CN114559341A

CN114559341A - Angle grinder

Info

Publication number: CN114559341A
Application number: CN202210036726.5A
Authority: CN
Inventors: 阳小飞; 徐聪; 李金霞
Original assignee: Jiangsu Hehui Power Tools Co ltd
Current assignee: Jiangsu Hehui Power Tools Co ltd
Priority date: 2022-01-13
Filing date: 2022-01-13
Publication date: 2022-05-31
Anticipated expiration: 2042-01-13
Also published as: CN114559341B

Abstract

The application relates to an angle grinder, which aims to solve the technical problems that because the angle grinder can be used for grinding and cutting, but in the cutting process, the probability of injury of operators is high due to insufficient protective measures, and the safety performance is low; the protection casing is arranged on the machine body and is fan-shaped, the inside of the protection casing is rotatably connected with two extension plates, the top wall of the inner side wall of the protection casing is provided with a sliding groove, the top of each extension plate is provided with a sliding block inserted in the sliding groove, the protection casing is positioned around the main shaft and is provided with a fixed ring pipe, the extension plates are provided with positioning rings sleeved on the fixed ring pipe, and the two ends of the protection casing are respectively provided with a locking mechanism for positioning the positions of the extension plates. This application has and leads to the probability on operating personnel hand in reducing angle mill use, improves angle mill's factor of safety's effect.

Description

Angle grinder

Technical Field

The application relates to the field of grinding and cutting equipment, in particular to an angle grinder.

Background

An angle grinder, also called a grinder or a disc grinder, is an apparatus for cutting and grinding glass fiber reinforced plastics, and is often used to cut, grind and grind metals, stone materials, and the like.

In the related art, chinese patent publication No. CN107914206A discloses a brushless angle grinder, comprising: the shell assembly comprises a head shell and a shell connected with the head shell, the head shell and the shell are enclosed into a cavity, and a working head is arranged in the head shell; the motor is arranged in the cavity and is close to the working head; and the dustproof mechanism is covered on the outer edges of the two axial ends of the stator of the motor and can seal the stator coil and the slot gap between the stator and the rotor. Guarantee the dustproof effect of motor through dustproof mechanism, the dustproof problem of effectual solution motor avoids impurity such as dust and iron fillings to get into the rotor, the life of extension motor, improves brushless angle mill's reliability

In the process of using the angle grinder, the inventor finds that at least the following problems exist in the technology: because the angle grinder can be used for grinding and can also be used for cutting, in the cutting process, the protection measures are insufficient, the probability of injury of operators is high, and the safety performance is low.

Disclosure of Invention

In order to reduce the probability that leads to operating personnel to be on hand in the angle mill use, improve angle mill's factor of safety, this application provides an angle mill.

The application provides an angle mill adopts following technical scheme:

an angle grinder comprises a grinder body, wherein a main shaft is rotatably connected to the grinder body, and a grinding sheet is arranged on the main shaft; the novel protective cover is characterized in that a protective cover is arranged on the machine body and is fan-shaped, two extending plates are rotatably connected inside the protective cover, a sliding groove is formed in the top wall of the inner side wall of the protective cover, sliding blocks inserted into the sliding groove are arranged at the tops of the extending plates, the protective cover is located on the periphery of the main shaft and is provided with a fixing ring pipe, the extending plates are provided with positioning rings sleeved on the fixing ring pipe, and locking mechanisms for positioning the extending plates are arranged at the two ends of the protective cover respectively.

Through adopting above-mentioned technical scheme, in cutting process or abrasive machining process, if need increase the protection area, then pull out the extension board from the protection casing, because the extension board cover is established on fixed ring pipe, therefore the extension board can rotate for fixed ring pipe, and when the extension board rotated preset position, fixed extension board and protection casing through locking mechanism to improve the protection scope of protection casing greatly, improved the factor of safety in the angle mill use.

