CN115302263B

CN115302263B - Small-sized numerical control indexing rotary table device

Info

Publication number: CN115302263B
Application number: CN202211084611.XA
Authority: CN
Inventors: 林斌; 宋蓓; 胡春美; 周靓毅; 刘中华; 林绿高
Original assignee: Zhejiang Chr Intelligent Equipment Co ltd
Current assignee: Zhejiang Chr Intelligent Equipment Co ltd
Priority date: 2022-09-06
Filing date: 2022-09-06
Publication date: 2023-08-08
Anticipated expiration: 2042-09-06
Also published as: CN115302263A

Abstract

The invention discloses a small-sized numerical control indexing rotary table device which comprises a base, wherein a mandrel is arranged on the base, a rotary table is arranged at the upper end of the mandrel on the base, the middle part of the mandrel is connected with a worm gear transmission mechanism, the lower end of the mandrel is provided with an encoder, a group of locking devices are arranged on the base at positions close to a main shaft of the rotary table, the group of locking devices are arranged around the base in a fan shape, and the rotary table can be axially and mechanically locked through the group of locking devices. The beneficial effects of the invention are as follows: the mechanical locking device is arranged, and the locking function is realized by virtue of the locking blocks and the multi-layer flaky clamping grooves of the turntable main shaft; the locking power of the locking device is generated by compressing a plurality of groups of disc springs in a series, and the multi-layer sheet-shaped clamping groove structure enlarges the contact area between the locking block and the middle rotary table, thereby achieving the safe and reliable locking effect.

Description

Small-sized numerical control indexing rotary table device

Technical Field

The invention relates to the technical field of numerical control indexing rotary tables, in particular to a small numerical control indexing rotary table device.

Background

The production and research of basic parts are the 'short leg' of most enterprises in the equipment manufacturing industry of China, particularly various key core basic parts in 'neck' domestic equipment, foreign supplier enterprises continuously start to limit China in various aspects such as part supply, price, supply period, specification and the like, and under the condition, most profits of the machine tool industry are eaten by imported parts and the risk of broken supply and chain breakage exists. Therefore, the situation that key and core parts are dependent on import for a long time and are subject to people is solved as soon as possible, and the method is a common problem faced by equipment manufacturing enterprises.

The small high-load precise numerical control indexing turntable is a core component of wheel disc mortice efficient precise machining broaching equipment, and the wheel disc mortice broaching equipment is used as machining equipment for the tip of national defense industry and is 'neck clamping' high-end equipment which is developed by our national emphasis support. The small-sized high-load-precision numerical control indexing turntable has the outer diameter of only phi 94mm, can process a wheel disc mortise with the outer diameter phi of 100 mm-phi 200mm, and can bear 20 tons of broaching force. The special numerical control indexing turntable is developed in China, and is completely imported from abroad.

The small high-load precise indexing turntable has three main characteristics: 1) The accurate and reliable indexing accuracy, positioning accuracy and repeated positioning accuracy are high (10 ', repeated positioning accuracy is 6'); 2) The bearing capacity is strong, and the bearing capacity can bear the broaching force of more than 20T and the impact force in the broaching state, and the cutting force acts on the edge of the turntable; 3) The mode of mechanical locking of the belleville spring is adopted, and the belleville spring is normally closed, and can be unlocked and released only when indexing is carried out, so that the belleville spring is safe and reliable.

In the broaching process, the wheel disc mortises are different in shape (the wheel disc mortises are mainly in three forms of fir tree shape, gourd shape and dovetail shape), the number of the wheel disc mortises is also different, and the accurate positioning and indexing are required to be carried out through an indexing turntable for different wheel disc specifications so as to ensure the accurate machining of the mortises in the machining process. In addition, the wheel disc materials mainly comprise titanium alloy, stainless steel and high-temperature alloy, and are difficult to process materials, the price is high, the material cost of each wheel disc is hundreds of thousands to millions, each process of the wheel disc mortise must be ensured to be accurate and effective, and the problem of damage to workpieces caused by the problems in links such as indexing and locking of a rotary table is avoided. Therefore, the numerical control indexing turntable has very strict requirements, namely ultrahigh precision indexing and positioning are required, and meanwhile, the requirements of ensuring that the turntable cannot generate angular displacement, flatness and concentricity errors in the precision machining process can be met.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a small numerical control indexing rotary table device which has the advantages of small overall structure, compact layout, safety and reliability.

