Protective structure and angle grinder

Abstract

The invention discloses a protection structure and an angle grinder, and relates to the field of electric tools, the protection structure comprises a bearing seat and a protection assembly, the protection assembly comprises a protection cover and a support rotationally connected to the protection cover, the protection cover is provided with a mounting channel for the bearing seat to penetrate through, the support is rotationally connected into the mounting channel, and the support is provided with a limiting boss; the surface of the bearing seat is provided with a limiting sliding groove in sliding fit with the limiting boss in the circumferential direction of the bearing seat, the end face, close to the protective cover, of the bearing seat is provided with a notch allowing the limiting boss to pass through and enter the limiting sliding groove, and when the support rotates till the limiting boss is located in the limiting sliding groove and staggered with the notch, the protective cover is fixed to the bearing seat in the axial direction. When the support rotates until the limiting boss is opposite to the notch, the protective cover can be separated from the bearing seat in the axial direction. The device has the advantage that the protective cover can be quickly disassembled without tools.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric tools, in particular to a protective structure and an angle grinder. BACKGROUND

[0002] The full name of the angle grinder is an angle grinder, which is a handheld electric tool for cutting or grinding, mainly used for cutting, grinding and brushing metal or stone, etc. With the development of the angle grinder, based on the requirements of safety production specification, the protective cover is equipped on the angle grinder for protection.

[0003] The angle grinder in the prior art is inconvenient to disassemble the protective cover, and each time the protective cover needs to be disassembled with the help of a tool, which not only increases the complexity and time cost of operation, reduces the work efficiency, but also causes the protective cover to be unable to be disassembled in time due to the lack of tools in some emergency or special situations. SUMMARY

[0004] The present application aims to solve one of the technical problems in the related art to some extent. To this end, the present application provides a protective structure and an angle grinder, which has the advantage of tool-free quick disassembly of the protective cover.

[0005] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: A protective structure, comprising a bearing seat and a protective assembly, the protective assembly comprising a protective cover and a bracket rotatably connected to the protective cover, the protective cover being provided with an installation channel for the bearing seat to pass through, the bracket being provided with a limiting boss, the surface of the bearing seat being provided with a limiting sliding groove along the circumferential direction of the bearing seat, the limiting boss being in sliding fit with the limiting sliding groove, the end surface of the bearing seat close to the protective cover being provided with a gap for the limiting boss to pass through and enter the limiting sliding groove, when the bracket is rotated to the limiting boss being located in the limiting sliding groove and being staggered with the gap, the protective cover is fixed to the bearing seat along the axial direction, and when the bracket is rotated to the limiting boss being opposite to the gap, the protective cover can be separated from the bearing seat along the axial direction.

[0006] In the present application, a bracket is rotatably arranged through an installation channel within the protective cover. When the bracket is rotated until the limiting boss is located within the limiting chute and is offset from the notch, the limiting boss is restricted by the limiting chute and can no longer escape through the notch. At this time, the bracket is installed on the bearing seat, and the protective cover is also axially fixed to the bearing seat, achieving installation. When the bracket is rotated to a position opposite the notch, the limiting boss can be disengaged from the limiting chute through the notch, achieving separation between the bracket and the bearing seat, and then the protective cover can be axially separated from the bearing seat, achieving removal of the protective cover. Compared to the protective structure in the prior art that requires the use of tools for disassembly, the protective structure of the present application can achieve rapid installation and removal of the protective cover and the bearing seat by rotating the bracket, without the need for tools, saving time and labor costs and improving work efficiency. In addition, the limiting boss and the limiting chute slide in cooperation, so that the protective cover can be stably fixed to the bearing seat after installation, and is not easy to loosen or fall off, providing safety protection for equipment operation.

[0007] Optionally, a guide groove is provided on the surface of the bearing seat along its own axial direction, one end of the guide groove extends to the notch, and the other end extends to the limiting sliding groove.

