Torque transmission protection mechanism and planer

Abstract

The utility model relates to a torque transmission protection mechanism and a planer, and the mechanism comprises a torque output gear which is provided with a first center line, and the middle of the torque output gear is provided with a containing space which extends along the axial direction of the first center line; the first magnetic ring is circumferentially positioned at the accommodating space along a first center line, the first magnetic ring is provided with a plurality of first N poles and a plurality of first S poles, and the first N poles and the first S poles are distributed in a staggered manner in the circumferential direction of the first center line; and the second magnetic ring is arranged opposite to the first magnetic ring in the axial direction of the first center line, the second magnetic ring is provided with a plurality of second N poles and second S poles, and the second N poles and the second S poles are arranged in a staggered mode in the circumferential direction of the first center line.

Description

Technical Field

[0001] The utility model relates to the field of planers, in particular to a torque transmission protection mechanism and a planer. Background Art

[0002] During the operation, the cutter used by the planer needs to rotate, and the rotation of the cutter is achieved through the torque transmitted by the motor. Every time the cutter needs to rotate, the motor outputs a pulse torque to the cutter. Due to the poor stability of the pulse signal, there is a large uncertainty in the speed and angle of each rotation of the cutter. When the pulse signal is large, the speed and angle of the cutter may be large, causing damage to the human body and low safety. Utility Model Content

[0003] Based on this, it is necessary to provide a torque transmission protection mechanism and a planer to address the problem of insufficient safety of the planer.

[0004] A torque transmission protection mechanism, comprising:

[0005] The torque output gear has a first center line, and a receiving space extending axially along the first center line is provided in the middle of the torque output gear;

[0006] A first magnetic ring is positioned at the accommodation space along the circumferential direction of the first center line, the first magnetic ring has a plurality of first N poles and a plurality of first S poles, and the first N poles and the first S poles are alternately arranged in the circumferential direction of the first center line; and

[0007] A second magnetic ring is arranged opposite to the first magnetic ring in the axial direction of the first center line, the second magnetic ring has a plurality of second N poles and second S poles, and the second N poles and the second S poles are arranged alternately in the circumferential direction of the first center line;

[0008] The torque transmission protection mechanism has a transmission state and a protection state;

[0009] When the torque transmission protection mechanism is in a transmission state, the first N pole is adsorbed on the second S pole, and the first S pole is adsorbed on the second N pole;

[0010] When the torque transmission protection mechanism is in the protection state, the first N pole and the second N pole are arranged opposite to each other and spaced apart in the axial direction of the first center line, and the first S pole and the second S pole are arranged opposite to each other and spaced apart in the axial direction of the first center line.

[0011] In the utility model, the second magnetic ring is at least partially located in the accommodating space. When the torque transmission protection mechanism is in the protection state, the second magnetic ring is rotatably arranged around the first center line in the accommodating space.

[0012] The torque transmission protection mechanism of the utility model also includes a rotating shaft, which is inserted between the first magnetic ring and the second magnetic ring. The second magnetic ring is positioned on the rotating shaft circumferentially along the first center line. The rotating shaft and the first magnetic ring are loosely matched to allow the first magnetic ring to rotate around the first center line on the rotating shaft.

[0013] The torque transmission protection mechanism of the utility model also includes an elastic member, which is located on the side of the second magnetic ring away from the first magnetic ring, and the two ends of the elastic member are respectively abutted against the second magnetic ring and the rotating shaft, and the second magnetic ring is axially movably arranged on the rotating shaft along the first center line.

[0014] The utility model provides a stopper on the rotating shaft, the stopper is located on the side of the first magnetic ring away from the second magnetic ring, and the torque output gear abuts against the stopper.

[0015] The rotating shaft of the utility model includes a connecting section, a circumferential positioning section and an axial positioning section in sequence along the axial direction of the first center line. A circumferential positioning hole is provided in the middle of the second magnetic ring. The circumferential positioning section is inserted in the circumferential positioning hole so that the second magnetic ring can obtain circumferential positioning on the circumferential positioning section and can slide on the circumferential positioning section. One end of the elastic member abuts against the connecting section, and the stop member is located on the axial positioning section. A supporting hole is provided in the middle of the first magnetic ring. The axial positioning section is inserted in the supporting hole and is gap-matched with the supporting hole.

