B-axis swing head

Abstract

The utility model discloses a B-axis swinging head which comprises a swinging head main shaft, a B-axis rotating mechanism and a swinging head base, the B-axis rotating mechanism is arranged in the swinging head base, and the B-axis rotating mechanism comprises a driving motor, a worm, a rotating tower, a time grating assembly and a brake assembly. The output end of the driving motor is in transmission connection with the 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, the time grating assembly and the brake assembly are coaxially connected to one end of the rotating tower, and the swing head main shaft is coaxially connected to the other end of the rotating tower and rotates around a shaft B through the rotating tower. A compact axial layout is formed by integrating the driving motor, the worm, the rotating tower, the time grating assembly and the brake assembly in the swinging head base. The meshing transmission structure of the worm and the turret roller obviously improves the transmission rigidity and the indexing precision of the rotation of the B shaft. The B-axis swing head is high in overall structure space utilization rate and suitable for being used in a multi-axis linkage machining center.

Description

TECHNICAL FIELD

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

[0002] The B axis swing head for numerical control machining center is a kind of common high-end numerical control machine tool accessory, and can constitute a multi-axis linkage machining center by cooperating with rotary table.

[0003] The driving mode of the B axis swing head on the market at present is mainly mechanical, and most of them adopt synchronous pulley set transmission, harmonic reducer speed reduction output, its structure is complex, installation, maintenance are difficult, assembly cumulative error is big, precision is low, dynamic characteristic is poor and other technical defects. UTILITY MODEL CONTENTS

[0004] In view of the deficiencies of prior art, the utility model provides a B axis swing head applied to multi-axis linkage machining center, which is compact in structure and high in dynamic characteristic, and meets the processing needs of complex parts.

[0005] To achieve the above object, the utility model is realized by the following technical scheme:

[0006] A B axis swing head, including swing head spindle, B axis rotating mechanism, swing head base, the swing head base is internally provided with B axis rotating mechanism, the B axis rotating mechanism includes drive motor, worm, turret, time gate assembly and brake assembly;The drive motor output end transmission connects worm, the worm is provided with helical tooth along its axial extension, the turret is peripherally distributed with a plurality of rollers engaged transmission with helical tooth, the time gate assembly, brake assembly are coaxially connected to one end of turret, the swing head spindle is coaxially connected to the other end of turret, and rotation around B axis is realized by turret.

[0007] Further, the drive motor output end is coaxially connected with output gear, and the output gear forms motion transmission connection with driven gear assembled with worm input end through synchronous belt.

[0008] Further, the turret includes the shaft body and the disc convex body of integrated structure, the disc convex body is arranged outside the shaft body, the plurality of rollers are peripherally distributed along the disc convex body, and the swing head spindle is detachably connected with the shaft body of turret by bolt.

[0009] Further, the time gate assembly includes time gate fixed seat and time gate cover connected with time gate fixed seat, the time gate fixed seat is externally sleeved with time gate stator and time gate mover, and the rear end of time gate fixed seat is connected with the shaft body of turret.

[0010] Further, the brake assembly comprises a brake flange, a brake piston connected with the brake flange, and a brake pad cover arranged outside the time grid fixed seat, wherein the brake pad cover is arranged between the brake pad and the shaft body, the brake piston is provided with a plurality of springs distributed around the circumference of the surface away from the brake flange, and one end of each spring is abutted against the brake piston clamping groove, and the other end is abutted against the inner wall surface of the swing head base.

[0011] Further, the B-axis rotating mechanism further comprises a rotary table assembly, wherein the rotary table assembly comprises a rotary table bearing and a bearing cover, the rotary table bearing is arranged outside the shaft body and connected with the disc convex body, and the bearing cover is arranged outside the shaft body and connected with the swing head base.

[0012] Further, the cooperating surfaces between the time grid fixed seat and the time grid cover, the cooperating surfaces between the shaft body and the swing head base, and the cooperating surfaces between the bearing cover and the shaft body are all provided with a skeleton oil seal.

[0013] Further, the cooperating surfaces between the brake flange and the brake piston, the cooperating surfaces between the brake flange and the swing head base, the cooperating surfaces between the brake piston and the swing head base, and the cooperating surfaces between the bearing cover and the swing head base are all provided with a sealing ring.

[0014] Further, the swing head spindle is provided with a connecting surface connected with the turret, the connecting surface is a planar structure or a stepped annular structure, and the connecting surface is detachably connected with the turret through bolts.

[0015] Compared with the prior art, the B-axis swing head has the following beneficial effects:

[0016] The B-axis swing head is provided by integrating the driving motor, the worm, the turret, the time grid assembly and the brake assembly inside the swing head base, so that a compact axial layout is formed. The meshing transmission structure of the worm and the turret roller significantly improves the transmission rigidity and indexing accuracy of the B-axis rotation, the worm drives the turret roller to increase the reduction ratio and amplify the output torque, the time grid assembly is coaxially installed with the turret, directly feeds back the rotation angle and eliminates the error of the intermediate transmission chain, and the brake assembly is coaxially arranged with the turret, shortens the braking response path and improves the reliability of braking. The B-axis swing head has high space utilization rate of the overall structure and is suitable for multi-axis linkage machining centers. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 Fig. 1 is a general assembly structure diagram of the B-axis swing head;

[0018] Figure 2 Fig. 2 is an exploded structure diagram of the B-axis swing head;

[0019] Figure 3 Fig. 3 is a connection structure diagram of the worm and the turret;

[0020] Figure 4 B-axis swing head cross-sectional structure diagram is shown as follows:

[0021] Figure 5 B-axis swing head cross-sectional structure diagram is shown as follows:

[0022] Figure 6 B-axis swing head main view structure diagram is shown as follows.

