Angle grinder with anti-loosening structure

Abstract

The angle grinder comprises a grinder body and a driving motor arranged on the upper portion of an inner cavity of the grinder body, an output shaft of the driving motor is horizontally arranged left and right, the right end of the output shaft of the motor penetrates through the side wall of the grinder body, and the output shaft of the motor is rotationally connected with the side wall of the grinder body through a bearing. A threaded rod is coaxially fixed to the right end of the output shaft of the motor and coaxially sleeved with an abrasive disc, the left end face of the abrasive disc is tightly attached to the inner ring of the bearing, the right end face of the abrasive disc abuts against a nut arranged at the right end of the threaded rod, and the threaded rod is detachably connected with the nut through threads. A nut anti-loosening mechanism is further arranged at the right end of the nut and used for limiting rotation of the nut along the threads. The grinding disc can be tightly connected with the threaded rod through the nut in the working process through the nut anti-loosening mechanism, the grinding disc is prevented from loosening due to external force impact and rotation speed change, the service life of the grinding disc is prolonged, and the assembly efficiency of the grinding disc is improved.

Description

Technical Field

[0001] The utility model relates to the field of angle grinders, in particular to an angle grinder with an anti-loosening structure. Background Art

[0002] Angle grinder is a tool used for grinding, cutting, rust removal and polishing. It is often used in woodworking, electrical work and stone processing. The use of angle grinder not only improves work efficiency but also reduces people's labor intensity.

[0003] At present, the grinding disc of the angle grinder is locked on the output shaft of the angle grinder (rotated by the motor) through washers and nuts. Such an installation structure has the following defects: the grinding disc generates severe vibrations during the grinding process, which can easily loosen the nut and cause the grinding disc to fall off, affecting the grinding quality and grinding accuracy. At the same time, the falling off of the grinding disc during operation will also cause greater safety hazards.

[0004] The inventor knows an anti-loosening grinding disc installation mechanism for an angle grinder (202122905546.X), which includes an angle grinder housing and a driving shaft rod placed in the angle grinder housing, one end of the driving shaft rod passes through the angle grinder housing and is placed outside the angle grinder housing, and the end sleeve of the driving shaft rod is provided with a dust cover, and the dust cover is fixedly connected to the angle grinder housing, and the end of the driving shaft rod placed in the dust cover has a limit platform, and the limit platform is sequentially sleeved with a grinding disc, a first clamping plate, a clamping buckle and a second clamping plate, the first clamping plate, the second clamping plate The first clamping plate is threadedly connected to the limit platform, and the first clamping plate preliminarily clamps the grinding plate in the limit platform. The clamping buckle is set on the limit platform and axially clamps the first clamping plate and the grinding plate. The second clamping plate is screwed on the limit platform again to clamp the grinding plate in the limit platform. The first clamping plate is provided with a plurality of circular holes with equal circumference distribution. The clamping buckle includes a circular body and a plurality of rod bodies with equal circumference distribution placed on the circular body. The plurality of rod bodies are arranged corresponding to the plurality of circular holes in sequence, and the rod body of the clamping buckle passes through the circular holes under the axial clamping force of the second clamping plate and is in clamping contact with the end face of the grinding plate.

[0005] The above technology has at least the following technical problems:

[0006] First, the anti-loosening grinding disc installation mechanism is complex and difficult to disassemble. During the operation of the angle grinder, the change in speed can easily cause the threaded connection preload to be too large, making assembly difficult.

[0007] Secondly, a large number of non-standard parts are used for assembly in the anti-loosening grinding disc installation mechanism, which requires special disassembly and assembly tools during the disassembly process, increasing the difficulty of assembly. Utility Model Content

[0008] The purpose of the present utility model is to provide an angle grinder with a loosening prevention structure. Through the setting of the nut loosening prevention mechanism, the grinding disc can be tightly connected to the threaded rod by the nut during the working process, preventing the grinding disc from loosening due to external force impact and speed changes, and improving the service life and assembly efficiency of the grinding disc.

