Hand-held angle iron polisher

Abstract

The application discloses a handheld angle steel polisher and relates to the technical field of angle grinders, which comprises a shell, grinding discs symmetrically installed on the shell and a switching mechanism, wherein the switching mechanism comprises an output shaft movably assembled in the head shell, a telescopic sleeve sleeved on the outer side of the output shaft, a switching switch slidably assembled on the head shell, a sliding table symmetrically slidably assembled on the head shell and a threaded connecting sleeve movably arranged on the sliding table and connected with the output shaft through a key groove. The polisher is provided with double grinding discs, the grinding discs at the working position can be quickly switched through the switching mechanism after being overheated, and long-time continuous working is ensured. The polisher is provided with a heat dissipation mechanism for dissipating heat of the grinding discs at the working position and the shutdown position. The polisher is provided with an airflow pipe with a smaller cross section than the handle shell, airflow velocity is accelerated, and the airflow more fully contacts the grinding discs, so that the heat dissipation effect of the airflow is improved. The polisher is provided with a baffle which is adjusted along with the switching mechanism, airflow in the airflow pipe is blown out from the position of the grinding discs at all times, and concentrated airflow improves the heat dissipation efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of angle grinders, in particular to a handheld angle steel grinder. Background Art

[0002] A large amount of angle steel is used in the manufacturing of power towers, and angle grinders are therefore widely used to grind these steels. Grinding angle steel with an angle grinder generates frictional heat. If operated continuously for too long, the grinding disc can overheat, potentially damaging the equipment or posing a safety hazard to the operator. Therefore, the machine must be stopped after a period of grinding to allow the disc to cool before continuing, or the disc can be replaced.

[0003] However, the natural cooling time of the grinding disc is long, and the grinding disc is usually fastened to the angle grinder with a locking nut. When replacing the grinding disc, corresponding tools need to be used for disassembly and assembly, which is quite time-consuming. Therefore, the existing technology arranges a fan in the casing of the angle grinder, opens an air inlet at the rear of the casing, and opens an air outlet at the head shell. The fan introduces air from the rear air inlet, takes away the heat of the motor, and finally blows it out from the air outlet at the head shell to dissipate the heat of the grinding disc. However, the heat dissipation speed of simple air cooling is not as fast as the heating speed of the grinding disc, and can only prolong the processing time of the grinding disc. When the grinding disc is overheated, it still needs to be shut down for cooling. Summary of the Invention

[0004] The object of the present invention is to provide a handheld angle steel grinder to solve the problem in the above-mentioned background art that the grinding disc of the existing angle grinder overheats and needs to be stopped for cooling, which affects the processing efficiency.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides a handheld angle steel grinder, comprising: a housing and two grinding discs respectively mounted on both sides of the housing, and a switching mechanism, wherein:

[0007] The outer shell forms a handle shell for a user to hold and a head shell for mounting the grinding disc, and the outer shell is formed with an air flow inlet and an air flow outlet;

[0008] The switching mechanism includes an output shaft, a telescopic sleeve, a switching switch, a slide and a threaded connection sleeve. The output shaft is movably assembled in the head shell, and the output shaft can rotate axially to drive the grinding disc to rotate. The telescopic sleeve is sleeved on the outside of the output shaft, and the telescopic sleeve can drive the output shaft to retract into the head shell. The switching switch is slidably assembled on the head shell, and the switching switch can drive the telescopic sleeve to retract. The slide is symmetrically slidably arranged on the head shell, and the threaded connection sleeve is movably arranged on the slide and connected to the output shaft through a keyway.

[0009] Furthermore, it also includes a mounting mechanism, a heat dissipation mechanism and a brushless motor, the brushless motor is provided with or connected to a motor shaft, the mounting mechanism includes a protective shell, a connecting flange and a locking nut, the heat dissipation mechanism includes a fan, an air flow duct and a baffle, the fan is connected to the motor shaft to be driven to rotate by the motor shaft, the air flow inlet and the air flow outlet are respectively provided on both sides of the fan, the air flow duct is provided in the head shell for guiding the direction of the air flow, the air flow outlet includes a first air outlet symmetrically opened on the air flow duct, the baffle is movably assembled between the air flow duct and the head shell, a second air outlet is symmetrically opened on the baffle, and the baffle can slide to connect or block the first air outlet.

