Roller set and wire cutting machine

Abstract

The utility model discloses a roller set and a wire cutting machine, the roller set comprises a first roller, a second roller and a third roller which are arranged in parallel in the axial direction, the first roller and the second roller are located on the same horizontal plane, and the third roller is located below the horizontal plane and located between the first roller and the second roller. The third roller comprises a first winding part, a second winding part and a wire separating part located between the first winding part and the second winding part, the first winding part is provided with a plurality of first winding grooves formed in the circumferential direction, the second winding part is provided with a plurality of second winding grooves formed in the circumferential direction, and the wire separating part is provided with a plurality of wire separating grooves inclined to the circumferential direction. According to the wire cutting machine, the arrangement time of the cutting wire net can be shortened, the loss of cutting wires is reduced, and the slicing efficiency of the wire cutting machine is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of wire cutting machines, and in particular relates to a roller set and a wire cutting machine. Background Art

[0002] Silicon wafer multi-wire cutting technology is currently the most advanced silicon wafer processing technology in the world. Its principle is to achieve the cutting effect by rubbing the silicon rod with a high-speed cutting wire. In this process, the cutting wire is wound on a roller set to form a cutting wire network, which can perform hundreds or thousands of cuts at the same time to obtain hundreds or thousands of silicon wafers.

[0003] With the rapid development of the photovoltaic industry, all links of crystal pulling, slicing, batteries, and modules need to reduce costs and increase efficiency, develop technology, and innovate science and technology. The edge skin of silicon rods is also fully utilized and spliced ​​into spliced ​​silicon rods for cutting into slices to improve the utilization rate of silicon rods and achieve the purpose of reducing costs and increasing efficiency. However, for spliced ​​silicon rods, due to the large difference in the physical properties of the adhesive layer and the silicon rods, in the process of cutting the spliced ​​parts of the spliced ​​silicon rods through the cutting wire mesh, due to the uneven force on the cutting wire, the cutting wire will break during the cutting process, the cutting force will drop rapidly, and other undesirable performances will occur, resulting in greater losses.

[0004] In order to prevent the cutting wire from breaking, the current cutting of spliced ​​silicon rods mostly adopts the wire-splitting net cutting method. That is, the cutting wire net does not set cutting wires at the splicing of silicon rods, and only uses cutting wires to slice silicon rods at non-splicing joints. At present, the manual wire-splitting net is to remove the cutting wires at the splicing of silicon rods by cutting and reconnecting the cutting wire net on the wire cutting machine roller group. However, due to the relatively large number of splicing of spliced ​​silicon rods, manual wire-splitting nets take a lot of time, which increases the loss of cutting wires and reduces slicing efficiency.

[0005] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0006] The utility model aims to provide a roller group and a wire cutting machine, which can automatically divide the wire net through the roller group, shorten the arrangement time of the cutting wire net, reduce the loss of the cutting wire, and improve the slicing efficiency.

[0007] In order to achieve the above purpose, the technical solution provided by a specific embodiment of the utility model is as follows:

[0008] A roller assembly, the roller assembly comprising a first roller, a second roller, and a third roller which are arranged parallel to each other along the axial direction, the first roller and the second roller are located in the same horizontal plane, the third roller is located below the horizontal plane and between the first roller and the second roller, the third roller comprises a first winding portion, a second winding portion, and a dividing portion located between the first winding portion and the second winding portion, the first winding portion is provided with a plurality of first winding grooves arranged along the circumferential direction, the second winding portion is provided with a plurality of second winding grooves arranged along the circumferential direction, and the dividing portion is provided with a plurality of dividing grooves which are arranged obliquely to the circumferential direction.

[0009] In one or more embodiments of the present invention, the first roller includes a third winding portion, a fourth winding portion, and a first connecting portion located between the third winding portion and the fourth winding portion, the third winding portion is provided with a plurality of third winding grooves arranged along the circumferential direction, and the fourth winding portion is provided with a plurality of fourth winding grooves arranged along the circumferential direction;

[0010] The second roller includes a fifth winding portion, a sixth winding portion, and a second connecting portion located between the fifth winding portion and the sixth winding portion, the fifth winding portion is provided with a plurality of fifth winding grooves arranged along the circumferential direction, and the sixth winding portion is provided with a plurality of sixth winding grooves arranged along the circumferential direction.

