Anti-torsion quick-change type printing head structure and 3D printer

Abstract

The utility model discloses a kind of anti-torsion quick-change type print head structure and 3D printer, the anti-torsion quick-change type print head structure, for printing consumables, including sequentially communicating connection's radiator, throat pipe, heating block and nozzle along first direction, throat pipe both ends are respectively threaded in radiator and heating block, nozzle is set in the one end of heating block away from radiator, further include limiting component, limiting component includes connecting plate, connecting shaft;Connecting plate fixedly sleeved in the outer periphery of heating block, installation groove is set on the first end of radiator, connecting plate is at least partly located in installation groove, the first end of radiator is fixedly connected with the connecting plate part being placed in installation groove by the connecting shaft being set in second direction;The utility model can solve the problem that the traditional print head anti-torsion structure is inconvenient to disassemble and assemble, and the heating block of print head needs to be set to larger volume to accommodate locking screw, thereby affecting the heating efficiency of consumables.

Description

Technical Field

[0001] This utility model relates to the field of printheads, specifically to an anti-torsion quick-change printhead structure and a 3D printer. Background Technology

[0002] The basic principle of a 3D printer is that a motor drives an extrusion wheel, feeding filaments as filaments. These filaments pass through a heat sink and a throat, where they are heated and melted into micron-sized filaments, ultimately being ejected from the nozzle. Following a 3D model, these filaments are accumulated, solidified, and shaped to form a physical part. The print head is fixedly mounted on the printer. When the nozzle is removed or installed, other structures in the print head, such as the throat and heating element, may rotate. To prevent this rotation, an anti-torsion structure must be installed between the heating element and the heat sink.

[0003] Traditional printhead anti-torsion structures use longitudinal screws parallel to the throat axis for locking connections. Typically, the stress points of these screws between the heating element and the heat sink are far from the stress point. To prevent deformation and torsional instability, multiple fixing screws are often required. This structure requires removing 3-4 screws simultaneously during disassembly, and tightening them synchronously to prevent the heating element from tilting, resulting in inconvenient assembly and disassembly. Furthermore, using screws for locking requires a larger heating element to accommodate the screws, which can affect the heating efficiency of the consumables. Utility Model Content

[0004] The present invention aims to solve the above-mentioned technical problems, namely, that the traditional printhead anti-torsion structure is inconvenient to disassemble and assemble, and the heating block of the printhead needs to be set to a larger volume to accommodate the locking screw, which affects the heating efficiency of the consumables. To this end, the present invention provides a printhead structure that is easy to disassemble and assemble, has good anti-torsion stability, and improves the heating efficiency of the printhead for consumables.

[0005] In a first aspect, this utility model provides a torsion-resistant quick-change printhead structure for printing consumables, comprising a heat sink, a throat, a heating block, and a nozzle connected sequentially along a first direction. The two ends of the throat are respectively inserted into the heat sink and the heating block. The nozzle is disposed at the end of the heating block away from the heat sink. The structure also includes a limiting component, which includes a connecting plate and a connecting shaft. The connecting plate is fixedly sleeved on the outer periphery of the heating block. A mounting groove is provided on the first end of the heat sink. The connecting plate is at least partially disposed in the mounting groove. The first end of the heat sink is fixedly connected to the connecting plate portion placed in the mounting groove via a connecting shaft disposed in a second direction.

[0006] This application uses a connecting shaft to radially fix the connecting plate and the heat sink along the throat, transforming the linear force of the traditional axial screw into radial torsional force, which significantly improves the torsional strength (can withstand greater torque). At the same time, it eliminates the need for multiple locking screws that surround the heating block, avoiding the increase in the volume of the heating block due to the screws, reducing ineffective heat capacity, ensuring that heat is concentrated on the melting zone of the consumables, and improving the energy efficiency ratio.

[0007] In the preferred embodiment of the above-mentioned anti-torsion quick-change printhead structure, the connecting plate is detachably and fixedly sleeved onto the heating block by fasteners.

[0008] In the preferred embodiment of the above-mentioned anti-torsion quick-change printhead structure, the connecting plate has a through first hole along the first direction for fitting onto the outer periphery of the heating block, and the connecting plate has a through second hole communicating with the first hole along the throat diameter direction. The fastener is a threaded bolt that passes through the second hole and abuts against the heating block.

