Cutting structure and 3D printing equipment for fused deposition

Abstract

The utility model provides a cutting structure which comprises a mounting plate, a swing arm, a first limiting nail, a cutter and a clamping seat, the swing arm is arranged on one side of the mounting plate, the swing arm comprises a first end and a second end, the first limiting nail penetrates through an area between the first end and the second end so that the swing arm can rotate around the first limiting nail, and the cutter comprises a cutter body and a cutting edge. The cutter body is connected to the second end to form an included angle, the cutter body is provided with a through hole, the cutting edge is arranged on the hole wall, away from the second end, of the through hole, the clamping base is provided with a first limiting hole and a second limiting hole which are communicated in a staggered mode, the first limiting hole is opposite to the second end to penetrate through at least one side end of the clamping base, and the second limiting hole penetrates through the top end and the bottom end of the clamping base. The part, provided with the through hole, of the cutter body is slidably arranged in the first limiting hole, and the second limiting hole and the through hole are used for allowing the wire to penetrate through the clamping base. And the cutting-off structure can be used for cutting the wire rod and is beneficial to improving the material returning flexibility. The utility model further provides 3D printing equipment for fused deposition, and the 3D printing equipment is beneficial to solving the technical problem of material returning failure.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printing equipment, and particularly relates to a cutting structure and a 3D printing equipment for fused deposition. Background Art

[0002] At present, in the fused deposition modeling 3D printing process, the material is heated to melt, and the melted material is ejected through a nozzle and stacked layer by layer to complete 3D printing. When the current 3D printing equipment ejects the material, the wire can only be pushed out from the feeding port of the feeding channel by the reverse rotation of the extruder. However, since the wire is heated and melted, the melted end is drawn or the diameter becomes larger, which will affect the material ejection function of the 3D printing equipment. Summary of the Utility Model

[0003] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide a cutting structure that is beneficial to improving the flexibility of material ejection, and the cutting structure can be used for cutting wires.

[0004] In addition, the present application also provides a 3D printing equipment including the cutting structure. Since the cutting structure is introduced into the 3D printing equipment, the 3D printing equipment can solve the technical problem of material ejection failure caused by the enlarged or drawn melted end of the wire.

[0005] To solve the above problems, the technical solutions adopted by the utility model are as follows:

[0006] A cutting structure includes a mounting plate, and further includes:

[0007] A swing arm is arranged on one side of the mounting plate. The swing arm includes a first end and a second end arranged oppositely;

[0008] A first limit pin passes through the area between the first end and the second end along the arrangement direction of the mounting plate and the swing arm, so that the swing arm can rotate around the first limit pin. The first limit pin is installed on the mounting plate;

[0009] A cutter includes a tool body and a cutting edge. The tool body is connected to the second end and is arranged at an angle. The tool body has a through hole exposed at the angle, and the cutting edge is arranged on the hole wall of the through hole far from the second end; and

[0010] A clamping seat is provided with a first limit hole and a second limit hole that intersect and communicate. The first limit hole penetrates at least one side end of the clamping seat relative to the second end, and the second limit hole penetrates the top and bottom ends of the clamping seat. The part of the tool body provided with the through hole is slidably arranged in the first limit hole, and both the second limit hole and the through hole are used for the wire to pass through the clamping seat.

[0011] In some possible implementation manners, the first limit pin is screwed to the mounting plate.

[0012] In some possible implementations, the end surface of the swing arm relative to the mounting plate is recessed to form a groove, the groove is located between the first end and the second end, the first limiting nail passes through the bottom wall of the groove, and the cutting structure further includes:

[0013] A torsion spring, wherein the torsion spring comprises a spring coil and two force arms, each of the first force arms being connected to one end of the spring coil along the torsion direction of the spring coil, the spring coil being arranged in the groove and sleeved on the outside of the first limiting nail, one of the force arms being abutted against the swing arm relative to the first end, and the other of the force arms being connected to the mounting plate.

[0014] In some possible implementations, the mounting plate is provided with an arc-shaped limiting hole, the arc-shaped limiting hole is bent around the first limiting pin, and the cutting structure further includes:

[0015] A second limiting pin, wherein the axial direction of the second limiting pin is parallel to the axial direction of the first limiting pin, the second limiting pin is protruded on the swing arm relative to the mounting plate, and one end of the second limiting pin is movably disposed in the arc-shaped limiting hole relative to the mounting plate.