In a specific can embodiment, locking mechanism is including inserting dwang, the extension rod of connection on the dwang of establishing on the protection casing, setting up the locking pole on the extension rod and being located the locking piece of locking pole tip, the dwang is radially inserted along the protection casing and is established in the protection casing, the extension rod perpendicular to dwang, the locking pole is perpendicular and extension rod and be on a parallel with the dwang, the locking arc groove that supplies the locking pole to insert to establish is all seted up to the extension plate both sides.

Through adopting above-mentioned technical scheme, through rotating the dwang, the extension rod that sets up on the dwang swings thereupon, and the setting also swings thereupon at the lock bar that extends the rod tip, can follow the dwang and carry out parallel swing for the centre of a circle, therefore can follow the bottom that the locking arc groove swung to locking arc groove, because the extension board advances to rotate as the centre of a circle with fixed ring pipe, therefore can carry out the locking to the position of extension board when the lock bar inserts in the locking arc groove, thereby play and fix the effect together with the protection casing extension board.

In a specific possible embodiment, one end of the rotating rod, which is far away from the extension rod, is provided with a shifting rod, and the end part of the shifting rod is provided with a shifting block so as to shift the rotating rod to rotate and drive the locking rod to be horizontally inserted into the locking arc groove.

Through adopting above-mentioned technical scheme, through waveing the shifting block, can drive the driving lever and rotate to be convenient for rotate the dwang, increased dwang pivoted moment greatly, make the dwang rotate and become more laborsaving, be more convenient for drive the locking lever and insert in order to carry out the locking to the extension board in the locking arc groove.

In a specific can embodiment, extension board bottom is provided with and is used for carrying out the closed arc board that covers to the protection casing bottom, be provided with a plurality of containers on the protection casing lateral wall, it has the protection reed to coil in the container, protection reed tip one side is provided with the drive block, the groove of stepping down that supplies the drive block to slide is seted up to container lateral wall, be provided with the fixed establishment who carries out the locking to the position of protection reed on the drive block.

Through adopting above-mentioned technical scheme, the setting of sealing the arc board can increase the baffle of one deck protection in the bottom of angle mill, and the protection reed in the holding shell can be pulled out and fix through fixed establishment from holding the shell when needs shelter from the protection casing bottom to the factor of safety of protection casing bottom one side has been improved greatly.

In a specific possible implementation scheme, the fixing mechanism comprises a rotating shaft, a positioning block rotatably connected to the rotating shaft and an anti-falling block arranged at the end of the rotating shaft, the positioning block is sleeved on the rotating shaft and can slide along the length direction of the rotating shaft, the accommodating shell is provided with a locking groove for the positioning block to be inserted, and the locking groove is used for the positioning block to be inserted along the length direction of the rotating shaft.

Through adopting above-mentioned technical scheme, at the in-process that the protection reed removed, rotatory to unanimous with the groove direction of stepping down with the locating piece, the locating piece can slide in the groove of stepping down this moment, and when needs are fixed the protection reed, rotate the locating piece to and step down groove looks vertically angle, and slide the locating piece along pivot length direction, make the locating piece insert in the locking groove, the lateral wall of locating piece offsets with the inner wall of constant head tank this moment, thereby can carry out the locking to the position of protection reed and fix, convenient and fast and high-efficient practical.

In a specific possible embodiment, the end of the protection reed is provided with a positioning tube, one of the closed arc plates is provided with a containing tube, a fixing rope is fixed in the containing tube through a coil spring, one end of the fixing rope is provided with a traction arc rod, the traction arc rod penetrates through all the positioning tubes and then is fixed on the other closed arc plate, and the other closed arc plate is provided with a locking mechanism for fixing the traction arc rod.