[0009] In the preferred embodiment of the above-mentioned anti-torsion quick-change printhead structure, the heat sink includes a base with a through channel and a heat sink extending outward from the peripheral wall of the base; at the first end of the heat sink, the heat sink has at least one through first slot along the second direction, the connecting plate has a through second slot corresponding to the first slot along the second direction, and the connecting shaft passes through the first slot and the second slot.

[0010] In the preferred embodiment of the above-mentioned anti-torsion quick-change printhead structure, at least a portion of the heat sink with a first slot at the first end of the heat sink is configured to extend from the outer peripheral wall of the substrate along a first direction and continuously move away from the substrate in a third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other; after the connecting plate is connected to the heat sink with the first slot via a connecting shaft, the connecting plate is not in contact with the heat sink, and the connecting plate, the heating block, and the through channel of the substrate are spaced apart.

[0011] In the preferred embodiment of the above-mentioned anti-torsion quick-change printhead structure, the connecting shaft forms an interference fit with the first slot and the second slot.

[0012] In the preferred embodiment of the above-mentioned anti-torsion quick-change printhead structure, the heating block includes a boss with a locking surface, and the inner wall of the first hole of the connecting plate is provided with a torque transmission surface that cooperates with the locking surface.

[0013] In the preferred embodiment of the above-mentioned anti-torsion quick-change printhead structure, a locking structure for pressing the throat tube against the heat sink body is further included. The locking structure includes at least a set screw and a pad. The heat sink body has a locking channel communicating with the through channel for installing the locking structure along the radial direction of the through channel. The throat tube extends into the through channel, and the pad is pressed against the outer periphery of the throat tube. Along the radial direction of the throat tube, the set screw can rotate on the internal threads of the heat sink body and the pad to press the pad against the throat tube.

[0014] In the preferred embodiment of the above-mentioned anti-torsion quick-change printhead structure, the side surface of the block that contacts the throat is configured to have a shape adapted to the outer peripheral surface of the throat.

[0015] In a second aspect, the present invention also provides a 3D printer, which includes the aforementioned anti-torsion quick-change printhead structure. Attached Figure Description

[0016] Figure 1 This is the front view of the present invention; Figure 2 This is a schematic diagram showing the heat sink and heating block after separation. Figure 3 This is a cross-sectional view of the present invention; Figure 4 This is a bottom view of the heat sink; Figure 5 This is a schematic diagram showing the connection between the connecting plate and the heating block; Figure 6 This is a structural schematic diagram of the connecting plate; Figure 7 This is a schematic diagram of the heating block structure; In the figure: 1. Heat sink, 11. Mounting slot, 12. Through channel, 121. Heat sink, 13. First slot, 131. Locking channel, 14. Throat, 2. Heating block, 3. Boss, 31. Locking surface, 311. Nozzle, 4. Connecting plate, 51. First hole, 511. Torque transmission surface, 5111. Second hole, 512. Second slot, 513. Connecting shaft, 52. Fastener, 6. Set screw, 71. Cover block, 72. First direction X, second direction Y, third direction Z. Detailed Implementation

[0017] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0018] It should be noted that in the description of this utility model, terms such as "upper," "lower," "left," "right," "front," and "rear," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0020] like Figures 1 to 7 As shown, the anti-torsion quick-change printhead structure of this utility model is used for printing consumables. It includes a heat sink 1, a throat 2, a heating block 3, and a nozzle 4 connected sequentially along a first direction. The two ends of the throat 2 are respectively inserted into the heat sink 1 and the heating block 3. The nozzle 4 is located at the end of the heating block 3 away from the heat sink 1. It also includes a limiting component, which includes a connecting plate 51 and a connecting shaft 52. The connecting plate 51 is fixedly sleeved on the outer periphery of the heating block 3. A mounting groove 11 is opened on the first end of the heat sink 1. The connecting plate 51 is at least partially located in the mounting groove 11. The first end of the heat sink 1 is partially fixedly connected to the connecting plate 51 placed in the mounting groove 11 by the connecting shaft 52 arranged in a second direction.