[0010] Furthermore, a transmission assembly is provided in the outer shell to realize transmission between the motor shaft and the output shaft. The transmission assembly includes a driving bevel gear and two driven bevel gears symmetrically arranged on both sides of the driving bevel gear. The motor shaft passes through the air flow duct and extends to the inside of the head shell. The driving bevel gear is fixedly installed at one end of the motor shaft located on the inside of the head shell.

[0011] Furthermore, two connecting frames for assembling the driven bevel gear are symmetrically provided in the head shell, one end of the output shaft extends to the outside of the head shell, and the other end is connected to the keyway of the driven bevel gear.

[0012] Furthermore, a compression spring is provided between the telescopic sleeve and the connecting frame.

[0013] Furthermore, a connecting rod is provided on the side wall of the telescopic sleeve, and a first shifting rod adapted to the connecting rod is provided on the switching switch.

[0014] Furthermore, the connecting flange includes a mounting frame and a flange body, and the mounting frame and the flange body are connected via a first bearing.

[0015] Furthermore, a third air outlet is symmetrically provided on the side wall of the head shell.

[0016] Furthermore, the two slides are connected by a belt, and two guide rollers for guiding the belt are symmetrically provided in the head shell.

[0017] Compared with the existing technology, one or more of the above technical solutions have the following beneficial effects:

[0018] The present invention provides a handheld angle steel grinder:

[0019] 1. This application adopts a dual grinding head setting, which operates in sequence. When the grinding disc in the working position is overheated, the grinding disc is quickly switched through the switching mechanism, and the overheated grinding disc is switched to the standby position for cooling. At the same time, the grinding disc in the other standby position is switched to the working position for processing, ensuring long-term endurance.

[0020] Second, the present application sets a fan in the handle housing to rotate with the motor shaft, generating airflow from the handle housing to the head housing, dissipating heat to the circuit board assembly and brushless motor in the handle housing, and then blowing out from the head housing to dissipate heat to the grinding discs in the working position and the standby position. On the one hand, it slows down the temperature rise of the grinding disc in the working position and prolongs its working time, and on the other hand, it quickly cools the grinding disc in the standby position, so that the grinding disc in the standby position cools down quickly, eliminating the downtime and cooling time after the grinding disc overheats;

[0021] Third, the present application provides an airflow duct with a smaller cross-sectional area than the handle housing in the head shell, so that the airflow from the handle housing enters the airflow duct and flows faster, so that the airflow can more fully contact the grinding disc when it flows out from the first air outlet, thereby improving the heat dissipation effect of the airflow;

[0022] 4. This application sets a baffle between the head shell and the air flow duct. The baffle is adjusted with the switching mechanism so that the air flow in the air flow duct is always blown out from the position where the grinding disc is located, concentrating the air flow to improve the heat dissipation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0024] Figure 1 A schematic structural diagram of the angle grinder provided by the present invention;

[0025] Figure 2 A schematic cross-sectional view of the angle grinder provided by the present invention;

[0026] Figure 3 A schematic diagram of a partially exploded structure of the angle grinder provided by the present invention;

[0027] Figure 4 Another cross-sectional structural diagram of the angle grinder provided by the present invention;

[0028] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0029] Figure 6 Another schematic cross-sectional view of the angle grinder provided by the present invention;

[0030] Figure 7 for Figure 6 Enlarged view of point B in the middle;

[0031] Figure 8 A schematic diagram of the cross-sectional structure of the head shell provided by the present invention;

[0032] Figure 9 for Figure 8 Enlarged view of point C in the middle.

[0033] In the picture:

[0034] 100, shell;

[0035] 110. Head shell; 111. Third air outlet; 112. First chute; 113. Second chute; 120. Grip housing; 121. Brushless motor; 122. Battery; 123. Air inlet; 124. Power switch; 125. Motor shaft; 126. Driving bevel gear; 127. Driven bevel gear; 128. Connecting frame; 129. Output shaft; 130. Telescopic sleeve; 131. Compression spring; 132. Connecting rod.

