A high-efficiency brushless angle grinder and its use process

Abstract

The invention discloses a high-efficiency brushless angle grinder and a use process thereof, comprising a shell, an output shaft and a bevel gear; a clutch meshing with the bevel gear is slidably provided on the output shaft, and a clutch spring is provided between the clutch and the shell; a driving rod for driving the clutch to disengage from the bevel gear is slidably provided in the output shaft, and the driving rod is provided with a plurality of driving pins cooperating with the clutch; a plurality of ejector pins cooperating with a clamping plate are slidably provided at the end of the output shaft, and the clamping plate is provided with a tapered hole contacting with the ejector pin; a driving inclined surface contacting with the ejector pin is provided on the driving rod, and after the driving inclined surface contacts one end of the ejector pin, the other end of the ejector pin contacts with the tapered hole, thereby locking the clamping plate, so that the clamping plate clamps the cutting plate; the invention provides a high-efficiency brushless angle grinder, and a quick tightening mechanism cooperating with the clamping plate is provided at the output shaft end of the angle grinder, thereby realizing quick disassembly and replacement of the cutting plate of the angle grinder.

Description

Technical Field

[0001] The invention relates to the technical field of electric tools, in particular to a high-efficiency brushless angle grinder and a use process thereof. Background Art

[0002] A brushless angle grinder is a commonly used electric cutting tool. It uses a brushless motor and a bevel gear to transmit power to the output shaft, so that the output shaft rotates at high speed to drive the cutting blade to cut or grind the workpiece.

[0003] Existing angle grinders have the following disadvantages and shortcomings:

[0004] 1. The installation of the cutting disc usually adopts the method of tightening the compression nut and the thread at the end of the output shaft, so that the cutting disc is installed on the output shaft to realize power transmission. However, the fixing method of thread tightening requires the use of external tools to tighten the nut. The replacement takes a long time and consumes a certain amount of labor, which is not conducive to the efficient use of the angle grinder.

[0005] 2. When the cutting disc is replaced, the angle grinder may still be powered on. If the switch is accidentally touched to start the angle grinder, it may easily cause accidental injury to the operator and may also cause unnecessary damage to the angle grinder. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a high-efficiency brushless angle grinder and a process for using the same, thereby solving the problem of the output shaft being disengaged from the power component when the cutting blade of the angle grinder is replaced, thereby improving its safety, and improving the efficiency of replacing the cutting blade by a quick and convenient cutting blade locking method.

[0007] To solve the above technical problems, the present invention solves them through the following technical solutions: a high-efficiency brushless angle grinder, comprising a housing, an output shaft rotatably arranged in the housing, and a bevel gear matched with a brushless motor and rotatably arranged on the output shaft.

[0008] In the above scheme, preferably, a clutch meshing with the bevel gear is slidably provided on the output shaft, and a clutch spring is provided between the clutch and the housing;

[0009] A driving rod is slidably disposed in the output shaft to drive the clutch to disengage from the bevel gear, and a plurality of driving pins cooperating with the clutch are disposed on the driving rod;

[0010] The output shaft end is slidably provided with a plurality of ejector pins cooperating with the clamping sheet, and the clamping sheet is provided with tapered holes contacting with the ejector pins;

[0011] The driving rod is provided with a driving inclined surface that contacts the ejector pin. After the driving inclined surface contacts one end of the ejector pin, the other end of the ejector pin contacts the tapered hole to lock the clamping sheet, so that the clamping sheet clamps the cutting sheet.

[0012] In the above scheme, preferably, the clutch is provided with a first slide groove matched with the driving pin, one end of the driving pin is fixed to the driving rod, and the other end is placed in the first slide groove.

[0013] In the above solution, preferably, the output shaft is provided with a second sliding groove for the driving pin to move.

[0014] In the above solution, preferably, the bevel gear is provided with a first tooth portion, and the clutch is provided with a second tooth portion meshing with the first tooth portion.

[0015] In the above solution, preferably, the driving rod is provided with a reset surface connected with the driving inclined surface, and the reset surface is provided with a magnetic material for absorbing the sliding of the ejector pin.

[0016] In the above scheme, preferably, the upper end of the driving rod is provided with a driving unit after passing through the shell, and the driving unit includes a pressing plate sleeved on the driving rod, and a pressing block is slidably provided on the shell, and one end of the pressing plate is rotatably sleeved on the driving rod, and the other end is connected to the pressing plate;

[0017] The shell is provided with a guide hole for the pressing block to slide.

