High-speed large-torque main transmission system integrated with precise C-axis feeding

Abstract

The invention discloses a high-speed large-torque main transmission system integrated with precise C-axis feeding, which relates to the field of numerical control machine tools, comprises a motor and a spindle box, and is characterized by further comprising a main transmission system arranged in the spindle box and an indexing mechanism arranged on the spindle box, the helical gear horizontal layout is adopted, the fixed end-toothed disc and the movable end-toothed disc are meshed or separated through the movement of the movable end-toothed disc on the C shaft, so that the rapid switching between a C shaft feeding function and a main transmission system can be realized, and the C shaft indexing precision is ensured; the two-gear stepless speed change mechanism has the advantages of being large in speed change range, high in transmission precision, high in indexing precision, excellent in power torque characteristic, high in rotating speed, stable in transmission and compact in structure, two-gear stepless speed change conversion is achieved through conversion matching of different gears on the five shafts, and the main shaft can achieve output conversion of different torques so as to meet the machining requirements of different parts.

Description

Technical Field

[0001] The invention relates to the field of numerically controlled machine tools, and in particular to a high-speed and high-torque main transmission system integrated with a precision C-axis feed. Background Art

[0002] With the rapid development of the manufacturing industry, the demand for domestic substitution of high-end machine tool equipment has become increasingly urgent; in the existing technology, due to the low speed and high torque of the main transmission system used in large and heavy CNC lathes and heavy turning and milling compound machining centers, the C-axis indexing accuracy is suitable for occasions where the machine tool working accuracy is not high; in the new dual-motor anti-backlash main transmission, the speed range is narrow, and the domestic specifications of the functional components of the two-speed reducer are single. At present, it is difficult to solve the high-precision problem of geometric accuracy and working accuracy of the main transmission system of large and heavy-duty turning and milling compound high-end machine tools. Summary of the invention

[0003] The purpose of the present invention is to provide a high-speed, high-torque main transmission system integrated with a precision C-axis feed, aiming to solve the problem of low precision of the existing equipment in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a high-speed and high-torque main transmission system integrated with precision C-axis feed, comprising a motor and a spindle box, wherein shaft I, shaft II, shaft III, shaft IV and shaft V are rotatably arranged in the spindle box from bottom to top, the motor is connected to shaft I through a coupling, a helical gear I is fixedly arranged on shaft I, a helical gear III and a helical gear II meshing with the helical gear I are fixedly arranged on shaft II, a helical gear V, a helical gear VI and a helical gear IV meshing with the helical gear III are fixedly arranged on shaft III, a sliding gear is installed on shaft IV, and the sliding gear can mesh with the helical gear V and the helical gear VI on shaft III respectively by sliding on shaft IV, a helical gear VII is also fixedly arranged on shaft IV, a helical gear VIII meshing with the helical gear VII is fixedly arranged on shaft V, and a dividing mechanism is also included on the spindle box.

[0005] Furthermore, the indexing mechanism includes a servo motor, a reducer, a worm wheel, a worm, a fixed-end gear plate and a movable-end gear plate. The servo motor and the reducer are both arranged on the main spindle box. The output shaft of the servo motor is connected to the reducer. The power output shaft of the reducer is fixedly connected to the worm through a coupling. The movable-end gear plate is sleeved on the shaft V and splined to the outer circumferential surface of the shaft V. A cylinder for driving the movable-end gear plate to move axially is arranged on the main spindle box and located on the outer side of the movable-end gear plate. The output end of the cylinder is fixedly connected with a convex ring convex inwardly. The outer side sleeve of the movable-end gear plate is provided with two thrust ball bearings, and the two thrust ball bearings are separated left and right by the convex ring. A bearing is fixedly sleeved on the shaft V. The worm wheel fixed sleeve is arranged on the outer circumferential surface of the bearing. The worm wheel and the worm are meshed to form a double-lead worm gear transmission pair. The fixed-end gear plate and the movable-end gear plate are cooperated for indexing positioning.

[0006] Furthermore, the sliding gear includes a first helical gear and a second helical gear which are integrally connected, and the first helical gear and the second helical gear are respectively meshed with the helical gear V and the helical gear VI.

[0007] Furthermore, a shift cylinder is provided inside the spindle box, and the sliding gear slides axially on the shaft IV through the drive of the hydraulic cylinder to achieve two states: the first helical gear is meshed with the helical gear V or the second helical gear is meshed with the helical gear VI.

