Thermal insulation fastening mechanism and printhead

Abstract

The utility model discloses a kind of heat insulation fastening mechanism and print head, for the print head heating block is fixed on 3D printer backplate, including heating piece, multiple ladder connecting shafts, heat insulation component, tablet, fastening component;Backplate, heat insulation component, heating piece are sequentially arranged along ladder connecting shaft length direction;Ladder connecting shaft first end is connected with backplate, second end is connected with heating piece;The first side of heating piece towards backplate is provided with recess, and recess bottom is provided with heating sheet;Heat insulation component includes heat insulation block two, and the side of heat insulation block two first side surface coincides heating sheet and deviates recess bottom;Tablet is pressed in heat insulation block two second side surface, and heating sheet, heat insulation block two are abutted in recess;Fastening component is set to the second side of heating piece deviating backplate, and heating block is fixed on the second side of heating piece;To realize the reliable installation of heating block on backplate, guarantee the heating performance of heating block, effectively play heat insulation effect, reduce even avoid other mechanism heat influence.

Description

Technical Field

[0001] This utility model relates to the field of 3D printing technology, and in particular to a heat-insulating fastening mechanism and a print head. Background Technology

[0002] In 3D printing technology, such as fused deposition modeling (FDM), the filament output from the trolley is transported to the print head via a guide tube by the extruder. Temperature control at the print head is crucial to ensure smooth and efficient filament transport. If the filament softens prematurely in the print head inlet area, thermal creep will occur, causing blockage. Therefore, a heat sink is typically placed at the print head inlet to ensure the filament remains in a linear, solid state. When the filament reaches the heating element in the print head, it melts under the heating element, becoming a viscous flow, and is ultimately extruded from the print head nozzle.

[0003] In existing technology, the printhead is usually installed on the back plate in a quick-release structure. During use, the heat from the heating block in the printhead is easily transferred to the back plate and then to other structures. This not only affects the heat dissipation effect of the heat sink at the printhead inlet, but also affects the normal function of other structures due to the operating conditions being higher than the ambient temperature.

[0004] Therefore, there is an urgent need to develop a heat-insulating fastening mechanism to fix the heating block of the printhead to the back plate, so as to effectively insulate the heat while ensuring that the heating block is fully heated, thus avoiding affecting the normal operation of other structures of the printer. Utility Model Content

[0005] To address the aforementioned issues, this application provides a reasonably structured heat-insulating fastening mechanism and printhead, thereby enabling reliable installation of the heating block on the back plate, ensuring the heating performance of the heating block while providing effective heat insulation, and reducing or even preventing other mechanisms from being heated.

[0006] The technical solution adopted in this utility model is as follows: A heat-insulating fastening mechanism for fixing the heating block of the print head to the back plate of a 3D printer includes a heating element, multiple stepped connecting shafts, a heat insulation component, a pressure plate, and a fastening component. The back plate, the heat insulation component, and the heating element are arranged sequentially along the length of the stepped connecting shaft. The first end of the stepped connecting shaft is connected to the back plate, and the second end is connected to the heating element. The heating element has a groove on the first side facing the back plate, and a heating plate is provided at the bottom of the groove for heating the heating element; The heat insulation component includes a second heat insulation block, the first side of which abuts against the side of the heating element opposite to the bottom of the groove; The pressure plate abuts against the second side of the heat insulation block 2, and is used to fix the heating plate and the heat insulation block 2 in the groove; The fastening assembly is disposed on the second side of the heating element away from the back plate, and is used to fix the heating block to the second side of the heating element.

[0007] As a further improvement to the above technical solution: The heat insulation component further includes a heat insulation block, at least a portion of which is fitted onto the outer periphery of the stepped connecting shaft, and at least a portion of the outer periphery wall of the fitted section of the stepped connecting shaft is spaced apart from the heat insulation block.

[0008] The stepped connecting shaft includes, along its length, a connecting part one, an inwardly recessed part, a stop part, and a connecting part two connected in sequence. The connecting part two is inserted into the heating element to form a fast connection. The stop part extends outward in a direction perpendicular to the length of the stepped connecting shaft and extends beyond the connecting part two to stop the heating element. The connecting part one is connected to the back plate. The stop part and the connecting part one form an inwardly recessed part with a rapidly narrowed outer diameter to reduce heat conduction from the heating element to the back plate. Along the length of the stepped connecting shaft, the two ends of the heat insulation block one are respectively fitted onto the outer periphery of at least a portion of the connecting part one and the connecting part two.