[0011] In one or more embodiments of the present invention, the outer wall of the first connecting portion and / or the second connecting portion is / are arranged in the form of a smooth annular surface.

[0012] In one or more embodiments of the present invention, the lengths of the first winding portion, the third winding portion, and the fifth winding portion are equal, the number of the first winding grooves, the third winding grooves, and the fifth winding grooves are equal, and the spacing between two adjacent first winding grooves, two adjacent third winding grooves, and two adjacent fifth winding grooves is equal; and / or,

[0013] The second winding portion, the fourth winding portion, and the sixth winding portion are of equal length, the number of the second winding grooves, the fourth winding grooves, and the sixth winding grooves are equal, and the spacing between two adjacent second winding grooves, two adjacent fourth winding grooves, and two adjacent sixth winding grooves is equal; and / or,

[0014] The lengths of the branching portion, the first connecting portion, and the second connecting portion are equal.

[0015] In one or more embodiments of the present invention, the distance between the third roller and the first roller is equal to the distance between the third roller and the second roller.

[0016] In one or more embodiments of the present invention, the wiring slot includes a first end and a second end, the first end is spaced apart from or connected to the first winding slot, and the second end is spaced apart from or connected to the second winding slot; and / or,

[0017] On a plane perpendicular to the axial direction, an opening angle of an orthographic projection area of ​​the branching groove is 60° to 180°.

[0018] In one or more embodiments of the present invention, the third roller includes a main body and a covering layer arranged on the outside of the main body, and the first winding groove, the second winding groove, and the dividing groove are all arranged on the covering layer.

[0019] In one or more embodiments of the present invention, a plurality of first winding grooves are evenly distributed along the axial direction on the first winding portion; and / or,

[0020] A plurality of second winding grooves are evenly distributed in the axial direction on the second winding portion; and / or,

[0021] A plurality of line dividing grooves are evenly distributed on the line dividing portion.

[0022] In one or more embodiments of the present invention, the spacings between two adjacent branching grooves, two adjacent first winding grooves, and two adjacent second winding grooves are equal.

[0023] Another specific embodiment of the present invention provides a technical solution as follows:

[0024] A wire cutting machine comprises the above-mentioned roller set and a cutting wire net wound on the roller set.

[0025] Compared with the prior art, the utility model has the following beneficial effects:

[0026] The utility model provides a roller group and a wire cutting machine. The cutting wire net can automatically separate the wire net under the action of the roller group to avoid the joints of the spliced ​​silicon rods, thereby avoiding the problems of wire breakage and rapid drop in cutting force during the cutting process.

[0027] The utility model can shorten the arrangement time of the cutting wire net, reduce the loss of the cutting wire, and improve the slicing efficiency of the wire cutting machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 This is a schematic diagram of the three-dimensional structure of the roller group in the first embodiment of the utility model;

[0030] Figure 2This is a schematic diagram of the main structure of the roller assembly in the first embodiment of the utility model;

[0031] Figure 3 This is a side structural schematic diagram of the roller assembly in the first embodiment of the utility model;

[0032] Figure 4 This is a partial structural schematic diagram of the third roller in the first embodiment of the utility model;

[0033] Figure 5 It is a side view structural schematic diagram of the third roller in the first embodiment of the utility model;

[0034] Figure 6 It is a partial structural schematic diagram of the third roller in the second embodiment of the utility model;

[0035] Figure 7 This is a schematic diagram of the partial structure of the third roller in the third embodiment of the utility model;

[0036] Figure 8 It is a schematic diagram of the partial structure of the third roller in the fourth embodiment of the utility model. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0039] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0040] The technical solution of the present utility model will be described below in conjunction with the accompanying drawings.

