Portable intelligent alternating-current single-phase brushless angle grinder

Abstract

The invention relates to the technical field of angle grinders, and discloses a portable intelligent alternating-current single-phase brushless angle grinder which comprises a machine head module and a machine body module, the machine body module and the machine head module are detachably installed together, a transmission mechanism and a protection assembly are arranged in the machine head module, the transmission mechanism comprises a rotating shaft and a transmission column, and the transmission column is arranged on the machine head module. Through the arrangement of the clamping assembly, when a friction plate is clamped on a workpiece in the cutting process, huge instantaneous impact force caused by rotation of the friction plate acts on a torsional spring, at the moment, the friction plate is clamped and cannot rotate, but the clamping assembly can continue to rotate; under the combined action of friction force generated when the main clamping block and the auxiliary clamping block clamp the friction plate and elastic tension generated when the torsional spring abuts against the limiting plate, the impact force generated when the friction plate is suddenly clamped is relieved, and therefore the situation that the friction plate is suddenly clamped and consequently fractured and damaged can be avoided, residual piece splashing generated when the friction plate is fractured is avoided, and the service life of the friction plate is prolonged. And the possibility of injury to workers is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of angle grinders, and specifically to a portable intelligent AC single-phase brushless angle grinder. Background Art

[0002] An angle grinder is a handheld power tool mainly used for operations such as cutting, grinding, polishing, and rust removal of hard materials such as metals, stones, and concretes. The working principle of the angle grinder is to drive a grinding wheel or other accessories to rotate at high speed through a built-in motor, and utilize the friction or cutting action between the rotating grinding wheel and the workpiece surface to achieve the processing of the workpiece.

[0003] When the angle grinder is cutting, it often encounters a situation where the workpiece is too hard or the grinding wheel is suddenly clamped, resulting in the grinding wheel being stuck. At the moment of sudden jamming, a great impact force will be generated. When this impact force acts on the stuck grinding wheel, it may be broken, causing the broken fragments to fly out, which may cause injury to the user and is extremely dangerous. Moreover, during the grinding process, if due to environmental restrictions, that is, the user stands at a 90-degree position with the angle grinder, at this time, the protective plate on the angle grinder cannot effectively protect against dust and debris, and a large amount of dust will be scattered near the user, so there will be a greater health and safety hazard. Summary of the Invention

[0004] To solve the above problems existing in the prior art, the present invention provides a portable intelligent AC single-phase brushless angle grinder, which has the advantage of preventing the friction plate from breaking when it is stuck.

[0005] To achieve the above purpose of preventing the friction plate from breaking when it is stuck, the present invention provides the following technical solutions: including a head module and a body module, the body module and the head module are detachably installed together, and a transmission mechanism and a protection component are arranged in the head module; The transmission mechanism includes a rotating shaft and a transmission column, wherein the transmission column and the rotating shaft are connected together through gears, a rotating head is fixed on one side of the rotating shaft, a clamping component is installed on the rotating head, and a friction plate is installed on the clamping component; The clamping component includes a main clamping block and a sub-clamping block. A limiting ring is rotatably connected inside the main clamping block. The limiting ring and the main clamping block are connected together through a torsion spring. A buckle is arranged inside the limiting ring. One end of the torsion spring is fixedly connected to the inner wall of the main clamping block, and the other end is movably installed on the buckle.

[0006] Preferably, a limiting cavity is opened inside the limiting ring, the buckle is hinged inside the limiting cavity, the buckle includes a limiting plate and a limiting convex block, the limiting plate is installed on the two end faces of the limiting cavity through a rotating shaft, and the limiting convex block is fixedly installed on the two end faces of the limiting cavity.

[0007] Preferably, a limit pin is fixed to one end of the torsion spring. The limit pin and the limit plate are buckled together. The torsion spring is installed at the gap between the main clamping block and the limiting ring. The end face of the limiting convex block close to the limit plate is provided with a chamfer, and the other side is provided with an inclined chamfer.

