Needle selector

Abstract

The utility model relates to the technical field of flat knitting machine equipment, in particular to a needle selector, which comprises a shell, a PCB (printed circuit board), a coil and a PIN, an installation cavity is arranged in the shell, two opposite ends of the shell are respectively provided with a first opening and a second opening which are communicated with the installation cavity, the coil is arranged in the installation cavity through a limit structure, and the PIN is arranged in the installation cavity. A lead of the coil is welded with one end of the PIN, the PCB is provided with a first notch, the other end of the PIN is inserted into the first notch, and the PCB is installed on the second opening. Specifically, the PCB is installed on the second opening and connected with the shell, the coil is welded to one end of the PIN, then the coil is limited in the installation cavity through the limiting structure, at the moment, the other end of the PIN is inserted into the first notch, the PIN and the PCB can be fixed, contact points of the PIN and the PCB can be automatically welded through a tin soldering machine, and therefore the contact points of the PIN and the PCB can be automatically welded. Manual welding one by one is not needed, and time and labor are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of flat knitting machine equipment, in particular to a needle selector. Background Art

[0002] Most existing needle selectors use electromagnetic needle selectors, and their working principle is as follows: a permanent magnet installed on the cutter head is controlled by energizing the coil. After the coil is energized, N poles and S poles are generated at both ends of the coil. According to the principle of like poles repel and opposite poles attract, the N pole and S pole of the coil are changed by the on and off direction of the coil, thereby controlling the up and down movement of the cutter head.

[0003] At present, the existing needle selector includes a coil, a metal cutter head structure, a PCB adapter plate and a shell. The shell is installed on the PCB adapter plate. An installation cavity is opened in the shell. The metal cutter head structure, the coil and the PCB adapter plate are sequentially arranged in the installation cavity along the depth direction of the installation cavity. Side panels are fixedly connected on both sides of the shell. A cover plate is also arranged between the PCB board and the side panel. The cover plate is screwed to the shell through multiple bolts. The metal cutter head is rotatably connected to the side panel through an axle pin, and the two sides are fixedly connected to the shell through multiple bolts. The coil and the PCB adapter plate are connected by winding with soft-wrapped wire.

[0004] However, the existing needle selector has low efficiency in multiple assembly processes. When assembling the coil and the PCB board, the existing coil and PCB board are connected through a soft wire package. Since the material of the soft wire package is soft, it is necessary to manually solder the soft wire package to the PCB board one by one, which is time-consuming and labor-intensive, and the overall assembly production efficiency is low. Utility Model Content

[0005] (I) The problem to be solved by the present invention is: how to improve the production efficiency of the needle selector.

[0006] (II) Technical solution

[0007] The utility model provides a needle selector, comprising a housing, a PCB board, a coil and a PIN needle;

[0008] The housing has a mounting cavity therein, and opposite ends of the housing have a first opening and a second opening respectively connected to the mounting cavity;

[0009] The coil is installed in the installation cavity through a limiting structure, the lead of the coil is welded to one end of the PIN needle, the PCB board is provided with a first notch, and the other end of the PIN needle is inserted into the first notch;

[0010] The PCB board is installed on the second opening.

[0011] According to an embodiment of the utility model, the coil, the PIN needle and the first notch are provided in plurality, each of the coils includes two leads, one end of each of the PIN needles is welded to one of the leads, and the other end thereof is inserted into one of the first notches;

[0012] The direction from the first opening to the second opening is a first direction, and the direction perpendicular to the first direction is a second direction;

[0013] The plurality of coils are arranged in sequence along the second direction.

[0014] According to an embodiment of the present invention, a mounting frame is installed in the mounting cavity, and the mounting frame divides the mounting cavity into a first cavity and a second cavity.

[0015] According to an embodiment of the utility model, both sides of the mounting frame are provided with a plurality of receiving grooves arranged sequentially along the first direction, and the plurality of receiving grooves on both sides of the mounting frame are arranged alternately in sequence in the second direction;

[0016] The receiving groove penetrates the mounting frame along a first direction, and the outer side of the receiving groove is an open structure.

