Magnetic coupling double-motion combined motor

Abstract

The invention provides a magnetic coupling double-motion combined motor, which comprises a rotary driving motor, a linear driving motor, a magnetic coupling lead screw nut and a magnetic coupling sliding sleeve, and is characterized in that an output shaft of the rotary driving motor is a hollow shaft, an output shaft of the linear driving motor is a lead screw shaft, and the lead screw shaft is coaxially arranged in the hollow shaft; the magnetic coupling lead screw nut is contained between the lead screw shaft and the hollow shaft, the magnetic coupling sliding sleeve is arranged on the outer surface of the hollow shaft, and the magnetic coupling sliding sleeve synchronously and linearly moves in the axial direction of the hollow shaft along with the magnetic coupling lead screw nut through magnetic attraction force and rotates along with the hollow shaft. According to the mechanism, linear motion and rotary motion are achieved through coaxial arrangement of the lead screw shaft and the hollow rotating shaft, the structure is compact, and occupied space is small; magnetic coupling transmission is adopted, so that the movement mechanism has an overload protection function; the lead screw transmission mechanism is arranged in the hollow shaft, so that the influence of the use environment on the movement mechanism can be effectively reduced.

Description

Technical Field

[0001] The invention relates to a motor structure, in particular to a combined motor structure capable of realizing linear and rotational dual motions. Background Art

[0002] In the field of automation equipment, combined rotation and linear motion control is often required. The existing technology usually uses two separate motors to achieve rotation and linear motion through the combination of the motor and an external mechanical transmission mechanism. The overall structure is relatively complex and is not suitable for application in places with limited space.

[0003] Chinese patent publication number CN112953105A discloses a novel dual-motion mechanism, which adopts a coaxial screw and a slide rail sleeve. The rotation and linear motion of the nut sleeve are realized by sliding the insert block extending from the nut in the axial through groove opened in the side wall of the slide rail sleeve. The structure is simple and occupies little space. However, the main problems of this patent are: the side wall of the slide rail sleeve is provided with an open axial through groove, and the screw is exposed to the working environment. When used for a long time, dust and rust are easily accumulated on the surface of the screw, increasing the maintenance cost; the nut sleeve is directly connected to the driving load, and when an overload occurs, mechanical deformation or winding overcurrent damage is likely to occur. Summary of the invention

[0004] The main purpose of the present invention is to provide a magnetically coupled dual-motion combined motor to solve the defects in the prior art.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is to provide a magnetically coupled dual-motion combined motor, which at least includes a rotary drive motor, a linear drive motor, a magnetically coupled lead screw nut and a magnetically coupled sleeve; the output shaft extending from the rotary drive motor is a hollow shaft, the hollow shaft adopts a seamless tube, and the inner and outer surfaces of the hollow shaft are provided with at least one guide slideway penetrating along the axial direction; the output shaft extending from the linear drive motor is a lead screw shaft, and the lead screw shaft is coaxially arranged in the hollow shaft; the magnetically coupled lead screw nut consists of a lead screw nut meshing with the lead screw shaft and a nut magnet The magnetic coupling sleeve is composed of a coupling body, which is accommodated between the screw shaft and the hollow shaft; a nut guide portion that cooperates with the guide slide is provided on the magnetic coupling screw nut, and the nut guide portion is used to prevent the magnetic coupling screw nut from rotating relative to the hollow shaft; the magnetic coupling sleeve is arranged on the outer surface of the hollow shaft, and the magnetic coupling sleeve is provided with a sleeve coupling magnet that cooperates with the nut magnetic coupling body, the magnetic poles on the inner surface of the sleeve magnetic coupling body are different from the magnetic poles on the outer surface of the nut magnetic coupling body, and the magnetic coupling sleeve relies on the magnetic attraction between the magnetic coupling sleeve and the magnetic coupling screw nut to move synchronously along the axial direction of the hollow shaft with the magnetic coupling screw nut.

[0006] Furthermore, a sleeve guide portion cooperating with the guide slideway is provided on the magnetic coupling sleeve, and the sleeve guide portion is used to prevent the magnetic coupling sleeve from rotating relative to the hollow shaft.

[0007] Furthermore, the nut magnetic coupling body adopts no less than one nut permanent magnetic ring and nut magnetic conductive ring, and the nut permanent magnetic ring and the nut magnetic conductive ring are arranged in an intermittent and stacked manner and are coaxially fixedly connected with the screw nut.

