved through the positive and negative torque positioning method of the servo motor.

[0016] The middle section of the three-part rotating table of the precision heavy-duty large-size rotating device provided by the present invention is integral, so whether it is load-bearing or guiding, it can fully ensure that it is at the optimal load-bearing and rotation center, and the rotation accuracy will not be reduced due to the load. The three-part rotating shaft table and the three-part bed adopt a frame-type center positioning connection, and the auxiliary supporting bed and rotating table can ensure that the whole is not affected by deformation to the greatest extent. At the same time, each section of the three-part bed has horizontal bolts all around, which can best form a whole and stabilize it on the foundation, thereby avoiding the deformation factor of the three-part bed under stress.

[0017] The precision, heavy-duty, large-size rotating device provided by the present invention can be applied to various high-demand rotating processes and processing procedures, such as internal teeth, external teeth, milling teeth, grinding teeth, indexing positioning, and large-scale turning, milling, grinding, gear making and other composite processes, and the overall processing technology of slewing support bearings. It is the most effective precision processing device for current rotating processing devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 A cross-sectional view of Figure 3 A schematic diagram of the structure of a planetary reduction gearbox provided by the present invention; Figure 4 for Figure 4 Schematic diagram of the split state structure; Figure 5 It is a schematic diagram of the connection relationship structure of the planetary bracket.

[0019] Reference numerals: 1-servo motor; 2-sun gear 1; 3-planet gear 1; 4-planet carrier 1; 5-sun gear 2; 6-planet gear 2; 7-planet carrier 2; 8-output gear; 9-embedded gear ring 1; 10-embedded gear ring 2; 11-integral gear housing; 12-integral gear housing centering wall; 13-right-angle arc gear set; 14-integral output shaft type planet carrier; 15-flange cover 1; 16-flange cover 2; 17-three-part bed; 18-three-part rotary table; 19-hydrostatic bearing or dynamic and static bearing; 20-hydrostatic bearing or dynamic and static bearing rotating shaft; 21-driving gear ring; 22-driving pinion. DETAILED DESCRIPTION

[0020] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "page", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", "provided with", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] It should be noted that the structures not introduced in the present invention all adopt the existing technology because they do not involve the design points and improvement directions of the present invention.

[0025] Reference Figure 1-3 The present embodiment provides a precision, heavy-duty, large-size rotating device, which includes a three-part bed 17, the top surface of which supports a three-part rotating platform 18, a hydrostatic bearing or a dynamic and static bearing 19 is fixed at the center of the three-part bed 17, a hydrostatic bearing or a dynamic and static bearing 19 is provided inside the hydrostatic bearing or the dynamic and static bearing 19 with a hydrostatic bearing or a dynamic and static bearing rotating shaft 20 connected thereto for rotation, and a driving gear ring 21 is fixed on the rotating shaft of the hydrostatic bearing or the dynamic and static bearing 20; A servo motor 1 is provided on one side of the three-part bed 17, and the output end of the servo motor 1 is transmission-connected to a planetary reduction box, and an output gear 8 is provided at the end of the planetary reduction box, and the output gear 8 is gear-engaged with a driving pinion 22, and the driving pinion 22 is gear-engaged with a driving ring gear 21; By providing two groups of servo motors 1, two groups of driving pinions 22 can jointly drive the driving gear ring 21 to rotate, and the rotating shaft 20 can drive the three-part rotating table 18 to rotate through the hydrostatic bearing or the dynamic and static bearing.

[0026] The precision heavy-duty large-size rotating device provided by the present invention adopts an integral rotating shaft table and a fixed bed when the size is less than 5 meters, and adopts a three-part rotating shaft table and a three-part fixed bed when the size is greater than 5 meters. The center of the rotating shaft table adopts a liquid static pressure or dynamic static pressure shaft, and the outer ring of the bed is provided with an adjustable pressure static pressure cavity support, so as to ensure the rotation accuracy and load accuracy; The precision, heavy-duty, large-size rotating device provided by the present invention adopts an integral rotating table or a three-part rotating table, with a centrally fixed static pressure or dynamic pressure bearing forming a full-circular structure, which has high precision and stability. The driving gear ring is fixed on the rotating shaft and is not affected by the centrifugal force or load of the workbench, thereby ensuring the indexing accuracy.

