Fabricated milling cutter capable of realizing quick positioning and mounting of blade

Abstract

The utility model relates to the field of pencil holder manufacturing, in particular to an assembled milling cutter capable of realizing quick positioning and mounting of a blade, which comprises a main body, the mounting cavities are uniformly formed in the outer surface of the main body according to the spiral line track, and at least two mounting cavities are formed in the element line of the outer surface of the main body; a positioning groove is formed in the mounting cavity, the cutter body assembly can be quickly disassembled and assembled in the mounting cavity through the positioning groove, and by arranging the positioning groove, quick positioning during mounting of the cutter body assembly can be better completed, meanwhile, the stability of the cutter body assembly during machining is improved, and the machining quality of the cutter is further guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of pencil holder manufacturing, in particular to an assembled milling cutter capable of realizing rapid positioning and installation of a blade. Background Art

[0002] Wooden pencils are a type of pen used for writing, drawing and sketching. With the increasing demand for student stationery and office stationery, China's pen-making industry has experienced explosive growth. Among them, the environmental performance and performance of wooden pencils are very suitable for today's trend of advocating nature, environmental protection and energy saving. Therefore, wooden pencils are environmentally friendly, healthy, simple, durable and naturally safe, and are loved by parents and children.

[0003] Due to the increasing requirements of people for wooden pencils and the rise of China's pen-making industry, all walks of life are paying more and more attention to the processing quality and speed of pencil pen barrels. One of the factors that has a greater impact on the above effects is the tool. In order to improve the stability of existing tools, the tool body is fixedly installed, such as welding, etc., so the installation accuracy needs to be guaranteed during installation, otherwise it is inconvenient to adjust after fixed installation, which results in a lot of time spent on the installation of the tool body assembly. Therefore, it is very necessary to propose an assembled milling cutter that can realize the rapid positioning and installation of the blade. Utility Model Content

[0004] The purpose of the utility model is to provide an assembled milling cutter that can realize the rapid positioning and installation of the blade, so that the cutter body can be quickly positioned and installed, and can improve the cutting efficiency of wooden pencil shafts and improve the cutting quality, so as to solve the existing technical defects and unattainable technical requirements.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solution: an assembled milling cutter capable of realizing rapid positioning and installation of a blade, comprising:

[0006] A main body, wherein the outer surface of the main body is a curved surface;

[0007] An installation cavity, wherein the installation cavity is evenly arranged on the outer surface of the main body along a spiral trajectory, and at least two installation cavities are arranged on the plain line of the outer surface of the main body;

[0008] The knife body assembly is detachably mounted in the mounting cavity.

[0009] It should be emphasized that in this application, the curved surface can be regarded as the trajectory of a moving line moving in space, and this moving line is called a mother line. When the mother line is at any position on the curved surface, the line formed is called a prime line, so in this application, the main body can be a cylinder, a cone or a truncated cone, etc., and at least two mounting cavities are arranged on the prime line on the outer surface of the main body. This sentence means that if there is a prime line with a mounting cavity arranged on it, then there are at least two mounting cavities on this prime line, that is, either there is no mounting cavity on the prime line, or at least two mounting cavities are arranged on the prime line.

[0010] Preferably, the blade assembly comprises:

[0011] A milling cutter seat, wherein the milling cutter seat is detachably mounted in the mounting cavity via a connecting piece;

[0012] The milling blade is fixedly mounted on a milling cutter seat, and the cutting edge of the milling blade is parallel to a straight line on a plane where the cutting edge is located.

[0013] Preferably, the installation cavity comprises:

[0014] A positioning groove, wherein the milling cutter seat is installed in the positioning groove;

[0015] The chip removal groove is arranged on one side of the positioning groove, and the milling cutter blade extends toward the chip removal groove to the top of the chip removal groove.

[0016] Preferably, the milling blade is divided into:

[0017] A first milling blade, the first milling blade is located on a milling cutter seat at the end of the spiral track, and the first milling blade is provided with a cutting edge;

[0018] A second milling blade, the second milling blade is located on a milling cutter seat in the middle of the spiral track, and the second milling blade has two cutting edges symmetrically arranged thereon;

[0019] The profile of the cutting edge is the same as the outer profile of one quarter of the cross section of a wooden pencil.

