A non-orthogonal DD rotary table arranged obliquely

Abstract

The utility model discloses a kind of oblique non-orthogonal DD rotary workbench, it relates to numerical control machine tool technical field, including rotating shaft and tilt axis, the rotating center of the rotating shaft with the tilt axis is 45 ° non-orthogonal arrangement, the rotating shaft is locked on the tilt axis by adapter ring;The utility model breaks through the restriction of rotating shaft to workpiece size in traditional orthogonal layout by non-orthogonal structure design, effectively expands processing space, so that equipment can accommodate and process larger specification workpiece, satisfy the processing demand of large parts.

Description

Technical Field

[0001] This utility model relates to the field of CNC machine tool technology, specifically to an inclined non-orthogonal DD rotary table. Background Technology

[0002] The existing DD five-axis rotary table usually consists of a tilt axis, a rotary axis, and a tailstock. The rotation center of the rotary axis is perpendicular (or orthogonal) to the rotation centers of the tilt axis and the tailstock, which is called a cradle-type five-axis.

[0003] However, the existing DD five-axis rotary table still has some drawbacks in actual use: the rotary axis limits the size of the workpiece that can be processed, the interference range is large when rotating, the overall size of the equipment is long, the large moment of inertia leads to slow dynamic response, and the disc brake structure is large in size under the same braking torque, which makes it difficult to meet the processing requirements of high precision and large-size workpieces.

[0004] To address these issues, we designed an inclined, non-orthogonal DD rotary table. Utility Model Content

[0005] The purpose of this invention is to provide an inclined non-orthogonal DD rotary table to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, this utility model provides an inclined non-orthogonal DD rotary table, including a rotation axis and an inclined axis. The rotation center of the rotation axis and the inclined axis are set at 45° non-orthogonal. The rotation axis is locked to the inclined axis by an adapter ring.

[0007] Furthermore, the rotating shaft includes a housing, in which a motor stator is embedded. A bearing housing is threaded onto the housing, and a bearing is secured within the bearing housing by a snap ring. A rotating shaft is connected to the inner ring of the bearing. One end of the rotating shaft is bolted to a rotor adapter ring, and a motor rotor is bolted onto the rotor adapter ring. The other end of the rotating shaft is bolted to a flange, and an end cover is bolted onto the flange. An oil seal ring is provided between the end cover and the rotating shaft. A brake ring and an oil supply ring are provided at the rear end of the housing.

[0008] Furthermore, the rotating shaft also includes an encoder, which includes an encoder stator and an encoder rotor. The encoder stator and encoder rotor are respectively locked with an encoder fixing shaft and an encoder fixing ring. An air gap is provided between the encoder stator and the encoder rotor. The encoder fixing shaft is locked to the rear end of the rotating shaft by bolts. The encoder fixing ring is locked to the brake ring by bolts. An encoder cover is bolted to the brake ring.

[0009] Furthermore, an air gap is provided between the motor stator and the motor rotor.

[0010] Furthermore, the bearing is an angular contact ball bearing, and there are two bearings, which are arranged back-to-back on the rotating shaft.

[0011] Furthermore, the oil seal ring is a skeleton oil seal, and the lip of the oil seal ring is in close contact with the outer surface of the rotating shaft.

[0012] Furthermore, the intersection of the centers of rotation of the tilting axis and the rotating axis is located on the center line of the rotating axis.

[0013] Furthermore, the adapter ring has an L-shaped structure, with one side of the adapter ring being locked to the housing of the rotating shaft by bolts, and the other side of the adapter ring being locked to the rotating shaft of the tilting shaft by bolts.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. Adopting a non-orthogonal structural design, it breaks through the limitation of the rotation axis on the workpiece size in the traditional orthogonal layout, effectively expanding the processing space, enabling the equipment to accommodate and process larger workpieces, and meeting the processing needs of large parts.

[0016] The 2.45° non-orthogonal structure significantly reduces the rotational inertia of the turntable. Combined with the DD direct drive system, it enables the equipment to respond more quickly during acceleration and deceleration and track motion more accurately. It is especially suitable for high-speed dynamic adjustment when machining complex curved surfaces, thus improving machining efficiency and accuracy.

[0017] 3. A clamping brake structure replaces the traditional disc brake. Braking is achieved by using high-pressure oil to drive the brake rings to grip the rotating shaft, which occupies less axial space and makes the overall structure of the turntable more compact. Under the same braking torque, the equipment volume is significantly reduced, and space utilization is optimized.

[0018] 4. The non-orthogonal layout alters the motion trajectory of the rotating axis, significantly reducing the interference area during rotation and preventing collisions with workpieces or other components during processing. This not only expands the processing range but also improves the safety and reliability of equipment operation. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the overall external structure of this utility model;

[0020] Figure 2 This is a top view of the overall external structure of this utility model;

[0021] Figure 3 This is a cross-sectional view of the overall front of this utility model;

[0022] Figure 4This is a partial cross-sectional view of the present invention.

