CN115805497A

CN115805497A - Quick-change angle grinder

Info

Publication number: CN115805497A
Application number: CN202211626752.XA
Authority: CN
Inventors: 陈松年; 杨旸
Original assignee: Changzhou Toolon Electric Works Co ltd
Current assignee: Changzhou Toolon Electric Works Co ltd
Priority date: 2022-12-16
Filing date: 2022-12-16
Publication date: 2023-03-17

Abstract

The invention discloses a quick-change angle grinder which comprises a main machine, a quick-change front casing, a gear box cover, an output shaft, a pushing unit, an input gear, a push rod, a push cylinder, a resetting piece, a base, a clamping assembly and a tool unit, wherein the main machine is connected with the quick-change front casing through the gear box cover; the upper end of the push rod is matched with the cam part of the pushing unit, and the lower end of the push rod extends into the output shaft to be matched with the push cylinder; the clamping component is connected inside the base and matched with the push cylinder, and the lower part of the clamping component extends out of the base; when the push cylinder moves upwards, the clamping assembly is driven to clamp the tool unit on the lower end face of the base, and when the push cylinder moves downwards, the clamping assembly loosens the tool unit; the clamping assembly is matched with the pushing unit, the push rod, the push cylinder and the reset piece, so that the clamping assembly can be controlled to tighten or loosen the tool unit by operating the pushing unit, the operation is simple, and the tool unit is convenient to replace.

Description

Quick-change angle grinder

Technical Field

The invention relates to the field of angle grinders, in particular to a quick-change angle grinder.

Background

An angle grinder is a portable electric tool for cutting and grinding, and grinds, cuts, removes rust, and polishes metal members using a grindstone, a rubber wheel, a wire wheel, and the like, which rotate at high speed. After a period of use, the sanding sheet needs to be replaced. Most angle mills on the market polish the piece all through the nut fixed, need waste time and energy with the help of other instruments such as spanner during the change, greatly influenced the normal clear of work.

Disclosure of Invention

The invention aims to provide a quick-change angle grinder, which solves the problems in the prior art.

The technical scheme for realizing the purpose of the invention is as follows: a quick-change angle grinder comprises a main machine, a quick-change front machine shell, a gear box cover, an output shaft, a pushing unit, an input gear, a push rod, a push cylinder, a reset piece, a base, a clamping assembly and a tool unit, wherein the main machine is connected with the quick-change front machine shell through a connecting rod; the quick-change front case is fixed at the output end of the host, and an output gear of the host extends into the quick-change front case; the gearbox cover is fixed at the bottom of the quick-change front casing; the upper part of the output shaft is rotatably arranged in the quick-change front shell, the middle part of the output shaft is rotatably arranged in the gearbox cover, and the lower part of the output shaft extends out of the gearbox cover; the pushing unit is rotatably arranged at the top of the quick-change front machine shell and is provided with a cam part; the input gear is fixedly sleeved on the output shaft and is meshed with the output gear of the host; the push cylinder is arranged inside the output shaft; the push rod penetrates through the top of the quick-change front machine shell, the upper end of the push rod is matched with the cam part of the pushing unit, and the lower end of the push rod extends into the output shaft to be matched with the push cylinder; the reset piece provides an upward reset force for the push cylinder; the base is fixed at the bottom of the output shaft; the clamping assembly is connected inside the base and matched with the push cylinder, and the lower part of the clamping assembly extends out of the base; when the push cylinder moves upwards, the clamping assembly is driven to clamp the tool unit on the lower end face of the base, and when the push cylinder moves downwards, the clamping assembly releases the tool unit.

Furthermore, the clamping assembly comprises a clamping block seat, a rotating shaft and two clamping blocks; the bottom of the base is provided with a boss extending inwards, and the clamping block seat is arranged on the boss; the rotating shaft is fixed on the clamping block seat; the two clamping blocks are rotatably connected to the rotating shaft; the bottoms of the two clamping blocks extend out of the base and are provided with clamping bulges extending outwards; the extension directions of the clamping protrusions of the two clamping blocks are opposite.

Furthermore, an upper pushing bulge and a lower pushing bulge are arranged on the two clamping blocks at a distance above the clamping bulge; a pushing groove is formed between the upper pushing bulge and the lower pushing bulge; two sides of the bottom of the push cylinder are respectively provided with a push shaft, and the two push shafts are respectively positioned in the push grooves of the two clamping blocks; when the push cylinder moves upwards, the push shaft pushes the upper push bulge to enable the clamping bulge to be close to the lower end face of the base, so that the tool unit is clamped; when the push cylinder moves downwards, the push shaft pushes the lower push protrusion to enable the clamping protrusion to be far away from the lower end face of the base, and therefore the tool unit is loosened.

