Quick change angle grinder

Abstract

This invention discloses a quick-change angle grinder, comprising a main unit, a quick-change front housing, a gearbox cover, an output shaft, a push unit, an input gear, a push rod, a push cylinder, a reset component, a base, a clamping assembly, and a tool unit. The upper end of the push rod engages with the cam portion of the push unit, and the lower end of the push rod extends into the output shaft and engages with the push cylinder. The clamping assembly is connected inside the base and engages with the push cylinder, with its lower part extending out of the base. When the push cylinder moves upward, it drives the clamping assembly to clamp the tool unit onto the lower end face of the base; when the push cylinder moves downward, the clamping assembly releases the tool unit. This invention utilizes the cooperation between the clamping assembly, the push unit, the push rod, the push cylinder, and the reset component, allowing the operation of the push unit to control the clamping assembly to tighten or loosen the tool unit, simplifying operation and facilitating tool unit replacement.

Description

Technical Field

[0001] This invention relates to the field of angle grinders, and more specifically to a quick-change angle grinder. Background Technology

[0002] An angle grinder is a handheld power tool used for cutting and polishing. It utilizes a high-speed rotating thin grinding wheel, such as a rubber wheel or a wire wheel, to grind, cut, remove rust, and polish metal components. After a period of use, the grinding discs need to be replaced. Most angle grinders on the market use nuts to secure the grinding discs, requiring a wrench or other tools for replacement, which is time-consuming and laborious, significantly impacting the normal operation of the work. Summary of the Invention

[0003] The purpose of this invention is to provide a quick-change angle grinder that solves the problems mentioned in the background art.

[0004] The technical solution to achieve the objective of this invention is: a quick-change angle grinder, comprising a main unit, a quick-change front housing, a gearbox cover, an output shaft, a push unit, an input gear, a push rod, a push cylinder, a reset component, a base, a clamping assembly, and a tool unit; the quick-change front housing is fixed to the output end of the main unit, and the output gear of the main unit extends into the quick-change front housing; the gearbox cover is fixed to the bottom of the quick-change front housing; the upper part of the output shaft is rotatably disposed within the quick-change front housing, the middle part of the output shaft is rotatably disposed within the gearbox cover, and the lower part of the output shaft extends out of the gearbox cover; the push unit is rotatably disposed at the top of the quick-change front housing, and the push rod... The tool unit is provided with a cam section; the input gear is sleeved on the output shaft and meshes with the output gear of the main unit; the push cylinder is disposed inside the output shaft; the push rod passes through the top of the quick-change front housing, the upper end of the push rod cooperates with the cam section of the push unit, and the lower end of the push rod extends into the output shaft and cooperates with the push cylinder; the reset component provides an upward reset force for the push cylinder; the base is fixed to the bottom of the output shaft; the clamping assembly is connected inside the base and cooperates with the push cylinder, and the lower part of the clamping assembly extends out of the base; when the push cylinder moves upward, it drives the clamping assembly to clamp the tool unit on the lower end surface of the base, and when the push cylinder moves downward, the clamping assembly releases the tool unit.

[0005] Furthermore, the clamping assembly includes a clamping block seat, a rotating shaft, and two clamping blocks; the bottom of the base is provided with an inwardly extending boss, and the clamping block seat is disposed on the boss; the rotating shaft is fixed on the clamping block seat; both clamping blocks are rotatably connected to the rotating shaft; the bottom of the two clamping blocks extends out of the base and is provided with an outwardly extending clamping protrusion; the clamping protrusions of the two clamping blocks extend in opposite directions.

[0006] Furthermore, the two clamping blocks are provided with an upper pushing protrusion and a lower pushing protrusion spaced apart above the clamping protrusion; a pushing groove is formed between the upper pushing protrusion and the lower pushing protrusion; a pushing shaft is provided on each side of the bottom of the push cylinder, and the two pushing shafts are respectively located in the pushing grooves of the two clamping blocks; when the push cylinder moves upward, the pushing shaft pushes the upper pushing protrusion, so that the clamping protrusion is close to the lower end face of the base, thereby clamping the tool unit; when the push cylinder moves downward, the pushing shaft pushes the lower pushing protrusion, so that the clamping protrusion is away from the lower end face of the base, thereby releasing the tool unit.

[0007] Furthermore, a sealing ring is provided between the clamping block seat of the clamping assembly and the boss of the base.

