A print head for a three-dimensional printer and a three-dimensional printer

Abstract

The utility model discloses a printing head and three -dimensional printer for three -dimensional printer relates to three -dimensional printer technical field, wherein, printing head includes hot end device and printing head main part, and hot end device includes heat dissipation spare, heat conducting spare, throat pipe and nozzle, and heat conducting spare is spaced apart with heat dissipation spare, and the portion of throat pipe is contacted with heat conducting spare, and another part of throat pipe is contacted with heat dissipation spare, and nozzle is connected with heat conducting spare, and nozzle is communicated with throat pipe, printing head main part includes base and heating seat, and base is detachably connected with hot end device, and heating seat is movably arranged in base, and heating seat is formed with heating groove, and under the condition that hot end device is connected in base, hot end device is located heating groove at least partially. The utility model provides technical scheme aims at guaranteeing the effect of heating seat and heat conducting spare's pasting, to improve heating efficiency.

Description

Technical Field

[0001] This utility model relates to the field of 3D printer technology, and in particular to a printhead for a 3D printer and a 3D printer. Background Technology

[0002] A 3D printer can be equipped with multiple hot-end devices and a movable printhead body. The printhead body can pick up and place any of the hot-end devices. During printing, the printhead body can first pick up the first hot-end device to print the first material, then put the first hot-end device back, and then pick up the second hot-end device to print the second material. By continuously selecting the required hot-end device, multi-material or multi-color printing can be achieved. The printhead body can be equipped with a heating seat, and the hot-end devices are equipped with heat-conducting components that can transfer material. When the hot-end device and the printhead body are connected, the heating seat can heat the material within the heat-conducting components.

[0003] However, when the hot end device and the printhead body are connected together, the heating efficiency of the heating seat for the heat-conducting components is not high. Utility Model Content

[0004] The main purpose of this invention is to provide a printhead and a 3D printer for a 3D printer, which aims to ensure the fit between the heating seat and the heat-conducting component in order to improve heating efficiency.

[0005] To achieve the above objectives, this utility model proposes a printhead for a 3D printer. The printhead includes: a hot-end device comprising a heat sink, a heat conductor, a throat, and a nozzle, wherein the heat conductor and the heat sink are spaced apart; a portion of the throat contacts the heat conductor, and another portion of the throat contacts the heat sink; the nozzle is connected to the heat conductor and communicates with the throat; and a printhead body comprising a base and a heating seat, wherein the base is detachably connected to the hot-end device, the heating seat is movably disposed on the base, and the heating seat forms a heating groove; wherein, when the hot-end device is connected to the base, the hot-end device is at least partially located in the heating groove.

[0006] On the other hand, this utility model also proposes a 3D printer, comprising: multiple hot-end devices, each of the hot-end devices including a heat sink, a heat conductor, a throat, and a nozzle, wherein the heat conductor is spaced apart from the heat sink, a portion of the throat contacts the heat conductor, another portion of the throat contacts the heat sink, the nozzle is connected to the heat conductor, and the nozzle communicates with the throat; a printhead body, the printhead body including a base and a heating seat, the base being detachably connected to the hot-end devices, the heating seat being movably disposed on the base, the heating seat forming a heating groove, wherein when the hot-end devices are connected to the base, the hot-end devices are at least partially located in the heating groove; and a forming platform, the forming platform being movable relative to the printhead body.

[0007] In the technical solution of this utility model, the printhead body is provided with a base and a heating seat, and the heating seat is movably mounted on the base. When the base and the hot end device are connected together, the heating seat can move relative to the hot end device so that the heat-conducting component of the hot end device is in contact with the heating groove. This allows more heat from the heating seat to be transferred to the heat-conducting component, avoids heat loss, and improves heating efficiency. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0009] Figure 1 A schematic diagram of a structural embodiment of the 3D printer provided by this utility model; Figure 2 This is a structural diagram of the printhead body; Figure 3 A structural schematic diagram of the printhead body from another perspective; Figure 4 A structural diagram of part of the main body of the printhead; Figure 5 This is a schematic diagram of the drive mechanism and the extrusion mechanism; Figure 6 This is a schematic diagram of the heating base. Figure 7 This is an exploded view of the heating element; Figure 8 This is a structural schematic diagram of the base and clamping components; Figure 9 A structural schematic diagram of the base and clamping components from another perspective; Figure 10 Exploded view of the base and clamping components; Figure 11 This is a structural schematic diagram of the hot-end device and the mounting base; Figure 12 This is a structural schematic diagram of the hot-end device and the mounting base from another perspective. Figure 13 This is a schematic diagram of the hot-end device. Figure 14 This is a schematic diagram of the hot-end device from another perspective. Figure 15 This is a cross-sectional view of the hot-end device; Figure 16 This is a schematic diagram of another embodiment of the printhead provided by this utility model. Detailed Implementation

