Shield rotation adjusting mechanism and angle grinder

Abstract

The utility model discloses a shield rotation adjusting mechanism and an angle grinder. The angle grinder comprises an output shaft. The cover body and the output shaft are coaxially arranged, the cover body is axially assembled on the output shaft, and the cover body is provided with a plurality of positioning parts in the circumferential direction of the output shaft; the at least one mounting position is arranged on the peripheral side of the output shaft, and a positioning main body and an elastic main body are arranged in the mounting position; wherein a positioning structure is arranged on the positioning main body, the elastic main body is suitable for enabling the positioning structure to abut against the positioning part, the positioning structure is suitable for being matched with at least one positioning part and abutting at least in the circumferential direction of the output shaft so as to limit the cover body to move in the circumferential direction of the output shaft, and the positioning structure is suitable for switching the matched positioning part. The angle grinder shield has the advantages of being easy to operate, convenient to use and compact in structure, the shield does not need to be detached, and a user can directly adjust the angle of the shield on the angle grinder.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of grinding equipment, in particular to a shroud rotating adjusting mechanism and an angle grinder. BACKGROUND

[0002] The angle grinder, also known as a grinding machine or a disc grinder, is a kind of portable electric tool, which is mainly used for cutting, grinding and brushing metal and stone materials, and can be used to grind, cut, remove rust and polish metal components by using high-speed rotating thin piece grinding wheels, rubber grinding wheels and steel wire wheels.

[0003] In order to ensure the safety of the angle grinder, a shroud needs to be arranged around the wheel disc of the angle grinder to separate the wheel disc and the external environment, so as to reduce the probability of direct contact between the operator and the wheel disc. Considering that the angle of the angle grinder needs to be adjusted during use, the shroud is generally an adjustable structure, which can rotate and be fixed along the circumference of the wheel disc.

[0004] However, the existing shroud of the angle grinder has the following defects: the shroud of the angle grinder on the market is generally locked and fixed by fastening washers. When adjusting the shroud, the fastening washers need to be removed first, and then the fastening washers need to be installed after the adjustment of the shroud is completed. The operation is relatively troublesome, and the parts are easy to be lost during the adjustment process. SUMMARY

[0005] An object of the application is to provide a shroud rotating adjusting mechanism and an angle grinder which are simple and convenient to operate and can directly adjust the angle of the shroud.

[0006] To achieve the above object, the application adopts the following technical scheme: a shroud rotating adjusting mechanism, comprising:

[0007] an output shaft;

[0008] a shroud body, the shroud body and the output shaft are coaxially arranged, the shroud body is axially assembled on the output shaft, and the shroud body is provided with a plurality of positioning portions along the circumference of the output shaft;

[0009] at least one mounting position, the mounting position is arranged on the circumferential side of the output shaft, and the mounting position is provided with a positioning body and an elastic body;

[0010] wherein the positioning body is provided with a positioning structure, the elastic body is adapted to abut the positioning structure to the positioning portion, the positioning structure is adapted to cooperate with at least one of the positioning portions and abut at least in the circumferential direction of the output shaft to limit the movement of the shroud body along the circumferential direction of the output shaft, and the positioning structure is adapted to switch the cooperating positioning portion so that the shroud body is adapted to rotate by a predetermined angle along the output shaft and be positioned.

[0011] In some embodiments, the elastic body is located on a side of the positioning structure away from the positioning part, one end of the elastic body is kept relatively fixed in the mounting position, and the other end of the elastic body is adapted to push the positioning structure close to the positioning part.

[0012] In some embodiments, the positioning body comprises a limiting piece, a fixed end, and a movable end, the limiting piece is rotationally connected with the fixed end along the axial direction of the output shaft, the positioning structure is arranged at the movable end, and the movable end is adapted to reciprocally move relative to the limiting piece.

[0013] In some embodiments, the number of the positioning bodies and the elastic bodies is multiple, and the positioning bodies and the elastic bodies are arranged in cooperation along the circumferential direction of the output shaft.

