CN110052933B

CN110052933B - Grinding disc assembling and locking system containing glass fiber and angle grinder

Info

Publication number: CN110052933B
Application number: CN201811242889.9A
Authority: CN
Inventors: 弗兰克温特
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-06-05
Filing date: 2018-10-24
Publication date: 2021-04-13
Anticipated expiration: 2038-10-24
Also published as: CN110052933A

Abstract

The invention relates to a grinding sheet assembling and locking system containing glass fiber and an angle grinder, wherein the grinding sheet assembling and locking system is connected to a connecting shaft of the angle grinder; the connecting device comprises a grinding sheet containing glass fiber and a connecting locking piece, wherein a through hole is formed in the middle of the grinding sheet, a connecting hole is formed in the middle of the connecting locking piece, and a screwing part for screwing on the connecting shaft is arranged on the wall of the connecting hole; the connecting locking piece is fixed on the grinding sheet, and the through holes and the connecting holes are coaxially arranged. According to the invention, the connecting locking piece is arranged in the middle of the grinding sheet containing the glass fiber, the grinding sheet can be connected to the connecting shaft in a threaded manner through the connecting locking piece, the connecting locking piece and the grinding sheet on the connecting locking piece are locked on the connecting shaft along with the continuous rotation of the connecting shaft, an additional supporting plate is not needed for supporting the grinding sheet and the connecting locking piece, the total cost of the tool is reduced for a user, and the weight is reduced when the connecting locking piece is used as a handheld tool. Furthermore, by omitting an additional support disc, heat dissipation is improved.

Description

Grinding disc assembling and locking system containing glass fiber and angle grinder

Technical Field

The invention relates to the technical field of angle grinders, in particular to a grinding sheet assembling and locking system containing glass fibers and an angle grinder.

Background

The known grinding disks used in angle grinders are generally fastened directly to the output shaft of the angle grinder or are bolted directly to the latter, which requires a support disk for the grinding disks, since the usual support disks are made of rubber or rubber-like, sufficiently elastic plastic, so that the high wear power in the grinding wheel is associated with the risk of overheating. For this purpose, EP 1741515 a1 describes a support disk as a solution with a large number of cooling channels which serve to cool the grinding wheel from the rear side. Furthermore, a quick-change receptacle for the disks on the carrier disk is described, which comprises a special flange device, which is intended to adhere to the grinding wheel on the side opposite to the grinding wheel on which no grinding medium is provided. The overall structure is relatively complex.

Disclosure of Invention

The invention aims to solve the technical problem of the prior art and provides a grinding sheet assembly locking system containing glass fibers and an angle grinder.

The technical scheme for solving the technical problems is as follows: a grinding plate assembly locking system containing glass fiber is connected to a connecting shaft of an angle grinder; the connecting device comprises a grinding plate containing glass fibers and a connecting locking piece, wherein a through hole is formed in the middle of the grinding plate, a connecting hole is formed in the middle of the connecting locking piece, and a screwing part for screwing on the connecting shaft is arranged on the wall of the connecting hole; the connecting locking piece is fixed on the grinding sheet, and the through holes and the connecting holes are coaxially arranged.

The invention has the beneficial effects that: the grinding sheet assembling and locking system has the advantages that the connecting locking piece is arranged in the middle of the grinding sheet containing glass fibers, the grinding sheet can be in threaded connection with the connecting shaft through the connecting locking piece, the connecting locking piece and the grinding sheet on the connecting locking piece are locked on the connecting shaft along with the continuous rotation of the connecting shaft, the grinding sheet and the connecting locking piece are not required to be supported by an additional supporting disc, the total cost of a tool is reduced for a user, and the weight is reduced when the grinding sheet assembling and locking system is used as a handheld tool. Furthermore, by omitting an additional support disc, heat dissipation is improved.

On the basis of the technical scheme, the invention can be further improved as follows.

Further, the portion of connecting soon does an annular sunk structure that forms is sunken all around to the connecting hole, a breach has been seted up to annular sunk structure's bottom, one of them lateral wall of breach to the sunken direction of connecting hole extends and forms a spiral screens extension body, spiral screens extension body with form between another lateral wall of breach and be used for the joint threaded screens space on the connecting axle.