Furthermore, a sealing ring is arranged between the clamping block seat of the clamping assembly and the boss of the base.

Furthermore, the reset piece is a pressure spring which is arranged in the push cylinder and pressed on the clamping block seat.

Further, the base is in threaded connection with the output shaft.

Further, the input gear and the output gear of the main machine are both bevel gears.

Furthermore, the upper part of the output shaft is connected with the quick-change front casing through an oil-retaining bearing, and the middle part of the output shaft is connected with the gearbox cover through a deep groove ball bearing.

Furthermore, a quick-release protective cover is arranged outside the gearbox cover.

Furthermore, two positioning beads are symmetrically arranged on the peripheral surface of the gearbox cover; two notches are symmetrically arranged at the upper part of the quick-release protective cover, and a plurality of positioning holes are uniformly distributed between the two notches; the two notches and the plurality of positioning holes are suitable for being matched with the two positioning beads.

Furthermore, the pushing unit is also provided with an operating part, the operating part and the cam part are respectively arranged at two sides of the rotating axis of the pushing unit, and the cam part can be controlled to rotate by pulling the operating part, so that the push rod is pushed to move.

Further, the surface of the inner wall of the upper part of the quick-release protective cover is provided with at least one protruding part; notches which are consistent with the protruding parts in number, correspond to the protruding parts in position and can be penetrated by the protruding parts are arranged at the bottom of the outer peripheral surface of the gear box cover; an annular groove is arranged between the positioning bead and the notch.

By adopting the technical scheme, the invention has the following beneficial effects:

(1) The clamping assembly is matched with the pushing unit, the push rod, the push cylinder and the reset piece, so that the clamping assembly can be controlled to clamp or loosen the tool unit by operating the pushing unit, the operation is simple, and the tool unit is convenient to replace.

(2) According to the invention, the sealing ring is arranged between the clamping component and the base, so that a gap between the clamping component and the base can be sealed, and dust is prevented from entering the angle grinder to influence the performance of the angle grinder.

(3) The reset piece is a pressure spring which is arranged in the push cylinder and pressed on the clamping block seat, firstly, the pressure spring is common and practical, the cost is low, and secondly, the pressure spring can provide upward thrust for the push cylinder, so that the clamping assembly clamps the tool unit.

(4) The input gear and the output gear of the invention adopt the bevel gears, the transmission direction can be changed, the transmission is more stable, meanwhile, the parts are wear-resistant, and the service life is longer.

(5) The output shaft of the invention is rotationally connected with the quick-change front shell and the gearbox cover through the bearing, so that the friction in rotation can be reduced while the output shaft is fixed, and the power consumption is reduced.

(6) According to the invention, the quick-release protective cover is arranged outside the gearbox cover, so that the safety of operators can be protected during working.

(7) According to the invention, the gear box cover is provided with the positioning ball, and the quick-release shield is provided with the notch and the positioning hole which are matched with the positioning ball, so that when a user needs to adjust the angle of the quick-release shield in operation, the quick-release shield can be directly rotated, and the operation is simple and convenient.

Drawings

In order that the manner in which the above recited features of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is an exploded view of the quick-change power assembly of the present invention.

Fig. 3 is a schematic view of the internal structure of the quick-change front housing and the gear box cover of the present invention.

Fig. 4 is a schematic structural view of the pusher and the clamping block of the present invention.

Fig. 5 is a cross-sectional view of the present invention.

The reference numbers in the figures are: 1. a host; 2. quickly replacing the front shell; 3. a gearbox cover; 3-1, positioning beads; 3-2, gap; 3-3, an annular groove; 4. an output shaft; 5. a pushing unit; 5-1, a cam part; 5-2, an operation part; 6. an input gear; 7. a push rod; 8. a push cylinder; 8-1, pushing a shaft; 9. a reset member; 10. a base; 10-1, a boss; 11. a clamping assembly; 11-1, a clamping block seat; 11-2, a rotating shaft; 11-3, clamping blocks; 11-3-1, clamping protrusions; 11-3-2, an upper pushing bulge; 11-3-3, pushing the protrusion downwards; a clamping block; 12. a tool unit; 13. a seal ring; 14. a quick release shield; 14-1, a notch; 14-2, positioning holes; 14-3, a projection;

Detailed Description

In order to better understand the technical scheme, the technical scheme is described in detail in the following with reference to the attached drawings of the specification and specific embodiments.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

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 orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally placed when the product of the present invention is used, or orientations or positional relationships that are conventionally understood by those skilled in the art, which are merely for convenience of description and simplification of the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention.