[0009] The present utility model adopts the following technical solutions:

[0010] An angle grinder with a loosening prevention structure includes a machine body and a driving motor arranged in the upper part of the inner cavity of the machine body. The output shaft of the driving motor is horizontally arranged left and right. The right end of the motor output shaft penetrates the side wall of the machine body, and the motor output shaft is rotatably connected to the side wall of the machine body through a bearing; a threaded rod is coaxially fixed to the right end of the motor output shaft. A grinding disc is coaxially sleeved outside the threaded rod. The left end face of the grinding disc is closely attached to the inner ring of the bearing, and the right end face of the grinding disc abuts against a nut arranged at the right end of the threaded rod. The threaded rod and the nut are detachably connected by threads; a nut loosening prevention mechanism is further arranged at the right end of the nut, and the nut loosening prevention mechanism is used to limit the nut from rotating along the thread.

[0011] Further, the nut loosening prevention mechanism includes a first limiting groove arranged left and right on the external thread of the circumferential surface of the threaded rod. The cross-section of the first limiting groove is semicircular. A second limiting groove corresponding to the internal thread on the inner wall of the nut is arranged, and the cross-section of the second limiting groove is semicircular corresponding to the cross-section of the first limiting groove; the nut loosening prevention mechanism includes a limiting pin inserted into a pin hole, and the limiting pin is cylindrical corresponding to the pin hole.

[0012] Further, the nut loosening prevention mechanism further includes a limiting ring arranged at the right end of the limiting pin. The limiting ring is coaxially sleeved on the right part of the threaded rod. The left end face of the limiting ring is connected to the right end of the limiting pin arranged along the circumferential direction of the threaded rod. A limiting buckle is radially penetrated along the right part of the threaded rod; the right end face of the limiting ring abuts against the outer side face of the limiting buckle.

[0013] Further, the left end of the limiting pin is conical, and a pre-tightening spring is arranged along the axial direction at the right end of the limiting pin. The left end of the pre-tightening spring is connected to the limiting pin, and the right end is connected to the limiting ring.

[0014] Further, a pre-tightening spring accommodation hole is arranged at the circumferential position corresponding to the limiting pin on the limiting ring. The pre-tightening spring is coaxially arranged in the pre-tightening spring accommodation hole and the right end is connected to the bottom surface of the pre-tightening spring accommodation hole. The limiting pin is slidably connected to the pre-tightening spring accommodation hole left and right.

[0015] Further, a through hole is arranged at the position where the threaded rod correspondingly penetrates the limiting buckle.

[0016] Further, the limiting buckle is of a V-shaped structure, and the limiting buckle uses an elastic material.

[0017] Further, the V-shaped structure of the limiting buckle includes a short support and a long support, and an arc-shaped protrusion towards the outside is arranged on the upper part of the long support.

[0018] Further, a plurality of groups of second limiting grooves are arranged circumferentially along the internal thread of the nut.

[0019] Further, a spring washer is coaxially arranged between the nut and the grinding disc.

[0020] The present invention can enable the grinding disc to be tightly connected to the threaded rod through the nut by means of the nut loosening prevention mechanism, prevent the grinding disc from loosening due to external force impact and speed change, and improve the service life and assembly efficiency of the grinding disc;

[0021] By providing a limiting pin with a conical left end, the torque range for installing the nut is broadened and the installation efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural view of the machine body in the present utility model;

[0023] Figure 2 is a schematic structural view of the bearing in the present utility model;

[0024] Figure 3 is a schematic structural view of the first limiting groove in the present utility model;

[0025] Figure 4 is a schematic structural view of the nut in the present utility model;

[0026] Figure 5 is a schematic structural view of the second limiting groove in the present utility model;

[0027] Figure 6 is a schematic structural view of the limiting pin in the present utility model;

[0028] Figure 7 is a schematic structural view of the pre-tightening spring accommodation hole in the present utility model;

[0029] Figure 8 is a schematic structural view of the pre-tightening spring in the present utility model;

[0030] Figure 9 is a schematic structural view of the short support in the present utility model.

