Angle grinder

Abstract

The embodiment of the utility model discloses an angle grinder which comprises a bearing seat, a protective cover and a connecting rod mechanism. Wherein a locking hole is formed in the bearing seat. The protective cover is detachably installed on the bearing seat, and a positioning hole opposite to the locking hole is formed in the protective cover. The connecting rod mechanism comprises an operating rod rotationally installed on the bearing seat through a first rotating shaft, a locking rod rotationally installed on the bearing seat through a second rotating shaft, and a connecting rod rotationally installed between the operating rod and the locking rod. The operating rod rotates around the first rotating shaft in the preset direction so that the angle grinder can be switched from the first state to the second state, and in the first state, the locking rod is partially inserted into the positioning hole and the locking hole; and in the second state, the locking rod is separated from the positioning hole and the locking hole. Through the design of the connecting rod mechanism, replacement or angle change of the protective cover is achieved; movement interference cannot be generated between the operating rod and the locking rod, the shield is convenient to disassemble and assemble, operation is convenient, and the user experience feeling is good.

Description

Technical Field

[0001] The utility model relates to the technical field of electric tools, in particular to an angle grinder. Background Art

[0002] Angle grinders are mainly used for cutting, grinding and brushing products. Sand and dust will be generated during the grinding process, and a half shield is required to limit the dispersion of sand and dust. In the cutting process, a closed shield is required. Therefore, operators can choose different shields according to different usage scenarios. The existing operation of replacing the shield is cumbersome and inconvenient to disassemble and assemble, resulting in reduced work efficiency of users.

[0003] Therefore, in view of the above-mentioned technical problems, it is necessary to provide an angle grinder.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0005] In view of this, an object of the present invention is to provide an angle grinder.

[0006] In order to achieve the above purpose, the technical solution provided by an embodiment of the present utility model is as follows:

[0007] An angle grinder, comprising:

[0008] A bearing seat, wherein a locking hole is provided on the bearing seat;

[0009] A shield is detachably mounted on the bearing seat, and a positioning hole is provided on the shield to be aligned with the locking hole;

[0010] A connecting rod mechanism, comprising an operating rod rotatably mounted on the bearing seat via a first rotating shaft, a locking rod rotatably mounted on the bearing seat via a second rotating shaft, and a connecting rod rotatably mounted between the operating rod and the locking rod;

[0011] The operating rod rotates around the first rotating shaft in a preset direction to switch the angle grinder from a first state to a second state. In the first state, the locking rod is partially inserted into the positioning hole and the locking hole; in the second state, the locking rod is disengaged from the positioning hole and the locking hole.

[0012] In one or more embodiments of the present invention, a first mounting hole for mounting the first rotating shaft is provided between the first end and the second end of the operating rod, a second mounting hole for mounting the second rotating shaft is provided between the first end and the second end of the locking rod, and the two ends of the connecting rod are respectively rotatably mounted on the second end of the operating rod and the second end of the locking rod.

[0013] In one or more embodiments of the present invention, the angle grinder also includes a torsion spring, which is sleeved on the first rotating shaft, the first end of the torsion spring abuts against the bearing seat, and the second end of the torsion spring abuts against the operating rod, so that the torsion spring can generate a torque that causes the operating rod to rotate in the opposite direction of the preset direction.

[0014] In one or more embodiments of the present utility model, the angle grinder further comprises:

[0015] A self-locking member, wherein the bearing seat is provided with a first assembly hole, and the self-locking member is partially installed in the first assembly hole;

[0016] A head shell, wherein the head shell is provided with a second assembly hole coaxially arranged with the first assembly hole, and the bearing seat is fixedly mounted on the head shell;

[0017] A reset member, one end of which is in contact with the head shell, and the other end of which is in contact with the self-locking member, and the reset member has a tendency to move the self-locking member away from the head shell;

[0018] In the first state or the second state, the operating rod abuts against the self-locking member.