[0008] Preferably, the friction plate is installed between the main clamping block and the auxiliary clamping block. At least two friction plates are arranged inside the friction plate. The friction plate is embedded into the limiting ring. An installation pin is detachably installed on the auxiliary clamping block. The installation pin is also installed on the limiting ring. The auxiliary clamping block and the main clamping block clamp the friction plate. The friction plate is restricted between the main clamping block and the auxiliary clamping block by friction. The main clamping block is fixedly installed on the rotating head, and the auxiliary clamping block is movably installed on the rotating head.

[0009] Preferably, a transmission cavity is formed inside the machine head module. The gear includes a driving bevel gear and a driven bevel gear. The driven bevel gear is fixed on the rotating shaft. The driving bevel gear is fixed on one side of the transmission column. The driving bevel gear and the driven bevel gear are meshed with each other. A square groove is arranged inside the transmission column.

[0010] Preferably, the protection assembly includes a protection rotating ring and a protection plate. The protection rotating ring is rotatably connected to the machine head module. A rotating groove is formed inside the protection rotating ring. A sliding ring is movably connected inside the rotating groove. The protection plate is detachably installed on the sliding ring.

[0011] Preferably, an adjusting spring is fixed on the sliding ring. The adjusting spring is located inside the rotating groove. The adjusting spring abuts against the inner wall of the rotating groove first. A sleeve ring is fixed on the protection plate. The protection plate is located on the outer peripheral side of the friction plate. The sleeve ring abuts against the sliding ring. The middle part of the sleeve ring is disconnected. Two extension blocks are arranged at the disconnected part. Bolts are installed on the extension blocks.

[0012] Preferably, an auxiliary wheel is also rotatably connected inside the machine head module. A driven shaft is fixed on the auxiliary wheel. The auxiliary wheel is matched with the protection rotating ring. The driven shaft extends to the outside first close to one side of the fuselage module.

[0013] Preferably, an adjusting shaft is rotatably connected inside the machine head module. An adjusting gear is fixed at one end of the adjusting shaft, and an end face gear is fixed at the other end. The end face gear is meshed with the end face of the outer part of the driven shaft. An adjusting ring is also rotatably connected to the outer peripheral side of the fuselage module. The adjusting ring is meshed with the adjusting gear.

[0014] Preferably, an auxiliary handle is detachably installed on the head module. A motor is also provided inside the body module, and the motor is electrically connected to an external wire. Heat dissipation holes are provided on the outer peripheral side of the body module.

[0015] Compared with the prior art, the present invention provides a portable intelligent AC single-phase brushless angle grinder, which has the following beneficial effects: 1. In this portable intelligent AC single-phase brushless angle grinder, through the setting of the clamping assembly, when the friction plate gets stuck on the workpiece during the cutting process, the huge instantaneous impact force generated by its rotation acts on the torsion spring. At this time, the friction plate is stuck and cannot rotate, but the clamping assembly can continue to rotate. Under the combined action of the frictional force between the main clamping block and the auxiliary clamping block clamping the friction plate and the elastic tension generated by the torsion spring abutting against the limiting plate, the impact force of the sudden jamming of the friction plate is reduced, thereby avoiding the fracture and damage of the friction plate caused by sudden jamming, and also avoiding the splashing of the fragments generated by the fracture of the friction plate, which may cause injury to the staff. Moreover, by manually rotating the friction plate in the reverse direction, the limiting ring can be driven to rotate in the reverse direction by the friction plate, so that the torsion spring abuts against the limiting plate and resets, which is convenient for repeated use next time.