[0027] The precision, heavy-duty, large-size rotating device provided by the present invention adopts a high-precision, heavy-loaded double-row planetary reduction gearbox, which is small in size and high in precision. The input torque and output torque axes have only one parallel axis, so a servo motor can be used for precise indexing and positioning. A dual-motor dual-planetary gear structure is adopted, and a spiral ring gear is used for the rotating ring gear. The axial size is adjusted by the spiral pinion of the double planetary reduction gearbox, thereby realizing gapless drive, and high-precision gapless positioning is achieved through the positive and negative torque positioning method of the servo motor.

[0028] In a preferred embodiment, the three-part rotating table 18 is fixed by fastening components. The middle section of the three-part rotating table of the precision, heavy-duty and large-size rotating device provided by the present invention is integral, so whether it is load-bearing or guiding, it can fully ensure that it is at the optimal load-bearing and rotation center, and the rotation accuracy will not be reduced due to the load.

[0029] In a preferred embodiment, the three-part rotating shaft table 18 and the three-part bed 17 adopt a frame-type tower fixed position structure, the three-part rotating shaft table and the three-part bed adopt a frame-type central positioning connection, and the auxiliary supporting bed and rotating table can ensure that the whole is not affected by deformation to the greatest extent. At the same time, each section of the three-part bed has horizontal bolts on all sides, which can best form a whole and stabilize it on the foundation, thereby avoiding deformation factors when the three-part bed is under stress.

[0030] In a preferred embodiment, the planetary reduction box includes a sun gear 2 which is transmission-connected to the servo motor 1, the outer ring gear of the sun gear 2 is engaged with at least two planetary gears 3, and at least two planetary gears 3 are jointly supported by a planetary bracket 4 which is transmission-connected thereto; The end face of the planetary carrier 1 4 is internally transmission-connected with a sun gear 2 5, and the outer ring gear of the sun gear 2 5 is meshed with at least two planetary gears 2 6, and at least two planetary gears 2 6 jointly support a planetary carrier 2 7 transmission-connected thereto, and the end face of the planetary carrier 2 7 is provided with an output gear 8, wherein the end face of the planetary carrier 2 7 is transmission-connected with an integral output shaft type planetary carrier 14, and the integral output shaft type planetary carrier 14 is provided with an output gear 8 on the outside.

[0031] In this embodiment, the sun gear, planetary gears and inner ring gear are all made of high-quality alloy steel that is carburized, the tooth surface hardness reaches HRC50° or above, all teeth are spiral teeth, the gear accuracy reaches level 5 or above, and all gears and planetary carriers adopt a double-end bearing fixed axis structure.

[0032] The precision heavy-duty planetary reduction gearbox provided by the present invention adopts an integral alloy steel housing inlaid with a double-row inner gear ring. The centering wall of the integral gear housing positions the inner gear ring, sun gear, planetary gear and planetary bracket at the center of the integral gear housing. The sun gear, planetary gear and inner gear ring are all carburized with high-quality alloy steel, and the tooth surface hardness reaches HRC50° or above. The tooth profile is all spiral teeth, and the gear accuracy reaches above level 5. All gears and planetary brackets adopt a double-end bearing fixed axis structure. There is no slippage when the sun gear and the planetary gears rotate, thus ensuring the accuracy of the rotation indexing and the normal use of the reducer. Since all gears are hard-surface gears, the output torque and bending torque are very large. When the output is 100,000 Nm, the diameter of the gearbox does not exceed 700mm, and the indexing and positioning accuracy can reach more than 3 arc seconds.

[0033] In a preferred embodiment, the end face of the planetary carrier 1 4 is provided with internal teeth, the gear on the internal teeth engages with the external teeth of the sun gear 2 5 , and the internal spline of the planetary carrier 1 4 is connected to the sun gear 2 5 .

[0034] In a preferred embodiment, the outer rings of at least two planetary gears 3 are commonly gear-engaged with an embedded ring gear 9.

[0035] In a preferred embodiment, the outer rings of at least two planetary gears 2 6 are commonly gear-engaged with an embedded ring gear 2 10 .

[0036] This embodiment also includes an integral gear housing 11 arranged outside the planetary bracket 1 4 and the planetary bracket 2 7, and the integral gear housing 11 is used to wrap the embedded ring gear 1 9, the embedded ring gear 2 10, the sun gear 1 2, the sun gear 2 5, the planetary gear 1 3, the planetary gear 2 6, the planetary bracket 1 4 and the planetary bracket 2 7.