[0008] Furthermore, the reset element is a compression spring disposed inside the push cylinder and pressing against the clamping block seat.

[0009] Furthermore, the base is threadedly connected to the output shaft.

[0010] Furthermore, both the input gear and the output gear of the host are bevel gears.

[0011] Furthermore, the upper part of the output shaft is connected to the quick-change front housing via an oil-impregnated bearing, and the middle part of the output shaft is connected to the gearbox cover via a deep groove ball bearing.

[0012] Furthermore, the gearbox cover is provided with a quick-release cover on the outside.

[0013] Furthermore, two positioning beads are symmetrically arranged on the outer circumferential surface of the gearbox cover; two slots are symmetrically arranged on the upper part of the quick-release cover, and multiple positioning holes are evenly distributed between the two slots; the two slots and the multiple positioning holes are all suitable for cooperating with the two positioning beads.

[0014] Furthermore, the push unit is also provided with an operating part, which is located on both sides of the rotation axis of the push unit, respectively. By moving the operating part, the rotation of the cam part can be controlled, thereby pushing the push rod to move.

[0015] Furthermore, the upper inner wall surface of the quick-release cover is provided with at least one protrusion; the bottom of the outer peripheral surface of the gearbox cover is provided with a notch that is the same number and position as the protrusion and allows the protrusion to pass through; an annular groove is provided between the positioning bead and the notch.

[0016] By adopting the above technical solution, the present invention has the following beneficial effects:

[0017] (1) The present invention uses the cooperation of clamping component with push unit, push rod, push cylinder and reset component, so that the operation of push unit can control clamping component to clamp or release tool unit, which is simple to operate and convenient to replace tool unit.

[0018] (2) The present invention provides a sealing ring between the clamping component and the base, which can seal the gap between the clamping component and the base, preventing dust from entering the interior of the angle grinder and affecting the performance of the angle grinder.

[0019] (3) The reset component of the present invention is a compression spring. The compression spring is set inside the push cylinder and presses on the clamping block seat. Firstly, the compression spring is common, practical and low in cost. Secondly, the compression spring can provide an upward thrust to the push cylinder, thereby clamping the tool unit with the clamping assembly.

[0020] (4) The input gear and output gear of the present invention are bevel gears, which can change the transmission direction and make the transmission more stable. At the same time, the parts are wear-resistant and have a longer service life.

[0021] (5) The output shaft of the present invention is rotatably connected to the quick-change front housing and gearbox cover through bearings. While fixing the output shaft, it can reduce friction during rotation and reduce power consumption.

[0022] (6) The present invention has a quick-release cover on the outside of the gearbox cover, which can protect the safety of the operator during operation.

[0023] (7) The present invention provides a positioning bead on the gearbox cover and a slot and positioning hole on the quick-release cover to cooperate with the positioning bead. When the user needs to adjust the angle of the quick-release cover, the quick-release cover can be rotated directly, which is simple and convenient. Attached Figure Description

[0024] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein...

[0025] Figure 1 This is a schematic diagram of the structure of the present invention.

[0026] Figure 2 This is an exploded view of the quick-change power assembly of the present invention.

[0027] Figure 3 This is a schematic diagram of the internal structure of the quick-change front housing and gearbox cover of the present invention.

[0028] Figure 4 This is a schematic diagram of the pusher and clamping block of the present invention.

[0029] Figure 5 This is a cross-sectional view of the present invention.

[0030] The labels in the attached diagram are as follows: 1. Main unit; 2. Quick-change front housing; 3. Gearbox cover; 3-1. Positioning bead; 3-2. Notch; 3-3. Annular groove; 4. Output shaft; 5. Push unit; 5-1. Cam part; 5-2. Operating part; 6. Input gear; 7. Push rod; 8. Push cylinder; 8-1. Push shaft; 9. Reset part; 10. Base; 11. Clamping assembly; 11-1. Clamping block seat; 11-2. Rotating shaft; 11-3. Clamping block; 11-3-1. Clamping protrusion; 11-3-2. Upper pushing protrusion; 11-3-3. Lower pushing protrusion; Clamping block; 12. Tool unit; 13. Sealing ring; 14. Quick-release cover; 14-1. Groove; 14-2. Positioning hole; 14-3. Protrusion; Detailed Implementation

[0031] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of the embodiments of the present invention, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0036] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances. The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and should not be used to limit the scope of protection of the present invention.