[0017] According to an embodiment of the utility model, the limiting structure includes a protrusion provided on the inner wall of the accommodating groove and a first groove provided on the outer wall of the coil; the protrusion cooperates with the first groove to limit the movement of the coil along the first direction.

[0018] According to an embodiment of the utility model, the coil includes a skeleton and an enameled wire, and the enameled wire is wound around the outside of the skeleton;

[0019] The first groove is provided on the outer wall at the lower side of the frame.

[0020] According to an embodiment of the utility model, the skeleton includes a ring column, both ends of which are fixedly connected with an annular baffle and a U-shaped seat, the outer wall of the U-shaped seat is provided with the first groove, and the enameled wire is wound around the ring column.

[0021] According to an embodiment of the utility model, a second notch is provided on the frame, the lead of the enameled wire is confined in the second notch, and the lead is wound around the end of the PIN needle and welded to the PIN needle.

[0022] According to an embodiment of the utility model, the housing includes a shell and a cover plate, a plurality of plastic plugs are fixedly connected to the cover plate, a plurality of mounting holes are opened on the shell, and the plastic plugs are interference fit with the mounting holes.

[0023] According to one embodiment of the utility model, the needle selector further includes a cutter head structure;

[0024] The cutter head structure comprises a metal cutter head and a plastic cutter head mounting portion, the metal cutter head and the plastic cutter head mounting portion are integrally injection-molded, and the plastic cutter head mounting portion is located in the first cavity;

[0025] The plastic cutter head mounting portion is rotatably connected to the housing via an axle pin.

[0026] Beneficial effects of the utility model:

[0027] Specifically, the PCB board is installed on the second opening and connected to the shell. First, the coil and one end of the PIN needle are welded, and then the coil is limited in the installation cavity by the limiting structure. At this time, the other end of the PIN needle is inserted into the first notch, and then the PIN needle and the PCB board can be fixed in place, so that the contact points of the PIN needle and the PCB board can be automatically welded by a soldering machine, and there is no need to weld one by one manually, which saves time and effort and improves the overall production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of 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 A three-dimensional diagram provided for an embodiment of the utility model;

[0030] Figure 2 A three-dimensional view of the interior of a housing provided by an embodiment of the utility model;

[0031] Figure 3 An exploded perspective view provided for an embodiment of the utility model;

[0032] Figure 4 A three-dimensional diagram of a coil provided in an embodiment of the utility model;

[0033] Figure 5 A diagram of a cover plate provided for an embodiment of the utility model.

[0034] Icons: 1. Shell; 101. Shell; 102. Cover; 103. Side panel; 104. Top cover; 2. Coil; 201. Skeleton; 202. Enameled wire; 3. Cutting head structure; 301. Metal cutting head; 302. Plastic cutting head mounting part; 4. PCB board; 5. PIN needle; 6. First groove; 7. First notch; 8. Pin; 9. Mounting hole; 10. Second notch; 11. Raised part. DETAILED DESCRIPTION

[0035] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. 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.

[0036] like Figures 1 to 5 As shown, an embodiment of the utility model provides a needle selector, comprising: a housing 1, a PCB board 4, a coil 2 and a PIN needle 5;

[0037] The housing 1 has a mounting cavity therein, and opposite ends of the housing 1 have a first opening and a second opening respectively connected to the mounting cavity;

[0038] The coil 2 is installed in the installation cavity through a limiting structure, the lead wire of the coil 2 is welded to one end of the PIN needle 5 , the PCB board 4 is provided with a first notch 7 , and the other end of the PIN needle 5 is inserted into the first notch 7 .

[0039] Specifically, the PCB board 4 is installed on the second opening and connected to the shell 1. First, the coil 2 and one end of the PIN needle 5 are welded, and then the coil 2 is limited in the installation cavity by the limiting structure. At this time, the other end of the PIN needle 5 is inserted into the first notch 7, and then the PIN needle 5 and the PCB board 4 can be fixed in place, so that the contact points of the PIN needle 5 and the PCB board 4 can be automatically welded by a soldering machine, and there is no need to weld one by one manually, which saves time and effort and improves the overall production efficiency.