The beneficial effect of adopting the further scheme is that: the rotary connection part is arranged to be an annular concave structure around the connection hole, and the notch is provided with the spiral clamping extension body, so that the rotary connection part is conveniently connected with the output upper thread of the angle grinder.

Further, annular sunk structure includes that the body coupling is perhaps dismantled and is connected connect an annular section of thick bamboo and a body coupling at the connecting retaining member middle part at the annular end on the annular section of thick bamboo one end inside wall, the breach is seted up the interior at the annular end circles and extends to on the annular section of thick bamboo.

The beneficial effect of adopting the further scheme is that: the output shaft of the angle grinder is sleeved in the annular cylinder in an annular cylinder mode, and the whole structure is more stable and reliable.

Further, the annular cylinder is a cylinder or a trapezoid cylinder, and the annular bottom is arranged at the small opening end of the trapezoid cylinder.

The beneficial effect of adopting the further scheme is that: and a cylindrical or trapezoidal cylinder structure is adopted, so that the connection and the positioning are more stable and reliable.

Further, the joint of the annular bottom and the annular cylinder is rounded.

The beneficial effect of adopting the further scheme is that: the fillet at the joint of the annular bottom and the annular cylinder is arranged, so that the hand feeling is good, and the molding of a mold is convenient.

Further, the inner ring of the annular bottom extends to the direction close to the grinding plate to form a convex edge.

The beneficial effect of adopting the further scheme is that: the inner ring of the annular bottom extends to form a convex edge, so that the inner ring of the annular bottom is hidden, and the cutting injury to workers in the installation process is avoided.

Further, the annular recessed structure is of an annular cylindrical structure, the surface of the annular cylindrical structure is a spherical surface, the large opening end of the annular cylindrical structure is integrally connected to the connecting locking piece, the connecting hole is located at the small opening end of the annular cylindrical structure, and the notch is formed in the hole wall of the connecting hole.

The beneficial effect of adopting the further scheme is that: the surface of the ring-shaped structure is set to be a spherical surface, so that the supporting force of the ring-shaped structure to the whole grinding disc is more uniform and reliable.

Furthermore, the periphery of the connecting locking piece is embedded in the grinding sheet.

The beneficial effect of adopting the further scheme is that: the periphery of the connecting locking piece is embedded in the grinding sheet, the whole locking system is integrally arranged, and the whole structure is more stable and firm.

Further, the annular concave structure connected with the middle part of the locking piece is inserted into the through hole in the middle part of the grinding sheet and is fixed on the grinding sheet.

The beneficial effect of adopting the further scheme is that: the annular sunken structure that will connect retaining member middle part inserts in the through-hole at abrasive disc middle part and fixes on the abrasive disc, makes and connects retaining member middle part and run through the abrasive disc setting, and overall structure is more reliable and more stable.

Further, the connecting and locking piece is an annular structural piece which is integrally connected or detachably connected or embedded on either side surface of the grinding sheet.

The beneficial effect of adopting the further scheme is that: the mounting position of the connecting locking piece can be selected at will according to the requirements.

Furthermore, the connecting and locking pieces are two annular structural pieces which are respectively integrally connected or detachably connected or embedded on the two side surfaces of the grinding sheet, and the rotary connection parts on the two annular structural pieces are simultaneously positioned on the inner side of the through hole or simultaneously positioned on the outer side of the through hole or respectively positioned on the inner side and the outer side of the through hole.

The beneficial effect of adopting the further scheme is that: through limiting the position of the rotary part on the annular structural part, the grinding plates with different connecting structures can be selected according to requirements, connecting strength and the like.

Furthermore, the clamping spaces formed on the two annular structural members are respectively matched with two different thread structures.

The beneficial effect of adopting the further scheme is that: the two annular structural members are respectively matched with different thread structures, so that the requirements of different angle grinder connecting shafts can be met.

Furthermore, the screens space is with predetermineeing the metric system size or the english system size of screw thread fit.

