Angle grinder

Abstract

The utility model relates to an angle grinder which comprises a shell, the shell is provided with a first barrel-shaped part containing a motor assembly, a second barrel-shaped part connected to the right end of the first barrel-shaped part and a gear box connected to the left end of the first barrel-shaped part, the second barrel-shaped part is provided with a through air inlet, and the motor assembly drives a fan to rotate. The angle grinder is provided with an end cover connected to the air inlet and a dustproof mechanism covering the air inlet, the dustproof mechanism is connected to the second barrel-shaped part through a magnetic attraction assembly, the end cover is provided with an annular base ring and positioning grooves formed in the circumferential surface of the base ring at intervals, and the positioning grooves are communicated with the end cover. The dustproof mechanism is provided with a rectangular frame body and positioning blocks arranged on the surface of the frame body at intervals, the magnetic attraction assembly comprises first magnetic blocks installed between the multiple positioning blocks and second magnetic blocks installed between the multiple positioning grooves, the first magnetic blocks abut against the second magnetic blocks, and the positioning blocks are clamped in the positioning grooves.

Description

[Technical field]

[0001] The utility model relates to the technical field of electric tools, in particular to an angle grinder with a quick-detachable dustproof mechanism. [Background Technology]

[0002] An angle grinder is an electric tool that uses a motor assembly to provide power to drive the transmission assembly to drive the top tool for grinding operations. It is popular among users because of its portability and high operating efficiency. However, during operation, the angle grinder will inhale external cooling airflow through the fan at the front end of the motor assembly. This cooling airflow often carries the dust generated by the angle grinder operation into the machine, seriously affecting the operation of the motor.

[0003] In order to prevent dust, angle grinders often add a filter at the air inlet, and the filter holes in the filter can effectively intercept dust in the cooling airflow. However, most existing filters are connected to the rear cover of the angle grinder by pull-out or flip-over with buckles, and most of these connections are interference fits. If users want to remove the filter, they need to apply a lot of force, which is laborious and has a poor experience.

[0004] In view of this, it is determined necessary to provide an improved angle grinder to overcome the defects of the prior art. [Contents of the utility model]

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide an angle grinder with a quick-detachable dustproof mechanism, which has the advantages of easy disassembly and assembly and good user experience.

[0006] The utility model solves the problems of the prior art by adopting the following technical scheme: an angle grinder comprises a shell, the shell having a first cylindrical portion for accommodating a motor assembly, a second cylindrical portion connected to the right end of the first cylindrical portion, and a gear box connected to the left end of the first cylindrical portion, the second cylindrical portion having an air inlet passing therethrough, the motor assembly drives a fan to rotate, guides an external cooling airflow to enter from the air inlet, and discharges the air through the gear box, the angle grinder comprises an end cover connected to the air inlet and a dustproof mechanism covering the air inlet, the dustproof mechanism being connected to the second cylindrical portion via a magnetic attraction component, the end cover having a base ring in the shape of an annular ring and positioning grooves arranged at intervals on the circumferential surface of the base ring, the dustproof mechanism having a rectangular frame and positioning blocks arranged at intervals on the surface of the frame, the magnetic attraction component comprising a first magnetic block installed between a plurality of the positioning blocks and a second magnetic block installed between the plurality of the positioning grooves, the first magnetic block being adsorbed on the second magnetic block, and the positioning block being clamped in the positioning groove.

[0007] A further improved solution is: the end cover has a first receiving groove arranged between the multiple positioning grooves, the frame has a second receiving groove arranged between the multiple positioning blocks, the first magnetic block is installed in the second receiving groove, and the second magnetic block is installed in the first receiving groove.

[0008] A further improvement is as follows: the air inlet has a pair of first surfaces parallel to each other and a second surface connected between the pair of first surfaces, the first surface is concave to form a slide rail, the second surface is concave to form a slot, the dustproof mechanism includes a pair of guide members arranged at the upper and lower ends of the frame and an insert plate arranged at the left end of the frame, the guide member moves in the slide rail, and the insert plate is inserted into the slot.

[0009] A further improved solution is: the dustproof mechanism has a first through slot and a second through slot that penetrate the frame, and the first magnetic block is located between the first through slot and the second through slot.

[0010] A further improvement is as follows: the dustproof mechanism is provided with a first convex rib and a second convex rib spaced apart from each other on the surface of the frame, the second through groove is located between the first convex rib and the second convex rib, the first magnetic block abuts against the first convex rib, and the second convex rib can be used for the user to apply force.

[0011] A further improvement is as follows: the end cover abuts against the end of the first surface away from the second surface, and the axial end surface of the end cover is parallel to the second surface.

[0012] A further improvement is that the second magnetic block and the positioning groove are exposed to the air inlet.

[0013] A further improvement is that the circumferential surface of the frame body abuts against the first surface and the second surface.