The technical scheme of the invention is as follows:

the utility model provides a small-size numerical control graduation revolving platform device, includes the base, be equipped with the dabber on the base, be equipped with the revolving stage main shaft on the base in dabber upper end, the dabber middle part is connected with worm gear, the dabber lower extreme is equipped with the encoder, be equipped with a set of locking device on the base in being close to revolving stage main shaft position, and a set of locking device is fan-shaped to arrange around the base, can realize carrying out axial mechanical locking to the revolving stage main shaft through a set of locking device.

Further, locking device includes piston, cylinder cap, belleville spring, lock bolt, latch segment and clamp plate, piston and belleville spring set up respectively in the piston hole of base, and the piston is located belleville spring below position, the cylinder cap sets up in the belleville spring top, and it is spacing in the piston hole with the belleville spring through the cylinder cap, the cylinder cap top is equipped with the latch segment, the latch segment top is equipped with the clamp plate, lock bolt wears to locate clamp plate, latch segment and cylinder cap, and lock bolt upper end and the spacing cooperation of clamp plate, and the lower extreme links to each other with the piston is fixed, and the belleville spring sets up between piston and cylinder cap.

Further, worm gear worm drive mechanism includes worm, worm wheel, servo motor, speed reducer, initiative synchronous pulley, driven synchronous pulley and hold-in range, servo motor passes through the motor cabinet and sets up on the base, servo motor passes through the speed reducer and links to each other with initiative synchronous pulley, initiative synchronous pulley passes through the hold-in range and links to each other with driven synchronous pulley, the worm sets up on driven synchronous pulley, the worm wheel passes through the core axle sleeve setting at the dabber, and worm wheel and revolving stage main shaft fixed connection.

Further, the outer wall of the rotary table is provided with a plurality of layers of sheet clamping grooves, the locking block is provided with a plurality of layers of sheet clamping grooves, and the locking block is in staggered fit with the plurality of layers of sheet clamping grooves on the rotary table.

Further, a group of locking device is equipped with dust keeper between adjacent, dust keeper includes dustproof brush holder and dustproof brush, dustproof brush holder top surface is equipped with outer edge, be equipped with multilayer slice brush groove on the dustproof brush, multilayer slice brush groove and the dislocation cooperation of the multilayer slice draw-in groove of revolving stage main shaft outer wall.

Furthermore, the encoder is connected with the mandrel through the mandrel connecting flange, the encoder connecting flange, the needle roller thrust bearing and the mandrel sleeve, and the encoder rotates along with the main shaft of the turntable, so that the indexing accuracy is detected and fed back.

Furthermore, the bottom of the piston hole is externally connected with a hydraulic system oil way, and when the rotary indexing is carried out, hydraulic oil is communicated to enable the locking block to be loosened, namely, the hydraulic unlocking is carried out; when cutting operation is performed, hydraulic oil is discharged to lock the locking block, namely, the locking block is mechanically locked.

Further, the group of locking devices comprises 5 locking devices of upper left, lower left, middle, lower right and upper right, and the 5 locking devices are arranged in a sector shape with equal included angles.

The beneficial effects of the invention are as follows:

1) The locking function is realized by arranging a mechanical locking device and depending on the locking blocks and the multilayer sheet clamping grooves of the turntable; the locking power of the locking device is generated by compressing a plurality of groups of disc springs in a series, and the multi-layer sheet-shaped clamping groove structure enlarges the contact area between the locking block and the middle rotary table, thereby achieving the safe and reliable locking effect.

2) The mechanical locking device is arranged outside the upper end of the integral structure, visual locking and unlocking actions are clear at a glance, and the installation and the maintenance are more convenient.

3) The mechanical locking devices are arranged in a fan shape, so that the stress area is increased, and the stress is more balanced.

4) The numerical control rotary worktable mainly solves the problem that the mortise processing of the turbine disk with the outer diameter of phi 100-phi 150mm is performed, the positioning accuracy is within 0.015mm, the repeated positioning accuracy is within 0.010 mm, and the maximum 20 ton cutting force can be born.