[0019] In one or more embodiments of the present utility model, the self-locking member includes a guiding inclined surface arranged away from the locking rod and a self-locking surface arranged toward the locking rod;

[0020] In the first state, the operating rod abuts against the guiding inclined surface;

[0021] In the second state, the operating rod abuts against the self-locking surface.

[0022] In one or more embodiments of the present invention, the guiding slope is used to convert the rotation of the operating rod along a preset direction into the movement of the self-locking member toward the head shell.

[0023] In one or more embodiments of the present invention, the self-locking member includes a rod body installed in the first assembly hole and a stop portion located on a side of the bearing seat away from the head shell.

[0024] In one or more embodiments of the utility model, a limit block is provided on the rod body, a first limit groove matching with the limit block is provided on the hole wall of the first assembly hole, and a second limit groove matching with the limit block is provided on the hole wall of the second assembly hole.

[0025] In one or more embodiments of the present invention, the angle grinder further comprises a first bushing sleeved on the first rotating shaft and a second bushing sleeved on the second rotating shaft, the operating rod is rotatably mounted on the first bushing, and the locking rod is rotatably mounted on the second bushing.

[0026] In one or more embodiments of the utility model, a limiting protrusion is extended inwardly on the inner wall of the shield, and a mounting groove and a movable ring groove connected to the mounting groove are provided on the outer wall of the bearing seat. In the second state, the limiting protrusion moves in the movable ring groove.

[0027] In one or more embodiments of the present invention,

[0028] Compared with the prior art, the embodiment of the utility model provides an angle grinder, which can drive the locking rod to move through the operating rod of the connecting rod mechanism, so that the locking rod can be separated from the positioning hole and the locking hole or partially inserted, so as to realize the replacement of the guard or the change of the angle; there will be no motion interference between the operating rod and the locking rod, the guard is easy to disassemble and assemble, the operation is convenient, the angle grinder has a simple structure, and the user experience is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a three-dimensional structural schematic diagram of an angle grinder according to an embodiment of the utility model;

[0030] Figure 2 It is a schematic diagram of the exploded structure of an angle grinder according to an embodiment of the utility model;

[0031] Figure 3 It is a schematic diagram of the three-dimensional structure of a bearing seat according to an embodiment of the utility model;

[0032] Figure 4 It is a schematic diagram of the three-dimensional structure of a protective cover according to an embodiment of the utility model;

[0033] Figure 5 It is a three-dimensional structural schematic diagram of a connecting rod mechanism according to an embodiment of the utility model;

[0034] Figure 6 It is a schematic diagram of the front view of the angle grinder without a protective cover installed in a first state according to an embodiment of the utility model;

[0035] Figure 7It is a schematic diagram of the front view of the angle grinder without the protective cover installed in the second state according to one embodiment of the utility model;

[0036] Figure 8 It is a schematic diagram of a three-dimensional structure at a first angle of an angle grinder without a protective cover installed in a first state according to an embodiment of the utility model;

[0037] Fig. 9 yes Figure 8 A magnified view of the local structure at point A in the middle;

[0038] Fig.10 is a schematic diagram of the three-dimensional structure of an operating rod according to an embodiment of the utility model;

[0039] Fig.11 It is a three-dimensional structural schematic diagram of a self-locking member according to an embodiment of the utility model;

[0040] Fig.12 yes Figure 6 Schematic diagram of the cross-sectional structure at AA in the middle;

[0041] Fig.13 yes Figure 6 Schematic diagram of the cross-sectional structure at the middle BB;

[0042] Fig.14 It is a schematic diagram of the three-dimensional structure at a second angle of an angle grinder without a protective cover installed in a first state according to an embodiment of the utility model. DETAILED DESCRIPTION