[0010] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0011] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0012] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0013] 3D printers are typically equipped with multiple hot-end devices and a movable printhead body. The printhead body can pick up and place any of the hot-end devices. During printing, the printhead body can first pick up the first hot-end device to print the first material, then put the first hot-end device back, and then pick up the second hot-end device to print the second material. By continuously selecting the required hot-end device, multi-material or multi-color printing can be achieved.

[0014] In a 3D printer, a heating seat is provided on the print head body, and a heat-conducting component capable of transferring material is provided on the hot end device. When the hot end device and the print head body are connected together, the heating seat can heat the material inside the heat-conducting component.

[0015] However, with this configuration, when the printhead body and the hot end device are connected, the heating element and the heat-conducting component must be in complete contact to ensure that the heat generated by the heating element is fully absorbed by the heat-conducting component. If there is a gap between the heating element and the heat-conducting component, the heating efficiency of the heating element will be reduced, which may prevent the filament from melting completely, thus affecting the printing effect.

[0016] This invention proposes a printhead 100 for a 3D printer 200 and a 3D printer 200, aiming to ensure the fit between the heating seat 27 and the heat-conducting component 13, so as to improve heating efficiency.

[0017] Please see Figures 1 to 16 In one embodiment of the present invention, the printhead 100 includes a hot end device 1 and a printhead body 2. The hot end device 1 includes a heat sink 12, a heat conductor 13, a throat 14, and a nozzle 15. The heat conductor 13 and the heat sink 12 are spaced apart. A portion of the throat 14 is in contact with the heat conductor 13, and another portion of the throat 14 is in contact with the heat sink 12. The nozzle 15 is connected to the heat conductor 13 and communicates with the throat 14. The printhead body 2 includes a base 21 and a heating seat 27. The base 21 is detachably connected to the hot end device 1. The heating seat 27 is movably disposed on the base 21 and forms a heating groove 271. When the hot end device 1 is connected to the base 21, the hot end device 1 is at least partially located in the heating groove 271.

[0018] In this embodiment, the heat-conducting element 13 is used to melt the consumables, and the nozzle 15 sprays out the molten consumables generated at the heat-conducting element 13. The heat dissipation element 12 is used to prevent the consumables upstream of the heat-conducting element 13 from melting prematurely. The heating seat 27 is movably mounted on the base 21, so that when the base 21 and the hot end device 1 are connected together, the heating seat 27 can move relative to the hot end device 1, so that the heat-conducting element 13 of the hot end device 1 is in contact with the heating groove 271, thereby allowing all the heat of the heating seat 27 to be transferred to the heat-conducting element 13, avoiding heat loss and improving heating efficiency.

[0019] Specifically, the surface of the heat sink 12 is provided with heat dissipation fins to increase the heat dissipation area and improve heat dissipation efficiency, and the consumables move along the channels formed inside the heat sink 12. The heat dissipation fins are located on opposite sides of the heat sink 12. When the printhead body 2 is connected to the hot end device 1, the heat dissipation fins are located on the side of the heat sink 12 facing the printhead body 2 and the side facing away from the printhead body 2.

[0020] Optionally, when the throat 14 is connected to the heat-conducting component 13 and the heat-dissipating component 12, a threaded connection can be used to increase the stability of the connection. Optionally, the detachable connection between the printhead body 2 and the hot end device 1 can be a magnetic connection, a threaded connection, or a snap-fit ​​connection.

[0021] In one implementation, please refer to Figure 3 , Figure 6 and Figure 7 The printhead body 2 also includes a fixing rod 276. One end of the fixing rod 276 is located on the base 21 and extends away from the base 21. The fixing rod 276 and the heating seat 27 are located on the same side of the base 21. The heating seat 27 is slidably located on the fixing rod 276.