[0020] Preferably, a limiting protrusion is provided in the middle of the positioning groove, and a limiting portion is provided on the inner side wall of the positioning groove;

[0021] A limiting groove is provided at the bottom of the milling cutter seat, and a fitting portion is provided on the outer side wall;

[0022] The limiting protrusion is arranged in the limiting groove, and the limiting portion and the fitting portion are tightly fitted.

[0023] Preferably, the limiting protrusion is provided with a first connecting hole;

[0024] A second connecting hole is provided in the limiting groove, and the second connecting hole passes through the milling cutter seat;

[0025] One end of the connecting piece abuts against the upper surface of the milling cutter seat, and the other end passes through the second connecting hole and is connected with the first connecting hole.

[0026] Preferably, a plurality of chip storage grooves are provided in the positioning groove at one end away from the chip removal groove, and the chip storage grooves are symmetrically distributed on the side wall of the positioning groove.

[0027] Preferably, the distance between the two closest cutting edges on two adjacent milling blades on the same spiral line is the same as the width of a pencil;

[0028] And the distance between the two closest cutting edges on two adjacent milling blades on the same element line is the same as the width of 5 pencils.

[0029] Preferably, the main body is a cylinder, and the circumferential spacing between two adjacent milling blades on the same spiral line is one tenth of a circle.

[0030] Preferably, the limiting parts are located on both sides of the limiting groove, and the limiting parts are arranged in an arc shape;

[0031] The fitting parts are located on both sides of the limiting protrusion, and the fitting parts are arranged in an arc shape complementary to the limiting part;

[0032] The chip storage groove is arranged in a semicircular shape.

[0033] Compared with the prior art, the beneficial effects of the utility model are:

[0034] 1. The present application provides a knife body assembly distributed on the main body according to a spiral trajectory, and provides a knife body assembly that can fully cut wooden pencils, thereby reducing the cutting amount of each knife body assembly, reducing the cutting force, and improving the processing surface quality and processing efficiency.

[0035] 2. The arrangement of the chip removal groove and the chip storage groove can make the chip removal in the cutting process smoother, and make the two adjacent cutter body components not affect each other during cutting, thereby improving the processing stability and the surface processing quality of the wooden pencil.

[0036] 3. By setting the positioning groove, the present application can better complete the rapid positioning of the cutter body assembly during installation, and at the same time improve the stability of the cutter body assembly during processing, further ensuring the processing quality of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0038] Figure 2 For the utility model Figure 1 A local enlarged schematic diagram of the middle A;

[0039] Figure 3 It is a schematic diagram of the overall structure of the main body in the utility model;

[0040] Figure 4 For the utility model Figure 3 A partial enlarged schematic diagram of point B in the middle;

[0041] Figure 5 This is a schematic diagram of the overall structure of the knife body assembly in the utility model;

[0042] Figure 6 This is a schematic diagram of the overall structure of the blade assembly of the utility model from other angles;

[0043] Figure 7 It is an expanded view of the overall structure of the utility model;

[0044] Figure 8 It is a schematic diagram of the overall structure of the working state of the utility model;

[0045] Fig. 9 It is a side structural schematic diagram of the working state of the utility model;

[0046] Fig.10 According to the utility model Fig. 9 Schematic diagram of the structure obtained by vertical cutting at the CC position;

[0047] Fig.11 For the utility model Fig.10 The partial enlarged schematic diagram shown at D in the middle;

[0048] In the figure: main body 1, mounting cavity 2, positioning groove 201, limiting protrusion 2011, limiting portion 2012, chip storage groove 2013, chip removal groove 202, cutter body assembly 3, milling cutter seat 301, limiting groove 3011, fitting portion 3012, milling blade 302, first milling blade 3021, second milling blade 3022, wooden pencil 4, connecting piece 5, first connecting hole 6, second connecting hole 7. DETAILED DESCRIPTION