[0008] The axially extending guide slot allows the bracket to move axially relative to the bearing seat to facilitate installation or removal of the protective cover. In addition, the guide slot provides a clear guide for the installation of the limit boss, allowing the operator to quickly guide the limit boss into the limit slot when installing the protective assembly, improving installation efficiency and accuracy.

[0009] Optionally, the limiting sliding groove is constructed in an arc shape and is configured in multiple numbers, the multiple limiting sliding grooves are distributed at intervals along the circumference of the bearing seat, and the notches correspond to the limiting sliding grooves one by one.

[0010] Multiple arc-shaped limit slots ensure the bracket is held in place in multiple directions after installation, preventing the shield from loosening, shifting, or falling off during operation, thereby improving the stability and reliability of the protective structure. Furthermore, when subjected to external forces, the individual limit slots share the force, preventing structural damage caused by excessive localized forces.

[0011] Optionally, a positioning component is further included, which includes a locking groove and a clamping platform, one of the locking groove and the clamping platform is set on the bearing seat, and the other is set on the protective cover. When the clamping platform extends into the locking groove, it can limit the relative rotation of the protective cover and the bearing seat.

[0012] When the platform is inserted into the locking slot, it restricts relative rotation between the protective cover and the bearing seat, effectively limiting rotation between the protective assembly and the bearing seat. The relatively simple structure of the locking slot and platform, lacking complex mechanical and electronic components, ensures high reliability. When the platform is released from the locking slot, the protective cover can rotate relative to the bearing seat, enabling quick angle switching and user-friendly operation.

[0013] Optionally, the protective cover includes a cover body having a first mounting hole and a base having a second mounting hole, the cover body is fixedly connected to the base, the first mounting hole and the second mounting hole are opposite to each other to form the mounting channel, the bearing seat is provided with a plurality of locking grooves along its circumference on a side facing the base, and the base is provided with a plurality of clamping platforms distributed along its circumference on a side close to the bearing seat, and the clamping platforms correspond one-to-one to the locking grooves.

[0014] The latches correspond to the locking slots one-to-one, meaning each latch has a matching locking slot. This ensures that the latches fit precisely into the corresponding locking slots during installation, achieving precise positioning and avoiding installation difficulties or inaccurate positioning caused by a mismatch between the latches and the slots. Circumferentially distributed, the locking slots and latches can position and secure the bearing seat and base at multiple locations. Furthermore, the multiple circumferential fixing points evenly distribute forces, reducing localized stress concentration.

[0015] Optionally, the base is provided with an annular mounting groove along its circumference, an elastic member is provided in the annular mounting groove, the base and the bracket are relatively slidably connected in the axial direction, and the elastic member can enable the base to maintain a tendency to move toward the bearing seat.

[0016] The elastic element automatically resets the base, eliminating the need for manual repositioning. This simplifies the operation process, saves time and manpower, and improves work efficiency. Furthermore, the card holder automatically engages the locking slot, ensuring the cover remains secure after angle adjustment. This prevents accidental rotation due to external factors (such as vibration and collision), ensuring the proper function and safety of the cover.

[0017] Optionally, a ball and a gasket are provided in the annular mounting groove, the ball is located at the bottom of the annular mounting groove, the gasket is located on the side of the ball close to the elastic member, one end of the elastic member abuts against the gasket, and the other end abuts against the side of the bracket close to the bearing seat.

[0018] The ball bearing converts sliding friction into rolling friction, reducing friction during base rotation and improving movement flexibility. A gasket, located on the side of the ball bearing closest to the elastic element, acts as a barrier and buffer, preventing direct contact between the ball bearing and the elastic element, potentially causing wear on the elastic element due to rolling, or preventing the ball bearing from becoming stuck in the elastic element.

[0019] Optionally, the bracket includes a third mounting hole, a limiting portion and a supporting portion from the inside to the outside; the limiting boss extends from the limiting portion toward the center of the third mounting hole, the supporting portion is clamped between the cover body and the base, and the limiting portion is passed through the first mounting hole.