The beneficial effect of adopting the further scheme is that: the clamping space is set to be selectable metric size or English size, and the installation configuration requirements of different countries can be met.

The utility model provides an angle grinder, includes driving-disc, connecting axle, visor and foretell abrasive disc assembly locking system, the coaxial fixing of connecting axle one end is in driving-disc central point puts the department, it connects the retaining member to connect the spiral shell to connect on the connecting axle, the cover is equipped with a gasket on the connecting axle, the gasket is located connect the retaining member with between the driving-disc, the visor is installed on the driving-disc and will connect the retaining member with the abrasive disc cover is established.

The invention has the beneficial effects that: according to the angle grinder, the connecting locking piece is arranged in the middle of the grinding sheet containing the glass fiber, the grinding sheet can be connected to the connecting shaft in a threaded mode through the connecting locking piece, the connecting locking piece and the grinding sheet on the connecting locking piece are locked on the connecting shaft along with continuous rotation of the connecting shaft, an additional supporting plate is not needed for supporting the grinding sheet and the connecting locking piece, the total cost of tools is reduced for users, and the weight is reduced when the angle grinder is used as a handheld tool. Furthermore, by omitting an additional support disc, heat dissipation is improved.

Drawings

FIG. 1 is a schematic perspective view of one embodiment of a refiner plate containing glass fibers according to the present invention;

FIG. 2 is a cross-sectional structural schematic view of another embodiment of a glass fiber containing refiner plate of the present invention;

FIG. 3 is a schematic structural view of the angle grinder of the present invention;

FIG. 4 is a cross-sectional view of a first embodiment of the two connecting locks of the present invention;

FIG. 5 is a schematic cross-sectional view of a second embodiment of the two connecting locking members of the present invention;

FIG. 6 is a schematic cross-sectional view of a third embodiment of the present invention;

FIG. 7 is a cross-sectional structural view of a fourth arrangement of two connecting locking members of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. grinding; 2. connecting a locking piece; 21. connecting holes; 22. a screwing part; 23. a notch; 24. a screw retaining extension body; 25. a clamping space; 26. an annular base; 27. a convex edge; 28. a gasket; 29. a connecting ring; 3. a drive disc; 4. a connecting shaft; 5. a protective cover.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth to illustrate, but are not to be construed to limit the scope of the invention.

Example 1

As shown in FIGS. 1 and 2, a refiner plate assembly locking system containing glass fiber of the present embodiment is connected to a connecting shaft 4 of an angle grinder; the grinding plate comprises a grinding plate 1 containing glass fiber and a connecting and locking piece 2, wherein a through hole is formed in the middle of the grinding plate 1, a connecting hole 21 is formed in the middle of the connecting and locking piece 2, and a screwing part 22 for screwing on the connecting shaft 4 is arranged on the wall of the connecting hole 21; the connecting locking piece 2 is fixed on the grinding plate 1, and the through holes and the connecting holes 21 are coaxially arranged. The grinding sheet of the embodiment mainly adopts a grinding sheet containing glass fibers, the glass fibers are inorganic nonmetallic materials with excellent performance and are various, the grinding sheet has the advantages of good insulativity, strong heat resistance, good corrosion resistance and high mechanical strength, the grinding sheet is manufactured by taking glass balls or waste glass as raw materials through processes of high-temperature melting, wire drawing, winding, weaving and the like, the diameter of each monofilament is several micrometers to twenty micrometers, the diameter is equivalent to 1/20-1/5 of one hair, and each fiber strand is composed of hundreds of monofilaments and even thousands of monofilaments. Glass fibers are commonly used as reinforcing materials in composite materials, electrical and thermal insulation materials, circuit substrates, and other various fields of the national economy. Adopt the abrasive disc cooperation that contains glass fiber to connect the retaining member, need not the supporting disk and can connect the abrasive disc on the connecting axle of angle grinder, contain glass fiber's abrasive disc moreover and can firmly be connected with connecting the retaining member, it is higher to polish efficiency.

Wherein, the connecting locking piece 2 can be made of any metal material.