[0008] Furthermore, the sleeve coupling magnet adopts no less than one sleeve permanent magnet ring and sleeve magnetic conductive ring, and the sleeve permanent magnet ring and the sleeve magnetic conductive ring are arranged in an intermittent and stacked manner and are coaxial with the hollow shaft.

[0009] Furthermore, a nut magnetic conductive tooth groove is arranged on the outer edge of the nut magnetic conductive ring.

[0010] Furthermore, a sliding sleeve magnetic conductive tooth groove is arranged on the inner edge of the sliding sleeve magnetic conductive ring.

[0011] Optionally, the hollow shaft is connected to the rotating shaft of the rotary drive motor via a hollow reduction mechanism.

[0012] Optionally, the screw nut comprises an anti-backlash screw nut.

[0013] Optionally, the rotary drive motor and the linear drive motor are provided with a rotary encoder for closed-loop control of the drive motor.

[0014] Due to the adoption of the above technical scheme, compared with the existing technology, the present invention has the following advantages: linear motion and rotational motion are realized by coaxial arrangement of the screw shaft and the hollow rotating shaft, the structure is compact and takes up little space; the use of magnetic coupling transmission can avoid overload damage and improve equipment safety; the screw transmission mechanism is placed in the hollow shaft, which can reduce the impact of the use environment on the screw motion mechanism, has a wide range of applicable environments, and reduces maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an external view of an embodiment of the present invention.

[0016] Figure 2 It is a schematic diagram of the cross-sectional structure in the AA direction.

[0017] Figure 3 It is a schematic diagram of the cross-sectional structure in the BB direction.

[0018] Figure 4 It is a structural schematic diagram of a magnetically coupled lead screw nut.

[0019] Figure 5 It is a structural schematic diagram of a magnetically coupled sleeve.

[0020] Figure 6 It is a schematic cross-sectional view of the local structure of an embodiment of a lead screw nut with anti-backlash.

[0021] Figure 7 It is an appearance diagram of an embodiment using a hollow speed reduction mechanism. DETAILED DESCRIPTION

[0022] Hereinafter, the exemplary embodiments disclosed in this specification will be described in detail with reference to the accompanying drawings, but the same or similar elements are represented by the same reference numerals regardless of the reference numerals, and their redundant descriptions will be omitted. In addition, when describing the embodiments disclosed in this specification, when it is determined that the detailed description of the related known technology may obscure the key points of the embodiments disclosed in this specification, its detailed description will be omitted.

[0023] When a component is referred to as being "connected" or "connected" to another component, it can be understood that it can be directly connected or connected to another component, but other components may also exist in between. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

[0024] The present invention is further described below in conjunction with the accompanying drawings and specific implementation examples.

[0025] According to an implementation example of a magnetically coupled dual-motion combined motor of the present invention, Figure 1 , Figure 2 , Figure 3 As shown, it includes a linear drive motor 10, a rotary drive motor 20, a magnetic coupling lead screw nut 30 and a magnetic coupling sleeve 40.

[0026] The output shaft extending from the rotary drive motor 20 is a hollow shaft 21. The hollow shaft 21 adopts a seamless tube and is connected to the main shaft of the drive motor through a hollow shaft connector 23. The inner and outer surfaces of the hollow shaft 21 are provided with guide slides 22 that penetrate along the axial direction of the hollow shaft 21. In this embodiment, the guide slide 22 is a semicircular groove, and other suitable types of guide slides such as T-slots, plane guide rails, V-shaped guide rails, etc. can also be used.

[0027] A sealing end cover 24 is provided at the top of the hollow shaft 21 to isolate the influence of the external environment on the internal motion mechanism of the hollow shaft 21 . A screw bearing 25 coaxial with the hollow shaft 21 is provided in the sealing end cover 24 to support the top of the screw shaft 11 .

[0028] The output shaft extending from the linear drive motor 10 is the screw shaft 11, which is coaxially arranged in the hollow shaft 21. The magnetic coupling screw nut 30 consists of a screw nut 31 meshing with the screw shaft 11 and a nut magnetic coupling body 32, and is accommodated between the screw shaft 11 and the hollow shaft 21.

[0029] The magnetic coupling lead screw nut 30 is provided with a nut guide portion 33 that cooperates with the guide slideway 22 . The nut guide portion 33 is used to prevent the magnetic coupling lead screw nut 30 from rotating relative to the hollow shaft 21 .

