Angle grinder with grinding disc convenient to replace

Abstract

The utility model discloses an angle grinder with a conveniently replaced abrasive disc, and relates to the technical field of angle grinders, the angle grinder comprises an angle grinder main body and the abrasive disc, the front end of the angle grinder main body is provided with a machine head, a rotating shaft is arranged below the machine head, the middle of the abrasive disc is provided with a through hole, one side of the abrasive disc is provided with a compression ring, and the compression ring is provided with a through hole. A second key groove is formed in the outer wall of the rotating shaft, a second protruding strip is arranged on the inner side of the pressing ring, a limiting hole is formed in the inner wall of the pressing ring, a mounting cavity is formed in the front end of the rotating shaft, an ejector rod is arranged in the mounting cavity, and a first compression spring is arranged in the mounting cavity. A through groove is formed in the middle of the ejector rod, a connecting block is arranged in the through groove, the grinding piece of the angle grinder is connected with the rotating shaft through the pressing ring so that the grinding piece can be clamped and fixed, the pressing ring can be rapidly taken down when the grinding piece is replaced, replacement of the grinding piece is facilitated, and the using effect of the angle grinder is improved.

Description

Technical Field

[0001] This utility model relates to the field of angle grinder technology, specifically to an angle grinder that facilitates the replacement of grinding discs. Background Technology

[0002] An angle grinder is a handheld power tool that uses fiberglass for cutting and grinding. It is mainly used for cutting, grinding, and brushing metal and stone. The grinding discs on the angle grinder need to be replaced after prolonged use.

[0003] Chinese Patent Publication No. CN213380850U, authorized on June 8, 2021, discloses an angle grinder with easy-to-replace grinding discs. The grinder includes a housing, grinding discs, and a protective shell. A housing is fixedly connected to the upper surface of the protective shell. A connecting shaft is rotatably connected to each rotating block. A handle is fixedly connected to the outer side of each connecting shaft. A push plate is slidably connected to the outer side of each connecting shaft. A push rod is fixedly connected to the other end of each push plate. A locking plate is fixedly connected to one end of each push rod. Uniformly distributed slots are formed within each rotating block. In this invention, through the arrangement of a pressing plate, a first spring, a sliding rod, and locking blocks, during use, pulling the fixed blocks towards both sides of the fixed shell moves the sliding rod, thereby disengaging the locking blocks from the rotating shaft. Then, pulling the fixed shell downwards disassembles the fixed shell, causing the pressing plate to disassemble as well. The grinding disc can then be directly removed for replacement. This design facilitates the disassembly and replacement of the grinding disc, breaking away from the traditional nut-based fixing and disassembly, and enhancing the innovation of the device.

[0004] The grinding discs of existing angle grinders are fixed with nuts. When replacing the grinding disc, tools such as wrenches are needed to remove the nuts, which increases the difficulty of replacing the grinding disc and has certain limitations in use. This reduces the effectiveness of the angle grinder and fails to meet the needs of users. Utility Model Content

[0005] The purpose of this utility model is to provide an angle grinder with an easy-to-replace grinding disc, in order to solve the problem mentioned in the background art that the grinding discs of existing angle grinders are fixed by nuts. When replacing the grinding disc, it is necessary to use tools such as wrenches to remove the nuts, thereby increasing the difficulty of replacing the grinding disc, which has certain limitations in use, reduces the use effect of the angle grinder, and fails to meet the use requirements.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an angle grinder with easy-to-change grinding discs, comprising an angle grinder body and grinding discs. A head is provided at the front end of the angle grinder body, and the head is connected to the angle grinder body by screws. A rotating shaft is provided below the head, and the rotating shaft is rotatably connected to the head. The rotating shaft has a cross-shaped cross section. A through hole is provided in the middle of the grinding disc, and the rotating shaft is slidably connected to the through hole. A pressure ring is provided on one side of the grinding disc, and the pressure ring is fitted onto the outside of the rotating shaft. Four second keyways are provided on the outer wall of the rotating shaft, and the four second keyways are equidistantly arranged on the outer wall of the rotating shaft. A second protruding strip is provided on the inner side of the pressure ring. Four second protrusions are provided, and the second protrusions are integrated with the pressure ring. The second protrusions are corresponding to the second keyway and are slidably connected to the rotating shaft. The inner wall of the pressure ring is provided with a limit hole. The front end of the rotating shaft is provided with an installation cavity. The installation cavity is provided with a push rod, which is slidably connected to the rotating shaft. The push rod is corresponding to the limit hole. The installation cavity is provided with a first compression spring, which is located on one side of the push rod. The two ends of the first compression spring are fixedly connected to the pressure ring and the push rod, respectively. The middle of the push rod is provided with a through groove. The through groove is provided with a connecting block, which is slidably connected to the rotating shaft and the push rod.

