An angle grinder

Abstract

The utility model discloses an angle grinder, including the casing, the casing has the handle and mainframe shell, is equipped with main chamber in mainframe shell, is assembled with drive mechanism in main chamber, drive mechanism includes drive motor and sectional main shaft, and the main shaft includes rotor connecting section, lock axle section and operating part connecting section in proper order, rotor connecting section is directly transmission with the rotor of drive motor, realizes, operating part connecting section extends to the outside of casing and is equipped with polishing subassembly, and the lateral chamber is equipped with the lateral chamber of mainframe shell, and is assembled with lock axle subassembly in it, and the lock pin of lock axle subassembly can be inserted into the lock groove of main shaft lock axle section perpendicularly or will exit lock pin lock groove, to realize the locking and release of main shaft. The utility model discloses through the direct connection of main shaft and motor, has saved bevel gear transmission, and the structure is more compact, and the energy consumption is lower, and through lock axle subassembly has realized the quick locking of main shaft when polishing piece changes, and the operation is convenient, has effectively improved the change efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of power tool technology, and specifically relates to an angle grinder. Background Technology

[0002] An angle grinder, also known as a polishing machine or disc grinder, is an electric abrasive tool used for cutting and grinding fiberglass. Traditional angle grinders typically house the drive motor inside the handle, making the drive motor and handle an integrated unit to reduce the overall size of the angle grinder. The output shaft of the drive motor and the drive shaft of the grinding disc are then connected by a bevel gear for transmission.

[0003] The aforementioned traditional structure has the following disadvantages: the power transmission path is not direct enough, the meshing transmission of bevel gears leads to a certain amount of energy loss, reduces transmission efficiency, and results in a large overall energy consumption; the setting of bevel gear transmission pairs not only increases the number of parts and manufacturing costs, but also occupies valuable space inside the machine housing, affecting the compactness of the angle grinder structure; when changing grinding discs, traditional angle grinders usually require the use of additional tools, such as wrenches, to fix the drive shaft to prevent it from rotating, which is cumbersome, and if the clamping is not stable, the drive shaft will rotate with the clamping plate, which greatly affects the efficiency of grinding disc replacement and the convenience of work. Summary of the Invention

[0004] This invention addresses the aforementioned technical problems by providing an angle grinder with a compact structure, high transmission efficiency, and convenient grinding disc replacement. The objective of this invention is achieved through the following technical solution:

[0005] An angle grinder includes a housing, which includes a handle and a main housing located at the front end of the handle. A main chamber is formed inside the main housing, and a drive mechanism is assembled within the main chamber. The drive mechanism includes a drive motor and a spindle. The spindle is segmented along its axial direction, including a rotor connecting section, a locking shaft section, and an operating component connecting section. The rotor connecting section is tightly fitted with the inner bore of the drive motor's rotor. The operating component connecting section extends to the outside of the main housing and is equipped with a grinding assembly. A locking groove is recessed on the outer peripheral wall of the locking shaft section. A side chamber communicating with the main chamber is formed on the side wall of the main housing, and a locking shaft assembly is assembled within the side chamber. The locking shaft assembly includes a locking pin, the central axis of which is perpendicular to the central axis of the spindle. The locking pin can reciprocate between a locked position and a released position. When the locking pin is in the locked position, its locking end is inserted into the locking groove; when the locking pin is in the released position, its locking end is removed from the locking groove.

[0006] Preferably, the spindle further includes a first support section and a second support section. The first support section is located at the top of the spindle and is rotatably supported on the main housing by a first bearing. The second support section is located between the locking shaft section and the operating component connecting section and is rotatably supported on the main housing by a second bearing.

[0007] Preferably, a fan is also installed in the main chamber, and an impeller assembly section is provided between the rotor connecting section and the locking shaft section, with the impeller of the cooling fan tightly fitted in the impeller assembly section; an air inlet and an air outlet are provided on the main housing, and a cooling air duct communicating with the air inlet and the air outlet is provided in the main chamber, with the impeller of the cooling fan located on the cooling air duct.

[0008] Preferably, the main unit housing includes a first sidewall and a second sidewall disposed opposite to each other, the air inlet is located at the top of the first sidewall, and the air outlet is located at the bottom of the first sidewall.

[0009] Preferably, the grinding assembly includes an upper pressure plate and a lower pressure plate, the upper pressure plate being interference-fitted with the connecting section of the operating component; the end of the connecting section of the operating component is provided with an external thread to form a threaded section, the lower pressure plate being screwed to the threaded section, and the grinding disc being pressed between the upper pressure plate and the lower pressure plate by tightening the lower pressure plate.

[0010] Preferably, the polishing assembly further includes a protective cover, which includes a mounting portion fixed to the main housing and a semi-circular cover body surrounding the radial outer side of the polishing assembly.

[0011] Preferably, the side chamber is formed on the second side wall and includes an outer chamber and an inner chamber arranged coaxially from the outside to the inside, and the inner diameter of the outer chamber is larger than the inner diameter of the inner chamber; the locking pin also includes an operating end, and a button is fixedly provided on the operating end; the button is housed in the outer chamber, and its outer diameter is adapted to the inner diameter of the outer chamber, and the axial depth of the outer chamber is used to limit the pressing stroke of the button.