[0016] In some possible implementations, the second end is recessed relative to the side surface of the card seat to form a receiving groove, and the side wall of the receiving groove away from the first end is protruding with two first clamping arms arranged at intervals, the first clamping arm is arranged between the mounting plate and the other first clamping arm, the first clamping arm and the bottom wall of the receiving groove are spaced apart to form a limiting space, and the first clamping arm and the side wall of the receiving groove close to the first end form a movable channel;

[0017] The knife body includes a first part, a second part and a third part connected in sequence, the first part is fixed in the limiting space, the second part is arranged between the two first clamping arms, the third part is provided with the through hole, and the movable channel is used for the first part to be separated from the accommodating groove.

[0018] In some possible implementations, the blade is a bevel blade, and one end of the blade close to the mounting plate is arranged closer to the second end than the other end.

[0019] In some possible implementations, the blade is an arc-shaped blade, and the arc-shaped blade is bent relative to or away from the second end.

[0020] In some possible implementations, the blade is a V-shaped blade, and the opening of the V-shaped blade is arranged opposite to the second end.

[0021] The present application further provides a 3D printing device for fused deposition, including a thermal melting nozzle. The thermal melting nozzle has a feeding channel. The 3D printing device further includes the cutting structure described above. The thermal melting nozzle is disposed on a side of the first limiting hole away from the first end, and the feeding channel is coaxially arranged with the second limiting hole.

[0022] In some possible embodiments, the second limiting hole has a side opening that at least penetrates through a bottom of the card seat away from the mounting plate. Each of two hole walls of the second limiting hole opposite to or away from the second end is provided with a boss. The thermal melting nozzle is provided with two first card slots, and each of the bosses is disposed in one of the first card slots.

[0023] The 3D printing device further includes:

[0024] Two second card arms. The second card arm includes a first arm portion and a second arm portion. The first arm portion of one second card arm is disposed at an edge of the side opening close to the swing arm, and the first arm portion of the other second card arm is disposed at an edge of the side opening away from the swing arm. The second arm portion, the first arm portion, and the card seat together form a second card slot relative to a top of the card seat; and

[0025] A limiting buckle. The limiting buckle includes a first limiting portion and a second limiting portion. One end of the first limiting portion is rotatably connected to an end of the thermal melting nozzle close to the first limiting hole. The second limiting portion protrudes from opposite ends of the first limiting portion, and a protruding end of the second limiting portion is fixed in each of the second card slots.

[0026] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0027] In the present application, the swing arm is rotatably connected to a first limiting pin mounted on the mounting plate, so that the first end and the second end of the swing arm can swing along different directions. In addition, the card seat is provided with a first limiting hole and a second limiting hole that intersect and communicate with each other. The tool body of the cutter is provided with a through hole, and the cutting edge is disposed on a hole wall of the through hole. Moreover, the second limiting hole and the through hole are for a wire to pass through the card seat. In addition, the cutter is connected to the second end and is slidably disposed in the first limiting hole, so that when the swing arm swings, it can drive the cutter to move to cut the wire passing through the second limiting hole and the through hole, and the cut wire can be moved out of the cutting structure from different directions. Therefore, the cutting structure provided by the present application can cut the wire and is conducive to the cut wire moving out from both ends of the second limiting hole, thereby being conducive to improving the flexibility of wire feeding.

[0028] In the present application, since a cutting structure is introduced into the 3D printing device, the 3D printing device can cut the wire. Thus, when the 3D printing device needs to retract the material, the melted end of the wire can be cut off from the remaining part, and then the remaining part can be returned in place to complete the material retraction operation. Furthermore, the technical problem of material retraction failure of the 3D printing device caused by the enlargement or wire drawing of the melted end of the wire can be solved.

[0029] The following further elaborates on the present utility model in detail in conjunction with the attached drawings and specific embodiments. Description of the Drawings

[0030] Figure 1 It is a usage state diagram of the cutting structure provided by an embodiment of the present application;

[0031] Figure 2 is Figure 1 A partial structural schematic diagram of the cutting structure shown;

[0032] Figure 3 is Figure 1 A structural schematic diagram of the tool shown;

[0033] Figure 4 It is a structural schematic diagram of the tool provided by another embodiment;

[0034] Figure 5 It is a structural schematic diagram of the tool provided by another embodiment;

[0035] Figure 6 It is a structural schematic diagram of the tool provided by another embodiment;

[0036] Figure 7 It is a structural schematic diagram of the tool provided by another embodiment;

[0037] Figure 8 is Figure 1 A structural schematic diagram of the hot melt nozzle shown;

[0038] Figure 9 is Figure 1 A structural schematic diagram of the limit buckle shown.

