AC shaft swing head

Abstract

The utility model discloses an AC shaft swing head which comprises a C shaft rotating mechanism, an A shaft rotating mechanism, a swing head base and a swing head main shaft, and the C shaft rotating mechanism comprises a first motor, a speed reducer and a C shaft brake assembly. The output end of the motor I is in transmission connection with the speed reducer, the output end of the speed reducer is connected with the C-axis brake assembly, a detachable connecting disc is arranged between the swing head base and the C-axis brake assembly, and the connecting disc is in power transmission connection with the swing head base and the C-axis brake assembly, so that the swing head base rotates around a C axis; the A-axis rotating mechanism is installed in the swing head base and comprises a second motor, a worm, a rotating tower, a time grating assembly and an A-axis brake assembly. The output end of the second motor is in transmission connection with a worm, the worm extends in the axial direction of the worm and is provided with spiral teeth, a plurality of rollers in meshing transmission with the spiral teeth are distributed in the circumferential direction of the rotating tower, one end of the rotating tower is connected with the time grating assembly and the A-axis brake assembly, the other end of the rotating tower is connected with the swing head main shaft, and the swing head main shaft rotates around the A axis.

Description

TECHNICAL FIELD

[0001] The utility model relates to numerical control machining center technical field, concretely relates to a AC axis swing head. BACKGROUND

[0002] The existing five-axis linkage numerical control machining center is based on the traditional three-axis X, Y, Z movement, and two angle coordinate movements are added, the A-axis rotates around the X-axis, and the C-axis rotates around the Z-axis. Under the control of the computer numerical control system, five-axis linkage can realize curved surface machining.

[0003] The C-axis mechanism of the existing AC axis swing head is driven by a direct drive motor, which has the advantages of fast running speed and no transmission mechanism, but also has the disadvantages of relatively small driving torque, generally only up to 400N-600N, and the C-axis mechanism and the swing head base adopt an integrated structure, which cannot be replaced in different machining environments and is not conducive to maintenance. In addition, the A-axis mechanism has the technical defects of complex structure, difficult installation and maintenance, large assembly cumulative error, low precision, and poor dynamic characteristics. SUMMARY

[0004] In view of the deficiencies of the prior art, the utility model provides an AC axis swing head applied to a multi-axis linkage numerical control machining center, which has compact structure and high dynamic characteristics and meets the machining requirements of complex parts.

[0005] To achieve the above purpose, the utility model realizes the following technical scheme:

[0006] An AC axis swing head, comprising a C-axis rotating mechanism, an A-axis rotating mechanism, a swing head base and a swing head spindle, the C-axis rotating mechanism comprising a motor one, a speed reducer and a C-axis brake assembly; the output end of the motor one is transmissionally connected with the speed reducer, and the output end of the speed reducer is connected with the C-axis brake assembly; a detachable connecting disc is arranged between the swing head base and the C-axis brake assembly, the connecting disc is connected with the swing head base and the C-axis brake assembly to realize the rotation of the swing head base around the C-axis.

[0007] The A-axis rotating mechanism is installed inside the swing head base, and the A-axis rotating mechanism comprises a motor two, a worm, a turret, a time gate assembly and an A-axis brake assembly; the output end of the motor two is transmissionally connected with the worm, the worm is provided with a spiral tooth in the axial direction, the turret is circumferentially distributed with a plurality of rollers which are in meshing transmission with the spiral tooth, one end of the turret is connected with the time gate assembly and the A-axis brake assembly, and the other end of the turret is connected with the swing head spindle to realize the rotation of the swing head spindle around the A-axis.

[0008] Further, the C-axis brake assembly comprises a C-axis flange, a C-axis brake disc, and a C-axis brake flange connected with the C-axis brake disc; the upper part of the C-axis flange is fixed with a speed reducer, and the lower part of the C-axis flange is provided with a cavity for accommodating the C-axis brake disc and the C-axis brake flange; the bottom of the C-axis brake flange is provided with a connecting disc, and the connecting disc is detachably connected with the C-axis brake flange through bolts.

[0009] Further, the top of the swing head base is provided with a connecting part one connected with the connecting disc, and the connecting part one is detachably connected with the connecting disc through bolts; the side of the swing head spindle is provided with a connecting part two connected with the turret, and the connecting part two is detachably connected with the turret through bolts; the connecting part one and the connecting part two are planar structures or stepped annular structures.