[0021] See Figure 1 The first direction X is the axial direction of the throat 2 from top to bottom, and the second direction Y is perpendicular to the first direction X.

[0022] See Figure 1 , Figure 2 The heat sink 1, the throat 2, the heating block 3, and the nozzle 4 are arranged sequentially along the first direction X. Based on existing technology, it is known that the connected heat sink 1, throat 2, heating block 3, and nozzle 4 have a through channel for conveying printing consumables along the first direction X. No specific details are given here. The nozzle 4 is installed at the bottom end of the heating block 3. The two ends of the throat 2 are respectively inserted into the heat sink 1 and the heating block 3, and the heat sink 1 and the heating block 3 are separated by the throat 2. This is conducive to the heat dissipation of consumables inserted into the heat sink 1 and above within the heat dissipation area formed by the heat sink 1, and reduces the possibility of the consumables softening within the heat dissipation area.

[0023] It should be noted that traditional printheads with anti-torque function usually use multiple fixing screws to fix the heat sink 1 and the heating block 3 along the axial direction parallel to the throat tube 2, so that when the printhead is anti-torque, the fixing screws are subjected to axial force.

[0024] In this application, a limiting assembly is used to fix the heat sink 1 and the heating block 3. The limiting assembly includes a connecting plate 51 and a connecting shaft 52. The connecting plate 51 is fixedly sleeved on the outer periphery of the heating block 3, and the connecting shaft 52 is used to pass through the connecting plate 51 and the heat sink 1 along the second direction Y, thereby realizing the fixed connection between the heat sink 1 and the heating block 3 through the connecting plate 51 and the connecting shaft 52. Specifically, the heat sink 1 has a first end and a second end. The first end has a mounting groove 11 along the second direction Y. After the heat sink 1, the connecting plate 51, the throat 2, the heating block 3 and the nozzle 4 are assembled along the first direction X, the connecting plate 51 is at least partially located in the mounting groove 11 at the first end of the heat sink 1, utilizing the second direction Y. The connecting shaft 52, which is set in the Y direction, passes through the connecting plate 51 and the first end of the heat sink 1, so that the heat sink 1 can be fixedly connected to the heating block 3 through the connecting plate 51 and the connecting shaft 52. In this application, the heat sink 1 is connected and fixed to the connecting plate 51 by the connecting shaft 52 set in the second direction Y, so that when the print head is under torsion, the connecting shaft 52 is radially stressed. Compared with the traditional axially stressed print head fixed by screws, the radially stressed print head of this application has better torsion resistance and can withstand greater torque. It avoids meeting the torsion resistance requirement by increasing the number of fixing screws. In addition, it can avoid the problem of increasing the volume of the heating block due to the need to accommodate screws, which would affect the heating effect of the heating block 3 on the consumables.

[0025] In one or more embodiments, the connecting plate 51 is detachably and securely fitted onto the heating block 3 by fasteners 6.

[0026] See Figures 1 to 3 , Figures 5 to 7 By setting the connecting plate 51 to be detachably mounted on the heating block 3 by means of fastener 6, it is possible to achieve a separate connection between the connecting plate 51 and the heating block 3, and a separate connection between the connecting plate 51 and the heat sink 1. When the throat 2, heating block 3, and nozzle 4 need to be replaced, the connecting plate 51 and heating block 3 can be separated by fastener 6 without replacing the matching connecting plate 51 and heat sink 1, thus reducing replacement costs. When the heat sink 1 needs to be replaced, the connecting shaft 52 or fastener 6 can be disassembled and installed without replacing the matching heating block 3 and nozzle 4.

[0027] In one or more embodiments, the connecting plate 51 has a through first hole 511 along the first direction X for fitting around the outer periphery of the heating block 3, and the connecting plate 51 has a through second hole 512 along the radial direction of the throat 2 that communicates with the first hole 511. The fastener 6 is a threaded bolt that passes through the second hole 512 and abuts against the heating block 3.