[0014] A further improvement is as follows: the end cover has ribs arranged inside the base ring and guide ribs formed on the left end surface of the base ring, the ribs define an auxiliary air inlet, the opening direction of the auxiliary air inlet is perpendicular to the opening direction of the air inlet, and the guide ribs guide the flow of external cooling airflow.

[0015] A further improvement is as follows: the dust-proof mechanism has a filter screen installed on the first through slot, and the filter screen is provided with filter holes for blocking dust particles.

[0016] Compared with the prior art, the utility model has the following beneficial effects: the dustproof mechanism of the angle grinder and the end cover of the second cylindrical part are connected through a magnetic suction component, and the dustproof mechanism can slide at the air inlet, which is convenient for disassembly and assembly and can also enhance the user experience; the first magnetic block of the magnetic suction component is installed in the second accommodating groove on the dustproof mechanism, and the second magnetic block is installed in the first accommodating groove on the end cover, and the dustproof mechanism is provided with a positioning block, and the end cover is provided with a positioning groove, and the connection between the dustproof mechanism and the end cover can be achieved through the adsorption between the first magnetic block and the second magnetic block and the clamping action between the positioning block and the positioning groove, and the structure is simple and easy to manufacture; the dustproof mechanism is provided with a guide member and an insert, and the air inlet is provided with a slide rail and a slot for cooperating with the guide member and the insert, which is used to move the dustproof mechanism in the air inlet only by pushing and pulling, and the connection of the dustproof mechanism is stable and convenient for user operation. [Drawings]

[0017] The specific implementation of the utility model is further described in detail below in conjunction with the accompanying drawings:

[0018] Figure 1 It is a three-dimensional schematic diagram of the angle grinder in the utility model;

[0019] Figure 2 yes Figure 1 A schematic structural diagram of the second cylindrical portion in the angle grinder shown;

[0020] Figure 3 yes Figure 2 An enlarged view of the connection between the air inlet and the cover plate in the second cylindrical portion;

[0021] Figure 4 yes Figure 2 An enlarged view of another part of the air inlet in the second cylindrical portion;

[0022] Figure 5 yes Figure 1 The schematic diagram of the structure of the dust prevention mechanism in the angle grinder shown;

[0023] Figure 6 yes Figure 5 A partial enlarged view of the dustproof structure shown.

[0024] Meaning of the reference numerals in the figures:

[0025] Angle grinder 100 housing 1

[0026] First cylindrical part 11 Second cylindrical part 12

[0027] Air inlet 121 First surface 121a

[0028] Second surface 121b Slide rail 121c

[0029] Slot 121d End cover 122

[0030] Base ring 122a Ribs 122b

[0031] Auxiliary air inlet 122c positioning groove 122d

[0032] The first receiving groove 122e and the guide rib 122f

[0033] Power hole 122g gear box 13

[0034] Top tool 2 Protective cover 3

[0035] Dust-proof mechanism 4 frame 41

[0036] Guide 41a Insert 41b

[0037] First through groove 411 Second through groove 412

[0038] First area 413 Second area 414

[0039] First convex rib 415 Second convex rib 416

[0040] Positioning block 417 Second receiving groove 418

[0041] Filter 42 Bar 421

[0042] Filter hole 422 Magnetic component 5

[0043] First magnetic block 51 Second magnetic block 52 [Specific implementation method]

[0044] The terms used in the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. For example, the words "upper", "lower", "front", "back", etc., which indicate the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0045] See also Figure 1The embodiment of the utility model relates to an angle grinder 100, which is used for grinding and cutting workpieces such as metal and stone. The housing 1 of the angle grinder 100 is a three-section structure, including a first cylindrical portion 11 accommodating a motor assembly (not shown), a second cylindrical portion 12 connected to the right end of the first cylindrical portion 11, and a gear box 13 connected to the left end of the first cylindrical portion 11 and accommodating a transmission assembly (not shown). The motor assembly can drive the transmission assembly to operate to drive the top tool 2 at the lower end of the gear box 13 to operate on the workpiece. The top tool 2 can be a cutting disc or a grinding disc.

[0046] If the angle grinder 100 is not operated properly, the top tool 2 may break. If the broken metal fragments splash onto the user, the user may be easily injured. Therefore, a protective cover 3 needs to be provided on the outside of the top tool 2. The protective cover 3 is preferably a quick-change type, so that the user does not need tools when replacing the protective cover 3, which is easy to operate and saves time.

[0047] Meanwhile, during the operation of the angle grinder 100, the operation of the motor assembly drives the fan (not shown) at the front end to operate in coordination, so as to draw the external cooling airflow from the second cylindrical portion 12 and discharge it through the gear box 13. However, this part of the cooling airflow often carries a large amount of dust. If the dust is adsorbed by the motor assembly and accumulates to a certain amount, the angle grinder 100 will not work. Therefore, in this embodiment, the second cylindrical portion 12 is provided with a dust prevention mechanism 4 to intercept the dust.