[0031] In the figure, 1. Machine body; 2. Threaded rod; 3. Grinding disc; 4. Bearing; 5. Nut loosening prevention mechanism; 6. Nut; 7. First limiting groove; 8. Second limiting groove; 9. Limiting pin; 10. Limiting ring; 11. Limiting buckle; 12. Pre-tightening spring; 13. Pre-tightening spring accommodation hole; 14. Through hole; 15. Short support; 16. Long support. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The following is a detailed description of the present utility model in conjunction with the drawings and embodiments:

[0033] Figures 1 to 9 As shown, the angle grinder with a loosening prevention structure of the present utility model includes a machine body 1 and a driving motor arranged in the upper part of the inner cavity of the machine body 1. The output shaft of the driving motor is horizontally arranged left and right. The right end of the output shaft of the motor penetrates through the side wall of the machine body 1, and the output shaft of the motor is rotatably connected to the side wall of the machine body 1 through a bearing 4; a threaded rod 2 is coaxially fixed to the right end of the output shaft of the motor. A grinding disc 3 is coaxially sleeved outside the threaded rod 2. The left end face of the grinding disc 3 is closely attached to the inner ring of the bearing 4, and the right end face of the grinding disc 3 abuts against a nut 6 arranged at the right end of the threaded rod 2. The threaded rod 2 and the nut 6 are detachably connected by threads; a nut loosening prevention mechanism 5 is further arranged at the right end of the nut 6. The nut loosening prevention mechanism 5 is used to limit the rotation of the nut 6 along the thread and prevent a gap from being generated between the right end face of the grinding disc 3 and the nut 6.

[0034] During the working process, the output shaft of the driving motor rotates, and the grinding disc 3 connected to the output shaft of the motor is fixed on the threaded rod 2 by the pre-tightening force of the nut 6. The torque of the driving motor is transmitted to the grinding disc 3 through the threaded rod 2, and the grinding disc 3 performs processing operations by rotating.

[0035] In order to prevent the nut 6 arranged on the threaded rod 2 from rotating, causing the nut 6 to move to the right, so that the nut 6 cannot abut against the grinding disc 3 tightly. In the present utility model, the nut loosening prevention mechanism 5 includes a first limiting groove 7 which is axially arranged left and right on the external thread around the threaded rod 2. The cross-section of the first limiting groove 7 is semi-circular. A second limiting groove 8 is correspondingly arranged on the internal thread on the inner wall of the nut 6. The cross-section of the second limiting groove 8 is semi-circular corresponding to the cross-section of the first limiting groove 7; during the working process, the second limiting groove 8 is driven to a set position, and the second limiting groove 8 and the first limiting groove 7 form a pin hole. The nut loosening prevention mechanism 5 further includes a limiting pin 9 inserted in the pin hole. The limiting pin 9 is cylindrical corresponding to the pin hole.

[0036] During the working process, the limiting pin 9 is inserted into the pin hole to prevent the nut 6 from rotating relative to the threaded rod 2, that is, the nut 6 cannot move to the right by rotating, and the nut 6 always abuts tightly against the right end face of the grinding disc 3;

[0037] Since the grinding disc 3 is prone to vibration during the working process, the vibration of the grinding disc 3 is transmitted to the limiting pin 9 inserted in the pin hole through the threaded rod 2, which is likely to cause the limiting pin 9 to move to the right and disengage from the pin hole. To solve this problem; in the present utility model, the nut loosening prevention mechanism 5 further includes a limiting ring 10 arranged at the right end of the limiting pin 9. The limiting ring 10 is coaxially sleeved on the right part of the threaded rod 2. The left end face of the limiting ring 10 is connected to the right end of the limiting pin 9 arranged along the circumferential direction of the threaded rod 2. A limiting buckle 11 is radially penetrated through the right part of the threaded rod 2; the right end face of the limiting ring 10 abuts against the outer side face of the limiting buckle 11; the extrusion force from the limiting buckle 11 makes the limiting ring 10 unable to move to the right, so that the limiting pin 9 connected to the left end face of the limiting ring 10 along the circumferential direction of the threaded rod 2 cannot be disengaged.