[0010] Further, the output end of the motor two is connected with an output gear, and the output gear is movably connected with a driven gear assembled with the worm input end through a synchronous belt.

[0011] Further, the turret comprises an integral structure of a shaft body and a disc convex body, the disc convex body is arranged outside the shaft body, the plurality of rollers are distributed in the circumferential direction of the disc convex body, and the swing head spindle is detachably connected with the shaft body of the turret through bolts.

[0012] Further, the time gate assembly comprises a time gate fixed seat and a time gate cover connected with the time gate fixed seat, the time gate fixed seat is externally sleeved with a time gate stator and a time gate rotor, and the rear end of the time gate fixed seat is connected with the shaft body of the turret.

[0013] Further, the A-axis brake assembly comprises a brake flange, a brake piston connected with the brake flange, and a brake pad cover sleeved outside the time gate fixed seat, the brake pad cover is provided with brake pads between the brake pad cover and the shaft body, the brake piston is circumferentially provided with a plurality of springs away from the brake flange, one end of each spring is abutted in a brake piston clamping groove, and the other end of each spring is abutted against an inner wall surface of the swing head base.

[0014] Further, the A-axis rotating mechanism further comprises a turntable assembly, the turntable assembly comprises a turntable bearing and a bearing cover, the turntable bearing is sleeved outside the shaft body and connected with the disc convex body, and the bearing cover is sleeved outside the shaft body and connected with the swing head base.

[0015] Further, a skeleton oil seal is arranged between the mating surfaces of the time gate fixed seat and the time gate cover, between the mating surfaces of the shaft body and the swing head base, and between the mating surfaces of the bearing cover and the shaft body.

[0016] Further, the sealing ring is arranged between the matching surface of the brake flange and the brake piston, between the matching surface of the brake flange and the swing base, between the matching surface of the brake piston and the swing base, and between the matching surface of the bearing cover and the swing base.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] An AC shaft swing head is provided, comprising a C-axis rotating mechanism, an A-axis rotating mechanism, a swing base and a swing spindle, a detachable connecting disc is designed between the swing base and the C-axis brake assembly, the connecting disc is connected with the swing base and the C-axis brake assembly to realize power transmission, so that the swing base rotates around the C-axis, the detachable connecting disc can be replaced according to actual processing requirements, so that swing bases of different sizes or different types can be replaced to meet the requirements of different processing environments, and maintenance is facilitated. The A-axis rotating mechanism integrates the motor two, the worm, the turret, the time grid assembly and the brake assembly in the swing base to form a compact axial layout. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 Fig. 1 is a perspective view of an AC shaft swing head;

[0020] Figure 2 Fig. 2 is a sectional view of the AC shaft swing head;

[0021] Figure 3 Fig. 3 is an exploded assembly view of the AC shaft swing head;

[0022] Figure 4 Fig. 4 is an exploded assembly view of the AC shaft swing head;

[0023] Figure 5 Fig. 5 is an exploded view of the A-axis rotating mechanism;

[0024] Figure 6 Fig. 6 is a connection structure diagram of the worm and the turret;

[0025] Figure 7 Fig. 7 is a front view of the AC shaft swing head.

[0026] In the figure: 1, C-axis rotating mechanism; 2, A-axis rotating mechanism; 3, swing head base; 4, swing head main shaft; 5, spring; 6, skeleton oil seal; 7, sealing ring; 11, motor one; 12, speed reducer; 13, C-axis flange; 14, C-axis brake disc; 15, C-axis brake flange; 16, connecting disc; 21, motor two; 22, worm; 23, turret; 24, time grid assembly; 25, A-axis brake assembly; 26, rotary table assembly; 211, output gear; 212, synchronous belt; 213, driven gear; 221, helical tooth; 231, roller; 232, shaft body; 233, disc convex body; 241, time grid fixed seat; 242, time grid fixed seat; 243, time grid stator; 244, time grid rotor; 251, brake flange; 252, brake piston; 253, brake pad cover; 254, brake pad; 261, rotary table bearing; 262, bearing cover. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] Referring to Figures 1-7 As shown in the figure, the utility model provides a kind of technical scheme: a kind of AC axis swing head, including C-axis rotating mechanism 1, A-axis rotating mechanism 2, swing head base 3 and swing head main shaft 4, C-axis rotating mechanism 1 includes motor one 11, speed reducer 12 and C-axis brake assembly;Motor one 11 output end transmission connection speed reducer 12, and the output end of speed reducer 12 is connected with C-axis brake assembly, and detachable connecting disc is arranged between swing head base 3 and C-axis brake assembly, and the connecting disc is connected with swing head base 3, C-axis brake assembly and forms power transmission, realizes swing head base 3 around C-axis rotation;By setting detachable connecting disc, different sizes or different models swing head base can be replaced according to actual processing needs, meet different processing environment to replace, and it is convenient to maintain simultaneously.