[0036] 200, installation mechanism;

[0037] 210, protective shell; 220, connecting flange; 221, mounting bracket; 222, first bearing; 223, flange body; 224, nut; 230, grinding disc; 240, locking nut;

[0038] 300, heat dissipation mechanism;

[0039] 310, fan; 320, air flow duct; 321, first air outlet; 330, baffle; 331, second air outlet; 332, second lever;

[0040] 400, switching mechanism;

[0041] 410, slide; 411, threaded connection sleeve; 412, belt; 413, guide roller; 414, shift block; 420, switching switch. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0043] See also Figures 1 to 9 The present invention provides a handheld angle steel grinder, comprising: a housing 100, a mounting mechanism 200, a switching mechanism 400, a heat dissipation mechanism 300, a battery 122, a power switch 124, a circuit board assembly (not shown) and a brushless motor 121;

[0044] like Figures 1 to 2As shown, the outer shell 100 forms a handle shell 120 for the user to hold in hand and a head shell 110 for assembling a grinding disc 230, with a grinding disc 230 installed on each side of the head shell 110; an internal space that matches its shape is formed inside the handle shell 120, which is used to install a circuit board group, a brushless motor 121 and a heat dissipation mechanism 300, and a battery 122 is replaceably installed at the rear end of the handle shell 120.

[0045] like Figure 2 As shown, the brushless motor 121 is installed in the handle housing 120 and is provided with or connected to a motor shaft 125 . The brushless motor 121 is powered by a battery 122 to drive the motor shaft 125 to rotate, and is started and stopped by a power switch 124 .

[0046] like Figure 2 、 Figure 8 and Figure 9 As shown, the switching mechanism 400 is used to switch the working grinding disc 230 to the standby position when it overheats, and switch the grinding disc 230 in the standby position on the other side of the head shell 110 to the working position, thereby shortening the standby cooling time caused by the overheating of the grinding disc 230. The switching mechanism 400 includes an output shaft 129, a transmission assembly, a telescopic sleeve 130, and a switching switch 420.

[0047] like Figure 2 、 Figure 4 and Figure 7 As shown, the transmission assembly is arranged between the brushless motor 121 and the output shaft 129, and is used for transmitting between the motor shaft 125 and the output shaft 129. The output shaft 129 is used to drive the connecting flange 220 and the locking nut 240 to rotate. The output shaft 129 is substantially perpendicular to the motor shaft 125. The transmission assembly may include: a driving bevel gear 126 and a driven bevel gear 127. The driving bevel gear 126 is meshed with the driven bevel gear. One end of the motor shaft 125 passes through and extends to the interior of the head shell 110 and is fixedly installed with The driving bevel gear 126 can rotate synchronously with the motor shaft 125. One end of the output shaft 129 passes through and extends to the outside of the head shell 110, and the other end is connected to the driven bevel gear 127 through a keyway. The driven bevel gear 127 can rotate synchronously with the output shaft 129. Therefore, when the motor shaft 125 rotates, it drives the driving bevel gear 126 to rotate, the driving bevel gear 126 drives the driven bevel gear 127 to rotate, and the driven bevel gear 127 drives the output shaft 129 to rotate synchronously, thereby realizing transmission.

[0048] like Figure 5 and Figure 7As shown, the telescopic sleeve 130 is sleeved on the outside of the output shaft 129 to drive the output shaft 129 to retract into the head shell 110. A connecting rod 132 is provided on the side wall of the telescopic sleeve 130. The switching switch 420 is slidably assembled on the head shell 110 to drive the telescopic sleeve 130 to retract. A second sliding groove 113 adapted to the switching switch 420 is opened on the side wall of the head shell 110. The switching switch 420 is provided with a first lever adapted to the connecting rod 132. The first lever is V-shaped, and its opening faces the connecting rod. 132. Before moving the switching switch 420, the largest end of the first lever opening contacts the connecting rod 132. When the switching switch 420 is driven to slide along the second sliding groove 113 toward the connecting rod 132, the first lever drives the connecting rod 132 to move toward the middle, driving the telescopic sleeve 130 to move toward each other, and then driving the output shaft 129 to slide into the inner side of the head shell 110 to make way, so that the output shaft 129 is disengaged from the threaded connecting sleeve 411. At this time, the protective shell 210 can be moved to switch the grinding disc 230.

[0049] like Figure 3 As shown, the side walls on the opposite sides of the head shell 110 are provided with a first slide groove 112 adapted to the slide 410, and the slide 410 is slidably assembled in the first slide groove 112. The end face of the slide 410 located on the outer side of the head shell 110 is provided with a number of positioning studs for assembling the protective shell 210 and the connecting flange 220.