[0041] Embodiment 1:

[0042] Reference Figure 1 , Figure 2As shown, the roller assembly in this embodiment includes a first roller 1, a second roller 2, and a third roller 3 which are arranged parallel to each other in the axial direction, the first roller 1 and the second roller 2 are located in the same horizontal plane, the third roller 3 is located below the horizontal plane and between the first roller 1 and the second roller 2, the third roller 3 includes a first winding portion 31, a second winding portion 32, and a dividing portion 33 located between the first winding portion 31 and the second winding portion 32, the first winding portion 31 is provided with a plurality of first winding grooves 311 arranged along the circumferential direction, the second winding portion 32 is provided with a plurality of second winding grooves 321 arranged along the circumferential direction, and the dividing portion 33 is provided with a plurality of dividing grooves 331 which are arranged obliquely to the circumferential direction.

[0043] When the first roller 1, the second roller 2, and the third roller 3 in the roller group rotate in the same direction, the cutting wire can be gradually wound on the roller group to form a cutting wire net, and the cutting wire net can be separated at a certain distance. Since the third roller 3 is provided with a dividing line portion 33, the dividing line portion 33 corresponds to the splicing of the spliced ​​silicon rods, and the dividing line portion 33 is provided with a dividing line groove 331, the cutting wire that should be on the dividing line portion 33 can automatically move to at least one of the two sides, so that the cutting wire net between the first roller 1 and the second roller 2 can be set without a cutting wire in the area corresponding to the dividing line portion 33 of the third roller 3, so that in the process of cutting and splicing silicon rods, the splicing of silicon rods can be avoided, and the undesirable phenomena such as the breaking of the cutting wire and the rapid decrease of the cutting force can be avoided. Through the setting of the roller group, the wire net can be automatically divided, the time for arranging the cutting wire net can be shortened, the loss of the cutting wire can be reduced, and the slicing efficiency can be improved.

[0044] The cutting wire can be a steel wire or a diamond wire, which can ensure the service life of the cutting wire, reduce the occurrence of wire breakage and wire replacement, and is suitable for cutting rigid materials such as silicon wafers.

[0045] Specifically, refer to Figure 2As shown, the third roller 3 in this embodiment includes a main body 301 and a covering layer 302 disposed outside the main body 301, and the first winding groove 311, the second winding groove 321, and the dividing groove 331 are all disposed on the covering layer 302. Of course, the present application is not limited thereto, and the third roller 3 in other embodiments may only include the main body 301, and the first winding groove 311, the second winding groove 321, and the dividing groove 331 are all disposed on the main body 301. Compared with the solution of arranging the first winding groove 311, the second winding groove 321, and the dividing groove 331 on the main body 301, the present embodiment arranges the first winding groove 311, the second winding groove 321, and the dividing groove 331 on the covering layer 302. If the structural shapes of the grooves of the covering layer 302 change after long-term use and become unusable, the covering layer 302 can be thinned and re-grooved to obtain new first winding groove 311, second winding groove 321, and dividing groove 331, thereby extending the service life of the third roller 3.

[0046] Preferably, refer to Figure 2 As shown, in this embodiment, a plurality of first winding grooves 311 are evenly distributed along the axial direction on the first winding portion 31, a plurality of second winding grooves 321 are evenly distributed along the axial direction on the second winding portion 32, and a plurality of branching grooves 331 are evenly distributed on the branching portion 33. According to this design, a cutting wire net with more cutting wires can be obtained, thereby cutting out more silicon wafers.