In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

(example 1)

The quick-change angle grinder of the embodiment comprises: the quick-release mechanism comprises a main machine 1, a quick-release front machine shell 2, a gear box cover 3, an output shaft 4, a pushing unit 5, an input gear 6, a push rod 7, a push cylinder 8, a resetting piece 9, a base 10, a clamping assembly 11, a tool unit 12, a sealing ring 13 and a quick-release shield 14.

Referring to fig. 1-5, an output gear is arranged at the output end of the main machine 1, the quick-change front housing 2 is fixed at the output end of the main machine 1, and the output gear extends into the quick-change front housing 2. An input gear 6 is arranged in the quick-change machine shell 2, the input gear 6 is meshed with an output gear of the main machine 1, and the main machine 1 can drive the input gear 6 to rotate when running. The input gear 6 and the output gear of the embodiment are preferably bevel gears, the direction of gear transmission is changed, the transmission between the gears is stable, parts are wear-resistant, and the service life is longer.

Referring to fig. 1-3, the gearbox cover 3 is fixed to the bottom of the quick-change front housing 2. The gear box cover 3 is provided with a quick-release shield 14 on the outside, and the quick-release shield 14 is fan-shaped and provided with a U-shaped groove for accommodating the tool unit 12. The quick release shield 14 protects the safety of the operator. Two positioning beads 3-1 are symmetrically arranged on the peripheral surface of the gearbox cover 3, two notches 14-1 are symmetrically arranged on the upper portion of the quick-release shield 14, a plurality of positioning holes 14-2 are evenly distributed between the two notches 14-1, and the two notches 14-1 and the plurality of positioning holes 14-2 are suitable for being matched with the two positioning beads 3-1. The positioning ball 3-1 of the present embodiment is preferably an elastic body, when a user works, the user sometimes needs to adjust the angle of the quick release shield 14 to facilitate cutting and polishing, and now the user can directly rotate the quick release shield 14 to a proper position, which is simple and convenient.

The surface of the inner wall of the upper part of the quick-release protective cover 14 is provided with at least one convex part 14-3, the bottom of the outer circumferential surface of the gear box cover 3 is provided with notches 3-2 which are consistent with the convex parts 14-3 in quantity and correspond to the convex parts in position and can be penetrated by the convex parts, and an annular groove 3-3 is arranged between the positioning bead 3-1 and the notch 3-2. When the quick-release shield 14 is installed, the bulge 14-3 is aligned to the notch 3-2, and the bulge 14-3 can be clamped in the annular groove 3-3 by rotating the quick-release shield 14 after passing through the notch 3-2, so that the quick-release shield 14 is prevented from falling off.

The end of the output shaft 4 with a smaller inner diameter is the upper part, and the end with a larger inner diameter is the lower part. The upper part of the output shaft 4 is arranged in the quick-change front shell 2 and is rotationally connected with the quick-change front shell 2 through an oil-containing bearing. The middle part of the output shaft 4 is rotatably arranged in the gear box cover 3 and is rotatably connected with the gear box cover 3 through 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 sleeved on the output shaft 4, the main machine 1 runs and drives the output shaft 4 to rotate through gear transmission, and friction in rotation is small while the output shaft 4 is fixed through a bearing, so that power consumption is reduced. .

The base 10 is fixed to the bottom of the output shaft 4 and is screwed to the output shaft 4. A clamping assembly 11 is attached inside the base 10. The clamping assembly 11 comprises 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 a boss 10-1 extending inwards, and the clamp block seat 11-1 is arranged on the boss 10-1. When the angle grinder works, dust generated in operation can enter the angle grinder, so that the performance of the angle grinder is affected, and therefore a sealing ring 13 is arranged between the clamping block seat 11-1 and the boss 10-1 to seal a gap between the clamping assembly 11 and the base 10. The rotating shaft 11-2 is fixed on the clamping block seat 11-1, and the two clamping blocks 11-3 are rotatably connected to the rotating shaft 11-2. The bottoms of the two clamping blocks 11-3 extend out of the base 10 and are provided with clamping bulges 11-3-1 extending outwards, and the extending directions of the clamping bulges 11-3-1 of the two clamping blocks 11-3 are opposite. An upper pushing bulge 11-3-2 and a lower pushing bulge 11-3-3 are arranged on the two clamping blocks 11-3 and are arranged above the clamping bulge 11-3-1 at intervals. A push groove is formed between the upper push protrusion 11-3-2 and the lower push protrusion 11-3-3.