By adopting the technical scheme, the traction arc rod in the containing pipe is arranged in each positioning pipe in a penetrating manner along with the fixing rope, each positioning pipe can be penetrated through the fixing rope, and the traction arc rod is fixed on the other closed arc plate, so that on one hand, the position of the protection reed can be reinforced, the position of the protection reed is prevented from being deviated, the impact force of the abrasive cutting piece during crushing is effectively buffered, the crushed abrasive cutting piece is effectively shielded, and the probability of people injury caused by burst is reduced; on the other hand, can consolidate the extension board of protection casing both sides to build the skew of musical instrument extension board position, reduce the extension board and break away from the locking and can't play the probability of protection.

In a specific possible embodiment, the locking mechanism includes a fixed tube into which the traction arc rod is inserted, a fixed block in threaded connection with the traction arc rod, and a pair of shifting pieces located on the side wall of the fixed block, the fixed block abuts against the end wall of the fixed tube, and a limit member for preventing the fixed rope from being released from the accommodating tube is arranged at one end of the fixed rope far away from the traction arc rod.

Through adopting above-mentioned technical scheme, rotate fixed block and traction arc pole threaded connection through the plectrum to make the fixed block offset with the end wall of fixed pipe, thereby fix traction arc pole on sealed arc board effectively, improved the fixed reliability of traction arc pole, convenient and fast easily dismouting.

In a specific embodiment, a locking plate is arranged on the spindle, a locking hole is formed in the locking plate, a positioning rod is connected to the machine body in a sliding mode, a detection mechanism for detecting a human body is arranged on the machine body, the detection mechanism is electrically connected with a control device, and the control device is electrically connected with a reset mechanism so that the positioning rod is released and inserted into the locking hole to achieve emergency stop locking.

Through adopting above-mentioned technical scheme, whether detection device detects someone in to the predetermined distance, when detecting someone, sends a signal for controlling means, and controlling means control canceling release mechanical system resets the locating lever, and the locating lever inserts in the locking hole, locks the locking plate to with the main shaft scram when coming into contact with the staff soon, effectively reduced because of the injured probability of operating personnel of artificial maloperation and leading to.

In a specific implementation scheme, the detection mechanism comprises an infrared detection device for detecting a human body and a capacitance sensor for detecting the human body, the control device controls the reset mechanism to reset when the infrared detection device and the capacitance sensor both send signals, the reset mechanism comprises a pressing spring arranged on the machine body and an electromagnet arranged on the machine body, the electromagnet is used for adsorbing the positioning rod to move upwards, a pressing block is arranged on the positioning rod, and the pressing spring is used for pressing the pressing block to press the positioning rod into the locking hole when the electromagnet loses magnetism.

Through adopting above-mentioned technical scheme, whether infrared detection device can detect organism tip someone, and capacitance sensor detects skin with another kind of mode, when capacitance sensor and capacitance sensor all signals, controlling means control electro-magnet outage, the compact heap on the locating lever is driven under the spring action of supporting tight spring this moment, it removes towards the locking hole to drive the locating lever, because the locking plate rotates at a high speed, therefore the locating lever can insert rapidly in the locking hole, carry out the locking through radial shear force to the main shaft, can improve the stability of locking when improving the detection precision, be convenient for the locating lever accurately insert in the locking hole and carry out the locking to the main shaft.

In a specific implementation scheme, the outer side wall of the positioning rod is wrapped by a buffer layer for buffering impact, and the bottom of the positioning rod is provided with a guide inclined plane which is convenient to insert into the locking hole.

Through adopting above-mentioned technical scheme, the setting of buffer layer can carry out the buffering of certain degree at the radial shearing force that the locating lever produced when carrying out the locking through the locating lever, and it is too big to have reduced because of the too fast impact that leads to of main shaft rotational speed, and the setting on direction inclined plane then is convenient for the locating lever to insert in the locking hole to be convenient for carry out the locking to the main shaft, improve and insert the degree of accuracy of establishing.