The grinding sheet assembly locking system of this embodiment, through at the grinding sheet mid-mounting of containing glass fiber connect the retaining member, can be through connecting retaining member with grinding sheet threaded connection on the connecting axle, will connect the retaining member and the grinding sheet locking on it is on the connecting axle along with the connecting axle lasts to rotate, do not need extra supporting disk to support the grinding sheet and connect the retaining member, for the user has reduced the instrument total cost to still reduced weight when using as handheld tool. Furthermore, by omitting an additional support disc, heat dissipation is improved.

As shown in fig. 1 and fig. 2, the rotation portion 22 of this embodiment is an annular recessed structure formed by the recess around the connection hole 21, a notch 23 is opened at the bottom of the annular recessed structure, one of the sidewalls of the notch 23 extends toward the recess of the connection hole 21 to form a screw position-locking extension body 24, and a position-locking space 25 for locking the threads on the connection shaft 4 is formed between the screw position-locking extension body 24 and the other sidewall of the notch 23. The rotary connection part is arranged to be an annular concave structure around the connection hole, and the notch is provided with the spiral clamping extension body, so that the rotary connection part is conveniently connected with the output upper thread of the angle grinder.

As shown in fig. 1 and fig. 2, the annular recessed structure of the present embodiment includes an annular cylinder integrally connected to the middle portion of the connecting locking member 2 and an annular bottom 26 integrally connected to the inner side wall of one end of the annular cylinder, and the notch 23 is opened on the inner ring of the annular bottom 26 and extends to the annular cylinder. The output shaft of the angle grinder is sleeved in the annular cylinder in an annular cylinder mode, and the whole structure is more stable and reliable.

The outer side wall of the annular cylinder is integrally provided with a circle of connecting ring 29, when the rotary connection part 22 and the grinding plate are fixed, the annular cylinder and the through hole of the grinding plate can be coaxially arranged, and then the connecting ring is fixed on the peripheral side wall of the through hole on the grinding plate.

As shown in fig. 1, the annular cylinder of this embodiment is a cylinder or a trapezoid cylinder, and the annular bottom 26 is disposed at a small opening end of the trapezoid cylinder. And a cylindrical or trapezoidal cylinder structure is adopted, so that the connection and the positioning are more stable and reliable.

The junction of the annular base 26 and the annular canister of this embodiment is rounded. The fillet at the joint of the annular bottom and the annular cylinder is arranged, so that the hand feeling is good, and the molding of a mold is convenient.

As shown in fig. 2, the inner ring of the annular bottom 26 of the present embodiment extends in a direction approaching the grinding plate 1 to form a convex edge 27. The inner ring of the annular bottom extends to form a convex edge, so that the inner ring of the annular bottom is hidden, and the cutting injury to workers in the installation process is avoided.

Another embodiment of this embodiment, annular recessed structure is ring tubular structure, ring tubular structure's surface is the sphere, ring tubular structure's macrostoma end an organic whole is connected connect retaining member 2 is last, connecting hole 21 is located ring tubular structure's osculum end, breach 23 is seted up on the pore wall of connecting hole 21. The surface of the ring-shaped structure is set to be a spherical surface, so that the supporting force of the ring-shaped structure to the whole grinding disc is more uniform and reliable.

In fact, regardless of the shape of the annular recessed structure, an annular bottom 26 is formed at the position of the connection hole of the annular recessed structure to extend inward, so that the screw position retaining extension and the notch side wall form a retaining space 25 therebetween.

Furthermore, the locking space 25 of the present embodiment only needs to be locked with one pitch to achieve the locking of the whole connecting locking member on the connecting shaft and the locking of the connecting locking member to the end of the connecting shaft along the thread.

In this embodiment, the connection manner of the connecting locking member 2 and the grinding plate 1 may be that the periphery of the connecting locking member 2 is embedded in the grinding plate 1 or directly fixed on the side surface around the grinding plate through hole. The periphery of the connecting locking piece is embedded in the grinding sheet, the whole locking system is integrally arranged, and the whole structure is more stable and firm.