[0009] The heat insulation block has a through structure for the stepped connecting shaft to pass through, and the inner wall of the through structure and the outer wall of at least one of the stepped connecting shafts form an inter-space that communicates with the outside.

[0010] The through structure includes a through cavity that extends through the heat insulation block along the length of the stepped connecting shaft. A protrusion extends from the inner wall of the through cavity toward the center of the through cavity. The protrusion and the through cavity form a recess. One or more stepped connecting shafts pass through the through structure through the recess.

[0011] The first side of the heat insulation block facing the heating element forms a concave structure that communicates with the through cavity, and the concave structure extends to the edge of the first side of the heat insulation block and communicates with the outside.

[0012] The heat insulation block is also provided with a through hole for passing through a single stepped connecting shaft, with the through hole fitting onto the outer periphery of a stepped connecting shaft.

[0013] The heating element extends outward from its first side to form a protruding tube for fitting the connecting part two. The protruding tube extends into the through structure and through hole one of the heat insulation block one, and at least part of its outer peripheral wall contacts the through structure and through hole one, for supporting the heat insulation block one.

[0014] The pressure plate includes a mounting part fixed to the heating element and a spring-loaded part that elastically presses against the second side of the heat insulation block. There is one or more pressure plates. The spring-loaded part is formed by extending from the mounting part, or the spring-loaded part is connected to the mounting part via a support.

[0015] The heating element extends outward from the second side away from the back plate to form mounting part one and mounting part two. The fastening assembly includes a limiting member and a locking member. Mounting part one is rotatably fitted with the limiting member, and mounting part two is rotatably fitted with the locking member. The limiting member rotates toward the locking member to surround and fix the heating block on the second side of the heating element. The locking member and the end of the limiting member are fastened together.

[0016] The limiting member is a spring piece adapted to the heating element, and the locking member is an elastic buckle. The upper and lower edges of the elastic buckle are recessed to form a bayonet, and the end of the spring piece extends with folded ears arranged at intervals. The folded ears are fitted into the corresponding bayonet, and the spring piece and the elastic buckle are fastened together. A space for fixing the heating block is formed between the second side of the heating element and the spring piece and the elastic buckle.

[0017] A printhead includes the heat insulation fastening mechanism described in any one of the above descriptions, wherein a linear consumable is fed into a heating block via a feed tube, heated and melted, and then conveyed outward through a nozzle.

[0018] Compared with the prior art, the present invention has the following beneficial effects: This utility model uses a stepped connecting shaft to connect a back plate and a heating element at both ends respectively, with the back plate and heating element spaced apart. A heat insulation component is provided between the back plate and the heating element, and the heating block is installed on the second side of the heating element away from the heat insulation component. This achieves an indirect and reliable installation of the heating block on the back plate, ensuring the heating performance of the heating block while providing effective heat insulation, reducing or even avoiding the heat-affected parts of other mechanisms. This utility model also has the following advantages: The heat insulation component includes a heat insulation block 1 located between the back plate and the heating element, and a heat insulation block 2 located on the side of the heating element and attached to the heating sheet. It effectively reduces or even blocks the heat transfer from the heating element and heating sheet to the back plate, ensuring the heat insulation effect. The pressing of the plate allows the heating sheet to fully heat the heating element, thereby allowing the heating element to fully conduct heat to the heating block of the print head. The design of the inward-recessed part of the stepped connecting shaft effectively reduces the heat conducted from the heating element to the back plate through the stepped connecting shaft. The heat insulation block runs through the inner wall of the structure and forms an inter-space that communicates with the outside, which helps to dissipate heat quickly and ensures the overall heat insulation effect of the heat insulation fastening mechanism. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is a structural schematic diagram of the present invention from another perspective.

[0021] Figure 3 This is an exploded view of the present invention.

[0022] Figure 4 This is a cross-sectional view of the present invention along the axial direction of the stepped connection axis.