[0014] In some embodiments, the elastic body is integrally connected with the positioning body, the elastic body is an elastic bending structure, the elastic body is adapted to cooperate with the mounting position in the circumferential direction of the output shaft to limit the movement of the positioning body along the circumferential direction of the output shaft, and the elastic body is adapted to elastically deform at least along the radial direction of the output shaft to make the positioning body close to the positioning part; the number of the elastic bodies is even, and the elastic bodies are symmetrically distributed on both sides of the positioning body.

[0015] In some embodiments, a first guide surface is arranged on the positioning body, the first guide surface is connected with the positioning structure, and the first guide surface is adapted to guide the positioning part to push the positioning structure in the radial direction of the output shaft.

[0016] In some embodiments, second guide surfaces are arranged on both sides of the positioning part, and the second guide surfaces are adapted to guide the positioning part to push the positioning structure in the radial direction of the output shaft.

[0017] In some embodiments, two adjacent positioning parts are connected through the second guide surfaces.

[0018] In some embodiments, a first stop part is arranged on the cover body, a second stop part is arranged on at least one side of the mounting position, the first stop part and the second stop part are adapted to abut in cooperation in the circumferential direction of the output shaft to limit the maximum angle of rotation of the cover body along the output shaft; the positioning part is a groove structure, and the positioning structure is a protruding structure; the positioning part is a protruding structure, and the positioning structure is a groove structure; and the mounting position is opened in the radial direction of the output shaft.

[0019] An angle grinder comprises the cover rotation adjusting mechanism as described in any of the above.

[0020] Compared with the prior art, the shroud rotating adjusting mechanism has the advantages that the shroud rotating adjusting mechanism can help the shroud body to be rotationally connected in a positionable manner around the output shaft, the shroud body can be unlocked by pulling the shroud body along the circumference of the output shaft, the opening direction of the shroud body can be changed, and finally the relative angle between the opening of the shroud body and the angle grinder can be changed, the operation is simple and convenient, the shroud body can be adjusted without disassembly, the use convenience is improved, the structure is compact, and the shroud body can be easily integrated into the existing angle grinder structure design. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structure separation view of a shroud body and an output shaft according to a preferred embodiment of the shroud rotating adjusting mechanism.

[0022] Figure 2 is a schematic view of the arrangement of a positioning body and an elastic body in an installation position according to a preferred embodiment of the shroud rotating adjusting mechanism.

[0023] Figure 3 is a schematic view of the combination of a positioning body and a positioning part according to a preferred embodiment of the shroud rotating adjusting mechanism.

[0024] Figure 4 is a schematic view of the connection of a shroud body and an output shaft according to a preferred embodiment of the shroud rotating adjusting mechanism.

[0025] Figure 5 is a structure separation view of a shroud body and an output shaft according to another preferred embodiment of the shroud rotating adjusting mechanism.

[0026] Figure 6 is a cross-sectional view of the combination of a positioning body and a positioning part according to another preferred embodiment of the shroud rotating adjusting mechanism.

[0027] Figure 7 is a longitudinal cross-sectional view of the combination of a positioning body and a positioning part according to another preferred embodiment of the shroud rotating adjusting mechanism.

[0028] Figure 8 is a schematic view of the combination of a positioning body and a positioning part according to another preferred embodiment of the shroud rotating adjusting mechanism.

[0029] Figure 9 is a schematic view of the combination of a plurality of positioning bodies and positioning parts according to another preferred embodiment of the shroud rotating adjusting mechanism.

[0030] Figure 10 is a schematic view of the combination of a positioning body and a plurality of positioning parts according to another preferred embodiment of the shroud rotating adjusting mechanism.

[0031] Figure 11 is an overall structural view of a preferred embodiment of the angle grinder according to the present application.

[0032] In the figure: 1, output shaft; 2, cover body; 21, positioning part; 22, second guide surface; 23, first stop part; 3, shaft seat; 31, mounting position; 32, second stop part; 4, positioning main body; 41, positioning structure; 42, first guide surface; 43, limiting piece; 44, fixed end; 45, movable end; 5, elastic main body; 6, angle grinder main machine; 7, cutting disc. DETAILED DESCRIPTION

[0033] Hereinafter, the present application will be further described in conjunction with specific embodiments, and it should be noted that the following described embodiments or technical features can be combined in any manner to form new embodiments without conflict.