[0028] See Figure 2 , Figures 5 to 7 A first hole 511 is provided in the middle of the connecting plate 51, extending through the first direction X. A second hole 512 is provided on the side of the connecting plate 51, extending through and connecting the first hole 511 in the radial direction. The second hole 512 is a screw hole. The cross-sections of the first hole 511 and the second hole 512 are approximately T-shaped. The connecting plate 51 is sleeved on the heating block 3 through the first hole 511. The fastener 6 is a fastening bolt that can be adapted to the second hole 512. The fastening bolt can be screwed through the second hole 512 to enter the first hole 511 and abut against the surface of the heating block 3.

[0029] In one or more embodiments, the heat sink 1 includes a base 12 with a through channel 121 and a heat sink 13 extending outward from the peripheral wall of the base 12; at the first end of the heat sink 1, the heat sink 13 has at least one through first slot 131 along the second direction, and the connecting plate 51 has a through second slot 513 corresponding to the first slot 131 along the second direction Y, and the connecting shaft 52 passes through the first slot 131 and the second slot 513.

[0030] See Figures 1 to 4 The heat sink 1 includes a base 12 and a plurality of heat sinks 13. The plurality of heat sinks 13 are mounted on the base 12 and extend in the circumferential direction through the outer wall of the base 12. The heat sink 13 at the first end of the heat sink 1 has a mounting groove 11 for accommodating the connecting plate 51. The heat sink 13 has at least one first slot 131 through the mounting groove 11 along the second direction Y.

[0031] See Figure 5 The portion of the connecting plate 51 placed in the mounting groove 11 of the heat sink 1 has a through second slot 513 along the second direction Y. The second slot 513 is coaxial with the first slot 131. The connecting shaft 52 passes through the first slot 131 and the second slot 513 along the second direction Y to radially fix the connecting plate 51 and the heat sink 1, thereby realizing the assembly and fixation of the heat sink 1 and the heating element through the connecting plate 51.

[0032] See Figure 2 , Figure 4 , Figure 5At the first end of the heat sink 1, the heat sink 13 on both sides of the base 12 is provided with a first slot 131 along the second direction Y. The connecting plate 51 is provided with a second through slot 513 on both sides along the second direction Y, corresponding to the first slot 131. Two connecting shafts 52 are respectively provided on both sides of the throat 2. Each connecting shaft 52 passes through the corresponding first slot 131 and second slot 513 to connect the connecting plate 51 and the heat sink 1.

[0033] This application achieves the assembly and fixation of the heat sink 1 and the heating element by opening a first slot 131 through the heat sink 13 at the first end of the heat sink 1 along the second direction Y, opening a second slot 513 through the part of the connecting plate 51 placed in the mounting groove 11 along the second direction Y, and passing a connecting shaft 52 through the first slot 131 and the second slot 513. With this arrangement, the volume of the heating block 3 in the print head can be saved, the heating efficiency of the heating block 3 can be improved, and the heat loss of the heating block 3 can be reduced. In addition, it can avoid the problem of fixing the heat sink 1 to the heating block 3 with screws arranged along the axial direction, which would occupy a large space and affect the heat dissipation of the heat sink 13 of the heat sink 1.

[0034] In one or more embodiments, at least a portion of the heat sink 13 with a first slot 131 located at the first end of the heat sink 1 is configured to extend from the outer peripheral wall of the base 12 along the first direction X and continuously move away from the base 12 in the third direction Z, wherein the first direction X, the second direction Y, and the third direction Z are perpendicular to each other; after the connecting plate 51 is connected to the heat sink 13 with the first slot 131 through the connecting shaft 52, the connecting plate 51 is not in contact with the heat sink 1, and the connecting plate 51, the heating block 3 and the through channel 121 of the base 12 are spaced apart.

[0035] See Figures 1 to 4 In the vertical direction from the second end to the first end of the heat sink 1, the heat sink 13 on the heat sink 1 extends outward in an approximately horizontal manner. The heat sink 13 at the first end of the heat sink 1 is configured to extend from the outer peripheral wall of the base 12 along the first direction X and continuously move away from the base 12 in the third direction Z. The heat sink 13 has a mounting groove 11 for accommodating the connecting plate 51 and a first slot 131 that penetrates along the second direction Y. When the connecting shaft 52 passes through the first slot 131 of the heat sink 13 and the second slot 513 of the connecting plate 51, the connecting plate 51 is not in contact with the heat sink 1. An arched partition space is formed between the top surface of the connecting plate 51 and the bottom surface of the first end of the heat sink 1. This partition space separates the consumable heating area from the consumable heat dissipation area, which is beneficial for the heat dissipation of the consumable in the heat dissipation area and reduces the possibility of the consumable in the heat dissipation area softening.