[0023] Figure 5 This is a schematic diagram of the assembly of the heat insulation block and the stepped connecting shaft of this utility model.

[0024] Figure 6 This is a schematic diagram of the installation of the heat insulation block 2 on the side of the heating element of this utility model.

[0025] Figure 7 This is another installation diagram of the heat insulation block 2 on the side of the heating element of this utility model.

[0026] Figure 8 This is a schematic diagram of the fastening component of this utility model in the fastened state (heating block omitted).

[0027] The components include: 1. Insulation block one; 2. Stepped connecting shaft; 3. Heating plate; 4. Heating element; 5. Insulation block two; 6. Fastening assembly; 7. Heating block; 8. Pressure plate; 91. Bolt; 92. Screw; 10. Back plate; 11. Through cavity; 12. Concave structure; 13. Through hole one; 14. Through hole two; 111. Recess; 112. Protrusion; 21. Connecting part one; 22. Retractable part; 23. Stopping part; 24. Connecting part two; 41. Protruding tube; 42. Through groove; 43. Groove; 44. Mounting part one; 45. Mounting part two; 46. Notch; 50. Shaft pin; 51. First side surface; 52. Second side surface; 61. Limiting component; 62. Locking component; 611. Folding lug; 621. Bayonet; 70. Feed pipe; 81. Mounting section; 82. Spring-loaded section; 83. Support body. Detailed Implementation

[0028] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0029] It should be noted that in the description of this utility model, terms such as "upper," "lower," "left," "right," "front," "rear," "horizontal," and "vertical," 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 "a," "b," "first," and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set up," "connected," "linked," "fixed," etc., should be interpreted broadly. For example, they can refer to detachable connections, integrated molding connections, etc., and the two structures can be directly connected or indirectly connected through other structures. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] like Figures 1 to 7 As shown, a heat insulation fastening mechanism of this embodiment is used to fix the heating block 7 of the print head to the back plate 10 of the 3D printer, including a heating element 4, multiple stepped connecting shafts 2, a heat insulation component, a pressure plate 8, and a fastening component 6. The back panel 10, the heat insulation component, and the heating element 4 are arranged sequentially along the length of the stepped connecting shaft 2; The first end of the stepped connecting shaft 2 is connected to the back plate 10, and the second end is connected to the heating element 4; The heating element 4 has a groove 43 on the first side facing the back plate 10, and a heating plate 3 is provided at the bottom of the groove 43 for heating the heating element 4; The heat insulation component includes a second heat insulation block 5, the first side 51 of which abuts against the side of the heating element 3 opposite to the bottom of the groove 43; The pressure plate 8 abuts against the second side 52 of the heat insulation block 2 5, and is used to fix the heating plate 3 and the heat insulation block 2 5 in the groove 43; The fastening assembly 6 is disposed on the second side of the heating element 4 away from the back plate 10, and is used to fix the heating block 7 to the second side of the heating element 4.

[0032] A stepped connecting shaft 2 is used, with one end connected to the back plate 10 and the other end connected to the heating element 4. A heat insulation component is provided between the back plate 10 and the heating element 4. The heating block 7 is installed on the second side of the heating element 4 away from the heat insulation component via a fastening component 6. Preferably, the heating block 7 is in contact with the second side of the heating element 4 in a way that the heating block 7 is fitted against the second side of the heating element 4. This achieves reliable indirect installation of the heating block 7 on the back plate 10 and spacing between the two. Here, the fastening component 6 can be used to fix the heating block 7 to the second side of the heating element 4 with screws, or it can be used with a snap-fit ​​structure, etc. As long as the heating block 7 can be fixed to the second side of the heating element 4, no specific limitation is made here. The heating element 4 has a groove 43 on the first side facing the back plate 10, and the heating element 3 is housed at the bottom of the groove 43. At the same time, a heat insulation block 5 is set on the side of the heating element 3 away from the bottom of the groove 43 and is fixed in the groove 43 by a pressing plate 8. The heating element 3 and the heat insulation block 5 are used to heat the heating element 4 and then conduct the heat to the print head heating block 7 through the heating element 4. This effectively ensures the heating and heat transfer effect of the heating element 4 and the heating block 7. At the same time, the heat insulation block 5 blocks the heating element 3, effectively reducing the heat transfer from the heating element 3 away from the heating element 4 and ensuring the heat insulation of the heating element 4 after installation. Here, it is preferable that the heating element 3 is set to fit against the bottom of the groove 43 and the first side 51 of the heat insulation block 5 is set to fit against the side of the heating element 3 away from the bottom of the groove 43.