[0023] In the diagram: 1. Flange; 2. Bearing; 3. End cover; 4. Shaft; 5. Oil seal ring; 6. Bearing housing; 7. Housing; 8. Rotor adapter ring; 9. Motor stator; 10. Motor rotor; 11. Oil supply ring; 12. Brake ring; 13. Encoder cover; 14. Encoder stator; 15. Encoder rotor; 16. Encoder fixing shaft; 17. Encoder fixing ring; 18. Adapter ring; 20. Rotating shaft; 21. Tilting shaft. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 2 This utility model provides a technical solution: an inclined non-orthogonal DD rotary table, including a rotary shaft 20 and an inclined shaft 21. The rotation centers of the rotary shaft 20 and the inclined shaft 21 are set at 45° non-orthogonal. A transition ring 18 is provided between the rotary shaft 20 and the inclined shaft 21. The rotary shaft 20 is locked onto the inclined shaft 21 by the transition ring 18. The rotary shaft 20 includes a housing 7, in which a motor stator 9 is embedded. A bearing seat 6 is threaded onto the housing 7. A bearing 2 is locked into the bearing seat 6 by a snap ring. A rotating shaft 4 is connected to the inner ring of the bearing 2. One end of the rotating shaft 4 is locked with a rotor transition ring 8 by a bolt. The rotor adapter ring 8 locks the inherent motor rotor 10, and the other end of the shaft 4 is bolted to the inherent flange 1. The flange 1 is locked with the inherent end cover 3. An oil seal ring 5 is provided between the end cover 3 and the shaft 4 to seal the internal structure of the rotating shaft 20. The rear end of the housing 7 is provided with a brake ring 12 and an oil supply ring 11. The brake ring 12 is made of elastic material. The gap between the inner diameter of the brake ring 12 and the outer diameter of the shaft 4 is 0.1-0.3mm. High pressure oil is supplied to the oil supply ring 11. The oil pressure reduces the diameter of the brake ring 12, which grips the shaft 4 to achieve braking. When the high pressure oil is turned off, the brake ring 12 returns to its original state, and the brake is released.

[0026] In practice, the bearing seat 6 is rigidly connected to the housing 7 by bolts to form a stable support structure. Under normal conditions, the brake ring 12 and the rotating shaft 4 maintain a gap of 0.1-0.3mm, which does not affect the free rotation of the rotating shaft. When braking is required, the oil supply ring 11 supplies high-pressure oil. The oil pressure causes the inner diameter of the brake ring 12, made of elastic material, to shrink and clamp the rotating shaft 4 to achieve braking.

[0027] See Figure 3The rotating shaft 20 also includes an encoder, which includes an encoder stator 14 and an encoder rotor 15. The encoder stator 14 and encoder rotor 15 are respectively locked to an encoder fixing shaft 16 and an encoder fixing ring 17. An air gap of 0.5-1.5mm is provided between the encoder stator 14 and the encoder rotor 15. The encoder fixing shaft 16 is locked to the rear end of the rotating shaft 4 by bolts. The encoder fixing ring 17 is locked to the brake ring 12 by bolts. An encoder cover 13 is bolted to the brake ring 12 to protect the encoder.

[0028] In practice, the encoder fixed shaft 16 rotates synchronously with the rotating shaft 4, the angular position of the rotating shaft 4 is detected in real time, and the encoder signal is transmitted to the control system to realize closed-loop position control and ensure rotation accuracy.

[0029] See Figure 4 An air gap is provided between the motor stator 9 and the motor rotor 10. When the motor stator 9 is energized, it generates a rotating magnetic field, which drives the motor rotor 10 and the shaft 4 to rotate synchronously.

[0030] See Figure 1 Bearing 2 is an angular contact ball bearing 2. There are two bearings 2, which are arranged back to back on the rotating shaft 4 to bear radial and axial forces.

[0031] In practice, two angular contact ball bearings 2 are mounted back-to-back on the rotating shaft 4, which can withstand both radial and axial forces. The outer ring of the bearing 2 is fixed in the bearing housing 6 by a snap ring, and the inner ring is interference-fitted with the rotating shaft 4 to ensure precise transmission.

[0032] See Figure 1 The oil seal ring 5 is a skeleton oil seal. The lip of the oil seal ring 5 is in close contact with the outer surface of the rotating shaft 4 to prevent lubricating oil leakage and dust ingress.

[0033] See Figure 3 The encoder is an absolute encoder used to monitor the rotation angle and position of the rotating shaft 20 in real time. The intersection of the rotation centers of the tilting shaft 21 and the rotating shaft 20 is located on the center line of the rotating shaft 20. Both the tilting shaft 21 and the rotating shaft 20 are driven by DD direct drive motors.

[0034] In practice, both the tilt axis 21 and the rotary axis 20 adopt the same DD direct drive structure to achieve high-precision position control.

