Turn-milling rotary table rotation driving unit

Abstract

The utility model discloses a turn-milling rotary table rotation driving unit, which relates to the technical field of rotary table driving equipment and comprises a speed reducer base, a rotary table is rotatably mounted at the top of the speed reducer base, a driving gear ring is fixedly arranged on the rotary table, and the driving gear ring is in transmission connection with an even number of driving gears. Each driving gear is in transmission connection with a motor through a speed reducing mechanism, and the driving gears, the speed reducing mechanisms and the motors are arranged in the speed reducer base. The rotary table is fixedly provided with a feedback shaft, and the speed reducer base is provided with an encoder matched with the feedback shaft. Therefore, by utilizing a motor anti-backlash technology, an even number of rotary driving units are arranged to control the rotary motion of the rotary table, so that the rotary table is suitable for heavy load, and the rotary precision is improved at the same time.

Description

TECHNICAL FIELD

[0001] The utility model relates to a rotary table driving device technical field, concretely relates to a rotary table rotary drive unit of turning and milling. BACKGROUND

[0002] In order to adapt to the development of large mechanical equipment, the development trend of numerical control machine tool is mainly large and heavy, the larger the volume of machine tool is, the longer the stroke is, and the higher the transmission precision requirement is. Taking the rotary table driving of numerical control machine tool as an example, the driving force of rotary table comes from motor, and the motor is reduced through speed reducer, and the speed of rotary table is controlled through driving gear ring. There are many types of speed reducers, including planetary reducer, RV cycloid reducer, harmonic reducer and the like, which all play the role of matching speed and transmitting torque, and the driving gear ring adopts zero-gap precision speed reducer, which is the highest precision driving mode in theory.

[0003] Limited by the transmission characteristics of gear, in order to avoid the phenomenon of " lock " of two relative gears when driving gear ring, there must be a sliding gap ( namely transmission gap) between speed reducer and gear ring, therefore, no matter what manufacturing process or structure technology is adopted by the manufacturer, the transmission gap cannot be eliminated.

[0004] In order to improve transmission precision, the usual method is to reduce transmission gap, some manufacturers apply a certain pre-tightening force to the speed reducer, or always keep a certain compression force by using disc spring, but when the transmitted torque is greater than the compression force, the speed reducer will increase the transmission gap due to torque deformation. At present, the positive and negative gaps of the precision planetary transmission speed reducer used in numerical control machine tool are generally between 1-5 arc minutes. The higher precision speed reducer is extremely expensive, generally relies on import, and the maintenance cost is extremely high, so it is difficult to popularize. Some precision driving equipment can also adopt torque motor direct driving technology, that is, torque motor directly drives rotary table rotation. The precision of torque motor is high, and the control is convenient, but it is generally only suitable for small machine tool rotary table ( such as cradle type), and torque motor direct driving technology is currently used in cradle rotary table. When machining, the angle of rotary table can be adjusted at any time, and the included angle between workpiece and machining tool is changed. Limited by the huge inertia generated by the rotation of large workpiece, the maximum bearing capacity of cradle rotary table is about 1 ton, so it is only suitable for machining small workpiece. For some rotary tables with large volume, torque motor has poor carrying capacity and rigidity, and cannot meet the torque output demand of heavy load and high rigidity. UTILITY MODEL CONTENTS

[0005] In order to overcome the above defects, the utility model aims at providing a rotary table rotary drive unit of turning and milling, which utilizes motor gap elimination technology, sets an even number of rotary drive units to control the rotary motion of rotary table, is suitable for heavy load, and improves the rotary precision.

[0006] In order to achieve the above object, the utility model provides a kind of rotary drive unit of turning table of turning-milling, it is characterized by comprising:

[0007] The bottom of the speed reducer is provided with a feedback shaft, and the speed reducer is provided with an encoder matched with the feedback shaft.

[0008] Preferably, the speed reduction mechanism is a planetary speed reduction mechanism.