[0037] Example 1: A quick-change angle grinder of this example includes: a main unit 1, a quick-change front housing 2, a gearbox cover 3, an output shaft 4, a push unit 5, an input gear 6, a push rod 7, a push cylinder 8, a reset component 9, a base 10, a clamping assembly 11, a tool unit 12, a sealing ring 13, and a quick-release cover 14.

[0038] See Figure 1-5 The main unit 1 has an output gear at its output end. A quick-change front housing 2 is fixed to the output end of the main unit 1, and the output gear extends deep into the quick-change front housing 2. An input gear 6 is located inside the quick-change housing 2. The input gear 6 meshes with the output gear of the main unit 1, and the main unit 1 rotates to drive the input gear 6. In this embodiment, the input gear 6 and the output gear are preferably bevel gears, which change the direction of gear transmission, resulting in more stable transmission between the gears. Additionally, the parts are more wear-resistant and have a longer service life.

[0039] See Figure 1-3 The gearbox cover 3 is fixed to the bottom of the quick-change front housing 2. A quick-release cover 14 is provided on the outside of the gearbox cover 3. The quick-release cover 14 is fan-shaped and has a U-shaped groove to accommodate the tool unit 12. The quick-release cover 14 protects the operator's safety. Two positioning beads 3-1 are symmetrically arranged on the outer circumference of the gearbox cover 3. Two slots 14-1 are symmetrically arranged on the upper part of the quick-release cover 14. Multiple positioning holes 14-2 are evenly distributed between the two slots 14-1. The two slots 14-1 and the multiple positioning holes 14-2 are all suitable for cooperating with the two positioning beads 3-1. In this embodiment, the positioning beads 3-1 are preferably elastic bodies. When the user is working, sometimes it is necessary to adjust the angle of the quick-release cover 14 to facilitate cutting and grinding. Now, the quick-release cover 14 can be directly rotated to the appropriate position, which is simple and convenient.

[0040] The upper inner wall surface of the quick-release cover 14 is provided with at least one protrusion 14-3. The bottom of the outer peripheral surface of the gearbox cover 3 is provided with a notch 3-2 that is the same number and position as the protrusion 14-3 and allows the protrusion to pass through. An annular groove 3-3 is provided between the positioning bead 3-1 and the notch 3-2. When installing the quick-release cover 14, align the protrusion 14-3 with the notch 3-2. After the protrusion 14-3 passes through the notch 3-2, rotate the quick-release cover 14 to lock the protrusion 14-3 into the annular groove 3-3, preventing the quick-release cover 14 from falling off.

[0041] The output shaft 4 has a smaller inner diameter at the top and a larger inner diameter at the bottom. The upper part of the output shaft 4 is housed within the quick-change front housing 2 and is rotatably connected to it via an oil-impregnated bearing. The middle part of the output shaft 4 is rotatably housed within the gearbox cover 3 and is rotatably connected to it via a deep groove ball bearing. The lower part of the output shaft 4 extends out of the gearbox cover 3. The input gear 6 is fixedly mounted on the output shaft 4. When the main unit 1 operates, the output shaft 4 rotates via gear transmission. The bearings fix the output shaft 4, minimizing friction during rotation and reducing power consumption.

[0042] The base 10 is fixed to the bottom of the output shaft 4 and threadedly connected to it. The clamping assembly 11 is connected inside the base 10. The clamping assembly 11 includes a clamping block seat 11-1, a rotating shaft 11-2, and two clamping blocks 11-3. The bottom of the base 10 has an inwardly extending boss, and the clamping block seat 11-1 is mounted on the boss. During operation, dust generated by the angle grinder will enter the grinder, affecting its performance. Therefore, a sealing ring 13 is provided between the clamping block seat 11-1 and the boss to seal the gap between the clamping assembly 11 and the base 10. The rotating shaft 11-2 is fixed to the clamping block seat 11-1, and both clamping blocks 11-3 are rotatably connected to the rotating shaft 11-2. The bottoms of the two clamping blocks 11-3 extend outward from the base 10 and have outwardly extending clamping protrusions 11-3-1. The extending directions of the clamping protrusions 11-3-1 on the two clamping blocks 11-3 are opposite. The two clamping blocks 11-3 are provided with an upper pushing protrusion 11-3-2 and a lower pushing protrusion 11-3-3 at a distance above the clamping protrusion 11-3-1. A pushing groove is formed between the upper pushing protrusion 11-3-2 and the lower pushing protrusion 11-3-3.