[0022] In this embodiment, the fixing rod 276 and the heating seat 27 are located on the same side of the base 21, and the heating seat 27 is slidably mounted on the fixing rod 276, so that the heating seat 27 can be slidably adjusted along the fixing rod 276, and the position of the heating seat 27 can be flexibly changed according to the actual printing requirements, so as to achieve more precise positioning of the hot end device 1.

[0023] Alternatively, the fixing rod 276 can be fixed to the base 21 by threaded connection, welding or insertion.

[0024] In one implementation, please refer to Figure 3 and Figure 6 The printhead body 2 also includes a first elastic element 277, which is sleeved on the fixing rod 276. The two ends of the first elastic element 277 abut against the base 21 and the heating seat 27, respectively. When the base 21 and the heating end device 1 are connected, the length of the first elastic element 277 is less than the length of the first elastic element 277 when the base 21 and the heating end device 1 are disassembled.

[0025] In this embodiment, the printhead body 2 further includes a first elastic element 277, which is sleeved on the fixing rod 276, and its two ends abut against the base 21 and the heating seat 27, respectively. When the base 21 is connected to the hot end device 1, the length of the first elastic element 277 is less than its length when the base 21 and the hot end device 1 are disconnected. It is understood that in the connected state, the heating seat 27 will be subjected to a reaction force from the hot end device 1, thereby moving along the fixing rod 276 towards the base 21, compressing the first elastic element 277 and shortening its length.

[0026] It is understood that in this embodiment, the preload of the heating seat 27 is provided by the elastic deformation of the first elastic member 277, so as to ensure that the heating seat 27 is in close contact with the hot end device 1, thereby improving the heat transfer efficiency.

[0027] Optionally, the first elastic element 277 can be a compression spring made of materials such as spring steel, stainless steel, or heat-resistant alloy.

[0028] Optionally, elastic gaskets may be provided between the first elastic member 277 and the base 21, and between the first elastic member 277 and the heating seat 27, to distribute pressure and reduce local wear.

[0029] In one implementation, please refer to Figure 6 and Figure 7 The printhead body 2 also includes a limiting member 278, which is located at the other end of the fixing rod 276. In a first direction that is not parallel to the extension direction of the fixing rod 276, the size of the limiting member 278 is larger than the size of the fixing rod 276.

[0030] In this embodiment, both the limiting member 278 and the fixing rod 276 are cylindrical, and the radius of the limiting member 278 is larger than the radius of the fixing rod 276, so that the heating seat 27 is restricted between the limiting member 278 and the first elastic member 277 along the extension direction of the fixing rod 276, preventing the heating seat 27 from falling off the end of the fixing rod 276.

[0031] Specifically, the limiting member 278 and the fixing rod 276 are integrally formed and have a screw structure, which can enhance the structural strength of the connection between the heating seat 27 and the base 21.

[0032] Alternatively, the limiting member 278 can also be fixed to the end of the fixing rod 276 by means of threaded connection, snap-fit, welding or riveting.

[0033] In one implementation, please refer to Figure 7The heating base 27 includes a base 272, a mounting shell 273, and a heating element 274. The base 272 is slidably disposed on the fixing rod 276 and has a receiving groove 2721. The mounting shell 273 is disposed in the receiving groove 2721. At least a portion of the heating groove 271 is formed on the side of the mounting shell 273 facing the hot end device 1. The side of the mounting shell 273 away from the hot end device 1, together with the base 272, defines the mounting groove 2731. The heating element 274 is disposed in the mounting groove 2731.

[0034] In this embodiment, the base 272 is slidably mounted on the fixed rod 276. At the same time, a receiving groove 2721 is formed on the base 272 to receive the mounting shell 273. The mounting shell 273 is located in the receiving groove 2721. The side of the mounting shell 273 facing the hot end device 1 cooperates with the base 272 to form a heating groove 271 for installing and positioning the heat-conducting component 13.

[0035] Understandably, the base 272 serves as a support structure for mounting the heating element 274 and the mounting shell 273. Furthermore, the base 272 and the mounting shell 273 are independently molded for easy disassembly to replace the heating element 274.

[0036] Optionally, a high-temperature protective coating can be applied to the surface of the mounting housing 273 to extend its service life.

[0037] Alternatively, the heating element 274 may be an electric heating film, a ceramic heating element 274, or a metal heating wire, etc.

[0038] In one implementation, please refer to Figure 7 The heating base 27 also includes a spring 275, which is located in the mounting groove 2731. The spring 275 is connected to one side of the heating element 274, and the other side of the heating element 274 abuts against the mounting shell 273.