Drawings

FIG. 1 is a schematic elevational view of the present invention;

FIG. 2 is a schematic top view of the present invention;

FIG. 3 is a schematic view of the internal structure of the mandrel according to the present invention;

FIG. 4 is a schematic view of a cross-section A-A of the present invention;

FIG. 5 is a schematic view of a B-B cross-sectional structure of the present invention;

FIG. 6 is a schematic view of an M-M cross-section structure according to the present invention;

FIG. 7 is a schematic view of a multi-layered card slot structure according to the present invention;

in the figure: 1. a base; 2. a turntable spindle; 3. a mandrel; 4. positioning a shaft head; 5. an encoder; 6. an encoder connecting flange; 7. the mandrel is connected with the flange; 8. a core sleeve; 9. a worm wheel; 10. needle roller thrust bearings; 11. a worm; 12. a multi-layer sheet card slot; 13. a piston; 14. a cylinder cover; 15. a belleville spring; 16. a locking bolt; 17. a pressing plate; 18. a locking block; 19. a servo motor; 20. a speed reducer; 21. a driving synchronous pulley; 22. a synchronous belt; 23. a driven synchronous pulley; 24. a locking device; 25. a dust-proof device; 26. a dustproof brush holder; 27. a dust-proof brush.

Detailed Description

The invention is further described below with reference to the drawings.

As shown in fig. 1 to 7, a small-sized numerical control indexing rotary table device has an overall shape of L-shape, and its total dimensions (including motor) are long x wide x high=521 mm x 285mm x 250mm; the common rotary table adopts an internal hydraulic locking mechanism, and the numerical control rotary table adopts an external mechanical locking mode; the 5 locking devices are arranged on the base in a fan-shaped mode, the worm and gear transmission mechanism is installed inside the base, and in order to achieve an external mechanical locking structure, the outer wall of the rotary table at the upper end of the main shaft is of a multi-layer sheet-shaped clamping groove structure. The visual locking and releasing actions of the device are clear at a glance, so that the device is more convenient to install and maintain; the mechanical locking mechanism ensures the reliability of the numerical control indexing turntable during machine tool machining operation and can bear broaching force of more than 20T and above.

The base 1 is provided with a mandrel 3, the base 1 is provided with a turntable main shaft 2 at the upper end of the mandrel 3, a shaft shoulder is arranged between the turntable main shaft 2 and the mandrel 3 through the mandrel 3, and the turntable main shaft 2 and the mandrel 3 are connected and fixed by using screws.

The outer wall of the turntable main shaft 2 is provided with a plurality of layers of sheet clamping grooves, the number of layers of the plurality of layers of sheet clamping grooves is set according to the cutting force required to bear during working, and 3 layers are arranged in the embodiment.

The middle part of the mandrel 3 is connected with a worm and gear transmission mechanism, and the indexing of the turntable main shaft 2 is driven by the worm and gear transmission mechanism; the worm and gear transmission mechanism adopts a single worm or double worm form. The worm and gear transmission mechanism comprises a worm 11, a worm wheel 9, a servo motor 19, a speed reducer 20, a driving synchronous pulley 21, a driven synchronous pulley 23 and a synchronous belt 22, wherein the servo motor 19 is arranged on the base 1 through a motor seat, the servo motor 19 is connected with the driving synchronous pulley 21 through the speed reducer 20, the driving synchronous pulley 21 is connected with the driven synchronous pulley 23 through the synchronous belt 22, the worm 11 is arranged on the driven synchronous pulley 23, the worm wheel 9 is arranged on the mandrel 3 through a mandrel sleeve, and the worm wheel 9 is fixedly connected with the bottom of the turntable spindle 2 through a screw.

When the turntable is in operation, the servo motor 19 is electrified to drive the speed reducer 20, the output shaft of the speed reducer 20 drives the driving synchronous pulley 21, the driving synchronous pulley 21 drives the driven synchronous pulley 23 to rotate through the synchronous belt 22, so that the worm 11 is driven, the worm 11 drives the worm wheel 9, and the mandrel 3 and the turntable main shaft 2 are driven to rotate. The turntable spindle 2 can be rotated clockwise or counterclockwise. The power source is a servo motor 19, so that the main shaft 2 of the turntable can be stopped at any angle position, and the aim of any indexing is fulfilled; the angle encoder 5 can make the indexing accurate and stable.