[0043] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0044] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0045] Reference Figure 1 to Figure 7As shown, an angle grinder in a specific embodiment of the present invention includes a bearing seat 1, a shield 2, and a connecting rod mechanism 3. A locking hole 11 is provided on the bearing seat 1. The shield 2 is detachably mounted on the bearing seat 1, and a positioning hole 221 is provided on the shield 2, which is aligned with the locking hole 11. The connecting rod mechanism 3 includes an operating rod 31 rotatably mounted on the bearing seat 1 through a first rotating shaft 41, a locking rod 32 rotatably mounted on the bearing seat 1 through a second rotating shaft 42, and a connecting rod 33 rotatably mounted between the operating rod 31 and the locking rod 32. The operating rod 31 rotates around the first rotating shaft 41 in a preset direction so that the angle grinder switches from a first state to a second state. In the first state, the locking rod 32 is partially inserted into the positioning hole 221 and the locking hole 11; in the second state, the locking rod 32 is disengaged from the positioning hole 221 and the locking hole 11. The first rotating shaft 41 and the second rotating shaft 42 can be structures such as screws, threaded rods, and screws.

[0046] According to this design, the shield 2 can be fixed to the bearing seat 1 through the connecting rod mechanism 3, which simplifies the steps of assembling the shield 2. It only needs to apply external force to the operating rod 31 to make it rotate around the first rotating shaft 41, and the shield 2 can be installed on the bearing seat 1 or removed from the bearing seat 1 through the locking rod 32, which is conducive to quick and easy disassembly and assembly of the shield 2.

[0047] Among them, refer to Figure 5 to Figure 7 As shown, the locking rod 32 includes a locking rod body 321 connected to the second rotating shaft 42 and a locking block 322 extending toward the bearing seat 1. The locking block 322 can be inserted into the positioning hole 221 and the locking hole 11 in the first state, and separated from the positioning hole 221 and the locking hole 11 in the second state.

[0048] Specifically, refer to Figure 5 to Figure 7As shown, in this embodiment, a first mounting hole 3111 for mounting the first rotating shaft 41 is provided between the first end and the second end of the operating rod 31, a second mounting hole 3211 for mounting the second rotating shaft 42 is provided between the first end and the second end of the locking rod 32, and both ends of the connecting rod 33 are rotatably mounted on the second end of the operating rod 31 and the second end of the locking rod 32, respectively, that is, the first end of the connecting rod 33 and the second end of the operating rod 31 are hingedly mounted, and the second end of the connecting rod 33 and the second end of the operating rod 31 are hingedly mounted. When the control operating rod 31 is rotated along the preset direction around the first rotating shaft 41, so that the angle grinder switches from the first state to the second state, the first end of the operating rod 31 moves toward the bearing seat 1, and the second end of the operating rod 31 moves away from the bearing seat 1, and the angle between the operating rod 31 and the connecting rod 33 gradually decreases. The second end of the locking rod 32 moves toward the bearing seat 1 driven by the connecting rod 33, thereby driving the locking rod 32 to rotate around the second rotating shaft 42, and the first end of the locking rod 32 moves away from the bearing seat 1, and the angle between the locking rod 32 and the connecting rod 33 gradually increases, so that the locking rod 32 can be disengaged from the positioning hole 221 and the locking hole 11, and the shield 2 can be removed from the bearing seat 1. When the operating rod 31 is controlled to rotate around the first rotating shaft 41 in the opposite direction of the preset direction, so that the angle grinder switches from the second state to the first state, the first end of the operating rod 31 moves away from the bearing seat 1, and the second end of the operating rod 31 moves toward the bearing seat 1. The angle between the operating rod 31 and the connecting rod 33 gradually increases, and the second end of the locking rod 32 moves away from the bearing seat 1 under the drive of the connecting rod 33, thereby driving the locking rod 32 to rotate around the second rotating shaft 42, and the first end of the locking rod 32 moves toward the bearing seat 1. The angle between the locking rod 32 and the connecting rod 33 gradually decreases, so that the locking rod 32 can be partially inserted into the positioning hole 221 and the locking hole 11, and the shield 2 can be fixedly installed on the bearing seat 1. According to this design, there is no motion interference between the locking rod 32 and the operating rod 31, the shield 2 is easy to disassemble and assemble, easy to operate, and the user experience is good.