[0009] Preferably, the planetary speed reduction mechanism includes a housing, a sun gear, a planetary carrier, a planetary gear and a planetary carrier output shaft, the housing is fixedly connected with the speed reducer, the housing is provided with an internal gear ring, the sun gear is drivingly connected with the motor shaft, the planetary gear is rotatably installed on the planetary carrier, and the sun gear is engaged with the internal gear ring through the planetary gear.

[0010] Preferably, a two-stage speed reduction mechanism is provided between the sun gear and the motor.

[0011] Preferably, the two-stage speed reduction mechanism includes a box body, a driving input shaft, an intermediate shaft and a driving output shaft are rotatably installed in the box body, the driving output shaft is coaxially arranged with the driving input shaft, and the output end of the driving output shaft is drivingly connected with the sun gear.

[0012] The driving input shaft is drivingly connected with the motor shaft, the driving input shaft is provided with a driving gear, the intermediate shaft is provided with an intermediate shaft pinion and an intermediate shaft gear, a two-shaft transmission gear is slidingly arranged on the driving output shaft, and the two-shaft transmission gear is selectively engaged with the driving input gear or the intermediate shaft pinion.

[0013] Preferably, the driving gear ring is an internal gear ring.

[0014] Preferably, the driving gear ring is an external gear ring.

[0015] Preferably, the speed reducer is provided with a mounting base, the speed reduction mechanism is mounted on the mounting base, a closed cavity is formed between the mounting base and the rotary table, the mounting base is provided with a center hole, the feedback shaft is arranged in the center hole and corresponds to the encoder.

[0016] Preferably, a first sealing device is arranged between the slewing table and the speed reducer base, and a second sealing device is arranged between the feedback shaft and the central hole.

[0017] After the above technical scheme is adopted, the utility model has the beneficial technical effects of:

[0018] 1. By utilizing the principle of double-motor anti-backlash, a plurality of rotary driving units are arranged, and an encoder is arranged at the bottom of the slewing table, which cooperates with a plurality of motors to ensure that, when the slewing table is working, at least one driving gear generates a tension force with the driving gear ring of the slewing table, so that the situation that the output torque of the motor is zero at the same time is never occurred, and under the action of the torque, the movement gap of the main gear cannot exist, thereby ensuring the stability of the output.

[0019] 2. Since the servo motor is connected with the driving gear through the planetary speed reducer mechanism, the planetary speed reducer mechanism can reduce the output rotating speed of the servo motor, and a plurality of servo motors of the same type are used to drive the pinion gears, so that the planetary speed reducer mechanism can also increase the output torque, and thus is more suitable for heavy load, especially for driving of the slewing table with large size. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the internal schematic view of the planetary speed reducer mechanism of the utility model;

[0021] Figure 2 is the use state (internal gear ring) reference schematic view of the two-stage speed reducer mechanism of the utility model;

[0022] Figure 3 is the explosion state reference schematic view of the planetary speed reducer mechanism of the utility model;

[0023] Figure 4 is the use state (external gear ring) reference schematic view of the two-stage speed reducer mechanism of the utility model;

[0024] Figure 5 is the use state reference schematic view of the utility model in which one gear is used as a speed reducer mechanism;

[0025] In the drawings,

[0026] 1. Speed reducer base; 11. Feedback shaft; 12. Mounting base plate;

[0027] 2. Slewing table; 21. Driving gear ring; 22. Encoder; 23. Driving gear;

[0028] 3, planetary reduction mechanism; 31, motor shaft; 311, sun gear; 32, planet carrier; 321, planet carrier output shaft; 322, planet gear; 33, intermediate shaft; 331, intermediate shaft pinion; 332, intermediate shaft gear; 34, main power output shaft; 341, two-shaft transmission gear; 35, housing; 351, inner ring gear; 36, box; 37, main power input shaft; 371, main power gear;

[0029] 4, motor. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will be further described in detail in combination with the drawings and examples, and it should be understood that the specific examples described here are only used to explain the utility model, and are not used to limit the utility model.