[0016] 2. In this portable intelligent AC single-phase brushless angle grinder, the whole angle grinder can be divided into two modules, which are independent of each other and can be installed together. The damage of one independent part will not affect the other part. It is only necessary to directly replace the damaged part of the same model, which greatly saves the replacement time. Or if it is necessary to replace other heads, such as the heads for drilling, cutting, end face grinding, etc., the head module can be directly disassembled to replace other heads, forming a set of equipment with the tail of the angle grinder, which greatly saves the production cost. Moreover, its interior is in a sealed state, which can effectively prevent the dust generated by grinding from entering the head module and damaging other electronic components and other parts.

[0017] 3. In this portable intelligent AC single-phase brushless angle grinder, through the setting of the rotatable protection assembly, the position of the protection plate can be manually controlled by the user. During the grinding process, there are a large amount of debris and dust, but the position of the protection plate will be adjusted according to the different positions of the user, so that it is always on the side close to the user, effectively preventing a large amount of dust and debris from affecting the user's vision and physical health. Moreover, since the protection plate can move up and down along with the sliding ring, when grinding the middle part of the workpiece with the friction plate, the angle grinder can be directly pressed down parallelly, and the protection plate moves up, so that the friction plate contacts the surface of the workpiece, and direct surface grinding can be carried out, instead of being restricted by the current protection plate and unable to directly grind the middle part of the workpiece with the friction plate, and it is necessary to replace the end face grinding disc to complete the grinding of the middle part. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2 Schematic diagram of the internal structure of the present invention; Figure 3 For the present invention Figure 2 Enlarged schematic diagram of part A in the present invention; Figure 4 Exploded schematic diagram of the clamping assembly of the present invention; Figure 5 Bottom schematic diagram of the clamping assembly of the present invention; Figure 6 Internal schematic diagram of the clamping assembly of the present invention; Figure 7 Half-section schematic diagram of the clamping assembly of the present invention; Figure 8 For the present invention Figure 7 Enlarged schematic diagram of part B in the present invention;.

[0019] In the figure: 10, head module; 101, transmission column; 102, driving bevel gear; 103, transmission cavity; 104, rotating shaft; 105, driven bevel gear; 106, rotating head; 11, fuselage module; 12, adjusting ring; 121, adjusting shaft; 122, adjusting gear; 123, face gear; 13, auxiliary handle; 20, protective rotating ring; 21, sliding ring; 211, adjusting spring; 22, auxiliary wheel; 221, driven shaft; 30, main clamping block; 301, limiting ring; 3011, limiting cavity; 3012, limiting plate; 3013, limiting convex block; 302, torsion spring; 3021, limiting pin; 31, sub-clamping block; 311, mounting pin; 40, protective plate; 401, collar; 4011, extension block; 4012, bolt; 50, friction plate. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] As Figures 1-8As shown in the figure, it includes a head module 10 and a body module 11. The body module 11 and the head module 10 are detachably installed together. A transmission mechanism and a protection component are arranged in the head module 10. An auxiliary handle 13 is also detachably installed on the head module 10. Through the auxiliary handle 13, the operability of the angle grinder by the user can be increased. A motor is also arranged inside the body module 11. The motor is electrically connected to the external wire. Heat dissipation holes are provided on the outer peripheral side of the body module 11. The end of the motor shaft in the body module 11 is square. One side end face close to the head module 10 can be sealed. The motor shaft extends to the outside, so that the whole angle grinder is divided into two modules, which are independent of each other and can be installed together. When one independent part is damaged, it will not affect the other part. Just directly replace the damaged part of the same model, which greatly saves the replacement time. Or if it is necessary to replace other heads, such as heads for drilling, cutting, end face grinding, etc., the head module 10 can be directly disassembled to replace other heads, forming a set of equipment with the tail of the angle grinder, which greatly saves the production cost; The transmission mechanism includes a rotating shaft 104 and a transmission column 101. The transmission column 101 and the rotating shaft 104 are connected together by gears. A rotating head 106 is fixed on one side of the rotating shaft 104. A transmission cavity 103 is provided inside the head module 10. The gears include a driving bevel gear 102 and a driven bevel gear 105. The driven bevel gear 105 is fixed on the rotating shaft 104. The driving bevel gear 102 is fixed on one side of the transmission column 101. The driving bevel gear 102 meshes with the driven bevel gear 105. A square groove is provided inside the transmission column 101. The square groove of the transmission column 101 cooperates with the motor shaft in the body module 11. The motor shaft can be inserted into the transmission column 101 to drive the transmission mechanism to rotate. Only the transmission column 101 rotates on the side end face of the head module 10 close to the body module 11, and its interior is in a sealed state, which can effectively prevent the dust generated by grinding from entering the head module 10 and damaging other electronic components and other parts.