[0033] Here, the material of the stepped connecting shaft 2 is selected as a material with low thermal conductivity or heat insulation, such as titanium alloy; there are multiple stepped connecting shafts 2, such as 2, 3, 4, etc., and the number is not specifically limited as long as the fastening support is met; the heating element 3 can generate heat after being powered on. For example, the heating element 3 can be selected as a ceramic heating element.

[0034] The thermal insulation component also includes a thermal insulation block 1, at least a portion of which is fitted onto the outer periphery of the stepped connecting shaft 2, and at least a portion of the outer periphery of the stepped connecting shaft 2 in the fitted section is spaced apart from the thermal insulation block 1.

[0035] In this embodiment, the heat insulation component includes a heat insulation block 1 and a heat insulation block 5 located between the back plate 10 and the heating element 4. The heat insulation block 5 presses against the heating element 3, effectively reducing or even blocking the heat transfer from the heating element 4 and the heating element 3 to the back plate 10, thus ensuring the heat insulation effect.

[0036] The heat insulation block 1 is sleeved on the outer periphery of the stepped connecting shaft 2, and the stepped connecting shaft 2 forms a load-bearing support for the heat insulation block 1, ensuring the structural support reliability after installation. In addition, at least part of the outer periphery of the stepped connecting shaft 2 is spaced apart from the heat insulation block 1, so that the stepped connecting shaft 2 can reduce heat conduction and reliably dissipate heat at the interval while playing a connecting role, reducing the heat transfer caused by the stepped connecting shaft 2 and helping to ensure the heat insulation effect.

[0037] The stepped connecting shaft 2 includes, along its length, a connecting part 1 21, an inwardly recessed part 22, a stop part 23, and a connecting part 24 connected in sequence, as shown below. Figure 3 and Figure 4 As shown, the second connecting part 24 is inserted into the heating element 4 to form a fast connection. The stop part 23 extends outward in the direction perpendicular to the length of the stepped connecting shaft 2 and extends beyond the second connecting part 24 to stop the heating element 4. The first connecting part 21 is connected to the back plate 10. The stop part 23 and the first connecting part 21 form an inner recess 22 with a sudden narrowing of the outer diameter to reduce the heat conduction from the heating element 4 to the back plate 10. Along the length of the stepped connecting shaft 2, the two ends of the heat insulation block 1 are respectively fitted onto the outer periphery of at least part of the first connecting part 21 and the second connecting part 24.

[0038] In this embodiment, the connecting part 21 serves as the first end of the stepped connecting shaft 2 and is connected to the back plate 10. The connection between the connecting part 21 and the back plate 10 can adopt existing conventional connection structures, including but not limited to welding, screwing, gluing, interference fit, etc., as long as it can achieve the installation and fixation between the connecting part 21 and the back plate 10. In one embodiment, the connecting part 21 and the back plate 10 are connected by fasteners such as bolts 91 and screws 92. For example, the back plate 10 has a through stepped hole for the stepped connecting shaft 2 to be inserted. The connecting part 21 is inserted into the through stepped hole of the back plate 10 and its end abuts against the step of the through stepped hole. For example, an internal threaded hole is opened at the end of the connecting part 21, and the external bolts 91 and screws 92 pass through the back plate 10 from the side of the back plate 10 away from the heat insulation block 1 and lock towards the internal threaded hole, so as to achieve quick and reliable fixed installation between the connecting part 21 and the back plate 10 at the first end of the stepped connecting shaft 2.

[0039] In this embodiment, the second connecting part 24 serves as the second end of the stepped connecting shaft 2 and connects to the heating element 4. The connection between the second connecting part 24 and the heating element 4 can also employ conventional connection structures, including but not limited to welding, screwing, gluing, and interference fitting, as long as the connection between the second connecting part 24 and the heating element 4 is securely installed. In one embodiment, the second connecting part 24 may have an external thread, and the heating element 4 may have an internal thread hole adapted to the external thread, enabling quick and reliable fixed installation between the second connecting part 24 and the heating element 4 at the second end of the stepped connecting shaft 2.

