An eccentric block device for an external rotor servo motor

Abstract

This utility model discloses an eccentric block device for an external rotor servo motor, relating to the field of motor technology. Specifically, it includes an eccentric block body and a connecting assembly. The top of the eccentric block body is provided with a mounting hole, and the connecting assembly is adapted to the mounting hole. The eccentric block body is connected to the shaft of the external rotor servo motor via the connecting assembly. The connecting assembly includes a fixing bolt threaded to the mounting hole. A cavity is provided in the middle of the fixing bolt, and a push rod is movably connected to the cavity. The push rod is connected to the fixing bolt via a first spring. Through holes are provided on both sides of the inner wall of the cavity, and a limit rod is movably connected within the through holes. The limit rod is connected to the fixing bolt via a second spring. This eccentric block device for an external rotor servo motor has the function of positioning the fixing bolt, preventing the fixing bolt from loosening under vibration, and improving the reliability of the connection between this application and the external rotor servo motor.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to an eccentric block device for an external rotor servo motor. Background Technology

[0002] An external rotor servo motor is a motor design where the rotor is located on the outside of the motor, while the stator is inside the rotor. In applications, an eccentric block device can be installed at the end of the rotor shaft. The centrifugal force generated by the high-speed rotation of the shaft and eccentric block is used to achieve specific functional requirements, such as vibration control, excitation force adjustment, or motion synchronization.

[0003] Currently, the connection between the eccentric block device and the shaft of the external rotor servo motor is usually achieved using bolts, as disclosed in the authorized patent document with application number CN202420110991.8. However, when using bolts, the bolts are prone to loosening under long-term vibration, affecting the reliability of the connection between the eccentric block device and the external rotor servo motor shaft. Furthermore, the shaft hole of the eccentric block device is prone to wear during use. Currently, users usually need to use tools such as micrometers to measure the shaft hole to determine the degree of wear, which is not intuitive. Based on this, this application proposes an eccentric block device for an external rotor servo motor. Utility Model Content

[0004] This utility model provides an eccentric block device for an external rotor servo motor, which solves the problems mentioned in the background art, such as the eccentric device being connected to the motor shaft by bolts, which is prone to loosening under long-term vibration, affecting the reliability of the connection; and the wear degree of the shaft hole of the eccentric device is not intuitive.

[0005] This utility model provides the following technical solution: an eccentric block device for an external rotor servo motor, comprising an eccentric block body and a connecting assembly. The top of the eccentric block body is provided with a mounting hole. The connecting assembly is adapted to the mounting hole. The eccentric block body is connected to the shaft of the external rotor servo motor via the connecting assembly. The connecting assembly includes a fixing bolt threaded to the mounting hole. A cavity is provided in the middle of the fixing bolt. A push rod is movably connected to the cavity. The push rod is connected to the fixing bolt via a first spring. Through holes are provided on both sides of the inner wall of the cavity. A limit rod is movably connected within the through holes. The limit rod is connected to the fixing bolt via a second spring. The limit rod is connected to the push rod via a pull rope. A limit hole adapted to the limit rod is provided on the inner wall of the mounting hole.

[0006] Preferably, a wear-resistant ring is provided on the inner wall of the shaft hole of the eccentric block body, the wear-resistant ring is detachably connected to the eccentric block body, and a number of positioning lines are provided at equal intervals on both sides of the wear-resistant ring.

[0007] Preferably, two adjacent positioning lines are marked with different symbols.

[0008] Preferably, a washer is provided between the fixing bolt and the eccentric block body, the through hole is provided in the smooth rod area of ​​the fixing bolt, and the limiting hole is provided in the smooth section of the mounting hole without threads.

[0009] Preferably, both the cavity and the push rod are I-shaped, and the end of the cavity forms a limiting surface, which forms an axial limiting fit with the end of the push rod.

[0010] Preferably, a guide wheel is provided on the side of the through hole away from the gasket, and the guide wheel is in contact with the side of the pull rope away from the gasket.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The eccentric block device of the external rotor servo motor has the function of positioning the fixing bolt, preventing the fixing bolt from loosening in a vibration environment and improving the reliability of the connection between the present application and the external rotor servo motor; and through the structural design of the connecting component, the push rod is squeezed during the tightening of the fixing bolt, preventing the limit rod from affecting the tightening of the fixing bolt. After the fixing bolt is tightened, the restriction on the push rod is released, and the limit rod can be automatically inserted into the limit hole to realize the limit of the fixing bolt without additional operation, thus improving the convenience of use.

