Motor

Abstract

The utility model provides a motor, which comprises a motor body, and the motor body comprises a casing and a rotating shaft. The inertia disc assembly comprises an inertia disc body and an inertia disc split body which can be mutually adsorbed or separated, the inertia disc body is arranged on the rotating shaft in a sleeving mode, and the inertia disc split body is located on the side, away from the rotating shaft, of the peripheral face of the inertia disc body; and the adjusting device is movably arranged on the shell so as to be adsorbed or separated from the inertia disc split body, so that the inertia disc split body is separated or adsorbed from the inertia disc body, and the problem that the inertia disc in the prior art cannot meet the requirements of the motor under various working conditions is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a motor. Background Art

[0002] A servo motor is an engine that controls the operation of mechanical components in a servo system. It is an auxiliary motor indirect speed change device. The servo motor can control speed and position accuracy very accurately. It can convert voltage signals into torque and speed to drive the controlled object. The rotor speed of the servo motor is controlled by the input signal and can respond quickly.

[0003] In servo motor applications, an inertia disk is generally used to provide the servo motor with higher inertia to meet different application requirements. However, the inertia of a motor equipped with an inertia disk is too large and the inertia cannot be changed, resulting in poor versatility. In addition, the inertia disk cannot be removed or the type cannot be changed, which cannot meet the needs of the motor under various working conditions. Utility Model Content

[0004] The main purpose of the utility model is to provide a motor to solve the problem that the inertia disk in the prior art cannot meet the requirements of the motor under various working conditions.

[0005] To achieve the above objectives, according to one aspect of the present invention, a motor is provided, comprising a motor body, the motor body comprising a housing and a rotating shaft; an inertia disc assembly, the inertia disc assembly comprising an inertia disc body and an inertia disc split that can be attracted to or separated from each other, the inertia disc body being sleeved on the rotating shaft, the inertia disc split being located on a side of the outer circumference of the inertia disc body away from the rotating shaft; and an adjustment device movably disposed on the housing to be attracted to or separated from the inertia disc split, thereby separating the inertia disc split from or attracting the inertia disc body.

[0006] Furthermore, the adjustment device includes a magnetic rod, which is rotatably arranged on the housing and movably arranged in a direction close to or away from the inertia disk body, and the magnetic rod and the inertia disk split are arranged correspondingly; when the inertia disk body and the inertia disk split are in an adsorption state, the magnetic rod is rotated to move the magnetic rod in a direction close to the inertia disk split, so that the magnetic rod and the inertia disk split are adsorbed, and the inertia disk split is separated from the inertia disk body.

[0007] Furthermore, the adjusting device includes a push rod, which is slidably provided on the magnetic rod along the extension direction of the magnetic rod; when the magnetic rod and the inertia disk split are in an adsorption state, the push rod is pushed in a direction close to the inertia disk body to separate the magnetic rod and adsorb the inertia disk split to the inertia disk body.

[0008] Furthermore, the motor also includes a mounting plate, which is arranged on the outside of the casing and has a threaded hole; an external thread is provided on the outer surface of the magnetic rod, and the magnetic rod is inserted into the threaded hole and is threadedly connected to the threaded hole through the external thread.

[0009] Furthermore, a through hole is provided in the magnetic rod, and the through hole is provided along the extension direction of the magnetic rod; the push rod includes a main rod body and a limiting end provided at one end of the main rod body away from the inertia disk assembly, and the main rod body can be slidably passed through the through hole.

[0010] Furthermore, the adjusting device also includes an elastic member, which is sleeved on the main rod body and located between the limit end and the casing.

[0011] Furthermore, the adjustment device also includes a rocker, which is arranged at one end of the magnetic rod away from the inertia disk assembly, and the magnetic rod is driven to rotate by rotating the rocker.

[0012] Furthermore, there are multiple inertia disc bodies, which are sequentially sleeved on the rotating shaft along the center line of the rotating shaft; the inertia disc assembly includes multiple split assemblies, which are arranged in a one-to-one correspondence with the multiple inertia disc bodies, and each split assembly includes at least one inertia disc split; the motor includes multiple adjustment assemblies, which are arranged in a one-to-one correspondence with the multiple split assemblies, and each adjustment assembly includes at least one adjustment device.

[0013] Furthermore, there is one inertia disc body and multiple inertia disc splits, which are arranged at intervals around the outer circumference of the inertia disc body; there are multiple adjustment devices, which are arranged in a one-to-one correspondence with the multiple inertia disc splits.