In summary, the present application includes at least one of the following beneficial technical effects:

1. by adopting the technology that the main shaft, the grinding and cutting piece, the protective cover, the extension plate, the sliding groove, the sliding block, the fixing ring pipe, the positioning ring, the locking mechanism, the rotating rod, the extension rod, the locking block, the shifting rod and the shifting block are matched, in the cutting processing or grinding processing process, if the protection area needs to be increased, the extension plate is pulled out of the protective cover, the rotating rod is rotated through the shifting rod and the shifting block, the locking rod is driven to swing along the extension rod, and the parallel swing is carried out along the rotating rod as the circle center, so that the extension plate can swing to the bottom of the locking arc groove along the locking arc groove, and the extension plate and the protective cover are fixed, the protection range of the protective cover is greatly improved, and the safety coefficient in the use process of the angle grinder is improved;

2. by adopting the technology that the closed arc plates, the accommodating grooves, the protective reeds, the driving block, the feeding grooves, the locking mechanism, the rotating shaft, the positioning blocks, the anti-falling blocks, the locking grooves, the positioning tubes, the accommodating tubes, the fixing ropes, the traction arc rod, the locking mechanism, the fixing tubes, the fixing blocks and the shifting pieces are matched, the traction arc rod in the accommodating tube is arranged in each positioning tube along with the fixing ropes in a penetrating manner, each positioning tube can be penetrated through the fixing ropes, and the traction arc rod is fixed on the other closed arc plate, on one hand, the positions of the protective reeds can be reinforced, the positions of the protective reeds are prevented from being deviated, the impact force of the abrasive cutting pieces during crushing is effectively buffered, the crushed abrasive cutting pieces are effectively shielded, and the probability of people injury caused by breakage is reduced; on the other hand, the extending plates on the two sides of the protective cover can be reinforced, so that the position of the extending plate for building the piano deviates, and the probability that the extending plate cannot play a role in protection due to separation from the locking is reduced;

3. through adopting the locking plate, the locking hole, the locating lever, detection mechanism, infrared detection device, capacitive sensor, canceling release mechanical system, support tight spring, the compact heap, the electro-magnet, buffer layer and direction inclined plane matched with technique, when capacitive sensor and capacitive sensor all signals, controlling means control electro-magnet outage, compact heap on the locating lever is driven under the spring action of supporting tight spring this moment, it removes towards the locking hole to drive the locating lever, because the locking plate rotates at a high speed, therefore the locating lever can insert rapidly in the locking hole, carry out the locking through radial shear force to the main shaft, can improve the stability of locking when improving the detection precision, be convenient for the locating lever accurately insert and carry out the locking to the main shaft in the locking hole, reduce the probability that produces the injury to the people.

Drawings

FIG. 1 is a schematic view of the overall structure of an angle grinder in the embodiment of the present application;

FIG. 2 is a schematic view illustrating the structure of the positioning rod and the locking hole in the embodiment of the present application;

FIG. 3 is an enlarged schematic view of the structure at A in FIG. 2;

FIG. 4 is a block diagram showing the control logic of the control device in the embodiment of the present application; a

FIG. 5 is an exploded view of an embodiment of the present application for revealing structures at the shield;

FIG. 6 is a schematic view for showing a locking structure in the embodiment of the present application;

FIG. 7 is a schematic view for showing a structure at a closed arc plate in an embodiment of the present application;

fig. 8 is an enlarged schematic view of the structure at B in fig. 7.

Description of reference numerals: 1. a body; 11. a main shaft; 111. grinding and slicing; 12. a lock plate; 121. a locking hole; 13. positioning a rod; 130. a ring groove; 131. a buffer layer; 132. a guide slope; 133. a compression block; 14. a reset mechanism; 141. the spring is tightly propped; 142. an electromagnet; 15. a detection mechanism; 151. an infrared detection device; 152. a capacitive sensor; 16. a control device; 2. a protective cover; 21. a fixed ring pipe; 22. a sliding groove; 23. an extension plate; 230. positioning rings; 231. a sliding block; 232. a locking arc groove; 233. closing the arc plate; 3. a locking mechanism; 31. rotating the rod; 32. an extension rod; 33. a lock lever; 34. a locking block; 35. a deflector rod; 351. shifting blocks; 4. a housing shell; 41. a protective reed; 411. a drive block; 412. a positioning tube; 42. a fixing mechanism; 421. a rotating shaft; 422. positioning blocks; 423. an anti-drop block; 43. a yielding groove; 431. a locking groove; 5. an accommodating tube; 51. fixing a rope; 511. pulling the arc rod; 6. a locking mechanism; 61. a fixed tube; 62. a fixed block; 63. a shifting sheet.