[0030] The magnetic coupling sleeve 40 is arranged on the outer surface of the hollow shaft 21. The magnetic coupling sleeve 40 is provided with a sleeve coupling magnet 42 that cooperates with the nut magnetic coupling body 32. The magnetic pole on the inner surface of the sleeve magnetic coupling body 42 is different from the magnetic pole on the outer surface of the nut magnetic coupling body 32. The magnetic coupling sleeve 40 relies on the magnetic attraction between itself and the magnetic coupling screw nut 30 to move synchronously with the magnetic coupling screw nut 30 along the axial direction of the hollow shaft 20.

[0031] The magnetic coupling sleeve 40 is provided with a sleeve guide portion 43 that cooperates with the guide slideway 22 . The sleeve guide portion 43 is used to prevent the magnetic coupling sleeve 40 from rotating relative to the hollow shaft 20 .

[0032] The structure of the magnetic coupling lead screw nut 30 and the magnetic coupling sleeve 40 is as follows: Figure 4 , Figure 5 As shown, the magnetically coupled screw nut 30 is composed of a screw nut 31 and a nut magnetic coupling body 32, and the nut guide portion 33 is arranged on the outer edge of the magnetically coupled screw nut 30; the nut magnetic coupling body 32 adopts no less than one nut permanent magnet ring 34 and a nut magnetic conductive ring 35, and the nut permanent magnet ring 34 and the nut magnetic conductive ring 35 are stacked at intervals and coaxially fixedly connected with the screw nut 31.

[0033] The magnetic coupling sleeve 40 is composed of a sleeve housing 41, a sleeve coupling magnet 42 and a sleeve guide portion 43. The sleeve coupling magnet 42 is fixedly installed in the sleeve housing 41, and the sleeve guide portion 43 is fixed to the inner edge of the sleeve coupling magnet 42. The sleeve coupling magnet 42 adopts no less than one sleeve permanent magnet ring 44 and sleeve magnetic conductive ring 45. The sleeve permanent magnet ring 44 and the sleeve magnetic conductive ring 45 are stacked at intervals and coaxially fixedly connected.

[0034] In order to improve the accurate positioning of the mutual attraction between the magnetic coupling screw nut 30 and the magnetic coupling sleeve 40, a nut magnetic tooth groove 36 can be provided on the outer edge of the nut magnetic ring 35, and a sleeve magnetic tooth groove 46 can be provided on the inner edge of the sleeve magnetic ring 45. In the assembled magnetic coupling dual-motion combination motor, the positions of the nut magnetic tooth groove 36 and the magnetic tooth groove 46 correspond to each other. By utilizing the magnetic positioning effect between the magnetic tooth grooves, only one of the nut guide part 33 or the sleeve guide part 43 is provided. The same effect can be achieved that the magnetic coupling sleeve 40 relies on the magnetic attraction force between the magnetic coupling screw nut 30 and moves synchronously with the magnetic coupling screw nut 30 along the axial direction of the hollow shaft.

[0035] In order to eliminate the influence of the gap between the lead screw nut and the lead screw thread and improve the stability and accuracy of the transmission mechanism, the magnetic coupling lead screw nut 30 can adopt a gap elimination lead screw nut structure. Figure 6It is a schematic cross-sectional diagram of the local structure of an embodiment of a backlash-eliminating lead screw nut. The backlash-eliminating lead screw nut structure is a structure in which a secondary lead screw nut 37 and a tension spring 38 are added to the magnetically coupled lead screw nut 30; the secondary lead screw nut 37 is meshed with the lead screw shaft 11, and is coaxially accommodated with the magnetically coupled lead screw nut 30 between the lead screw shaft 11 and the hollow shaft 21; a secondary nut guide portion 39 cooperating with the guide slide 22 is provided on the outer edge of the secondary lead screw nut 37, for preventing the secondary lead screw nut 37 from rotating relative to the hollow shaft 20; the tension spring 38 is provided between the magnetically coupled lead screw nut 30 and the secondary lead screw nut 37, and the magnetically coupled lead screw nut 30 and the secondary lead screw nut 37 are caused to deviate from each other by the force of compressing the tension spring 38, thereby eliminating the backlash.

[0036] According to another embodiment of the present invention, Figure 7 As shown, the magnetically coupled dual-motion combination motor includes a linear drive motor 10 , a rotary drive motor 20 , a magnetically coupled lead screw nut (not shown) and a magnetically coupled sleeve 40 .