[0014] Furthermore, the magnetic rod, the inertia disk split and the inertia disk body are all magnetic parts; or a magnetic contact portion is provided at one end of the magnetic rod close to the inertia disk split, the inertia disk split is a magnetic block, and a magnetic layer is coated on the outer circumferential surface of the inertia disk body; wherein the magnetic force of the magnetic rod is greater than the magnetic force of the inertia disk body.

[0015] The present invention employs the technical solution of a motor comprising a motor body, the motor body comprising a housing and a rotating shaft; an inertia disc assembly, the inertia disc assembly comprising an inertia disc body and an inertia disc split that can be attracted to or separated from each other, the inertia disc body being sleeved on the rotating shaft, the inertia disc split being located on a side of the outer circumference of the inertia disc body away from the rotating shaft; and an adjustment device movably disposed on the housing to attract to or separate from the inertia disc split, thereby separating or attracting the inertia disc split from the inertia disc body. Thus, the present invention disposes an inertia disc assembly within the motor, divides the inertia disc assembly into the inertia disc body and the inertia disc split, and mounts the adjustment device on the motor housing. By moving the adjustment device, the inertia disc split and the inertia disc body are attracted to or separated from each other, thereby changing the mass of the portion of the inertia disc assembly located on the rotating shaft to change the inertia of the motor, thereby adapting the motor to a wider range of applications. This effectively addresses the problem of inertia discs in the prior art failing to meet the requirements of motors under various operating conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic diagram of the overall structure of the inertia disc main body and the inertia disc split body of the motor according to an embodiment of the present utility model in an adsorption state is shown;

[0018] Figure 2 Shown Figure 1 The schematic diagram of the overall structure of the motor's inertia disk split and magnetic rod in an adsorption state is shown;

[0019] Figure 3 Shown Figure 2 A partial enlarged view of the inertia disc assembly and the adjustment device of the motor shown;

[0020] Figure 4 Shown Figure 1 A partial enlarged view of the inertia disc assembly and the adjustment device of the motor shown;

[0021] Figure 5 Shown Figure 1 A side view of the motor's inertia disc body and split inertia disc in an adsorbed state is shown;

[0022] The above drawings include the following reference numerals:

[0023] 10. Motor body; 20. Inertia disk assembly; 30. Adjustment device; 40. Mounting plate; 50. Adjustment assembly;

[0024] 101. housing; 102. shaft;

[0025] 201. Inertia disc body; 202. Inertia disc split;

[0026] 301, magnetic rod; 302, push rod; 303, rocker;

[0027] 401, threaded hole;

[0028] 3011, through hole;

[0029] 3021, main rod body; 3022, limit end. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] like Figures 1 to 5 As shown, the motor of the present invention includes a motor body 10, which includes a housing 101 and a rotating shaft 102; an inertia disc assembly 20, which includes an inertia disc body 201 and an inertia disc split body 202 that can be attracted to or separated from each other, the inertia disc body 201 being sleeved on the rotating shaft 102, and the inertia disc split body 202 being located on a side of the outer circumference of the inertia disc body 201 away from the rotating shaft 102; and an adjusting device 30, which is movably provided on the housing 101 to be attracted to or separated from the inertia disc split body 202, so as to separate or attract the inertia disc split body 202 from the inertia disc body 201. Thus, the present invention disposes an inertia disc assembly 20 inside the motor, divides the inertia disc assembly 20 into an inertia disc main body 201 and an inertia disc split body 202, and mounts the adjustment device 30 on the motor housing 101. By moving the adjustment device 30, the inertia disc split body 202 and the inertia disc main body 201 are attracted to or separated from each other, thereby changing the mass of the portion of the inertia disc assembly 20 located on the rotating shaft 102 to change the inertia of the motor, making the motor adaptable to more applications. This effectively solves the problem in the prior art that the inertia disc cannot meet the needs of the motor under various operating conditions.

[0032] like Figure 2 and Figure 3As shown, the adjustment device 30 includes a magnetic rod 301, which is rotatably disposed on the housing 101 and is movable in a direction close to or away from the inertia disk body 201. The magnetic rod 301 is disposed corresponding to the inertia disk split 202. When the inertia disk body 201 and the inertia disk split 202 are in an adsorption state, the magnetic rod 301 is rotated to move the magnetic rod 301 in a direction close to the inertia disk split 202, so that the magnetic rod 301 and the inertia disk split 202 are adsorbed, and the inertia disk split 202 is separated from the inertia disk body 201.