[0037] In a preferred embodiment, flange cover 15 and flange cover 2 16 are respectively provided at both ends of the integral gear housing, and the flange cover bearing is fixed at the center of the flange cover. The flange cover presses the embedded gear ring, and the flange cover serves as an installation flange, a planetary bracket bearing seat and an embedded gear ring pressure cover.

[0038] This embodiment also includes an integral gear housing centering wall 12 arranged at the central part of the integral gear housing 11, and the integral gear housing centering wall 12 is used to position the embedded gear ring 1 9, the embedded gear ring 2 10, the sun gear 1 2, the sun gear 2 5, the planetary gear 1 3, the planetary gear 2 6, the planetary bracket 1 4 and the planetary bracket 2 7 at the center of the integral gear housing 11.

[0039] The planetary reducer provided by the present invention has a smaller overall size and can reduce speed by 30-60 times at a time. It can realize parallel connection of multiple planetary reducers to drive a rotating shaft table. Multiple servo motors drive the planetary gear combination to rotate with an output torque of more than 1 million Nm, which can push a workpiece of up to 1,000 tons. The indexing accuracy can reach 5 arc seconds. It is the best device for driving the rotating table of new composite machine tools such as turning, milling, grinding, and gear making.

[0040] In this embodiment, the output shaft of the servo motor 1 is connected to the sun gear 2 through a right-angle arc gear set 13 (such as a helical gear ring), thereby realizing the vertical input of the servo motor 1 and the planetary reduction box.

[0041] The above-described embodiments only express a certain implementation mode of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. Precision heavy-duty large-size rotating device, characterized by: The rotating device comprises a three-part bed, the top surface of the three-part bed supports a three-part rotating platform, a hydrostatic bearing or a dynamic and static bearing is fixed at the center of the three-part bed, a hydrostatic bearing or a dynamic and static bearing rotating shaft is provided in the hydrostatic bearing or the dynamic and static bearing, and a driving gear ring is fixed on the hydrostatic bearing or the dynamic and static bearing rotating shaft; A servo motor is provided on one side of the three-part bed, and the output end of the servo motor is transmission-connected to a planetary reduction box, and an output gear is provided at the end of the planetary reduction box, and the output gear is engaged with a driving pinion, and the driving pinion is engaged with a driving gear ring; By providing two groups of servo motors, the two groups of driving pinions can jointly drive the driving gear ring to rotate, and the three-part rotating table can be driven to rotate through the hydrostatic bearing or the dynamic and static bearing rotating shaft.

2. The precision heavy-duty large-size rotating device according to claim 1 is characterized in that: The three-part rotating table is fixed by fastening components.

3. The precision heavy-duty large-size rotating device according to claim 1 is characterized in that: The three-part rotating shaft table and the three-part bed are fixed in a frame-type tower.

4. The precision heavy-duty large-size rotating device according to claim 1 is characterized in that: The planetary reduction box comprises a sun gear 1 which is transmission-connected to the servo motor, the outer ring gear of the sun gear 1 is meshed with at least two planetary gears 1, and at least two planetary gears 1 are jointly supported by a planetary bracket 1 which is transmission-connected to the sun gear 1; The end face of the planetary carrier 1 is transmission-connected with a sun gear 2, the outer ring gear of the sun gear 2 is engaged with at least two planetary gears 2, at least two planetary gears 2 jointly support a planetary carrier 2 transmission-connected thereto, and the end face of the planetary carrier 2 is provided with an output gear.

5. The precision heavy-duty large-size rotating device according to claim 1 is characterized in that: The end surface of the planetary support 1 is provided with internal teeth, and the gear on the internal teeth is engaged with the external teeth of the sun gear 2.

6. The precision heavy-duty large-size rotating device according to claim 1 is characterized in that: The outer rings of at least two planetary gears 1 are jointly gear-engaged with an embedded ring gear 1.

7. The precision heavy-duty large-size rotating device according to claim 1 is characterized in that: The outer rings of at least two planetary gears 2 are commonly gear-engaged with an embedded gear ring 2.

8. The precision heavy-duty large-size rotating device according to claim 1 is characterized in that: It also includes an integral gear housing arranged outside the planetary support 1 and the planetary support 2.

9. The precision, heavy-duty, large-size rotating device according to claim 8, characterized in that: The two ends of the integral gear housing are respectively provided with a flange cover 1 and a flange cover 2.

10. The precision, heavy-duty, large-size rotating device according to claim 1, characterized in that: It also includes an integral gear housing centering wall arranged at the central portion of the integral gear housing.

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