[0020] The third mounting hole of the bracket cooperates with the bearing seat to ensure the stability of the bracket's rotation; the limiting part is passed through the first mounting hole so that the limiting boss can extend into the limiting slide groove of the bearing seat; the supporting part is clamped between the cover body and the base to fix the bracket axially between the cover body and the base, so that the protective component can move synchronously along the axial direction, thereby improving the reliability of the structure.

[0021] Optionally, the cover body includes a bottom plate constructed in a semicircular or fan-shaped shape and a frame arranged on the outer edge of the bottom plate, and the frame extends toward a side of the bottom plate away from the bearing seat.

[0022] A semicircular or fan-shaped design better fits the shape of the angle grinder's working head, providing protection. A frame is provided on the outer edge of the base plate, extending toward the side of the base plate away from the bearing seat. This frame enhances the shield's three-dimensional protection, preventing objects from entering the protected area from the sides.

[0023] In addition, the present invention further provides an angle grinder, the angle grinder comprising any one of the aforementioned protective structures. The reasoning process for the beneficial effects of the angle grinder provided by the present invention and the aforementioned protective structures is similar and will not be repeated here.

[0024] These features and advantages of the present invention will be further disclosed in the following detailed description and accompanying drawings. The preferred embodiments and means of the present invention will be fully illustrated in conjunction with the accompanying drawings, but are not intended to limit the technical solutions of the present invention. Furthermore, although multiple features, elements, and components may be present in each of the following text and accompanying drawings, they may be labeled with different symbols or numbers for convenience, but all represent components with the same or similar structure or function. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the accompanying drawings: Figure 1 Schematic diagram of the structure of the angle grinder in the present invention; Figure 2 Schematic diagram of the structure of the protection component of the present invention; Figure 3 is a cross-sectional view of the protective component of the present invention; Figure 4 Schematic diagram of the explosion of the protective component of the present invention; Figure 5 It is a cross-sectional view of the base in the present invention.

[0026] Among them, 1. bearing seat; 11. limiting slide groove; 12. notch; 13. guide groove; 14. locking groove; 2. protective component; 21. bracket; 211. limiting boss; 212. third mounting hole; 213. limiting part; 214. supporting part; 22. cover body; 221. first mounting hole; 222. bottom plate; 223. frame; 23. base; 231. second mounting hole; 232. annular mounting groove; 233. elastic member; 234. ball; 235. gasket; 236. locking table. DETAILED DESCRIPTION

[0027] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described in the embodiments are intended to explain the present invention and are not to be construed as limiting the present invention.

[0028] Reference in this specification to "one embodiment," "an example," or "an example" means that a particular feature, structure, or characteristic described in connection with the embodiment itself can be included in at least one embodiment of the present patent disclosure. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment.

[0029] Example: like Figures 1 to 4 As shown, this embodiment provides a protective structure, including a bearing seat 1 and a protective assembly 2, the protective assembly 2 includes a protective cover and a bracket 21 rotatably connected to the protective cover, the protective cover is provided with an installation channel for the bearing seat 1 to pass through, the bracket 21 is provided with a limiting boss 211, the surface of the bearing seat 1 is provided with a limiting groove 11 along its own circumference, which is slidably matched with the limiting boss 211, and the end face of the bearing seat 1 close to the protective cover is provided with a notch 12 for the limiting boss 211 to pass through and enter the limiting groove 11. When the bracket 21 rotates until the limiting boss 211 is located in the limiting groove 11 and is staggered with the notch 12, the protective cover is axially fixed to the bearing seat 1, and when the bracket 21 rotates until the limiting boss 211 is opposite to the notch 12, the protective cover can be separated from the bearing seat 1 along the axial direction.