[0035] See Figure 2 The adapter ring 18 has an L-shaped structure. One side of the adapter ring 18 is locked to the housing 7 of the rotating shaft 20 by bolts, and the other side of the adapter ring 18 is locked to the rotating shaft of the tilting shaft 21 by bolts.

[0036] Working Principle: Complex machining posture adjustments are achieved through the coordinated motion of the tilting shaft 21 and the rotating shaft 20, which are arranged at a 45° non-orthogonal configuration. When the motor stator 9 is energized, it generates a rotating magnetic field, driving the cooperating motor rotor 10 to rotate. The motor rotor 10 is rigidly connected to the rotating shaft 4 via a rotor adapter ring 8, directly driving the rotating shaft 4 to rotate. Both the tilting shaft 21 and the rotating shaft 20 adopt the same DD direct drive structure, achieving high-precision position control. Two angular contact ball bearings 2 are mounted back-to-back on the rotating shaft 4, capable of withstanding both radial and axial forces. The outer ring of the bearing 2 is fixed in the bearing housing 6 by a snap ring, and the inner ring is interference-fitted with the rotating shaft 4 to ensure precise transmission. The bearing housing 6 is rigidly connected to the housing 7 by bolts, forming a stable support structure.

[0037] Under normal conditions, a gap of 0.1-0.3mm is maintained between the brake ring 12 and the rotating shaft 4, which does not affect the free rotation of the rotating shaft 4. When braking is required, high-pressure oil is supplied through the oil supply ring 11. The oil pressure causes the inner diameter of the brake ring 12, made of elastic material, to contract, gripping the rotating shaft 4 to achieve braking. After the high-pressure oil is released, the brake ring 12 returns to its original shape, releasing the braking state. The encoder fixed shaft 16 rotates synchronously with the rotating shaft 4, detecting the angular position of the rotating shaft 4 in real time. The encoder signal is transmitted to the control system to achieve closed-loop position control and ensure rotational accuracy. When the tilting shaft 21 rotates, it drives the entire rotating shaft 20 to rotate around the center of the tilting shaft through the adapter ring 18. The rotating shaft 20 can rotate independently around its own axis, forming a compound motion with the tilting shaft 21. The 45° non-orthogonal layout of the rotation centers of the two axes gives the worktable a unique advantage when adjusting its spatial posture, reducing the interference area.

[0038] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A tilted non-orthogonal rotary table, comprising a rotation axis (20) and a tilting axis (21), characterized in that, The rotation axis (20) is non-orthogonal to the rotation center of the tilt axis (21) at 45°, and the rotation axis (20) is locked to the tilt axis (21) by a transition ring (18).

2. The inclined non-orthogonal rotary table as described in claim 1, characterized in that: The rotating shaft (20) includes a housing (7), in which a motor stator (9) is embedded. A bearing seat (6) is threaded onto the housing (7). A bearing seat (6) is secured to a bearing (2) by a snap ring. A rotating shaft (4) is connected to the inner ring of the bearing (2). One end of the rotating shaft (4) is secured to a rotor adapter ring (8) by bolts. A motor rotor (10) is secured to the rotor adapter ring (8). The other end of the rotating shaft (4) is secured to a flange (1) by bolts. An end cover (3) is secured to the flange (1). An oil seal ring (5) is provided between the end cover (3) and the rotating shaft (4). A brake ring (12) and an oil supply ring (11) are provided at the rear end of the housing (7).

3. The inclined non-orthogonal rotary table as described in claim 2, characterized in that: The rotating shaft (20) also includes an encoder, which includes an encoder stator (14) and an encoder rotor (15). The encoder stator (14) and the encoder rotor (15) are respectively locked to an encoder fixing shaft (16) and an encoder fixing ring (17). An air gap is provided between the encoder stator (14) and the encoder rotor (15). The encoder fixing shaft (16) is bolted to the rear end of the rotating shaft (4). The encoder fixing ring (17) is bolted to the brake ring (12). An encoder cover (13) is bolted to the brake ring (12).

4. The inclined non-orthogonal rotary table as described in claim 3, characterized in that: An air gap is provided between the motor stator (9) and the motor rotor (10).

5. The inclined non-orthogonal rotary table as described in claim 4, characterized in that: The bearing (2) is an angular contact ball bearing (2), and there are two bearings (2), which are arranged back to back on the rotating shaft (4).

6. The inclined non-orthogonal rotary table as described in claim 5, characterized in that: The oil seal ring (5) is a skeleton oil seal, and the lip of the oil seal ring (5) is in close contact with the outer surface of the rotating shaft (4).

7. The inclined non-orthogonal rotary table as described in claim 6, characterized in that: The intersection of the center of rotation of the tilting axis (21) and the rotation axis (20) is located on the center line of the rotation axis (20).

8. The inclined non-orthogonal DD rotary table as described in claim 7, characterized in that: The adapter ring (18) has an L-shaped structure. One side of the adapter ring (18) is locked to the housing (7) of the rotating shaft (20) by bolts, and the other side of the adapter ring (18) is locked to the rotating shaft of the inclined shaft (21) by bolts.

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