[0033] Specifically, the adjustment device 30 includes a push rod 302, which is slidably provided on the magnetic rod 301 along the extension direction of the magnetic rod 301; when the magnetic rod 301 and the inertia disk split 202 are in an adsorption state, the push rod 302 is pushed in a direction close to the inertia disk body 201 to separate the magnetic rod 301 and the inertia disk split 202, and the inertia disk split 202 and the inertia disk body 201 are adsorbed.

[0034] The push rod 302 is made of non-magnetic material.

[0035] like Figure 3 As shown, the motor also includes a mounting plate 40, which is arranged on the outside of the housing 101 and has a threaded hole 401; an external thread is provided on the outer surface of the magnetic rod 301, and the magnetic rod 301 is passed through the threaded hole 401 and is threadedly connected to the threaded hole 401 through the external thread.

[0036] In this way, by arranging a mounting plate 40 on the outer peripheral surface of the casing 101 and arranging a threaded hole 401 on the mounting plate 40, the problem that the casing 101 is thin and inconvenient for thread processing is solved, the damage to the casing 101 is reduced, the structural strength of the casing 101 is ensured, and the stability of the movement of the magnetic rod 301 is ensured.

[0037] like Figure 4 As shown, a through hole 3011 is provided in the magnetic rod 301, and the through hole 3011 is provided along the extension direction of the magnetic rod 301; the push rod 302 includes a main rod body 3021 and a limiting end 3022 provided at one end of the main rod body 3021 away from the inertia disk assembly 20, and the main rod body 3021 can be slidably passed through the through hole 3011.

[0038] Specifically, the adjusting device 30 further includes an elastic member (not shown in the figure), which is sleeved on the main rod body 3021 and located between the limiting end 3022 and the housing 101 .

[0039] In this way, after the push rod 302 moves in a direction close to the inertia disk split body 202 , the elastic member can generate an elastic force on the push rod 302 in a direction away from the inertia disk split body 202 , so that the push rod 302 is automatically reset.

[0040] Preferably, the elastic member is a compression spring, which is sleeved on the main rod body 3021 and located between the limiting end 3022 and the mounting plate 40 .

[0041] like Figure 4 As shown, the adjustment device 30 further includes a rocker 303 , which is disposed at one end of the magnetic rod 301 away from the inertia disk assembly 20 , and the magnetic rod 301 is driven to rotate by rotating the rocker 303 .

[0042] Optionally, the rocker 303 of the present invention is a hand rocker, which includes a hand-grip rod body perpendicular to the magnetic rod 301 , one end of the hand-grip rod body is connected to the magnetic rod 301 , and the other end of the hand-grip rod body extends in a direction away from the magnetic rod 301 .

[0043] Specifically, the present invention provides a rocker 303 and controls the mass of the portion of the inertia disk located on the rotating shaft 102 by manually shaking the rocker 303, thereby providing the motor with appropriate inertia under different working conditions.

[0044] In at least one embodiment of the present invention, there are multiple inertia disc bodies 201, which are sequentially sleeved on the rotating shaft 102 along the center line of the rotating shaft 102. The inertia disc assembly 20 includes multiple split assemblies, which are arranged in a one-to-one correspondence with the multiple inertia disc bodies 201, and each split assembly includes at least one inertia disc split 202. The motor includes multiple adjustment assemblies 50, which are arranged in a one-to-one correspondence with the multiple split assemblies, and each adjustment assembly 50 includes at least one adjustment device 30.

[0045] In at least one embodiment of the present invention, there is one inertia disc body 201 and multiple inertia disc segments 202 , which are spaced apart and arranged around the outer circumference of the inertia disc body 201 . There are multiple adjustment devices 30 , which are arranged in a one-to-one correspondence with the multiple inertia disc segments 202 .

[0046] In the present utility model Figures 1 to 5In the illustrated embodiment, there are three inertia disc bodies 201, which are sequentially sleeved on the rotating shaft 102 along the centerline of the rotating shaft 102. The inertia disc assembly 20 includes two split assemblies, which are provided in a one-to-one correspondence with the two inertia disc bodies 201. Each split assembly includes four inertia disc segments 202. The motor includes four adjustment assemblies 50, which are provided in a one-to-one correspondence with the four inertia disc bodies 201. Each adjustment assembly 50 includes four adjustment devices 30.