The encoder 5 is arranged at the lower end of the mandrel 3, the encoder 5 is connected with the mandrel 3 through the mandrel connecting flange 7, the encoder connecting flange 6, the needle roller thrust bearing 10 and the mandrel sleeve 8, and the encoder 5 rotates along with the turntable, so that the indexing accuracy is detected and fed back. In the implementation, the rotary table is provided with the full-closed-loop encoder on the dividing plate, and the measuring system with the distance coding reference point mark is used, so that a speed reducing switch is not required to be arranged on the dividing plate for returning to the reference point and a fixed reference point is returned, and the zeroing operation can be quickened and simplified in actual use.

A group of locking devices are arranged on the base 1 at the position close to the turntable main shaft 2, and are arranged around the base 1 in a fan shape, so that the turntable main shaft 2 can be axially and mechanically locked through the group of locking devices; in this embodiment, the set of locking devices includes 5 locking devices of upper left, lower left, middle, lower right, and upper right, and the 5 locking devices are arranged in a fan shape with equal included angles.

The locking device comprises a piston 13, a cylinder cover 14, a belleville spring 15, a locking bolt 16, a locking block 18 and a pressing plate 17, wherein the piston 13 and the belleville spring 15 are respectively arranged in a piston hole of the base 1, the piston 13 is positioned below the belleville spring 15, the cylinder cover 14 is arranged above the belleville spring 15, the belleville spring 15 is limited in the piston hole through the cylinder cover 14, the locking block 18 is arranged above the cylinder cover 14, the pressing plate 17 is arranged above the locking block 18, the locking bolt 16 penetrates through the pressing plate 17, the locking block 18 and the cylinder cover 14, the upper end of the locking bolt 16 is in limiting fit with the pressing plate 17, the lower end of the locking bolt is fixedly connected with the piston 13, and the belleville spring 15 is arranged between the piston 13 and the cylinder cover 14.

The bottom of the piston hole of the base 1 is externally connected with a hydraulic system oil way, and when the rotary indexing is carried out, hydraulic oil is communicated to enable the locking block to be loosened, namely the hydraulic unlocking is carried out; when cutting operation is performed, hydraulic oil is discharged to lock the locking block, namely, the locking block is mechanically locked. The method comprises the following steps: oil is drained from an oil way of the locking device, the cylinder cover 14 presses the disc spring 15 to be in a loosening state, the disc spring 15 is loosened to force the piston 13 to lean downwards to drive the pressing plate 17 to be pressed downwards through the locking bolt 16, the locking block 18 is arranged below the pressing plate 17, and one side of the locking block 18 is clamped into the base 1 to be positioned, so that the locking state is achieved; when the oil passage is filled with hydraulic oil, the belleville springs 15 expand to enable the piston 13 and the locking bolt 16 to be lifted upwards, and the axial mechanical locking device reaches a release state.

The locking block 18 is provided with a plurality of layers of sheet-shaped clamping grooves, and the locking block 18 is in staggered fit with the plurality of layers of sheet-shaped clamping grooves on the main shaft 2 of the turntable. The locking power of the locking device is generated by compressing a plurality of groups of disc springs in a series, and the multi-layer sheet clamping groove structure enlarges the contact area between the locking pressing block and the middle main shaft, thereby achieving the safe and reliable locking effect.

Because the locking devices are positioned outside the workbench and are easy to be contaminated by dust and chips, 1 set of dustproof devices 25 are arranged between the locking devices; the dustproof device 25 comprises a dustproof brush seat 26 and a dustproof brush 27, the top surface of the dustproof brush seat 26 is provided with an outer edge, the dustproof brush seat is covered on the position above the multilayer sheet-shaped clamping groove, the dustproof brush 27 is provided with a multilayer sheet-shaped brushing groove, and the multilayer sheet-shaped brushing groove is in dislocation fit with the multilayer sheet-shaped clamping groove on the outer wall of the turntable.

The invention can prevent the working table body from non-autonomous rotation under the action of cutting force. The turntable is in fan-shaped arrangement by 5 locking devices, and the locking pressing plate and the locking block are pulled downwards by the tension generated by the disc spring group to directly brake the workbench body; therefore, when the turntable works, the turntable is not electrified, the workbench is in a locking state, and if the turntable is to be indexed, the turntable is required to release the brake, and the locking is released by injecting pressure oil into the bottom of the piston.