In this embodiment, the connecting locking member 2 and the grinding plate 1 may be connected in such a manner that the annular concave structure at the middle portion of the connecting locking member 2 is inserted into the through hole at the middle portion of the grinding plate 1 and fixed to the grinding plate 1. The annular sunken structure that will connect retaining member middle part inserts in the through-hole at abrasive disc middle part and fixes on the abrasive disc, makes and connects retaining member middle part and run through the abrasive disc setting, and overall structure is more reliable and more stable.

An optional technical solution of this embodiment is that the connecting and locking member 2 is an annular structural member integrally connected or detachably connected or embedded on either side of the grinding plate 1.

Another optional technical solution of this embodiment is that the connecting and locking member 2 is two annular structural members integrally connected or detachably connected or embedded on two side surfaces of the grinding plate 1, and the screwing portions 22 on the two annular structural members are located on the inner side of the through hole or on the outer side of the through hole at the same time or on the inner side and the outer side of the through hole respectively. As shown in fig. 4-7, in fig. 4, the two screwing portions 22 for connecting the locking member 2 are respectively located at the outer sides of the through holes; in fig. 5, the two screwing parts 22 of the connecting locking piece 2 are respectively positioned at the inner sides of the through holes; in fig. 6 and 7, the two screw-on portions 22 of the connecting retaining member 2 are respectively located inside and outside the through hole.

Wherein, the portion 22 that connects soon does the sunken annular sunk structure that forms all around of connecting hole 21, a breach 23 has been seted up to annular sunk structure's bottom, one of them lateral wall of breach 23 to the sunken direction of connecting hole 21 extends and forms a spiral screens extension body 24, spiral screens extension body 24 with form between another lateral wall of breach 23 and be used for the joint threaded screens space 25 on the connecting axle 4.

In addition, the clamping spaces 25 formed on the two annular structural parts are respectively matched with two different thread structures. The two annular structural members are respectively matched with different thread structures, so that the requirements of different angle grinder connecting shafts can be met. In fact, the locking space 25 of one of the annular structures is several times larger than the locking space 25 of the other annular structure, for example, when the first annular structure is locked with a thread having a pitch a, the second annular structure can be locked with a thread having a pitch B, which is several times the pitch a.

In this embodiment, the locking space 25 is a metric size or an imperial size matched with a preset thread, such as M14, M10,5/8-11 …, and the locking space is set to be a selectable metric size or an imperial size, so that the requirements of installation and configuration in different countries can be met.

The abrasive disc assembly locking system of this embodiment when using, directly will connect the connecting hole cover in the middle of the retaining member and establish on the connecting axle to through screens space and the epaxial screw thread adaptation of connecting and be connected, when the connecting axle rotates along with the angle mill drive, the direction of the screw in connecting axle of connecting the retaining member is exactly the same with the rotation direction of connecting axle, and along with the rotation of connecting axle, it is tight more soon more to connect the retaining member on the connecting axle like this, prevents to connect droing of retaining member.

Example 2

As shown in fig. 3, the angle grinder of this embodiment includes a driving disc 3, a connecting shaft 4, a protection cover 5 and the above-mentioned grinding sheet assembling and locking system, one end of the connecting shaft 4 is coaxially fixed at the central position of the driving disc 3, the connecting locking member 2 is screwed on the connecting shaft 4, a spacer 28 is sleeved on the connecting shaft 4, the spacer 28 is located between the connecting locking member 2 and the driving disc 3, and the protection cover 5 is installed on the driving disc 3 and covers the connecting locking member 2 and the grinding sheet 1. The angle grinder of this embodiment, through at the blade middle part installation one that contains glass fiber and connect the retaining member, can be through connecting retaining member with blade threaded connection on the connecting axle, along with the connecting axle is continuous to be rotated and will be connected the retaining member and the blade locking on it is on the connecting axle, need not extra supporting disk and support the blade and connect the retaining member, for the user has reduced the instrument total cost to still reduced weight when using as handheld instrument. Furthermore, by omitting an additional support disc, heat dissipation is improved.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A grinding plate assembly locking system containing glass fiber is connected to a connecting shaft of an angle grinder; the device is characterized by comprising a grinding plate containing glass fiber and a connecting locking piece, wherein a through hole is formed in the middle of the grinding plate, a connecting hole is formed in the middle of the connecting locking piece, and a screwing part for screwing on the connecting shaft is arranged on the wall of the connecting hole; the connecting locking piece is integrally connected or detachably connected or embedded on the grinding sheet, and the through holes and the connecting holes are coaxially arranged;

