Handheld brushless angle grinder

Abstract

The utility model discloses a handheld brushless angle grinder, which relates to the technical field of angle grinders and comprises a handheld main body, a machine head is arranged at the front end of the handheld main body, a connecting seat is arranged at the lower end of the machine head, a connecting shaft component is arranged below the connecting seat, a connecting shaft is arranged at the center of the lower end of the connecting shaft component, and a motor is arranged on the connecting shaft. A grinding wheel is arranged below the connecting shaft assembly, a through hole is formed in the center of the grinding wheel, a pressing disc is arranged below the grinding wheel, a protective cover is arranged outside one side of the grinding wheel, a dust collecting box and an exhaust fan are arranged above the machine head, and the dust collecting box communicates with the exhaust fan. According to the handheld brushless angle grinder, the smoke suction structure is arranged, smoke and dust generated in the grinding process are sucked and collected through the smoke suction structure, the flying smoke and dust are prevented from being sucked by workers, and the using effect of the handheld brushless angle grinder is improved.

Description

Technical Field

[0001] This utility model relates to the field of angle grinder technology, specifically a handheld brushless angle grinder. Background Technology

[0002] A brushless angle grinder is a high-efficiency and convenient grinding tool. It is a brushless power tool that does not use carbon brushes. Employing brushless motor technology, it features high efficiency, energy saving, low noise, and high precision. It mainly consists of a power switch, motor, housing, heat sink, and grinding wheel. The motor is the core component, responsible for driving the grinding wheel to rotate and perform the grinding operation. The power switch controls the motor's start and stop, while the housing and heat sink provide protection and heat dissipation. The brushless motor uses an electronic commutator to control the direction of the current, thereby achieving motor rotation. Brushless angle grinders offer advantages such as high efficiency, energy saving, long lifespan, low noise, high safety performance, and wide applicability.

[0003] Chinese Patent Publication No. CN221364238U, authorized on July 19, 2024, discloses a handheld lithium-ion brushless angle grinder. The grinder includes a body with a grinding wheel mounted on it, a detachable cover over the grinding wheel, an opening on the cover that can be fitted onto the body, mounting plates extending outwards from both ends of the opening, and a locking structure between the two mounting plates to restrict their separation and ensure relative stillness between the mounting ring and the body. The locking structure includes a limiting plate, a block on the limiting plate that can pass through the two mounting plates sequentially, a telescopic groove recessed on the side wall of the block, a locking block extending and retracting within the telescopic groove that engages with the limiting plate to clamp the two mounting plates when extended or disengages from the mounting plates when retracted, and a control structure between the block and the locking block to control the extension and retraction of the locking block. The mounting plate has a through groove for the block to pass through. This handheld lithium-ion brushless angle grinder requires no additional auxiliary tools and is easy to assemble and disassemble.

[0004] Existing handheld brushless angle grinders lack a smoke extraction function, and the fumes and dust generated during the grinding process cannot be cleaned up in a timely manner. The drifting fumes and dust can easily be inhaled by workers, which can affect their health, reduce the effectiveness of the handheld brushless angle grinder, and fail to meet usage requirements. Utility Model Content

[0005] The purpose of this utility model is to provide a handheld brushless angle grinder to solve the problems mentioned in the background art, namely that existing handheld brushless angle grinders do not have a smoke extraction function, the smoke and dust generated during the grinding process cannot be cleaned up in time, the drifting smoke and dust are easily inhaled by workers, which will affect the health of workers, reduce the performance of handheld brushless angle grinders, and fail to meet the needs of use.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a handheld brushless angle grinder, comprising a handheld body, a head being provided at the front end of the handheld body, and the head being connected to the handheld body by screws; a connecting seat being provided at the lower end of the head, and the connecting seat being integral with the head; a connecting shaft assembly being provided below the connecting seat, and the connecting shaft assembly being rotatably connected to the head and the connecting seat; a connecting shaft being provided at the center of the lower end of the connecting shaft assembly, and one end of the connecting shaft being integral with the connecting shaft assembly; the connecting shaft assembly... A grinding wheel is installed below the machine head, with a through hole at its center, corresponding to the connecting shaft. A pressure plate is installed below the grinding wheel, and the grinding wheel and pressure plate are connected to the connecting shaft. A protective cover is installed on one side of the grinding wheel, and the protective cover is fixedly connected to the connecting seat. A dust collection box and an exhaust fan are installed above the machine head, and the dust collection box and exhaust fan are connected to the machine head by screws. The dust collection box and the exhaust fan are connected in communication. A connecting pipe is installed between the dust collection box and the protective cover, and both ends of the connecting pipe are connected to the protective cover and the dust collection box as a whole.