[0029] The A-axis rotating mechanism 2 is installed inside the swing head base 3, and the A-axis rotating mechanism 2 comprises a motor two 21, a worm 22, a turret 23, a time grid assembly 24 and an A-axis brake assembly 25; the output end of the motor two 21 is in transmission connection with the worm 22, the worm 22 is provided with a spiral tooth 221 extending along the axial direction thereof, the turret 23 is circumferentially distributed with a plurality of rollers 231 in meshing transmission with the spiral tooth 221, one end of the turret 23 is in connection with the time grid assembly 24 and the A-axis brake assembly 25, and the other end of the turret 23 is in connection with the swing head spindle 4 and realizes the rotation of the swing head spindle 4 around the A-axis. The A-axis rotating mechanism integrates the motor two 21, the worm 22, the turret 23, the time grid assembly 24 and the brake assembly 25 inside the swing head base 3, so as to form a compact axial layout. The meshing transmission structure of the worm 22 and the turret roller significantly improves the transmission rigidity and indexing accuracy of the A-axis rotation, and the worm 22 drives the turret roller to increase the reduction ratio and amplify the output torque; the time grid assembly 24 is coaxially installed with the turret 23, directly feeds back the rotation angle and eliminates the error of the intermediate transmission chain; the brake assembly 25 is coaxially arranged with the turret 23, shortens the braking response path and improves the reliability of braking.

[0030] Referring to Figures 2-3 As shown in the figure, the C-axis brake assembly comprises a C-axis flange 13, a C-axis brake disc 14 and a C-axis brake flange 15 in cooperation with the C-axis brake disc; the upper part of the C-axis flange 13 is fixed with the speed reducer 12, and the lower part of the C-axis flange 13 accommodates the C-axis brake disc 14 and the C-axis brake flange 15 in the inner cavity; the bottom of the C-axis brake flange 15 is provided with a connecting disc 16, and the connecting disc 16 is in detachable connection with the C-axis brake flange 15 through bolts. By setting the detachable connecting disc 16, different sizes or different types of swing head bases can be replaced according to actual processing needs, so as to meet the replacement in different processing environments, and facilitate maintenance.

[0031] Referring to Figures 2-3 As shown in the figure, the top of the swing head base 3 is provided with a connecting part one 31 in cooperation with the connecting disc 16, and the connecting part one 31 is in detachable connection with the connecting disc 16 through bolts; the side of the swing head base 3 is provided with a connecting part two 32 in cooperation with the turret 23, and the connecting part two 32 is in detachable connection with the turret 23 through bolts; the connecting part one 31 and the connecting part two 32 are in plane structure or stepped annular structure. By setting a plurality of circumferentially distributed bolts, the vibration amplitude of the base is reduced, the detachable connection shortens the replacement time of the base, and facilitates maintenance.

[0032] Referring to Figure 2 , Figure 5As shown, the output end of the motor two 21 is connected with an output gear 211, and the output gear 211 is movably connected with a driven gear 213 assembled with the input end of the worm 22 through a synchronous belt 212. The synchronous belt 212 is used to connect the motor two 21 and the worm 22, so as to form a flexible transmission buffer, disperse the transmission load through the gear-synchronous belt two-stage reduction structure, and reduce the instantaneous impact of the worm 22.

[0033] As shown in the drawings, Figures 5-6 As shown, the turret 23 comprises an integral structure of a shaft body 232 and a disc convex body 233, the disc convex body 233 is arranged outside the shaft body 232, a plurality of rollers 231 are distributed along the circumference of the disc convex body 233, and the swing head main shaft 4 is detachably connected with the shaft body 232 of the turret 23 through bolts. The turret 23 is integrally formed by the shaft body 232 and the disc convex body 233, so as to eliminate the assembly cumulative error of the traditional split type turret and ensure the shape and position tolerance of the installation surface of the roller 231.