[0039] Explanation of the reference numerals in the drawings:

[0040] 100 - wire rod; 200 - pushing block; 10 - mounting plate; 101 - arc-shaped limiting hole; 20 - swing arm; 201 - first end; 202 - second end; 21 - groove; 22 - accommodating groove; 23 - first clamping arm; 24 - limiting space; 25 - moving channel; 30 - first limiting pin; 40 - cutting tool, 41 - tool body; 411 - first part; 412 - second part; 413 - third part; 42, 42', 42'', 42''', 42'''' - cutting edge; 401 - through hole; 50 - clamping seat; 501 - first limiting hole; 502 - second limiting hole; 5021 - side opening; 503 - second clamping groove; 51 - second clamping arm; 511 - first arm part; 512 - second arm part; 60 - torsion spring; 61 - spring coil; 62 - force arm; 70 - second limiting pin; 80 - hot melt nozzle; 801 - feeding channel; 802 - limiting groove; 803 - connecting hole; 804 - first clamping groove; 81 - body; 82 - heating element; 90 - boss; 91 - limiting buckle; 911 - first limiting part; 912 - second limiting part; 913 - rotating shaft. Detailed implementation manner

[0041] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0042] The terms "first", "second", etc. in the specification, claims and drawings of the present application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there can also be an intermediate element. When an element is referred to as being "disposed on" another element, it can be disposed on the other element or there can also be an intermediate element.

[0043] Referring to Figure 1 , an embodiment of the present application provides a cutting structure. The cutting structure includes a mounting plate 10, a swing arm 20, a first limiting pin 30, a cutting tool 40 and a clamping seat 50. The swing arm 20 is disposed beside the mounting plate 10. The swing arm 20 includes a first end 201 and a second end 202 which are oppositely arranged. The first limiting pin 30 passes through the area between the first end 201 and the second end 202 along the arrangement direction of the mounting plate 10 and the swing arm 20, so that the swing arm 20 can rotate around the first limiting pin 30. The first limiting pin 30 is mounted on the mounting plate 10. Referring toFigure 3 , the cutting tool 40 includes a tool body 41 and a cutting edge 42. The tool body 41 is connected to the second end 202 and is arranged at an angle. Exemplarily, the tool body 41 can extend along the diameter direction of the first limit pin 30. The tool body 41 has a through hole 401 exposed at the angle, and the cutting edge 42 is arranged on the hole wall of the through hole 401 away from the second end 202. The clamping seat 50 is provided with a first limit hole 501 and a second limit hole 502 that intersect and communicate with each other. The first limit hole 501 penetrates at least one side end of the clamping seat 50 relative to the second end 202, and the second limit hole 502 penetrates the top and bottom ends of the clamping seat 50. The part of the tool body 41 provided with the through hole 401 is slidably arranged in the first limit hole 501, and both the second limit hole 502 and the through hole 401 are used for the wire 100 to pass through the clamping seat 50. Exemplarily, the material of the wire 100 can be a heat-meltable polymer.

[0044] During specific operation, when the push block 200 is moved to apply an external force to push the first end 201 to rotate towards the direction close to the clamping seat 50, the second end 202 rotates away from the clamping seat 50, thereby driving the cutting tool 40 to move synchronously in the first limit hole 501. At this time, the cutting edge 42 can cut the wire 100 passing through the second limit hole 502 and the through hole 401, so as to cut and separate the advancing end (the melting end during 3D printing) of the wire 100 from the remaining part, and further solve the technical problem that the deformation of the advancing end affects the removal of the wire 100 from the cutting structure. After the step of cutting the wire 100 is completed, the first end 201 can rotate away from the clamping seat 50, and correspondingly, the second end 202 rotates in the opposite direction, so that the cutting edge 42 is reset.