[0049] The following will be combined with the attached embodiment of the utility model Figure 1-11 , clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0050] In the description of the present utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0051] See also Figure 1-11 , the utility model embodiment:

[0052] Example:

[0053] like Figure 1 , 3 As shown in Figure 5: An assembled milling cutter capable of realizing rapid positioning and installation of a blade, comprising:

[0054] A main body 1, wherein the outer surface of the main body 1 is a curved surface;

[0055] The installation cavity 2 is evenly arranged on the outer surface of the main body 1 along a spiral trajectory, and two installation cavities 2 are arranged on each line on the outer surface of the main body 1;

[0056] The blade body assembly 3 is detachably installed in the installation cavity 2.

[0057] In this embodiment, specifically, the main body 1 is provided with a cylindrical body;

[0058] When in use, the wooden pencil 4 extends from the tangent of the outer surface of the main body 1, and cooperates with the knife body assembly 3 to cut the surface of the wooden pencil 4. The setting of the mounting cavity 2 makes the knife body assembly 3 more stable, and the spiral line distribution of the knife body assembly 3 and the mounting cavity 2 makes the distribution space of the knife body assembly 3 larger, thereby improving the utilization space of the knife body assembly 3, so that more knife body assemblies 3 can be installed in the vertical height, so that the present embodiment can process more wooden pencils 4 at the same time. It should be noted that the vertical height here is the axial direction of the main body 1, so as to improve the processing efficiency in the present embodiment. At the same time, two mounting cavities 2, that is, two knife body assemblies 3, are arranged on each element line on the curved surface of the outer surface of the main body 1, so that the trajectory of the spiral line is denser, further increasing the number of simultaneous processing in the present embodiment, and further improving the processing efficiency.

[0059] like Figure 1 , 5 As shown in Figure 6: the blade assembly 3 includes:

[0060] A milling cutter seat 301, wherein the milling cutter seat 301 is detachably mounted in the mounting cavity 2 via a connecting member 5;

[0061] The milling blade 302 is fixedly mounted on the milling cutter seat 301, and the cutting edge of the milling blade 302 is parallel to the element line on the plane where the cutting edge is located.

[0062] In this embodiment, it should be noted that the parallel relationship between the cutting edge and the element line is that the straight line where the cutting edge is located is in the same direction as the element line, that is, the opening direction of the milling blade 302 is not the vertical direction, so the wooden pencil 4 is cut from the tangent direction of the outer wall of the main body 1. Only in this way can the wooden pencil 4 be cut by the rotation of the main body 1. The specific milling blade 302 is a welded milling blade 302, and the cutting edge portion of the milling blade 302 is diamond to increase the cutting force, reduce the friction between the milling blade 302 and the workpiece, and improve the cutting quality.

[0063] like Figure 3 and 4 As shown: the installation cavity 2 includes:

[0064] A positioning groove 201, wherein the milling cutter seat 301 is installed in the positioning groove 201;

[0065] The chip groove 202 is arranged on one side of the positioning groove 201 , and the milling blade 302 extends toward the chip groove 202 to the top of the chip groove 202 .

[0066] In this embodiment, specifically, the shape of the chip groove 202 is set to be capsule-shaped, and the bottom of the chip groove 202 is gradually inclined and raised from the end close to the milling blade 302 to the end far away from the milling blade 302. Here, the rising means getting farther and farther away from the center of the main body 1, so as to facilitate the discharge of wood chips;

[0067] The chip groove 202 is provided to effectively store and discharge the wood chips generated during processing, reduce the excessive cutting temperature caused by the accumulation of wood chips and the interference effect on the processing of the next milling blade 302, thereby improving the processing quality of this embodiment.

[0068] like Figure 1 , 5 As shown in FIG. 6 , the milling blade 302 is divided into:

[0069] A first milling blade 3021, wherein the first milling blade 3021 is located on the milling cutter seat 301 at the end of the spiral track, and the first milling blade 3021 is provided with a cutting edge;

[0070] A second milling blade 3022, the second milling blade 3022 is located on the milling cutter seat 301 in the middle of the spiral track, and the second milling blade 3022 is symmetrically provided with two cutting edges;

[0071] The profile of the cutting edge is the same as one quarter of the outer profile of the cross section of the wooden pencil 4 .