[0007] Preferably, a brushless motor is provided inside the front end of the handheld body, and the brushless motor is connected to the handheld body by screws. A drive cavity is provided inside the head, and a first bevel gear disk and a second bevel gear disk are provided inside the drive cavity. The first bevel gear disk and the second bevel gear disk are meshed and connected. The first bevel gear disk and the second bevel gear disk are respectively fixedly connected to the output end of the brushless motor and one end of the connecting shaft assembly.

[0008] Preferably, the lower end of the connecting shaft assembly is provided with four protruding posts, and the protruding posts are integrated with the connecting shaft assembly. The four protruding posts are equidistantly arranged on the outside of the connecting shaft.

[0009] Preferably, the bottom of the grinding wheel is provided with positioning holes, and there are four positioning holes, which are equidistant from each other on the bottom of the grinding wheel. The positioning holes are corresponding to the protruding posts, and the protruding posts are inserted into the grinding wheel.

[0010] Preferably, the lower end of the connecting shaft is provided with a telescopic cavity. There are two telescopic cavities, which are located on both sides of the connecting shaft. Each of the two telescopic cavities is provided with a limit block, which is slidably connected to the connecting shaft. The cross-section of the limit block is a right trapezoid. The telescopic cavity is provided with a compression spring, and the two ends of the compression spring are fixedly connected to the connecting shaft and the limit block, respectively.

[0011] Preferably, a power cord is provided at the rear end of the handheld body, and the power cord is integrated with the handheld body. A switch button is provided on one side of the handheld body, and the switch button is connected to the handheld body by screws. A heat dissipation groove is provided at the tail end of the handheld body.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This utility model device, through the setting of a protective cover, a dust collection box, an exhaust fan and a connecting pipe, forms a protective layer on the outside of the grinding wheel to block the grinding dust. The exhaust fan generates a strong suction force, and under the action of suction force, the generated smoke and dust are drawn into the dust collection box through the connecting pipe and collected to prevent the drifting smoke and dust from being inhaled by the workers.

[0014] 2. This utility model device, through the setting of a protruding column, a positioning hole, a compression spring, a telescopic cavity, and a limiting block, inserts the protruding column into the positioning hole to position the installed grinding wheel. When the pressure plate is installed, it contacts the limiting block and applies pressure. Under the action of pressure, the limiting block is pressed into the telescopic cavity. The compression spring is in a compressed state. After the pressure plate is installed in place, it is in close contact with the grinding wheel. At this time, the compression spring applies a pushing force to the limiting block, pushing the limiting block out of the telescopic cavity and contacting the end face of the pressure plate to limit the installed pressure plate. When disassembling, the limiting block is pressed into the telescopic cavity, and the pressure plate is removed from the connecting shaft to complete the disassembly of the grinding wheel. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is the front view of the present invention;

[0017] Figure 3 This is a diagram showing the connection relationship between the grinding wheel and the machine head in this utility model;

[0018] Figure 4 For the present utility model Figure 3 A magnified view of a portion of area A;

[0019] Figure 5 This is a three-dimensional view of the grinding wheel of this utility model.

[0020] In the diagram: 1. Handheld main body; 2. Head; 3. Switch button; 4. Heat dissipation groove; 5. Power cord; 6. Connecting seat; 7. Grinding wheel; 8. Protective cover; 9. Dust collection box; 10. Exhaust fan; 11. Connecting pipe; 12. Connecting shaft assembly; 13. Brushless motor; 14. Drive cavity; 15. First bevel gear disk; 16. Second bevel gear disk; 17. Pressure plate; 18. Connecting shaft; 19. Protruding column; 20. Through hole; 21. Positioning hole; 22. Compression spring; 23. Telescopic cavity; 24. Limiting block. Detailed Implementation

[0021] 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.

