Motor direct drive rotary table and machine tool

Abstract

The utility model relates to the field of machine tool equipment discloses a motor direct drive rotary table and machine tool, motor direct drive rotary table includes rotating shaft, carousel, bearing, shell and with rotating shaft coaxial arrangement's moment motor, moment motor includes motor rotor and motor stator, motor rotor and rotating shaft fixed link, and motor stator is fixed in the inner wall of casing, still include connecting piece, and connecting piece is rotatablely connected with rotating shaft through bearing, rotating shaft and carousel are integrally formed structure, and rotating shaft is inserted in the shell, and is fixedly connected with the shell through connecting piece to make motor rotor and motor stator coaxial cooperation assembly, the utility model is easy to assemble, and through rotating shaft and carousel adopt higher rigidity integrally formed structure to be favorable to improving assembly accuracy and working performance.

Description

Technical Field

[0001] This utility model relates to the field of machine tool equipment technology, and in particular to a direct-drive rotary table and machine tool. Background Technology

[0002] Direct drive rotary tables, also known as direct drive rotary worktables, are precision rotating devices in machine tools. They use direct drive technology to connect the worktable directly to the motor, eliminating the need for transmission devices such as gears or belts between the torque motor and the worktable. This results in numerous advantages, including high precision, high positioning accuracy, and high reliability, making them highly favored in various application scenarios.

[0003] In the technical solution disclosed in Chinese patent CN222492201U, the rotating shaft of the torque motor includes a first rotating shaft and a second rotating shaft coaxially connected. The end of the first rotating shaft away from the second rotating shaft extends out of the front end cover and is fixedly connected to the turntable. The existing turntable and rotating shaft adopt a separate installation structure, which is not only more complicated to install and difficult to ensure assembly accuracy, but also reduces the rigidity of the rotating shaft. It is easy to produce slight torsional deformation under high speed and high torque load, which affects the dynamic response accuracy. Utility Model Content

[0004] This utility model aims to at least solve the technical problems of difficult assembly and reduced rigidity and strength caused by the separate installation structure of the motor rotating shaft in the prior art. It proposes a motor direct drive turntable and machine tool, in which the rotating shaft and turntable adopt a more rigid integrated molding structure, which is conducive to improving assembly accuracy and working performance.

[0005] This utility model proposes a direct-drive turntable for a motor, including a rotating shaft, a turntable, bearings, a housing, and a torque motor coaxially arranged with the rotating shaft. The torque motor includes a motor rotor and a motor stator. The motor rotor is fixedly connected to the rotating shaft, and the motor stator is fixed to the inner wall of the housing. It also includes a connecting member, which is rotatably connected to the rotating shaft through the bearings. The rotating shaft and the turntable are integrally formed. The rotating shaft is inserted into the housing and fixedly connected to the housing through the connecting member so that the motor rotor and the motor stator are coaxially fitted and assembled.

[0006] In some preferred embodiments, the outer diameter of the turntable is larger than the outer diameter of the rotating shaft, and there is a misalignment between the end of the turntable and the end of the rotating shaft to form a first step; an oil seal is provided between the first step and the connector, so that when the connector and the fixed part of the bearing are fixedly connected, the oil seal and the first step form a sealing fit.

[0007] In some preferred embodiments, a support step is provided on the inner wall of the connector, the oil seal is fixed on the support step, and the support step is fixedly connected to the fixed part of the bearing.

[0008] In some preferred embodiments, a second step is provided on the outer wall of the rotating shaft, located below the first step. The outer diameter of the second step is smaller than that of the first step, and the rotating part of the bearing is fixedly assembled with the second step.

[0009] In some preferred embodiments, a third step is provided on the outer wall of the rotating shaft, located below the second step. The outer diameter of the third step is smaller than that of the second step, and the motor rotor is fixed at the third step.

[0010] In some preferred embodiments, a fourth step is provided at the lower end of the rotating shaft. The outer diameter of the fourth step is smaller than that of the third step, and a grating code disk is fixed on the fourth step.

[0011] In some preferred embodiments, the connector is provided with a plurality of sixth fixing holes, and a plurality of seventh fixing holes are provided on the upper end face of the housing. The connector and the housing are fixedly assembled by the fastener passing through the sixth fixing holes and the corresponding seventh fixing holes.

[0012] This utility model also discloses a machine tool that uses the aforementioned direct-drive rotary table.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] This invention designs the rotating shaft and turntable as an integral structure, and adds a connecting part to further simplify the assembly of the turntable. The connecting part is designed to be rotatably connected to the rotating shaft through a bearing, thereby quickly completing the assembly of the rotating part of the turntable. The assembly operation is simple and easy to ensure assembly accuracy. After the rotating shaft is inserted into the outer shell, the connecting part is fixedly assembled with the outer shell, thus completing the assembly of the rotating part and the fixed part of the turntable. The assembly operation is simple and convenient.