[0016] In the utility model, the outer wall of the second magnetic ring and the inner wall of the accommodating space are clearance-matched.

[0017] In the utility model, one of the inner wall of the accommodation space and the outer wall of the first magnetic ring is provided with a positioning groove extending axially along the first center line, and the other is provided with a protrusion, which is slidably arranged in the positioning groove.

[0018] The positioning groove of the utility model is located at the inner wall of the accommodating space, one end of the positioning groove is located at the end of the torque output gear, and the other end of the positioning groove is located in the middle of the accommodating space.

[0019] A planer comprises a motor, a cutter and a torque transmission protection mechanism, wherein the motor is transmitted to the torque output gear, and the cutter is transmitted to the second magnetic ring.

[0020] The beneficial effects of the utility model are:

[0021] When the motor outputs a smaller torque to the torque output gear, the first magnetic ring and the second magnetic ring attract each other, and the torque output gear can transmit the torque to the second magnetic ring through the first magnetic ring, thereby driving the tool to rotate normally through the second magnetic ring.

[0022] When the motor outputs too much torque to the torque output gear, the first magnetic ring and the second magnetic ring rotate relative to each other and separate. The first magnetic ring cannot further transmit the torque to the second magnetic ring, thereby preventing the tool from rotating too quickly or at too large an angle, thereby improving the safety of the surgical procedure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The three-dimensional structure of the torque transmission protection mechanism in the embodiment of the utility model is shown in FIG. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the main structure of the torque transmission protection mechanism in the embodiment of the utility model;

[0025] Figure 3 The three-dimensional structure of the torque transmission protection mechanism in the embodiment of the utility model is shown in FIG. Figure 2 ;

[0026] Figure 4 It is a rear view structural schematic diagram of the torque transmission protection mechanism in the embodiment of the utility model;

[0027] Figure 5 This is a schematic diagram of the three-dimensional structure of the torque output gear in the embodiment of the utility model;

[0028] Figure 6 This is a schematic diagram of the main structure of the first magnetic ring in the embodiment of the utility model;

[0029] Figure 7 This is a schematic diagram of the three-dimensional structure of the first magnetic ring in the embodiment of the utility model;

[0030] Figure 8 This is a schematic diagram of the main structure of the second magnetic ring in the embodiment of the utility model;

[0031] Fig. 9 This is a schematic diagram of the three-dimensional structure of the second magnetic ring in the embodiment of the utility model;

[0032] Fig.10 This is a schematic diagram of the three-dimensional structure of the rotating shaft in the embodiment of the utility model;

[0033] Fig.11 Schematic diagram of the three-dimensional structure of the torque transmission protection mechanism in the embodiment of the utility model Figure 3 ;

[0034] Fig.12 Schematic diagram of the three-dimensional structure of the torque transmission protection mechanism in the embodiment of the utility model Figure 4 ;

[0035] Fig.13Side structural schematic diagrams of the torque transmission protection mechanism in other embodiments of the present invention.

[0036] Reference numerals:

[0037] 1. Torque output gear; 11. Accommodating space; 112. Positioning groove; 2. First magnetic ring; 21. First N pole; 22. First S pole; 23. Bump; 24. Support hole; 3. Second magnetic ring; 31. Second N pole; 32. Second S pole; 33. Circumferential positioning hole; 4. Rotating shaft; 41. Connecting section; 42. Circumferential positioning section; 43. Axial positioning section; 5. Stopper; 51. Retaining rib. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0044] Example:

[0045] The present embodiment provides a planer, including a shell, a motor, a cutter, and a torque transmission protection mechanism. The torque transmission protection mechanism has a transmission state and a protection state. When the torque output by the motor is small, the torque transmission protection mechanism is in the transmission state, and the motor can transmit a small torque to the cutter through the torque transmission protection mechanism, thereby controlling the rotation of the cutter. When the torque output by the motor is too large, the torque transmission protection mechanism switches to the protection state, and the motor cannot transmit the torque to the cutter through the torque transmission protection mechanism, or can only transmit a small amount of torque to the cutter through the torque transmission protection mechanism, thereby preventing the cutter from rotating at high speed or at a large angle, thereby protecting the human body. The motor and the torque transmission protection mechanism are both contained inside the shell, a part of the cutter is located inside the shell, and the other part is exposed outside the shell.