[0034] As shown in the drawings, Figure 2 , Figure 5 As shown, the time gate assembly 24 comprises a time gate fixed seat 241 and a time gate cover 242 connected with the time gate fixed seat, a time gate stator 243 and a time gate rotor 244 are arranged outside the time gate fixed seat 241, and the rear end of the time gate fixed seat 241 is connected with the shaft body 232 of the turret 23.

[0035] As shown in the drawings, Figure 2 As shown, the A-axis brake assembly 25 comprises a brake flange 251, a brake piston 252 connected with the brake flange, and a brake pad pressing cover 253 arranged outside the time gate fixed seat 241, a brake pad 254 is arranged between the brake pad pressing cover 253 and the shaft body 232, a plurality of springs 5 are distributed along the circumference of the surface of the brake piston 252 away from the brake flange 251, one end of each spring 5 is abutted against the clamping groove of the brake piston 252, and the other end is abutted against the inner wall surface of the swing head base 3. The plurality of springs 5 are uniformly distributed along the circumference of the end surface of the brake piston 252 to form a ring-shaped elastic support system, so as to ensure that the pressing force of the brake pad pressing cover 253 on the brake pad 254 is uniformly distributed.

[0036] As shown in the drawings, Figure 2 , Figure 5 As shown, the A-axis rotating mechanism 2 further comprises a turntable assembly 26, the turntable assembly 26 comprises a turntable bearing 261 and a bearing cover 262, the turntable bearing 261 is arranged outside the shaft body 232 and connected with the disc convex body 233, and the bearing cover 262 is arranged outside the shaft body 232 and connected with the swing head base 3. The turntable bearing 261 effectively supports the turret 23 to keep it in a stable position, and the bearing cover 262 is tightly connected with the swing head base 3 to effectively prevent impurities such as dust and water vapor from invading the bearing lubrication area.

[0037] As shown in the drawings, Figure 2As shown, the skeleton oil seal 6 is arranged between the mating surface of the time grid fixed seat 241 and the time grid cover 242, between the mating surface of the shaft body 232 and the swing head base 3, and between the mating surface of the bearing cover 262 and the shaft body 232. By arranging the skeleton oil seal 6, a seal is formed between each component, the long-term reliability of the core components in harsh processing environments is ensured, the leakage of lubricating oil from the mating surface during the entire swing operation is prevented, and the intrusion of impurities such as dust and water is prevented, thereby prolonging the lubricant replacement cycle and the component maintenance cycle.

[0038] Referring to Figure 2 As shown, the sealing ring 7 is arranged between the mating surface of the brake flange 251 and the brake piston 252, between the mating surface of the brake flange 251 and the swing head base 3, between the mating surface of the brake piston 252 and the swing head base 3, and between the mating surface of the bearing cover 262 and the swing head base 3. By arranging the sealing ring 7, a seal is formed between each component, the long-term reliability of the core components in harsh processing environments is ensured, the leakage of lubricating oil from the mating surface during the entire swing operation is prevented, and the intrusion of impurities such as dust and water is prevented, thereby prolonging the lubricant replacement cycle and the component maintenance cycle.

[0039] Working principle: the C-axis rotating mechanism 1 outputs torque to the C-axis brake flange 15 through the motor 11 and the speed reducer 12, and power is transmitted to the connecting disc 16 to drive the swing head base 3 to rotate around the C-axis axis by ±360°. The A-axis rotating mechanism 2 outputs the output gear 211 through the motor 21, and the output gear 211 drives the worm 22 through the synchronous belt 212 and the driven gear 213, and the worm 22 drives the turret 23 engaged with it to rotate, and the worm 22 rotates one circle to drive the roller 231 on the turret 23 to rotate one position, and the turret 23 rotates to drive the swing head spindle 4, realizing the swing head spindle 4 rotating around the A-axis axis by ±110°.