[0040] In this embodiment, the baffle 23 serves as a stop, effectively limiting the installation depth of the second end of the stepped connecting shaft 2 into the heating element 4, ensuring installation consistency, and reducing heat transfer from the heating element 4 through the stepped connecting shaft 2 while fixing the installation.

[0041] In this embodiment, by setting the inward portion 22 between the upper stop 23 and the connecting portion 21 of the stepped connecting shaft 2, an interval space is formed between the outer wall of the inward portion 22 and the heat insulation block 1, which ensures the heat dissipation of the stepped connecting shaft 2, and reduces the heat transfer from the heating element 4 to the back plate 10 by the inward portion 22. For example, the inward portion 22 may be an annular groove formed between the stop 23 and the connecting portion 21.

[0042] The heat insulation block 1 has a through structure for the stepped connecting shaft 2 to pass through, and the inner wall of the through structure and the outer wall of at least one stepped connecting shaft 2 form an inter-space that communicates with the outside.

[0043] In this embodiment, the heat insulation block 1 penetrates the inner wall of the structure and forms an inter-space that communicates with the outside world between the outer wall of the stepped connecting shaft 2 and the inner wall of the structure. This helps to ensure reliable and rapid heat dissipation of the stepped connecting shaft 2, which is connected to the heating element 4 at the end, and ensures the overall heat insulation effect of the mechanism.

[0044] In one embodiment, such as Figure 5 As shown, the through structure includes a through cavity 11 that is opened through the heat insulation block 1 along the length direction of the stepped connecting shaft 2. A protrusion 112 extends from the inner wall of the through cavity 11 toward the center of the through cavity 11. The protrusion 112 and the through cavity 11 form a recess 111. One or more stepped connecting shafts 2 pass through the through structure through the recess 111.

[0045] In this embodiment, by setting the through cavity 11 and protrusion 112 at the through structure, a recess 111 is formed in the through cavity 11. The recess 111 ensures the stability of the stepped connecting shaft 2 relative to the heat insulation block 1 mounting structure. The through cavity 11 expands and ensures the spacing between the heat insulation block 1 and the stepped connecting shaft 2, ensuring effective heat insulation and heat dissipation of the heat insulation block 1 at the stepped connecting shaft 2. It can also be used as an external channel for the wires of heating elements 3, thermistors and other devices installed on the heating element 4.

[0046] The first side of the heat insulation block 1 facing the heating element 4 forms a concave structure 12 that communicates with the through cavity 11. The concave structure 12 extends to the edge of the first side of the heat insulation block 1 and communicates with the outside.

[0047] In this embodiment, by setting the concave structure 12 on the side of the heat insulation block 1, the through cavity 11 can smoothly communicate with the outside through the concave structure 12, ensuring the communication between the through structure and the outside, and ensuring the heat insulation effect of the heat insulation block 1.

[0048] The heat insulation block 1 is also provided with a through hole 13 for passing through a single stepped connecting shaft 2, and a through hole 13 is fitted onto the outer periphery of a stepped connecting shaft 2.

[0049] In this embodiment, a stepped connecting shaft 2 is arranged in a through hole 13. The fit between at least a portion of the stepped connecting shaft 2 and the through hole 13, combined with other stepped connecting shafts 2, ensures the reliability of the heat insulation block 1 mounted on the stepped connecting shaft 2, guarantees the relative position after assembly, and ensures the actual heat insulation effect of the heat insulation block 1 located between the heating element 4 and the back plate 10. It is understood that there can be multiple stepped connecting shafts 2, and one or more through holes 13. One through hole 13 is fitted onto the outer periphery of one stepped connecting shaft 2. When the heat insulation block 1 does not have a through structure, each stepped connecting shaft 2 passes through an equal number of through holes 13 to connect with the back plate 10 and the heating element 4.

[0050] The heating element 4 extends outward from the first side to form a protruding tube 41 for fitting the connecting part 24. The protruding tube 41 extends into the through structure and through hole 13 of the heat insulation block 1, and at least part of its outer peripheral wall contacts the through structure and through hole 13 to support the heat insulation block 1.