[0031] Referring to Figures 1-3 The utility model provides a kind of turning and milling rotary table rotary drive unit, comprising: reduction gear base 1, the top of reduction gear base 1 is rotatably installed with rotary table 2, rotary table 2 is fixedly provided with driving gear ring 21, driving gear ring 21 is drivingly connected with even number of driving gears 23, each driving gear 23 is drivingly connected with a motor 4 by a reduction mechanism, and driving gear 23, reduction mechanism and motor 4 are arranged in the inside of reduction gear base 1;Rotary table 2 is fixedly provided with feedback shaft 11, and reduction gear base 1 is provided with encoder 22 or round grating matched with feedback shaft 11.The motor 4 in the utility model is preferably selected servo motor.According to the mechanical common knowledge of double-motor clearance elimination, the utility model generally adopts even number of driving gears 23 and driving gear ring 21 meshing transmission, and generally preferably 2, 4, 6 or 8 driving gears 23.

[0032] The reduction mechanism of the utility model is planetary reduction mechanism 3.The planetary reduction is relatively mature prior art, and after using planetary reduction, stable output power can be obtained.When a plurality of driving gears 23 are used to drive the same gear ring, not only transmission clearance can be eliminated, but also larger output torque can be obtained, suitable for large rotary table 2.Referring to Figure 5 The reduction mechanism of the utility model can also be directly replaced by a gear, with lower cost, but relatively lower precision, since planetary reduction machine has compact structure, large reduction ratio and high precision, so the planetary reduction machine structure is preferably selected.

[0033] Referring to Figure 1 And Figure 3The utility model discloses a planetary reduction mechanism 3 including shell 35, sun gear 311, planet carrier 32, planetary gear 322 and planet carrier output shaft 321, shell 35 with fixed connection of reduction gear base 1, shell 35 is provided with internal toothed ring 351, sun gear 311 is transmission connection with motor shaft 31, planetary gear 322 rotates and is installed in planet carrier 32, and sun gear 311 is engaged with internal toothed ring 351 through planetary gear 322, planet carrier output shaft 321 is fixed connection with planet carrier 32, and can also be integrally formed, and planet carrier output shaft 321 is fixed connection with drive gear 23. Sun gear 311 is directly connected with motor shaft 31 of motor 4, and a plurality of planetary gear 322 rotates around sun gear 311, and power is transmitted to planet carrier output shaft 321 through planet carrier 32, and drive gear 23 is transmission connection with driving gear ring 21, and motor power is transmitted to driving gear ring 21 in this way. Driving gear ring 21 is internal toothed ring 351, and also can be external gear ring (see Figure 4 ), and the power transmission of both ways can be realized by planetary reduction mechanism 3.

[0034] The utility model discloses sun gear 311 between motor 4 is provided with two-stage reduction mechanism. Two-stage reduction mechanism includes box 36, and the driving input shaft 37 of rotation installation is installed in box 36, and intermediate shaft 33 and driving output shaft 34, and driving output shaft 34 is coaxial with driving input shaft 37 and is arranged, and the output end of driving output shaft 34 is transmission connection with sun gear 311, and driving input shaft 37 is transmission connection with motor shaft 31, and driving input shaft 37 is provided with driving gear 371, and intermediate shaft 33 is provided with intermediate shaft pinion 331 and intermediate shaft gear 332, and the two-axis transmission gear 341 of sliding is provided on driving output shaft 34, and the two-axis transmission gear 341 can be selected with driving gear 371 or intermediate shaft pinion 331 engagement. Two-stage reduction mechanism is on the basis of one-stage planetary reduction, and a set of gearbox is added at the output end of motor 4, and gear shifting function can be realized, and then the torque of output is increased. The two-axis transmission gear 341 of sliding is on driving output shaft 34, and the two-axis transmission gear 341 can be connected gear shifting mechanism generally, and can be directly transmission connection with driving input shaft 37, and the input speed of driving input shaft 37 can be output to sun gear 311 after speed change through the reduction of intermediate shaft pinion 331 and intermediate shaft gear 332. The intermediate shaft 33 in box 36 can be multiple, and two symmetrical installations are generally preferred, and the modulus of pinion in box 36 is generally small, and multiple gear drive is used to output greater torque.