[0034] In the description of the present application, it should be noted that for orientation words, such as the terms "center", "transverse", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as limiting the specific protection scope of the present application.

[0035] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0036] The terms "include" and "have" and any variations thereof in the specification and claims of the present application are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0037] The present application will be further described below in conjunction with the drawings:

[0038] As Figures 1 to 11 shown, the present application provides a cover rotation adjusting mechanism, comprising:

[0039] An output shaft 1, both ends of the output shaft 1 are connected to an angle grinder main machine 6 and a cutting disc 7 (wheel disc) respectively.

[0040] The cover body 2 is coaxially arranged with the output shaft 1, is axially assembled on the output shaft 1, is arranged on the peripheral side of the output shaft 1 between the angle grinder main machine 6 and the cutting piece 7, and extends to the cutting piece 7 to cover at least part of the peripheral side of the cutting piece 7, so as to achieve the protection purpose. In the present application, a plurality of positioning portions 21 are arranged on the cover body 2 along the peripheral direction of the output shaft 1, and cooperate with the positioning main body 4 and the elastic main body 5 to realize the rotation adjustment function of the cover.

[0041] The mounting positions 31 are arranged on the peripheral side of the output shaft 1, and the number of the mounting positions 31 can be designed according to actual needs. For example, the more the number of the mounting positions 31, the stronger the positioning stability of the cover. The positioning main body 4 and the elastic main body 5 are adapted to be arranged in the mounting positions 31.

[0042] The positioning main body 4 is provided with a positioning structure 41 adapted to cooperate with at least one positioning portion 21 and abut at least in the peripheral direction of the output shaft 1 to limit the movement of the cover body 2 along the peripheral direction of the output shaft 1. That is, when the positioning structure 41 abuts against the positioning portion 21, the rotation of the cover body 2 relative to the angle grinder main machine 6 is prevented.

[0043] It can be understood that the positioning structure 41 can cooperate with a single positioning portion 21 or a plurality of positioning portions 21. The more the number of the positioning portions 21 cooperating with the positioning structure 41, the higher the structural strength of the adjustment mechanism and the less likely to be damaged.

[0044] In addition, the positioning structure 41 is adapted to switch the cooperating positioning portion 21, so that the cover body 2 is adapted to rotate by a predetermined angle along the output shaft 1 and be positioned. Through the cooperation between the positioning structure 41 and different positioning portions 21, multi-point positioning rotation can be realized.

[0045] When the positioning structure 41 cooperates with a single positioning portion 21, the distance between the positioning portions 21 can be freely set. The path through which the positioning structure 41 moves to different positioning portions 21 can be converted into the rotation of the cover body 2 by a predetermined angle along the output shaft 1. If the positioning portions 21 are equally spaced, the angle through which the positioning structure 41 switches between each positioning portion 21 is the same, which is convenient for user operation.

[0046] When the positioning structure 41 cooperates with a plurality of positioning portions 21, the positioning portions 21 are preferably equally spaced. In addition to the fact that the angle through which the positioning structure 41 switches between each positioning portion 21 is the same, it is also to ensure that the positioning structure 41 can be accurately positioned with each positioning portion 21, so as to avoid structural interference between individual positioning portions 21 and the positioning structure 41 due to different spacing between the positioning portions 21, thereby affecting the stability of the positioning cooperation.

[0047] The elastic body 5 is suitable for abutting the positioning structure 41 to the positioning portion 21, can improve the cooperation stability between the positioning structure 41 and the positioning portion 21, and makes the positioning structure 41 and the positioning portion 21 need to use a certain external force to be in a disengaged state, so that the phenomenon that the cover body 2 itself rotates can be effectively prevented.

[0048] It can be understood that the elastic body 5 can also improve the efficiency of abutting the positioning structure 41 to the positioning portion 21. Through the elastic deformation of the elastic body 5, the action of abutting the positioning structure 41 to the positioning portion 21 by the elastic body 5 can be effectively fed back to the user during the rotation of the cover body 2, so that a plurality of preset rotation gears are formed during the rotation of the cover body 2, and the user can identify whether the positioning is successful, so that the adjustment process is more convenient and smooth.