connect soon portion do an annular sunk structure that forms is sunken all around to the connecting hole, a breach has been seted up to annular sunk structure's bottom, one of them lateral wall of breach to the sunken direction of connecting hole is extended and is formed a spiral screens extension body, spiral screens extension body with form between another lateral wall of breach and be used for the joint threaded screens space on the connecting axle.

2. The fiberglass-containing grinding plate assembly locking system according to claim 1, wherein the annular recess structure comprises an annular cylinder integrally or detachably connected to a middle portion of the connecting locking member and an annular bottom integrally connected to an inner side wall of one end of the annular cylinder, and the notch is opened on an inner ring of the annular bottom and extends to the annular cylinder.

3. A fiberglass-containing refiner plate fitting locking system according to claim 2, wherein the annular cylinder is a cylinder or a trapezoidal cylinder, and the annular base is provided at a small mouth end of the trapezoidal cylinder.

4. A fiberglass containing refiner plate assembly locking system according to claim 3 wherein the junction of the annular base and the annular barrel is rounded.

5. A fiberglass containing refiner plate assembly locking system according to claim 2, wherein the inner ring of the annular base extends in a direction toward the refiner plate to form a lip.

6. The fiberglass-containing grinding plate assembling and locking system according to claim 1, wherein the annular recessed structure is a ring-shaped cylindrical structure, the surface of the ring-shaped cylindrical structure is a spherical surface, the large opening end of the ring-shaped cylindrical structure is integrally connected to the connecting and locking member, the connecting hole is located at the small opening end of the ring-shaped cylindrical structure, and the notch is formed in the hole wall of the connecting hole.

7. A fibreglass containing blade assembly locking system as claimed in any one of claims 1 to 6 wherein the attachment locking member is embedded within the blade at its periphery.

8. The fitting and locking system of grinding plates containing glass fiber according to any one of claims 1 to 6, characterized in that the annular concave structure connecting the middle part of the locking member is inserted into the through hole of the middle part of the grinding plate and fixed to the grinding plate.

9. A fiberglass containing abrasive sheet assembly locking system as claimed in claim 1, wherein said connecting locking member is an annular structural member integrally attached or removably attached or embedded on either side of said abrasive sheet.

10. The fiberglass-containing grinding plate assembly locking system according to claim 1, wherein the connecting and locking member is two annular structural members integrally connected or detachably connected or embedded on both sides of the grinding plate, and the screwing parts on the two annular structural members are positioned on the inner side of the through hole or on the outer side of the through hole or on the inner side and the outer side of the through hole.

11. The system of claim 10, wherein the rotation connection portion is an annular recess formed by recessing the periphery of the connection hole, a notch is formed in the bottom of the annular recess, one side wall of the notch extends in the direction of the recess of the connection hole to form a screw retaining extension body, and a retaining space for retaining a thread on the connection shaft is formed between the screw retaining extension body and the other side wall of the notch.

12. A fiberglass containing abrasive disc assembly locking system as set forth in claim 11 wherein the detent spaces defined on both of said annular structural members are adapted to accommodate two different thread configurations, respectively.

13. A fiberglass containing abrasive disc assembly locking system as claimed in claim 1 or 11, wherein said detent space is of metric or english dimensions to mate with a predetermined thread.

14. An angle grinder, comprising a driving disc, a connecting shaft, a protective cover and a grinding disc assembling and locking system as claimed in any one of claims 1 to 13, wherein one end of the connecting shaft is coaxially fixed at the center of the driving disc, the connecting locking member is screwed on the connecting shaft, a spacer is sleeved on the connecting shaft, the spacer is positioned between the connecting locking member and the driving disc, and the protective cover is installed on the driving disc and covers the connecting locking member and the grinding disc.