[0040] It should be noted that the first notch 7 is provided at the edge of the PCB board 4 , and the first notch 7 is a semicircular pad hole, and the diameter of the semicircular pad hole is adapted to the diameter of the PIN needle 5 .

[0041] According to one embodiment of the utility model, Figure 2 As shown, there are multiple coils 2, PIN needles 5 and first notches 7, each coil 2 includes two leads, one end of each PIN needle 5 is welded to a lead, and the other end thereof is correspondingly inserted into a first notch 7;

[0042] The direction from the first opening to the second opening is the first direction, and the direction perpendicular to the first direction is the second direction;

[0043] The plurality of coils 2 are arranged in sequence along the second direction.

[0044] Furthermore, a plurality of first notches 7 are sequentially opened on the PCB board 4 along the first direction, and the number of the first notches 7 is the same as the number of the PIN needles 5 .

[0045] According to an embodiment of the utility model, a mounting frame is installed in the mounting cavity, and the mounting frame divides the mounting cavity into a first cavity and a second cavity;

[0046] Both sides of the mounting frame are provided with a plurality of receiving slots arranged in sequence along the first direction, and the plurality of receiving slots on both sides of the mounting frame are arranged alternately in sequence in the second direction;

[0047] The accommodating groove penetrates the mounting frame along a first direction, and the outer side of the accommodating groove is an opening structure.

[0048] In this embodiment, the shape of the receiving groove is U-shaped, the shape of the coil 2 matches the shape of the receiving groove and is also U-shaped, and the second cavity is a square cavity for accommodating a plurality of PIN needles 5 .

[0049] In this embodiment, the receiving groove is an open structure, and the direction perpendicular to both the first direction and the second direction is recorded as the third direction. The receiving groove with an open structure can allow the coil 2 to be pushed into the receiving groove along the third direction, and the coil 2 is limited by the limiting structure in the receiving groove. It should be noted here that the length direction of the PCB board 4 is the same as the second direction, the width direction of the PCB board 4 is the same as the third direction, and the length direction of the coil 2 is the same as the first direction, that is, the coil 2 is arranged perpendicular to the PCB board 4.

[0050] Of course, in this embodiment, the coil 2 is limited in the installation cavity by the limiting structure, thereby achieving the effect of limiting the PIN needle 5. The purpose of fixing the PIN needle 5 can also be achieved by other forms, for example, a card is installed in the second cavity, the top of the card is in contact with the lower surface of the coil 2, the coil 2 is placed on the card, and a plurality of second grooves are sequentially opened on the two sides of the card along the second direction. The second grooves are arc grooves, and the direction of the length of the second grooves is the same as the first direction. The card adopts a strip plate of plastic material, and the radius of the second groove is equal to the radius of the PIN needle 5, so that the PIN needle 5 can be interference-fitted with the second groove, and the second groove fixes the PIN needle 5. Its purpose does not deviate from the design concept of the utility model and should belong to the protection scope of the utility model.

[0051] According to an embodiment of the present invention, the limiting structure includes a protrusion 11 provided on the inner wall of the accommodating groove and a first groove 6 provided on the outer wall of the coil 2; the protrusion 11 cooperates with the first groove 6 to limit the movement of the coil 2 along the first direction.

[0052] Specifically, Figure 2 and Figure 4 As shown, two protrusions 11 are symmetrically arranged on the side wall of each receiving groove, and two symmetrical first grooves 6 are opened on the coil 2. After the first grooves 6 are aligned with the protrusions 11, the coil 2 is pushed into the receiving groove, thereby limiting the position of the coil 2.

[0053] According to an embodiment of the present utility model, the coil 2 includes a frame 201 and an enameled wire 202, and the enameled wire 202 is wound around the outside of the frame 201;

[0054] A first groove 6 is provided on the outer wall of the lower side of the frame 201;

[0055] Furthermore, the skeleton 201 includes a ring column, and both ends of the ring column are fixedly connected with a ring baffle and a U-shaped seat respectively. A first groove 6 is opened on the outer wall of the U-shaped seat, and the enameled wire 202 is wound around the ring column.