[0022] A clamping component is installed on the rotating head 106, and a friction plate 50 is installed on the clamping component. The clamping component includes a main clamping block 30 and a sub-clamping block 31. A limiting ring 301 is rotatably connected inside the main clamping block 30. The limiting ring 301 and the main clamping block 30 are connected together by a torsion spring 302. A buckle is provided inside the limiting ring 301. One end of the torsion spring 302 is fixedly connected to the inner wall of the main clamping block 30, and the other end is movably installed on the buckle.

[0023] The friction plate 50 is installed between the main clamping block 30 and the sub-clamping block 31. At least two friction plate 501 are arranged inside the friction plate 50. By embedding the friction plate 501 into the limiting ring 301, it can rotate together with the limiting ring 301. A mounting pin 311 is detachably installed on the sub-clamping block 31, and the mounting pin 311 is also installed on the limiting ring 301, that is, the sub-clamping block 31 is installed on the limiting ring 301, but the sub-clamping block 31 can also press the friction plate 50 against the main clamping block 30. Therefore, the main clamping block 30 on the angle grinder will first rotate to drive the friction plate 50 to rotate through friction. Then when the friction plate 50 starts to grind and cut, the friction force is not enough to drive the friction plate 50 to rotate. At this time, the torsion spring 302 can be tightened, and then the limiting ring 301 is pulled by the torsion spring 302 to drive the friction plate 50 to rotate for cutting and grinding. Then the sub-clamping block 31 and the main clamping block 30 clamp the friction plate 50, and the friction plate 50 is restricted between the main clamping block 30 and the sub-clamping block 31 through friction. The main clamping block 30 is fixedly installed on the rotating head 106, and the sub-clamping block 31 is movably installed on the rotating head 106.