[0008] The present invention has the following beneficial effects: The present invention provides a high-speed, high-torque main transmission system integrated with precision C-axis feeding, which adopts a horizontal layout of helical gears. By moving the movable end gear disc on the C-axis, the fixed end gear disc and the movable end gear disc are engaged or separated with each other, so that the C-axis feeding function and the main transmission system can be quickly switched, and the C-axis indexing accuracy is ensured. The system has the characteristics of a large speed change range, high transmission accuracy, high indexing accuracy, excellent power-torque characteristics, high speed, stable transmission, and compact structure. The conversion and coordination of different gears on five axes realizes two-speed stepless speed conversion, so that the main shaft can realize different torque output conversion to meet the requirements of different parts processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the cylindrical shell worm gear transmission pair of the present invention; Figure 3 for Figure 1 A magnified view of middle; In the figure: 1. motor; 2. spindle box; 3. bevel gear I; 4. bevel gear II; 5. bevel gear III; 6. bevel gear IV; 7. bevel gear V; 8. bevel gear VI; 9. sliding gear; 901. first bevel gear; 902. second bevel gear; 10. bevel gear VII; 11. bevel gear VIII; 12. servo motor; 13. reducer; 14. worm gear; 15. worm; 16. fixed end gear disc; 17. movable end gear disc; 18. oil cylinder; 19. convex ring; 20. thrust ball bearing; 21. guide sleeve; 22. end cover; 23. guide ring. DETAILED DESCRIPTION

[0010] like Figures 1 to 3 As shown, a high-speed and high-torque main transmission system integrated with precision C-axis feed comprises a motor 1 and a spindle box 2, wherein shaft I, shaft II, shaft III, shaft IV and shaft V are rotatably arranged from bottom to top in the spindle box 2, shaft V is the C-axis, the motor 1 is connected to shaft I through a coupling, a helical gear I3 is fixedly arranged on shaft I, a helical gear III5 and a helical gear II4 meshing with the helical gear I3 are fixedly arranged on shaft II, a helical gear V7, a helical gear VI8 and a helical gear IV6 meshing with the helical gear III5 are fixedly arranged on shaft III, a sliding gear 9 is spline-connected on shaft IV, and the sliding gear 9 can respectively mesh with the helical gear V7 and the helical gear VI8 on shaft III by sliding on shaft IV, a helical gear VII10 is also fixedly arranged on shaft IV, a helical gear VIII11 meshing with the helical gear VII10 is fixedly arranged on shaft V, and a dividing mechanism arranged on the spindle box 2 is also included.

[0011] The indexing mechanism includes a servo motor 12, a reducer 13, a worm wheel 14, a worm 15, a fixed end gear plate 16 and a movable end gear plate 17. The worm wheel 14 and the worm 15 mesh to form a double-lead worm gear transmission pair. The servo motor 12 and the reducer 13 are both arranged on the spindle box 2. The output shaft of the servo motor 12 is connected to the reducer 13. The power output shaft of the reducer 13 is seamlessly connected to the double-lead worm gear mechanism through a coupling, so as to realize the function of low-speed, high-torque and high-precision indexing of the C-axis; the movable end The gear disc 17 is sleeved on the shaft V and connected with the outer circumferential surface of the shaft V by a spline. A cylinder 18 for driving the movable end gear disc 17 to move axially is arranged on the main spindle box 2 and located on the outer side of the movable end gear disc 17. Two thrust ball bearings 20 are sleeved on the outer side of the movable end gear disc 17. The two thrust ball bearings 20 are separated by a convex ring 19 convex inwardly. A guide sleeve 21 is arranged between the output end of the cylinder 18 and the convex ring 19. An end cover 22 is arranged on the box body 1 and an annular groove is formed on one side of the end cover 22. A guide ring 23 is threadedly connected to one side of the end cover 22. The free end of the guide sleeve 21 is located inside the annular groove and slides with the inner wall of the annular groove. The inner wall of the guide sleeve 21 slides with the outer wall of the guide ring 23. The oil cylinder 18 drives the guide sleeve 21 to slide and then drives the convex ring 19 to slide. The fixed sleeve on the shaft V is provided with a bearing. The fixed sleeve of the worm gear 14 is arranged on the outer circumferential surface of the bearing. The fixed end gear disc 16 and the movable end gear disc 17 cooperate for indexing positioning; when the oil cylinder 18 is started to push the movable end gear disc 17 to engage with the fixed end gear disc 16 in place, the first proximity switch sends a signal, the servo motor 12 is started, and the torque is transmitted to the fixed end gear disc 16 through the transmission mechanism, driving the fixed end gear disc 16 to rotate, realizing the C-axis indexing function; the oil cylinder 18 is started to make the movable end gear disc 17 move axially and separate from the fixed end gear disc 16. When the two tooth discs are separated in place, the proximity switch sends a signal, and the C-axis indexing function is disconnected. At this time, the motor 1 can control the rotation of the shaft I to realize the normal operation of the transmission system.

[0012] The sliding gear 9 includes a first bevel gear 901 and a second bevel gear 902 which are integrally connected. The first bevel gear 901 and the second bevel gear 902 are meshed with the bevel gear V7 and the bevel gear VI8 respectively.

[0013] A shift cylinder is provided inside the main spindle box 2, and a shift fork is installed horizontally just above one side of the sliding gear 9. The piston rod end of the hydraulic cylinder is fixedly connected to the shift fork, so that the sliding gear 9 is driven by the hydraulic cylinder to slide axially on the shaft IV to achieve two states: the first bevel gear 901 is meshed with the bevel gear V7 or the second bevel gear 902 is meshed with the bevel gear VI8.