[0023] In the figure: 1, swing head main shaft; 2, B-axis rotating mechanism; 3, swing head base; 4, skeleton oil seal; 5, sealing ring; 6, spring; 21, driving motor; 22, worm; 23, turret; 24, time grid assembly; 25, 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

[0024] 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.

[0025] Reference Figures 1-6The utility model provides a kind of B axis swing head, including swing head main shaft 1, B axis rotating mechanism 2, swing head pedestal 3, swing head pedestal 3 inside is provided with B axis rotating mechanism 2, B axis rotating mechanism 2 includes drive motor 21, worm 22, turret 23, time grid assembly 24 and brake assembly 25;Drive motor 21 output end transmission connection worm 22, worm 22 is provided with helical tooth 221 along its axial extension, and turret 23 is distributed with several rollers 231 meshing transmission with helical tooth 221, time grid assembly 24, brake assembly 25 are coaxially connected in one end of turret 23, swing head main shaft 1 is coaxially connected in the other end of turret 23, and it is realized around B axis rotation by turret 23.By drive motor 21, worm 22, turret 23, time grid assembly 24 and brake assembly 25 are integrated in swing head pedestal 3 inside, form compact axial layout.Worm 22 and the meshing transmission structure of turret roller significantly improve the transmission rigidity and indexing accuracy of B axis rotation, and worm 22 drives turret roller to increase the reduction ratio and amplify output torque;Time grid assembly 24 is coaxially installed with turret 23, directly feedback rotation angle, eliminates intermediate transmission chain error;Brake assembly 25 is coaxially arranged with turret 23, shortens brake response path, improves the reliability of braking.B axis swing head overall structural space utilization is high, is suitable for high-precision multi-axis linkage machining demand.

[0026] Referring to Figure 2 、 Figure 5 , drive motor 21 output end is coaxially connected with output gear 211, and output gear 211 is formed motion transmission connection by synchronous belt 212 with the input end of worm 22 driven gear 213 assembly.Adopt synchronous belt 212 to connect drive motor 21 and worm 22, form flexible transmission buffer, and the transmission load is dispersed by gear-synchronous belt two-stage reduction structure, and worm 22 instantaneous impact is reduced.

[0027] Referring to Figure 3 , turret 23 includes the shaft body 232 of integrated structure and disc convex body 233, disc convex body 233 is located at the outside of shaft body 232, and several rollers 231 are distributed along the circumference of disc convex body 233, and swing head main shaft 1 is provided with the connecting surface matched with turret 23, and the connecting surface is plane structure or stepped annular structure, and the detachable connection is formed by bolt and turret 23.Turret 23 is formed by the integrated molding process of shaft body 232 and disc convex body 233, eliminates the assembly cumulative error of traditional split type turret, and guarantees the form tolerance of roller 231 installation surface.

[0028] Referring to Figure 4 , time grid assembly 24 includes time grid fixed seat 241 and time grid cover 242 matched with time grid fixed seat, time grid fixed seat 241 is externally sleeved with time grid stator 243 and time grid rotor 244, and the rear end of time grid fixed seat 241 is rigidly connected with the shaft body 232 of turret 23 by bolt.

[0029] Referring to Figure 4 , the brake assembly 25 includes a brake flange 251 and a brake piston 252 connected with the brake flange, and a brake pad cover 253 sleeved outside the time grid fixed seat 241, the brake pad cover 253 and the shaft body 232 are provided with brake pads 254, the brake piston 252 away from the brake flange 251 is circumferentially distributed with a plurality of springs 6, one end of the plurality of springs 6 abuts in the brake piston 252 clamping groove, and the other end abuts the inner wall surface of the swing head base 3. The plurality of springs 6 are uniformly distributed along the end surface of the brake piston 252 to form a ring-shaped elastic support system, ensuring that the brake pad cover 253 uniformly distributes the pressing force on the brake pads 254.

[0030] Referring to Figure 2 , Figure 4 , the B-axis rotating mechanism 2 further includes a rotary table assembly 26, the rotary table assembly 26 includes a rotary table bearing 261 and a bearing cover 262, the rotary table bearing 261 is sleeved outside the shaft body 232 and connected with the disc convex body 233, and the bearing cover 262 is sleeved outside the shaft body 232 and connected with the swing head base 3. The rotary table bearing 261 effectively supports the rotating tower 23 to keep it in a stable position, and the bearing cover 262 is tightly connected with the swing head base 3, effectively preventing dust, water vapor and other impurities from invading the bearing lubrication area.