Detailed Description

The present application is described in further detail below with reference to figures 1-8.

The embodiment of the application discloses an angle grinder. Referring to fig. 1, the angle grinder includes a body 1, a main shaft 11 rotatably connected to the body 1, and a grinding plate 111 mounted on the main shaft 11. The key is connected with a locking plate 12 on the main shaft 11, and the locking plate 12 is a circular ring-shaped block sleeved on the main shaft 11.

Referring to fig. 2 and 3, locking hole 121 has been seted up on locking plate 12, and organism 1 slides on and is connected with locating lever 13, and annular 130 has been seted up to locating lever 13 lateral wall bottom, and the parcel has a buffer layer 131 that is used for the buffering to strike in annular 130, and buffer layer 131 is parallel and level with locating lever 13 lateral wall. The buffer layer 131 may be made of rubber or other flexible materials, and the bottom of the positioning rod 13 is chamfered to form a guide slope 132 so that the positioning rod 13 can be inserted into the locking hole 121.

Referring to fig. 2 and 3, the machine body 1 is provided with a reset mechanism 14 at the top of the positioning rod 13, the reset mechanism 14 includes a support spring 141 arranged on the machine body 1 and an electromagnet 142 arranged on the machine body 1, the support spring 141 is sleeved on the positioning rod 13 and is located above the locking block, and the electromagnet 142 is installed at a position of the machine body 1 above the positioning rod 13 and can adsorb the positioning rod 13 to move upwards. The middle part of the outer side wall of the positioning rod 13 is welded and fixed with the pressing block 133, and the abutting spring 141 can abut against the pressing block 133 when the electromagnet 142 is powered off and loses magnetism, so that the positioning rod 13 is driven to be inserted into the locking hole 121.

Referring to fig. 2 and 4, the body 1 is provided with a detection mechanism 15 for detecting a human body, the detection mechanism 15 includes an infrared detection device 151 for detecting the human body and a capacitance sensor 152 for detecting the human body, the infrared detection device 151 may be a pyroelectric infrared sensor, and the capacitance sensor can sense a skin close to the body, thereby outputting an electrical signal, and the pyroelectric infrared sensor and the capacitance sensor are both installed at an end of the body 1 far from the grip.

Referring to fig. 3 and 4, the detection mechanism 15 is electrically connected to the control device 16, the control device 16 may be a single chip, the control device 16 is electrically connected to the electromagnet 142 in the reset mechanism 14, the electromagnet 142 is powered off after receiving a signal, and the positioning rod 13 is released to be inserted into the locking hole 121, so as to achieve emergency stop locking of the ground slice 111.

Referring to fig. 2 and 5, a protective cover 2 is mounted on the body 1; the protective cover 2 is in a fan shape, the radian can be 120 degrees, and the circle center of the protective cover 2 and the center of the main shaft 11 are on the same straight line. The end face of the protective cover 2 is shaped like a v 21274, the top is fixed on the machine body 1, the edge is integrally formed with an arc plate, and the bottom is integrally formed with a bottom plate.