[0024] A limiting cavity 3011 is provided in the limiting ring 301, and the buckle is hinged in the limiting cavity 3011. The buckle includes a limiting plate 3012 and a limiting protrusion 3013. The limiting plate 3012 is installed on the two side end faces of the limiting cavity 3011 through a rotating shaft, and the limiting protrusion 3013 is fixedly installed on the two side end faces of the limiting cavity 3011. The end face of the limiting protrusion 3013 close to the limiting plate 3012 is chamfered, and the other side is chamfered. The material of the limiting protrusion 3013 is soft material, which will only be deformed when subjected to a large force, and the initial state of the limiting plate 3012 is on the chamfered side of the limiting protrusion 3013. When the limiting plate 3012 squeezes the limiting protrusion 3013, it cannot easily cross the limiting protrusion 3013, and needs The chamfered angle is set so that when the limit block 3013 moves from the chamfered angle side to the rounded angle side, the slope of the chamfered angle is lower, so the limit block 3013 can be squeezed and passed over the limit block 3013 more easily and enter the rounded angle side. The initial position of the limit plate 3012 is on the rounded angle side of the limit block 3013, so that the angle between it and the torsion spring 302 is less than 90 degrees, so the torsion spring 302 can be stuck with the limit plate 3012. One end of the torsion spring 302 is fixed with a limit pin 3021, and the limit pin 3021 is buckled with the limit plate 3012. The torsion spring 302 is installed on the main clamping block 30 and the limit When the main clamping block 30 rotates, the torsion spring 302 can be tightened to drive the limiting ring 301 to rotate, so that the friction plate 50 can be driven to rotate at the same time through the pulling of the torsion spring 302 and the friction force between the auxiliary clamping block 31 and the main clamping block 30 clamping the friction plate 50, so that the friction plate 50 can rotate normally for grinding and cutting. When the friction plate 50 is stuck on the workpiece during the cutting process, the huge impact force caused by its rotation acts on the torsion spring 302, causing the torsion spring 302 to pull the limit plate 3012 to rotate, which squeezes the limit protrusion 3013 and passes over the limit protrusion 3013, causing the limit plate 3012 to tilt to the other side. At this time, the angle at which the limit plate 3012 contacts the torsion spring 302 is greater than 90 degrees, so the impact force will Continue to drive the torsion spring 302 to disengage from the abutment limit plate 3012, and then the friction force between the friction plate 50 and the main clamping block 30 and the auxiliary clamping block 31 cannot limit the friction plate 50. At this time, the friction plate 50 is stuck and cannot rotate, but the clamping assembly can continue to rotate. The friction force between the main clamping block 30 and the auxiliary clamping block 31 clamping the friction plate 50 and the elastic tension generated by the abutment between the torsion spring 302 and the limit plate 3012 can reduce the impact force of the sudden jamming of the friction plate 50, thereby avoiding the friction plate from being suddenly jammed and causing damage to the friction plate, and avoiding the possibility of debris generated by the breakage of the friction plate splashing, which may cause injuries to the staff. In addition, by manually rotating the friction plate 50 in the opposite direction, the friction plate 50 can drive the limit ring 301 to rotate in the opposite direction.Press the torsion spring 302 against the limit plate 3012 to reset it, facilitating reuse in the next cycle.

[0025] The protection assembly includes a protection rotating ring 20 and a protection plate 40. The protection rotating ring 20 is rotatably connected to the machine head module 10. A rotating groove is formed inside the protection rotating ring 20, and a sliding ring 21 is movably connected inside the rotating groove. The protection plate 40 is detachably installed on the sliding ring 21. A regulating spring 211 is fixed on the sliding ring 21. The regulating spring 211 is located inside the rotating groove and abuts against the inner wall of the rotating groove. The regulating spring 211 rotates relative to the protection rotating ring 20. A collar 401 is fixed on the protection plate 40. The protection plate 40 is located on the outer periphery of the friction plate 50. The collar 401 abuts against the sliding ring 21. The middle of the collar 401 is discontinuously arranged, and two extension blocks 4011 are arranged at the discontinuous part. Bolts 4012 are installed on the extension blocks 4011. An auxiliary wheel 22 is also rotatably connected inside the machine head module 10. A driven shaft 221 is fixed on the auxiliary wheel 22. The auxiliary wheel 22 cooperates with the protection rotating ring 20, and the two can be in frictional cooperation or gear meshing. The driven shaft 221 extends to the outside first on the side close to the body module 11. A regulating shaft 121 is rotatably connected inside the machine head module 10. A regulating gear 122 is fixed at one end of the regulating shaft 121, and an end face gear 123 is fixed at the other end. The end face gear 123 meshes with the end face of the outside part of the driven shaft 221. Through the segmented setting of the driven shaft 221 and the regulating shaft 121, it matches the modular design of the above angle grinder, facilitating the disassembly of the two. An adjusting ring 12 is also rotatably connected to the outer periphery of the body module 11. The adjusting ring 12 meshes with the regulating gear 122. Through the setting of the rotatable protection assembly, the position of the protection plate 40 can be manually controlled by the user. During the grinding process, there are a large amount of debris and dust, but the position of the protection plate 40 will be adjusted according to the position of the user, so that it is always on the side close to the user, effectively preventing a large amount of dust and debris from affecting the user's vision and physical health. Moreover, since the protection plate 40 can move up and down with the sliding ring 21, when grinding the middle part of the workpiece through the friction plate 50, the angle grinder can be directly pressed down parallelly, and the protection plate 40 moves up, so that the friction plate 50 contacts the surface of the workpiece for direct surface grinding, instead of being restricted by the current protection plate 40 and unable to directly grind the middle part of the workpiece through the friction plate 50, and it is necessary to replace the end face grinding disc to complete the middle part grinding.