[0022] Please see Figures 1-5 This utility model provides an embodiment of a handheld brushless angle grinder, comprising a handheld body 1, a head 2 at the front end of the handheld body 1, and the head 2 being connected to the handheld body 1 by screws. A connecting seat 6 is provided at the lower end of the head 2, and the connecting seat 6 is integrally formed with the head 2. A connecting shaft assembly 12 is provided below the connecting seat 6, and the connecting shaft assembly 12 is rotatably connected to the head 2 and the connecting seat 6. A connecting shaft 18 is provided at the center of the lower end of the connecting shaft assembly 12, and one end of the connecting shaft 18 is integrally formed with the connecting shaft assembly 12. A grinding wheel 7 is provided below the connecting shaft assembly 12, and a through hole 20 is provided at the center of the grinding wheel 7, corresponding to the connecting shaft 18. A pressure plate 17 is provided below the grinding wheel 7, and the grinding wheel 7 and the pressure plate 17 are connected to the connecting shaft 18. A protective cover 8 is provided on one side of the grinding wheel 7, and the protective cover 8 is fixedly connected to the connecting seat 6. A dust collection box 9 and an exhaust fan 10 are provided above the head 2. The dust collection box 9 and the exhaust fan 10 are connected to the head 2 by screws. The dust collection box 9 is connected to the exhaust fan 10. A connecting pipe 11 is provided between the dust collection box 9 and the protective cover 8. The two ends of the connecting pipe 11 are connected to the protective cover 8 and the dust collection box 9 respectively. A brushless motor 13 is provided inside the front end of the handheld body 1. The brushless motor 13 is connected to the handheld body 1 by screws. A drive cavity 14 is provided inside the head 2. A first bevel gear disk 15 and a second bevel gear disk 16 are provided inside the drive cavity 14. The first bevel gear disk 15 and the second bevel gear disk 16 are meshed and connected. The first bevel gear disk 15 and the second bevel gear disk 16 are fixedly connected to the output end of the brushless motor 13 and one end of the connecting shaft assembly 12 respectively. A power cord 5 is provided at the rear end of the handheld body 1. The power cord 5 is connected to the handheld body 1. A switch button 3 is provided on one side of the handheld body 1. The switch button 3 is connected to the handheld body 1 by screws. A heat dissipation groove 4 is provided at the tail end of the handheld body 1.

[0023] In use: The protective cover 8 forms a protective layer on the outside of the grinding wheel 7 to block the grinding dust. The exhaust fan 10 is turned on to generate a strong suction. Under the action of suction, the generated smoke and dust are drawn into the dust collection box 9 through the connecting pipe 11.

[0024] Please see Figure 3 , Figure 4 and Figure 5The lower end of the connecting shaft assembly 12 is provided with four protruding posts 19, which are integrated with the connecting shaft assembly 12. The four protruding posts 19 are equidistantly arranged outside the connecting shaft 18. The bottom of the grinding wheel 7 is provided with four positioning holes 21, which are equidistantly arranged at the bottom of the grinding wheel 7. The positioning holes 21 correspond to the protruding posts 19, and the protruding posts 19 are inserted into the grinding wheel 7. The connecting shaft 18 passes through the through hole 20, and the protruding posts 19 are inserted into the positioning holes 21 to precisely connect the grinding wheel 7 and the connecting shaft assembly 12.

[0025] Please see Figure 3 and Figure 4 The lower end of the connecting shaft 18 has two telescopic cavities 23 located on both sides of the connecting shaft 18. Each telescopic cavity 23 contains a limit block 24, which is slidably connected to the connecting shaft 18. The limit block 24 has a right-angled trapezoidal cross-section. A compression spring 22 is installed inside each telescopic cavity 23, with its two ends fixedly connected to the connecting shaft 18 and the limit block 24, respectively. When the pressure plate 17 is installed, it contacts the limit block 24 and applies pressure, pressing the limit block 24 into the telescopic cavity 23. The compression spring 22 is compressed. After the pressure plate 17 is in place, it is in close contact with the grinding wheel 7. At this time, the pressure plate 17 does not apply pressure to the limit block 24, but the compression spring 22 applies a pushing force to the limit block 24, pushing it out of the telescopic cavity 23 and into contact with the end face of the pressure plate 17, thus limiting the installation of the pressure plate 17 and ensuring the stability of the installed grinding wheel 7.