[0051] In this embodiment, the heating element 4 extends toward the through structure and through hole 13 to form a convex tube 41, which is connected to the second end of the stepped connecting shaft 2. The fitting of the convex tube 41 into the through structure and through hole 13 ensures the relative fixation of the installation structure between the heating element 4 and the heat insulation block 1. It can be understood that the through structure and through hole 13 of the heat insulation block 1 is sleeved on the outer periphery of the convex tube 41 at the end near the heating element 4, and the convex tube 41 is sleeved on the outer periphery of the connecting part 24.

[0052] The pressure plate 8 includes a mounting part 81 fixed to the heating element 4 and a spring-loaded part 82 that elastically presses against the second side surface 52 of the heat insulation block 2 5. The pressure plate 8 is provided with one or more; the spring-loaded part 82 is formed by extending from the mounting part 81, or the spring-loaded part 82 is connected to the mounting part 81 via the support body 83.

[0053] In this embodiment, the pressure plate 8 is fixedly installed with the heating element 4 by the mounting part 81 combined with the fastener, and is elastically pressed onto the second side 52 of the heat insulation block 2 5 by the spring pressing part 82, so that the heat insulation block 2 5 and the heating plate 3 are reliably pressed and fixed in the groove 43 of the heating element 4 by the pressure plate 8.

[0054] In this embodiment, the spring pressing part 82 is a spring sheet structure that is bent relative to the mounting part 81 toward the heat insulation block 2 5. When the mounting part 81 is attached and fixed to the first side of the heating element 4, the spring sheet structure deforms and presses against the surface of the second side 52 of the heat insulation block 2 5.

[0055] In this embodiment, recesses 46 for accommodating the fitting part 81 can be formed on the first side of the heating element 4 on both sides of the groove 43, so that the fitting part 81 will not bulge outward relative to the side of the heating element 4 after the pressure plate 8 is installed.

[0056] The concave structure 12 of the heat insulation block 1 provides space for the spring-loaded part 82 of the pressure plate 8 to abut against the heat insulation block 2 5.

[0057] In actual operation, a through hole 14 can be made in the heat insulation block 1, or an external tool can be used through the through hole 14 or the through cavity 11 in the heat insulation block 1 to adjust the fasteners that are locked to the heating element 4 through the mounting part 81. The fasteners can be standard parts such as screws with slotted, Phillips, or internal and external hexagonal heads, which are easy to operate with tools.

[0058] Understandably, the through cavity 11, the concave structure 12, and the second through hole 14 together provide space for the installation and adjustment of the tablet 8.

[0059] exist Figure 6 In the embodiment shown, two pressure plates 8 are provided. Each pressure plate 8 includes a mounting part 81. An external fastener passes through the mounting part 81 and locks it to the first side of the heating element 4. The spring-loaded part 82 extending from the mounting part 81 is press-fitted to the side of the heat insulation block 2 5.

[0060] exist Figure 6 In the embodiment shown, two pressure plates 8 are installed on the sides of the heating element 4 on opposite sides of the groove 43, and the spring-loaded portions 82 of the two pressure plates 8 extend toward the surface of the heat insulation block 2 5 in the groove 43 to form a press fitting.

[0061] exist Figure 7 In the embodiment shown, a pressure plate 8 is provided. The pressure plate 8 includes two or more mounting parts 81 that are locked back to the sides of the external heating element 4 on opposite sides of the groove 43. The mounting parts 81 are connected to the support body 83 to form an integral structure. The support body 83 is bent and extended toward the heat insulation block 2 5 to form a spring-loaded part 82. When the mounting parts 81 are attached to the surface of the heating element 4 and locked in place, the spring-loaded part 82 elastically presses against the surface of the heat insulation block 2 5.

[0062] exist Figure 6 and Figure 7 In the embodiment shown, a through groove 42 can also be opened on one side edge of the groove 43 to connect to the corresponding end face adjacent to the side of the heating element 4, which facilitates the removal and placement of the heat insulation block 5 located in the groove 43 from the through groove 42, and also helps the heating element 4 to dissipate heat on the side of the groove 43.

