CN114683145A

CN114683145A - Angle grinder

Info

Publication number: CN114683145A
Application number: CN202210504968.2A
Authority: CN
Inventors: 方淑燕
Original assignee: Individual
Current assignee: Zhejiang Jinzhida Electrical Co ltd
Priority date: 2022-05-10
Filing date: 2022-05-10
Publication date: 2022-07-01
Anticipated expiration: 2042-05-10
Also published as: CN114683145B

Abstract

The invention relates to an angle grinder, which comprises a grinder body and a grinder head arranged on the grinder body, wherein a connecting bracket is arranged at the joint of the grinder body and the grinder head, a polishing sheet is arranged on an output shaft of the grinder head, a rotatable protective cover mechanism is sleeved on the output shaft, and a dust suction mechanism is arranged in the protective cover mechanism. The invention introduces the power of the angle grinder as the power of dust collection, saves the cost, more importantly saves the space and avoids the complexity of preparation work and the restriction in use caused by accessing the dust collector from the outside, and the difference between the rotating speed of the angle grinder and the rotating speed of the dust collector is very small, and the dust collection effect close to that of the dust collector can be obtained by the power; the rotation of the dust suction mechanism does not interfere with the rotation of the protective cover mechanism, namely the dust suction mechanism can rotate freely in the range of the exposed working surface of the polishing sheet so as to absorb dust at any angle when the polishing sheet throws the dust.

Description

Angle grinder

Technical Field

The invention belongs to the technical field of angle grinders, and particularly relates to an angle grinder with dust collection and mist cooling functions.

Background

The angle grinder is a most commonly used hand-held grinding tool for grinding workpieces, and mainly utilizes a grinding wheel sheet rotating at a high speed to grind various metal parts, glass fiber reinforced plastic products, stone materials and the like, and the angle grinder has two problems in the operation process: firstly, the ground dust and fine particles are very much, and the fine particles are thrown out in a wide range under the action of the high-speed driving of the abrasive disc due to the continuous change of the positions and angles to be ground during operation, and the dust is diffused in the peripheral air of the operating personnel, so that the adverse effect is brought to the health of the operating personnel, and the cleaning work of the operating environment is very difficult; secondly, the grinding wheel of the angle grinder generates a large amount of heat during grinding, so that the grinding wheel is subjected to high-temperature wear to aggravate, thereby influencing the service life, and the grinding wheel is easy to break due to high temperature during use to cause accidents.

In order to solve the problem of dust in the prior art, the technical scheme is as follows: the chinese patent application publication No. CN112223119A discloses a dust cover for an angle grinder, comprising: the dust cover, a fixing piece fixed on the dust cover through a fastening piece and a dust outlet pipe communicated with the dust cover, wherein the dust outlet pipe is arranged along the cutting direction, the dust cover is provided with a mounting hole, and the fixing piece is fixedly connected to the dust cover outside the mounting hole through the fastening piece; the fastener comprises an L-shaped support frame, wherein the L-shaped support frame comprises a horizontal section movably connected in a support frame sliding groove and a vertical section vertical to the horizontal section. The dust cover is arranged on the angle grinder, and can completely absorb dust without leakage after being connected with a dust collector. This technical scheme's installation adjustment is more loaded down with trivial details to the mode of the whole parcel of dust cover has produced very big blockking to the sight when the operation personnel operation, and the dust cover is fixed like this can be because the interference of dust cover can't use the angle mill to polish to some special or the special work piece of angle of shape, still needs external dust catcher to make this technical scheme have the many and the loaded down with trivial details drawback of operating procedure of preparation work in addition.