[0026] Working principle: The connecting shaft 18 passes through the through hole 20, and the protruding post 19 is inserted into the positioning hole 21. The grinding wheel 7 is fitted and connected to the connecting shaft assembly 12. The pressure plate 17 is pressed into the outside of the connecting shaft assembly 12. When the pressure plate 17 is installed, it contacts the limiting block 24 and applies pressure. Under the action of pressure, the limiting block 24 is pressed into the telescopic cavity 23. The compression spring 22 is in a compressed state. After the pressure plate 17 is installed in place, it is in close contact with the grinding wheel 7. At this time, the pressure plate 17 does not apply pressure to the limiting block 24. The compression spring 22 applies a pushing force to the limiting block 24, pushing the limiting block 24 out of the telescopic cavity 23 and contacting the end face of the pressure plate 17, thus limiting the installation of the pressure plate 17. The protective cover 8 forms a protective layer on the outside of the grinding wheel 7 to block the grinding dust. The exhaust fan 10 is turned on to generate a strong suction. Under the action of suction, the generated smoke and dust are drawn into the dust collection box 9 through the connecting pipe 11 for collection.

[0027] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0028] 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. A handheld brushless angle grinder, comprising a handheld body (1), characterized in that, The handheld body (1) has a head (2) at its front end, and the head (2) is connected to the handheld body (1) by screws. A connecting seat (6) is provided at the lower end of the head (2), and the connecting seat (6) is integral with the head (2). A connecting shaft assembly (12) is provided below the connecting seat (6), and the connecting shaft assembly (12) is rotatably connected to the head (2) and the connecting seat (6). A connecting shaft (18) is provided at the center of the lower end of the connecting shaft assembly (12), and one end of the connecting shaft (18) is integral with the connecting shaft assembly (12). A grinding wheel (7) is provided below the connecting shaft assembly (12), and a through hole (20) is provided at the center of the grinding wheel (7). 20) Corresponding to the connecting shaft (18), a pressure plate (17) is provided below the grinding wheel (7), and the grinding wheel (7) and the pressure plate (17) are connected to the connecting shaft (18). A protective cover (8) is provided on the outside of one side of the grinding wheel (7), and the protective cover (8) is fixedly connected to the connecting seat (6). A dust collection box (9) and an exhaust fan (10) are provided above the machine head (2), and the dust collection box (9) and the exhaust fan (10) are connected to the machine head (2) by screws. The dust collection box (9) and the exhaust fan (10) are connected in communication. A connecting pipe (11) is provided between the dust collection box (9) and the protective cover (8), and the two ends of the connecting pipe (11) are connected to the protective cover (8) and the dust collection box (9) as a whole.

2. The handheld brushless angle grinder according to claim 1, characterized in that: A brushless motor (13) is provided inside the front end of the handheld body (1), and the brushless motor (13) is connected to the handheld body (1) by screws. A drive cavity (14) is provided inside the head (2), and a first bevel gear disk (15) and a second bevel gear disk (16) are provided inside the drive cavity (14), and the first bevel gear disk (15) and the second bevel gear disk (16) are meshed and connected. The first bevel gear disk (15) and the second bevel gear disk (16) are respectively fixedly connected to the output end of the brushless motor (13) and one end of the connecting shaft assembly (12).

3. A handheld brushless angle grinder according to claim 2, characterized in that: The lower end of the connecting shaft assembly (12) is provided with a protruding post (19), and there are four protruding posts (19). The protruding posts (19) and the connecting shaft assembly (12) are integrated. The four protruding posts (19) are equidistantly arranged outside the connecting shaft (18).

4. A handheld brushless angle grinder according to claim 3, characterized in that: The bottom of the grinding wheel (7) is provided with positioning holes (21). There are four positioning holes (21), and the four positioning holes (21) are equidistant from each other at the bottom of the grinding wheel (7). The positioning holes (21) are corresponding to the protruding posts (19), and the protruding posts (19) are inserted into the grinding wheel (7).

5. A handheld brushless angle grinder according to claim 2, characterized in that: The lower end of the connecting shaft (18) is provided with a telescopic cavity (23). There are two telescopic cavities (23), and the two telescopic cavities (23) are located on both sides of the connecting shaft (18). Each of the two telescopic cavities (23) is provided with a limit block (24), and the limit block (24) is slidably connected to the connecting shaft (18). The cross section of the limit block (24) is set in a right trapezoid. The telescopic cavity (23) is provided with a compression spring (22), and the two ends of the compression spring (22) are fixedly connected to the connecting shaft (18) and the limit block (24) respectively.

6. A handheld brushless angle grinder according to claim 1, characterized in that: The rear end of the handheld body (1) is provided with a power cord (5), and the power cord (5) is connected to the handheld body (1) as a whole. A switch button (3) is provided on one side of the handheld body (1), and the switch button (3) is connected to the handheld body (1) by screws. A heat dissipation groove (4) is provided at the tail of the handheld body (1).

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