[0037] The output shaft extending from the rotary drive motor 20 is a hollow shaft 21, which is connected to the internal main shaft of the rotary drive motor 50 through a hollow reduction mechanism 50. The inner and outer surfaces of the hollow shaft 21 are provided with guide slideways 22 that penetrate the axial direction of the hollow shaft 21. The hollow reduction mechanism 50 can adopt a suitable reduction mechanism such as synchronous belt reduction, planetary reduction, harmonic reduction, etc. The use of a reduction mechanism to drive can improve the rotation control accuracy and load capacity of the hollow shaft 21.

[0038] The output shaft extending from the linear drive motor 10 is a screw shaft (not shown), which is coaxially arranged in the hollow shaft 21, and a magnetic coupling screw nut (not shown) is accommodated between the screw shaft and the hollow shaft 21, and a magnetic coupling sleeve 40 is arranged on the outer surface of the hollow shaft 21.

[0039] The rotary drive motor 20 and the linear drive motor 10 may be provided with a rotary encoder 60 for closed-loop control of the drive motor.

[0040] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A magnetic coupling dual-motion combination motor, comprising at least a rotary drive motor, a linear drive motor, a magnetic coupling lead screw nut and a magnetic coupling sleeve; the output shaft extending from the rotary drive motor is a hollow shaft, the hollow shaft adopts a seamless tube and is provided with a guide slideway penetrating along the axial direction; the output shaft extending from the linear drive motor is a lead screw shaft, and the lead screw shaft is coaxially arranged in the hollow shaft; the magnetic coupling lead screw nut is composed of a lead screw nut meshing with the lead screw shaft and a nut magnetic coupling body, and is accommodated between the lead screw shaft and the hollow shaft; a nut guide part cooperating with the guide slideway is provided on the magnetic coupling lead screw nut, and the nut guide part is used to prevent the magnetic coupling lead screw nut from rotating relative to the hollow shaft; the magnetic coupling sleeve is arranged on the outer surface of the hollow shaft, the magnetic coupling sleeve is provided with a sleeve coupling magnet cooperating with the nut magnetic coupling body, the magnetic pole on the inner surface of the sleeve magnetic coupling body is different from the magnetic pole on the outer surface of the nut magnetic coupling body, and the magnetic coupling sleeve relies on the magnetic attraction between the magnetic coupling lead screw nut and the magnetic coupling lead screw nut to move synchronously along the axial direction of the hollow shaft with the magnetic coupling lead screw nut.

2. The magnetically coupled dual-motion combined motor according to claim 1, characterized in that: The magnetic coupling sleeve is provided with a sleeve guide portion matched with the guide slideway, and the sleeve guide portion is used to prevent the magnetic coupling sleeve from rotating relative to the hollow shaft.

3. The magnetically coupled dual-motion combined motor according to claim 1, characterized in that: The nut magnetic coupling body adopts no less than one nut permanent magnetic ring and one nut magnetic conductive ring, and the nut permanent magnetic ring and the nut magnetic conductive ring are arranged in an interval and stacked manner and are coaxially fixedly connected with the lead screw nut.

4. The magnetically coupled dual-motion combined motor according to claim 1, characterized in that: The sleeve coupling magnet adopts at least one sleeve permanent magnet ring and a sleeve magnetic conductive ring. The sleeve permanent magnet ring and the sleeve magnetic conductive ring are stacked at intervals and coaxial with the hollow shaft.

5. The magnetically coupled dual-motion combined motor according to claim 3, characterized in that: The outer edge of the nut magnetic conductive ring is provided with a nut magnetic conductive tooth groove.

6. The magnetically coupled dual-motion combined motor according to claim 4, characterized in that: The inner edge of the sliding sleeve magnetic conductive ring is provided with sliding sleeve magnetic conductive tooth grooves.

7. The magnetically coupled dual-motion combined motor according to claim 1, characterized in that: The hollow shaft is connected to the rotating shaft of the rotary drive motor via a hollow reduction mechanism.

8. The magnetically coupled dual-motion combined motor according to claim 1, characterized in that: The lead screw nut comprises a backlash-eliminating lead screw nut.

9. The magnetically coupled dual-motion combined motor according to claim 1, characterized in that: The rotary drive motor and the linear drive motor are provided with a rotary encoder for closed-loop control of the drive motor.

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