[0026] Working principle: When in use, during the process of installing the friction plate 50, the friction plate 50 needs to be pushed along the rotating head 106 onto the limiting ring 301, so that the friction plate 501 on the friction plate 50 is stuck on the limiting ring 301. Then, the auxiliary clamping block 31 is installed and fixed on the limiting ring 301 through the installation pin 311. At this time, the auxiliary clamping block 31 can be clamped by the main clamping block 30 and the auxiliary clamping block 31 and has a certain frictional force with both of them. Then, the angle grinder can be started. At this time, the motor in the head module 10 drives the transmission column 101 to rotate. Through the transmission of the driving bevel gear 102 and the transmission cavity 103, the rotating shaft 104 can be rotated, so that the rotating head 106 also rotates. The main clamping block 30 is fixedly connected to the rotating head 106, so the rotating head 106 can drive the main clamping block 30 to rotate. When the friction plate 50 has no load, the frictional force between the auxiliary clamping block 31 and the main clamping block 30 can drive the friction plate 50 to rotate. When the friction plate 50 has a load, that is, when it starts to contact the workpiece, the frictional force is not enough to drive the friction plate 50 to rotate for operation. Therefore, the main clamping block 30 will rotate relative to the limiting ring 301, so as to overcome the elastic force of the torsion spring 302 and make it tightened. Then, because the torsion spring 302 is restricted by the limiting plate 3012, after the torsion spring 302 is tightened, it drives the limiting ring 301 to rotate under the restriction of the limiting plate 3012, so that the friction plate 50 can be driven by the limiting ring 301 to rotate and perform operations.

[0027] When the friction plate 50 is suddenly stuck by the workpiece, the friction plate 50 stops rotating instantly. At this time, due to the continuous rotation of the motor, a large instantaneous impact force will be generated. This impact force will cause the torsion spring 302 to pull the limiting plate 3012 to squeeze the limiting convex block 3013, so that the limiting plate 3012 rotates, and its limiting plate 3012 is displaced to one side of the chamfer of the limiting convex block 3013. At this time, the inclination angle of the limiting plate 3012 cannot restrict the limiting pin 3021, and it will disengage from the limiting plate 3012, causing the main clamping block 30 to rotate relative to the friction plate 50. Through the joint action of the friction between the two and the elastic restoring force of the torsion spring 302, the instantaneous impact force generated when the friction plate 50 is stuck is greatly reduced, so that only the driving force of the motor exists, effectively avoiding the problem that the friction plate 50 is broken by a large instantaneous impact force and splashing, causing injury to the user.

[0028] When restricted by the environment and the user needs to change their position, but the position of the angle grinder remains unchanged. At this time, the protective plate 40 on the angle grinder cannot block the dust and debris on the side close to the user. At this time, the adjustment ring 12 can be rotated. The adjustment gear 122 drives the adjustment shaft 121 to rotate, and the end face gear 123 drives the driven shaft 221 to rotate, so that the auxiliary wheel 22 rotates. The rotation of the auxiliary wheel 22 can drive the protection rotating ring 20 to rotate. Through the rotation of the protection rotating ring 20, the protective plate 40 can be adjusted to move to a suitable position to block the dust and debris on the side of the user.

