CN115302263A

CN115302263A - Small-size numerical control indexing revolving platform device

Info

Publication number: CN115302263A
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: 2022-11-08
Anticipated expiration: 2042-09-06
Also published as: CN115302263B

Abstract

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

Description

Small-size numerical control indexing revolving platform device

Technical Field

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

Background

The production research and development of basic parts are various key core basic parts in most enterprises in the equipment manufacturing industry of China, particularly in the national equipment of 'neck', and foreign supplier enterprises start to take restrictions on China in various aspects such as part supply, price, supply period, specification and the like. Therefore, the situation that key and core parts depend on import and are restricted by people for a long time is solved as soon as possible, and the common problem of equipment manufacturing enterprises is solved.

A small-sized high-load precision numerical control indexing turntable is a core component of high-efficiency precision machining broaching equipment for a wheel disc mortise, and the wheel disc mortise broaching equipment is processing equipment at the top of national defense industry, and is high-end equipment of a neck which is mainly researched and developed by national key support. The small-sized high-load-precision numerical control indexing turntable has the outer diameter of only 94mm, can process wheel disc mortises with the outer diameters of phi 100mm to phi 200mm, and can bear 20 tons of broaching force. The special numerical control indexing table is developed in China and is a blank in the numerical control indexing table, and completely depends on foreign import.

The small-sized high-load precision indexing turntable mainly has three characteristics: 1) The accurate and reliable indexing precision, the positioning precision and the repeated positioning precision are high (10 ', and the repeated positioning precision is 6'); 2) The bearing capacity is strong, the broaching force of more than 20T and the impact force in the broaching state can be borne, and the cutting force acts on the edge of the rotary table; 3) The mode of mechanical locking of the belleville spring is a normally closed mode, and only when the rotary lock rotates in an indexing way, the rotary lock can be unlocked and loosened, so that the rotary lock is safe and reliable.

In the broaching process of the wheel disc mortise broaching equipment, because the shapes of the wheel disc mortises are different (the main three forms of the wheel disc mortises are fir-tree shapes, gourd shapes and dovetail shapes), the quantity is different, and different specifications of the wheel disc are accurately positioned and indexed by an indexing turntable so as to ensure the accurate processing of the mortise processing process. In addition, the wheel disc is mainly made of titanium alloy, stainless steel and high-temperature alloy, the materials are difficult to machine and expensive, the material cost of each wheel disc is hundreds of thousands of millions, the machining of the mortise of the wheel disc is accurate and effective every time, and the problem that the workpiece is damaged in the links of indexing and locking of the rotary table is avoided. Therefore, the requirements on the numerical control indexing rotary table are very strict, namely ultrahigh precision indexing and positioning are required, and meanwhile, the rotary table can be ensured not to generate angle displacement, flatness and concentricity errors in the precision machining process.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a small numerical control indexing rotary table device which is small in integral structure, compact in layout, safe and reliable.

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 lieing in the dabber upper end, the dabber middle part is connected with worm gear drive mechanism, the dabber lower extreme is equipped with the encoder, be equipped with a set of locking device near revolving stage main shaft position on the base, and a set of locking device is fan-shaped and arranges 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, locking 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 belleville spring top, and is spacing with belleville spring in the piston hole through the cylinder cap, the cylinder cap top is equipped with the latch segment, the latch segment top is equipped with the clamp plate, locking bolt wears to locate clamp plate, latch segment and cylinder cap, and the spacing cooperation of locking bolt upper end and clamp plate, and the lower extreme links to each other with the piston is fixed, and belleville spring sets up between piston and cylinder cap.

Further, worm gear 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 dabber cover and sets up at the spindle, and worm wheel and revolving stage main shaft fixed connection.

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

Furthermore, a set of locking device is equipped with dust keeper between adjacent, dust keeper includes dustproof brush seat and dustproof brush, dustproof brush seat 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 of the multilayer slice draw-in groove of revolving stage main shaft outer wall are cooperated.

Furthermore, the encoder is connected with the mandrel through a mandrel connecting flange, an encoder connecting flange, a needle roller thrust bearing and a mandrel sleeve, and rotates along with the rotary table spindle, so that the indexing precision is detected and fed back.

Furthermore, the bottom of the piston hole is externally connected with a hydraulic system oil way, and when the piston hole is rotationally indexed, hydraulic oil is introduced to loosen the locking block, namely, the piston hole is hydraulically unlocked; when cutting operation is carried out, the hydraulic oil is discharged to enable the locking block to be locked, namely, the locking block is mechanically locked.

Furthermore, a set of locking device includes upper left, lower left, middle, lower right, upper right 5 locking devices, and 5 locking devices are arranged by fan-shaped equal included angle.

The invention has the following beneficial effects:

1) By arranging a mechanical locking device, the locking function is realized by a locking block and a plurality of layers of sheet-shaped clamping grooves of the rotary table; the locking power of the locking device is generated by compressing a plurality of groups of disc springs in series, and the contact area of the locking block and the middle rotary table is enlarged due to the multilayer sheet clamping groove structure, so that the safe and reliable locking effect is achieved.