[0048] Please refer to Figures 2 to 5 The second cylindrical portion 12 has a pair of air inlets 121 extending in the front-to-back direction. The air inlet 121 defines a pair of first surfaces 121a extending in the left-right direction and a second surface 121b perpendicular to the first surface 121a. The first surface 121a is recessed inwardly with a slide rail 121c arranged in the left-right direction, and the second surface 121b is recessed inwardly with a slot 121d arranged in the up-down direction. An opening for installing the end cover 122 is formed on the side of the air inlet away from the second surface 121b.

[0049] As for the entire second cylindrical portion 12, the end cover 122 is located at the far right, including a base ring 122a in an annular shape and a plurality of ribs 122b formed inside the base ring 122a. These ribs 122b extend in the front-to-back direction or in the up-to-down direction. In this embodiment, most of the ribs 122b inside the base ring 122a extend in the front-to-back direction and divide the upper and lower spaces of the base ring 122a into a plurality of equal areas. Only one rib 122b extends downward from the upper vertex of the base ring 122a. This rib 122b extending up and down and the front and rear ribs 122b extend downward from the upper vertex of the base ring 122a. The extended ribs 122b are arranged to form an auxiliary air inlet 122c, and the double-sided air intake through the air inlet 121 and the auxiliary air inlet 122c can increase the intake amount of the cooling airflow; at the same time, the left end face of the base ring 122a is integrated with a plurality of guide ribs (122f), and the cooling airflow entering the second cylindrical portion 12 from the auxiliary air inlet 122c flows to the motor assembly via the guide ribs 122f; the end cover 122 is also provided with a power hole 122g on the right side of the rib 122b, and the power cord and the power sheath can be connected to the switch assembly for controlling the start and stop of the motor assembly through the power hole.

[0050] Combination Figure 2 and Figure 3 After the end cover 122 is installed on the second cylindrical portion 12, its left and right end faces are parallel to the second surface 121b, and the circumferential surface is in contact with the right end of the first surface 121a. Further, a plurality of radially inwardly recessed positioning grooves 122d are provided on the circumferential surface of the end cover 122. The number of positioning grooves 122d is preferably four. It is worth noting that the four positioning grooves 122d are not arranged at equal intervals, but are arranged in groups of two. The spacing between the two positioning grooves 122d in a group is small, while there is a large spacing between the groups. This is because a first receiving groove 122e is provided between the two groups of positioning grooves 122d. Both the positioning groove 122d and the first receiving groove 122e need to be exposed from the air inlet 121. The function of the first receiving groove 122e will be described in more detail below.

[0051] Combination Figure 1 , Figure 4 and Figure 5 The dustproof mechanism 4 is installed at the air inlet 121, and the dustproof mechanism 4 covers the air inlet 121. The dustproof mechanism 4 has a rectangular frame 41 and a filter 42 installed on the frame 41. The frame 41 has a long strip-shaped guide 41a formed on the upper and lower end surfaces and an insert 41b formed on the left end surface. The width of the guide 41a in the front-to-back direction is not less than the width of the slide rail 121c in the front-to-back direction, and the width of the insert 41b in the front-to-back direction is not less than the width of the slot 121d in the front-to-back direction.

[0052] Furthermore, the frame 41 has a first through slot 411 and a second through slot 412 that penetrate from front to back, and the filter 42 is installed in the first through slot 411. The filter 42 is composed of two groups of inclined bars 421, and the two groups of bars 421 intersect to form a plurality of filter holes 422, which can intercept dust in the cooling airflow. The first through slot 411 extends to the right from the left end of the frame 41, occupying most of the surface area of ​​the frame 41, and the second through slot 412 is integrated on the right side of the frame 41, extending from the upper side of the frame 41 to the lower side of the frame 41, and the width in the left and right directions is extremely small. The combined action of the first through slot 411 and the second through slot 412 divides the right side area of ​​the first through slot 411 into a first area 413 and a second area 414, wherein the first area 413 is located between the first through slot 411 and the second through slot 412, and the second area 414 is located on the right side of the second through slot 412. In the first area 413, near the left side of the first through groove 411, the frame 41 has a positioning block 417 protruding backward. Similar to the positioning groove 122d, there are four positioning blocks 417, which are divided into two groups. One group is located on the upper side of the first area 413, and the other group is located on the lower side of the first area 413. A second accommodating groove 418 is arranged between the two groups of positioning blocks 417.