[0018] In the above solution, preferably, an adjusting screw that cooperates with the thread of the pressing block is rotatably provided on the shell, and the adjusting screw rotates to make the pressing block drive the driving rod to slide upward or downward.

[0019] In the above scheme, preferably, a swing arm for driving the pressure block to slide is rotatably provided on the shell, a return spring is provided between the pressure block and the shell, and a clamping block is provided on the swing arm to abut against the pressure block after rotation.

[0020] In the above solution, preferably, the driving rod is provided with a rotation groove that matches with the pressure plate.

[0021] In the above scheme, preferably, a use process of a high-efficiency brushless angle grinder is as follows:

[0022] S1: When installing the cutting disc, push the drive rod toward the end of the output shaft, and the drive pin drives the clutch to slide and disengage the clutch from the bevel gear;

[0023] S2: After the driving rod slides, the reset surface absorbs the ejector pin, causing the ejector pin to slide toward the axis of the output shaft, and then the cutting disc and the pressing disc are installed from the shaft end of the output shaft in sequence;

[0024] S3: After the cutting disc is installed, the driving rod is reset and slid by the elastic force of the clutch spring, so that the driving inclined surface touches the top pin. After the top pin is subjected to the top contact force, it slides and abuts against the tapered hole, thereby locking the clamping disc. At the same time, the clutch re-engages with the bevel gear to realize power transmission.

[0025] The beneficial effects of the present invention are as follows: the present invention provides a high-efficiency brushless angle grinder, and a quick tightening mechanism cooperating with a clamping plate is arranged at the output shaft end of the angle grinder, thereby realizing the quick disassembly and replacement of the cutting disc of the angle grinder; at the same time, when the cutting disc is unlocked or installed, the output shaft and the transmission bevel gear of the angle grinder are synchronously disengaged, thereby improving the safety during replacement and greatly improving the use efficiency of the angle grinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0027] Figure 2 This is a schematic cross-sectional structural diagram of Example 1 of the present invention.

[0028] Figure 3 For the present invention Figure 2 Schematic diagram of the local enlarged structure at point A in the middle.

[0029] Figure 4 It is a schematic diagram of the explosion structure at the output shaft and the bevel gear in Example 1 of the present invention.

[0030] Figure 5 It is a schematic diagram of the three-dimensional structure of the clutch of the present invention.

[0031] Figure 6 This is the front view of embodiment 2 of the present invention.

[0032] Figure 7 This is a schematic diagram of the partial explosion structure of Example 2 of the present invention.

[0033] Figure 8 It is a schematic diagram of the three-dimensional structure of the swing arm in Example 2 of the present invention. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0035] Example 1: See Figure 1-Figure 5 .

[0036] A high-efficiency brushless angle grinder comprises a housing, an output shaft 1 rotatably arranged in the housing, and a bevel gear 2 matched with a brushless motor and rotatably arranged on the output shaft 1. The brushless motor realizes power transmission through the engagement of a small bevel gear with the bevel gear 2, so that the bevel gear 2 is rotated through transmission after the brushless motor is started.

[0037] The output shaft 1 is rotatably arranged in the housing, and the output shaft 1 is axially positioned by a limit spring or a bearing so that it cannot move in the housing. In addition, the transmission shaft is conventionally arranged and will not be described in detail here.

[0038] The bevel gear 2 is rotatably sleeved on the output shaft 1, and a clutch 101 meshing with the bevel gear 2 is slidably provided on the output shaft 1. Specifically, the clutch 101 cooperates with the outer wall of the output shaft 1 through a spline, that is, the clutch 101 can slide relative to the output shaft 1 but cannot rotate relative to it. Figure 2-3 As shown, the upper end surface of the clutch 101 is provided with a second tooth portion 202, and the lower end surface of the bevel gear 2 is provided with a first tooth portion 201 meshing with the second tooth portion 202. When the second tooth portion 202 is meshed with the first tooth portion 201, the bevel gear 2 can drive the output shaft 1 to rotate synchronously through the clutch 101. When the clutch 101 slides downward along the output shaft 1, the first tooth portion 201 and the second tooth portion 202 are disengaged. At this time, the bevel gear 2 and the output shaft 1 are in a relatively rotatable state.

[0039] The first tooth portion 201 and the second tooth portion 202 each include three annular bosses evenly arranged around the circumference, the boss circumferential angle is preferably 60°, and an inclination angle is set at both ends of the boss. A clutch spring 102 is arranged between the lower end surface of the clutch 101 and the housing. When the resistance of the output shaft 1 increases to a certain extent, the second tooth portion 202 on the clutch 101 can overcome the resistance of the clutch spring 102 and slide relative to the first tooth portion 201, thereby achieving the disengagement of the clutch 101 and the bevel gear 2.