[0013] 2. The eccentric block device of the external rotor servo motor can quickly identify the area and degree of wear of the wear-resistant ring by the blurring or missing positioning lines. This allows users to intuitively judge the wear degree of the eccentric block device, which facilitates timely maintenance of the eccentric block device and reduces the probability of malfunction or downtime of the external rotor servo motor. Attached Figure Description

[0014] Figure 1 This is a front view of the structure of this utility model;

[0015] Figure 2 This is a schematic cross-sectional view of the structure of this utility model;

[0016] Figure 3 The structure of this utility model Figure 2 Explosion diagram;

[0017] Figure 4 This is a cross-sectional schematic diagram of the structural connection component of this utility model;

[0018] Figure 5 The structure of this utility model Figure 1 Enlarged diagram of A in the middle.

[0019] In the diagram: 1. Eccentric block body; 2. Wear-resistant ring; 3. Connecting assembly; 4. Positioning line; 5. Mounting hole; 6. Limiting hole; 7. Gasket; 8. Fixing bolt; 9. Limiting rod; 10. Push rod; 11. Pull rope; 12. Second spring; 13. First spring; 14. Guide wheel; 15. Cavity; 16. Through hole. Detailed Implementation

[0020] 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.

[0021] This utility model provides an embodiment: Please refer to Figures 1-5 An eccentric block device for an external rotor servo motor includes an eccentric block body 1 and a connecting assembly 3. The top of the eccentric block body 1 has a mounting hole 5. The connecting assembly 3 is adapted to the mounting hole 5. The eccentric block body 1 is connected to the shaft of the external rotor servo motor via the connecting assembly 3. The connecting assembly 3 includes a fixing bolt 8 threadedly connected to the mounting hole 5. The fixing bolt 8 enables the connection between the eccentric block body 1 and the shaft of the external rotor servo motor. A washer 7 is provided between the fixing bolt 8 and the eccentric block body 1. The nut of the fixing bolt 8 has a drive groove for tightening or loosening with a tool. During the tightening process, the drive end of the tool is inserted into the drive groove.

[0022] To prevent the fixing bolt 8 from loosening under vibration, this application provides an I-shaped cavity 15 in the middle of the fixing bolt 8. The cavity 15 is movably connected to a push rod 10. The push rod 10 is I-shaped, and the end of the cavity 15 forms a limiting surface, which forms an axial limiting fit with the end of the push rod 10, thereby achieving precise control of the movement stroke of the push rod 10. Furthermore, there is damping between the push rod 10 and the cavity 15, which releases the restriction on the push rod 10, allowing the position of the push rod 10 to remain unchanged.

[0023] Push rod 10 is connected to fixing bolt 8 via first spring 13, such as Figure 4 As shown, when the restriction on push rod 10 is released, under the action of the rebound force of the first spring 13, the right end of push rod 10 is tightly fitted with the right end of cavity 15, and the left end of push rod 10 is separated from the left end of cavity 15. Furthermore, the left end of cavity 15 can limit the left end of push rod 10, allowing push rod 10 to move only in a straight line in the direction of cavity 15. Under external pressure, the left end of push rod 10 can contact the left end of cavity 15, enabling the push rod 10 to move within cavity 15.

[0024] Both sides of the inner wall of cavity 15 are provided with through holes 16. A limiting rod 9 is movably connected in the through holes 16. The limiting rod 9 is connected to the fixing bolt 8 through a second spring 12. Under the action of the second spring 12, the end of the limiting rod 9 away from the push rod 10 can extend to the outside of the fixing bolt 8. The limiting rod 9 is connected to the push rod 10 through a pull rope 11. The inner wall of the mounting hole 5 is provided with a limiting hole 6 that matches the limiting rod 9. When the eccentric block body 1 is connected to the shaft of the outer rotor servo motor, the limiting hole 6 and the through hole 16 are aligned. Under the action of the rebound force of the second spring 12, the end of the limiting rod 9 away from the push rod 10 is inserted into the limiting hole 6, thereby limiting the fixing bolt 8 and preventing the fixing bolt 8 from loosening.

[0025] Through hole 16 is located in the smooth section of fixing bolt 8, and limiting hole 6 is located in the smooth section of mounting hole 5 without threads, such as... Figure 3 As shown, this configuration avoids the through hole 16 and the limiting hole 6 from affecting the threaded connection between the fixing bolt 8 and the mounting hole 5.

[0026] like Figure 4 As shown, a guide wheel 14 is provided on the side of the through hole 16 away from the gasket 7. The guide wheel 14 contacts the side of the pull rope 11 away from the gasket 7. Through the setting of the guide wheel 14, the guide wheel 14 can guide the direction of the pull rope 11, so that when the push rod 10 drives the pull rope 11 to move under the pressure of external force, the two ends of the pull rope 11 can form a right angle, which makes it easy for the pull rope 11 to drive the limit rod 9 to move. When the left end of the push rod 10 is tightly fitted with the left end of the cavity 15, the pull rope 11 drives the limit rod 9 to move into the through hole 16, so as to avoid the limit rod 9 affecting the threaded connection between the fixing bolt 8 and the mounting hole 5.