[0043] See Figure 3-4A push cylinder 8 is installed inside the cavity of the output shaft 4, with its upper end closed. The lower end of the push rod 7 extends into the upper part of the output shaft 4, engaging with the upper end of the push cylinder 8, and its upper end penetrates the top of the quick-change front housing 2, engaging with the push unit 5. The push unit 5 is rotatably mounted on the quick-change front housing 2. The push unit 5 is equipped with an operating part 5-2 and a cam part 5-1, which are respectively located on both sides of the rotation axis of the push unit 5. By operating the operating part 5-2, the cam part 5-1 can be rotated, causing the contact surface between the push rod 7 and the cam part 5-1 to continuously change, and the distance between the contact surface and the rotation axis of the push unit 5 also continuously changes, thereby pushing the push rod 7 to move. When the push unit 5 is fully open, the distance between the contact surface and the rotation axis of the push unit 5 is at its maximum.

[0044] See Figure 4 The push cylinder 8 has a push shaft 8-1 on each side of its bottom, and the two push shafts 8-1 are respectively located in the push grooves of the two clamping blocks 11-3. A spring-loaded reset member 9 is provided inside the push cylinder 8. One side of the reset member 9 abuts against the closed upper end of the push cylinder 8, and the other side abuts against the clamping block seat 11-1. The reset member 9 provides an upward reset force for the push cylinder 8. In this embodiment, the reset member 9 is preferably a compression spring, which is simple, practical, and low in cost.

[0045] See Figure 5 When the pushing unit 5 is in the closed state, the distance from the contact surface between the push rod 7 and the pushing unit 5 to the rotation axis is relatively short. Due to the presence of the reset member 9, the push cylinder 8 moves upward, and the push shaft 8-1 pushes the upper pushing protrusion 11-3-2, causing the clamping protrusion 11-3-1 to approach the lower end face of the base 10. The tool unit 12 is installed between the clamping protrusion 11-3-1 and the lower end face of the base 10, thereby clamping the tool unit 12. When the pushing unit 5 is in the open state, the distance from the contact surface between the push rod 7 and the pushing unit 5 to the rotation axis is at its longest. The push cylinder 8 moves downward, the reset member 9 is compressed, and the push shaft 8-1 pushes the lower pushing protrusion 11-3-3, causing the clamping protrusion 11-3-1 to move away from the lower end face of the base 10, thereby releasing the tool unit 12.

[0046] The working principle of a quick-change angle grinder according to the present invention is as follows: The drive unit 1 rotates, and through gear transmission, drives the output shaft 4 to rotate. The clamping assembly 11 cooperates with the base 10 to clamp the tool unit 12. The rotation of the output shaft 4 can drive the tool unit 12 to rotate and work. When it is necessary to replace the tool unit 12, the drive unit 1 is turned off and the push unit 5 is turned on. At this time, the distance from the contact surface between the push rod 7 and the push unit 5 to the rotation axis is at its maximum. The push rod 7 is pressed down, the push cylinder 8 moves down, the reset member 9 is compressed, and the push shaft 8-1 pushes the lower push protrusion 11-3-3, so that the clamping protrusion 11-3-1 is away from the lower end face of the base 10, thereby releasing the tool unit 12. After the replacement is completed, the push unit 5 is turned off. The reset member 9 pushes the push cylinder 8 upward through the elastic force, and the push shaft 8-1 pushes the upper push protrusion 11-3-2, thereby driving the clamping assembly 11 to clamp the tool unit 12 on the lower end face of the base 10.