[0072] In this embodiment, the milling blade 302 is set to two types, that is, the milling blade 302 on the end face of the main body 1 is a cutting edge, and the middle milling blade 302 is provided with two symmetrical cutting edges, so that both sides of the milling blade 302 can process the wooden pencil 4. It should be emphasized that during processing, the wooden pencil 4 is processed by only one cutting edge on the milling blade 302 at a time, and because of the setting of the spiral trajectory and the double cutting edges, when the wooden pencil is processed, there are cutting edges of the milling blade 302 on both sides, but with the rotation of the main body 1, after one side of the wooden pencil 4 is processed by one cutting edge, the main body 1 rotates, and the other side will be cut by the cutting edge of the other milling blade 302, so the wooden pencil 4 is only cut by the cutting edge of one milling blade 302 at the same time. It should be noted that when the main body 1 rotates and cuts, the wooden pencil 4 also makes a forward feeding motion, that is, the uncut part is pushed toward the cutting edge close to the milling blade 302, and because of the setting of the density of the spiral line, each surface of the wooden pencil 4 will be cut by two cutting edges, but they are cut in sequence, not at the same time.

[0073] The present embodiment is so arranged that the cutting edge has less cutting amount each time, reduces cutting force and cutting vibration, and improves processing quality. In addition, this design can control the chips to be discharged along the same direction, avoiding chip removal being blocked and causing processing quality to deteriorate.

[0074] like Figure 4 , 5 As shown in FIG. 6 , a limiting protrusion 2011 is provided in the middle of the positioning groove 201 , and a limiting portion 2012 is provided on the inner side wall of the positioning groove 201 ;

[0075] A limiting groove 3011 is provided at the bottom of the milling cutter seat 301, and a fitting portion 3012 is provided on the outer side wall of the milling cutter seat 301;

[0076] The limiting protrusion 2011 is disposed in the limiting groove 3011 , and the limiting portion 2012 and the fitting portion 3012 are tightly fitted.

[0077] In this embodiment, the limiting portions 2012 are located on both sides of the limiting groove 3011, and the limiting portions 2012 are configured to be arc-shaped;

[0078] The fitting portions 3012 are located on both sides of the limiting protrusion 2011, and the fitting portions 3012 are arranged in an arc shape complementary to the limiting portion 2012;

[0079] The setting of the limiting part 2012 allows the positioning between the milling cutter seat 301 and the positioning groove 201 to be quickly realized when the milling blade 302 is installed, and the spatial freedom of the milling cutter seat 301 can be completely limited, effectively avoiding the processing quality deterioration caused by the micro displacement of the seat during the processing, so as to ensure the cutting quality.

[0080] The arrangement of the limiting protrusion 2011 and the limiting groove 3011 increases the installation stability between the milling cutter seat 301 and the positioning groove 201 .

[0081] like Figure 4 , 5 As shown in FIG. 6 , the limiting protrusion 2011 is provided with a first connecting hole 6 ;

[0082] The limiting groove 3011 is provided with a second connecting hole 7, and the second connecting hole 7 passes through the milling cutter seat 301;

[0083] One end of the connecting member 5 abuts against the upper surface of the milling cutter seat 301 , and the other end passes through the second connecting hole 7 and is connected to the first connecting hole 6 .

[0084] In the present embodiment, specifically, the connecting member 5 is a screw, and the inner wall of the first connecting hole 6 is provided with a thread, that is, the connection between the milling cutter seat 301 and the main body 1 is through a screw connection. With such a configuration, the screw has a strong self-locking property, can well limit the milling cutter seat 301, and the screw is easy to disassemble, which facilitates the replacement of the cutter body assembly 3 and improves the processing efficiency.

[0085] like Figure 2 and 4 As shown, a plurality of chip storage grooves 2013 are provided at one end of the positioning groove 201 away from the chip removal groove 202 , and the chip storage grooves 2013 are symmetrically distributed on the side wall of the positioning groove 201 .