The Chinese invention patent application publication No. CN112621503A discloses an angle grinder, which comprises a grinder body, a grinding disc rotatably connected to the bottom of the grinder body, an upper disc, a lower disc and an arc-shaped stop block arranged between the opposite side walls of the upper disc and the lower disc, wherein the upper disc is arranged on the side wall of the bottom of the grinder body, a cooling chamber for the grinding disc to extend into is formed by enclosing the opposite side walls of the upper disc, the lower disc and the arc-shaped stop block, a fog cooling component and a spraying component for cooling the grinding disc are respectively arranged in the cooling chamber, a groove is arranged in the side wall of the grinder body, and a water supply component for supplying water to the fog cooling component and the spraying component is arranged in the groove. This application has the effect of cooling down and water-cooling in order to avoid mill high temperature and take place wearing and tearing to mill fog. The grinding disc in the technical scheme is equivalent to a shield of the angle grinder, the shield of the angle grinder needs to be changed to a position when different workpieces are ground, and the position of the grinding disc in the technical scheme cannot be adjusted, so that certain limitation is brought to the use range in use.

Disclosure of Invention

In view of the defects in the prior art, the technical problem to be solved by the invention is to provide an angle grinder which has dust collection and fog cooling functions, and two functional components of dust collection and fog cooling can be adjusted in position when the angle grinder is used, wherein the dust collection power is derived from the power of the angle grinder.

The invention aims to be realized by the following technical scheme: an angle grinder comprises a grinder body and a grinder head arranged on the grinder body, wherein a connecting bracket is arranged at the joint of the grinder body and the grinder head, a polishing sheet is arranged on an output shaft of the grinder head, a rotatable protective cover mechanism is sleeved on the output shaft, and a dust suction mechanism is arranged in the protective cover mechanism; the protection cover mechanism comprises a protection cover sleeved on the output shaft and a fog cooling assembly arranged in the protection cover.

Preferably, the connecting bracket is provided with a power assembly therein. The power assembly is arranged to provide power for the rotation of the protective cover mechanism and the rotation of the dust collection mechanism.

Preferably, the mist cooling assembly is used to reduce the temperature of the polishing pad during operation to avoid rapid wear of the polishing pad at high temperatures. The protective cover is provided with a protective baffle plate, the plate surface of the protective baffle plate is vertical to the output shaft of the angle grinder, the central position of the protective baffle plate is a circular thickened area, the outer side of the circular part of the protective baffle plate is semicircular, the outermost edge of the semicircle is provided with an arc-shaped side protective plate which extends downwards and is vertical to the plate surface, the edge of the thickened area is provided with a circular concave guide rail groove around the center, and a check ring is arranged in the guide rail groove; guard shield central point puts the position of installing the polishing piece and the inconsistent locking of guard shield, also be the position that also needs the atress, consequently with the intensity of this position thickening in order to increase the guard shield, the region of thickening has also left the space that sets up for the setting in guide rail groove simultaneously, the guide rail groove is used for holding the outer section that expands of carousel, the retaining ring pressure of setting just can rotate around the center of guard shield on expanding section upper portion like this, also the carousel can rotate around the output shaft, utilize setting up of this thickening district guide rail groove to realize that protection casing mechanism and dust absorption mechanism all can rotate around the output shaft like this, thereby further design the dust absorption on this basis, and the function of protection, and design also can adjust when the operation and make it rotate suitable position respectively.

Preferably, the dust suction mechanism comprises a turntable driving assembly sleeved on the upper surface of the thickened area. The rotary table driving assembly is used for driving the rotary table to rotate so that the dust collection mechanism arranged on the upper portion of the rotary table rotates to a position corresponding to dust throwing.

Preferably, the turntable driving assembly comprises a turntable, the edge of the turntable is provided with an outward expanding section which extends downwards and outwards, the width of the outward expanding section is the same as that of the guide rail groove, the thickness of the outward expanding section is the same as the clearance size between the retainer ring and the guide rail groove, the turntable and the shield are matched through the outward expanding section and the guide rail groove, and the retainer ring partially covers the outward expanding section. So that the two can rotate tightly after being matched.

Preferably, the turntable driving assembly further comprises a first circular rack and a first engaging wheel engaged with the first circular rack, and the first circular rack is mounted on the part of the outward expansion section which is not covered by the retainer ring. The retaining ring is arranged to cover the outer expanding section part, so that the reserved part can be provided with a first circular rack, and the first circular rack is used as a transmission piece to drive the rotary disc to rotate.