[0036] It is understandable that, such as Figures 1 to 4The first end of the heat sink 1 is the bottom end of the heat sink 1. After the connecting plate 51 is connected to the heat sink 1 through the connecting shaft 52, there are gaps between the heat sink 1 and the connecting plate 51 in the first direction X, the second direction Y, and the third direction Z so that they do not contact each other, thereby reducing the heat on the heating block 3 from being transferred to the heat sink 1 through the connecting plate 51.

[0037] In one or more embodiments, the connecting shaft 52 forms an interference fit with the first slot 131 and the second slot 513.

[0038] See Figures 1 to 4 The mounting groove 11 of the heat sink 13 located at the first end of the heat sink 1 is generally concave. The part of the connecting plate 51 with the second slot 513 is placed in the mounting groove 11, so that the first slot 131 and the second slot 513 are coaxial. At this time, the connecting shaft 52 is configured to have an interference fit with the first slot 131 and the second slot 513. For example, the connecting shaft 52 is a screw, and the first slot 131 and the second slot 513 are threaded holes adapted to the screw. For example, the connecting shaft 52 is a pin, and the first slot 131 and the second slot 513 are pin holes adapted to the pin, etc.

[0039] In one or more embodiments, the heating block 3 includes a boss 31 with a locking surface 311, and the inner wall of the first hole 511 of the connecting plate 51 is provided with a torque transmission surface 5111 that cooperates with the locking surface 311.

[0040] See Figure 2 , Figures 5 to 7 The heating block 3 has an upwardly extending boss 31 at its top. The shape of the boss 31 is adapted to the inner wall of the first hole 511 of the connecting plate 51. It can be understood that the locking surface 311 is the outer peripheral surface of the boss 31. The locking surface 311 of the boss 31 is a non-cylindrical surface. The locking surface 311 of the boss 31 can be a combination of a plane and an arc surface, or at least three adjacent planes, etc. The torque transmission surface 5111 provided on the inner wall of the first hole 511 of the connecting plate 51 is adapted to the locking surface 311 of the boss 31, so that after the boss 31 enters the first hole 511 of the connecting plate 51, the connecting plate 51 is locked by the boss 31 and will not rotate circumferentially relative to the boss 31. At the same time, the size of the first hole 511 can be controlled by controlling the size of the boss 31, reducing the radial width of the connecting plate 51 and reducing the amount of material used in the connecting plate 51.

[0041] It is understandable that when the fastener 6 is a fastening bolt, the heating block 3 has a recess that is adapted to the fastening bolt at the abutment point. Specifically, the boss 31 has a recess at the abutment point of the fastening bolt, and the fastening bolt passes through the second hole 512 and abuts against the recess.

[0042] In one or more embodiments, a locking structure for pressing the throat 2 against the heat sink 1 is also included. The locking structure includes at least a set screw 71 and a block 72. The heat sink 1 has a locking channel 14 for installing the locking structure that communicates with the through channel 121 along the radial direction of the through channel 121. The throat 2 extends into the through channel 121, and the block 72 is pressed against the outer periphery of the throat 2. Along the radial direction of the throat 2, the set screw 71 can rotate internally in the heat sink 1 and the block 72 to press the block 72 against the throat 2.

[0043] See Figures 1 to 4 The locking structure includes a set screw 71 and a block 72. Along the radial direction of the through channel 121 of the heat sink 1, a locking channel 14 is provided in the heat sink 1, which is connected to the through channel 121. The locking channel 14 is used to install the block 72 and the set screw 71. The set screw 71 can be screwed forward in the locking channel 14 to abut against the block 72 and push the block 72 toward the through channel 121. Then, the surface of the block 72 near the through channel 121 abuts against the outer wall of the throat 2 inserted into the through channel 121, thereby fixing the throat 2 in the heat sink 1. By controlling the forward or backward movement of the set screw 71 in the locking channel 14, the restriction on the throat 2 can be controlled, including tightening or loosening, so as to realize the separate assembly structure of the throat 2 and the heat sink 1. When replacing the heating block 3 nozzle 4, it is not necessary to replace the matching heat sink 1, thus reducing the replacement cost.