[0014] The fixed end of shaft V adopts a combination of double-row cylindrical roller bearings and bidirectional thrust angular contact ball bearings. A precision circular grating is installed at the tail of shaft V and fixed by a flange sleeve at the tail of shaft V. The contacts of the circular grating are installed on the flange plate behind the spindle box 2. The circular grating is driven by the rotation of shaft V to transmit the position feedback signal of the C-axis feed. That is, when the main drive switches to the C-axis feed movement, a position feedback signal is generated between the circular grating and the servo motor 12 to realize the indexing and positioning functions of the C-axis feed; when the C-axis feed is switched to the main drive, the circular grating only serves as a feedback signal for thread processing.

[0015] The specific operation process of the present invention is as follows: The main motion implementation method is: the motor 1 is powered on and rotates, driving the shaft I to rotate through the coupling, and the shaft II is rotated through the meshing of the bevel gear I3 and the bevel gear II4, and the shaft III is rotated again through the meshing of the bevel gear 5 and the bevel gear 6, and the sliding gear 9 on the shaft IV is driven to slide through the shift fork, and finally the first bevel gear 901 is meshed with the bevel gear V7, or the second bevel gear 902 is meshed with the bevel gear VI8 to drive the shaft IV to rotate, and then the bevel gear VIII 11 on the shaft V is driven to rotate through the bevel gear VII 10 fixedly connected to the shaft IV. At this point, the two-speed stepless speed conversion of the shaft V is realized through the whole transmission system, so that the output speed of the spindle box 2 is switched from 5r / min to 560r / min and the spindle output torque is converted, so as to meet the requirements of processing different parts.

[0016] The actual rotation mode of C-axis feed motion is: the oil cylinder 18 pushes the movable end gear disc 17 to slide, so as to realize the rapid switching of the C-axis feed function and the main transmission system. When the movable end gear disc 17 and the fixed end gear disc 16 are meshed in place, the servo motor 12 is decelerated by the precision reducer 13 and rotates at a normal speed, and transmits torque to the fixed end gear disc 16 through the transmission mechanism, driving the fixed end gear disc 16 to rotate, thereby realizing the C-axis indexing function.

Claims

1. A high-speed, high-torque main drive system integrated with a precision C-axis feed, comprising a motor (1) and a spindle box (2), characterized in that: The spindle box (2) is provided with a shaft I, a shaft II, a shaft III, a shaft IV and a shaft V which are rotatably arranged from bottom to top. The motor (1) is connected to the shaft I via a coupling. The shaft I is provided with a helical gear I (3). The shaft II is provided with a helical gear III (5) and a helical gear II (4) which meshes with the helical gear I (3). The shaft III is provided with a helical gear V (7), a helical gear VI (8) and a helical gear IV (6) which meshes with the helical gear III (5). The shaft IV is provided with a sliding gear (9). The sliding gear (9) can respectively mesh with the helical gear V (7) and the helical gear VI (8) on the shaft III by sliding on the shaft IV. The shaft IV is also provided with a helical gear VII (10). The shaft V is provided with a helical gear VIII (11) which meshes with the helical gear VII (10). The spindle box (2) also includes a dividing mechanism arranged on the spindle box (2).

2. A high-speed, high-torque main drive system integrated with precision C-axis feed according to claim 1, characterized in that: The indexing mechanism comprises a servo motor (12), a reducer (13), a worm wheel (14), a worm (15), a fixed end toothed disc (16) and a movable end toothed disc (17); the servo motor (12) and the reducer (13) are both arranged on the main spindle box (2); the output shaft of the servo motor (12) is connected to the reducer (13); the power output shaft of the reducer (13) is fixedly connected to the worm (15) via a coupling; the movable end toothed disc (17) is sleeved on the shaft V and spline-connected to the outer circumferential surface of the shaft V; a gear for driving the movable end toothed disc is arranged on the main spindle box (2) and located outside the movable end toothed disc (17). (17) an axially movable oil cylinder (18), the output end of the oil cylinder (18) is fixedly connected to a convex ring (19) convex inwardly, the outer side of the movable end toothed disc (17) is provided with two thrust ball bearings (20), the two thrust ball bearings (20) are separated by the convex ring (19) on the left and right, the fixed sleeve on the shaft V is provided with a bearing, the worm wheel (14) is fixedly sleeved on the outer circumferential surface of the bearing, the worm wheel (14) and the worm (15) are meshed to form a double-lead worm gear transmission pair, the fixed end toothed disc (16) is fixedly connected to one side end surface of the worm wheel (14) and cooperates with the movable end toothed disc (17) for indexing and positioning.

3. A high-speed, high-torque main transmission system integrated with precision C-axis feed according to claim 1, characterized in that: The sliding gear (9) comprises a first bevel gear (901) and a second bevel gear (902) which are integrally connected, and the first bevel gear (901) and the second bevel gear (902) are respectively meshed with the bevel gear V (7) and the bevel gear VI (8).

4. A high-speed, high-torque main drive system integrated with precision C-axis feed according to claim 2, characterized in that: A shift cylinder is provided inside the spindle box (2), and the sliding gear (9) is driven by the hydraulic cylinder to slide axially on the shaft IV to achieve two states: the first bevel gear (901) is meshed with the bevel gear V (7) or the second bevel gear (902) is meshed with the bevel gear VI (8).

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