[0045] In the present application, the swing arm 20 is rotatably connected to the first limit pin 30 installed on the mounting plate 10, so that the first end 201 and the second end 202 of the swing arm 20 can swing along different directions. In addition, the clamping seat 50 is provided with a first limit hole 501 and a second limit hole 502 that intersect and communicate with each other. The tool body 41 of the cutting tool 40 is provided with a through hole 401, and the cutting edge 42 is arranged on the hole wall of the through hole 401. Moreover, both the second limit hole 502 and the through hole 401 are for the wire 100 to pass through the clamping seat 50. In addition, the cutting tool 40 is connected to the second end 202 and is slidably arranged in the first limit hole 501, so that when the swing arm 20 swings, it can drive the cutting tool 40 to move to cut the wire 100 passing through the second limit hole 502 and the through hole 401, and the cut wire 100 can be removed from the cutting structure in different directions. Therefore, the cutting structure provided by the present application can cut the wire, and is conducive to the cut wire to be removed from both ends of the second limit hole 502, thereby facilitating the improvement of the flexibility of material ejection.

[0046] In some embodiments, the first limit pin 30 is screwed onto the mounting plate 10. The connection of the first limit pin 30 to the threaded hole of the mounting plate 10 through a threaded structure is conducive to improving the convenience of disassembly and assembly of the tool 40. Specifically, after the first limit pin 30 is loosened and detached, the tool 40 can be pulled out of the first limit hole 501 by pulling the swing arm 20. When the tool 40 needs to be reinstalled, the tool 40 is pushed into the first limit hole 501. After aligning the swing arm 20 and the mounting plate 10, the first limit pin 30 is passed through the swing arm 20 and the first limit pin 30 is tightened.

[0047] In some embodiments, referring to Figure 1 , a groove 21 is formed by the end face of the swing arm 20 being recessed relative to the mounting plate 10. The groove 21 is located between the first end 201 and the second end 202, and the first limit pin 30 passes through the bottom wall of the groove 21. The cutting structure further includes a torsion spring 60. The torsion spring 60 includes a spring coil 61 and two force arms 62. Each first force arm 62 is connected to one end of the spring coil 61 along the twisting direction of the spring coil 61. The spring coil 61 is disposed in the groove 21 and sleeved outside the first limit pin 30. One force arm 62 abuts against the swing arm 20 relative to the first end 201, and the other force arm 62 is connected to the mounting plate 10. Exemplarily, the first force arm 62 may include a first force arm portion, a second force arm portion, and a third force arm portion. The second force arm portion may be connected between the first force arm portion and the third force arm portion. The first force arm portion and the third force arm portion are on the same side of the second force arm portion. The first force arm portion is fixed to the spring coil. The third force arm portion of one force arm 62 can be used to abut against the swing arm 20, and the third force arm portion of the other force arm 62 can be inserted into the mounting plate 10, so as to realize the connection of the force arm 62 to the mounting plate 10. The spring coil 61 being disposed in the groove 21 is conducive to reducing the integrated volume of the cutting structure. The addition of the torsion spring 60 to the cutting structure facilitates the automatic reset of the tool 40. Specifically, when the first end 201 rotates in the direction close to the clamping seat 50, the distance between the two force arms 62 of the torsion spring 60 decreases, so that the torsion spring 60 accumulates elastic force. When the external force acting on the first end 201 disappears, the torsion spring 60 releases the elastic force to prompt the first end 201 to rotate in the opposite direction, so that the second end 202 moves in the opposite direction to drive the tool 40 to reset.

[0048] In some embodiments, referring to Figure 1 and Figure 2The mounting plate 10 is provided with an arc-shaped limiting hole 101. Exemplarily, the arc-shaped limiting hole 101 can be a blind hole or a through hole. The arc-shaped limiting hole 101 is bent around the first limiting nail 30. The cutting structure also includes a second limiting nail 70. The axial direction of the second limiting nail 70 is parallel to the axial direction of the first limiting nail 30. The second limiting nail 70 is convexly arranged on the swing arm 20 relative to the mounting plate 10. The second limiting nail 70 is movably arranged in the arc-shaped limiting hole 101 at one end relative to the mounting plate 10. The cooperation between the arc-shaped limiting hole 101 and the second limiting nail 70 can improve the rotational directional stability of the swing arm 20, so that the swing arm 20 can be directional and move in the limiting direction of the arc-shaped limiting hole 101.