[0030] In the embodiment, the protection structure is composed of the bearing seat 1 and the protection assembly 2. The protection assembly 2 comprises the bracket 21 and the protection cover. The bearing seat 1 is installed at one end of the installation channel. The bracket 21 is rotatably connected in the installation channel, and the bracket 21 is provided with the limiting boss 211. The surface of the bearing seat 1 is provided with the limiting sliding slot 11 along the circumference of the bearing seat 1, which is in sliding fit with the limiting boss 211. The end surface of the bearing seat 1 close to the protection cover is provided with the gap 12, which is for the limiting boss 211 to pass through and enter the limiting sliding slot 11 to connect the bracket 21 and the bearing seat 1. When the bracket 21 is rotated to the position that the limiting boss 211 is located in the limiting sliding slot 11 and is staggered with the gap 12, the limiting boss 211 cannot pass through the gap 12 to be separated due to the limitation of the limiting sliding slot 11, at this time, the bracket 21 is installed on the bearing seat 1, and the protection cover is also fixed on the bearing seat 1 along the axial direction, so that the installation of the protection cover is realized. When the bracket 21 is rotated to the position that the limiting boss 211 is opposite to the gap 12, the limiting boss 211 can pass through the gap 12 to be separated from the limiting sliding slot 11, so that the bracket 21 and the bearing seat 1 are separated, and then the protection cover can be separated from the bearing seat 1 along the axial direction, so that the disassembly of the protection cover is realized.

[0031] The surface of the bearing seat 1 is provided with the guide slot 13 along the axial direction of the bearing seat 1, one end of the guide slot 13 extends to the gap 12, and the other end extends to the limiting sliding slot 11.

[0032] In this embodiment, the bearing seat 1 is connected to the bearing of the angle grinder, and a guide groove 13 is provided on its surface along its own axial direction. One end of the guide groove 13 extends to the notch 12, and the other end extends to the limiting slide 11. The limiting slide 11 is provided along the circumference of the bearing seat 1, and is used to cooperate with the limiting boss 211 of the bracket 21 to realize the limiting function. The axially extending guide groove 13 can make the bracket 21 move axially relative to the bearing seat 1 to realize the installation or removal of the protective cover. When installing the protective cover, first extend one end of the bearing seat 1 into the installation channel so that the limiting boss 211 on the bracket 21 is aligned with the notch 12 on the end face of the bearing seat 1. Since the surface of the bearing seat 1 is provided with an axial guide groove 13, and one end of the guide groove 13 is connected to the notch 12, the limiting boss 211 can slide into the guide groove 13 and move along the guide groove 13 to its other end, that is, the starting position of the limiting slide 11. Then rotate the bracket 21, and the bracket 21 drives the limiting boss 211 to slide in the limiting slot 11. When the bracket 21 is rotated until the limiting boss 211 is located in the limiting slot 11 and is offset from the notch 12, the limiting boss 211 can no longer escape from the limiting slot 11 through the notch 12. At the same time, the axial restriction of the limiting slot 11 also prevents the protective cover from moving arbitrarily in the axial direction, thereby fixing the protective cover on the bearing seat 1. When the protective assembly 2 needs to be disassembled, rotate the bracket 21 in the opposite direction so that the limiting boss 211 slides in the limiting slot 11 to a position opposite to the notch 12. At this time, the limiting boss 211 can smoothly pass through the notch 12 and slide outward along the guide groove 13, thereby realizing the separation of the protective cover from the bearing seat 1. In other embodiments, when the protective structure is applied to other power tools such as electric saws and electric drills, the bearing seat 1 should also be connected to the bearings of the corresponding power tools.

[0033] The limiting sliding groove 11 is constructed in an arc shape and is configured in multiple numbers. The multiple limiting sliding grooves 11 are distributed at intervals along the circumference of the bearing seat 1, and the notches 12 correspond to the limiting sliding grooves 11 one by one.

[0034] In this embodiment, a plurality of arc-shaped limiting grooves 11 are at the same horizontal height and are distributed at intervals along the circumference, so the number and position of the limiting bosses 211 should also match the limiting grooves 11. When the limiting bosses 211 in different directions enter the corresponding limiting grooves 11, the bracket 21 can be limited from multiple directions. In addition, when subjected to external force, each limiting groove 11 can share the force together, avoiding structural damage caused by excessive local force. In other embodiments, the limiting groove 11 can also be constructed in an annular shape, and a plurality of limiting bosses 211 arranged at intervals are provided on the bracket 21, and the plurality of limiting bosses 211 are all installed in the annular limiting groove 11, and the number and position of the notches 12 match the limiting bosses 211.