[0047] Reference Figure 1 , Figure 2 As shown, the first roller 1 in this embodiment includes a third winding portion 11, a fourth winding portion 12, and a first connecting portion 13 located between the third winding portion 11 and the fourth winding portion 12, the third winding portion 11 is provided with a plurality of third winding grooves 111 arranged along the circumferential direction, and the fourth winding portion 12 is provided with a plurality of fourth winding grooves 121 arranged along the circumferential direction; the second roller 2 includes a fifth winding portion 21, a sixth winding portion 22, and a second connecting portion 23 located between the fifth winding portion 21 and the sixth winding portion 22, the fifth winding portion 21 is provided with a plurality of fifth winding grooves 211 arranged along the circumferential direction, and the sixth winding portion 22 is provided with a plurality of sixth winding grooves 221 arranged along the circumferential direction. The cutting wire net can be accommodated in the third winding groove 111 , the fourth winding groove 121 , the fifth winding groove 211 , and the sixth winding groove 221 . Under the action of the third roller 3 , the cutting wire net between the first roller 1 and the second roller 2 can avoid the first connecting portion 13 and the second connecting portion 23 .

[0048] Preferably, refer to Figure 1 , Figure 2As shown, the outer walls of the first connecting portion 13 and the second connecting portion 23 in this embodiment are set in a smooth annular surface. Since the cutting line will move toward both sides under the action of the dividing groove 331, by optimizing the structure of the outer walls of the first connecting portion 13 and the second connecting portion 23, the cutting line on the first roller 1 and the second roller 2 can be moved toward both sides more smoothly and conveniently, so that the cutting line net between the first roller 1 and the second roller 2 can be set without a cutting line in the area corresponding to the dividing portion 33 of the third roller 3.

[0049] Specifically, refer to Figure 1 , Figure 2 As shown, in this embodiment, the lengths of the first winding portion 31, the third winding portion 11, and the fifth winding portion 21 are equal, the number of the first winding groove 311, the third winding groove 111, and the fifth winding groove 211 are equal, and the spacings between two adjacent first winding grooves 311, two adjacent third winding grooves 111, and two adjacent fifth winding grooves 211 are equal. The lengths of the second winding portion 32, the fourth winding portion 12, and the sixth winding portion 22 are equal, the number of the second winding groove 321, the fourth winding groove 121, and the sixth winding groove 221 are equal, and the spacings between two adjacent second winding grooves 321, two adjacent fourth winding grooves 121, and two adjacent sixth winding grooves 221 are equal. The lengths of the branching portion 33, the first connecting portion 13, and the second connecting portion 23 are equal. Therefore, all the first winding grooves 311 , the second winding grooves 321 , the third winding grooves 111 , the fourth winding grooves 121 , the fifth winding grooves 211 , and the sixth winding grooves 221 may be arranged flush, which is convenient for cutting and splicing silicon rods by cutting wire mesh.

[0050] Since the slicing is usually performed using a cutting wire web between the first roller 1 and the second roller 2, Figure 3 As shown, the distance between the third roller 3 and the first roller 1 in this embodiment is equal to the distance between the third roller 3 and the second roller 2. Through this design, the cutting lines wrapped around the first roller 1 and the second roller 2 can be in a symmetrical state. Therefore, the forces exerted on the cutting wire net during the slicing process are also the same, which can avoid the problem of breakage caused by uneven force on the cutting wire.

[0051] In order to facilitate the separation of the cutting line originally located on the dividing line portion 33 to both sides through the dividing line groove 331, refer to Figure 4 As shown, the branching slots 331 in this embodiment include a first end 3311 and a second end 3312 , the first ends 3311 of all branching slots 331 are connected to the first winding slot 311 , and the second ends 3312 of all branching slots 331 are connected to the second winding slot 321 .

[0052] On a plane perpendicular to the axial direction, the opening angle of the orthographic projection area of ​​the dividing groove 331 is 60° to 180°. Figure 5As shown, for the attached Figure 4 The dividing groove 331 framed by the dotted line has an opening angle α of an orthographic projection area of ​​100° on a plane perpendicular to the axial direction.

[0053] Optional, see Figure 1 , Figure 2 As shown, in this embodiment, the spacing between two adjacent wire dividing grooves 331, two adjacent first winding grooves 311, and two adjacent second winding grooves 321 is equal. When the spacing between each groove is equal, the cutting line is gradually distributed on the roller group during the rolling process of the roller group, and the wire dividing groove 331 can separate the cutting line to both sides at a uniform speed to avoid wire jump.