[0049] In some embodiments, the second limiting nail 70 is disposed through the swing arm 20 , and the second limiting nail 70 is screwed to the swing arm 20 , thereby facilitating the disassembly and assembly of the second limiting nail 70 .

[0050] In some embodiments, reference Figure 1 The second end 202 is concave relative to the side of the card seat 50 to form a receiving groove 22. The side wall of the receiving groove 22 away from the first end 201 is protruding with two first clamping arms 23 arranged at intervals. The first clamping arm 23 is arranged between the mounting plate 10 and the other first clamping arm 23. The first clamping arm 23 and the bottom wall of the receiving groove 22 are spaced to form a limiting space 24. The first clamping arm 23 and the side wall of the receiving groove close to the first end 201 form a movable channel 25. Combined with reference Figure 3 The blade body 41 includes a first portion 411, a second portion 412 and a third portion 413 connected in sequence, the first portion 411 is fixed in the limiting space 24, the second portion 412 is arranged between the two first clamping arms 23, the third portion 413 is provided with a through hole 401, and the movable channel 25 is used for the first portion 411 to be separated from the receiving groove 22. The structural coordination of the first clamping arm 23, the receiving groove 22 and the blade body 41 is conducive to improving the convenience of disassembly and assembly of the tool 40, and is also conducive to ensuring the connection stability between the tool 40 and the swing arm 20. Specifically, after the first limiting nail 30 is removed, the first portion 411 can be moved from the limiting space 24 to the movable channel 25, so that the first portion 411 can be removed from the movable channel 25 to realize the removal of the tool 40. On the contrary, when assembling the tool 40, the first portion 411 can be moved from the movable channel 25 into the limiting space 24, the second portion 412 is arranged between the two first clamping arms 23, and then the first limiting nail 30 can be installed.

[0051] In some embodiments, reference Figure 1 and Figure 3 The blade 42 is a bevel blade, and one end of the blade 42 close to the mounting plate 10 is arranged closer to the second end 202 than the other end. The structural arrangement of the blade 42 is conducive to improving cutting efficiency.

[0052] In some embodiments, in conjunction with reference Figure 1 ,Figure 4 and Figure 5 The cutting edge 42' is an arc-shaped cutting edge, and the arc-shaped cutting edge is bent relative to the second end 202. The cutting edge 42'' is an arc-shaped cutting edge, and the arc-shaped cutting edge is bent away from the second end 202. The arc-shaped cutting edge is beneficial to improving the cutting efficiency.

[0053] In some embodiments, with reference to Figure 1 and Figure 6 the cutting edge 42''' is a V-shaped cutting edge, and the opening of the V-shaped cutting edge is arranged relative to the second end 202. Similarly, the cutting edge of the V-shaped cutting edge is beneficial to improving the cutting efficiency.

[0054] In other embodiments, with reference to Figure 1 and Figure 7 the shape of the cutting edge 42'''' can be changed. Exemplarily, the cutting edge 42'''' can be a straight cutting edge, and the cutting edge 42'''' can be arranged parallel to the axial direction of the first limiting pin 30.

[0055] With reference to Figure 1 Another embodiment of the present application further provides a 3D printing device for fused deposition, hereinafter referred to as a 3D printing device. The 3D printing device includes a hot melt nozzle 80 and a cutting structure. With reference to Figure 8 the hot melt nozzle 80 has a feed channel 801. The hot melt nozzle 80 is arranged on the side of the first limiting hole 501 away from the first end 201, and the feed channel 801 is coaxially arranged with the second limiting hole 502. Specifically, the wire 100 is inserted into the second limiting hole 502 from the side of the second limiting hole 502 away from the hot melt nozzle 80, passes through the through hole 401 of the cutter 40 in the first limiting hole 501, and then is inserted into the feed channel 801. The hot melt nozzle 80 operates to melt the wire 100, and the melted wire 100 can be extruded from the hot melt nozzle 80.

[0056] In the present application, since the 3D printing device introduces a cutting structure, the 3D printing device can cut the wire 100. Thus, when the 3D printing device needs to retract the material, the melted end of the wire 100 can be cut off from the remaining part, and then the remaining part can be returned in place to complete the retraction operation, thereby being able to solve the technical problem of the failure of the 3D printing device to retract the material caused by the enlargement or wire drawing of the melted end of the wire 100.