[0007] Preferably, a power cord is provided on the back of the angle grinder body, a switch button is provided on the upper end of the angle grinder body, and the switch button is integrated with the angle grinder body. A servo motor is provided inside the angle grinder body, and the servo motor is connected to the angle grinder body by screws. A drive cavity is provided inside the head, and a first bevel gear and a second bevel gear are provided inside the drive cavity. The first bevel gear and the second bevel gear are respectively connected to the output end of the servo motor and one end of the rotating shaft, and the first bevel gear and the second bevel gear are meshed together.

[0008] Preferably, the cross-sections of the connecting block and the through groove are both arranged in a right-angled trapezoidal shape.

[0009] Preferably, a second compression spring is provided inside the mounting cavity, and the second compression spring is located below the connecting block. The two ends of the second compression spring are fixedly connected to the rotating shaft and the connecting block, respectively.

[0010] Preferably, a first keyway is provided on the inner wall of the through hole, a first protrusion is provided on the outside of the rotating shaft, and the first protrusion is integral with the rotating shaft. The first protrusion is correspondingly provided with the first keyway, and the first protrusion is slidably connected with the grinding disc.

[0011] Preferably, a protective cover is provided on one side below the machine head, and the protective cover is fixedly connected to the machine head. The protective cover is located outside the grinding disc.

[0012] Preferably, the side wall of the machine head is provided with a threaded hole, a handle is provided on one side of the machine head, a connector is provided at one end of the handle, and the connector is integrated with the handle. The connector is provided in correspondence with the threaded hole and is threadedly connected to the machine head.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model device, through the arrangement of a rotating shaft, a pressure ring, a first keyway, a first protruding strip, a push rod, a connecting block, a mounting cavity, a limiting hole, a first compression spring, a second compression spring, a through groove, a second keyway, and a second protruding strip, allows the grinding disc to be fitted onto the rotating shaft. The pressure ring is fitted onto the rotating shaft from one side of the grinding disc, thus achieving grinding disc installation. The first compression spring applies a pushing force to the push rod, which pushes the push rod into the limiting hole under the action of the pushing force, limiting the pressure ring and ensuring the firmness of the installed grinding disc. The first protruding strip is inserted into the first keyway, and the second protruding strip is inserted into the second keyway, limiting the installation of the grinding disc and the pressure ring, thus quickly installing the grinding disc.

[0015] 2. The utility model device, through the setting of a connecting block, a second compression spring and a through groove, has the connecting block movably connected to the push rod in the through groove. When pressure is applied to the connecting block, it descends. When the connecting block descends, it applies pressure to the push rod. Under the action of pressure, the push rod is taken out from the limiting hole, which makes it convenient to remove the pressure ring and replace the grinding disc. After the pressure applied to the connecting block is removed, the second compression spring applies an upward thrust to the connecting block. Under the action of the thrust, it ensures that the connecting block is in the lifted state and does not affect the extension and retraction of the push rod.

[0016] 3. This utility model device, through the setting of a handle, a threaded hole and a connector, connects the connector to the machine head by screwing it into the threaded hole, and installs the handle. By using the handle to apply force on one side of the angle grinder, the stability of the angle grinder during use is improved. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of the present invention;

[0019] Figure 3 This is a diagram showing the connection relationship between the grip and the head of the machine according to this utility model;

[0020] Figure 4 This is a perspective view of the grinding disc of this utility model;

[0021] Figure 5 This is a structural diagram of the connection between the pressure ring and the rotating shaft of this utility model;

[0022] Figure 6This is a diagram showing the connection relationship between the pressure ring and the rotating shaft of this utility model;

[0023] Figure 7 This is a structural diagram of the connection between the connecting block and the top rod of this utility model.