[0035] The utility model discloses a speed reducer base 1 is provided with the installation base plate 12, and the speed reducer mechanism is installed in the installation base plate 12, and the closed cavity is formed between the installation base plate 12 and the rotary table 2, and the installation base plate 12 is provided with the center hole, and the feedback shaft 11 is set up in the center hole and corresponds with the encoder 22. The installation base plate 12 is a part of the speed reducer base 1, and the motor 4 is fixed with the installation base plate 12 through the motor connecting plate, and the closed cavity is used for sealing, and guarantees the normal operation of internal parts. The motor in the utility model preferably servo motor, satisfies the transmission precision on the basis, and production cost is more easily controlled.

[0036] The utility model discloses a rotary table 2 and speed reducer base 1 between being provided with first sealing device, and feedback shaft 11 and center hole between being provided with second sealing device. First sealing device and second sealing device all are for realizing dynamic sealing, and generally first sealing device and second sealing device preferentially select sealing ring, and center hole is used for placing feedback shaft 11, and installs with encoder 22 or circular grating cooperation, is used for real -time feedback speed, realizes the linkage with other electrical equipment.

[0037] Of course, the utility model can have other various embodiments, and the skilled in the art can make various corresponding changes and deformation according to the utility model without departing from the spirit and essence of the utility model, but these corresponding changes and deformation should all belong to the protection scope of the claims attached to the utility model.

Claims

1. A turning and milling head swivel drive unit, characterized in that The utility model relates to a rotary table drive mechanism, including: The top of reduction gear base is rotatably installed with rotary table, the rotary table is fixed with drive gear ring, the drive gear ring is transmission connection with even number drive gear, every drive gear is transmission connection with a motor through a reduction mechanism respectively, the drive gear, the reduction mechanism and the motor are arranged in the inside of reduction gear base, the rotary table is fixed with feedback shaft, and the reduction gear base is provided with the encoder matched with feedback shaft.

2. The turntable rotary drive unit of claim 1, wherein, The reduction mechanism is planetary reduction mechanism.

3. The turntable rotary drive unit of claim 2, wherein, The planetary reduction mechanism includes shell, sun gear, planet carrier, planet gear and planet carrier output shaft, the shell is fixedly connected with the reduction gear base, the shell is provided with internal gear ring, the sun gear is transmission connection with motor shaft, the planet gear is rotatably installed on the planet carrier, and the sun gear is engaged with the internal gear ring through the planet gear, the planet carrier output shaft is fixedly connected with the planet carrier, and the planet carrier output shaft is transmission connection with the drive gear.

4. The turntable rotary drive unit of claim 3, wherein, The sun gear and the motor are provided with two-stage reduction mechanism.

5. The turntable rotary drive unit of claim 4, wherein, The two-stage reduction mechanism includes box, the box is rotatably installed with driving force input shaft, intermediate shaft and driving force output shaft, the driving force output shaft is coaxially arranged with the driving force input shaft, and the output end of the driving force output shaft is transmission connection with the sun gear. The driving force input shaft is transmission connection with the motor, the driving force input shaft is provided with driving force gear, the intermediate shaft is provided with intermediate shaft pinion and intermediate shaft gear, the driving force output shaft is slidably provided with two-axis transmission gear, and the two-axis transmission gear is selectively engaged with the driving force gear or the intermediate shaft pinion.

6. The turntable rotary drive unit of claim 1, wherein, The drive gear ring is internal gear ring.

7. The turntable rotary drive unit of claim 1, wherein, The drive gear ring is external gear ring.

8. The turntable rotary drive unit of claim 1, wherein, The reduction gear base is provided with mounting base plate, the reduction mechanism is installed on the mounting base plate, the mounting base plate and the rotary table form closed cavity, the mounting base plate is provided with center hole, the feedback shaft is arranged in the center hole and corresponds with the encoder.

9. The turntable rotary drive unit of claim 8, wherein, The rotary table and the reduction gear base are provided with first sealing device, and the feedback shaft and the center hole are provided with second sealing device.

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