[0049] In the process of switching the angle grinder from the first state to the second state, the user applies an external force to the first end of the operating rod 31 to control the operating rod 31 to rotate around the first rotating shaft 41 in a preset direction. Figure 2 Combined with Figure 8 to Figure 10As shown, the angle grinder in this embodiment also includes a torsion spring 5, which is sleeved on the first rotating shaft 41, the first end of the torsion spring 5 abuts on the bearing seat 1, and the second end of the torsion spring 5 abuts on the operating rod 31, so that the torsion spring 5 can form a torsion force that causes the operating rod 31 to rotate in the opposite direction of the preset direction. When the user controls the operating rod 31 to rotate in the preset direction, the torsion spring 5 is elastically deformed, and elastic potential energy is formed in the torsion spring 5. When the user releases the external force applied to the first end of the operating rod 31, the elastic potential energy is released to form a torsion force, which drives the operating rod 31 to rotate in the opposite direction of the preset direction. According to this design, there is no need to control the operating rod 31 to rotate in the opposite direction of the preset direction by applying an external force to the first end of the operating rod 31, which saves time and effort and is convenient to operate. Among them, a slot 3112 is provided on the operating rod 31, a contact groove 14 is provided on the bearing seat 1, and the torsion spring 5 includes an elastic body 51 sleeved on the first rotating shaft 41 and a first elastic arm 52 and a second elastic arm 53 located at both ends of the elastic body 51 and extending outward. The extended end of the first elastic arm 52 is abutted against the abutment groove 14, and the extended end of the second elastic arm 53 is inserted into the slot 3112 of the operating rod 31 and abuts against the main body of the operating rod 31.

[0050] In order to allow the locking rod 32 to be partially stably and securely inserted into the positioning hole 221 and the locking hole 11 in the first state, so that the shield 2 is stably and securely fixed on the bearing seat 1, or to prevent the locking rod 32 from being inserted into the positioning hole 221 and the locking hole 11 in the second state to hinder the disassembly and assembly of the shield 2, refer to Figure 2 Combined with Fig.11 , Fig.12 As shown, the angle grinder in this embodiment further includes a self-locking member 6, a head shell 7 and a reset member 8. Among them, a first assembly hole 15 is provided on the bearing seat 1, and the self-locking member 6 is partially installed in the first assembly hole 15; a second assembly hole 71 coaxially arranged with the first assembly hole 15 is provided on the head shell 7, and the bearing seat 1 is fixedly installed on the head shell 7; one end of the reset member 8 abuts against the head shell 7, and the other end of the reset member 8 abuts against the self-locking member 6, and the reset member 8 has a tendency to make the self-locking member 6 away from the head shell 7; in the first state or the second state, the operating rod 31 abuts against the self-locking member 6.