Referring to fig. 3-4, a push cylinder 8 is arranged in the inner cavity of the output shaft 4, and the upper end of the push cylinder 8 is closed. The lower end of the push rod 7 extends into the upper part of the output shaft 4 and is matched with the upper end of the push cylinder 8, and the upper end of the push rod penetrates through the top of the quick-change front machine shell 2 and is matched with the push unit 5. The pushing unit 5 is rotatably arranged on the quick-change front shell 2. The pushing unit 5 is provided with an operating part 5-2 and a cam part 5-1, and the operating part 5-2 and the cam part 5-1 are respectively arranged at two sides of the rotating axis of the pushing unit 5. The operation part 5-2 is pulled to control the cam part 5-1 to rotate, the contact surface of the push rod 7 and the cam part 5-1 is changed continuously, and the distance between the contact surface and the rotating axis of the pushing unit 5 is also changed continuously, so that the push rod 7 is pushed to move. When the pushing unit 5 is fully opened, the contact surface is at the farthest distance from the rotational axis of the pushing unit 5.

Referring to fig. 4, two sides of the bottom of the push cylinder 8 are respectively provided with a push shaft 8-1, and the two push shafts 8-1 are respectively positioned in the push grooves of the two clamping blocks 11-3. The push cylinder 8 is internally provided with a resetting piece 9 with elasticity, one side of the resetting piece 9 props against the closed upper end of the push cylinder 8, the other side of the resetting piece 9 props against the clamping block seat 11-1, and the resetting piece 9 provides upward resetting force for the push cylinder 8. The resetting piece 9 is preferably a compression spring, and is simple, practical and low in cost.

Referring to fig. 5, when the pushing unit 5 is in a closed state, and the distance from the contact surface of the push rod 7 and the pushing unit 5 to the rotation axis is short, due to the existence of the resetting member 9, the push cylinder 8 moves upwards, the push shaft 8-1 pushes the upper push protrusion 11-3-2, so that the clamping protrusion 11-3-1 is close to the lower end surface of the base 10, and the tool unit 12 is installed between the clamping protrusion 11-3-1 and the lower end surface of the base 10, thereby clamping the tool unit 12. When the pushing unit 5 is in an open state, the distance between the contact surface of the push rod 7 and the pushing unit 5 and the rotation axis is longest, the push cylinder 8 moves downwards, the resetting piece 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 far away from the lower end surface of the base 10, and the tool unit 12 is released.