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 installation and 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 problems that the mortise machining of a turbine disc with the outer diameter of phi 100-phi 150mm is performed, the positioning precision is within 0.015mm, the repeated positioning precision is within 0.010, and the numerical control rotary worktable can bear 20 tons of cutting force to the maximum extent.

Drawings

FIG. 1 is a schematic front 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 of the present invention;

FIG. 4 isbase:Sub>A schematic view of the cross-sectional structure A-A of the present invention;

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

FIG. 6 is a schematic view of the M-M cross-sectional structure of the present invention;

FIG. 7 is a schematic view of a multi-layer sheet card slot configuration of 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. the encoder is connected with a flange; 7. the core shaft is connected with a flange; 8. a core sleeve; 9. a worm gear; 10. a needle roller thrust bearing; 11. a worm; 12. a plurality of layers of sheet-shaped slots; 13. a piston; 14. a cylinder cover; 15. a disc spring; 16. locking the bolt; 17. pressing a 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 timing pulley; 24. a locking device; 25. a dust-proof device; 26. a dust-proof brush holder; 27. a dust-proof brush.

Detailed Description

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

As shown in fig. 1 to 7, a small numerical control indexing turret device has an L-shaped overall shape, and has overall dimensions (including motors) of length × width × height =521mm × 285mm × 250mm; the common rotary table adopts an internal hydraulic locking mechanism, and the numerical control rotary table adopts an external mechanical locking mode; 5 locking device are fan-shaped and arrange and set up on the base, and worm gear drive mechanism installs inside the base, for realizing outside mechanical type locking structure, main shaft upper end revolving stage outer wall is multilayer slice draw-in groove structure. The visual locking and unlocking 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 the machining operation of the machine tool and can bear the broaching force of more than 20T and above.

Be equipped with dabber 3 on the base 1, be equipped with revolving stage main shaft 2 on the base 1 lieing in dabber 3 upper end, through setting up the shaft shoulder on dabber 3 between revolving stage main shaft 2 and the dabber 3, utilize the screw will carry out to be connected fixedly between revolving stage main shaft 2 and the dabber 3.

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

The middle part of the mandrel 3 is connected with a worm gear transmission mechanism, and the worm gear transmission mechanism drives the indexing of the turntable spindle 2; the worm and gear transmission mechanism adopts a single worm or double worm mode. Worm gear drive mechanism includes worm 11, worm wheel 9, servo motor 19, speed reducer 20, initiative synchronous pulley 21, driven synchronous pulley 23 and hold-in range 22, servo motor 19 passes through the motor cabinet setting on base 1, servo motor 19 passes through speed reducer 20 and links to each other with initiative synchronous pulley 21, initiative synchronous pulley 21 passes through hold-in range 22 and links to each other with driven synchronous pulley 23, worm 11 sets up on driven synchronous pulley 23, worm wheel 9 passes through the dabber cover and sets up on dabber 3, and worm wheel 9 passes through screw fixed connection with 2 bottoms of revolving stage main shaft.

When the automatic transmission device works, the servo motor 19 is electrified to drive the speed reducer 20, the output shaft of the speed reducer 20 drives the driving synchronous belt pulley 21, the driving synchronous belt pulley 21 drives the driven synchronous belt 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 spindle 2 are driven to rotate. The turntable spindle 2 can rotate either clockwise or counterclockwise. The power source is a servo motor 19, so that the rotary table spindle 2 can stop at any angle position to achieve the purpose of any indexing; the angular 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 a mandrel connecting flange 7, an encoder connecting flange 6, a needle roller thrust bearing 10 and a mandrel sleeve 8, and the encoder 5 rotates along with the rotary table, so that the indexing precision is detected and fed back. In the implementation, the full closed-loop encoder is arranged on the dividing plate of the rotary table, and a measuring system with a distance encoding reference point mark is used, so that a speed reduction switch is not required to be arranged on the dividing plate for returning to a reference point, and a fixed reference point is returned, so that the zero returning operation can be accelerated and simplified in practical use.

A group of locking devices are arranged on the base 1 at positions close to the turntable spindle 2, the group of locking devices are arranged around the base 1 in a fan shape, and the turntable spindle 2 can be axially and mechanically locked through the group of locking devices; in this embodiment, a set of locking device includes upper left, lower left, middle, lower right, upper right 5 locking devices, and 5 locking devices are arranged by fan-shaped equal included angle.

Locking device includes piston 13, cylinder cap 14, belleville spring 15, locking bolt 16, latch segment 18 and clamp plate 17, piston 13 and belleville spring 15 set up respectively in the piston hole of base 1, and piston 13 is located belleville spring 15 below position, cylinder cap 14 sets up in belleville spring 15 top, it is spacing in the piston hole with belleville spring 15 through cylinder cap 14, cylinder cap 14 top is equipped with latch segment 18, latch segment 18 top is equipped with clamp plate 17, locking bolt 16 wears to locate clamp plate 17, latch segment 18 and cylinder cap 14, and the spacing cooperation of locking bolt 16 upper end and clamp plate 17, the lower extreme links to each other with piston 13 is fixed, belleville spring 15 sets up between piston 13 and cylinder cap 14.