[0040] The output shaft 1 is a hollow shaft, and a driving rod 3 is slidably provided inside the output shaft 1 for driving the clutch 101 to actively disengage from the bevel gear 2. Preferably, the outer wall body of the driving rod 3 is slidably fitted with the inner wall of the output shaft 1; specifically, a plurality of driving pins 301 are evenly arranged around the circumference of the outer wall in the middle part of the driving rod 3. In the present embodiment, four driving pins 301 are arranged as an example, one end of the driving pin 301 is fixed on the driving rod 3, and the other end extends away from the axis of the driving rod 3 and is placed on the wall of the clutch 101. The clutch 101 is provided with a first sliding groove 104 that cooperates with the driving pin 301.

[0041] The outer wall of the output shaft 1 is provided with a second slide groove 105 for the driving pin 301 to pass through and move up and down. The first slide groove 104 and the second slide groove 105 are both long grooves arranged axially; when the clutch 101 and the bevel gear 2 are in a meshing state, the driving pin 301 passes through the second slide groove 105 and is close to the upper part of the lower end of the first slide groove 104 or contacts the lower end wall of the first slide groove 104. Then, the driving rod 3 can be pushed down by external force, so that the driving pin 301 and the clutch 101 can be driven to slide down through the top contact of the wall of the first slide groove 104 and overcome the elastic force of the clutch spring 102, thereby realizing the forced disengagement of the clutch 101 and the bevel gear 2.

[0042] A plurality of ejector pins 103 cooperating with the clamping plate 4 are slidably provided on the wall at one end of the output shaft 1 where the cutting disc is installed. The ejector pins 103 are evenly arranged in the circumference, and their sliding direction radially slides along the axis of the output shaft 1 away from or close to the axis. The number of the ejector pins 103 can be adaptively adjusted according to the outer diameter of the clamping plate 4. In this embodiment, four ejector pins are set as an example. Specifically, one end of the ejector pin 103 is located in the hollow hole of the output shaft 1, and a limiting boss is provided on the end placed in the ejector pin 103. A sliding hole cooperating with the ejector pin 103 is provided on the wall of the output shaft 1, so that the ejector pin 103 can slide radially relative to the output shaft 1.

[0043] like Figure 2-Figure 4 As shown, the driving rod 3 is provided with a driving inclined surface 302 which contacts the ejector pin 103. The number of the driving inclined surfaces 302 is the same as the number of the ejector pins 103. The driving inclined surfaces 302 extend and tilt outward from top to bottom toward a side away from the axis of the driving rod 3. When the driving rod 3 slides upward, the ejector pin 103 slides outward toward a side away from the axis of the output shaft 1 under the drive of the driving inclined surface 302.

[0044] The end of the output shaft 1 is compressed by the compression piece 4 after the cutting piece is installed. The compression piece 4 is provided with a tapered hole 401 that contacts the ejector pin 103. Figure 2 As shown, the tapered hole 401 is inclined radially outward from top to bottom, so after the driving rod 3 slides upward, the ejector pin 103 slides outward and contacts the tapered hole 401, so that the clamping plate 4 slides and clamps toward the cutting plate, thereby fixing the cutting plate at the shaft end of the output shaft 1.

[0045] In order to unlock the cutting disc when replacing, the driving rod 3 is provided with a reset surface 303 connected with the driving inclined surface 302. The reset surface 303 is arranged above the driving inclined surface 302 and is a vertical plane. The reset surface 303 is provided with a magnetic material for adsorbing the sliding of the ejector pin 103. Preferably, the driving rod body of the reset surface 303 and the driving inclined surface 302 can be made of magnetic material, and the ejector pin 103 is an iron pin body, specifically ferromagnetic. Therefore, after the driving rod 3 slides downward, the reset surface 303 can attract the ejector pin 103 to the reset surface by magnetic attraction, so that the end of the ejector pin 103 away from the output shaft 1 is hidden in the output shaft 1, or is flush with the outer wall of the output shaft 1, so that the cutting disc and the clamping plate 4 can be smoothly slid and disassembled at the end of the output shaft 1.

[0046] like Figure 2 and Figure 4As shown, the upper end of the driving rod 3 is penetrated by the shell and then sleeved with a driving unit, and the driving unit is used to realize the downward sliding of the driving rod 3. Specifically, the driving unit includes a pressure plate 501 sleeved on the driving rod 3, and the driving rod 3 is provided with a rotating groove 508 that matches the pressure plate 501, that is, the upper end of the driving rod 3 can be rotated relative to the pressure plate 501 through the rotating groove 508; a pressure block 502 is slidably provided on the shell, and one end of the pressure plate 501 is rotatably sleeved on the driving rod 3, and the other end is connected to the pressure plate 501.