Claims

1. An AC-axis oscillating head, comprising a C-axis rotation mechanism (1), an A-axis rotation mechanism (2), an oscillating head base (3), and an oscillating head main shaft (4), characterized in that, The C-axis rotation mechanism (1) includes a motor (11), a reducer (12), and a C-axis brake assembly; the output end of the motor (11) is connected to the reducer (12), the output end of the reducer (12) is connected to the C-axis brake assembly, and a detachable connecting plate is provided between the swing head base (3) and the C-axis brake assembly. The connecting plate forms a power transmission connection with the swing head base (3) and the C-axis brake assembly, so as to realize the rotation of the swing head base (3) around the C-axis. The A-axis rotation mechanism (2) is installed inside the swing head base (3). The A-axis rotation mechanism (2) includes a second motor (21), a worm (22), a turret (23), a time grid assembly (24), and an A-axis brake assembly (25). The output end of the second motor (21) is connected to the worm (22). The worm (22) is provided with helical teeth (221) extending along its axial direction. The turret (23) is circumferentially distributed with several rollers (231) that mesh with the helical teeth (221). One end of the turret (23) is connected to the time grid assembly (24) and the A-axis brake assembly (25). The other end of the turret (23) is connected to the swing head main shaft (4), thereby realizing the rotation of the swing head main shaft (4) around the A-axis.

2. The AC-axis oscillating head according to claim 1, characterized in that, The C-axis brake assembly includes a C-axis flange (13), a C-axis brake disc (14), and a C-axis brake flange (15) that is connected to the C-axis brake disc. The upper part of the C-axis flange (13) is fixed with a reducer (12), and the lower inner cavity accommodates the C-axis brake disc (14) and the C-axis brake flange (15). A connecting plate (16) is provided at the bottom of the C-axis brake flange (15), and the connecting plate (16) is detachably connected to the C-axis brake flange (15) by bolts.

3. The AC-axis oscillating head according to claim 1, characterized in that, The top of the swing head base (3) is provided with a connecting part one (31) that is connected to the connecting plate (16). The connecting part one (31) is detachably connected to the connecting plate (16) by bolts. The side of the swing head main shaft (4) is provided with a connecting part two (32) that is connected to the turret (23). The connecting part two (32) is detachably connected to the turret (23) by bolts. The connecting part one (31) and the connecting part two (32) are planar structures or stepped ring structures.

4. The AC-axis oscillating head according to claim 1, characterized in that, The output end of the second motor (21) is connected to an output gear (211), which is connected to the driven gear (213) assembled at the input end of the worm (22) via a synchronous belt (212) to form a motion transmission connection.

5. The AC-axis oscillating head according to claim 1, characterized in that: The turret (23) includes an integral shaft (232) and a disc protrusion (233). The disc protrusion (233) is located outside the shaft (232). The plurality of rollers (231) are distributed circumferentially along the disc protrusion (233). The swing head main shaft (4) is detachably connected to the shaft (232) of the turret (23) by bolts.

6. The AC-axis oscillating head according to claim 1, characterized in that, The time grating assembly (24) includes a time grating mounting base (241) and a time grating cover (242) that is connected to the time grating mounting base. The time grating mounting base (241) is externally fitted with a time grating stator (243) and a time grating mover (244). The rear end of the time grating mounting base (241) is connected to the shaft (232) of the turret (23).

7. The AC-axis oscillating head according to claim 1, characterized in that, The A-axis brake assembly (25) includes a brake piston (252) connected to a brake flange (251) and a brake pad cover (253) sleeved on the outside of the time grid fixing seat (241). A brake pad (254) is provided between the brake pad cover (253) and the shaft body (232). Several springs (5) are distributed around the surface of the brake piston (252) away from the brake flange (251). One end of each spring (5) abuts against the groove of the brake piston (252), and the other end abuts against the inner wall of the swing head base (3).

8. The AC-axis oscillating head according to claim 1, characterized in that, The A-axis rotation mechanism (2) further includes a turntable assembly (26), which includes a turntable bearing (261) and a bearing cover (262). The turntable bearing (261) is sleeved on the outside of the shaft body (232) and connected to the disc protrusion (233). The bearing cover (262) is sleeved on the outside of the shaft body (232) and connected to the swing head base (3).

9. The AC-axis oscillating head according to claim 6, characterized in that: A skeleton oil seal (6) is provided between the mating surfaces of the time grid fixing seat (241) and the time grid cover (242), between the mating surfaces of the shaft (232) and the swing head base (3), and between the mating surfaces of the bearing cover (262) and the shaft (232).

10. The AC-axis oscillating head according to claim 7, characterized in that: A sealing ring (7) is provided between the mating surfaces of the brake flange (251) and the brake piston (252), between the mating surfaces of the brake flange (251) and the sway head base (3), between the mating surfaces of the brake piston (252) and the sway head base (3), and between the mating surfaces of the bearing cover (262) and the sway head base (3).

Images