Referring to fig. 5 and 6, the shield 2 is integrally formed with a fixing collar 21 around the main shaft 11, two extension plates 23 are rotatably connected to the inside of the shield 2 along the fixing collar 21, each extension plate 23 is composed of a top sector area and a side arc area, and the top sector area of the extension plate 23 may be 60 degrees. A positioning ring 230 is integrally formed on one side of the extension plate 23 adjacent to the fixing ring 21, and is disposed on the fixing ring 21, so that the extension plate 23 can rotate along the circumference of the fixing ring 21. The top wall of protection casing 2 inside wall has been seted up and has been slided groove 22, and extension board 23 top integrated into one piece is equipped with the sliding block 231 of inserting and establishing in sliding groove 22 to the restriction extension board 23 rotates along sliding groove 22 length direction.

Referring to fig. 5 and 6, the two ends of the shield 2 are respectively provided with a locking mechanism 3 for positioning the position of the extension plate 23, the locking mechanism 3 includes a rotating rod 31, an extension rod 32, a locking rod 33 and a locking block 34, and the rotating rod 31 is inserted into the side wall of the shield 2 along the radial direction of the shield 2 and can slide relative to the shield 2 along the radial direction of the shield 2. Extension rod 32 integrated into one piece just sets up with dwang 31 mutually perpendicular at the one end of dwang 31, and locking pole 33 integrated into one piece just sets up perpendicularly with extension rod 32 in the one end that dwang 31 was kept away from to extension rod 32 to make locking pole 33 and dwang 31 be parallel to each other, locking piece 34 integrated into one piece is in the tip of locking pole 33.

Referring to fig. 5 and 6, a shift lever 35 is integrally formed at an end of the rotating rod 31 away from the extending rod 32, and the shift lever 35 is perpendicular to the rotating rod 31 and exposed outside the shield 2. The end of the shift lever 35 is integrally formed with a shift block 351 so as to shift the rotating lever 31 to rotate and thus drive the locking lever 33 to translate, thereby being inserted into the locking arc groove 232 to lock the extension plate 23. The two sides of the side wall of the extension plate 23 are both provided with locking arc grooves 232; locking arc groove 232 is located extension 23 curb plate length direction's both ends, and the radian can be 90 degrees, also can be greater than 90 degrees, as long as can carry out the locking to locking lever 33 can.

Referring to fig. 7 and 8, a closed arc plate 233 for covering the bottom of the shield 2 is integrally formed at the bottom end of the extension plate 23, and the radius of the closed arc plate 233 is greater than that of the bottom plate of the shield 2. The outer side wall of the protective cover 2 is integrally formed with a plurality of containing shells 4, the containing shells 4 are internally provided with protection reeds 41, one ends of the protection reeds 41 are fixed in the containing shells 4 through bolts, and the protection reeds 41 are elastic, so that the protection reeds 41 are wound in the containing shells 4. The driving block 411 is welded and fixed on the surface of one side, far away from the spindle 11, of the protection reed 41, the side wall of the containing shell 4 is provided with the abdicating groove 43 for the driving block 411 to slide, and the protection reed 41 can be drawn to the bottom of the grinding and cutting piece 111 by pulling the driving block 411, so that the bottom is shielded.

Referring to fig. 8, a fixing mechanism 42 for locking the position of the protection spring 41 is installed on the driving block 411, the fixing mechanism 42 includes a rotating shaft 421, a positioning block 422 rotatably connected to the rotating shaft 421 and an anti-falling block 423 integrally formed at the end of the rotating shaft 421, the positioning block 422 is sleeved on the rotating shaft 421 and can slide along the length direction of the rotating shaft 421, a locking groove 431 for the positioning block 422 to be inserted into is formed in the accommodating case 4, the locking groove 431 is arranged along the length direction perpendicular to the length direction of the abdicating groove 43, the positioning block 422 is inserted into the locking groove 431 along the length direction of the rotating shaft 421 after rotating to be perpendicular to the length direction of the abdicating groove 43, and the position of the positioning block 422 can be locked.