[0063] The heating element 4 extends outward from the second side away from the back plate 10 to form a mounting part 44 and a mounting part 45. The fastening assembly 6 includes a limiting member 61 and a locking member 62. The mounting part 44 is rotatably fitted with the limiting member 61, and the mounting part 45 is rotatably fitted with the locking member 62. The limiting member 61 rotates toward the locking member 62 to surround and fix the heating block 7 to the second side of the heating element 4. The locking member 62 is fastened to the end of the limiting member 61.

[0064] It is understandable that when the limiting member 61 and the locking member 62 rotate in opposite directions and engage and lock, the heating block 7 is surrounded and fixed between the limiting member 61, the locking member 62 and the second side of the heating member 4.

[0065] In this embodiment, the mounting part 44 and the mounting part 45 can be lugs and protrusions formed by the outward extension of the second side of the heating element 4. Fitting holes are provided on the lugs and protrusions to form a pivotal structure that is rotatably connected to the limiting member 61 and the locking member 62. This facilitates the limiting member 61 and the locking member 62 to rotate in opposite directions to lock or to rotate in opposite directions to unlock, which is convenient for the replacement and installation of the heating block 7 located on the second side of the heating element 4.

[0066] In one embodiment, such as Figures 1-3 As shown, mounting part 44 can be a lug structure with upper and lower opposite lugs, and a shaft pin 50 is installed between the lugs through fitting holes. The end of the limiting member 61 is fitted to the shaft pin 50 to form a pivot structure; mounting part 45 can be a protrusion structure, with fitting holes at the upper and lower ends of the protrusion. The end of the locking member 62 is inserted into the fitting hole to form a pivot structure. For example, the limiting member 61 is a spring piece adapted to the heating block 7, and the locking member 62 is an elastic buckle, such as... Figure 8 As shown, the upper and lower edges of the elastic buckle are recessed to form a latch 621, and the end of the spring piece extends with folded ears 611 spaced vertically; the folded ears 611 are fitted into the corresponding latch 621, and the spring piece and the elastic buckle are fastened together. A space for fixing the heating block 7 is formed between the second side of the heating element 4 and the spring piece and the elastic buckle. At this time, the spring piece is attached to at least a part of the heating block 7 on the side away from the heating element 4.

[0067] The printhead of this embodiment includes any of the above-mentioned heat insulation fastening mechanisms. The linear consumable is conveyed to the heating block 7 through the feed pipe 70, heated and melted, and then conveyed outward through the nozzle.

[0068] It is understood that the socketing or setting in this application can be a direct socket or an indirect socket with other structures in between.

[0069] This invention enables reliable installation of the heating block on the back plate, ensuring the heating performance of the heating block while providing effective heat insulation, reducing or even preventing the heating effects on other components.

[0070] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0071] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. A heat-insulating fastening mechanism for fixing the heating block (7) of the print head to the back plate (10) of a 3D printer, characterized in that: Includes heating element (4), multiple stepped connecting shafts (2), heat insulation component, pressure plate (8), fastening component (6); The back plate (10), the heat insulation component, and the heating element (4) are arranged sequentially along the length direction of the stepped connecting shaft (2); The first end of the stepped connecting shaft (2) is connected to the back plate (10), and the second end is connected to the heating element (4); The heating element (4) has a groove (43) on the first side facing the back plate (10), and a heating plate (3) is provided at the bottom of the groove (43) for heating the heating element (4). The heat insulation assembly includes a second heat insulation block (5), the first side (51) of the second heat insulation block (5) abuts against the side of the heating element (3) away from the bottom of the groove (43); The pressure plate (8) abuts against the second side (52) of the heat insulation block (5) to fix the heating plate (3) and the heat insulation block (5) in the groove (43); The fastening component (6) is disposed on the second side of the heating element (4) away from the back plate (10) and is used to fix the heating block (7) to the second side of the heating element (4).

2. The heat-insulating fastening mechanism as described in claim 1, characterized in that: The heat insulation component further includes a heat insulation block (1), at least a portion of which is sleeved on the outer periphery of the stepped connecting shaft (2), and at least a portion of the outer periphery of the stepped connecting shaft (2) of the sleeved section is spaced apart from the heat insulation block (1).