[0086] The chip storage groove 2013 is configured in a semicircular shape.

[0087] In this embodiment, the chip groove 2013 is configured to accumulate excess chips during the cutting rotation process of the main body 1, so that when the milling cutter seat 301 is installed, the chip groove 2013 can store a small amount of chips, thereby avoiding the presence of a small amount of debris between the contact part of the milling cutter seat 301 and the positioning groove 201, which reduces the installation accuracy of the milling cutter seat 301, thereby improving the stability of the cutter body assembly 3 during cutting.

[0088] like Figure 7-11 As shown: the distance between the two closest cutting edges on two adjacent milling blades 302 on the same spiral line is the same as the width of a wooden pencil 4;

[0089] Furthermore, the distance between the two closest cutting edges of two adjacent milling blades 302 on the same element line is the same as the width of five wooden pencils 4 .

[0090] In this embodiment, it should be emphasized that the distance between adjacent milling blades 302 here is the distance in the vertical direction, that is, the cutting edges on the milling blade 302 mentioned above are symmetrically distributed, so it can be understood here that on the spiral line, the distance between the symmetry axes of the cutting edges on two adjacent milling blades 302 is the distance of a wooden pencil 4, and the distance of 5 pencils is the distance between two adjacent cutting edges on the same element line, and the distance between these two symmetry axes, but it should be noted that in this case, the distance between two symmetrically distributed cutting edges on the same milling blade 302 is close, that is, when the distance between the two can be ignored, the above-mentioned equivalence can be understood here. A better way to understand the term "distance" is that as mentioned above, the outline of the cutting edge is the same as the size of one-quarter of the circumference of a wooden pencil 4, so on two adjacent milling blades 302 on the same spiral line, the two closest cutting edges just form half the circumference of a wooden pencil 4, so the diameter formed by the two closest cutting edges on the two milling blades 302 is the diameter of one wooden pencil 4; the distance of five pencils is understood in the same way, because the main body 1 in the present application is not limited to a cylinder, so in this embodiment, the above distance can be equivalent to the vertical height, but if it is an inclined surface such as a cone, it is more convenient to understand the above distance as the straight-line distance between the axes of symmetry.

[0091] This embodiment is configured in this way in order to be able to process multiple wooden pencils 4 at the same time. During processing, multiple pencil rods are placed side by side (it should be emphasized that the plane formed by the placement of multiple pencils should be parallel to the curved surface), and a pencil rod milling cutter is arranged above and below the pencils. The main body 1 performs high-speed rotation, the pencil rod performs lateral feeding, the upper cutter assembly 3 processes the upper half of the pencil rod, and the lower cutter assembly 3 processes the lower half of the pencil rod, so that multiple pencils can be processed simultaneously. The cutting edges of adjacent cutter assemblies 3 on the same cutter assembly 3 cut both sides of the wooden pencil 4 on the same half surface, so that multiple pencils can be cut comprehensively at the same time, so as to improve the processing efficiency of this application.

[0092] like Figure 1 As shown in the figure, the main body 1 is a cylinder, and the circumferential spacing between two adjacent milling blades 302 on the same spiral line is one tenth of a circle.

[0093] In this embodiment, the distance here refers to the distance in the circumferential direction, while the above distance refers to the distance in the vertical direction.

[0094] This embodiment further limits the distance between the blade assemblies 3 in the circumferential direction, further restricts the density of the distribution of the blade assemblies 3, and further improves the processing efficiency of processing multiple wooden pencils 4 at the same time.

[0095] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0096] 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 can also be appropriately combined to form other implementation modes that those skilled in the art can understand.

Claims

1. An assembled milling cutter capable of realizing rapid positioning and installation of a blade, characterized in that: include: A main body (1), wherein the outer surface of the main body (1) is a curved surface; An installation cavity (2), the installation cavity (2) being evenly opened on the outer surface of the main body (1) along a spiral trajectory, and at least two installation cavities (2) are arranged on a plain line on the outer surface of the main body (1), and a positioning groove (201) is arranged in the installation cavity (2); A knife body assembly (3), wherein the knife body assembly (3) can be quickly disassembled and assembled in the installation cavity (2) through a positioning groove (201).