[0027] A wear-resistant ring 2 is provided on the inner wall of the shaft hole of the eccentric block body 1. The wear-resistant ring 2 is detachably connected to the eccentric block body 1. By replacing the wear-resistant ring 2 during use, the eccentric block body 1 can be reused, saving resources. The material of the wear-resistant ring 2 and its connection method with the eccentric block body 1 can be set according to requirements and are not limited here. Several positioning lines 4 are equidistantly arranged on both sides of the wear-resistant ring 2. Adjacent positioning lines 4 are marked with different symbols, which can be set according to requirements and are not limited here. Through the positioning lines 4, users can quickly identify the wear area and degree by observing the blurriness or absence of the symbols, allowing users to intuitively judge the wear degree of the eccentric block device, facilitating timely maintenance of the eccentric block device, and reducing the probability of malfunction or downtime of the external rotor servo motor.

[0028] In summary: When installing the eccentric block device of the external rotor servo motor, the user places the eccentric block body 1 on the appropriate position of the external rotor servo motor shaft, connects the fixing bolt 8 to the mounting hole 5 with threads, inserts the tool for tightening the fixing bolt 8 into the drive groove provided at the nut of the fixing bolt 8, and the tool presses the push rod 10 until the end of the push rod 10 near the washer 7 is tightly fitted with the cavity 15. When the push rod 10 moves, it drives the limit rod 9 to move through the pull rope 11. Under the action of the pull rope 11, the limit rod 9 moves into the through hole 16, and the user tightens the fixing bolt 8. 8 can be threaded into the mounting hole 5. After the eccentric block body 1 is connected to the shaft of the external rotor servo motor, the user separates the tool for tightening the fixing bolt 8 from the fixing bolt 8. At this time, the through hole 16 and the limiting hole 6 are aligned. After the tool is separated from the fixing bolt 8, the push rod 10 is reset under the action of the rebound force of the first spring 13. During the reset process of the push rod 10, the rebound force of the second spring 12 pushes the limiting rod 9 to move outward until the limiting rod 9 is inserted into the limiting hole 6. The limiting rod 9 is used to limit the fixing bolt 8 and prevent the fixing bolt 8 from loosening in the vibration environment.

[0029] During use, users can quickly identify the wear area and degree by observing the blurring or missing positioning line 4. This allows users to intuitively judge the wear degree of the eccentric block device, which facilitates timely maintenance of the eccentric block device and reduces the probability of malfunction or downtime of the external rotor servo motor.

[0030] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each structure adopt conventional technical means such as bolt connection that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The materials of each component can be selected according to the requirements and are not limited here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art. Although the embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. An eccentric block device for an external rotor servo motor, comprising an eccentric block body (1) and a connecting assembly (3), characterized in that: The top of the eccentric block body (1) is provided with a mounting hole (5). The connecting component (3) is adapted to the mounting hole (5). The eccentric block body (1) is connected to the shaft of the external rotor servo motor through the connecting component (3). The connecting component (3) includes a fixing bolt (8) that is threaded to the mounting hole (5). A cavity (15) is provided in the middle of the fixing bolt (8). A push rod (10) is movably connected to the cavity (15). The push rod (10) is connected to the fixing bolt (8) through a first spring (13). Both sides of the inner wall of the cavity (15) are provided with through holes (16). A limit rod (9) is movably connected in the through hole (16). The limit rod (9) is connected to the fixing bolt (8) through a second spring (12). The limit rod (9) is connected to the push rod (10) through a pull rope (11). The inner wall of the mounting hole (5) is provided with a limit hole (6) that is adapted to the limit rod (9).

2. The eccentric block device for an external rotor servo motor according to claim 1, characterized in that: The inner wall of the shaft hole of the eccentric block body (1) is provided with a wear-resistant ring (2). The wear-resistant ring (2) is detachably connected to the eccentric block body (1). Several positioning lines (4) are provided at equal intervals on both sides of the wear-resistant ring (2).

3. The eccentric block device for an external rotor servo motor according to claim 2, characterized in that: Two adjacent positioning lines (4) are marked with different symbols.

4. The eccentric block device for an external rotor servo motor according to claim 1, characterized in that: A washer (7) is provided between the fixing bolt (8) and the eccentric block body (1), the through hole (16) is provided in the smooth rod area of ​​the fixing bolt (8), and the limiting hole (6) is provided in the smooth section of the mounting hole (5) without threads.

5. The eccentric block device for an external rotor servo motor according to claim 1, characterized in that: Both the cavity (15) and the push rod (10) are I-shaped. The end of the cavity (15) forms a limiting surface, which forms an axial limiting fit with the end of the push rod (10).

6. The eccentric block device for an external rotor servo motor according to claim 4, characterized in that: A guide wheel (14) is provided on the side of the through hole (16) away from the gasket (7), and the guide wheel (14) contacts the side of the pull rope (11) away from the gasket (7).

Images