3. The heat-insulating fastening mechanism as described in claim 2, characterized in that: The stepped connecting shaft (2) includes a connecting part one (21), a recessed part (22), a stop (23), and a connecting part two (24) connected in sequence along the length direction. The connecting part two (24) is inserted into the heating element (4) to form a fast connection. The stop (23) extends outward and beyond the connecting part two (24) in a direction perpendicular to the length of the stepped connecting shaft (2) to stop the heating element (4). The connecting part one (21) is connected to the back plate (10). The stop (23) and the connecting part one (21) form a recessed part (22) with a sudden narrowing of the outer diameter to reduce the heat conduction from the heating element (4) to the back plate (10). Along the length direction of the stepped connecting shaft (2), the two ends of the heat insulation block one (1) are respectively sleeved on the outer periphery of at least part of the connecting part one (21) and the connecting part two (24).

4. The heat-insulating fastening mechanism as described in claim 2, characterized in that: The heat insulation block (1) has a through structure for the stepped connecting shaft (2) to pass through, and the inner wall of the through structure and the outer wall of at least one of the stepped connecting shafts (2) form an inter-space that communicates with the outside.

5. The heat-insulating fastening mechanism as described in claim 4, characterized in that: The through structure includes a through cavity (11) that is opened through the heat insulation block (1) along the length direction of the stepped connecting shaft (2). A protrusion (112) extends from the inner wall of the through cavity (11) toward the center of the through cavity (11). The protrusion (112) and the through cavity (11) form a recess (111). One or more stepped connecting shafts (2) pass through the through structure through the recess (111).

6. The heat-insulating fastening mechanism as described in claim 5, characterized in that: The first side of the heat insulation block (1) facing the heating element (4) forms a concave structure (12) that communicates with the through cavity (11). The concave structure (12) extends to the edge of the first side of the heat insulation block (1) and communicates with the outside.

7. A heat-insulating fastening mechanism as described in any one of claims 2-6, characterized in that: The heat insulation block (1) is also provided with a through hole (13) for passing through a single stepped connecting shaft (2), and a through hole (13) is fitted onto the outer periphery of a stepped connecting shaft (2).

8. The heat-insulating fastening mechanism as described in claim 7, characterized in that: The heating element (4) extends outward from the first side to form a protruding tube (41) for sleeve connection part two (24). The protruding tube (41) extends into the through structure and through hole one (13) of the heat insulation block one (1) and at least part of the outer peripheral wall contacts the through structure and through hole one (13) to support the heat insulation block one (1).

9. The heat-insulating fastening mechanism as described in claim 1, characterized in that: The pressure plate (8) includes a mounting part (81) fixed to the heating element (4) and a spring-loaded part (82) that elastically presses against the second side (52) of the heat insulation block (5). The pressure plate (8) is provided with one or more. The spring-loaded part (82) is formed by extending from the mounting part (81), or the spring-loaded part (82) and the mounting part (81) are connected by a support (83).

10. The heat-insulating fastening mechanism as described in claim 1, characterized in that: The heating element (4) extends outward from the second side away from the back plate (10) to form a mounting part one (44) and a mounting part two (45). The fastening assembly (6) includes a limiting member (61) and a locking member (62). The mounting part one (44) is rotatably fitted with the limiting member (61), and the mounting part two (45) is rotatably fitted with the locking member (62). The limiting member (61) rotates toward the locking member (62) to surround and fix the heating block (7) on the second side of the heating element (4). The locking member (62) and the end of the limiting member (61) are fastened together.

11. The heat-insulating fastening mechanism as described in claim 10, characterized in that: The limiting member (61) is a spring piece adapted to the heating member (4), and the locking member (62) is an elastic buckle. The upper and lower edges of the elastic buckle are recessed to form a bayonet (621). The end of the spring piece extends with folded ears (611) arranged at intervals. The folded ears (611) are fitted into the corresponding bayonet (621), and the spring piece and the elastic buckle are fastened together. A space for fixing the heating block (7) is formed between the second side of the heating member (4) and the spring piece and the elastic buckle.

12. A printhead, characterized in that: The heat-insulating fastening mechanism includes any one of claims 1-11, wherein the linear consumable is conveyed to the heating block (7) through the feed pipe (70), and after being heated and melted, it is conveyed outward through the nozzle.

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