[0056] The provision of the annular baffle and the U-shaped seat can limit the enameled wire 202 between the annular baffle and the U-shaped seat, thereby limiting the position of the enameled wire 202 .

[0057] By pushing the coil 2 into the accommodating groove along the third direction, the protrusion 11 in the accommodating groove is inserted into the first groove 6 opened on the skeleton 201, so that the coil 2 can be limited in the accommodating groove to prevent the coil 2 from moving along the first direction. Since the U-shaped seat in the skeleton 201 is adapted to the accommodating groove, the U-shaped seat can limit the movement of the coil 2 along the second direction.

[0058] Of course, in this embodiment, the limiting structure can also be in other forms, and can also achieve the purpose of limiting the coil 2 to the receiving slot. For example, a first support plate and a second support plate are respectively installed at both ends of each receiving slot. What needs to be known here is that an iron core is installed inside the skeleton 201, and a plurality of first through holes are opened on two opposite sides of the first support plate. The width of the first through hole is greater than the aperture of the iron core and smaller than the size of the skeleton 201. A second through hole is opened on two opposite sides of the second support plate. The width of the second through hole can allow two PIN needles 5 to pass through. The width of the skeleton 201 is greater than the second through hole, which can limit the skeleton 201 to between the first support plate and the second support plate, and the width of the receiving slot is adapted to the width of the skeleton 201, so that the coil 2 will not move along the length direction of the PCB board 4. Its purpose does not deviate from the design concept of the utility model, and therefore, it should belong to the protection scope of the utility model.

[0059] According to an embodiment of the utility model, a second notch 10 is provided on the frame 201 , and the lead of the enameled wire 202 is confined in the second notch 10 , and the lead is wound around the end of the PIN needle 5 and welded to the PIN needle 5 .

[0060] By installing the lead of the enameled wire 202 in the second notch 10, the lead can be protected from damage due to collision and the like. The lead is wound around the PIN needle 5 and then welded, and the PIN needle 5 and the coil 2 are fixed in place, making it easier to weld the PIN needle 5 and the PCB board 4, thereby speeding up the production efficiency of the needle selector.

[0061] The second notch 10 opened on the skeleton 201 is a strip groove, and the groove depth of the strip groove is greater than the diameter of the enameled wire 202. The lead of the enameled wire 202 is placed in the second notch 10, and the lead of the enameled wire 202 is wound around the PIN needle 5 and welded, and then the coil 2 is placed in the U-shaped groove for limiting. At this time, the other end of the PIN needle 5 is stuck in the first notch 7, which is convenient for the subsequent welding of the PIN needle 5 and the PCB board 4. It should be noted here that the notch depth of the second notch 10 is greater than the wire width of the enameled wire 202.

[0062] It should be noted here that when the first notch 7 and the second notch 10 are located on the same vertical plane, the PIN needle 5 is linear, and when the first notch 7 and the second notch 10 are not located on the same vertical plane, the PIN needle 5 is L-shaped.

[0063] According to an embodiment of the present invention, a plurality of plastic latches 8 are fixedly connected to the cover plate 102 , a plurality of mounting holes 9 are formed on the housing 101 , and the plastic latches 8 are interference fit with the mounting holes 9 .

[0064] In this embodiment, the entire housing 101 can be made of plastic injection molding, which has high production efficiency, good thermal conductivity, and high strength, and does not require further processing of the shaft pin hole and the mounting hole 9.

[0065] In this embodiment, after the coil 2 and the PCB board 4 are welded through the PIN needle 5, the cover plate 102 needs to be installed. The original cover plate 102 and the shell 101 are fixed in place by multiple bolts. However, the bolts need to be installed manually one by one. Therefore, when completing this step of assembling the needle selector, the efficiency is low. In this regard, the utility model installs multiple plastic plugs 8 on the cover plate 102, and opens multiple mounting holes 9 on the shell 101. The mounting holes 9 are equal to the plastic plugs 8, so that they can be interference fit, which is convenient for quickly installing the cover plate 102 on the shell 101.