[0047] Optionally, the magnetic rod 301, the inertia disk split 202 and the inertia disk body 201 are all magnetic parts; or a magnetic contact portion is provided at one end of the magnetic rod 301 close to the inertia disk split 202, the inertia disk split 202 is a magnetic block, and a magnetic layer is coated on the outer circumference of the inertia disk body 201; wherein the magnetic force of the magnetic rod 301 is greater than the magnetic force of the inertia disk body 201.

[0048] Specifically, when the inertia disk body 201 and the inertia disk split body 202 are in an adsorption state, the magnetic rod 301 moves in a direction close to the inertia disk body 201 so that the magnetic rod 301 contacts the inertia disk split body 202 and is adsorbed thereto. Since the magnetic force of the magnetic rod 301 is greater than the magnetic force of the inertia disk body 201, the inertia disk split body 202 can be adsorbed away from the inertia disk body 201 when the magnetic rod 301 moves in a direction away from the inertia disk body 201.

[0049] like Figure 1 As shown, the rocker 303, the magnetic rod 301 and the push rod 302 are all in a stationary state at this time. Each inertia disk segment 202 is adsorbed on the corresponding inertia disk body 201 and is not in contact with the adjustment device. The part of the inertia disk assembly 20 located on the rotating shaft 102 has the highest inertia. At this time, the operation of the motor will not interfere with the adjustment device 30.

[0050] like Figure 3 As shown, each inertia disk split 202 is adsorbed on the corresponding magnetic rod 301 and separated from the corresponding inertia disk body 201. The portion of the inertia disk assembly 20 located on the rotating shaft 102 has the lowest inertia. At this time, the operation of the motor will not interfere with the inertia disk split 202 and the adjustment device 30.

[0051] The adjustment process of the inertia of the motor of the present invention is as follows:

[0052] like Figure 1 and Figure 4As shown, when the motor is in a stationary state and the inertia disc body 201 and the inertia disc split body 202 are in an adsorption state, first, the rocker 303 is rotated forward to move the magnetic rod 301 toward the inertia disc body 201 to be adsorbed by the inertia disc split body 202; then, the rocker 303 is rotated backward to move the magnetic rod 301 away from the inertia disc body 201 to separate the inertia disc body 201 and the inertia disc split body 202, thereby reducing the inertia value of the portion of the inertia disc assembly 20 located on the rotating shaft 102.

[0053] like Figure 2 and Figure 3 As shown, when the inertia disk split 202 needs to be moved from the magnetic rod 301 to the inertia disk body 201, first, the rocker 303 is rotated forward to allow the magnetic rod 301 to move the inertia disk split 202 to a position close to the inertia disk body 201. At this time, there is a magnetic attraction between the inertia disk split 202 and the inertia disk body 201. Then, the non-magnetic push rod 302 is pushed in a direction close to the inertia disk body 201 to separate the inertia disk split 202 from the magnetic rod 301. At this time, the inertia disk split 202 is attracted by the inertia disk body 201. Finally, the rocker 303 is rotated backward to reset the magnetic rod 301.

[0054] Specifically, the adjustment component 50 of the present invention can perform stage-by-stage adjustments when the motor is in a stationary state, so that the motor is always in an optimal operating state, thereby improving the versatility of the motor.

[0055] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0056] like Figures 1 to 5 As shown, the motor of the present invention includes a motor body 10, which includes a housing 101 and a rotating shaft 102; an inertia disc assembly 20, which includes an inertia disc body 201 and an inertia disc split body 202 that can be attracted to or separated from each other, the inertia disc body 201 being sleeved on the rotating shaft 102, and the inertia disc split body 202 being located on a side of the outer circumference of the inertia disc body 201 away from the rotating shaft 102; and an adjusting device 30, which is movably provided on the housing 101 to be attracted to or separated from the inertia disc split body 202, so as to separate or attract the inertia disc split body 202 from the inertia disc body 201.

[0057] It can be seen that the present invention provides an inertia disk assembly 20 inside the motor, divides the inertia disk assembly 20 into an inertia disk body 201 and an inertia disk split body 202, and mounts the adjustment device 30 on the motor housing 101. By moving the adjustment device 30, the inertia disk split body 202 and the inertia disk body 201 are attracted to or separated from each other, thereby changing the mass of the portion of the inertia disk assembly 20 located on the rotating shaft 102 to change the inertia of the motor, making the motor adaptable to more applications. This effectively solves the problem in the prior art that the inertia disk cannot meet the needs of the motor under various operating conditions.