[0051] Further, see Fig.11 , Fig.14 Combined with Figure 6 , Figure 7As shown, the self-locking member 6 in this embodiment includes a guide bevel 621 arranged away from the locking rod 32 and a self-locking surface 622 arranged toward the locking rod 32; in the first state, the operating rod 31 abuts against the guide bevel 621; in the second state, the operating rod 31 abuts against the self-locking surface 622. Preferably, the operating rod 31 in this embodiment includes an operating rod body 311 connected to the first rotating shaft 41 and an operating portion 312 arranged away from the second end of the operating rod 31. The user can apply an external force to the operating portion 312 to control the entire operating rod 31 to rotate in a predetermined direction. The operating portion 312 abuts against the guide bevel 621 in the first state, and abuts against the self-locking surface 622 in the second state. When the angle grinder is in the first state, since the operating rod 31 and the guiding bevel 621 are in contact with each other, when no external force is applied to the operating rod 31, the guiding bevel 621 limits the rotation of the operating rod 31, and the operating rod 31 cannot rotate in the preset direction. Moreover, since the locking rod 32 is partially inserted in the positioning hole 221 and the locking hole 11, the locking rod 32 cannot be further rotated toward the bearing seat 1, and the operating rod 31 cannot be rotated away from the bearing seat 1. Therefore, the locking rod 32 cannot be separated from the positioning block and the locking hole 11 under the drive of the operating rod 31, and the shield 2 can be stably and securely fixed on the bearing seat 1. When the angle grinder is in the second state, since the operating rod 31 and the self-locking surface 622 are in contact, the self-locking surface 622 limits the angle of rotation of the operating rod 31 in the opposite direction of the preset direction, and the operating rod 31 can rotate freely. During the free rotation of the operating rod 31, the locking rod 32 will also rotate in coordination. However, due to the existence of the self-locking surface 622, the operating rod 31 cannot drive part of the locking rod 32 to extend into the positioning hole 221 and the locking hole 11, so the shield 2 can be removed from the bearing seat 1. According to this design, the angle grinder can be kept in the first state or the second state more stably and reliably, which is conducive to the disassembly and assembly of the shield 2 on the bearing seat 1.

[0052] In order to facilitate the user to apply external force to the operating rod 31 to drive the operating rod 31 to rotate in a predetermined direction without being restricted by the guide inclined surface 621, Fig.11 As shown, the guide slope 621 in this embodiment is used to convert the rotation of the operating rod 31 in a preset direction into the movement of the self-locking member 6 toward the head shell 7. Specifically, the guide slope 621 is in the shape of a long strip, and the guide surface has a first side close to the bearing seat 1 and a second side away from the bearing seat 1. From the first side to the second side, the distance between the guide surface and the bearing seat 1 gradually decreases. According to this design, the operating rod 31 is always in contact with the guide slope 621, and the self-locking member 6 can be partially retracted into the receiving hole formed by the combination of the first assembly hole 15 and the second assembly hole 71.

[0053] Specifically, refer to Fig.11 , Fig.12As shown, the self-locking member 6 in this embodiment includes a rod body 61 installed in the first assembly hole 15 and a stop portion 62 located on the side of the bearing seat 1 away from the head shell 7, the guide slope 621 and the self-locking surface 622 are located on the stop portion 62, and the operating portion 312 of the operating rod 31 can abut against the stop portion 62 of the self-locking member 6. The self-locking member 6 can be fixedly installed on the bearing seat 1 by inserting the rod body 61 into the first assembly hole 15. There is a certain distance between the stop portion 62 and the bearing seat 1, so as to prevent the stop portion 62 from colliding with the outer wall of the bearing seat 1 when the stop member moves toward the bearing seat 1.

[0054] Preferably, a stop block 611 is provided on the rod body 61 in this embodiment, a first stop groove 151 matching with the stop block 611 is provided on the hole wall of the first assembly hole 15, and a second stop groove 711 matching with the stop block 611 is provided on the hole wall of the second assembly hole 71. According to this design, the self-locking member 6 in this embodiment can be accurately aligned and installed more quickly; and the self-locking member 6 can be prevented from rotating when the rod body 61 moves to the first assembly hole 15 or the second assembly hole 71 through the cooperation of the stop block 611 and the first stop groove 151 or the stop block 611 and the second stop groove 711 when the rod body 61 moves to the first assembly hole 15 or the second assembly hole 71.

[0055] Further, see Fig.11 , Fig.12 As shown, the angle grinder in this embodiment also includes a reset member 8 located in the second assembly hole 71, one end of the reset member 8 abuts against the head shell 7, and the other end of the reset member 8 abuts against the self-locking member 6, and the reset member 8 has a tendency to make the self-locking member 6 away from the head shell 7. Among them, the reset member 8 can be a structure that can provide elastic force such as a spring or a shrapnel, which can be understood and accepted by those skilled in the art. When the user applies an external force to the operating rod 31, the operating rod 31 abuts against the guide inclined surface 621 during the process of rotating in a preset direction, and the external force forms a first component force driving the operating rod 31 to rotate and a second component force driving the self-locking member 6 to move toward the head shell 7 at the abutment. When the self-locking member 6 moves toward the head shell 7, the reset member 8 is compressed and contracted, and a reset force is formed in the reset member 8. Until the operating rod 31 rotates to separate from the guide inclined surface 621, the self-locking member 6 can move away from the head shell 7 under the reset force of the reset member 8 and return to the initial state. According to this design, the operating rod 31 is conveniently brought into contact with the self-locking surface 622 in the second state.