[0035] The protective structure also includes a positioning component, which includes a locking groove 14 and a clamping platform 236. One of the locking groove 14 and the clamping platform 236 is set on the bearing seat 1, and the other is set on the protective cover. When the clamping platform 236 extends into the locking groove 14, it can limit the relative rotation of the protective cover and the bearing seat 1.

[0036] In this embodiment, the positioning assembly includes a latching slot 14 and a latching platform 236, which cooperate with each other. When the latching platform 236 extends into the latching slot 14, it restricts relative rotation between the protective cover and the bearing seat 1, thereby limiting relative rotation between the protective assembly 2 and the bearing seat 1. The latching slot 14 and latching platform 236 have a relatively simple structure, lacking complex mechanical components and electronic elements, and thus provide high reliability. When the latching platform 236 is disengaged from the latching slot 14, the protective cover can rotate relative to the bearing seat 1, enabling rapid switching of the protective cover angle and facilitating user convenience.

[0037] The protective cover includes a cover body 22 having a first mounting hole 221 and a base 23 having a second mounting hole 231. The cover body 22 is fixedly connected to the base 23. The first mounting hole 221 and the second mounting hole 231 are opposite to each other to form a mounting channel. The bearing seat 1 has a plurality of locking grooves 14 along its circumference on one side facing the base 23. The base 23 has a plurality of latching platforms 236 distributed along its circumference on one side close to the bearing seat 1. The latching platforms 236 correspond one-to-one to the locking grooves 14.

[0038] In this embodiment, a first mounting hole 221 is provided on the cover 22, and a second mounting hole 231 is provided on the base 23. The cover 22 is fixedly connected to the base 23, and the first mounting hole 221 and the second mounting hole 231 are arranged relative to each other, together forming a mounting channel for the bearing seat 1 to pass through. The cover 22 and the base 23 can be an integral structure or a split structure. The bearing seat 1 has a plurality of locking grooves 14 along its circumference on the side facing the base 23, and the base 23 has a plurality of latches 236 distributed along its circumference on the side close to the bearing seat 1. The latches 236 correspond one-to-one with the locking grooves 14, that is, each latch 236 has a corresponding locking groove 14 to match it, ensuring that during the installation process, the latches 236 can be accurately inserted into the corresponding locking groove 14 to achieve precise positioning, thereby avoiding installation difficulties or inaccurate positioning caused by the mismatch between the latches 236 and the locking grooves 14. By distributing the locking grooves 14 and the retaining plates 236 along the circumference, they can position and secure the bearing seat 1 and base 23 at multiple locations. Furthermore, the multiple circumferential retaining points evenly distribute the applied force, reducing localized stress concentration. In other embodiments, the locking grooves 14 can also be provided on the base 23, in which case the retaining plates 236 should be provided on the bearing seat 1.

[0039] like Figure 3 、 Figure 4 and Figure 5As shown, the base 23 has an annular mounting groove 232 along its circumference, and an elastic member 233 is provided in the annular mounting groove 232. The base 23 is relatively slidably connected to the bracket 21 in the axial direction, and the elastic member 233 can keep the base 23 moving toward the bearing seat 1.