[0058] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0059] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values should be interpreted as being merely exemplary, not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0060] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0061] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0062] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A motor, characterized in that: include: A motor body (10), the motor body (10) comprising a housing (101) and a rotating shaft (102); An inertia disc assembly (20), the inertia disc assembly (20) comprising an inertia disc body (201) and an inertia disc split body (202) that can be attracted to or separated from each other, the inertia disc body (201) being sleeved on the rotating shaft (102), and the inertia disc split body (202) being located on a side of the outer circumference of the inertia disc body (201) that is away from the rotating shaft (102); An adjusting device (30) is movably arranged on the housing (101) to be adsorbed or separated from the inertia disc split (202), so that the inertia disc split (202) is separated from or adsorbed to the inertia disc main body (201).

2. The motor according to claim 1, characterized in that The adjusting device (30) includes a magnetic rod (301), the magnetic rod (301) is rotatably arranged on the housing (101) and the magnetic rod (301) is movably arranged in a direction close to or away from the inertia disk body (201), and the magnetic rod (301) is correspondingly arranged with the inertia disk split body (202); When the inertia disc body (201) and the inertia disc split (202) are in an adsorption state, the magnetic rod (301) is rotated to move the magnetic rod (301) in a direction close to the inertia disc split (202), so that the magnetic rod (301) and the inertia disc split (202) are adsorbed, and the inertia disc split (202) is separated from the inertia disc body (201).

3. The motor according to claim 2, characterized in that The adjusting device (30) comprises a push rod (302), and the push rod (302) is slidably arranged on the magnetic rod (301) along the extension direction of the magnetic rod (301); When the magnetic rod (301) and the inertia disk split (202) are in an adsorption state, the push rod (302) is pushed in a direction close to the inertia disk body (201) to separate the magnetic rod (301) and the inertia disk split (202), and the inertia disk split (202) and the inertia disk body (201) are adsorbed.

4. The motor according to claim 2, characterized in that The motor further comprises a mounting plate (40), the mounting plate (40) being arranged on the outside of the housing (101), and a threaded hole (401) being provided on the mounting plate (40); An external thread is provided on the outer peripheral surface of the magnetic rod (301), and the magnetic rod (301) is inserted into the threaded hole (401) and is threadedly connected to the threaded hole (401) via the external thread.

5. The motor according to claim 3, characterized in that A through hole (3011) is provided in the magnetic rod (301), and the through hole (3011) is provided along the extension direction of the magnetic rod (301); The push rod (302) includes a main rod body (3021) and a limiting end (3022) arranged at one end of the main rod body (3021) away from the inertia disk assembly (20), and the main rod body (3021) is slidably arranged in the through hole (3011).

6. The motor according to claim 5, characterized in that The regulating device (30) further comprises an elastic member, which is sleeved on the main rod body (3021) and located between the limiting end (3022) and the housing (101).

7. The motor according to claim 2, characterized in that The adjusting device (30) further comprises a rocker (303), wherein the rocker (303) is arranged at one end of the magnetic rod (301) away from the inertia disk assembly (20), and the magnetic rod (301) is driven to rotate by rotating the rocker (303).

8. The motor according to claim 1, characterized in that There are multiple inertia disc bodies (201), and the multiple inertia disc bodies (201) are sequentially sleeved on the rotating shaft (102) along the center line of the rotating shaft (102); The inertia disc assembly (20) includes a plurality of split assemblies, the plurality of split assemblies are arranged in one-to-one correspondence with the plurality of inertia disc bodies (201), and each split assembly includes at least one inertia disc split (202); The motor comprises a plurality of adjustment components (50), the plurality of adjustment components (50) being arranged in a one-to-one correspondence with the plurality of split assemblies, and each of the adjustment components (50) comprises at least one of the adjustment devices (30).

9. The motor according to claim 1, characterized in that The number of the inertia disc main body (201) is one, the number of the inertia disc split bodies (202) is multiple, and the multiple inertia disc split bodies (202) are arranged at intervals around the outer circumference of the inertia disc main body (201); There are multiple adjusting devices (30), and the multiple adjusting devices (30) are arranged in a one-to-one correspondence with the multiple inertia disc splits (202).

10. The motor according to claim 2, characterized in that The magnetic rod (301), the inertia disc split (202) and the inertia disc body (201) are all magnetic parts; or One end of the magnetic rod (301) close to the inertia disk split (202) is provided with a magnetic contact portion, the inertia disk split (202) is a magnetic block, and the outer peripheral surface of the inertia disk body (201) is coated with a magnetic layer; The magnetic force of the magnetic attraction rod (301) is greater than the magnetic force of the inertia disk body (201).

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