[0056] Reference Figure 1 Combined with Fig.14As shown, in order to protect the first rotating shaft 41 and the second rotating shaft 42, and to reduce the wear, vibration and noise between the first rotating shaft 41 and the operating rod 31, and between the second rotating shaft 42 and the locking rod 32, the angle grinder in this embodiment further includes a first bushing 91 sleeved on the first rotating shaft 41 and a second bushing 92 sleeved on the second rotating shaft 42, the operating rod 31 is rotatably mounted on the first bushing 91, and the locking rod 32 is rotatably mounted on the second bushing 92. The first bushing 91 is provided with an avoidance groove 911 for the second elastic arm 53 of the bezoar to pass through, so that the extended end of the second elastic arm 53 passes through the avoidance groove 911 and is inserted into the slot 3112 of the operating rod 31 to abut against the main body of the operating rod 31.

[0057] In order to facilitate the installation of the shield 2 on the bearing seat 1, refer to Figure 3 , Figure 4 Combined with Figure 6 , Figure 7 As shown, the shield 2 in this embodiment includes a shield body 21 and a mounting portion 22 mounted on the bearing seat 1, and a positioning hole 221 is provided on the mounting portion 22. Among them, a limiting protrusion 222 is provided on the inner wall of the shield 2 in this embodiment, extending inward, and the limiting protrusion 222 is located on the mounting portion 22. The outer wall of the bearing seat 1 is provided with a mounting groove 12 and a movable ring groove 13 connected to the mounting groove 12. In the second state, the limiting protrusion 222 moves in the movable ring groove 13. When the shield 2 is installed on the bearing seat 1, the limiting protrusion 222 of the shield 2 needs to be aligned with the mounting groove 12 on the bearing seat 1. When the shield 2 moves toward the bearing seat 1 for assembly, the limiting protrusion 222 moves in the mounting groove 12 until the limiting protrusion 222 moves into the movable ring groove 13. The shield 2 can be rotated along the axial direction of the bearing seat 1 to change the angle of the shield 2 so that the positioning hole 221 on the shield 2 cooperates with the locking hole 11, so that the shield 2 can be installed on the bearing seat 1 by inserting the locking rod 32 of the connecting rod mechanism 3 into the positioning hole 221 and the locking hole 11.

[0058] It can be seen from the above technical solutions that the utility model has the following beneficial effects:

[0059] The embodiment of the utility model provides an angle grinder, which can drive the locking rod to move through the operating rod of the connecting rod mechanism, so that the locking rod can be separated from the positioning hole and the locking hole or partially inserted, so as to realize the replacement of the protective cover or the change of the angle; there will be no movement interference between the operating rod and the locking rod, the protective cover is convenient to disassemble and assemble, the operation is convenient, the angle grinder has a simple structure, and the user experience is good.

[0060] The foregoing description of specific exemplary embodiments of the utility model is for the purpose of illustration and illustration. These descriptions are not intended to limit the utility model to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the utility model and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the utility model and various different options and changes. The scope of the utility model is intended to be defined by the claims and their equivalents.