[0038] During the working process, due to the different torques applied by the operator to the nut, it may cause partial correspondence between the first limiting groove 7 and the second limiting groove 8, so that the limiting pin 9 cannot be inserted. It is necessary to readjust the torque to the set range, which will increase the assembly difficulty. To overcome this problem; in this embodiment, the left end of the limiting pin 9 is conical, and a pre-tightening spring 12 is arranged axially at the right end of the limiting pin 9. The left end of the pre-tightening spring 12 is connected to the limiting pin 9, and the right end is connected to the limiting ring 10; in order to improve the stability of the pre-tightening spring 12, a pre-tightening spring accommodation hole 13 is opened at the circumferential position of the limiting ring 10 corresponding to the limiting pin 9. The pre-tightening spring 12 is coaxially arranged in the pre-tightening spring accommodation hole 13 and the right end is connected to the bottom surface of the pre-tightening spring accommodation hole 13. During the working process, the pre-tightening spring 12 is always in a compressed state, and the limiting pin 9 is slidably connected to the pre-tightening spring accommodation hole 13 in the left-right direction.

[0039] During the assembly process, when the first limiting groove 7 and the second limiting groove 8 are correspondingly arranged, the left end of the limiting pin 9 is inserted into the pin hole formed by the first limiting groove 7 and the second limiting groove 8, and the pre-tightening spring 12 drives the limiting pin 9 to move leftward until the diameter of the conical surface of the limiting pin 9 exactly matches the inner diameter of the pin hole;

[0040] When the first limiting groove 7 and the second limiting groove 8 are partially correspondingly arranged, the conical surface at the left end of the limiting pin 9 is inserted into the limiting space formed by the first limiting groove 7 and the second limiting groove 8, and the pre-tightening spring 12 drives the limiting pin 9 to move leftward until the diameter of the conical surface at the left end of the limiting pin 9 exactly matches the inner diameter of the limiting space;

[0041] For the convenience of installation, in this embodiment, a through hole 14 is radially opened at the position where the threaded rod 2 correspondingly penetrates the limiting buckle 11. The limiting buckle 11 has a V-shaped structure, and the limiting buckle 11 is made of an elastic material; during the working process, the open end of the V-shaped structure of the limiting buckle 11 is squeezed. After the limiting buckle 11 smoothly passes through the through hole 14, the open end of the V-shaped structure is released to restore its V-shaped structure open state; the tension of the elastic material of the limiting buckle 11 forms a frictional force between the limiting buckle 11 and the inner wall of the pin hole to offset the action of the external force.

[0042] The V-shaped structure of the limiting buckle 11 includes a short support 15 and a long support 16. In order to further ensure that the limiting buckle 11 cannot slide out of the pin hole under the action of an external force, an outward arc-shaped protrusion is provided on the upper part of the long support 16 to further increase the frictional force between the outer wall of the limiting buckle 11 and the inner wall of the pin hole.

[0043] For the convenience of the first limiting groove 7 and the second limiting groove 8 to correspondingly form a pin hole, in this embodiment, multiple groups of second limiting grooves 8 are arranged along the circumferential direction of the internal thread of the nut 6 to meet different torque requirements of the nut 6.

[0044] In this embodiment, a spring washer is coaxially arranged between the nut 6 and the grinding disc 3.

[0045] During the working process, the threaded rod 2 coaxially penetrates through the grinding disc 3. The pre-tightening nut 6 makes the first limiting groove 7 provided at the right end of the threaded rod 2 correspond to the second limiting groove 8 provided on the nut 6 to form a pin hole, or the first limiting groove 7 and the second limiting groove 8 partially correspond to form a limiting space. The limiting pin 9 is inserted into the pin hole or the limiting space from the right side, and at the same time, the limiting ring 10 is driven to the left to make the pre-tightening spring 12 in a compressed state; at this time, the right end face of the limiting ring 10 is on the left side of the through hole 14, and the limiting buckle 11 is inserted into the through hole 14 to complete the installation of the nut anti-loosening mechanism 5 on the angle grinder.