[0015] By designing the rotating shaft and turntable as an integral structure, compared with the existing split structure, the number of parts is reduced, which is conducive to simplifying assembly. At the same time, it is beneficial to improve the rigidity and strength of the rotating shaft itself and the connection strength between the rotating shaft and the turntable, reduce the assembly error between the rotating shaft and the turntable, and ensure that the torsional deformation of the turntable is small under high speed and high torque load, thereby improving the dynamic response accuracy of the turntable. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the direct-drive rotary table of the motor in this application.

[0017] Figure 2 This is an exploded structural diagram of the direct-drive turntable of the motor in this application.

[0018] Figure 3 It is a three-dimensional structural diagram of the rotating shaft, connecting parts and bearings.

[0019] Figure 4 This is a partial cross-sectional structural diagram of the direct-drive turntable of the motor in this application, without showing the motor stator and housing. Detailed Implementation

[0020] To further illustrate the technical means and effects adopted by this application to achieve its intended purpose, the specific implementation methods, structures, features, and effects according to this application are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0021] This application proposes a direct-drive turntable for motors, in which the rotating shaft and turntable adopt a more rigid one-piece molding structure, which is beneficial to improving assembly accuracy and working performance.

[0022] Combination Figures 1-4 As shown, the turntable specifically includes a rotating shaft 1, a turntable 2, a bearing 5, a housing 8, and a torque motor coaxially arranged with the rotating shaft 1. The torque motor includes a motor rotor 6 and a motor stator 9. The motor rotor 6 is fixedly connected to the rotating shaft 1, and the motor stator 9 is fixed to the inner wall of the housing 8. It also includes a connecting piece 3, which is rotatably connected to the rotating shaft 1 through the bearing 5. The rotating shaft 1 and the turntable 2 are integrally formed. The rotating shaft 1 is inserted into the housing 8, and the connecting piece 3 is fixedly connected to the housing 9 so that the motor rotor 6 and the motor stator 9 are coaxially fitted together.

[0023] The rotating shaft 1, turntable 2, rotating parts of bearing 5, and motor rotor 6 constitute the rotating part of the turntable, while the fixed part of bearing 5, connecting parts 3, housing 8, and motor stator 9 constitute the fixed part of the turntable. Those skilled in the art will understand that the motor stator 9 drives the motor rotor 6 to rotate, and the motor rotor 6 directly drives the rotating part of the turntable to rotate relative to the fixed part of the turntable using bearing 5, thereby using the turntable to transport the workpiece fixed on the turntable 2 to the required workstation.

[0024] This application integrates the rotating shaft 1 and the turntable 2 into a single structure, which reduces the number of parts compared to the separate structure of the prior art, thus simplifying assembly. At the same time, it helps to improve the rigidity of the rotating shaft 1 itself and the connection strength between the rotating shaft 1 and the turntable 2, reduces the assembly error between the rotating shaft 1 and the turntable 2, and ensures that the torsional deformation of the turntable is small under high speed and high torque load, thereby improving the dynamic response accuracy of the turntable.

[0025] Meanwhile, this application designs the rotating shaft 1 and the turntable 2 as an integral structure, and adds a connecting part 3 to further simplify the assembly of the turntable. The connecting part 3 is designed to be rotatably connected to the rotating shaft 1 through the bearing 5, thereby quickly completing the assembly of the rotating part of the turntable. The assembly operation is simple and easy to ensure assembly accuracy. After the rotating shaft 1 is inserted into the outer shell 8, the connecting part 3 is fixedly assembled with the outer shell 8, thus completing the assembly of the rotating part and the fixed part of the turntable. The assembly operation is simple and convenient.

[0026] Since the outer diameter of turntable 2 is larger than the outer diameter of rotating shaft 1, there is a misalignment between the end of turntable 2 and rotating shaft 1 to form a first step 11. The bearing 5 is located below the first step 11 away from turntable 2. An oil seal 4 is provided between the first step 11 and the connecting part 3. The oil seal 4 makes the rotating part of the turntable sealed relative to the fixed part of the turntable, preventing foreign objects from entering the turntable and affecting the operation of the turntable during use.

[0027] To simplify the assembly of the oil seal 4, a support step 32 is provided on the inner wall of the connector 3. The oil seal 4 is fixed on the support step 32. After the bearing 5 is fixed in the assembly hole 31 in the center of the connector 3, when the bearing 5 is further fixed and assembled to the rotating shaft 1, a sealing fit is formed between the oil seal 4 and the first step 11.

[0028] A second step 12 and a third step 13 are sequentially provided at different heights on the outer side wall of the rotating shaft 1. The third step 13 is located below the second step 12, and the outer diameter of the third step 13 is r3, the outer diameter of the second step 12 is r2, the outer diameter of the first step 11 is r1, and r3 < r2 < r1. The rotating part of the bearing 5 is fixed at the second step 12, the fixed part of the bearing 5 is fixedly connected to the support step 32 of the connector 3, and the motor rotor 6 is fixed at the third step 13.