[0047] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A quick-change angle grinder, characterized in that: The system includes a main unit (1), a quick-change front housing (2), a gearbox cover (3), an output shaft (4), a push unit (5), an input gear (6), a push rod (7), a push cylinder (8), a reset component (9), a base (10), a clamping assembly (11), and a tool unit (12). The quick-change front housing (2) is fixed to the output end of the main unit (1), and the output gear of the main unit (1) extends into the quick-change front housing (2). The gearbox cover (3) is fixed to the bottom of the quick-change front housing (2). The upper part of the output shaft (4) is rotatably disposed within the quick-change front housing (2), the middle part of the output shaft (4) is rotatably disposed within the gearbox cover (3), and the lower part of the output shaft (4) extends out of the gearbox cover (3). The push rod (7) is a push cylinder (8), a reset component (9), a base (10), a clamping assembly (11), and a tool unit (12). The moving unit (5) is rotatably mounted on the top of the quick-change front housing (2), and the pushing unit (5) is provided with a cam part (5-1); the input gear (6) is sleeved on the output shaft (4) and meshes with the output gear of the main unit (1); the push cylinder (8) is disposed inside the output shaft (4); the push rod (7) passes through the top of the quick-change front housing (2), the upper end of the push rod (7) cooperates with the cam part (5-1) of the pushing unit (5), and the lower end of the push rod (7) extends into the output shaft (4) and cooperates with the push cylinder (8); the reset member (9) provides the push cylinder (8) with an upward reset force; the base (10) is fixed to the bottom of the output shaft (4); the clamping assembly (11) is connected to the base (10). The tool unit (12) is located inside the base (10) and cooperates with the push cylinder (8). The lower part of the clamping assembly (11) extends out of the base (10). When the push cylinder (8) moves upward, it drives the clamping assembly (11) to clamp the tool unit (12) on the lower end face of the base (10). When the push cylinder (8) moves downward, the clamping assembly (11) releases the tool unit (12). The clamping assembly (11) includes a clamping block seat (11-1), a rotating shaft (11-2), and two clamping blocks (11-3). The bottom of the base (10) is provided with an inwardly extending boss, and the clamping block seat (11-1) is set on the boss. The rotating shaft (11-2) is fixed on the clamping block seat (11-1). The two clamping blocks (11-3) are rotatably connected to the rotating shaft (11-2). The bottom of the two clamping blocks (11-3) extends out of the base (10) and is provided with clamping protrusions (11-3-1) extending outward; the clamping protrusions (11-3-1) of the two clamping blocks (11-3) extend in opposite directions; an upper pushing protrusion (11-3-2) and a lower pushing protrusion (11-3-3) are provided on the two clamping blocks (11-3) above the clamping protrusions (11-3-1) at a distance; a pushing groove is formed between the upper pushing protrusion (11-3-2) and the lower pushing protrusion (11-3-3); a pushing shaft (8-1) is provided on each side of the bottom of the push cylinder (8), and the two pushing shafts (8-1) are respectively located in the pushing grooves of the two clamping blocks (11-3);When the push cylinder (8) moves upward, the push shaft (8-1) pushes the upper push protrusion (11-3-2), causing the clamping protrusion (11-3-1) to approach the lower end face of the base (10), thereby clamping the tool unit (12); when the push cylinder (8) moves downward, the push shaft (8-1) pushes the lower push protrusion (11-3-3), causing the clamping protrusion (11-3-1) to move away from the lower end face of the base (10), thereby releasing the tool unit (12).

2. The quick change angle grinder of claim 1, wherein: A sealing ring (13) is provided between the clamping block seat (11-1) of the clamping assembly (11) and the boss of the base (10).

3. The quick change angle grinder of claim 1, wherein: The reset component (9) is a compression spring installed inside the push cylinder (8) and pressed against the clamping block seat (11-1).

4. The quick change angle grinder of claim 1, wherein: The base (10) is threadedly connected to the output shaft (4).

5. A quick-change angle grinder according to claim 1, characterized in that: Both the input gear (6) and the output gear of the host (1) are bevel gears.

6. A quick-change angle grinder according to claim 1, characterized in that: The upper part of the output shaft (4) is connected to the quick-change front housing (2) through an oil-impregnated bearing, and the middle part of the output shaft (4) is connected to the gearbox cover (3) through a deep groove ball bearing.

7. A quick-change angle grinder according to claim 1, characterized in that: The gearbox cover (3) is provided with a quick-release cover (14) on the outside.

8. A quick-change angle grinder according to claim 7, characterized in that: Two positioning beads (3-1) are symmetrically arranged on the outer circumferential surface of the gearbox cover (3); two slots (14-1) are symmetrically arranged on the upper part of the quick-release cover (14), and multiple positioning holes (14-2) are evenly distributed between the two slots (14-1); the two slots (14-1) and the multiple positioning holes (14-2) are all suitable for cooperating with the two positioning beads (3-1).

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