[0029] In summary, for this portable intelligent single-phase brushless angle grinder, through the setting of the clamping component, when the friction plate 50 gets stuck on the workpiece during cutting, the huge impact force generated by its rotation acts on the torsion spring 302, causing the torsion spring 302 to pull the limit plate 3012 to rotate. It squeezes the limit protrusion 3013 and crosses the limit protrusion 3013, causing the limit plate 3012 to tilt to the other side. At this time, the angle at the contact between the limit plate 3012 and the torsion spring 302 is greater than 90 degrees. Therefore, the impact force will continue to drive the torsion spring 302 to disengage from the abutting limit plate 3012. Then, the frictional force between the friction plate 50 and the main clamping block 30 and the sub-clamping block 31 cannot restrict the friction plate 50. At this time, the friction plate 50 is stuck and cannot rotate, but the clamping component can continue to rotate. Under the combined action of the frictional force between the main clamping block 30 and the sub-clamping block 31 clamping the friction plate 50 and the elastic tension generated by the abutment of the torsion spring 302 and the limit plate 3012, the impact force of the sudden jamming of the friction plate 50 is slowed down, thereby avoiding the fracture and damage of the friction plate caused by sudden jamming, and also avoiding the splashing of the fragments generated by the fracture of the friction plate, which may cause injury to the staff. Moreover, by manually rotating the friction plate 50 in the reverse direction, the limiting ring 301 can be driven to rotate in the reverse direction by the friction plate 50, so that the torsion spring 302 abuts against the limit plate 3012 and resets it, facilitating repeated use next time; the entire angle grinder can be divided into two modules, which are independent of each other and can be installed together. If one independent part is damaged, it will not affect the other part, and the damaged part of the same model can be directly replaced, greatly saving the replacement time. Or if other heads need to be replaced, such as the heads for drilling, cutting, end face grinding, etc., the head module 10 can be directly disassembled and other heads can be replaced to form a set of equipment with the tail of the angle grinder, greatly saving the production cost. Moreover, its interior is in a sealed state, which can effectively prevent the dust generated by grinding from entering the head module 10 and damaging other electronic components and other parts; through the setting of the rotatable protection component, the position of the protection plate 40 can be manually controlled by the user. During grinding, there are a large amount of debris and dust, but the position of the protection plate 40 will be adjusted according to the different positions of the user, so that it is always on the side close to the user, effectively preventing a large amount of dust and debris from affecting the user's vision and physical health. Moreover, since the protection plate 40 can move up and down along with the sliding ring 21, when grinding the middle part of the workpiece with the friction plate 50, the angle grinder can be directly pressed down parallelly, and the protection plate 40 moves up, so that the friction plate 50 contacts the surface of the workpiece and directly performs surface grinding, instead of being restricted by the current protection plate 40 and being unable to directly grind the middle part of the workpiece with the friction plate 50, and it is necessary to replace the end face grinding disc to complete the grinding of the middle part.

[0030] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A portable intelligent AC single-phase brushless angle grinder, comprising a head module (10) and a body module (11), characterized in that: The body module (11) and the head module (10) are detachably mounted together, and a transmission mechanism and a protective component are provided in the head module (10); The transmission mechanism comprises a rotating shaft (104) and a transmission column (101), wherein the transmission column (101) and the rotating shaft (104) are connected together via a gear, a rotating head (106) is fixed to one side of the rotating shaft (104), a clamping assembly is mounted on the rotating head (106), and a friction plate (50) is mounted on the clamping assembly; The clamping assembly comprises a main clamping block (30) and a secondary clamping block (31); a limiting ring (301) is rotatably connected inside the main clamping block (30); the limiting ring (301) and the main clamping block (30) are connected together via a torsion spring (302); a buckle is provided inside the limiting ring (301); one end of the torsion spring (302) is fixedly connected to the inner wall of the main clamping block (30), and the other end is movably mounted on the buckle.

2. A portable intelligent AC single-phase brushless angle grinder according to claim 1, characterized in that: A limiting cavity (3011) is provided in the limiting ring (301), the buckle is hinged in the limiting cavity (3011), the buckle comprises a limiting plate (3012) and a limiting protrusion (3013), the limiting plate (3012) is mounted on both side end surfaces of the limiting cavity (3011) via a rotating shaft, and the limiting protrusion (3013) is fixedly mounted on both side end surfaces of the limiting cavity (3011).