[0029] Specifically, the second step 12 and the third step 13 are respectively provided in several second fixing holes 121 and third fixing holes 131, and the supporting step 32 of the connector 3 is provided with several fourth fixing holes 321. The rotating part of the bearing 5 is fixedly assembled with the second fixing holes 121 of the second step 12 through the fixing member, and the rotating part of the bearing 5 is fixedly assembled with the fourth fixing holes 321 of the connector 3 through the fixing member. The motor rotor 6 is provided with several fifth fixing holes 61. By using the fixing member to pass through the fifth fixing holes 61 and fix it with the corresponding third fixing holes 131, the motor rotor 6 can be fixed on the third step 13 of the rotating shaft 1.

[0030] The connecting parts are conventional fixing structures such as screws and rivets, and are not limited here.

[0031] A fourth step 14 is provided at the lower end of the rotating shaft 1. The outer diameter of the fourth step 14 is r4, r4 < r3. A grating code disk 7 is fixed on the fourth step 14.

[0032] Furthermore, the connector 3 is provided with a number of sixth fixing holes 34, and a number of seventh fixing holes 81 are provided on the upper end face of the outer shell 8. By using the fastener to pass through the sixth fixing holes 34 and fix it to the corresponding seventh fixing holes 81, the connector 3 and the outer shell 8 can be fixedly assembled.

[0033] When assembling the turntable, first assemble the rotating part of the turntable, and then assemble the rotating part of the turntable with the fixed part of the turntable. The assembly is simple and quick.

[0034] The specific assembly process of the rotating part of the turntable is as follows: First, the connector 3 and bearing 5 are sleeved on the outside of the rotating shaft 1, so that the upper end face of the connector 3 abuts against the first step 11 of the rotating shaft 1, and the upper end face of the bearing 5 abuts against the second step 12 of the rotating shaft 1. The rotating part of the bearing 5 is fixedly assembled with the second fixing hole 121 of the second step 12 through the fixing part, and the rotating part of the bearing 5 is fixedly assembled with the fourth fixing hole 321 of the connector 3 through the fixing part. At this time, the connector 3 forms a rotatable sealed connection with the first step 11 of the rotating shaft 1 through the oil seal 4. Second, the motor rotor 6 is fixed on the third step 13 of the rotating shaft 1, and the grating code disk 7 is fixed on the fourth step 14 of the rotating shaft 1.

[0035] The assembly process of the rotating part and the fixed part of the turntable is as follows: Insert the lower end of the rotating shaft 1 into the housing 8. At this time, the motor rotor 6 and the motor stator 9 form a coaxial relationship. The fixing piece passes through the sixth fixing hole 34 of the connector 3 from bottom to top and is fixedly connected to the seventh fixing hole 81 of the housing 8, thus completing the fixed assembly of the rotating part and the fixed part of the turntable.

[0036] This utility model also discloses a machine tool that uses the aforementioned direct-drive rotary table.

[0037] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A direct-drive turntable, comprising a rotating shaft, a turntable, bearings, a housing, and a torque motor coaxially arranged with the rotating shaft, the torque motor comprising a motor rotor and a motor stator, the motor rotor being fixedly connected to the rotating shaft, and the motor stator being fixed to the inner wall of the housing; characterized in that, It also includes a connector, which is rotatably connected to the rotating shaft via a bearing; the rotating shaft and the turntable are integrally formed, the rotating shaft is inserted into the housing, and is fixedly connected to the housing via the connector so that the motor rotor and the motor stator are coaxially fitted together.

2. The direct-drive rotary table according to claim 1, characterized in that, The outer diameter of the turntable is larger than the outer diameter of the rotating shaft, and there is a misalignment between the end of the turntable and the end of the rotating shaft to form a first step; an oil seal is provided between the first step and the connecting part, so that when the connecting part and the fixed part of the bearing are fixedly connected, the oil seal and the first step form a sealing fit.

3. The direct-drive rotary table according to claim 2, characterized in that, A support step is provided on the inner wall of the connector, the oil seal is fixed on the support step, and the support step is fixedly connected to the fixed part of the bearing.

4. The direct-drive rotary table according to claim 2, characterized in that, A second step is provided on the outer wall of the rotating shaft, located below the first step. The outer diameter of the second step is smaller than that of the first step, and the rotating part of the bearing is fixedly assembled with the second step.

5. The direct-drive rotary table according to claim 4, characterized in that, A third step is provided on the outer wall of the rotating shaft, located below the second step. The outer diameter of the third step is smaller than that of the second step, and the motor rotor is fixed at the third step.

6. The direct-drive rotary table according to claim 5, characterized in that, A fourth step is provided at the lower end of the rotating shaft. The outer diameter of the fourth step is smaller than that of the third step. A grating code disk is fixed on the fourth step.

7. The direct-drive rotary table according to claim 1, characterized in that, The connector is provided with several sixth fixing holes, and several seventh fixing holes are provided on the upper end face of the outer shell. The connector and the outer shell are fixedly assembled by the fastener passing through the sixth fixing holes and the corresponding seventh fixing holes.

8. A machine tool, characterized in that, The direct-drive rotary table as described in any one of claims 1-7 is adopted.

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