[0024] In the diagram: 1. Angle grinder body; 2. Power cord; 3. Switch button; 4. Handle; 5. Head; 6. Shaft; 7. Grinding disc; 8. Protective cover; 9. Servo motor; 10. Drive cavity; 11. First bevel gear; 12. Second bevel gear; 13. Pressure ring; 14. Threaded hole; 15. Connector; 16. Through hole; 17. First keyway; 18. First raised strip; 19. Push rod; 20. Connecting block; 21. Mounting cavity; 22. Limiting hole; 23. First compression spring; 24. Second compression spring; 25. Through groove; 26. Second keyway; 27. Second raised strip. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] Please see Figure 1-7This utility model provides an embodiment of an angle grinder with easy-to-change grinding discs, comprising an angle grinder body 1 and grinding discs 7. A head 5 is provided at the front end of the angle grinder body 1, and the head 5 is connected to the angle grinder body 1 by screws. A rotating shaft 6 is provided below the head 5, and the rotating shaft 6 is rotatably connected to the head 5. The cross-section of the rotating shaft 6 is cross-shaped. A through hole 16 is provided in the middle of the grinding disc 7, and the rotating shaft 6 is slidably connected to the through hole 16. A pressure ring 13 is provided on one side of the grinding disc 7, and the pressure ring 13 is fitted onto the outside of the rotating shaft 6. The outer wall of the shaft 6 is provided with four second keyways 26, which are equidistant from each other on the outer wall of the shaft 6. The inner side of the pressure ring 13 is provided with four second protrusions 27, which are integral with the pressure ring 13. The second protrusions 27 correspond to the second keyways 26 and are slidably connected to the shaft 6. The inner wall of the pressure ring 13 is provided with limit holes 22. The front end of the shaft 6 is provided with a mounting cavity 21. The angle grinder body 1 is equipped with a push rod 19, which is slidably connected to the rotating shaft 6. The push rod 19 is correspondingly set with the limiting hole 22. The mounting cavity 21 is equipped with a first compression spring 23, which is located on one side of the push rod 19. The two ends of the first compression spring 23 are fixedly connected to the pressure ring 13 and the push rod 19, respectively. A through groove 25 is provided in the middle of the push rod 19. A connecting block 20 is provided inside the through groove 25, and the connecting block 20 is slidably connected to the rotating shaft 6 and the push rod 19. A power cord 2 is provided on the back of the angle grinder body 1. The upper end of the angle grinder body 1 is provided with a switch button 3, and the switch button 3 is integrated with the angle grinder body 1. The angle grinder body 1 is provided with a servo motor 9, and the servo motor 9 is connected to the angle grinder body 1 by screws. The head 5 is provided with a drive cavity 10, and the drive cavity 10 is provided with a first bevel gear 11 and a second bevel gear 12. The first bevel gear 11 and the second bevel gear 12 are respectively connected to the output end of the servo motor 9 and one end of the rotating shaft 6. The first bevel gear 11 and the second bevel gear 12 are meshed.

[0027] In use: First, place the grinding disc 7 onto the rotating shaft 6, align the second protrusion 27 with the second keyway 26 and insert it. Then, place the pressure ring 13 onto the rotating shaft 6. Press down the pressure ring 13 to contact the push rod 19 and apply pressure. First, press the push rod 19 into the mounting cavity 21. After the pressure ring 13 is fully pressed in, the first compression spring 23 applies a pushing force to the push rod 19. Under the action of the pushing force, the push rod 19 is pushed into the limiting hole 22, limiting the pressure ring 13 and ensuring the installation of the grinding disc. 7. For the stability of the grinding disc 7, press the connecting block 20 into the mounting cavity 21, apply pressure to the push rod 19 as the connecting block 20 is pressed in, and remove the push rod 19 from the limiting hole 22 under the pressure. Then remove the pressure ring 13. The servo motor 9 drives the first bevel gear 11 to rotate. The first bevel gear 11 meshes with the second bevel gear 12. As the first bevel gear 11 rotates, it drives the rotating shaft 6 to rotate, which in turn drives the grinding disc 7 to rotate for angle grinding.