[0050] like Figure 3 and Figure 5 As shown, the threaded sleeve 411 is axially rotatably installed on the slide 410, the threaded sleeve 411 is parallel to the axis of the output shaft 129, and the threaded sleeve 411 and the output shaft 129 are connected and matched through a keyway, one end of the threaded sleeve 411 extends to the outside of the slide 410, and a thread is provided on the side wall at one end of the outside of the slide 410 for assembling the grinding disc 230 and the locking nut 240.

[0051] like Figure 3 As shown, the mounting mechanism 200 is used to clamp the grinding disc 230. The mounting mechanism 200 includes a protective shell 210, a connecting flange 220 and a locking nut 240. The connecting flange 220 includes a mounting frame 221 and a flange body 223. The mounting frame 221 and the flange body 223 are connected by a first bearing 222. Both the protective shell 210 and the mounting frame 221 are provided with through holes that are compatible with the positioning studs of the slide 410. When installing the grinding disc 230, first, the mounting frame 221 and the protective shell 210 are threadedly connected and fixed to the slide 410 through the nut 224 and the positioning studs, and then the grinding disc 230 is installed on the threaded connection sleeve 411. Finally, the locking nut 240 is screwed onto the threaded connection sleeve 411 by a tool to fix the grinding disc 230 between the flange body 223 and the locking nut 240.

[0052] like Figure 2 and Figure 9 As shown, the heat dissipation mechanism 300 is disposed in the housing 100 for dissipating heat from the grinding disc 230 , the circuit board assembly and the brushless motor 121 . The heat dissipation mechanism 300 includes a fan 310 , an airflow duct 320 and a baffle 330 .

[0053] like Figure 2 As shown, the fan 310 is installed on the motor shaft 125 and is driven to rotate by the motor shaft 125. When the brushless motor 121 drives the motor shaft 125 to rotate, the motor shaft 125 drives the fan 310 to rotate, forming an airflow from the outside of the outer shell 100 to the inside of the outer shell 100 and then flowing out to the outside of the outer shell 100. In order to form the airflow, an airflow inlet 123 is opened on the handle shell 120, and an airflow outlet is opened on the head shell 110, so that the airflow inlet 123 and the airflow outlet are respectively located on both sides of the fan 310. Therefore, when the fan 310 rotates, air enters the inside of the handle shell 120 from the airflow inlet 123, passes through the battery 122, the circuit board assembly and the brushless motor 121, and then flows toward the head shell 110, and is then blown out from the head shell 110 to the grinding disc 230.

[0054] like Figure 2 、 Figure 8 and Figure 9 As shown, the airflow duct 320 is installed in the head shell 110, and the airflow outlet includes a first air outlet 321 symmetrically opened on the side wall of the airflow duct 320, and a third air outlet 111 symmetrically opened on the side wall of the head shell 110. The first air outlet 321 corresponds to the third air outlet 111 one by one. The airflow duct 320 is used to guide the airflow blown from the grip shell 120 to the position of the first air outlet 321, and the pipe mouth cross-sectional area of ​​the airflow duct 320 is smaller than the grip shell 120, so that the airflow from the grip shell 120 After the flow rate of the airflow is accelerated, the airflow can be more fully in contact with the grinding disc 230 when flowing out from the first air outlet 321, thereby improving the heat dissipation effect of the airflow.