[0057] It can be understood that a driving assembly including gears can be installed in the hot melt nozzle 80 to push the wire 100 to move, or the wire 100 can be pushed in cooperation with a manipulator. The above ways of moving the wire are all prior arts, so the specific structural cooperation will not be described in detail.

[0058] In some embodiments, with reference to Figure 1 and Figure 2The second limiting hole 502 has a side opening 5021, and the side opening 5021 at least penetrates the bottom of the side of the holder 50 away from the mounting plate 10. The two hole walls of the second limiting hole 502 opposite to or away from the second end 202 are each provided with a boss 90, and the hot melt nozzle 80 is provided with two first slots 804 (refer to Figure 8 ), each boss 90 is disposed in a first slot 804. The 3D printing device also includes two second arms 51 and a limit buckle 91. The second arm 51 includes a first arm portion 511 and a second arm portion 512. The first arm portion 511 of one second arm 51 is disposed at an edge of the side opening 5021 close to the swing arm 20, and the first arm portion 511 of the other second arm 51 is disposed at an edge of the side opening 5021 away from the swing arm 20. The second arm portion 512, the first arm portion 511 and the holder 50 together form a second slot 503 relative to the top of the holder 50. Figure 9 The limiting buckle 91 includes a first limiting portion 911 and a second limiting portion 912. One end of the first limiting portion 911 is rotatably connected to one end of the hot melt nozzle 80 close to the first limiting hole 501. The second limiting portion 912 is convexly disposed at opposite ends of the first limiting portion 911. A convex end of the second limiting portion 912 is fixed in each second slot 503.

[0059] Exemplarily, the number of the second limiting portion 912 may be one or two. When the number of the second limiting portion 912 is one, the second limiting portion 912 may be disposed through the first limiting portion 911, so that the two ends of the second limiting portion 912 are respectively protruded at the opposite ends of the first limiting portion 911. When the number of the second limiting portion 912 is two, each second limiting portion 912 may be overlapped on one of the oppositely disposed end surfaces of the first limiting portion 911.

[0060] The cooperation of the side opening 5021, the boss 90, the first slot 804, the second slot 503 and the limit buckle 91 is conducive to improving the convenience of disassembly and assembly of the hot melt nozzle 80, while ensuring the connection stability. In specific use, the first limit part 911 can be rotated to make the second limit part 912 disengage from the second slot 503, and then the hot melt nozzle 80 is moved away from the mounting plate 10 to release the clamping of the boss 90 and the first slot 804, so that the hot melt nozzle 80 can be removed.

[0061] For example, refer to Figure 1 , Figure 8 ,and Figure 9, a side surface of the hot melt nozzle 80 may be recessed to form a limiting groove 802. Connection holes 803 may be provided on both side walls of the limiting groove 802 close to or away from the swing arm 20. The first limiting portion 911 may protrude from a rotating shaft 913. One protruding end of the rotating shaft 913 may be installed in each connection hole 803, and the protruding end may rotate in the connection hole, so as to realize that one end of the first limiting portion 911 is rotatably connected to the hot melt nozzle 80. In another embodiment, the rotating shaft 913 may be provided on the side wall of the limiting groove 802, and the connection hole 803 may be provided on the first limiting portion 911, so as to realize that one end of the first limiting portion 911 is rotatably connected to the hot melt nozzle 80. It can be understood that the rotational connection can also be achieved by other means.

[0062] Exemplarily, referring to Figure 8 , the hot melt nozzle 80 may include a body 81 and a heating element 82. The heating element 82 may be fixed to the outer surface of the body 81 to heat the wire 100 by the hot melt nozzle 80, and the body 81 has a feeding channel 801. The heating element 82 may include a ceramic heating sheet, and the heating function of the heating element 82 may be realized by energizing the heating sheet.

[0063] The above embodiments are only the preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby. Any non-substantial changes and substitutions made by those skilled in the art on the basis of the present invention fall within the protection scope required by the present invention.