[0028] Please see Figure 5 , Figure 6 and Figure 7 Both the connecting block 20 and the through groove 25 have right-angled trapezoidal cross sections. The mounting cavity 21 is equipped with a second compression spring 24, which is located below the connecting block 20. The two ends of the second compression spring 24 are fixedly connected to the rotating shaft 6 and the connecting block 20, respectively. The second compression spring 24 applies an upward thrust to the connecting block 20, ensuring that the connecting block 20 is in a lifted state under the action of the thrust, and does not affect the extension and retraction of the push rod 19.

[0029] Please see Figure 4 and Figure 5 A first keyway 17 is provided on the inner wall of the through hole 16, and a first protrusion 18 is provided on the outside of the rotating shaft 6. The first protrusion 18 is integrated with the rotating shaft 6. The first protrusion 18 is correspondingly provided with the first keyway 17, and the first protrusion 18 is slidably connected with the grinding disc 7. The first protrusion 18 is inserted into the first keyway 17 to position the installed grinding disc 7 and improve the accuracy and stability of the installed grinding disc 7.

[0030] Please see Figure 1 and Figure 3 A protective cover 8 is provided on one side below the head 5, and the protective cover 8 is fixedly connected to the head 5. The protective cover 8 is located outside the grinding disc 7. A threaded hole 14 is provided on the side wall of the head 5. A handle 4 is provided on one side of the head 5. A connector 15 is provided at one end of the handle 4, and the connector 15 is integrated with the handle 4. The connector 15 is correspondingly provided with the threaded hole 14, and the connector 15 is threadedly connected to the head 5. The protective cover 8 forms a protective layer on the outside of the grinding disc 7 to prevent sparks from flying everywhere. The connector 15 is screwed into the threaded hole 14 and connected to the head 5. The handle 4 is installed, and the handle 4 is used to apply force on one side of the angle grinder, which improves the stability of the angle grinder.

[0031] Working principle: The first protruding strip 18 is inserted into the first keyway 17. The grinding disc 7 is first placed on the rotating shaft 6. The second protruding strip 27 is inserted into the second keyway 26. Then, the pressure ring 13 is placed on the rotating shaft 6. The pressure ring 13 is pressed down and contacts the push rod 19 to apply pressure. The push rod 19 is first pressed into the mounting cavity 21. After the pressure ring 13 is fully pressed in, the first compression spring 23 applies a pushing force to the push rod 19. Under the action of the pushing force, the push rod 19 is pushed into the limiting hole 22 to limit the press-fitted pressure ring 13. The servo motor 9 is turned on to drive the first bevel gear 11 to rotate. The first bevel gear 11 meshes with the second bevel gear 12. As the first bevel gear 11 rotates... The rotation of the shaft 6 drives the grinding disc 7 to rotate, which in turn drives the grinding disc 7 to rotate for angle grinding. The protective cover 8 forms a protective layer on the outside of the grinding disc 7 to prevent sparks from flying everywhere. When changing the grinding disc 7, pressure is applied to the connecting block 20 to press the connecting block 20 into the mounting cavity 21. The pressing of the connecting block 20 applies pressure to the push rod 19. Under the action of pressure, the push rod 19 is removed from the limiting hole 22. The pressure ring 13 can then be removed. After the pressure on the connecting block 20 is released, the second compression spring 24 applies an upward thrust to the connecting block 20. Under the action of the thrust, the connecting block 20 is kept in the lifted state and will not affect the extension and retraction of the push rod 19.