[0047] The shell is provided with a guide hole 503 for the pressing block 502 to slide; the shell is rotatably provided with an adjusting screw 504 that cooperates with the thread of the pressing block 502; the lower end of the adjusting screw 504 is rotatably connected to the shell, and the upper end is placed above the pressing block 502 and is arranged on a handwheel. When the adjusting screw 504 is rotated clockwise by the handwheel, the thread of the adjusting screw 504 cooperates with the screw hole of the pressing block 502 to make the pressing block 502 slide vertically downward along the guide hole 503, so that the pressing block 502 drives the driving rod 3 to slide vertically downward through the pressing plate 501, thereby realizing the vertical sliding of the driving rod 3. Conversely, when the handwheel is rotated counterclockwise, the driving rod 3 slides vertically upward.

[0048] A use process of a high-efficiency brushless angle grinder, the process is as follows:

[0049] S1: When installing the cutting disc, turn the hand wheel on the adjusting screw 504 clockwise, so that the pressure block 502 drives the pressure plate 501 to slide down vertically, and the driving rod 3 slides down vertically toward the end of the output shaft 1, and the driving pin 301 drives the clutch 101 to slide and disengage the clutch 101 from the bevel gear 2;

[0050] S2: In S1, while the driving rod 3 slides downward, its lower end absorbs the ejector pin 103 through the reset surface 303, so that the ejector pin 103 slides toward the axis of the output shaft 1, and the outer end surface of the ejector pin 103 is hidden in the output shaft 1, and then the cutting disc and the pressing disc 4 are sequentially installed from the shaft end of the output shaft 1;

[0051] S3: After the cutting disc is installed, the hand wheel is turned counterclockwise to make the driving rod 3 slide upward through the upward sliding of the pressure block 502 and the elastic reset of the clutch spring 102. The driving inclined surface 302 at the lower end of the driving rod 3 contacts the ejector pin 103. After receiving the contact force, the ejector pin 103 slides away from the axis of the output shaft 1 and contacts the wall of the tapered hole 401, thereby locking the clamping disc 4. At the same time, the clutch 101 re-engages with the bevel gear 2 to realize power transmission.

[0052] Example 2: See Figure 6-Figure 8 .

[0053] The difference between this embodiment and embodiment 1 lies in the different structure for driving the pressure block 502 to press down, and the rest are the same. Specifically, a swing arm 505 for driving the pressure block 502 to slide is rotatably provided on the shell, and the pressure block 502 is guided and slidably arranged in the guide hole 503, and a return spring 506 is provided between the lower end surface of the pressure block 502 and the bottom of the guide hole 503, that is, the two ends of the return spring 506 are against the pressure block 502 and the bottom of the guide hole 503.

[0054] The swing arm 505 is provided with a pressing block 507 which is rotated to abut against the pressing block 502. One end of the swing arm 505 which cooperates with the housing is in a fork shape, and the forks on both sides are rotatably arranged on the hole walls on both sides of the guide hole 503, and the other end is provided with a handle for the operator to hold. The pressing block 507 is arranged between the fork and the handle. Figure 6 As shown, initially, the handle is placed on the left side of the pressing block 502 , and the pressing block 507 is placed on the upper end surface of the swing arm 505 .

[0055] When the cutting blade needs to be removed or replaced, that is, the driving rod 3 needs to be slid vertically downward, the operator holds the handle and moves it along the Figure 6 The pressing block 507 is swung clockwise in the direction shown, so that the pressing block 507 is pressed against the pressing block 502, pressing the pressing block 502 downward. At this time, the pressing block 502 compresses the return spring 506, and at the same time drives the pressing plate 501 to slide downward, causing the driving rod 3 to slide vertically;

[0056] When the driving rod 3 slides downward, its lower end absorbs the ejector pin 103 through the reset surface 303, so that the ejector pin 103 slides toward the axis of the output shaft 1, and the outer end surface of the ejector pin 103 is hidden in the output shaft 1, and then the cutting disc and the pressing disc 4 are sequentially installed from the shaft end of the output shaft 1;

[0057] After the cutting disc is installed, the handle is swung counterclockwise, and the pressure block 502 is reset under the action of the reset spring 506. The clutch 101 and the drive rod 3 slide upward and reset under the joint action of the clutch spring 102 and the reset spring 506. The driving inclined surface 302 at the lower end of the drive rod 3 contacts the ejector pin 103. After the ejector pin 103 is subjected to the contact force, it slides away from the axis of the output shaft 1 and contacts the wall of the tapered hole 401, thereby locking the pressure disc 4. At the same time, the clutch 101 is re-engaged with the bevel gear 2 to realize power transmission.