[0040] In this embodiment, the base 23 is provided with an annular mounting groove 232 along its own circumference. The annular structure can be evenly distributed around the base 23, so that the elastic member 233 subsequently installed therein can exert a force on the base 23 in all directions, ensuring the uniformity of the force application and avoiding the tilt or offset of the base 23 due to local uneven force. When the base 23 and the bearing seat 1 are in a relative position, the elastic member 233 will keep the base 23 moving toward the bearing seat 1 due to its own elasticity. Specifically, if the base 23 and the bearing seat 1 are subjected to an external force so that the base 23 moves away from the bearing seat 1, the elastic member 233 will be stretched or compressed, thereby generating an elastic force in the opposite direction of the base 23 moving away from the bearing seat 1. When the external force disappears, the base 23 is urged to move closer to the bearing seat 1 until the base 23 is reset. When the angle of the cover body 22 needs to be adjusted, an external force is applied to the cover body 22 (in this embodiment, it means pressing the cover body 22 downward) to overcome the restoring force of the elastic member 233, so that the base 23 moves, and the bracket 236 is then disengaged from the locking groove 14. At this time, the cover body 22 can be freely rotated to the desired angle. It should be noted that the pressing stroke of the elastic member 233 needs to be greater than the height of the boss of the bearing seat 1. After the angle adjustment of the cover body 22 is completed, the external force is removed, and the elastic member 233 begins to restore the deformation. The restoring force generated pushes the base 23 to move to the initial position. As the base 23 moves, the bracket 236 is automatically inserted into the corresponding locking groove 14 under the action of the elastic member 233. The engagement of the bracket 236 with the locking groove 14 limits the rotation of the cover body 22 and prevents its angle from changing arbitrarily.

[0041] A ball 234 and a gasket 235 are provided in the annular mounting groove 232. The ball 234 is located at the bottom of the annular mounting groove 232. The gasket 235 is located on the side of the ball 234 close to the elastic member 233. One end of the elastic member 233 abuts against the gasket 235, and the other end abuts against the side of the bracket 21 close to the bearing seat 1.

[0042] In this embodiment, ball bearings 234 are located at the bottom of annular mounting groove 232 and are typically made of a high-hardness, wear-resistant material, such as a steel ball. Ball bearings 234 convert sliding friction into rolling friction, reducing friction during rotation of base 23 and improving flexibility. A gasket 235 is provided on the side of ball bearings 234 near elastic member 233 to provide isolation and cushioning, preventing direct contact between ball bearings 234 and elastic member 233, thereby avoiding wear on elastic member 233 caused by the rolling of ball bearings 234 and preventing ball bearings 234 from becoming lodged in elastic member 233.

[0043] The bracket 21 includes a third mounting hole 212, a limiting portion 213 and a supporting portion 214 from the inside to the outside; the limiting boss 211 extends from the limiting portion 213 toward the center of the third mounting hole 212, the supporting portion 214 is clamped between the cover body 22 and the base 23, and the limiting portion 213 is passed through the first mounting hole 221.

[0044] In this embodiment, the bracket 21 includes a third mounting hole 212, a limiting portion 213 and a supporting portion 214 from the inside to the outside. The third mounting hole 212 is used for coaxial installation with the bearing seat 1 to ensure that the bracket 21 can rotate around the bearing seat 1. The limiting portion 213 is passed through the first mounting hole 221 of the cover body 22 to play a role in positioning and preliminary fixation. The limiting boss 211 extends from the limiting portion 213 toward the center of the third mounting hole 212 to facilitate connection with the limiting slide 11 of the bearing seat 1. The supporting portion 214 is clamped between the cover body 22 and the base 23, that is, the bracket 21 is fixed between the cover body 22 and the base 23, and the cover body 22 and the base 23 are fixed, so the positions of the bracket 21, the cover body 22 and the base 23 are relatively fixed along the axial direction.

[0045] The cover 22 includes a bottom plate 222 having a semicircular or fan-shaped structure and a surrounding frame 223 provided on the outer edge of the bottom plate 222 . The surrounding frame 223 extends toward a side of the bottom plate 222 away from the bearing seat 1 .

[0046] In this embodiment, the bottom plate 222 of the cover 22 is constructed in a semicircular or fan-shaped configuration, which better conforms to the shape of the angle grinder's working head and provides protection. A frame 223 is provided on the outer edge of the bottom plate 222, extending toward the side of the bottom plate 222 away from the bearing seat 1. The frame 223 enhances the three-dimensional protection of the cover 22, preventing objects from entering the protected area from the side.

[0047] This embodiment also provides an angle grinder, which includes any one of the aforementioned protective structures.

[0048] The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modifications that do not deviate from the functional and structural principles of the present invention are intended to be included within the scope of the claims.