[0032] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An angle grinder with a disc that is easy to replace, comprising an angle grinder body (1) and a disc (7), characterized in that: The front end of the angle grinder body (1) is provided with a head (5), and the head (5) is connected with the angle grinder body (1) through screws, the lower portion of the head (5) is provided with a rotating shaft (6), and the rotating shaft (6) is rotatably connected with the head (5), the cross section of the rotating shaft (6) is in a cross shape, the middle portion of the grinding disc (7) is provided with a through hole (16), and the rotating shaft (6) is slidably connected with the through hole (16), one side of the grinding disc (7) is provided with a pressure ring (13), and the pressure ring (13) is sleeved on the outer portion of the rotating shaft (6), the outer wall of the rotating shaft (6) is provided with second key grooves (26), the second key grooves (26) are provided with four, and the four second key grooves (26) are equidistantly arranged on the outer wall of the rotating shaft (6), the inner side of the pressure ring (13) is provided with second protruding strips (27), the second protruding strips (27) are provided with four, and the second protruding strips (27) are integrally arranged with the pressure ring (13), the second protruding strips (27) are correspondingly arranged with the second key grooves (26), and the second protruding strips (27) are slidably connected with the rotating shaft (6), the inner wall of the pressure ring (13) is provided with a limiting hole (22), the inner portion of the front end of the rotating shaft (6) is provided with a mounting cavity (21), the inner portion of the mounting cavity (21) is provided with a jacking rod (19), and the jacking rod (19) is slidably connected with the rotating shaft (6), the jacking rod (19) is correspondingly arranged with the limiting hole (22), the inner portion of the mounting cavity (21) is provided with a first compression spring (23), and the first compression spring (23) is arranged on one side of the jacking rod (19), the two ends of the first compression spring (23) are fixedly connected with the pressure ring (13) and the jacking rod (19) respectively, the middle portion of the jacking rod (19) is provided with a through groove (25), the inner portion of the through groove (25) is provided with a connecting block (20), and the connecting block (20) is slidably connected with the rotating shaft (6) and the jacking rod (19).

2. An angle grinder with easy-to-change abrasive discs according to claim 1, characterized in that: The back portion of the angle grinder body (1) is provided with a power cord (2), the upper end of the angle grinder body (1) is provided with a switch button (3), and the switch button (3) is integrally connected with the angle grinder body (1), the inner portion of the angle grinder body (1) is provided with a servo motor (9), and the servo motor (9) is connected with the angle grinder body (1) through screws, the inner portion of the head (5) is provided with a driving cavity (10), the inner portion of the driving cavity (10) is provided with a first bevel gear (11) and a second bevel gear (12), and the first bevel gear (11) and the second bevel gear (12) are respectively connected with the output end of the servo motor (9) and one end of the rotating shaft (6), and the first bevel gear (11) is meshingly connected with the second bevel gear (12).

3. The angle grinder with easy-to-replace abrasive discs according to claim 1, characterized in that: The cross sections of the connecting block (20) and the through groove (25) are all in right trapezoidal shapes.

4. The angle grinder with easy-to-replace abrasive discs according to claim 1, characterized in that: The inner portion of the mounting cavity (21) is provided with a second compression spring (24), and the second compression spring (24) is arranged below the connecting block (20), and the two ends of the second compression spring (24) are fixedly connected with the rotating shaft (6) and the connecting block (20) respectively.

5. The angle grinder with easy-to-replace abrasive discs according to claim 1, characterized in that: The inner wall of the through hole (16) is provided with a first key groove (17), the outer part of the rotating shaft (6) is provided with a first protruding strip (18) which is integrated with the rotating shaft (6), the first protruding strip (18) is correspondingly arranged with the first key groove (17), and the first protruding strip (18) is in sliding connection with the grinding piece (7).

6. An angle grinder with easy-to-change abrasive discs according to claim 1, characterized in that: One side below the machine head (5) is provided with a protective cover (8) which is fixedly connected with the machine head (5), and the protective cover (8) is arranged outside the grinding piece (7).

7. The angle grinder with easy-to-replace abrasive discs according to claim 1, characterized in that: The sidewall of the machine head (5) is provided with a threaded hole (14), one side of the machine head (5) is provided with a handle (4), one end of the handle (4) is provided with a connecting head (15) which is integrated with the handle (4), the connecting head (15) is correspondingly arranged with the threaded hole (14), and the connecting head (15) is in threaded connection with the machine head (5).

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