[0031] Referring to Figure 4 , the cooperating surfaces between the time grid fixed seat 241 and the time grid cover 242, the cooperating surfaces between the shaft body 232 and the swing head base 3, and the cooperating surfaces between the bearing cover 262 and the shaft body 232 are all provided with a skeleton oil seal 4. By providing the skeleton oil seal 4, a seal is formed between each component, ensuring the long-term reliability of the core components in harsh machining environments, preventing lubricating oil from leaking from the cooperating surfaces during the entire swing operation, and preventing dust, water vapor and other impurities from invading, thereby prolonging the lubricant replacement cycle and the component maintenance cycle.

[0032] Referring to Figure 4 , the cooperating surfaces between the brake flange 251 and the brake piston 252, the cooperating surfaces between the brake flange 251 and the swing head base 3, the cooperating surfaces between the brake piston 252 and the swing head base 3, and the cooperating surfaces between the bearing cover 262 and the swing head base 3 are all provided with a sealing ring 5. By providing the sealing ring 5, a seal is formed between each component, ensuring the long-term reliability of the core components in harsh machining environments, preventing lubricating oil from leaking from the cooperating surfaces during the entire swing operation, and preventing dust, water vapor and other impurities from invading, thereby prolonging the lubricant replacement cycle and the component maintenance cycle.

[0033] Working principle: the output end of the driving motor 21 drives the output gear 211, the output gear 211 drives the driven gear 213 through the synchronous belt 212, the driven gear 213 drives the worm 22 to rotate, the worm 22 drives the turret 23 engaged with it to rotate, the worm 22 rotates one circle to drive the roller 231 on the turret 23 to rotate one bit, the turret 23 rotates to drive the swing head main shaft 1, and the swing head main shaft 1 rotates around the B-axis axis by ±110° angle.

Claims

1. A B-axis swing head, comprising a swing head spindle (1), a B-axis rotation mechanism (2), a swing head base (3), characterized in that, The swing head base (3) is internally provided with a B-axis rotating mechanism (2), the B-axis rotating mechanism (2) comprises a driving motor (21), a worm (22), a turret (23), a time gate assembly (24) and a brake assembly (25); the driving motor (21) is transmissionally connected with the worm (22) at the output end, the worm (22) is provided with a helical tooth (221) extending along the axial direction, the turret (23) is circumferentially provided with a plurality of rollers (231) which are in meshing transmission with the helical tooth (221), the time gate assembly (24) and the brake assembly (25) are coaxially connected to one end of the turret (23), the swing head spindle (1) is coaxially connected to the other end of the turret (23) and rotates around the B-axis through the turret (23).

2. The B-axle swing head of claim 1, wherein, The driving motor (21) is coaxially connected with an output gear (211) at the output end, the output gear (211) is in motion transmission connection with a driven gear (213) assembled with the worm (22) at the input end through a synchronous belt (212).

3. The B-axle swing head of claim 1, wherein, 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), the plurality of rollers (231) are circumferentially distributed along the disc convex body (233), and the swing head spindle (1) is detachably connected with the shaft body (232) of the turret (23) through bolts.

4. The B-axle swing head of claim 1, wherein, The time gate assembly (24) comprises a time gate fixed seat (241) and a time gate cover (242) which is in matched connection with the time gate fixed seat, the time gate fixed seat (241) is externally sleeved with a time gate stator (243) and a time gate rotor (244), and the rear end of the time gate fixed seat (241) is connected with the shaft body (232) of the turret (23).

5. The B-axle swing head of claim 4, wherein, The brake assembly (25) comprises a brake flange (251), a brake piston (252) which is in matched connection with the brake flange, and a brake pad pressing cover (253) which is sleeved 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 (6) are circumferentially distributed on the surface of the brake piston (252) away from the brake flange (251), one end of the plurality of springs (6) is abutted in 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).

6. The B-axle swing head of claim 5, wherein, The B-axis rotating mechanism (2) further comprises a rotary table assembly (26), the rotary table assembly (26) comprises a rotary table bearing (261) and a bearing cover (262), the rotary table bearing (261) is sleeved outside the shaft body (232) and connected with the disc convex body (233), and the bearing cover (262) is sleeved outside the shaft body (232) and connected with the swing head base (3).

7. The B-axle swing head of claim 5, wherein, A skeleton oil seal (4) is arranged between the matched surfaces of the time gate fixed seat (241) and the time gate cover (242), between the matched surfaces of the shaft body (232) and the swing head base (3), and between the matched surfaces of the bearing cover (262) and the shaft body (232).

8. The B-axle swing head of claim 6, wherein, The sealing ring (5) is arranged between the matching surface of the brake flange (251) and the brake piston (252), between the matching surface of the brake flange (251) and the swing base (3), between the matching surface of the brake piston (252) and the swing base (3), and between the matching surface of the bearing cover (262) and the swing base (3).

9. The B-axle swing head of claim 1, wherein, The swing head spindle (1) is provided with a connecting surface matched and connected with the turret (23), and the connecting surface is a planar structure or a stepped annular structure, and the detachable connection is formed by bolts and the turret (23).

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