[0066] The plastic latch 8 and the cover plate 102 can be integrally injection molded using plastic material.

[0067] Of course, in this embodiment, the assembly of the cover plate 102 and the housing 101 can also be achieved in other forms, for example, by installing threaded rods on the four corners of the housing 101, installing four bar knobs on the threaded rods, and opening a plurality of bar holes on the cover plate 102. During installation, the bar knobs are passed through the bar holes, and then the bar knobs are twisted to assemble the cover plate 102 and the housing 101. It should be noted here that the length direction of the bar is different from that of the bar hole when it is tightened, and the length direction of each bar hole is different. This assembly method can also achieve the purpose of assembling the housing 101 and the cover plate 102, and its purpose does not deviate from the design concept of the utility model, and therefore belongs to the protection scope of the utility model.

[0068] According to one embodiment of the utility model, the needle selector further includes a cutter head structure 3;

[0069] The cutter head structure 3 includes a metal cutter head 301 and a plastic cutter head mounting portion 302. The metal cutter head 301 and the plastic cutter head mounting portion 302 are integrally injection molded, and the plastic cutter head mounting portion 302 is located in the first cavity;

[0070] The plastic cutter head mounting portion 302 is rotatably connected to the housing 101 via a shaft pin.

[0071] In this embodiment, the two sides of the shell 101 are respectively fixedly connected with side plates 103, and the two side plates 103 are provided with second axial pin holes. Since the original needle selector used a metal cutter head mounting part in the assembly, the first axial pin hole on the metal cutter head mounting part was stamped and formed later. Therefore, when the metal cutter head mounting part is installed between the two side plates 103, the concentricity of the second axial pin hole between the two side plates 103 and the first axial pin hole on the metal cutter head mounting part may deviate. Therefore, it is necessary to take another metal cutter head mounting part for installation, and replace the metal cutter head mounting part. This process leads to reduced production efficiency. Therefore, the utility model adopts the plastic cutter head mounting part 302, and directly injects the first axis pin hole thereof by injection molding, so that the concentricity of the first axis pin hole and the second axis pin hole is not easy to have errors, and there is no need to rework. The production efficiency of the needle selector is improved by replacing the plastic cutter head mounting part 302. Moreover, after the metal cutter head mounting part is replaced with the plastic cutter head mounting part 302, the overall weight of the cutter head structure 3 is reduced. At the highest speed, the cutter head structure 3 swings faster and more stably, and the moment of inertia is reduced, thereby improving the performance of the needle selector.

[0072] Furthermore, a stepped structure is formed at the side panel 103 and the shell 101, and the shell 1 also includes a top cover 104, which is arranged at the first opening. The top cover 104 is provided with a plurality of clearance holes adapted to the metal cutter head 301. The stepped structure can more quickly locate the placement position of the top cover 104, and the top cover 104 can be assembled to the shell 101, thereby improving the production efficiency of the needle selector.

[0073] The two side plates 103 cooperate to close the first cavity, and the top cover 104 is provided with a plurality of holes for the metal blade head 301 to pass through.

[0074] Specifically, the coil 2 also includes an iron core arranged in the skeleton 201, each iron core corresponds to a blade structure 3, and the coil 2 and the PCB board 4 are connected through the PIN needle 5. After the coil 2 is energized, an N pole and an S pole are generated at both ends of the coil 2. According to the principle of like poles repel each other and opposite poles attract each other, the N pole and the S pole of the coil 2 are changed by the on and off direction of the coil 2, thereby controlling the movement of the blade structure 3.