Claims

1. A cutting structure, comprising a mounting plate, characterized in that, Also includes: A swing arm is disposed on one side of the mounting plate, and the swing arm includes a first end and a second end that are disposed opposite to each other; A first limiting pin passes through the area between the first end and the second end along the arrangement direction of the mounting plate and the swing arm, so that the swing arm can rotate around the first limiting pin, and the first limiting pin is installed on the mounting plate; A tool, comprising a tool body and a blade, wherein the tool body is connected to the second end to form an angle, the tool body has a through hole exposed at the angle, and the blade is arranged on a hole wall of the through hole away from the second end; and The base is provided with a first limiting hole and a second limiting hole that are interlaced and connected. The first limiting hole passes through at least one side end of the base relative to the second end, and the second limiting hole passes through the top and bottom ends of the base. The part of the knife body provided with the through hole can be slidably arranged in the first limiting hole, and the second limiting hole and the through hole are both used for allowing the wire to pass through the base.

2. The cutting structure according to claim 1, characterized in that, The first limiting nail is screwed to the mounting plate.

3. The cutting structure according to claim 1 or 2, characterized in that The end surface of the swing arm relative to the mounting plate is recessed to form a groove, the groove is located between the first end and the second end, the first limiting nail passes through the bottom wall of the groove, and the cutting structure further includes: A torsion spring, the torsion spring comprises a spring coil and two force arms, each of the force arms is connected to one end of the spring coil along the torsion direction of the spring coil, the spring coil is arranged in the groove and sleeved on the outside of the first limiting nail, one of the force arms is abutted against the swing arm relative to the first end, and the other of the force arms is connected to the mounting plate.

4. The cutting structure according to claim 3, wherein, The mounting plate is provided with an arc-shaped limiting hole, and the arc-shaped limiting hole is bent around the first limiting nail, and the cutting structure further includes: A second limiting pin, wherein the axial direction of the second limiting pin is parallel to the axial direction of the first limiting pin, the second limiting pin is protruded on the swing arm relative to the mounting plate, and one end of the second limiting pin is movably disposed in the arc-shaped limiting hole relative to the mounting plate.

5. The cutting structure according to claim 2, characterized in that The second end is recessed relative to the side surface of the card seat to form a receiving groove, and the side wall of the receiving groove away from the first end is protruding with two first clamping arms arranged at intervals, the first clamping arm is arranged between the mounting plate and the other first clamping arm, the first clamping arm and the bottom wall of the receiving groove are spaced apart to form a limiting space, and the first clamping arm and the side wall of the receiving groove close to the first end form a movable channel; The knife body includes a first part, a second part and a third part connected in sequence, the first part is fixed in the limiting space, the second part is arranged between the two first clamping arms, the third part is provided with the through hole, and the movable channel is used for the first part to be separated from the accommodating groove.

6. The cutting structure according to claim 1, characterized in that, The blade is a bevel blade, and one end of the blade close to the mounting plate is arranged closer to the second end than the other end.

7. The cutting structure according to claim 1, wherein The blade is an arc-shaped blade, and the arc-shaped blade is bent relative to or away from the second end.

8. The cutting structure according to claim 1, wherein, The blade is a V-shaped blade, and the opening of the V-shaped blade is arranged opposite to the second end.

9. A 3D printing device for fused deposition, comprising a hot melt nozzle, the hot melt nozzle having a feed channel, characterized in that, The 3D printing device also includes the cutting structure described in any one of claims 1 to 8, the hot melt nozzle is arranged on a side of the first limiting hole away from the first end, and the feed channel is coaxially arranged with the second limiting hole.

10. The 3D printing device according to claim 9, characterized in that, The second limiting hole has a side opening, and the side opening at least passes through the bottom of one side of the holder away from the mounting plate, and two hole walls of the second limiting hole opposite to or away from the second end are respectively provided with a boss, and the hot melt nozzle is provided with two first slots, and each of the bosses is provided in one of the first slots; The 3D printing device also includes: two second clamping arms, the second clamping arms comprising a first arm portion and a second arm portion, the first arm portion of one second clamping arm being arranged at an edge of the side opening close to the swing arm, the first arm portion of the other second clamping arm being arranged at an edge of the side opening away from the swing arm, the second arm portion, the first arm portion and the clamping seat jointly forming a second clamping slot relative to the top of the clamping seat; and The limiting buckle includes a first limiting portion and a second limiting portion, one end of the first limiting portion is rotatably connected to an end of the hot melt nozzle close to the first limiting hole, the second limiting portion is protruded at the opposite ends of the first limiting portion, and a protruding end of the second limiting portion is fixed in each of the second card slots.

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