[0044] It is understandable that the block 72 has a second recess corresponding to the contact point of the set screw 71, and the set screw 71 is screwed into the second recess after being abutted.

[0045] In one or more embodiments, the side surface of the block 72 that contacts the throat 2 is configured to have a shape adapted to the outer peripheral surface of the throat 2. See also Figure 2 , Figure 3 The throat tube 2 is roughly cylindrical in shape, and its outer surface is arc-shaped. The side surface of the block 72 that can come into close contact with the throat tube 2 is configured as an arc-shaped surface to fit the throat tube 2, thereby reducing the damage to the throat tube 2 when the block 72 comes into close contact with the throat tube 2. At the same time, it can increase the friction between the two and improve the pressing effect of the block 72 on the throat tube 2.

[0046] In addition, this utility model also provides a 3D printer having the anti-torsion quick-change printhead structure in any of the above embodiments.

[0047] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They cannot be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A torsion-resistant quick-change printhead structure for printing consumables, characterized in that, The device includes a heat sink, a throat, a heating block, and a nozzle connected sequentially along a first direction. The two ends of the throat are respectively inserted into the heat sink and the heating block. The nozzle is located at the end of the heating block away from the heat sink. The device also includes a limiting component, which includes a connecting plate and a connecting shaft. The connecting plate is fixedly sleeved on the outer periphery of the heating block. A mounting groove is formed on the first end of the heat sink. The connecting plate is at least partially disposed in the mounting groove. The first end of the heat sink is fixedly connected to the connecting plate portion placed in the mounting groove via a connecting shaft arranged in a second direction.

2. The anti-torsion quick-change printhead structure according to claim 1, characterized in that: The connecting plate is detachably and securely fitted onto the heating block by fasteners.

3. The anti-torsion quick-change printhead structure according to claim 2, characterized in that: The connecting plate has a through hole along the first direction for fitting onto the outer periphery of the heating block. The connecting plate also has a through hole along the throat diameter direction that communicates with the first hole. The fastener is a threaded bolt that passes through the second hole and abuts against the heating block.

4. The anti-torsion quick-change printhead structure according to claim 1, characterized in that: The heat sink includes a base with a through channel and heat sinks extending outward from the peripheral wall of the base; at the first end of the heat sink, the heat sink has at least one through first slot along a second direction, the connecting plate has a through second slot corresponding to the first slot along the second direction, and the connecting shaft passes through the first slot and the second slot.

5. The anti-torsion quick-change printhead structure according to claim 4, characterized in that: At least a portion of the heat sink with a first slot at the first end of the heat sink is configured to extend from the outer peripheral wall of the substrate along a first direction and continuously move away from the substrate in a third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other; after the connecting plate is connected to the heat sink with the first slot via a connecting shaft, the connecting plate is not in contact with the heat sink, and the connecting plate, the heating block, and the through channel of the substrate are spaced apart.

6. The anti-torsion quick-change printhead structure according to claim 4, characterized in that: The connecting shaft forms an interference fit with the first slot and the second slot.

7. The anti-torsion quick-change printhead structure according to claim 3, characterized in that: The heating block includes a boss with a locking surface, and the inner wall of the first hole of the connecting plate is provided with a torque transmission surface that cooperates with the locking surface.

8. The anti-torsion quick-change printhead structure according to claim 1, characterized in that: It also includes a locking structure for pressing the throat against the heat sink body. The locking structure includes at least a set screw and a plug. The heat sink has a locking channel communicating with the through channel for installing the locking structure along the radial direction of the through channel. The throat extends into the through channel. The plug abuts against the outer periphery of the throat. Along the radial direction of the throat, the set screw can rotate on the internal threads of the heat sink and the plug to press the plug against the throat.

9. The anti-torsion quick-change printhead structure according to claim 8, characterized in that: The side surface of the block that contacts the larynx is configured to have a shape that adapts to the outer peripheral surface of the larynx.

10. A 3D printer, characterized in that, Includes the anti-torsion quick-change printhead structure as described in any one of claims 1-9.

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