Grinding disc

Abstract

The utility model relates to an abrasive disc which comprises a tray and abrasive cloth, the abrasive cloth comprises a plurality of abrasive discs, the tray comprises a connecting part and a mounting part connected with the connecting part, the connecting part is provided with a connecting hole for a shaft driving the tray to rotate to penetrate through, and the abrasive discs are arranged on the inner side close to the center line of the connecting hole and the outer side far away from the center line of the connecting hole. The mounting part is located on the outer side of the connecting part, and the abrasive discs are sequentially bonded to the mounting part in the circumferential direction of the mounting part; a bonding surface for bonding abrasive cloth is formed on the end surface of the mounting part, an annular groove capable of accommodating an adhesive is formed in the bonding surface, and the outer wall surface of the annular groove is inclined downwards from inside to outside to form an inclined surface when the bonding surface faces downwards. In the process of adhering the abrasive cloth to the mounting part, the abrasive cloth can extrude the adhesive in the annular groove, so that the adhesive permeates between the abrasive sheets of the abrasive cloth, and the abrasive sheets are firmly adhered together.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of grinding and polishing and surface treatment in operation transportation part, and specifically relates to a grinding disc, which is suitable for polishing or polishing metal and nonmetal surface. BACKGROUND

[0002] The grinding disc is widely used in the processing of industrial production products and mainly plays the role of polishing, and is used in large-scale automobile, ship and aviation manufacturing and small-scale polishing of jade, heels, stainless steel product manufacturing and furniture manufacturing.

[0003] The grinding disc of the existing grinding and polishing tool is generally fixed on the base by polishing cloth in the form of glue or plastic hasp, and the existing grinding disc is shown in the Chinese patent application No. CN200810163675.2 (publication No. CN101480788A) "Grinding disc and preparation method thereof", which comprises a tray and polishing cloth, the tray comprises a connecting part with a middle arch and a mounting part at the periphery, the polishing cloth is bonded to the mounting part, the inner side of the tray between the connecting part and the mounting part is provided with an annular rib, and the root of the polishing cloth is arranged around the outer side of the rib, and the feature is that the rib end and the root of the polishing cloth have a glue supplementing position.

[0004] It can be known from the patent that after the sand cloth is installed on the mounting part, glue supplementing is needed to firmly connect the sand cloth and the tray, and there are two glue supplementing methods, one of which is to apply glue between the root of the polishing cloth and the end of the rib for glue supplementing, and the other of which is to apply glue not only between the root of the polishing cloth and the end of the rib but also on the back of the elongated part of the polishing cloth.

[0005] Therefore, the current grinding disc needs to be glued again after the sand cloth is bonded to the mounting part in order to firmly bond the sand cloth to the tray, which is troublesome. UTILITY MODEL CONTENTS

[0006] The utility model solves the technical problem of the prior art and provides a grinding disc, which does not need to be glued again after the sand cloth is bonded to the mounting part and can firmly install the sand cloth on the tray.

[0007] The utility model adopts the technical scheme that a grinding disc comprises a tray and sand cloth, the sand cloth comprises a plurality of sand pieces, the tray comprises a connecting part and a mounting part connected with the connecting part, the connecting part is provided with a connecting hole for the shaft driving the tray to pass through, the inner side is close to the center line of the connecting hole, and the outer side is away from the center line of the connecting hole, the mounting part is located on the outer side of the connecting part, and the plurality of sand pieces are sequentially bonded to the mounting part along the circumference of the mounting part.

[0008] The end surface of the mounting portion forms an adhesive surface for adhering the abrasive cloth, and the adhesive surface has an annular groove capable of accommodating adhesive, and the outer wall surface of the annular groove is inclined downward from inside to outside to form an inclined surface in a state where the adhesive surface faces downward.

[0009] In the above scheme, the annular groove is located between the inner side and the outer side of the abrasive cloth, and the adhesive in the annular groove can flow inward and outward under extrusion, thereby improving the connection stability of the abrasive cloth and the tray.