3. A portable intelligent AC single-phase brushless angle grinder according to claim 2, characterized in that: A limit pin (3021) is fixed to one end of the torsion spring (302), and the limit pin (3021) is buckled with the limit plate (3012). The torsion spring (302) is installed in the gap between the main clamping block (30) and the limit ring (301). The end surface of one side of the limit protrusion (3013) close to the limit plate (3012) is chamfered, and the other side is chamfered.

4. A portable intelligent AC single-phase brushless angle grinder according to claim 1, characterized in that: The friction plate (50) is installed between the main clamping block (30) and the auxiliary clamping block (31); at least two friction plates (501) are arranged in the friction plate (50), and the friction plates (501) are embedded in the limiting ring (301); a mounting pin (311) is detachably mounted on the auxiliary clamping block (31); the mounting pin (311) is also mounted on the limiting ring (301); the auxiliary clamping block (31) and the main clamping block (30) clamp the friction plate (50); the friction plate (50) is restricted between the main clamping block (30) and the auxiliary clamping block (31) by friction; the main clamping block (30) is fixedly mounted on the rotating head (106), and the auxiliary clamping block (31) is movably mounted on the rotating head (106).

5. The portable intelligent AC single-phase brushless angle grinder according to claim 1, characterized in that: A transmission cavity (103) is provided inside the head module (10), the gears comprising a driving bevel gear (102) and a driven bevel gear (105), the driven bevel gear (105) being fixed on the rotating shaft (104), the driving bevel gear (102) being fixed on one side of the transmission column (101), the driving bevel gear (102) and the driven bevel gear (105) being meshed with each other, and a square groove is provided inside the transmission column (101).

6. The portable intelligent AC single-phase brushless angle grinder according to claim 1, characterized in that: The protection assembly comprises a protection swivel (20) and a protection plate (40); the protection swivel (20) is rotatably connected to the head module (10); a rotation groove is provided inside the protection swivel (20); a sliding ring (21) is movably connected inside the rotation groove; and the protection plate (40) is detachably mounted on the sliding ring (21).

7. A portable intelligent AC single-phase brushless angle grinder according to claim 6, characterized in that: An adjusting spring (211) is fixed on the sliding ring (21), the adjusting spring (211) is located in the rotating groove, the adjusting spring (211) abuts against the inner wall of the rotating groove, a collar (401) is fixed on the protective plate (40), the protective plate (40) is located on the outer periphery of the friction plate (50), the collar (401) abuts against the sliding ring (21), the collar (401) is disconnected in the middle, two extension blocks (4011) are provided at the disconnected portion, and bolts (4012) are installed on the extension blocks (4011).

8. The portable intelligent AC single-phase brushless angle grinder according to claim 6, characterized in that: An auxiliary wheel (22) is also rotatably connected inside the head module (10), a driven shaft (221) is fixed on the auxiliary wheel (22), the auxiliary wheel (22) cooperates with the protective rotating ring (20), and the driven shaft (221) first extends to the outside from a side close to the fuselage module (11).

9. A portable intelligent AC single-phase brushless angle grinder according to claim 8, characterized in that: An adjusting shaft (121) is rotatably connected inside the head module (10); an adjusting gear (122) is fixed to one end of the adjusting shaft (121); and an end face gear (123) is fixed to the other end; the end face gear (123) meshes with the end face of the outer portion of the driven shaft (221); an adjusting ring (12) is also rotatably connected to the outer peripheral side of the body module (11); the adjusting ring (12) meshes with the adjusting gear (122).

10. The portable intelligent AC single-phase brushless angle grinder according to claim 1, characterized in that: An auxiliary handle (13) is also detachably mounted on the head module (10), a motor is also arranged inside the body module (11), the motor is electrically connected to an external wire, and heat dissipation holes are provided on the outer peripheral side of the body module (11).

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