The working mode of the quick-change angle grinder provided by the invention is as follows: the driving main machine 1 runs and drives the output shaft 4 to rotate through gear transmission. The clamping assembly 11 cooperates with the base 10 to clamp the tool unit 12, and the rotation of the output shaft 4 can drive the tool unit 12 to rotate. When the tool unit 12 needs to be replaced, the driving main machine 1 is closed, the pushing unit 5 is opened, the distance between the contact surface of the push rod 7 and the pushing unit 5 and the rotating axis is longest, the push rod 7 is pressed downwards, the push cylinder 8 moves downwards, the resetting piece 9 is compressed, the push shaft 8-1 pushes the lower pushing protrusion 11-3-3, the clamping protrusion 11-3-1 is far away from the lower end face of the base 10, and therefore the tool unit 12 is loosened. After the replacement is finished, the pushing unit 5 is closed, the resetting piece 9 pushes the pushing cylinder 8 to move upwards through elasticity, and the pushing shaft 8-1 pushes the upper pushing bulge 11-3-2, so that the clamping assembly 11 is driven to clamp the tool unit 12 on the lower end face of the base 10.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A quick-change angle grinder is characterized in that: the quick-change gear box comprises a main machine (1), a quick-change front machine shell (2), a gear box cover (3), an output shaft (4), a pushing unit (5), an input gear (6), a push rod (7), a push cylinder (8), a reset piece (9), a base (10), a clamping component (11) and a tool unit (12); the quick-change front shell (2) is fixed at the output end of the main machine (1), and an output gear of the main machine (1) extends into the quick-change front shell (2); the gearbox cover (3) is fixed at the bottom of the quick-change front casing (2); the upper part of the output shaft (4) is rotatably arranged in the quick-change front shell (2), the middle part of the output shaft (4) is rotatably arranged in the gearbox cover (3), and the lower part of the output shaft (4) extends out of the gearbox cover (3); the pushing unit (5) is rotatably arranged at the top of the quick-change front machine shell (2), and a cam part (5-1) is arranged on the pushing unit (5); the input gear (6) is fixedly sleeved on the output shaft (4) and is meshed with the output gear of the main machine (1); the push cylinder (8) is arranged inside the output shaft (4); the push rod (7) penetrates through the top of the quick-change front casing (2), the upper end of the push rod (7) is matched with a cam part (5-1) of the pushing unit (5), and the lower end of the push rod (7) extends into the output shaft (4) to be matched with the push cylinder (8); the reset piece (9) provides upward reset force for the push cylinder (8); the base (10) is fixed at the bottom of the output shaft (4); the clamping component (11) is connected inside the base (10) and matched with the push cylinder (8), and the lower part of the clamping component (11) extends out of the base (10); when the push cylinder (8) moves upwards, the clamping component (11) is driven to clamp the tool unit (12) on the lower end face of the base (10), and when the push cylinder (8) moves downwards, the clamping component (11) releases the tool unit (12).

2. The quick-change angle grinder of claim 1, wherein: the clamping assembly (11) comprises 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 a boss (10-1) extending inwards, and the clamping block seat (11-1) is arranged on the boss (10-1); the rotating shaft (11-2) is fixed on the clamping block seat (11-1); the two clamping blocks (11-3) are rotationally connected to the rotating shaft (11-2); the bottoms of the two clamping blocks (11-3) extend out of the base (10) and are provided with clamping bulges (11-3-1) extending outwards; the extension directions of the clamping bulges (11-3-1) of the two clamping blocks (11-3) are opposite.

3. A quick-change angle grinder as claimed in claim 2, characterized in that: an upper pushing bulge (11-3-2) and a lower pushing bulge (11-3-3) are arranged above the clamping bulges (11-3-1) on the two clamping blocks (11-3) at intervals; a pushing groove is formed between the upper pushing bulge (11-3-2) and the lower pushing bulge (11-3-3); two sides of the bottom of the push cylinder (8) are respectively provided with a push shaft (8-1), and the two push shafts (8-1) are respectively positioned in the push grooves of the two clamping blocks (11-3); when the push cylinder (8) moves upwards, the push shaft (8-1) pushes the upper push protrusion (11-3-2) to enable the clamping protrusion (11-3-1) to be close to the lower end face of the base (10), so that the tool unit (12) is clamped; when the push cylinder (8) moves downwards, the push shaft (8-1) pushes the lower push protrusion (11-3-3) to enable the clamping protrusion (11-3-1) to be far away from the lower end face of the base (10), and therefore the tool unit (12) is loosened.

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

5. The quick-change angle grinder of claim 2, wherein: the reset piece (9) is a pressure spring which is arranged in the push cylinder (8) and pressed on the clamping block seat (11-1).

6. The quick-change angle grinder of claim 1, wherein: the base (10) is in threaded connection with the output shaft (4).

7. The quick-change angle grinder of claim 1, wherein: the input gear (6) and the output gear of the main machine (1) are both bevel gears.

8. The quick-change angle grinder of claim 1, wherein: the upper part of the output shaft (4) is connected with the quick-change front case (2) through an oil-retaining bearing, and the middle part of the output shaft (4) is connected with the gearbox cover (3) through a deep groove ball bearing.

9. The quick-change angle grinder of claim 1, wherein: the outside of the gearbox cover (3) is provided with a quick-release protective cover (14).

10. The quick-change angle grinder of claim 9, wherein: two positioning beads (3-1) are symmetrically arranged on the peripheral surface of the gear box cover (3); two notches (14-1) are symmetrically arranged at the upper part of the quick-release protective cover (14), and a plurality of positioning holes (14-2) are uniformly distributed between the two notches (14-1); the two notches (14-1) and the positioning holes (14-2) are suitable for being matched with the two positioning beads (3-1).