[0010] Preferably, the mounting portion has a first part and a second part from inside to outside along the radial direction of the connecting hole, the thickness of the first part is greater than the thickness of the second part, and the annular groove is arranged on the second part. The arrangement of the annular groove not only can be used to accommodate the adhesive, but also can make the thickness of the second part thinner, i.e., the thickness of the mounting portion is thinner from inside to outside, so that the abrasive disc has good heat dissipation, and the selection of the adhesive is also greatly increased. The existing adhesive that will turn black under heat can also be used for the abrasive disc. In addition, the abrasive disc has the structure, so that the mounting portion has a certain elasticity, so that the abrasive disc has a good hand feeling when used, and the user will not have a hard feeling. In addition, the mounting portion has a certain elasticity, so that the abrasive disc has better wrapping performance. For example, for an irregularly shaped object or a polishing surface that is not flat, the elasticity of the mounting portion enables the abrasive disc to better wrap the polishing surface, so as to better polish the object. In addition, the elastic mounting portion also makes the abrasive cloth have a certain flexibility, so that the debris clamped between the abrasive discs is easily removed, and will not turn black or affect the grinding effect.

[0011] In order to improve the grinding range of the abrasive cloth and make the abrasive cloth have a certain elasticity during grinding, the abrasive cloth partially extends beyond the outer edge of the mounting portion.

[0012] Preferably, a plurality of abrasive discs are sequentially stacked along the circumferential direction of the mounting portion, the abrasive discs are arranged to be inclined along the circumferential direction of the tray, and the outer edges of the abrasive discs are located on the outer side of the mounting portion. In this way, the abrasive discs are well positioned relative to each other and are not easy to come off.

[0013] In the above scheme, the connecting portion is in the shape of a circular truncated cone, including a flat portion and a conical body extending from the circumferential edge of the flat portion, the connecting hole is arranged on the flat portion, and the mounting portion is in the shape of a ring and is connected to the end of the conical body through a ring body.

[0014] Preferably, the end surface of the ring body opposite to the adhesive surface is inclined, so as to form a groove between the ring body and the connecting portion, thereby reducing the material and the cost, and also ensuring the strength of the abrasive disc.

[0015] Preferably, the outer edge of the end surface of the mounting portion opposite to the adhesive surface is inclined toward the direction of the adhesive surface from inside to outside, so that the abrasive disc can extend into a smaller space to polish the surface to be ground, and the use scenarios are wide.

[0016] Compared with the prior art, the utility model discloses the advantages that: the utility model discloses the annular groove on the bonding surface of installation part is provided, the annular groove can accommodate more adhesive, and the outer wall surface of annular groove is inclined surface, and adhesive flows out conveniently, in the process that the abrasive cloth is pasted on the installation part, the adhesive in the annular groove is extruded by abrasive cloth and makes adhesive penetrate between the abrasive sheet of abrasive cloth, so that the abrasive sheet is firmly adhered together, in addition, because the number of adhesive that can be accommodated in the annular groove is more, adhesive can seep from the polishing surface of abrasive cloth, namely after setting up annular groove, it is favorable to the outward flow of redundant adhesive and realizes back gluing.

[0017] The abrasive sheet of the utility model discloses does not need mould, does not need secondary glue supplement and back gluing, reduces the procedure, greatly reduces the amount of glue, and is favorable to reducing cost. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the structure schematic diagram of abrasive sheet of the utility model embodiment;

[0019] Figure 2 It is another direction structure schematic diagram of Figure 1 ;

[0020] Figure 3 It is the sectional view of Figure 1 ;

[0021] Figure 4 It is the structure schematic diagram of tray in Figure 1 ;

[0022] Figure 5 It is the sectional view of Figure 4 . DETAILED DESCRIPTION

[0023] The utility model technical scheme is further described in detail below in combination with the embodiment of the drawings, and obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiment, and all other embodiments obtained by the person skilled in the art without creative labor based on the embodiment in the utility model belong to the scope of protection of the utility model.