[0046] See also Figure 1-Figure 9The torque transmission protection mechanism includes a torque output gear 1, a first magnetic ring 2 and a second magnetic ring 3.

[0047] The torque output gear 1 has a first center line, and the motor is transmitted to the torque output gear 1. When the motor outputs a rotational torque, the rotational torque can always be transmitted to the torque output gear 1 to control the torque output gear 1 to rotate around the first center line. An accommodating space 11 extending axially along the first center line is provided in the middle of the torque output gear 1. The accommodating space 11 is a through hole in this embodiment. In other embodiments, the accommodating space 11 may also be a blind hole, a groove or a cavity.

[0048] The first magnetic ring 2 is at least partially located in the accommodation space 11, and the first magnetic ring 2 is circumferentially positioned at the accommodation space 11 along the first center line. Therefore, when the torque output gear 1 rotates around the first center line, the first magnetic ring 2 will always rotate synchronously with the torque output gear 1, that is, the torque output by the motor can always be transmitted to the first magnetic ring 2. This embodiment provides a way for the first magnetic ring 2 to obtain circumferential positioning, wherein the inner wall of the accommodation space 11 is provided with a positioning groove 112 extending axially along the first center line, and the outer wall of the first magnetic ring 2 is provided with a protrusion 23, and the protrusion 23 is axially slidably arranged in the positioning groove 112 along the first center line. In some other embodiments, the positions of the protrusion 23 and the positioning groove 112 can also be interchanged. The first magnetic ring 2 has a plurality of first N poles 21 and a plurality of first S poles 22, and the first N poles 21 and the first S poles 22 are alternately arranged in the circumferential direction of the first center line. For example, in this embodiment, the first magnetic ring 2 has two first N poles 21 and two first S poles 22, which are arranged in the order of the first N pole 21, the first S pole 22, the first N pole 21 and the first S pole 22 in the circumferential direction of the first center line.

[0049] The second magnetic ring 3 is arranged opposite to the first magnetic ring 2 in the axial direction of the first center line, and the second magnetic ring 3 has a plurality of second N poles 31 and second S poles 32, and the second N poles 31 and second S poles 32 are arranged alternately in the circumferential direction of the first center line. The number and size shape of the second N poles 31 and the second S poles 32 need to match the number and size of the first N poles 21 and the first S poles 22, so as to allow the first magnetic ring 2 and the second magnetic ring 3 to be dynamically matched, so as to allow the torque transmission protection mechanism to at least be able to switch from the transmission state to the protection state.

[0050] When the torque transmission protection mechanism is in the transmission state, the first N pole 21 is adsorbed on the second S pole 32, and the first S pole 22 is adsorbed on the second N pole 31. When the first magnetic ring 2 rotates with the torque output gear 1, the strong magnetic attraction between the second magnetic ring 3 and the first magnetic ring 2 causes the first magnetic ring 2 to generate a large friction force on the second magnetic ring 3, prompting the second magnetic ring 3 to rotate synchronously. Since the tool and the second magnetic ring 3 always maintain a transmission relationship, the torque output by the motor is smoothly transmitted to the tool through the first magnetic ring 2 and the second magnetic ring 3, so that the tool can rotate normally.

[0051] When the torque pulse output by the motor is too large, the torque output gear 1 and the first magnetic ring 2 will rotate at an extremely fast acceleration. At this time, the magnetic attraction between the first magnetic ring 2 and the second magnetic ring 3 is not enough to make the first magnetic ring 2 generate sufficient friction power on the second magnetic ring 3, and the rotation acceleration of the second magnetic ring 3 is also less than the rotation acceleration of the first magnetic ring 2, thereby causing relative rotation between the first magnetic ring 2 and the second magnetic ring 3, thereby the first N pole 21 gradually turns to the second N pole 31, and the first S pole 22 gradually turns to the second S pole 32. Correspondingly, the magnetic attraction between the first magnetic ring 2 and the second magnetic ring 3 is gradually converted into a magnetic repulsion, which eventually causes the first N pole 21 and the second N pole 31 to be arranged relative to and spaced apart in the axial direction of the first center line, and the first S pole 22 and the second S pole 32 to be arranged relative to and spaced apart in the axial direction of the first center line. At this time, the first magnetic ring 2 and the second magnetic ring 3 are separated from each other, and the torque transmission protection mechanism is switched from the transmission state to the protection state, and the first magnetic ring 2 loses the torque transmission effect on the second magnetic ring 3, thereby avoiding the second magnetic ring 3 from generating an excessively fast rotation speed, thereby achieving the effect of protecting the human body.