[0049] In some embodiments, the mounting position 31 can be arranged on the side of the output shaft 1 for connecting the angle grinder main machine 6 and the shaft seat 3 and other components of the cover body 2, so as to make full use of the space and make the structure of the adjustment mechanism more compact.

[0050] In some embodiments, the positioning portion 21 is a groove structure, and the positioning structure 41 is a protruding structure. The shapes of the groove structure and the protruding structure can be arc-shaped, wave-shaped, rectangular, trapezoidal, etc.

[0051] Since the thickness of the cover body 2 is low, when the positioning portion 21 is a groove structure (as shown in Figure 6 When the positioning portion 21 is arranged at the weak position of the cover body 2, a limiting body can be welded on the outer side of the positioning portion 21 in the radial direction of the output shaft 1 to realize the reinforcement of the structure.

[0052] In some embodiments, the positioning portion 21 is a protruding structure, and the positioning structure 41 is a groove structure. The shapes of the groove structure and the protruding structure can be arc-shaped, wave-shaped, rectangular, trapezoidal, etc.

[0053] In some embodiments, the mounting position 31 is arranged along the radial direction of the output shaft 1. The mounting position 31 can limit and guide the elastic body 5, so that the cooperation state between the elastic body 5 and the positioning body 4 is more stable, thereby improving the overall stability of the adjustment mechanism.

[0054] In some embodiments, the elastic body 5 is located on the side of the positioning structure 41 away from the positioning portion 21. One end of the elastic body 5 is relatively fixed in the mounting position 31, and the other end of the elastic body 5 is suitable for pushing the positioning structure 41 to be close to the positioning portion 21.

[0055] In some embodiments, the positioning body 4 is provided with a first guide surface 42, which is connected with the positioning structure 41, and is adapted to guide the positioning portion 21 to push the positioning structure 41 in the radial direction of the output shaft 1, so as to reduce the difficulty of mutual disengagement between the positioning structure 41 and the positioning portion 21, reduce the difficulty of the cover body 2 to rotate to switch the gear, and improve the operation smoothness.

[0056] In some embodiments, the first guide surface 42 is preferably an arc surface.

[0057] In some embodiments, the positioning portion 21 is provided with a second guide surface 22 on both sides, which is adapted to guide the positioning portion 21 to push the positioning structure 41 in the radial direction of the output shaft 1, so as to reduce the difficulty of mutual disengagement between the positioning structure 41 and the positioning portion 21, reduce the difficulty of the cover body 2 to rotate to switch the gear, and improve the operation smoothness.

[0058] In some embodiments, the second guide surface 22 is preferably an arc surface.

[0059] In some embodiments, the second guide surface 22 is connected between the two adjacent positioning portions 21, so that the positioning structure 41 can move more smoothly and loosely between the different positioning portions 21, and the jamming is reduced.

[0060] In some embodiments, the cover body 2 is provided with a first stop portion 23, and the mounting site 31 is provided with a second stop portion 32 on at least one side, and the first stop portion 23 and the second stop portion 32 are adapted to abut in the circumferential direction of the output shaft 1, so as to limit the maximum angle of the cover body 2 rotating along the output shaft 1, and the purpose is to limit the rotation stroke of the cover body 2 near the positioning portion 21, so as to avoid the cover body 2 from rotating excessively, which causes the positioning body 4 and the positioning portion 21 to be too far away from each other and affect the cooperation positioning.

[0061] As shown in the embodiments of Figure 4 The second stop portion 32 is preferably provided on the outer side of the shaft seat 3, the cover body 2 extends axially to the outer side of the shaft seat 3 to form the first stop portion 23, and the first stop portion 23 and the second stop portion 32 are connected in the circumferential direction of the output shaft 1.

[0062] As shown in the embodiments of Figures 1 to 3In the shown embodiment, the positioning body 4 comprises a limiting member 43, a fixed end 44 and a movable end 45, the limiting member 43 is rotationally connected with the fixed end 44 along the axial direction of the output shaft 1, the positioning structure 41 is arranged at the movable end 45, the movable end 45 is adapted to reciprocally move relative to the limiting member 43, when the cover body 2 rotates relative to the positioning body 4, the cover body 2 pushes the positioning body 4 along the first guide surface 42 to extrude the elastic body 5, so that the clamping structure of the positioning body 4 is relatively separated from the positioning part 21 of the cover body 2, and is abutted by the radial protrusion between the two positioning parts 21 of the cover body 2, under the rebounding action of the elastic body 5, the positioning structure 41 of the positioning body 4 is subsequently guided to the next positioning part 21 of the cover body 2.