Claims

1. A protective structure comprising a bearing seat (1) and a protective assembly (2), characterized in that: The protective assembly (2) includes a protective cover and a bracket (21) rotatably connected to the protective cover, the protective cover is provided with an installation channel for the bearing seat (1) to pass through, the bracket (21) is provided with a limiting boss (211), the surface of the bearing seat (1) is provided with a limiting groove (11) along its own circumference for sliding cooperation with the limiting boss (211), the end surface of the bearing seat (1) close to the protective cover is provided with a notch (12) for the limiting boss (211) to pass through and enter the limiting groove (11), when the bracket (21) is rotated until the limiting boss (211) is located in the limiting groove (11) and is offset from the notch (12), the protective cover is axially fixed to the bearing seat (1), and when the bracket (21) is rotated until the limiting boss (211) is opposite to the notch (12), the protective cover can be separated from the bearing seat (1) along the axial direction.

2. A protective structure according to claim 1, characterized in that: A guide groove (13) is provided on the surface of the bearing seat (1) along its own axial direction, one end of the guide groove (13) extends to the notch (12), and the other end extends to the limiting sliding groove (11).

3. A protective structure according to claim 1, characterized in that: The limiting slide groove (11) is constructed in an arc shape and is configured as a plurality of limiting slide grooves (11), wherein the plurality of limiting slide grooves (11) are distributed at intervals along the circumference of the bearing seat (1), and the notches (12) correspond one-to-one to the limiting slide grooves (11).

4. A protective structure according to any one of claims 1 to 3, characterized in that: The invention also includes a positioning component, which includes a locking groove (14) and a clamping platform (236). One of the locking groove (14) and the clamping platform (236) is arranged on the bearing seat (1), and the other is arranged on the protective cover. When the clamping platform (236) extends into the locking groove (14), it can limit the relative rotation of the protective cover and the bearing seat (1).

5. A protective structure according to claim 4, characterized in that: The protective cover includes a cover body (22) having a first mounting hole (221) and a base (23) having a second mounting hole (231), the cover body (22) is fixedly connected to the base (23), the first mounting hole (221) and the second mounting hole (231) are opposite to each other to form the mounting channel, the bearing seat (1) is provided with a plurality of locking grooves (14) along its circumference on one side facing the base (23), and the base (23) is provided with a plurality of clamping platforms (236) along its circumference on one side close to the bearing seat (1), and the clamping platforms (236) correspond one-to-one to the locking grooves (14).

6. A protective structure according to claim 5, characterized in that: The base (23) is provided with an annular mounting groove (232) along its circumference, and an elastic member (233) is provided in the annular mounting groove (232). The base (23) and the bracket (21) are relatively slidably connected in the axial direction, and the elastic member (233) can enable the base (23) to maintain a tendency to move toward the bearing seat (1).

7. A protective structure according to claim 6, characterized in that: A ball (234) and a gasket (235) are provided in the annular mounting groove (232), the ball (234) is located at the bottom of the annular mounting groove (232), the gasket (235) is located on a side of the ball (234) close to the elastic member (233), one end of the elastic member (233) abuts against the gasket (235), and the other end abuts against a side of the bracket (21) close to the bearing seat (1).

8. The protective structure according to claim 5, characterized in that: The bracket (21) comprises, from the inside to the outside, a third mounting hole (212), a limiting portion (213), and a supporting portion (214); the limiting boss (211) extends from the limiting portion (213) toward the center of the third mounting hole (212); the supporting portion (214) is sandwiched between the cover body (22) and the base (23); and the limiting portion (213) is passed through the first mounting hole (221).

9. The protective structure according to claim 5, characterized in that: The cover (22) comprises a bottom plate (222) constructed in a semicircular or fan-shaped manner and a surrounding frame (223) arranged on the outer edge of the bottom plate (222), and the surrounding frame (223) extends toward a side of the bottom plate (222) away from the bearing seat (1).

10. An angle grinder, characterized in that: The angle grinder comprises the protective structure according to any one of claims 1 to 9.

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