Preferably, the dust collection mechanism further comprises a power adapter assembly arranged on the output shaft and a nozzle assembly detachably arranged in the power adapter assembly; the power switching assembly comprises a worm gear transmission part and a worm mounting seat, wherein the worm gear transmission part is connected with the output shaft through a worm wheel; the worm mounting seats are respectively provided with a worm for mounting the worm, and are fixedly arranged on the upper surface of the turntable; one end of the worm, which is far away from the machine body, is provided with threads, and the center of the end part of the worm is provided with a fan installation shaft which extends outwards. In the scheme, the relative positions of the worm wheel and the worm of the transmission piece are fixed, and the turntable is used as a carrier, namely, the nozzle assembly can rotate by driving the rotation of the turntable under the condition of not stopping dust collection.

Preferably, the nozzle assembly comprises a connecting section, a fan bin, a dust collecting bin, a pipe body section and a suction nozzle, wherein one end of the connecting section is meshed with the threaded end of the worm in the worm gear transmission part; a dust outlet cover is arranged on the downward side of the fan bin, a fan is arranged in the fan bin, and an input shaft of the fan is connected with a fan mounting shaft. The output rotating speed of the angle grinder is 15000 turns, and the rotating speed of the dust collector is about 18000 turns, so that the power source of the fan is designed to be connected with the worm through the fan mounting shaft by the scheme, namely the fan is driven by the autonomous power of the angle grinder, the purpose of dust collection is achieved, a driving device does not need to be arranged independently, and meanwhile, the weight is reduced, and the cost and the space are saved.

Preferably, the shield mechanism further comprises a shield drive assembly including a second circular rack mounted on the upper surface of the shield and a second engagement wheel engaged with the second circular rack. The shield driving assembly is arranged in a manner of matching a gear and a rack as the turntable driving assembly, so that two transmission devices can be arranged at the same position in a compact position space.

Preferably, the power assembly comprises a mounting seat connected with the connecting support, motor seat plates arranged on two sides of the mounting seat respectively, and a first motor transmission piece and a second motor transmission piece which are arranged in the two motor seat plates respectively; the first motor transmission part is connected with the first meshing wheel, and the second motor transmission part is connected with the second meshing wheel. The axle part of first meshing wheel sets up to the axle part that can closely pass second meshing wheel 322, and first motor drive spare just can connect respectively with second motor drive spare position stagger like this, and the axle part of first meshing wheel is connected to first motor drive spare promptly, and the axle part of second meshing wheel is connected to second motor drive spare. The required position for the erection of the power module part can thus be relatively small.

In conclusion, compared with the prior art, the invention has the following advantages:

the invention combines dust collection and fog cooling together, thus even in a use place with extremely large dust amount, such as grinding glass fiber reinforced plastic, the dust can be greatly reduced under the simultaneous action of the dust collection and the fog cooling, thereby reducing the harm to human bodies, the dust collection of the invention uses the power of the angle grinder, the cost is saved, more importantly, the space is saved, the restriction in use and the preparation work caused by the external connection of a dust collector is avoided in the background technology, the difference between the rotating speed of the angle grinder and the rotating speed of the dust collector is very small, and the dust collection effect close to the dust collector can be obtained by using the power;

the angle grinder is used for grinding workpieces with special shapes or angles, and the workpieces can interfere with the protective cover, so the invention is designed to be sleeved with the rotatable protective cover mechanism on the output shaft, and the rotation of the protective cover mechanism is set to be controllable in the operation process, so that the protective cover can rotate in a certain range around the machine body, the interference can be avoided by rotating the protective cover when the workpieces with special angles interfere with the protective cover, because the dust and the crushed slag are continuously thrown outwards under the condition of changing the angle continuously during the operation of the angle grinder, the rotatable dust collection mechanism is arranged in the protective cover mechanism, the dust and the crushed slag thrown out by the suction nozzle of the dust collection mechanism facing the throwing direction can be quickly absorbed, the rotation of the dust collection mechanism is based on the rotation of one side of the open surface of the protective cover mechanism, namely the work surface with the exposed polishing sheet, however, the rotation of the dust suction mechanism does not interfere with the rotation of the protective cover mechanism, namely the dust suction mechanism can rotate freely in the range of the working surface exposed out of the polishing sheet to absorb dust at any angle when the polishing sheet throws the dust, and the two mechanisms share one protective cover to serve as a rotating basic structure, so that a good dust suction effect is obtained in a very limited space through reasonable arrangement, and the use range during working is expanded.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a front view of the present invention with the fuselage hidden;

