Novel permanent magnet direct drive rotary table with indexing function

Abstract

The utility model discloses a novel permanent magnet direct drive rotary table with an indexing function, belongs to the technical field of rotary tables, and particularly relates to a novel permanent magnet direct drive rotary table with an indexing function, which comprises a base (1), a working table (2) and a driving unit (3), the driving unit (3) drives the workbench (2) to rotate relative to the base (1) through the slewing bearing (7), the driving unit (3) is arranged on the outer side of the slewing bearing (7), the driving unit (3) comprises a stator assembly (31) and a rotor assembly (32), the stator assembly (31) is fixedly connected with the base (1), and the rotor assembly (32) is fixedly connected with the workbench (2). According to the technical scheme, the novel permanent magnet direct drive rotary table with the indexing function is simple in structure, high in efficiency and high in rotation precision, and the rotating speed and torque of the rotary table can be designed in a personalized mode more conveniently.

Description

Technical Field

[0001] The utility model belongs to the technical field of turntables, and particularly relates to a novel permanent magnet direct-drive turntable with a dividing function. Background Art

[0002] The indexing turntable, also known as the rotary table, refers to a rotatable worktable with indexing function. The workpiece is clamped on the worktable to achieve the functions of rotation and indexing positioning. The indexing turntable includes a worktable and a base. The worktable and the base are connected by a slewing bearing. The indexing turntable is also provided with a driving device for driving the worktable to rotate relative to the base through the slewing bearing.

[0003] The Chinese utility model patent with announcement number CN218800966U discloses a graduated turntable with a built-in rotating shaft, including a turntable body, a No. 1 motor for driving the body to rotate, and a permanent magnet motor for driving the rotating shaft to rotate. However, the technical solution of the utility model adopts two sets of drive devices, and the permanent magnet motor is used to drive the rotating shaft. This structure is relatively complicated. In addition, since the permanent magnet motor is directly arranged inside the turntable, the heat dissipation of the stator is also a problem that needs to be considered and solved. Utility Model Content

[0004] In order to solve the above-mentioned problems existing in the indexing turntable structure, the utility model provides a new type of permanent magnet direct-drive turntable with indexing function, which has a simple structure, high efficiency, high rotation accuracy, and is more convenient for personalized design of the turntable speed and torque.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A novel permanent magnet direct-drive turntable with indexing function comprises a base, a worktable and a drive unit, wherein the base and the worktable are connected via a slewing bearing, the drive unit drives the worktable to rotate relative to the base via the slewing bearing, and the drive unit is arranged on the outside of the slewing bearing.

[0007] Furthermore, the driving unit includes a stator assembly and a rotor assembly, the stator assembly is fixedly connected to the base, and the rotor assembly is fixedly connected to the workbench.

[0008] Furthermore, the driving unit is electrically connected to the control unit.

[0009] Furthermore, the control unit comprises an excitation control circuit for braking the drive unit.

[0010] Furthermore, an inner cavity is provided between the base, the workbench and the driving unit.

[0011] Furthermore, a locking mechanism is provided between the base and the workbench.

[0012] Furthermore, a locking mechanism is provided between the base and the workbench, and the locking mechanism is provided in the inner cavity.

[0013] Furthermore, a position sensor is provided between the base and the workbench, and the position sensor is electrically connected to the control unit.

[0014] Further, the stator assembly surrounds the rotor assembly.

[0015] Further, the rotor assembly surrounds the stator assembly.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The technical solution of this utility model patent provides a new type of permanent magnet direct drive turntable with indexing function, which realizes direct drive, indexing positioning and locking of the worktable. With the above technical solution, the speed measurement and positioning as well as the rotation accuracy of the worktable are high, which is convenient for processing and manufacturing. In addition, the utility model has fewer parts and is more convenient to install.

[0018] 2. The technical solution of the utility model adopts a permanent magnet direct drive motor to be arranged on the outside of the turntable slewing bearing. This structural design can arbitrarily design the speed and torque of the motor according to the use requirements of the turntable, and is not limited by the size of the turntable slewing bearing; this structural design is beneficial to the heat dissipation and cooling of the permanent magnet direct drive motor, and is beneficial to controlling the temperature rise of the slewing bearing and the worktable, thereby improving the rotation accuracy of the turntable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a new type of indexing permanent magnet direct-drive turntable;

[0020] Figure 2 This is a schematic diagram of the structure of the drive unit rotor surrounding the stator;

[0021] Figure 3 This is a schematic diagram of the structure of the drive unit stator surrounding the rotor;

[0022] Figure 4 Schematic diagram of the locking mechanism.