[0053] In order to achieve quick connection and release between the dustproof mechanism 4 and the second cylindrical portion 12, a magnetic attraction component 5 is provided in this embodiment. The magnetic attraction component 5 includes a second magnetic block 52 installed in the first accommodating groove 122e and a first magnetic block 51 installed in the second accommodating groove 418. The magnetic properties of the first magnetic block 51 and the second magnetic block 52 are opposite; at the same time, a first rib 415 is provided on the right side of the first area 413, and a second rib 416 protrudes from the left side of the second area 414. The first rib 415 abuts against the first magnetic block 51, and the second rib 416 abuts against the edge of the second through groove 412.

[0054] When installing the dustproof mechanism 4 to the second cylindrical portion 12, the user can grasp the second rib 416, hold the fingers against the second through groove 412, and then insert the guide 41a into the slide rail 121c, at which time the upper and lower surfaces of the frame 41 abut against the first surface 121a; then, the user can push the dustproof mechanism 4 to make the guide 41a slide in the slide rail 121c until the insert 41b is inserted into the slot 121d, at which time the left end surface of the frame 41 abuts against the first and second surfaces 121b; In this case, the dustproof mechanism 4 is not yet completely and firmly connected to the air inlet 121 and the end cover 122, and the user needs to press the positioning block 417 to make it snap into the positioning groove 122d and make the first magnetic block 51 adsorbed on the second magnetic block 52 to complete the fixation of the dustproof mechanism 4; similarly, if the user wants to remove the dustproof mechanism 4, he can directly apply force to the second rib 416 to separate the first magnetic block 51 from the second magnetic block 52, and pull the frame 41 to the right to disengage it from the slot 121d and the slide rail 121c.

[0055] The present invention is not limited to the above specific implementations. A person skilled in the art can easily understand that there are many alternatives to the angle grinder of the present invention without departing from the principle and scope of the present invention. The protection scope of the present invention shall be subject to the content of the claims.

Claims

1. An angle grinder, comprising a housing, the housing having a first cylindrical portion for accommodating a motor assembly, a second cylindrical portion connected to the right end of the first cylindrical portion, and a gear box connected to the left end of the first cylindrical portion, the second cylindrical portion having an air inlet passing therethrough, the motor assembly driving a fan to rotate, guiding an external cooling airflow to enter from the air inlet, and to be discharged through the gear box; characterized in that: The angle grinder has an end cover connected to the air inlet and a dustproof mechanism covering the air inlet, the dustproof mechanism is connected to the second cylindrical portion via a magnetic attraction component, the end cover has a circular base ring and positioning grooves spaced apart on the circumferential surface of the base ring, the dustproof mechanism has a rectangular frame and positioning blocks spaced apart on the surface of the frame, the magnetic attraction component includes a first magnetic block installed between a plurality of the positioning blocks and a second magnetic block installed between the plurality of the positioning grooves, the first magnetic block is adsorbed on the second magnetic block, and the positioning block is clamped in the positioning groove.

2. The angle grinder according to claim 1, characterized in that: The end cover has a first receiving groove arranged between the plurality of positioning grooves, the frame has a second receiving groove arranged between the plurality of positioning blocks, the first magnetic block is installed in the second receiving groove, and the second magnetic block is installed in the first receiving groove.

3. The angle grinder according to claim 2, characterized in that: The air inlet has a pair of first surfaces parallel to each other and a second surface connected between the pair of first surfaces, the first surface is concave to form a slide rail, and the second surface is concave to form a slot, and the dustproof mechanism includes a pair of guide members arranged at the upper and lower ends of the frame and an insert plate arranged at the left end of the frame, the guide member moves in the slide rail, and the insert plate is inserted into the slot.

4. The angle grinder according to claim 2, characterized in that: The dustproof mechanism has a first through slot and a second through slot penetrating the frame body, and the first magnetic block is located between the first through slot and the second through slot.

5. The angle grinder according to claim 4, characterized in that: The dustproof mechanism is provided with a first convex rib and a second convex rib spaced apart from each other on the surface of the frame, the second through groove is located between the first convex rib and the second convex rib, the first magnetic block abuts against the first convex rib, and the second convex rib can be used for a user to apply force.

6. The angle grinder according to claim 3, characterized in that: The end cover abuts against an end portion of the first surface away from the second surface, and an axial end surface of the end cover is parallel to the second surface.

7. The angle grinder according to claim 6, characterized in that: The second magnetic block and the positioning groove are exposed to the air inlet.

8. The angle grinder according to claim 7, characterized in that: The circumferential surface of the frame body abuts against the first surface and the second surface.

9. The angle grinder according to claim 6, characterized in that: The end cover has ribs arranged inside the base ring and guide ribs formed on the left end surface of the base ring, the ribs define an auxiliary air inlet, the opening direction of the auxiliary air inlet is perpendicular to the opening direction of the air inlet, and the guide ribs guide the flow of external cooling airflow.

10. The angle grinder according to claim 4, characterized in that: The dustproof mechanism comprises a filter screen installed on the first through slot, and the filter screen is provided with filter holes for blocking dust particles.

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