[0063] Specifically, as shown in the figure, Figure 2 the positioning body 4 and the elastic body 5 in this case can be embodied in the form of a combination of a spring and a spring, the two ends of the spring are respectively the fixed end 44 and the movable end 45, the limiting member 43 is a plug, the plug rotationally connects the fixed end 44 of the spring along the axial direction of the output shaft 1, and the movable end 45 can be close to the positioning part 21 and abut against the positioning part 21.

[0064] As shown in the figure, Figures 5 to 7 the positioning body 4 and the elastic body 5 can also be embodied in the form of a combination of a positioning ball and a spring, the mounting position 31 is used to limit the radial movement of the positioning ball and the spring along the output shaft 1, and the spring can abut the positioning ball against the positioning part 21 for clamping positioning.

[0065] When the positioning body 4 is a positioning ball, a part of the outer surface of the positioning body 4 can be regarded as the first guide surface 42, and the positioning body 4 can realize the guiding function similar to the first guide surface 42 through rotation.

[0066] As shown in the figure, Figures 8 to 10 the elastic body 5 and the positioning body 4 are integrally connected, that is, the elastic body 5 and the positioning body 4 are respectively a part of the structure, the elastic body 5 can be formed by bending, and the elastic deformation capacity of the bending structure is used to drive the positioning body 4 to move.

[0067] Specifically, when the positioning body 4 is misaligned with the positioning part 21 through rotation, the positioning part 21 can press the positioning body 4, the positioning body 4 transmits the force to the elastic body 5, the elastic body 5 can be further bent, and the elastic deformation amount increases, when the positioning body 4 rotates to the target positioning part 21, the deformation of the elastic body 5 recovers, and the positioning body 4 is pushed to cooperate with the target positioning part 21.

[0068] In some embodiments, the number of elastic bodies 5 is even, which is used to enhance the elastic deformation force transmitted to the positioning body 4.

[0069] AsFigure 8 In the embodiment shown, the elastic body 5 is symmetrically distributed on both sides of the positioning body 4, and the elastic deformation of the elastic body 5 is used to make the positioning body 4 move relative to the output shaft 1.

[0070] After bending, the elastic body 5 can form a locking end, which can engage with the mounting position 31 in the circumferential direction of the output shaft 1 to improve the stability of the elastic body 5 and the positioning body 4 in the mounting position 31 and reduce the shaking of the positioning body 4 before and after positioning. It can be understood that the elastic body 5 and the positioning body 4 need to be restricted by the cover 2 or the shaft seat 3 in a plane perpendicular to the axial direction of the output shaft 1, so that the positioning body 4 can only move in the radial direction of the output shaft 1 and engage with the positioning part 21, thereby realizing multi-point positioning rotation.

[0071] Under this scheme, the positioning body 4 has better resilience when rotating the cover 2, thereby improving the feedback of the gear position generated during the rotation of the cover 2, making it clearer, allowing users to better perceive the corresponding position, improving the user's operating experience, and reducing the difficulty of user operation.

[0072] Under this scheme, the assembly of the cover 2, bearing 3, positioning body 4, and elastic body 5 is easier, which can improve production efficiency.

[0073] In some embodiments, when the elastic body 5 is integrally connected with the positioning body 4, a separate elastic body 5 such as a spring can be additionally provided to push the positioning structure 41 of the positioning body 4 to cooperate and abut against the positioning part 21, which can further increase the stability of the positioning cooperation, and at the same time ensure the rebound force of the positioning body 4, avoiding insufficient rebound force of the elastic body 5 integrally connected with the positioning body 4.