[0023] In the figure: 1. base; 2. workbench; 3. drive unit; 4. position sensor; 5. locking mechanism; 6. control unit; 7. slewing bearing; 8. inner cavity

[0024] 31. stator assembly; 32. rotor assembly;

[0025] 51. Oil cylinder; 52. Brake pad. DETAILED DESCRIPTION

[0026] The technical solution of the utility model is described in detail below in conjunction with the embodiments and corresponding drawings so that those skilled in the art can more clearly understand the technical solution of the utility model, but the protection scope of the utility model is not limited thereby.

[0027] like Figure 1 to Figure 4 As shown, a novel permanent magnet direct-drive turntable with indexing function includes a base 1, a worktable 2 and a drive unit 3. The base 1 and the worktable 2 are connected via a slewing bearing 7. The drive unit 3 drives the worktable 2 to rotate relative to the base 1 via the slewing bearing 7. The drive unit 3 is arranged on the outside of the slewing bearing 7. The drive unit 3 includes a stator assembly 31 and a rotor assembly 32. The stator assembly 31 is fixedly connected to the base 1, and the rotor assembly 32 is fixedly connected to the worktable 2. Figure 3 As shown, the stator assembly 31 surrounds the rotor assembly 32; Figure 2 As shown, the rotor assembly 32 can also be used to surround the stator assembly 31. This structural design adopts a set of permanent magnet motor direct drive structural design, so that the structure of the turntable is simple, the efficiency is high, and the rotation accuracy is high; the drive unit 3 is arranged on the outside of the slewing bearing 7, which is more conducive to the heat dissipation of the drive unit 3 during the rotation process, and this structural design allows the motor speed and torque to be arbitrarily designed according to needs without being restricted by the size of the slewing bearing 7. For example, when the direct-drive turntable is used for a vertical lathe, some vertical lathes only need rough turning, at this time, the working state of the machine tool is low speed and high torque; some vertical lathes only need fine turning, at this time, the working state of the machine tool is high speed and low torque; some vertical lathes are used for both rough turning and fine turning, and the working state of the machine tool is both. For example, when the direct-drive turntable is used for a displacement turntable that only performs indexing operations, only indexing power needs to be provided at this time, and turning torque is no longer required. Therefore, since the drive unit 3 is arranged on the outside of the slewing bearing 7 and is not limited by the size of the slewing bearing 7, the diameter of the drive unit 3 can be made larger within the structural range of the turntable. Therefore, the drive unit 3 can be optimally designed according to the user's usage characteristics, so that the speed and torque of the motor can be arbitrarily designed according to needs.

[0028] Preferably, if Figure 1As shown, the driving unit 3 is electrically connected to the control unit 6. The control unit 6 controls the rotation of the driving unit 3; the control unit 6 includes an excitation control circuit for braking the driving unit 3, and utilizes the excitation current to brake the driving unit 3, thereby achieving the braking of the turntable. It should be noted here that the permanent magnet synchronous motor is locked by the excitation current. Since the electromagnetic torque is only generated when the stator and rotor are displaced, that is, the current will not generate torque when the rotor is in a stationary state. For example, when the machine tool is not processing, the turntable is not subjected to cutting force. At this time, the turntable is in a stationary state, and the excitation current does not generate torque. When the machine tool is cutting, the turntable is subjected to the tangential component of the cutting force. At this time, the rotor will be offset relative to the stator under the action of the tangential force. At this time, the excitation current will generate an opposite torque to pull the rotor back to the initial position. Since cutting is continuous, the rotor will continue to be affected by the cutting force and produce a small displacement. The excitation current will also continue to generate a reverse torque to return the rotor to the initial position. In this way, the cutting force and the electromagnetic force form a tug-of-war, so that the turntable is always in a micro-swinging state, and the excitation current will also increase the heat generation of the motor. When the turntable is used for any workstation that requires rotation and displacement, such as a marking workbench, a detection workbench, etc., the workbench does not need to be locked at this time, and this structure can be used.

[0029] Preferably, if Figure 1 As shown, an inner cavity 8 is provided between the base 1 and the workbench 2 and the drive unit 3. Since the drive unit 3 is provided on the outside of the slewing bearing 7, an inner cavity 8 can be provided between the base 1 and the workbench 2 and the drive unit 3. For example, the inner cavity 8 can be provided as an annular accommodating cavity, or can be designed as a structure consisting of multiple cavities according to structural requirements. For example, the inner cavity 8 can also be provided to cool the motor by air cooling, water cooling or oil cooling device or a combination thereof, which can effectively solve the heat dissipation problem of the direct-drive turntable drive unit 3 and the slewing bearing 7.