Claims

1. An angle grinder with an anti-loosening structure, characterized in that: The invention comprises a machine body (1) and a driving motor arranged at the upper part of the inner cavity of the machine body (1), wherein the output shaft of the driving motor is arranged horizontally on the left and right sides, the right end of the motor output shaft penetrates the side wall of the machine body (1), and the motor output shaft is rotatably connected to the side wall of the machine body (1) via a bearing (4); a threaded rod (2) is coaxially fixed to the right end of the motor output shaft, a grinding disc (3) is coaxially sleeved outside the threaded rod (2), the left end face of the grinding disc (3) is tightly attached to the inner ring of the bearing (4), the right end face of the grinding disc (3) is tightly abutted against a nut (6) arranged at the right end of the threaded rod (2), and the threaded rod (2) and the nut (6) are detachably connected via a thread; a nut anti-loosening mechanism (5) is also arranged at the right end of the nut (6), and the nut anti-loosening mechanism (5) is used to limit the rotation of the nut (6) along the thread.

2. The angle grinder with an anti-loosening structure according to claim 1, characterized in that: The nut anti-loosening mechanism (5) comprises a first limiting groove (7) arranged on the left and right sides of the circumferential external thread of the threaded rod (2), the cross section of the first limiting groove (7) being semicircular, and a second limiting groove (8) correspondingly provided on the internal thread of the inner wall of the nut (6), the cross section of the second limiting groove (8) being semicircular corresponding to the cross section of the first limiting groove (7); the nut anti-loosening mechanism (5) comprises a limiting pin (9) inserted in the pin hole, the limiting pin (9) being cylindrical corresponding to the pin hole.

3. The angle grinder with an anti-loosening structure according to claim 2, characterized in that: The nut anti-loosening mechanism (5) further comprises a limiting ring (10) arranged at the right end of the limiting pin (9); the limiting ring (10) is coaxially sleeved on the right part of the threaded rod (2); the left end face of the limiting ring (10) is connected to the right end of the limiting pin (9) arranged along the circumference of the threaded rod (2); a limiting buckle (11) is radially penetrated along the right part of the threaded rod (2); and the right end face of the limiting ring (10) is pressed against the outer side face of the limiting buckle (11).

4. The angle grinder with an anti-loosening structure according to claim 3, characterized in that: The left end of the limit pin (9) is conical, and a preload spring (12) is axially arranged at the right end of the limit pin (9). The left end of the preload spring (12) is connected to the limit pin (9), and the right end is connected to the limit ring (10).

5. The angle grinder with an anti-loosening structure according to claim 4, characterized in that: The limiting ring (10) is provided with a preload spring receiving hole (13) at a position corresponding to the limiting pin (9) in the circumferential direction. The preload spring (12) is coaxially arranged in the preload spring receiving hole (13) and the right end is connected to the bottom surface of the preload spring receiving hole (13). The limiting pin (9) is connected to the preload spring receiving hole (13) in a left-right sliding manner.

6. The angle grinder with an anti-loosening structure according to claim 5, characterized in that: The threaded rod (2) is provided with a through hole (14) at a position corresponding to the position where the limiting buckle (11) is passed through.

7. The angle grinder with an anti-loosening structure according to claim 6, characterized in that: The limiting buckle (11) has a V-shaped structure, and the limiting buckle (11) is made of elastic material.

8. The angle grinder with an anti-loosening structure according to claim 7, characterized in that: The V-shaped structure of the position-limiting buckle (11) comprises a short support (15) and a long support (16), and the upper part of the long support (16) is provided with an arc-shaped protrusion facing outwards.

9. The angle grinder with an anti-loosening structure according to claim 2, characterized in that: A plurality of groups of second limiting grooves (8) are arranged along the circumference of the internal thread of the nut (6).

10. The angle grinder with an anti-loosening structure according to claim 9, characterized in that: A spring washer is coaxially arranged between the nut (6) and the grinding plate (3).

Images