Referring to fig. 8, the end of the protection reed 41 is welded and fixed with a positioning tube 412, one of the closed arc plates 233 is welded and fixed with a receiving tube 5, a fixing rope 51 is fixed in the receiving tube 5 through a coil spring, one end of the fixing rope 51 is tied with a traction arc rod 511, one end of the fixing rope 51 far away from the traction arc rod 511 is integrally formed with a limiting piece capable of abutting against the end of the inner wall of the receiving tube 5, and the traction arc rod 511 passes through all the positioning tubes 412 and then is fixed on the other closed arc plate 233.

Referring to fig. 7, a locking mechanism 6 for fixing the pulling arc rod 511 is mounted on the other closed arc plate 233, the locking mechanism 6 includes a fixing tube 61 for inserting the pulling arc rod 511, a fixing block 62 in threaded connection with the pulling arc rod 511, and a pair of shifting pieces 63 located on the side wall of the fixing block 62, the fixing tube 61 is welded and fixed on the bottom wall of the outside of the closed arc plate 233, the fixing block 62 abuts against the end wall of the fixing tube 61, and the shifting pieces 63 are integrally formed on the side wall of the fixing block 62, so that the pulling arc rod 511 is conveniently fixed on the closed arc plate 233.

The implementation principle of the angle grinder in the embodiment of the application is as follows:

when the material to be processed needs to be cut, the extension plate 23 is pulled out of the protective cover 2, and the extension plate 23 rotates out of the protective cover 2 by taking the fixing ring pipe 21 as a center. When extension board 23 rotates to level with protection casing 2 end line, rotate shifting block 351, drive dwang 31 and rotate to the swing of drive extension rod 32, and then drive locking lever 33 translation and insert in locking arc groove 232, thereby carry out the locking to the position of extension board 23.

Then, by holding the positioning tube 412 and moving the positioning block 422, the protection reed 41 is pulled out from the housing case 4 against the elastic force of the coil spring, and after the protection reed 41 is pulled to a predetermined position, the positioning block 422 is rotated to a direction perpendicular to the receding groove 43 and inserted into the locking groove 431 along the length direction of the rotating shaft 421. When all the positioning pipes 412 are located on the same arc line, the pulling arc rod 511 in the accommodating pipe 5 on the closed arc plate 233 on one side is pulled out, sequentially penetrates into the positioning pipes 412 and is finally inserted into the fixed pipe 61 to be in threaded connection with the fixed block 62. After the fixing block 62 is in threaded connection with the traction arc rod 511 by the holding and poking piece 63, the fixing block 62 can abut against the end wall of the fixing tube 61, so that the traction arc rod 511 is fixed in the fixing tube 61, the protection range of the protection cover 2 is doubled compared with the original protection range, and the safety factor is greatly improved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. An angle grinder comprises a grinder body (1), wherein a main shaft (11) is rotatably connected to the grinder body (1), and a grinding sheet (111) is arranged on the main shaft (11); the method is characterized in that: the novel multifunctional engine is characterized in that a protective cover (2) is arranged on the engine body (1), the protective cover (2) is fan-shaped, two extending plates (23) are connected to the inner portion of the protective cover (2) in a rotating mode, a sliding groove (22) is formed in the top wall of the inner side wall of the protective cover (2), sliding blocks (231) inserted in the sliding groove (22) are arranged at the tops of the extending plates (23), the protective cover (2) is located on the periphery of a main shaft (11) and is provided with a fixing ring pipe (21), the extending plates (23) are provided with positioning rings (230) sleeved on the fixing ring pipe (21), and locking mechanisms (3) for positioning the extending plates (23) are arranged at the two ends of the protective cover (2) respectively.

2. The angle grinder of claim 1, wherein: locking mechanism (3) including insert dwang (31), the extension rod (32) of connection on dwang (31) of establishing on protection casing (2), set up locking pole (33) on extension rod (32) and be located locking piece (34) of locking pole (33) tip, dwang (31) are radially inserted along protection casing (2) and are established in protection casing (2), extension rod (32) perpendicular to dwang (31), locking pole (33) are perpendicular and extension rod (32) and be on a parallel with dwang (31), the locking arc groove (232) that supply locking pole (33) to insert to establish are all seted up to extension board (23) both sides.