2. The assembled milling cutter capable of realizing rapid positioning and installation of a blade according to claim 1, characterized in that: The blade assembly (3) comprises: A milling cutter seat (301), wherein the milling cutter seat (301) is detachably mounted in the positioning groove (201) via a connecting piece (5); A milling blade (302), wherein the milling blade (302) is fixedly mounted on a milling cutter seat (301), and the cutting edge of the milling blade (302) is parallel to a straight line on a plane where the cutting edge is located.

3. The assembled milling cutter capable of realizing rapid positioning and installation of a blade according to claim 2, characterized in that: A limiting protrusion (2011) is provided in the middle of the positioning groove (201), and a limiting portion (2012) is provided on the inner side wall of the positioning groove (201); A limiting groove (3011) is provided at the bottom of the milling cutter seat (301), and a fitting portion (3012) is provided on the outer side wall of the milling cutter seat (301); The limiting protrusion (2011) is arranged in the limiting groove (3011), and the limiting portion (2012) and the fitting portion (3012) are tightly fitted.

4. The assembled milling cutter capable of realizing rapid positioning and installation of a blade according to claim 3, characterized in that: The limiting protrusion (2011) is provided with a first connection hole (6); A second connecting hole (7) is provided in the limiting groove (3011), and the second connecting hole (7) passes through the milling cutter seat (301); One end of the connecting member (5) abuts against the upper surface of the milling cutter seat (301), and the other end passes through the second connecting hole (7) and is connected to the first connecting hole (6).

5. An assembled milling cutter capable of realizing rapid positioning and installation of a blade according to claim 2, 3 or 4, characterized in that: The installation cavity (2) is also provided with: A chip removal groove (202) is provided on one side of the positioning groove (201), and the milling blade (302) extends toward the chip removal groove (202) to the top of the chip removal groove (202).

6. The assembled milling cutter capable of realizing rapid positioning and installation of a blade according to claim 5, characterized in that: The milling blade (302) is divided into: A first milling blade (3021), the first milling blade (3021) being located on a milling cutter seat (301) at the end of the spiral track, and the first milling blade (3021) being provided with a cutting edge; A second milling blade (3022), the second milling blade (3022) being located on a milling cutter seat (301) in the middle of the spiral track, and the second milling blade (3022) being symmetrically provided with two cutting edges; The profile of the cutting edge is the same as one quarter of the outer profile of the cross section of a wooden pencil (4).

7. The assembled milling cutter capable of realizing rapid positioning and installation of a blade according to claim 4, characterized in that: A plurality of chip storage grooves (2013) are provided at one end of the positioning groove (201) away from the chip removal groove (202), and the chip storage grooves (2013) are symmetrically distributed on the side wall of the positioning groove (201).

8. An assembled milling cutter capable of realizing rapid positioning and installation of a blade according to claim 2, 3, 4 or 7, characterized in that: The distance between the two closest cutting edges on two adjacent milling blades (302) on the same spiral trajectory is the same as the width of a wooden pencil (4); Furthermore, the distance between the two closest cutting edges on two adjacent milling blades (302) on the same element line is the same as the width of five wooden pencils (4).

9. The assembled milling cutter capable of realizing rapid positioning and installation of a blade according to claim 8, characterized in that: The main body (1) is a cylinder, and the circumferential spacing between two adjacent milling blades (302) on the same spiral trajectory is one tenth of a circle.

10. The assembled milling cutter capable of realizing rapid positioning and installation of a blade according to claim 7, characterized in that: The limiting portions (2012) are located on both sides of the limiting groove (3011), and the limiting portions (2012) are configured to be arc-shaped; The fitting portions (3012) are located on both sides of the limiting protrusion (2011), and the fitting portions (3012) are configured to be arc-shaped complementary to the limiting portion (2012); The chip storage groove (2013) is configured to be semicircular.

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