The bottom of a piston hole of the base 1 is externally connected with a hydraulic system oil way, and when the base is rotated and indexed, hydraulic oil is introduced to loosen the locking block, namely, the base is unlocked hydraulically; when cutting operation is carried out, the hydraulic oil is discharged to enable the locking block to be locked, namely, the locking block is mechanically locked. The method specifically comprises the following steps: oil is drained from an oil path of the locking device, a cylinder cover 14 presses a disc spring 15 to be in a loose state, the disc spring 15 loosens to force a piston 13 to lean against a pressing plate 17 to be pressed downwards through a locking bolt 16, a locking block 18 is arranged below the pressing plate 17, and the locking block 18 is clamped into the base 1 to be positioned at one side to achieve a locking state; when the oil path is communicated with hydraulic oil, the disc-shaped spring 15 expands tightly, so that the piston 13 and the locking bolt 16 are lifted upwards, and the axial mechanical locking device reaches a loosening 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 rotary table spindle 2. The locking power of the locking device is generated by the compression of a plurality of groups of disc springs in series, and the contact area between the locking pressing block and the middle main shaft is enlarged by the multilayer sheet clamping groove structure, so that the safe and reliable locking effect is achieved.

As the locking devices are positioned outside the workbench and are easily polluted by dust and cutting scraps, 1 set of dustproof device 25 is arranged between the locking devices; dustproof device 25 includes dustproof brush seat 26 and dustproof brush 27, dustproof brush seat 26 top surface is equipped with outer edge, covers in multilayer slice draw-in groove top position, is equipped with multilayer slice brush groove on the dustproof brush 27, multilayer slice brush groove and the multilayer slice draw-in groove dislocation fit of revolving stage outer wall.

The invention can prevent the workbench body from rotating autonomously under the action of cutting force. The turntable is arranged in a fan shape by 5 locking devices, and the locking pressure plate and the locking block are pulled downwards by the pulling force generated by the disc-shaped spring group to directly brake the worktable body; therefore, when the rotary table works, the power is not supplied, the working table is in a locking state, and if the rotary table needs to be unlocked for indexing, the pressure oil is injected into the bottom of the piston to unlock the locking.

The application of the numerical control indexing turntable on a machine tool is very wide, for example, the numerical control indexing turntable is adopted on general machine tools such as a machining center, a numerical control lathe, a numerical control grinding machine, a numerical control milling machine and the like, but the application of the numerical control indexing turntable on a high-end broaching machine for broaching the mortise of the wheel disc has essential difference, and is mainly embodied as follows: 1) In contrast, the former belongs to light cutting (several kilograms to tens of kilograms), and the latter belongs to heavy cutting (few tons, more dozens of tons, and still bears impact load); 2) The former is stressed uniformly, the latter bears asymmetric unilateral heavy cutting force (broaching force), and the overturning 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 impact of the broaching force of more than 20T and above during the machining operation of the 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 lieing in dabber (3) on base (1), dabber (3) middle part is connected with worm gear drive mechanism, dabber (3) lower extreme is equipped with encoder (5), be equipped with a set of locking device being close to revolving stage main shaft (2) position on base (1), and a set of locking device is fan-shaped and arranges around base (1), can realize carrying out axial mechanical locking to revolving stage main shaft (2) through a set of locking device.

2. The small-sized numerical control indexing rotary table device according to claim 1, wherein 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 pressure plate (17), the piston (13) and the disc spring (15) are respectively arranged in a piston hole of the base (1), the piston (13) is located 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 pressure plate (17) is arranged above the locking block (18), the locking bolt (16) penetrates through the pressure plate (17), the locking block (18) and the cylinder cover (14), the upper end of the locking bolt (16) is in limit fit with the pressure plate (17), and the lower end of the locking bolt is fixedly connected with the piston (13).

3. The small-sized numerical control indexing turntable 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 base, 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 turntable spindle (2).

4. The small-sized numerical control indexing rotary table device according to claim 1, wherein the outer wall of the rotary table 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 rotary table main shaft (2).

5. The small-sized numerical control indexing rotary table device according to claim 1, wherein a dustproof device (25) is arranged between adjacent locking devices, the dustproof device (25) comprises a dustproof brush seat (26) and a dustproof brush (27), an outer edge is arranged on the top surface of the dustproof brush seat (26), a multilayer sheet-shaped brush groove is formed in the dustproof brush (27), and the multilayer sheet-shaped brush groove is in staggered fit with the multilayer sheet-shaped clamping groove in the outer wall of the rotary table spindle (2).

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

7. 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 carried out, hydraulic oil is introduced to loosen the locking block, namely, the locking block is hydraulically unlocked; when cutting operation is carried out, the hydraulic oil is discharged to enable the locking block to be locked, namely, the locking block is mechanically locked.

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