[0055] like Figures 8 and 9As shown, the baffle 330 is movably installed between the airflow duct 320 and the head shell 110, and is used to connect or block the first air outlet 321 and the third air outlet 111. The airflow outlet also includes a second air outlet 331 symmetrically opened on the baffle 330, and a second lever 332 is symmetrically installed on the side wall of the baffle 330 facing the slide 410. A lever block 414 adapted to the second lever 332 is installed on the side wall of the slide 410 located on the inner side of the head shell 110. During the switching of the grinding disc 230, the slide 410 in the working position moves along the first slide groove 112 to the standby position. When it is about to move to the standby position, it touches and pushes the second lever 332 to move synchronously, thereby driving the baffle 330 to move, so that the second air outlet 331 on the baffle 330 near the standby position is aligned with the first air outlet 321 and the third air outlet 111 at the standby position, and the baffle 330 away from the standby position. The second air outlet 331 on one side is staggered with the first air outlet 321 and the third air outlet 111 at the working position, so that the baffle 330 closes the first air outlet 321 at the working position, and the airflow in the airflow duct 320 can only be blown out through the standby position to dissipate heat to the grinding disc 230 on standby cooling; similarly, the grinding disc 230 at the standby position on the other side drives the baffle 330 to move during the movement to the working position, so that the second air outlet 331 on the side close to the working position is aligned with the first air outlet 321 and the third air outlet 111 at the working position, and the first air outlet 321 at the standby position is closed, so that the airflow in the airflow duct 320 is blown out from the working position to dissipate heat to the grinding disc 230 in operation.

[0056] like Figure 4 and Figure 7 As shown, two connecting frames 128 for assembling the driven bevel gear 127 are symmetrically installed in the head shell 110, and the connecting frames 128 are connected to the driven bevel gear 127 through a second bearing (not shown).

[0057] like Figure 5 and Figure 7 As shown, a compression spring 131 is provided between the telescopic sleeve 130 and the connecting frame 128. The compression spring 131 applies a force to the telescopic sleeve 130 away from the driven bevel gear 127, so that the telescopic sleeve 130 drives the output shaft 129 to extend to the outside of the head shell 110. When switching the grinding disc 230, the sliding switch 420 is used to drive the two telescopic sleeves 130 to move toward each other, so that the output shaft 129 is disengaged from the threaded connection sleeve 411. At this time, the compression spring 131 is in a compressed state. When the grinding disc 230 is switched into place, the switch 420 is released, the compression spring 131 is released, driving the telescopic sleeve 130 away from each other, driving the output shaft 129 to move toward the outside of the head shell 110, and then rotating the grinding disc 230 in the working position so that the output shaft 129 is key-connected with the threaded connection sleeve 411 at this position.

[0058] like Figures 4 and 5 As shown, the two slides 410 are connected by a belt 412, and two guide rollers 413 for guiding the belt 412 are symmetrically provided in the head shell 110. The guide rollers 413 are used to reduce the friction force exerted on the belt 412 at the corners. During the switching of the grinding disc 230, the output shaft 129 is disengaged from the threaded connection sleeve 411 by switching the switch 420, and the grinding disc 230 located in the standby position is moved along the first slide groove 112 to the working position. During the movement, the grinding disc 230 located in the working position on the other side is driven by the belt 412 to move along the first slide groove 112 to the standby position.

[0059] Working principle: When the grinding disc 230 at the working position is overheated, the power switch 124 is turned off, and the switch 420 is pushed along the second slide groove 113. The two connecting rods 132 are driven to move closer together through the first lever, and the two telescopic sleeves 130 are driven to move closer together, and then the two output shafts 129 are driven to disengage from the threaded connection sleeve 411 and slide into the head shell 110, so that the protective shell 210 of the grinding disc 230 at the standby position can be moved to drive the slide 410 to move along the first slide groove 112 to the working position. The shift block 414 on the baffle 330 touches the second shift rod 332 on the baffle 330, driving the baffle 330 to move synchronously, so that the second air outlet 331 on the baffle 330 near the working position is aligned with the first air outlet 321 and the third air outlet 111 at the working position, so that these are connected, and the second air outlet 331 on the baffle 330 near the standby position is staggered with the first air outlet 321 and the third air outlet 111 at the standby position, so that these are closed; at the same time, the slide 410 on the other side at the working position Under the traction of the belt 412, it moves synchronously to the standby position and drives the baffle 330 to move to the standby position, so that the second air outlet 331 on the baffle 330 near the standby position is aligned with the first air outlet 321 and the third air outlet 111 at the standby position, so that this place is connected, and the second air outlet 331 on the baffle 330 near the working position is staggered with the first air outlet 321 and the third air outlet 111 at the working position, so that this place is closed; after the switching is completed, the power switch 124 is turned on, and the battery 1 22 supplies power to the brushless motor 121, driving the motor shaft 125 to rotate, and the motor shaft 125 drives the fan 310 to rotate, causing the airflow to enter the interior of the grip shell 120 from the airflow inlet 123 at the end of the grip shell 120, flow through the battery 122, the circuit board assembly and the brushless motor 121 to take away the heat, and then flow toward the head shell 110. After entering the airflow duct 320, the airflow is accelerated and blown out from the airflow outlets corresponding to the two grinding discs 230 to dissipate heat for the working grinding disc 230 and the grinding disc 230 on standby for cooling.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the scope of protection of the present invention.