[0024] In the description of the utility model, it is understood that, in the description of the utility model patent, unless otherwise specified, "multiple" means two or more, and the terms "upper", "lower", "left", "right", "top", "bottom", "front", "back" and the like indicate the orientation or positional relationship based on the direction or positional relationship shown in the drawings, and are only for the convenience of describing the utility model patent and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, a particular orientation and operation, therefore, cannot be understood as limiting the utility model patent.

[0025] In the description of this utility model patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an adhesive connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model patent based on the specific circumstances.

[0026] like Figures 1 to 5 As shown, the grinding disc of this preferred embodiment includes a tray 1 and a sanding cloth 2. The tray 1 includes a connecting part 11 and a mounting part 12 connected to the connecting part 11. The connecting part 11 is provided with a connecting hole 111 through which a shaft that drives the tray 1 to rotate passes, with the inner side being closer to the center line of the connecting hole 111 and the outer side being farther away from the center line of the connecting hole 111. The mounting part 12 is located on the outer side of the connecting part 11.

[0027] In this embodiment, the connecting portion 11 is frustum-shaped, including a flat portion 112 and a conical body 113 extending obliquely from the periphery of the flat portion 112. A connecting hole 111 is provided on the flat portion 112. The mounting portion 12 is annular and connected to the end of the conical body 113 via the annular body 13. Preferably, the end face of the annular body 13 facing away from the bonding surface 121 is obliquely arranged, thereby forming a groove 131 between the annular body 13 and the connecting portion 11 to reduce material and lower costs, while also ensuring the strength of the grinding disc.

[0028] The abrasive cloth 2 includes multiple abrasive sheets 21, which are bonded to the mounting part 12. The abrasive sheets 21 are inclined around the tray 1, and the multiple abrasive sheets 21 are stacked sequentially around the mounting part 12. This ensures good positioning between the abrasive sheets 21 and prevents them from easily detaching.

[0029] The outer edge of each abrasive disc 21 is located outside the mounting portion 12, so that the abrasive cloth 2 extends partially beyond the outer edge of the mounting portion 12. This allows the abrasive cloth 2 to have a large grinding range and, during grinding, has a certain degree of elasticity, resulting in good coverage of the surface to be ground.

[0030] The above are existing technologies and will not be elaborated further.

[0031] The end surface of the mounting portion 12 forms an adhesive surface 121 for adhering the abrasive cloth 2, and the adhesive surface 121 has an annular groove 122 capable of accommodating adhesive. In the state that the adhesive surface 121 faces downward, the outer wall surface of the annular groove 122 is inclined downward from inside to outside to form an inclined surface 1221, and the annular groove 122 is located between the inner side edge and the outer side edge of the abrasive cloth 2. The injection amount of the adhesive needs to meet the condition that the adhesive can flow out of the annular groove 122 and seep between the abrasive grains 21 of the abrasive cloth 2 when the abrasive cloth 2 is pressed; in other words, the abrasive cloth 2 will press the adhesive to make the adhesive flow out of the annular groove 122, so that the adhesive in the annular groove 122 can flow inward and outward to achieve the adhesion between the abrasive cloth 2 and the mounting portion 12, and the adhesive can seep between the abrasive grains 21 of the abrasive cloth 2 to make the abrasive grains 21 firmly adhere together.

[0032] Meanwhile, after the abrasive cloth 2 is adhered to the mounting portion 12, the abrasive cloth is in the state that the adhesive surface 121 faces downward, and the adhesive will flow along the inclined surface 1221 under the action of gravity and continue to seep between the abrasive grains 21, because the annular groove 122 can accommodate more adhesive, the adhesive can seep out from the polishing surface of the abrasive cloth 2.

[0033] In addition, the outer edge of the end surface of the mounting portion 12 opposite to the adhesive surface 121 is inclined toward the adhesive surface 121 from inside to outside, so that the abrasive cloth can extend into a smaller space to polish the surface to be ground.