FIG. 3 is a left side view of the present invention;

FIG. 4 is an exploded view of the rear portion of the body, handle, nozzle assembly with parts hidden;

FIG. 5 is a schematic view of the structure of the shield and the fog cooling assembly after combination;

fig. 6 is a schematic structural diagram of the combination of the bracket, the turntable driving assembly, the power adapter assembly, the protective cover mechanism and the power assembly.

The labels in the figure are:

a machine body 001; a handpiece 002; an output shaft 003; a polishing sheet 004; a start switch 005; a travel limit switch 006; a toggle switch 007; a handle 008; a push button switch 009; a connecting bracket 100; a dust suction mechanism 200; a nozzle assembly 210; a connecting section 211; a fan housing 212; a dust collecting bin 213; a body section 214; a suction nozzle 215; a dust outlet cover 216; a fan 217; a turntable drive assembly 220; a first circular rack 221; a turntable 222; an flaring segment 2221; the first engagement wheel 223; a power adapter assembly 230; a worm gear drive 231; a worm mount 232; a fan mounting shaft 2321; a shield mechanism 300; a shield 310; a guard 311; thickened region 312; a skirt 313; a rail groove 314; a retaining ring 315; a shroud drive assembly 320; a second circular rack 321; a second engagement wheel 322; a mist cooling assembly 330; a substrate 331; a water tank 332; a battery 333; an arcuate tube 335; a nozzle 336; a water pump 334; a power assembly 400; a mounting seat 410; a first motor drive 420; second motor drive 430; a motor base plate 440.

Detailed Description

The invention will be further described with reference to the embodiments shown in the drawings to which:

example 1

As shown in fig. 1-2, an angle grinder comprises a body 001, a machine head 002 mounted on the body 001, a connecting bracket 100 arranged at the connecting position of the body 001 and the machine head 002, a polishing sheet 004 mounted on an output shaft 003 of the machine head 002, a rotatable protective cover mechanism 300 sleeved on the output shaft 003, a dust suction mechanism 200 rotatable relative to the center of the protective cover mechanism 300 arranged in the protective cover mechanism 300, and power assemblies 400 respectively arranged in the connecting brackets 100 for providing power for the protective cover mechanism 300 and the dust suction mechanism 200.

As shown in fig. 4-6, the protection cover mechanism 300 includes a protection cover 310 covering the output shaft 003, and a mist cooling assembly 330 installed in the protection cover 310; the protective cover 310 is provided with a protective baffle 311 with a plate surface vertical to the output shaft 003 of the angle grinder, the central position of the protective baffle 311 is a circular thickened area 312, the outer side of the circular part of the protective baffle 311 is semicircular, the outermost edge of the semicircle is provided with an arc-shaped side protective plate 313 which extends downwards and is vertical to the plate surface, the edge of the thickened area 312 is provided with a circular concave guide rail groove 314 around the center, and a retainer ring 315 is arranged in the guide rail groove 314;

as shown in fig. 1 to 6, the mist cooling module 330 includes an arc-shaped base 331 having two surfaces respectively attached to the guard plate 311 and the side guard plate 313, a water tank 332 and a battery 333 installed on the upper surface of the base 331, a water pump 334 connected to the water tank 332, an arc-shaped arc pipe 335 installed on the side surface of the base 331, and a plurality of nozzles 336 connected to and communicated with the arc pipe 335; the nozzle 336 faces the skirt 313 and passes through the skirt 313; the arc length of the base plate 331 is the same as that of the shield 310 and the two are aligned, the water tank 332 is installed at one end part close to the base plate 331, and the battery 333 is installed at the other end part close to the base plate 331; travel limit switches 006 are respectively provided on the upper surfaces of the water tank 332 and the battery 333;