[0012] Preferably, the housing is composed of an integral left housing and an integral right housing; the housing also includes a battery holder formed at the rear end of the handle.

[0013] Preferably, a control circuit board is provided inside the handle, and a control switch electrically connected to the control circuit board is provided on the outer wall of the handle; an auxiliary handle is detachably installed on the first side wall.

[0014] Compared with the prior art, this utility model has the following technical effects: direct and efficient transmission, compact structure, the rotor of the drive motor and the main shaft are directly connected by a tight fit, simplifying the transmission chain, reducing energy loss in the transmission process, improving transmission efficiency and energy efficiency, and significantly simplifying the internal structure, reducing the number of parts, making the overall structure of the angle grinder more compact and lightweight; the shaft locking assembly is easy to operate, when changing the grinding disc, push the locking pin into the locking position to firmly lock the main shaft, making grinding disc replacement convenient and efficient; the cooling fan is integrated on the main shaft, eliminating the need for additional power, resulting in high efficiency and energy saving; the housing is composed of an integrated left housing and an integrated right housing, facilitating disassembly and maintenance. Attached Figure Description

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

[0016] Figure 2 This is another structural schematic diagram of the present invention;

[0017] Figure 3 This is a cross-sectional view of the present invention;

[0018] Figure 4 This is a schematic diagram of the internal structure of the main casing of this utility model;

[0019] Figure 5 This is a schematic diagram of the main shaft structure in this utility model;

[0020] The diagram shows: handle 1; main body housing 2; main chamber 21; control switch 11; battery holder 12; drive motor 3; main shaft 4; first support section 41; rotor connecting section 42; impeller assembly section 43; locking shaft section 44; locking groove 441; second support section 45; operating component connecting section 46; first bearing 51; second bearing 52; cooling fan 6; side chamber 24; locking pin 81; button 82; air inlet 221; air outlet 222; upper pressure plate 71; lower pressure plate 72; protective cover 73; auxiliary handle 9. Detailed Implementation

[0021] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings:

[0022] See Figures 1-5 This embodiment discloses an angle grinder, which includes a housing. The housing is composed of an integrally formed left housing and a right housing. It mainly includes a handle 1 and a main housing 2 located at the front end of the handle 1. A control circuit board is provided inside the handle 1, and a control switch 11 electrically connected to the control circuit board is installed on its outer wall. A battery holder 12 for installing a battery is formed at the rear end of the handle 1. A main chamber 21 is formed inside the main housing 2 for accommodating the drive mechanism.

[0023] The drive mechanism includes a drive motor 3 and a main shaft 4. The main shaft 4 adopts a segmented design along its axial direction, and from the top to the bottom, it includes a first support section 41, a rotor connection section 42, an impeller assembly section 43, a shaft locking section 44, a second support section 45, and an operating component connection section 46.

[0024] The first support section 41 is rotatably supported on the top of the main housing 2 via the first bearing 51; the rotor connecting section 42 is directly and tightly fitted into the rotor inner hole of the drive motor 3 to achieve direct power transmission without gear conversion; the impeller assembly section 43 is tightly fitted with the impeller of the cooling fan 6; a ring-shaped locking groove 441 is recessed on the outer peripheral wall of the locking shaft section 44; the second support section 45 is rotatably supported on the main housing 2 via the second bearing 52; the operating component connecting section 46 extends to the outside of the main housing 2 for installing the grinding components.

[0025] In order to lock the spindle 4, a side chamber 24 communicating with the main chamber 21 is formed on the second side wall 23 of the main housing 2. The side chamber 24 comprises an outer chamber and an inner chamber, which are coaxial and have different inner diameters, from the outside to the inside. The inner diameter of the outer chamber is larger than that of the inner chamber. The locking shaft assembly is assembled in the side chamber 24 and includes a locking pin 81 and a button 82. The central axis of the locking pin 81 is perpendicular to the central axis of the main shaft 4, and the button 82 is fixed at its operating end. The button 82 is housed in the outer chamber, and its outer diameter matches the inner diameter of the outer chamber. The axial depth of the outer chamber limits the pressing stroke of the button 82. The locking pin 81 can reciprocate between the locked position and the released position. When the button 82 is pressed to the locked position, the locking end of the locking pin 81 is inserted into the locking groove 441 of the main shaft locking shaft section 44, preventing the main shaft from rotating. When the button 82 is released, the locking pin is reset to the released position by the internal spring, and the locking end of the locking pin 81 exits the locking groove 441, allowing the main shaft to rotate freely.

[0026] The top and bottom of the first side wall 22 of the main housing 2 are respectively provided with an air inlet 221 and an air outlet 222; a cooling air duct connecting the air inlet 221 and the air outlet 222 is formed in the main chamber 21; when the main shaft 4 drives the impeller to rotate, the airflow is drawn in from the air inlet 221, flows through the heat-generating components such as the drive motor 3, and is discharged from the air outlet 222, thereby achieving effective heat dissipation.