[0075] Overall installation process:

[0076] Step 1: install the iron core into the frame 201, wind the enameled wire 202 onto the frame 201, and insert two leads of the enameled wire 202 into the second notch 10 on the frame 201;

[0077] Step 2: Weld the lead wire of the enameled wire 202 and the PIN needle 5, and assemble the PIN needle 5 and the coil 2;

[0078] Step 3: Place the coil 2 in the U-shaped groove, and the raised portion 11 in the U-shaped groove and the first groove 6 on the coil 2 to limit the position of the coil 2. At this time, the other end of the PIN needle 5 is inserted into the first notch 7 in the PCB board 4, which is convenient for subsequent welding of the PIN needle 5 and the PCB board 4.

[0079] Step 4: Automatically solder the PCB board 4 and the PIN needle 5 by a soldering machine.

[0080] In the description of the present invention, it should be noted that the terms "upper" and "lower" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0081] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of the present utility model, unless otherwise specified, the meaning of "multiple" is two or more.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A needle selector, characterized in that: include: Housing (1), PCB board (4), coil (2) and PIN needle (5); The housing (1) has a mounting cavity therein, and opposite ends of the housing (1) respectively have a first opening and a second opening communicated with the mounting cavity; The coil (2) is installed in the installation cavity through a limiting structure, the lead wire of the coil (2) is welded to one end of the PIN needle (5), the PCB board (4) is provided with a first notch (7), and the other end of the PIN needle (5) is inserted into the first notch (7); The PCB board (4) is mounted on the second opening.

2. A needle selector according to claim 1, characterized in that: The coil (2), the PIN needle (5) and the first notch (7) are provided in plurality, each of the coils (2) comprises two lead wires, one end of each of the PIN needles (5) is welded to one of the lead wires, and the other end thereof is inserted into a corresponding one of the first notches (7); The direction from the first opening to the second opening is a first direction, and the direction perpendicular to the first direction is a second direction; The plurality of coils (2) are arranged in sequence along the second direction.

3. A needle selector according to claim 2, characterized in that: A mounting frame is installed in the mounting cavity, and the mounting frame divides the mounting cavity into a first cavity and a second cavity.

4. A needle selector according to claim 3, characterized in that: Both sides of the mounting frame are provided with a plurality of receiving grooves arranged in sequence along the first direction, and the plurality of receiving grooves on both sides of the mounting frame are arranged alternately in sequence in the second direction; The receiving groove penetrates the mounting frame along a first direction, and the outer side of the receiving groove is an open structure.

5. A needle selector according to claim 4, characterized in that: The limiting structure comprises a protrusion (11) provided on the inner wall of the accommodating groove and a first groove (6) provided on the outer wall of the coil (2); the protrusion (11) cooperates with the first groove (6) to limit the movement of the coil (2) along the first direction.

6. A needle selector according to claim 5, characterized in that: The coil (2) comprises a frame (201) and an enameled wire (202), wherein the enameled wire (202) is wound around the outside of the frame (201); The first groove (6) is provided on the outer wall at the lower side of the frame (201).

7. A needle selector according to claim 6, characterized in that: The skeleton (201) comprises a ring column, the two ends of which are respectively fixedly connected with an annular baffle and a U-shaped seat, the outer wall of the U-shaped seat is provided with the first groove (6), and the enameled wire (202) is wound around the ring column.

8. The needle selector according to claim 6, characterized in that: The frame (201) is provided with a second notch (10), the lead wire of the enameled wire (202) is located in the second notch (10), and the lead wire is wound around the end of the PIN needle (5) and welded to the PIN needle (5).

9. The needle selector according to claim 3, characterized in that: The housing (1) comprises a shell (101) and a cover plate (102); a plurality of plastic plugs (8) are fixedly connected to the cover plate (102); a plurality of mounting holes (9) are provided on the shell (101); and the plastic plugs (8) are interference fit with the mounting holes (9).

10. A needle selector according to claim 9, characterized in that: The needle selector further comprises a cutter head structure (3); The cutter head structure (3) comprises a metal cutter head (301) and a plastic cutter head mounting portion (302); the metal cutter head (301) and the plastic cutter head mounting portion (302) are integrally injection-molded, and the plastic cutter head mounting portion (302) is located in the first cavity; The plastic cutter head mounting portion (302) is rotatably connected to the housing (101) via a shaft pin.

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