[0052] In addition, it is worth noting that when the torque transmission protection mechanism is in the protection state, as long as the first magnetic ring 2 and the second magnetic ring 3 remain axially relative to each other along the first center line, when the torque output gear 1 rotates again, the first N pole 21 can be redirected and adsorbed to the second S pole 32, and the first S pole 22 can be redirected and adsorbed to the second N pole 31, thereby enabling the torque transmission protection mechanism to switch from the protection state to the transmission state again.

[0053] When the torque transmission protection mechanism is in the transmission state, the second magnetic ring 3 is at least partially located in the accommodation space 11 to be adsorbed with the first magnetic ring 2. When the torque transmission protection mechanism is in the protection state, in order to keep the first magnetic ring 2 and the second magnetic ring 3 relative to each other in the axial direction of the first center line, so as to allow the torque transmission protection mechanism to switch from the protection state to the transmission state again, the accommodation space 11 needs to have a sufficient depth in the axial direction of the first center line, so as to limit the second magnetic ring 3 in the accommodation space 11, ensure that the second magnetic ring 3 is always at least partially located in the accommodation space 11, and avoid the second magnetic ring 3 and the first magnetic ring 2 from completely leaving the accommodation space 11 after being separated.

[0054] When the torque transmission protection mechanism is in the protection state, it is necessary to prevent the torque output gear 1 from directly transmitting the second magnetic ring 3. Therefore, as in this embodiment, the inner wall of the accommodating space 11 is clearance-matched with the outer wall of the second magnetic ring 3, or as in some other embodiments, the inner wall of the accommodating space 11 and the outer wall of the second magnetic ring 3 are in smooth contact as much as possible. In this embodiment, the gap between the inner wall of the accommodating space 11 and the outer wall of the second magnetic ring 3 is small, so that the inner wall of the accommodating space 11 can play a considerable radial positioning effect on the second magnetic ring 3, so as to allow the first magnetic ring 2 and the second magnetic ring 3 to always be relative to each other in the axial direction of the first center line.

[0055] The first magnetic ring 2 and the second magnetic ring 3 are both existing technologies and can be customized by existing magnet manufacturers.

[0056] The torque transmission protection mechanism of this embodiment further includes a rotating shaft 4 extending axially along the first center line, see Fig.10 The rotating shaft 4 includes a connecting section 41, a circumferential positioning section 42 and an axial positioning section 43 in sequence along the first center line. The rotating shaft 4 is positioned axially and radially by the housing.

[0057] A circumferential positioning hole 33 is provided in the middle of the second magnetic ring 3, and a circumferential positioning section 42 is inserted in the circumferential positioning hole 33. In this embodiment, the circumferential positioning hole 33 is a square hole, and the cross section of the circumferential positioning section 42 is a square. Therefore, the second magnetic ring 3 can obtain circumferential positioning and radial positioning on the circumferential positioning section 42, and the second magnetic ring 3 can also slide axially along the first center line on the circumferential positioning section 42. The end of the coupling section 41 can be coupled with the end of the tool, so that the second magnetic ring 3 realizes the transmission of the tool through the rotating shaft 4.

[0058] In some embodiments, the motor shaft of the motor does not directly drive the torque output gear 1 to rotate, but needs to pass through the transmission gear, so the torque output gear 1 needs to obtain corresponding support. For this purpose, a support hole 24 is opened in the middle of the first magnetic ring 2, and the axial positioning section 43 is inserted in the support hole 24, thereby supporting the second magnetic ring 3 through the rotating shaft 4.