Claims

1. An angle grinder, characterized in that: The angle grinder comprises: A bearing seat (1), wherein the bearing seat (1) is provided with a locking hole (11); A shield (2) is detachably mounted on the bearing seat (1), and a positioning hole (221) is provided on the shield (2) and is aligned with the locking hole (11); A connecting rod mechanism (3), comprising an operating rod (31) rotatably mounted on the bearing seat (1) via a first rotating shaft (41), a locking rod (32) rotatably mounted on the bearing seat (1) via a second rotating shaft (42), and a connecting rod (33) rotatably mounted between the operating rod (31) and the locking rod (32); The operating rod (31) rotates around the first rotating shaft (41) in a preset direction so that the angle grinder switches from a first state to a second state. In the first state, the locking rod (32) is partially inserted into the positioning hole (221) and the locking hole (11); in the second state, the locking rod (32) is disengaged from the positioning hole (221) and the locking hole (11).

2. The angle grinder according to claim 1, characterized in that: A first mounting hole (3111) for mounting the first rotating shaft (41) is provided between the first end and the second end of the operating rod (31), a second mounting hole (3211) for mounting the second rotating shaft (42) is provided between the first end and the second end of the locking rod (32), and both ends of the connecting rod (33) are rotatably mounted on the second end of the operating rod (31) and the second end of the locking rod (32), respectively.

3. The angle grinder according to claim 1, characterized in that: The angle grinder further comprises a torsion spring (5), wherein the torsion spring (5) is sleeved on the first rotating shaft (41), a first end of the torsion spring (5) abuts against the bearing seat (1), and a second end of the torsion spring (5) abuts against the operating rod (31), so that the torsion spring (5) can generate a torsion force that causes the operating rod (31) to rotate in a direction opposite to the preset direction.

4. The angle grinder according to claim 1, characterized in that: The angle grinder also includes: A self-locking member (6), wherein a first assembly hole (15) is provided on the bearing seat (1), and the self-locking member (6) is partially installed in the first assembly hole (15); A head shell (7), wherein the head shell (7) is provided with a second assembly hole (71) coaxially arranged with the first assembly hole (15), and the bearing seat (1) is fixedly mounted on the head shell (7); a reset member (8), one end of the reset member (8) being in contact with the head shell (7), and the other end of the reset member (8) being in contact with the self-locking member (6), and the reset member (8) having a tendency to move the self-locking member (6) away from the head shell (7); In the first state or the second state, the operating rod (31) abuts against the self-locking member (6).

5. The angle grinder according to claim 4, characterized in that: The self-locking member (6) comprises a guiding inclined surface (621) arranged away from the locking rod (32) and a self-locking surface (622) arranged toward the locking rod (32); In the first state, the operating rod (31) abuts against the guiding inclined surface (621); In the second state, the operating rod (31) abuts against the self-locking surface (622).

6. The angle grinder according to claim 5, characterized in that The guiding inclined surface (621) is used to convert the rotation of the operating rod (31) in a preset direction into the movement of the self-locking member (6) toward the head shell (7).

7. The angle grinder according to claim 4, characterized in that: The self-locking member (6) comprises a rod body (61) installed in the first assembly hole (15) and a stop portion (62) located on a side of the bearing seat (1) away from the head shell (7).

8. The angle grinder according to claim 7, characterized in that: A limiting block (611) is provided on the rod body (61), a first limiting groove (151) matching with the limiting block (611) is provided on the hole wall of the first assembly hole (15), and a second limiting groove (711) matching with the limiting block (611) is provided on the hole wall of the second assembly hole (71).

9. The angle grinder according to claim 1, characterized in that: The angle grinder further comprises a first bushing (91) sleeved on the first rotating shaft (41) and a second bushing (92) sleeved on the second rotating shaft (42); the operating rod (31) is rotatably mounted on the first bushing (91); and the locking rod (32) is rotatably mounted on the second bushing (92).

10. The angle grinder according to claim 1, characterized in that: A limiting protrusion (222) is provided on the inner wall of the shield (2) extending inwardly, and a mounting groove (12) and a movable ring groove (13) connected to the mounting groove (12) are provided on the outer wall of the bearing seat (1). In the second state, the limiting protrusion (222) moves in the movable ring groove (13).

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