[0074] like Figure 9 In the illustrated embodiment, there are multiple positioning bodies 4 and elastic bodies 5. The positioning bodies 4 and elastic bodies 5 are arranged in a circumferential configuration along the output shaft 1. By increasing the number of positioning bodies 4 and elastic bodies 5, the stability of the housing 2's adjustment and positioning can be improved. It is understood that... Figure 9 The image only shows the case where the positioning body 4 and the elastic body 5 are combined into one unit. The same applies when the positioning body 4 and the elastic body 5 are separate structures.

[0075] like Figure 10 In the embodiment shown, the positioning structure 41 on a positioning body 4 can cooperate with multiple positioning parts 21 at the same time, thereby improving the positioning strength and positioning stability, and also improving the clarity of gear feedback.

[0076] like Figure 11 As shown, this application also provides an angle grinder, including the protective cover rotation adjustment mechanism of any of the above embodiments.

[0077] The foregoing describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-described embodiments, and the above-described embodiments and descriptions in the specification are only the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A protective cover rotation adjustment mechanism, characterized in that, include: Output shaft; The cover is coaxially arranged with the output shaft, and the cover is axially assembled to the output shaft. The cover is provided with a plurality of positioning parts along the circumference of the output shaft. At least one mounting position is arranged around the periphery of the output shaft, and a positioning body and an elastic body are provided in the mounting position; The positioning body is provided with a positioning structure. The elastic body is adapted to make the positioning structure abut against the positioning part. The positioning structure is adapted to cooperate with at least one of the positioning parts and abut against at least in the circumferential direction of the output shaft to restrict the circumferential movement of the cover along the output shaft. The positioning structure is adapted to switch the cooperating positioning part so that the cover is adapted to rotate along the output shaft by a predetermined angle and be positioned.

2. The protective cover rotation adjustment mechanism as described in claim 1, characterized in that: The elastic body is located on the side of the positioning structure away from the positioning part. One end of the elastic body is kept relatively fixed in the mounting position, and the other end of the elastic body is adapted to push the positioning structure closer to the positioning part.

3. The protective cover rotation adjustment mechanism as described in claim 2, characterized in that: The positioning body includes a limiting member, a fixed end, and a movable end. The limiting member and the fixed end are rotatably connected along the axial direction of the output shaft. The positioning structure is located at the movable end, which is adapted to reciprocate relative to the limiting member.

4. The protective cover rotation adjustment mechanism as described in claim 2, characterized in that: The number of the positioning body and the elastic body is multiple, and the positioning body and the elastic body are arranged in a circumferential manner along the output shaft.

5. The protective cover rotation adjustment mechanism as described in claim 2, characterized in that: The elastic body is integrally connected to the positioning body. The elastic body is an elastically bent structure. The elastic body is adapted to cooperate with the mounting position in the circumferential direction of the output shaft to restrict the circumferential movement of the positioning body along the output shaft. The elastic body is adapted to elastically deform at least in the radial direction of the output shaft so that the positioning body moves closer to the positioning part. The number of elastic bodies is even, and the elastic bodies are symmetrically distributed on both sides of the positioning body.

6. The protective cover rotation adjustment mechanism as described in claim 1, characterized in that: The positioning body is provided with a first guide surface, which is connected to the positioning structure. The first guide surface is adapted to guide the positioning part to push the positioning structure in the radial direction of the output shaft.

7. The protective cover rotation adjustment mechanism as described in claim 1, characterized in that: The positioning part is provided with a second guide surface on both sides, and the second guide surface is adapted to guide the positioning part to push the positioning structure in the radial direction of the output shaft.

8. The protective cover rotation adjustment mechanism as described in claim 7, characterized in that: The two adjacent positioning parts are connected by the second guide surface.

9. The protective cover rotation adjustment mechanism as described in claim 1, characterized in that: The cover is provided with a first stop portion, and the mounting position is provided with a second stop portion on at least one side. The first stop portion and the second stop portion are adapted to cooperate and abut against each other in the circumferential direction of the output shaft to limit the maximum angle of rotation of the cover body along the output shaft. The positioning portion is a groove structure, and the positioning structure is a protrusion structure. The positioning portion is a protrusion structure, and the positioning structure is a groove structure. The positioning portions are evenly distributed. The mounting position is opened along the radial direction of the output shaft.

10. An angle grinder, characterized in that: Includes the protective cover rotation adjustment mechanism as described in any one of claims 1 to 9.

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