[0054] Embodiment 2:

[0055] The first roller 1 and the second roller 2 in this embodiment are exactly the same as the first roller 1 and the second roller 2 in the first embodiment, except that the structure of the dividing groove 331 of the third roller 3 is different.

[0056] Reference Figure 6 As shown, the first end 3311 of the wire dividing groove 331 in this embodiment is spaced apart from the first winding groove 311, and the second end 3312 of the wire dividing groove 331 is spaced apart from the second winding groove 321. The length of the interval between the first end 3311 of the wire dividing groove 331 and the first winding groove 311 and the interval between the second end 3312 of the wire dividing groove 331 and the second winding groove 321 need to be smaller than the wire diameter of the cutting wire. According to this design, the cutting wire can be prevented from being distributed on the wire dividing portion 33.

[0057] Embodiment three:

[0058] The first roller 1 and the second roller 2 in this embodiment are exactly the same as the first roller 1 and the second roller 2 in the first embodiment, except that the structure of the dividing groove 331 of the third roller 3 is different.

[0059] Reference Figure 7 As shown, the branching slot 331 in this embodiment includes a first branching slot 3313 and a second branching slot 3314 , the first end 3311 of the first branching slot 3313 is connected to the first winding slot 311 , and the second end 3312 of the first branching slot 3313 is connected to the second winding slot 321 .

[0060] The first end 3311 of the second wire dividing groove 3314 is spaced apart from the first winding groove 311, and the second end 3312 of the second wire dividing groove 3314 is spaced apart from the second winding groove 321. The spacing lengths between the first end 3311 of the second wire dividing groove 3314 and the first winding groove 311 and between the second end 3312 of the second wire dividing groove 3314 and the second winding groove 321 need to be smaller than the wire diameter of the cutting wire. According to this design, the cutting wire can be prevented from being distributed on the wire dividing portion 33.

[0061] Of course, the present application is not limited thereto, and one of the first end 3311 of the second wire dividing groove 3314 and the first winding groove 311 or the second end 3312 of the second wire dividing groove 3314 and the second winding groove 321 can be connected, and the other can be spaced apart, and the length of the spaced apart needs to be smaller than the wire diameter of the cutting wire. According to this design, the cutting wire can be prevented from being distributed on the wire dividing portion 33.

[0062] Embodiment 4:

[0063] The first roller 1 and the second roller 2 in this embodiment are exactly the same as the first roller 1 and the second roller 2 in the first embodiment, except that the structure of the dividing groove 331 of the third roller 3 is different.

[0064] Reference Figure 8 As shown, the wire dividing groove 331 in this embodiment includes a first wire dividing groove 3313 and a second wire dividing groove 3314 that are alternately distributed. The first end 3311 of the first wire dividing groove 3313 is connected to the first winding groove 311, and the second end 3312 of the first wire dividing groove 3313 is spaced apart from the second winding groove 321, and the length of the space needs to be smaller than the wire diameter of the cutting wire. The first end 3311 of the second wire dividing groove 3314 is spaced apart from the first winding groove 311, and the second end 3312 of the second wire dividing groove 3314 is connected to the second winding groove 321, and the length of the space also needs to be smaller than the wire diameter of the cutting wire. According to this design, the cutting wire can be prevented from being distributed on the wire dividing portion 33.

[0065] Embodiment five:

[0066] The wire cutting machine in this embodiment includes the aforementioned roller group and a cutting wire net wound on the roller group. Compared with manual wire net separation, the cutting wire net in this embodiment can automatically separate the wire net under the action of the roller group, so that the cutting wire net can avoid the splicing of the spliced ​​silicon rods to avoid the problem of wire breakage and rapid drop in cutting force in the cutting wire net. The wire cutting machine in this embodiment can shorten the time of arranging the cutting wire net, reduce the loss of the cutting wire, and improve the slicing efficiency.