the dust suction mechanism 200 comprises a turntable driving assembly 220 sleeved on the upper surface of the thickened area 312; the turntable driving assembly 220 is used for driving the turntable to rotate, so that the dust suction mechanism arranged on the upper part of the turntable rotates to a corresponding position where dust is thrown.

The turntable driving assembly 220 comprises a turntable 222, the edge of the turntable 222 is provided with a flared section 2221 which extends downwards and outwards, the width of the flared section 2221 is the same as the width of the guide rail groove 314, the thickness of the flared section 2221 is the same as the clearance between the retaining ring 315 and the guide rail groove 314, both the turntable 222 and the shield 310 are matched through the flared section 2221 and the guide rail groove 314, the retaining ring 315 partially covers the flared section 2221, and after matching, the turntable 222 can rotate relative to the center of the shield 310 and cannot be separated due to the blocking of the retaining ring 315 when the shield 310 tilts or overturns.

The turntable driving assembly 220 further comprises a first circular rack 221 and a first engaging wheel 223 engaged with the first circular rack 221, wherein the first circular rack 221 is mounted on the portion of the flared section 2221 which is not covered by the retaining ring 315;

the dust suction mechanism 200 further comprises a power adapter assembly 230 mounted on the output shaft 003 and a nozzle assembly 210 detachably mounted in the power adapter assembly 230; the power adapter assembly 230 comprises a worm gear transmission 231, a worm mounting seat 232 and a worm, wherein the worm gear of the worm gear transmission is connected with the output shaft 003; the worm mounting seats 232 are respectively provided on the worms for mounting the worms, and the worm mounting seats 232 are fixedly mounted on the upper surface of the turntable 222; one end of the worm, which is far away from the machine body 001, is provided with threads, and the center of the end part is provided with a fan mounting shaft 2321 which extends outwards;

the nozzle assembly 210 comprises a connecting section 211 with one end engaged with the thread end of the worm in the worm gear 231, a fan bin 212 with one end connected with the other end of the connecting section 211, a dust collecting bin 213 with one end connected with the other end of the fan bin 212, a pipe body section 214 with one end connected with the other end of the dust collecting bin 213, and a suction nozzle 215 with one end connected with the other end of the pipe body section 214; a dust outlet cover 216 is arranged on the downward side of the fan bin 212, a fan 217 is arranged in the fan bin 212, and an input shaft of the fan 217 is connected with a fan mounting shaft 2321;

guard mechanism 300 further comprises a guard drive assembly 320, the guard drive assembly 320 comprising a second circular rack 321 mounted on the upper surface of guard 310 and a second engagement wheel 322 engaged with second circular rack 321;

the power assembly 400 includes a mounting base 410 connected to the connection bracket 100, motor base plates 440 respectively disposed at both sides of the mounting base 410, a first motor driving member 420 and a second motor driving member 430 respectively installed in the two motor base plates 440; the output shafts of first motor drive 420 and second motor drive 430 are set to a locked state when not activated, first motor drive 420 being connected to first engagement wheel 223, second motor drive 430 being connected to second engagement wheel 322; as shown in fig. 4 and 6, the shaft portion of first engaging wheel 223 is configured to closely penetrate the shaft portion of second engaging wheel 322, so that first motor driver 420 and second motor driver 430 are coupled with a staggered position, that is, first motor driver 420 is coupled with the shaft portion of first engaging wheel 223 and second motor driver 430 is coupled with the shaft portion of second engaging wheel 322. The required position for partial erection of the power assembly 400 can thus be relatively small.