[0059] Similarly, in order to prevent the first magnetic ring 2 from driving the rotating shaft 4 to rotate, the outer wall of the axial positioning section 43 and the inner wall of the supporting hole 24 should be kept as smooth as possible, or the two should be matched with a clearance. Accordingly, when the torque transmission protection mechanism is in the protection state, the first magnetic ring 2 can rotate around the first center line on the rotating shaft 4 without driving the rotating shaft 4 to rotate synchronously.

[0060] See also Figure 11-Figure 12In this embodiment, the torque transmission protection mechanism further includes an elastic member (not shown in the figure), and a stopper 5 is provided on the rotating shaft 4. The elastic member is located on the side of the second magnetic ring 3 away from the first magnetic ring 2. The elastic member can be a spring and is sleeved on the connecting section 41. The two ends of the elastic member are respectively abutted on the second magnetic ring 3 and the connecting section 41. The stopper 5 is located on the side of the first magnetic ring 2 away from the second magnetic ring 3. One end of the positioning groove 112 is located at the end of the torque output gear 1 close to the connecting section 41, and the other end of the positioning groove 112 is located in the middle of the accommodating space 11.

[0061] When the torque transmission protection mechanism is in the transmission state, the elastic member squeezes the second magnetic ring 3 , and the second magnetic ring 3 and the first magnetic ring 2 are adsorbed, so that the protrusion 23 abuts against the end wall of the positioning groove 112 , so that the torque output gear 1 abuts against the stopper 5 .

[0062] When the torque transmission protection mechanism is in the protection state, under the action of repulsive force between the second magnetic ring 3 and the first magnetic ring 2, the second magnetic ring 3 further squeezes the elastic member and slides toward the connecting section 41 on the circumferential positioning section 42. At the same time, under the action of the repulsive force, the protrusion 23 still abuts against the end wall of the positioning groove 112, and the torque output gear 1 abuts against the stopper 5.

[0063] During the process of the torque transmission protection mechanism switching from the protection state to the transmission state, the elastic member can provide additional thrust so that the second magnetic ring 3 can be smoothly adsorbed to the first magnetic ring 2, thereby preventing the second magnetic ring 3 and the first magnetic ring 2 from returning to the repulsive state before they come into contact due to excessive rotation angle of the torque output gear 1.

[0064] In this embodiment, the cross-sectional shape of the axial positioning section 43 is circular, and the support hole 24 is a circular hole. In some embodiments, the outer diameter of the axial positioning section 43 is smaller than the diameter of the support hole 24, so there is a clearance fit between the axial positioning section 43 and the support hole 24, and when the torque transmission protection mechanism is in the protection state, the first magnetic ring 2 loses the radial positioning effect. Fig.13In order to prevent the first magnetic ring 2 from directly transmitting torque to the rotating shaft 4, the stopper 5 is designed to be annular, and the axial positioning section 43 is arranged in the middle of the stopper 5. The stopper 5 and the axial positioning section 43 are in smooth contact, so the stopper 5 can rotate on the axial positioning section 43 alone and cannot play a transmission effect on the rotating shaft 4. The outer wall of the axial positioning section 43 is convex to form a retaining rib 51, and the retaining rib 51 is located on the side of the stopper 5 away from the torque output gear 1. The stopper 5 can always abut against the retaining rib 51 to obtain axial positioning. Of course, the stopper 5 and the retaining rib 51 are also in smooth contact. The torque output gear 1 always abuts against the stopper 5, and the torque output gear 1 and the stopper 5 are in direct friction contact. The friction coefficient between the torque output gear 1 and the stopper 5 is large, thereby obtaining a large friction force, so that the torque output gear 1 is radially positioned on the rotating shaft 4. Correspondingly, under the cooperation of the protrusion 23 and the positioning groove 112, the first magnetic ring 2 can also always obtain radial positioning on the rotating shaft 4.