[0067] It can be seen from the above technical solutions that the utility model has the following beneficial effects:

[0068] The utility model provides a roller group and a wire cutting machine. The cutting wire net can automatically separate the wire net under the action of the roller group to avoid the joints of the spliced ​​silicon rods, thereby avoiding the problems of wire breakage and rapid drop in cutting force during the cutting process.

[0069] The utility model can shorten the arrangement time of the cutting wire net, reduce the loss of the cutting wire, and improve the slicing efficiency of the wire cutting machine.

[0070] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0071] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A roller assembly, characterized in that: The roller assembly includes a first roller, a second roller, and a third roller which are arranged parallel to each other in the axial direction, the first roller and the second roller are located in the same horizontal plane, the third roller is located below the horizontal plane and between the first roller and the second roller, the third roller includes a first winding portion, a second winding portion, and a dividing portion located between the first winding portion and the second winding portion, the first winding portion is provided with a plurality of first winding grooves arranged along the circumferential direction, the second winding portion is provided with a plurality of second winding grooves arranged along the circumferential direction, and the dividing portion is provided with a plurality of dividing grooves which are arranged obliquely to the circumferential direction.

2. The roller assembly according to claim 1, characterized in that: The first roller comprises a third winding portion, a fourth winding portion, and a first connecting portion located between the third winding portion and the fourth winding portion, the third winding portion is provided with a plurality of third winding grooves arranged along the circumferential direction, and the fourth winding portion is provided with a plurality of fourth winding grooves arranged along the circumferential direction; The second roller includes a fifth winding portion, a sixth winding portion, and a second connecting portion located between the fifth winding portion and the sixth winding portion, the fifth winding portion is provided with a plurality of fifth winding grooves arranged along the circumferential direction, and the sixth winding portion is provided with a plurality of sixth winding grooves arranged along the circumferential direction.

3. The roller assembly according to claim 2, characterized in that: The outer wall of the first connecting portion and / or the second connecting portion is arranged in a smooth annular surface.

4. The roller assembly according to claim 2, characterized in that: The lengths of the first winding portion, the third winding portion, and the fifth winding portion are equal, the number of the first winding grooves, the third winding grooves, and the fifth winding grooves are equal, and the spacing between two adjacent first winding grooves, two adjacent third winding grooves, and two adjacent fifth winding grooves is equal; and / or, The second winding portion, the fourth winding portion, and the sixth winding portion are of equal length, the number of the second winding grooves, the fourth winding grooves, and the sixth winding grooves are equal, and the spacing between two adjacent second winding grooves, two adjacent fourth winding grooves, and two adjacent sixth winding grooves is equal; and / or, The lengths of the branching portion, the first connecting portion, and the second connecting portion are equal.

5. The roller assembly according to claim 1, characterized in that: The distance between the third roller and the first roller is equal to the distance between the third roller and the second roller.

6. The roller assembly according to claim 1, characterized in that: The wire splitting groove comprises a first end and a second end, the first end is spaced apart from or connected to the first winding groove, and the second end is spaced apart from or connected to the second winding groove; and / or, On a plane perpendicular to the axial direction, an opening angle of an orthographic projection area of ​​the branching groove is 60° to 180°.

7. The roller assembly according to claim 1, characterized in that: The third roller comprises a main body and a covering layer arranged on the outer side of the main body, and the first winding groove, the second winding groove, and the dividing groove are all arranged on the covering layer.

8. The roller assembly according to claim 1, characterized in that: A plurality of first winding grooves are evenly distributed along the axial direction on the first winding portion; and / or, A plurality of second winding grooves are evenly distributed in the axial direction on the second winding portion; and / or, A plurality of line dividing grooves are evenly distributed on the line dividing portion.

9. The roller assembly according to claim 1, characterized in that: The spacings between two adjacent branching grooves, two adjacent first winding grooves, and two adjacent second winding grooves are equal.

10. A wire cutting machine, characterized in that: It comprises the roller assembly as claimed in any one of claims 1 to 9 and a cutting wire net wound around the roller assembly.

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