[0034] In addition, in the embodiment, the mounting portion 12 has a first portion 1211 and a second portion 1212 in sequence from inside to outside along the radial direction of the connecting hole 111, the thickness of the first portion 1211 is greater than the thickness of the second portion 1212, and the annular groove 122 is arranged on the second portion 1212. The arrangement of the annular groove 122 not only can accommodate adhesive, but also makes the thickness of the second portion 1212 thinner, that is, the thickness of the mounting portion 12 becomes thinner from inside to outside, so that the abrasive cloth has good heat dissipation, and the selection of the adhesive is also much larger, and the existing adhesive that will turn black after being heated can also be used for the abrasive cloth; in addition, this structure of the abrasive cloth makes the mounting portion 12 have a certain elasticity, so that the abrasive cloth has a better hand feeling when used, and the user will not have a hard feeling; and the elasticity of the mounting portion 12 also makes the abrasive cloth have better wrapping performance, for example, for an object to be polished with irregular shape or non-planar polishing surface, the elasticity of the mounting portion 12 makes the abrasive cloth better wrap the polishing surface to better polish the object; in addition, the mounting portion 12 with elasticity also makes the abrasive cloth have a certain flexibility, and the debris clamped between the abrasive grains 21 is easy to be removed, and will not turn black or affect the grinding effect.

[0035] In this embodiment, the adhesive can be epoxy resin, the working temperature is 80°-120°, the adhesive can also be phenolic resin, the working temperature is 170°-180°, the gluing can be used gluing machine, can be used slicer to stick the sand cloth 2 on the installation part 12, the sand cloth 2 is stuck on the tray 1, can be cured in the oven or in the air under natural conditions.

Claims

1. A grinding sheet comprising a tray (1) and a sand cloth (2), the sand cloth (2) comprising a plurality of sand sheets (21), the tray (1) comprising a connecting portion (11) and a mounting portion (12) connected with the connecting portion (11), the connecting portion (11) being provided with a connecting hole (111) for passing a shaft for driving the tray (1) to rotate, the connecting hole (111) having an inner side close to a center line of the connecting hole (111) and an outer side away from the center line of the connecting hole (111), the mounting portion (12) being located at the outer side of the connecting portion (11), and the plurality of sand sheets (21) being sequentially adhered to the mounting portion (12) in a circumferential direction of the mounting portion (12). characterized in that An end surface of the mounting portion (12) forms an adhering surface (121) for adhering the sand cloth (2), the adhering surface (121) being provided with an annular groove (122) capable of accommodating an adhesive, and an outer wall surface of the annular groove (122) being inclined downward from inside to outside to form an inclined surface (1221) in a state that the adhering surface (121) faces downward.

2. The abrasive sheet of claim 1, wherein: The annular groove (122) is located between an inner side edge and an outer side edge of the sand cloth (2).

3. The abrasive sheet of claim 1, wherein: The mounting portion (12) sequentially comprises a first portion (1211) and a second portion (1212) from inside to outside in a radial direction of the connecting hole (111), the first portion (1211) having a thickness greater than that of the second portion (1212), and the annular groove (122) being arranged on the second portion (1212).

4. The abrasive sheet of any of claims 1-3, wherein: The sand cloth (2) partially extends beyond an outer edge of the mounting portion (12).

5. The abrasive sheet of claim 4, wherein: The plurality of sand sheets (21) are sequentially stacked in the circumferential direction of the mounting portion (12), and the sand sheets (21) are arranged in a tilted manner in the circumferential direction of the tray (1), and an outer edge of each sand sheet (21) is located at the outer side of the mounting portion (12).

6. The abrasive sheet of any of claims 1-3, wherein: The connecting portion (11) is in a shape of a circular truncated cone, comprising a planar portion (112) and a conical body (113) extending from a circumferential edge of the planar portion (112), the connecting hole (111) being arranged on the planar portion (112), and the mounting portion (12) being in a ring shape and connected with an end portion of the conical body (113) through a ring body (13).

7. The abrasive sheet of claim 6, wherein: An end surface of the ring body (13) opposite to the adhering surface (121) is arranged in an inclined manner, so as to form a groove (131) between the ring body (13) and the connecting portion (11).

8. The abrasive sheet of any of claims 1-3, wherein: An outer edge of an end surface of the mounting portion (12) opposite to the adhering surface (121) is inclined from inside to outside toward the adhering surface (121).

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