3. The angle grinder of claim 2, wherein: the one end that extension rod (32) were kept away from in dwang (31) is provided with driving lever (35), driving lever (35) tip is provided with shifting block (351) so that stir dwang (31) and rotate thereby drive locking lever (33) translation insert in locking arc groove (232).

4. The angle grinder of claim 3, wherein: extension board (23) bottom is provided with and is used for carrying out the closed arc board (233) that cover to protection casing (2) bottom, be provided with a plurality of containers shell (4) on protection casing (2) lateral wall, it has protection reed (41) to coil in container shell (4), protection reed (41) tip one side is provided with drive block (411), the groove of stepping down (43) that supplies drive block (411) to slide is seted up to container shell (4) lateral wall, be provided with on drive block (411) and carry out fixed establishment (42) of locking to the position of protection reed (41).

5. The angle grinder of claim 4, wherein: fixing mechanism (42) include pivot (421), rotate locating piece (422) of connection on pivot (421) and set up anticreep piece (423) at pivot (421) tip, locating piece (422) cover is established on pivot (421) and can be followed pivot (421) length direction and slide, holding shell (4) are seted up and are supplied locating piece (422) to insert locking groove (431) of establishing, locking groove (431) supply locating piece (422) to insert along pivot (421) length direction and establish.

6. The angle grinder of claim 4, wherein: the end part of the protection reed (41) is provided with a positioning pipe (412), one of the closed arc plates (233) is provided with an accommodating pipe (5), a fixing rope (51) is fixed in the accommodating pipe (5) through a coil spring, one end of the fixing rope (51) is provided with a traction arc rod (511), the traction arc rod (511) penetrates through all the positioning pipes (412) and then is fixed on the other closed arc plate (233), and the other closed arc plate (233) is provided with a locking mechanism (6) for fixing the traction arc rod (511).

7. The angle grinder of claim 6, wherein: the locking mechanism (6) comprises a fixing pipe (61) for inserting the traction arc rod (511), a fixing block (62) in threaded connection with the traction arc rod (511) and a pair of shifting pieces (63) located on the side wall of the fixing block (62), the fixing block (62) is abutted against the end wall of the fixing pipe (61), and a limiting piece for preventing the fixing rope (51) from being separated from the accommodating pipe (5) is arranged at one end, far away from the traction arc rod (511), of the fixing rope (51).

8. The angle grinder of claim 1, wherein: be provided with lock plate (12) on main shaft (11), locking hole (121) have been seted up on lock plate (12), it is connected with locating lever (13) to slide on organism (1), be provided with detection mechanism (15) that detect the human body on organism (1), detection mechanism (15) electricity is connected with controlling means (16), thereby controlling means (16) electricity is connected with canceling release mechanical system (14) in order to insert locating lever (13) release in locking hole (121) and realize the scram locking.

9. The angle grinder of claim 8, wherein: the detection mechanism (15) comprises an infrared detection device (151) for detecting a human body and a capacitance sensor (152) for detecting the human body, the control device (16) controls the reset mechanism (14) to reset when the infrared detection device (151) and the capacitance sensor (152) send signals, the reset mechanism (14) comprises a pressing spring (141) arranged on the machine body (1) and an electromagnet (142) arranged on the machine body (1), the electromagnet (142) is used for adsorbing the positioning rod (13) to move upwards, a pressing block (133) is arranged on the positioning rod (13), and the pressing spring (141) is used for pressing the pressing block (133) to press the positioning rod (13) into the locking hole (121) when the electromagnet (142) loses magnetism.

10. The angle grinder of claim 9, wherein: the outer side wall of the positioning rod (13) is wrapped with a buffer layer (131) used for buffering impact, and a guide inclined plane (132) convenient to insert into the locking hole (121) is arranged at the bottom of the positioning rod (13).