[0027] The grinding assembly includes an upper pressure plate 71, a lower pressure plate 72, and a protective cover 73. The upper pressure plate 71 is interference-fitted with the operating component connecting section 46 of the spindle 4; the end of the operating component connecting section 46 is machined with an external thread to form a threaded section, and the lower pressure plate 72 is connected to the threaded section through its internal thread; the grinding disc (not shown) is clamped between the upper pressure plate 71 and the lower pressure plate 72, and the grinding disc can be pressed by tightening the lower pressure plate 72; the protective cover 73 is fixed to the bottom of the main housing 2 through its mounting part, and its semi-circular cover surrounds the radial outer side of the grinding assembly, providing a safety protection function.

[0028] When changing the grinding disc, the user only needs to press the button 82 of the locking shaft assembly inward to make the locking pin 81 engage in the locking groove 441 of the spindle, and the spindle will be locked. At this time, the pressure plate 72 can be loosened by hand or general tool, and then tightened after changing the grinding disc. The operation is very convenient. When working, release the button 82, and the locking pin will exit the locking groove under the action of the return spring, and the spindle can rotate normally under the drive motor.

[0029] An auxiliary handle 9 can also be detachably installed on the first side wall 22 of the main housing 2 to facilitate operation by the user at different angles.

[0030] It should be understood that in the claims and description of this utility model, all instances of "comprising..." should be understood as having an open-ended meaning, that is, equivalent to "at least comprising...", and should not be understood as having a closed-ended meaning, that is, its meaning should not be understood as "only comprising...". The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0031] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model should be included within the protection scope of this utility model.

Claims

1. An angle grinder, characterized in that, It includes a housing, which includes a handle and a main housing located at the front end of the handle. A main chamber is formed inside the main housing, and a drive mechanism is assembled within the main chamber. The drive mechanism includes a drive motor and a spindle. The spindle is segmented along its axial direction, including a rotor connecting section, a locking shaft section, and an operating component connecting section. The rotor connecting section is tightly fitted with the inner hole of the drive motor's rotor. The operating component connecting section extends to the outside of the main housing and is equipped with a grinding assembly. A locking groove is recessed on the outer peripheral wall of the locking shaft section. A side chamber communicating with the main chamber is formed on the side wall of the main housing, and a locking shaft assembly is assembled within the side chamber. The locking shaft assembly includes a locking pin, the central axis of which is perpendicular to the central axis of the spindle. The locking pin can reciprocate between a locked position and a released position. When the locking pin is in the locked position, its locking end is inserted into the locking groove; when the locking pin is in the released position, its locking end is removed from the locking groove.

2. The angle grinder according to claim 1, characterized in that, The main shaft further includes a first support section and a second support section. The first support section is located at the top of the main shaft and is rotatably supported on the main housing by a first bearing. The second support section is located between the locking shaft section and the operating component connecting section and is rotatably supported on the main housing by a second bearing.

3. An angle grinder according to claim 2, characterized in that, The main chamber is also equipped with a fan, and an impeller assembly section is provided between the rotor connecting section and the locking shaft section. The impeller of the cooling fan is tightly fitted in the impeller assembly section. An air inlet and an air outlet are provided on the main housing. A cooling air duct is provided in the main chamber and communicates with the air inlet and the air outlet. The impeller of the cooling fan is located on the cooling air duct.

4. An angle grinder according to claim 3, characterized in that, The main unit housing includes a first sidewall and a second sidewall disposed opposite to each other, the air inlet is located at the top of the first sidewall, and the air outlet is located at the bottom of the first sidewall.

5. An angle grinder according to claim 4, characterized in that, The grinding assembly includes an upper pressure plate and a lower pressure plate. The upper pressure plate is interference-fitted with the connecting section of the operating component. The end of the connecting section of the operating component is provided with an external thread to form a threaded section. The lower pressure plate is screwed to the threaded section, and the grinding disc is pressed between the upper pressure plate and the lower pressure plate by tightening the lower pressure plate.

6. An angle grinder according to claim 5, characterized in that, The polishing assembly also includes a protective cover, which includes a mounting part fixed to the main housing and a semi-circular cover body surrounding the radial outer side of the polishing assembly.

7. An angle grinder according to any one of claims 1-6, characterized in that, The side chamber is formed on the second side wall and includes an outer chamber and an inner chamber arranged coaxially from the outside to the inside, and the inner diameter of the outer chamber is larger than the inner diameter of the inner chamber; the locking pin also includes an operating end, and a button is fixedly provided on the operating end; the button is housed in the outer chamber and its outer diameter is adapted to the inner diameter of the outer chamber, and the axial depth of the outer chamber is used to limit the pressing stroke of the button.

8. An angle grinder according to claim 1, characterized in that, The housing is composed of a one-piece left housing and a one-piece right housing; the housing also includes a battery holder formed at the rear end of the handle.

9. An angle grinder according to claim 4, characterized in that, A control circuit board is provided inside the handle, and a control switch electrically connected to the control circuit board is provided on the outer wall of the handle; an auxiliary handle is detachably installed on the first side wall.

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