The application of the numerical control indexing turntable on machine tools is very wide, such as a machining center, a numerical control lathe, a numerical control grinding machine, a numerical control milling machine and other general machine tools, but has essential differences from the application of the numerical control indexing turntable on a high-end broaching machine for broaching a wheel disc mortises, and the numerical control indexing turntable is mainly characterized in that: 1) The former belongs to light cutting (several kilograms to several tens of kilograms), and the latter belongs to heavy cutting (few tons, more than several tens of tons, and also bears impact load); 2) The former is stressed uniformly, the latter bears a single-side heavy cutting force (broaching force) which is extremely asymmetric, and the subversion moment is very large. The invention adopts a safe and reliable mechanical locking mechanism to ensure that the numerical control indexing turntable can bear the broaching force impact of more than 20T and more during the machining operation of a machine tool.

Claims

1. The utility model provides a small-size numerical control graduation revolving platform device, includes base (1), its characterized in that, be equipped with dabber (3) on base (1), be equipped with revolving stage main shaft (2) on base (1) in dabber (3) upper end, dabber (3) middle part is connected with worm gear, dabber (3) lower extreme is equipped with encoder (5), be equipped with a set of locking device on base (1) in the position that is close to revolving stage main shaft (2), and a set of locking device is fan-shaped around base (1), can realize carrying out axial mechanical locking to revolving stage main shaft (2) through a set of locking device;

the locking device comprises a piston (13), a cylinder cover (14), a disc spring (15), a locking bolt (16), a locking block (18) and a pressing plate (17), wherein the piston (13) and the disc spring (15) are respectively arranged in a piston hole of a base (1), the piston (13) is positioned below the disc spring (15), the cylinder cover (14) is arranged above the disc spring (15), the disc spring (15) is limited in the piston hole through the cylinder cover (14), the locking block (18) is arranged above the cylinder cover (14), the pressing plate (17) is arranged above the locking block (18), the locking bolt (16) penetrates through the pressing plate (17), the locking block (18) and the cylinder cover (14), the upper end of the locking bolt (16) is in limiting fit with the pressing plate (17), and the lower end of the locking bolt (16) is fixedly connected with the piston (13);

the outer wall of the turntable main shaft (2) is provided with a plurality of layers of sheet-shaped clamping grooves, the locking block (18) is provided with a plurality of layers of sheet-shaped clamping grooves, and the locking block (18) is in staggered fit with the plurality of layers of sheet-shaped clamping grooves on the turntable main shaft (2); a group of locking device is equipped with dust keeper (25) between adjacent, dust keeper (25) are including dustproof brush holder (26) and dustproof brush (27), dustproof brush holder (26) top surface is equipped with outer edge, be equipped with multilayer slice brush groove on dustproof brush (27), multilayer slice brush groove and the dislocation cooperation of the multilayer slice draw-in groove of revolving stage main shaft (2) outer wall.

2. The small numerical control indexing rotary table device according to claim 1, wherein the worm and gear transmission mechanism comprises a worm (11), a worm wheel (9), a servo motor (19), a speed reducer (20), a driving synchronous pulley (21), a driven synchronous pulley (23) and a synchronous belt (22), the servo motor (19) is arranged on the base (1) through a motor seat, the servo motor (19) is connected with the driving synchronous pulley (21) through the speed reducer (20), the driving synchronous pulley (21) is connected with the driven synchronous pulley (23) through the synchronous belt (22), the worm wheel (11) is arranged on the driven synchronous pulley (23), the worm wheel (9) is arranged on the mandrel (3) through a core shaft sleeve, and the worm wheel (9) is fixedly connected with the turntable spindle (2).

3. The small-sized numerical control indexing rotary table device according to claim 1, wherein the encoder (5) is connected with the mandrel (3) through the mandrel connecting flange (7), the encoder connecting flange (6), the needle roller thrust bearing (10) and the mandrel sleeve (8), and the encoder (5) rotates along with the main shaft of the rotary table, so that the indexing accuracy is detected and fed back.

4. The small-sized numerical control indexing rotary table device according to claim 1, wherein the bottom of the piston hole is externally connected with a hydraulic system oil circuit, and when the rotary indexing is performed, hydraulic oil is communicated to enable the locking block to be released, namely, the locking block is hydraulically unlocked; when cutting operation is performed, hydraulic oil is discharged to lock the locking block, namely, the locking block is mechanically locked.

5. The small-sized numerical control indexing table device according to claim 1, wherein the set of locking devices comprises 5 locking devices of upper left, lower left, middle, lower right and upper right, and the 5 locking devices are arranged in a sector shape with equal included angles.