[0030] Preferably, if Figure 1 As shown, a locking mechanism 5 is provided between the base 1 and the worktable 2. For example, the locking mechanism 5 is a mechanical braking device, which can avoid the influence of heat generated by the excitation current braking on the rotation accuracy of the turntable. When used in a cutting machine tool, the worktable 2 can be effectively braked to accurately position the turntable. The braking force is strong and it is more suitable for providing sufficient braking force for a large turntable.

[0031] Preferably, if Figure 1 and Figure 4As shown, a locking mechanism 5 is provided between the base 1 and the workbench 2, and the locking mechanism 5 is provided in the inner cavity 8. This structural design can reduce the height of the entire turntable, reduce the weight of the turntable, and expand the application scenarios of the turntable. For example, the locking mechanism 5 can be one piece or multiple pieces, and the locking mechanism 5 includes a cylinder 51 and a brake pad 52. When locking is required, the cylinder works to drive the brake pad to hold the workbench 2 tightly, so that the workbench 2 is locked.

[0032] Preferably, a position sensor 4 is provided between the base 1 and the workbench 2, and the position sensor 4 is electrically connected to the control unit 6. The rotation of the workbench 2 drives the rotation axis of the position sensor 4 to rotate, and the position sensor 4 feeds back the rotation angle position of the workbench 2 to the control unit 6 in real time. When the real-time rotation position of the workbench 2 meets the set value, the control unit 6 issues a rotation positioning instruction to stop the driving unit 3 from rotating, that is, to control the workbench 2 to stop rotating, and complete the indexing positioning of the workbench 2.

[0033] It should also be noted that when the turntable is used as a working part of other machine tools, such as a workbench of a vertical lathe, the control unit 6 can be designed in combination with the control system of the vertical lathe; when the turntable is used as an independent working device, such as only used as a dividing turntable, the control unit 6 can be set on the base.

[0034] The above is a detailed description of the implementation of the utility model patent in conjunction with the accompanying drawings, but the utility model patent is not limited to the described implementation. For ordinary technicians in this field, various changes, modifications, substitutions and deformations of these implementations without departing from the principle and spirit of the utility model patent still fall within the scope of protection of the utility model patent.

Claims

1. A novel permanent magnet direct-drive turntable with indexing function, comprising a base (1), a worktable (2) and a drive unit (3), wherein the base (1) and the worktable (2) are connected via a slewing bearing (7), and the drive unit (3) drives the worktable (2) to rotate relative to the base (1) via the slewing bearing (7), characterized in that: The drive unit (3) is arranged outside the slewing bearing (7).

2. According to claim 1, a new type of permanent magnet direct drive turntable with indexing function is characterized in that: The driving unit (3) comprises a stator assembly (31) and a rotor assembly (32); the stator assembly (31) is fixedly connected to the base (1), and the rotor assembly (32) is fixedly connected to the workbench (2).

3. A new type of permanent magnet direct drive turntable with indexing function according to claim 1 or 2, characterized in that: The driving unit (3) is electrically connected to the control unit (6).

4. The novel permanent magnet direct-drive turntable with indexing function according to claim 3 is characterized in that: The control unit (6) comprises an excitation control circuit for braking the drive unit (3).

5. The novel permanent magnet direct-drive turntable with indexing function according to claim 1 is characterized in that: An inner cavity (8) is provided between the base (1), the workbench (2) and the drive unit (3).

6. The novel permanent magnet direct-drive turntable with indexing function according to claim 1 is characterized in that: A locking mechanism (5) is provided between the base (1) and the workbench (2).

7. The novel permanent magnet direct-drive turntable with indexing function according to claim 5 is characterized in that: A locking mechanism (5) is provided between the base (1) and the workbench (2), and the locking mechanism (5) is provided in the inner cavity (8).

8. The novel permanent magnet direct-drive turntable with indexing function according to claim 3 is characterized in that: A position sensor (4) is provided between the base (1) and the workbench (2), and the position sensor (4) is electrically connected to a control unit (6).

9. The novel permanent magnet direct-drive turntable with indexing function according to claim 2 is characterized in that: The stator assembly (31) surrounds the rotor assembly (32).

10. The novel permanent magnet direct-drive turntable with indexing function according to claim 2 is characterized in that: The rotor assembly (32) surrounds the stator assembly (31).

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