[0058] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-efficiency brushless angle grinder, comprising a housing, an output shaft (1) rotatably disposed in the housing, and a bevel gear (2) cooperating with a brushless motor and rotatably disposed on the output shaft (1), characterized in that: A clutch (101) meshing with the bevel gear (2) is slidably provided on the output shaft (1), and a clutch spring (102) is provided between the clutch (101) and the housing; A driving rod (3) is slidably provided in the output shaft (1) for driving the clutch (101) to disengage from the bevel gear (2); the driving rod (3) is provided with a plurality of driving pins (301) that cooperate with the clutch (101); A plurality of ejector pins (103) that cooperate with the clamping sheet (4) are slidably provided at the end of the output shaft (1), and a tapered hole (401) that contacts the ejector pins (103) is provided on the clamping sheet (4); The driving rod (3) is provided with a driving inclined surface (302) that contacts the ejector pin (103); after the driving inclined surface (302) contacts one end of the ejector pin (103), the other end of the ejector pin (103) contacts the tapered hole (401), thereby locking the clamping sheet (4), so that the clamping sheet (4) presses the cutting sheet.

2. A high-efficiency brushless angle grinder according to claim 1, characterized in that: The clutch (101) is provided with a first slide groove (104) that matches the driving pin (301); one end of the driving pin (301) is fixed to the driving rod (3), and the other end is placed in the first slide groove (104).

3. A high-efficiency brushless angle grinder according to claim 2, characterized in that: The output shaft (1) is provided with a second sliding groove (105) for the driving pin (301) to move.

4. The high-efficiency brushless angle grinder according to claim 1, characterized in that: The bevel gear (2) is provided with a first tooth portion (201), and the clutch (101) is provided with a second tooth portion (202) meshing with the first tooth portion (201).

5. A high-efficiency brushless angle grinder according to any one of claims 1 to 4, characterized in that: The driving rod (3) is provided with a reset surface (303) connected to the driving inclined surface (302), and the reset surface (303) is provided with a magnetic material for adsorbing the ejector pin (103) to slide.

6. The high-efficiency brushless angle grinder according to claim 1, characterized in that: The upper end of the driving rod (3) is penetrated by a shell and then sleeved with a driving unit, the driving unit comprising a pressing plate (501) sleeved on the driving rod (3), a pressing block (502) being slidably provided on the shell, one end of the pressing plate (501) being rotatably sleeved on the driving rod (3), and the other end being connected to the pressing plate (501); The housing is provided with a guide hole (503) for the pressing block (502) to slide.

7. A high-efficiency brushless angle grinder according to claim 6, characterized in that: An adjusting screw (504) is rotatably provided on the housing and is threadably matched with the pressing block (502). The adjusting screw (504) rotates so that the pressing block (502) drives the driving rod (3) to slide upward or downward.

8. The high-efficiency brushless angle grinder according to claim 6, characterized in that: A swing arm (505) is rotatably provided on the shell and is used to drive the pressing block (502) to slide. A return spring (506) is provided between the pressing block (502) and the shell. A pressing block (507) is provided on the swing arm (505) and abuts against the pressing block (502) after rotation.

9. The high-efficiency brushless angle grinder according to claim 6, characterized in that: The driving rod (3) is provided with a rotation groove (508) that matches the pressing plate (501).

10. The process for using a high-efficiency brushless angle grinder according to claim 5, characterized in that: The process is as follows: S1: When installing the cutting disc, the driving rod (3) is pushed toward the shaft end of the output shaft (1), and the driving pin (301) drives the clutch (101) to slide, so that the clutch (101) is disengaged from the bevel gear (2); S2: After the driving rod (3) slides, the reset surface (303) absorbs the ejector pin (103), causing the ejector pin (103) to slide toward the axis of the output shaft (1), and then the cutting disc and the pressing disc (4) are sequentially installed from the shaft end of the output shaft (1); S3: After the cutting disc is installed, the driving rod (3) is reset and slid by the elastic force of the clutch spring (102), so that the driving inclined surface (302) contacts the ejector pin (103). After receiving the contact force, the ejector pin (103) slides and contacts the tapered hole (401), thereby locking the clamping disc (4). At the same time, the clutch (101) is re-engaged with the bevel gear (2) to achieve power transmission.

Images