The tail part close to the machine body 001 is provided with a starting switch 005, the adjacent starting switch 005 is provided with a toggle switch 007 used for starting the positive and negative rotation of the second motor transmission piece 430, the lateral part of the head part of the machine body 001 is provided with a handle 008 connected with the machine body 001, the handle is internally provided with two button switches 009, and the two button switches 009 respectively control the positive rotation and the negative rotation of the first motor transmission piece 420.

When in use: an operator holds the handle 008 with one hand and the tail of the body 001 with the other hand, dials the start switch 005 to start the angle grinder, at this time, the output shaft 003 rotates to drive the worm gear transmission 231 to rotate, the corresponding fan mounting shaft 2321 rotates synchronously, the fan mounting shaft 2321 drives the fan 217 to rotate to form negative pressure in the nozzle assembly 210, the suction nozzle 215 generates suction force, and the rotation speed of the angle grinder is approximate to that of a general dust collector at about 15000 revolutions, so that the suction force has the same dust collection effect as the dust collector;

according to the position and shape of the workpiece to be ground, the shield 310 is adjusted to a proper position so that two ends of the shield 310 cannot interfere with the workpiece, specifically, the toggle switch 007 is toggled to start the second motor transmission piece 430, the second motor transmission piece 430 drives the second meshing wheel 322 to rotate, the second meshing wheel 322 drives the second circular rack 321 meshed with the second motor transmission piece to generate rotary displacement, and any one end of the rotatable range of the shield 310 does not exceed the machine body 001 on the same side of the rotatable range of the shield, so that firstly, the shield 310 mainly plays a role of protecting a user, so that the rotatable range of the upper nozzle assembly 210 is always close to one side of the user, namely one side of the machine body 001, and secondly, the nozzle assembly 210 on the upper portion is prevented from interfering with the machine body 001 when the rotary table 222 rotates, so that only the rotatable range of the nozzle assembly 210 is controlled in the range of the open side of the shield 310;

starting a water pump 334 in the fog cooling assembly 330, and spraying water in a water tank 332 into the polishing sheet 004 from a nozzle 336 through an arc-shaped pipe 335 by the water pump 334 to play a role of cooling during polishing;

the position of the suction nozzle 215 is adjusted in real time by the dust suction mechanism 200 in the grinding process so as to correspond to the position of the ground fine particles and the dust cast, specifically, the button switch 009 on one side of the handle 008 is correspondingly pressed, the first motor transmission member 420 is started to drive the first meshing wheel 223 to rotate, the corresponding first circular rack 221 generates rotational displacement under the rotation of the first meshing wheel 223, namely, the turntable 222 correspondingly rotates, the nozzle assembly 210 mounted on the upper part of the turntable 222 correspondingly rotates until the suction nozzle 215 rotates to the position of the dust cast, the button switch 009 is released, when the grinding at the position is completed, the grinding position needs to be switched, the button switch 009 on one side of the handle 008 correspondingly adjusts the position of the suction nozzle 215, in the process of adjusting the nozzle assembly 210, under the condition that the button switch 009 is not timely released, because the travel limit switches 006 are respectively arranged on the upper surfaces of the water tank 332 and the battery 333, there is no collision of the nozzle assembly 210 with the fuselage.

It should be noted that if the selected angle grinder has a function of adjusting the gear position of the rotating speed, when the angle grinder is in a low gear, the thrown distance of the ground dust and the ground slag is relatively short, and the force is relatively small, the corresponding fan 217 can meet the requirements under the conditions of relatively low rotating speed and relatively small suction force; when the dust and the broken slag are in a high-speed gear, the thrown distance of the grinded dust and the broken slag is relatively long, and the force is relatively large, so that the rotating speed of the corresponding fan 217 is relatively high, and the suction force is relatively large, and the dust collection requirement is also met.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. An angle grinder comprises a grinder body (001) and a grinder head (002) arranged on the grinder body (001), and is characterized in that a connecting bracket (100) is arranged at the joint of the grinder body (001) and the grinder head (002), a polishing sheet (004) is arranged on an output shaft (003) of the grinder head (002), a rotatable protective cover mechanism (300) is sleeved on the output shaft (003), and a dust suction mechanism (200) is arranged in the protective cover mechanism (300); the protective cover mechanism (300) comprises a protective cover (310) sleeved on the output shaft (003) and a fog cooling component (330) arranged in the protective cover (310).