[0065] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A torque transmission protection mechanism, characterized in that: include: A torque output gear (1) having a first center line, wherein a receiving space (11) extending axially along the first center line is provided in the middle of the torque output gear (1); A first magnetic ring (2) is positioned at the accommodation space (11) along the circumferential direction of the first center line, the first magnetic ring (2) having a plurality of first N poles (21) and a plurality of first S poles (22), the first N poles (21) and the first S poles (22) being arranged alternately in the circumferential direction of the first center line; and A second magnetic ring (3) is arranged opposite to the first magnetic ring (2) in the axial direction of the first center line, the second magnetic ring (3) has a plurality of second N poles (31) and second S poles (32), and the second N poles (31) and the second S poles (32) are arranged alternately in the circumferential direction of the first center line; The torque transmission protection mechanism has a transmission state and a protection state; When the torque transmission protection mechanism is in a transmission state, the first N pole (21) is adsorbed on the second S pole (32), and the first S pole (22) is adsorbed on the second N pole (31); When the torque transmission protection mechanism is in a protection state, the first N pole (21) and the second N pole (31) are arranged opposite to each other and spaced apart in the axial direction of the first center line, and the first S pole (22) and the second S pole (32) are arranged opposite to each other and spaced apart in the axial direction of the first center line.

2. The torque transmission protection mechanism according to claim 1, characterized in that: The second magnetic ring (3) is at least partially located in the accommodating space (11); when the torque transmission protection mechanism is in a protection state, the second magnetic ring (3) is rotatably arranged around a first center line in the accommodating space (11).

3. The torque transmission protection mechanism according to claim 2, characterized in that: The torque transmission protection mechanism also includes a rotating shaft (4), the rotating shaft (4) is arranged between the first magnetic ring (2) and the second magnetic ring (3), the second magnetic ring (3) is positioned on the rotating shaft (4) along the circumference of the first center line, and the rotating shaft (4) and the first magnetic ring (2) are loosely matched to allow the first magnetic ring (2) to rotate around the first center line on the rotating shaft (4).

4. The torque transmission protection mechanism according to claim 3, characterized in that: The torque transmission protection mechanism also includes an elastic member, which is located on a side of the second magnetic ring (3) facing away from the first magnetic ring (2), and the two ends of the elastic member are respectively abutted against the second magnetic ring (3) and the rotating shaft (4), and the second magnetic ring (3) is axially movably arranged on the rotating shaft (4) along the first center line.

5. The torque transmission protection mechanism according to claim 4, characterized in that: A stopper (5) is provided on the rotating shaft (4), and the stopper (5) is located on a side of the first magnetic ring (2) facing away from the second magnetic ring (3), and the torque output gear (1) abuts against the stopper (5).

6. The torque transmission protection mechanism according to claim 5, characterized in that: The rotating shaft (4) includes a connecting section (41), a circumferential positioning section (42) and an axial positioning section (43) in sequence along the axial direction of the first center line; a circumferential positioning hole (33) is provided in the middle of the second magnetic ring (3); the circumferential positioning section (42) is inserted into the circumferential positioning hole (33) so that the second magnetic ring (3) can obtain circumferential positioning on the circumferential positioning section (42) and can slide on the circumferential positioning section (42); one end of the elastic member abuts against the connecting section (41); the stopper (5) is located on the axial positioning section (43); a supporting hole (24) is provided in the middle of the first magnetic ring (2); the axial positioning section (43) is inserted into the supporting hole (24) and is gap-matched with the supporting hole (24).

7. The torque transmission protection mechanism according to claim 2, characterized in that: There is a clearance fit between the outer wall of the second magnetic ring (3) and the inner wall of the accommodating space (11).

8. The torque transmission protection mechanism according to claim 1, characterized in that: One of the inner wall of the accommodating space (11) and the outer wall of the first magnetic ring (2) is provided with a positioning groove (112) extending axially along the first center line, and the other is provided with a protrusion (23), and the protrusion (23) is slidably arranged in the positioning groove (112).

9. The torque transmission protection mechanism according to claim 8, characterized in that: The positioning groove (112) is located on the inner wall of the accommodating space (11), one end of the positioning groove (112) is located at the end of the torque output gear (1), and the other end of the positioning groove (112) is located in the middle of the accommodating space (11).

10. A planer, characterized in that: It comprises a motor, a tool and a torque transmission protection mechanism as claimed in any one of claims 1 to 9, wherein the motor is transmitted to the torque output gear (1), and the tool is transmitted to the second magnetic ring (3).

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