Claims

1. A handheld angle steel grinder, characterized by: include: A housing (100), a mounting mechanism (200), a switching mechanism (400), a heat dissipation mechanism (300), a power switch (124), a circuit board assembly, and a brushless motor (121); The housing (100) forms a grip housing (120) for a user to hold in hand and a head housing (110) for assembling a grinding disc (230), with a grinding disc (230) mounted on each side of the head housing (110). An internal space conforming to the shape of the grip housing (120) is formed inside the grip housing (120) for mounting a circuit board assembly, a brushless motor (121), and a heat dissipation mechanism (300). A battery (122) is replaceably mounted at the rear end of the grip housing (120). The housing (100) is formed with an airflow inlet (123) and an airflow outlet. The switching mechanism (400) includes an output shaft (129), a telescopic sleeve (130), a switching switch (420), a slide (410) and a threaded connection sleeve (411), wherein the output shaft (129) is movably assembled in the head shell (110), the output shaft (129) can rotate axially to drive the grinding plate (230) to rotate, the telescopic sleeve (130) is sleeved on the outside of the output shaft (129), the telescopic sleeve (130) can drive the output shaft (129) to retract into the head shell (110), the switching switch (420) is slidably assembled on the head shell (110), the switching switch (420) can drive the telescopic sleeve (130) to retract, the slide (410) is symmetrically slidably arranged on the head shell (110), and the threaded connection sleeve (411) is movably arranged on the slide (410) and connected to the output shaft (129) through a keyway; Two connecting frames (128) for assembling the driven bevel gear (127) are symmetrically provided in the head shell (110); one end of the output shaft (129) extends to the outside of the head shell (110), and the other end is connected to the keyway of the driven bevel gear (127); a compression spring (131) is provided between the telescopic sleeve (130) and the connecting frame (128); a connecting rod (132) is provided on the side wall of the telescopic sleeve (130); and a first shifting rod adapted to the connecting rod (132) is provided on the switching switch (420); the first shifting rod is V-shaped, and its opening faces the connecting rod (132); The two slides (410) are connected via a belt (412), and two guide rollers (413) for guiding the belt (412) are symmetrically provided in the head shell (110).

2. The handheld angle steel grinder according to claim 1, characterized in that: The brushless motor (121) is provided with or connected to a motor shaft (125), the mounting mechanism (200) comprises a protective shell (210), a connecting flange (220) and a locking nut (240), the heat dissipation mechanism (300) comprises a fan (310), an airflow duct (320) and a baffle (330), the fan (310) being connected to the motor shaft (125) for rotation, the airflow inlet (123) and the airflow outlet being respectively provided on both sides of the fan (310), the airflow duct (320) being provided in the head shell (110) for guiding the direction of the airflow, the airflow outlet comprising a first air outlet (321) symmetrically provided on the airflow duct (320), the baffle (330) being movably assembled between the airflow duct (320) and the head shell (110), the baffle (330) being symmetrically provided with a second air outlet (331), and the baffle (330) being capable of sliding to connect with or block the first air outlet (321).

3. The handheld angle steel grinder according to claim 2, characterized in that: A transmission assembly for realizing transmission between the motor shaft (125) and the output shaft (129) is provided in the housing (100), the transmission assembly comprising a driving bevel gear (126) and two driven bevel gears (127) symmetrically arranged on both sides of the driving bevel gear (126), the motor shaft (125) passing through the air flow duct (320) and extending to the inside of the head shell (110), and the driving bevel gear (126) is fixedly mounted on one end of the motor shaft (125) located inside the head shell (110).

4. The handheld angle steel grinder according to claim 2, characterized in that: The connecting flange (220) comprises a mounting frame (221) and a flange body (223); the mounting frame (221) and the flange body (223) are connected via a first bearing (222).

5. The handheld angle steel grinder according to claim 1, characterized in that: A third air outlet (111) is symmetrically provided on the side wall of the head shell (110).

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