2. The angle grinder of claim 1, characterized in that a power assembly (400) is provided in the connecting bracket (100).

3. The angle grinder of claim 1, wherein the shield (310) is provided with a guard plate (311) with a plate surface perpendicular to the output shaft (003) of the angle grinder, the center of the guard plate (311) is provided with a circular thickened area (312), the outer side of the circular part of the guard plate (311) is semicircular, the outermost edge of the semicircle is provided with an arc-shaped side guard plate (313) which extends downwards perpendicular to the plate surface, the edge of the thickened area (312) is provided with a circular annular concave guide rail groove (314) around the center, and a retainer ring (315) is arranged in the guide rail groove (314).

4. The angle grinder of claim 3, wherein the dust suction mechanism (200) comprises a turntable drive assembly (220) disposed on an upper surface of the thickened region (312).

5. The angle grinder of claim 4, wherein the turntable drive assembly (220) comprises a turntable (222), the edge of the turntable (222) is provided with an outward expanding section (2221) extending downwards and outwards, the width of the outward expanding section (2221) is the same as that of the guide rail groove (314), the thickness of the outward expanding section (2221) is the same as the clearance between the retainer ring (315) and the guide rail groove (314), the turntable (222) and the shield (310) are matched through the outward expanding section (2221) and the guide rail groove (314), and the retainer ring (315) partially covers the outward expanding section (2221).

6. The angle grinder of claim 5, wherein the turntable drive assembly (220) further comprises a first circular rack (221) and a first engagement wheel (223) engaged with the first circular rack (221), the first circular rack (221) being mounted on a portion of the flared section (2221) not covered by the retainer ring (315).

7. The angle grinder of claim 5, wherein the dust suction mechanism (200) further comprises a power adapter assembly (230) mounted on the output shaft (003) and a nozzle assembly (210) detachably mounted in the power adapter assembly (230); the power switching assembly (230) comprises a worm gear transmission piece (231) and a worm mounting seat (232), wherein the worm gear transmission piece is connected with the output shaft (003) and used for mounting a worm; the worm mounting seats (232) are respectively arranged on the worms and used for mounting the worms, and the worm mounting seats (232) are fixedly arranged on the upper surface of the turntable (222); one end of the worm, which is far away from the machine body (001), is provided with threads, and the center of the end part of the worm is provided with a fan mounting shaft (2321) which extends outwards.

8. The angle grinder of claim 7, wherein the nozzle assembly (210) comprises a connection section (211) having one end engaged with a threaded end of a worm of the worm gear drive (231), a blower compartment (212) having one end connected to the other end of the connection section (211), a dust collection compartment (213) having one end connected to the other end of the blower compartment (212), a tube body section (214) having one end connected to the other end of the dust collection compartment (213), and a suction nozzle (215) having one end connected to the other end of the tube body section (214); a dust outlet cover (216) is arranged on the downward side of the fan bin (212), a fan (217) is arranged in the fan bin (212), and an input shaft of the fan (217) is connected with a fan mounting shaft (2321).

9. The angle grinder of claim 6, wherein the shield mechanism (300) further comprises a shield drive assembly (320), the shield drive assembly (320) comprising a second circular rack gear (321) mounted on an upper surface of the shield (310) and a second engagement wheel (322) engaged with the second circular rack gear (321).

10. The angle grinder of claim 9, wherein the power assembly (400) includes a mounting base (410) connected to the connection bracket (100), motor base plates (440) respectively provided at both sides of the mounting base (410), a first motor transmission member (420) and a second motor transmission member (430) respectively installed in the two motor base plates (440); the first motor drive member (420) is connected to the first engagement wheel (223) and the second motor drive member (430) is connected to the second engagement wheel (322).