[0039] Understandably, the spring sheet 275 can provide elastic support for the heating element 274, ensuring that the heating element 274 fits tightly against the mounting shell 273, thereby improving heat conduction efficiency.

[0040] Optionally, the spring piece 275 can be fixed in the mounting groove 2731 by welding, riveting or screw connection, so that the spring piece 275 can only move in the direction of extension of the fixing rod 276 to ensure the stability of the contact.

[0041] Optionally, the spring 275 can be made of a material with good elasticity and heat resistance, such as stainless steel, copper alloy or high-temperature alloy.

[0042] In one implementation, please refer to Figure 7The base 272 includes a main body 2722 and a support body 2723. The main body 2722 has a receiving groove 2721 and a support groove 2725 on the side of the main body 2722 facing the base 21. The main body 2722 has a through hole 2724 connecting the receiving groove 2721 and the support groove 2725. The support body 2723 is disposed in the support groove 2725. The mounting shell 273 has a limiting protrusion 2732 on the side facing the support body 2723, and the through hole 2724 provides at least a partial path for the limiting protrusion 2732 to connect with the main body 2722.

[0043] In this embodiment, the main body 2722 has a receiving groove 2721 and a support groove 2725 on opposite sides, and the main body 2722 has a through hole 2724 connecting the receiving groove 2721 and the support groove 2725. The support body 2723 is disposed in the support groove 2725, while the mounting shell 273 is disposed in the receiving groove 2721. At the same time, the mounting shell 273 has a limiting protrusion 2732 on the side facing the support groove 2725, and the limiting protrusion 2732 is connected to the support body 2723 through the through hole 2724.

[0044] Specifically, the support body 2723 is provided with a hole that mates with the limiting protrusion 2732. The limiting protrusion 2732 passes through the through hole 2724 and is inserted into the corresponding hole, thereby ensuring the structural strength during connection.

[0045] In one implementation, please refer to Figure 7 When the base 21 is connected to the hot end device 1, the mounting shell 273 and the heat-conducting element 13 are in contact through a curved surface or multiple planes.

[0046] It is understandable that by increasing the contact area between the mounting housing 273 and the heat-conducting component 13, heat transfer efficiency and connection stability can be improved.

[0047] Specifically, the mounting housing 273 and the heat-conducting component 13 can contact each other through three planes, two of which are symmetrically arranged on both sides of the third plane, so that pressure and heat can be evenly distributed.

[0048] Alternatively, contact can be achieved using curved surfaces, such as cylindrical, spherical, or parabolic surfaces.

[0049] In one implementation, please refer to Figure 4 and Figure 13 The heat-conducting component 13 has a temperature measuring hole 132, and the heating base 27 includes a temperature measuring protrusion 2733 for mounting a temperature measuring element 279. When the base 21 is connected to the hot end device 1, the temperature measuring protrusion 2733 is at least partially located in the temperature measuring hole 132.

[0050] In this embodiment, when the printhead body 2 is connected to the hot end device 1, the temperature measuring hole 132 on the heat-conducting component 13 is aligned with the temperature measuring protrusion 2733 on the heating seat 27, and part of the temperature measuring protrusion 2733 is inserted into the temperature measuring hole 132 to ensure that the temperature measuring element 279 can accurately detect the temperature of the heat-conducting component 13 and ensure that the temperature control during printing is correct.

[0051] Optionally, the shape and size of the temperature measuring protrusion 2733 match the temperature measuring hole 132, and can be designed as cylindrical, square or other suitable shapes, without specific limitations.

[0052] Optionally, the temperature sensing element 279 can be a thermocouple, a thermistor, or an infrared sensor, etc.

[0053] In one implementation, please refer to Figure 4 and Figure 5 The printhead body 2 is detachably connected to the hot end device 1. The printhead body 2 includes a drive mechanism 22 and an extrusion mechanism 23. The extrusion mechanism 23 includes a first extrusion wheel 231 and a second extrusion wheel 232. The first extrusion wheel 231 is driven to be connected to the drive mechanism 22. The first extrusion wheel 231 and the second extrusion wheel 232 are spaced apart.

[0054] In one implementation, please refer to Figure 4 and Figure 5 The drive mechanism 22 includes a drive motor 221, a drive wheel 222, a transmission component 223, a first auxiliary wheel 224, and a second auxiliary wheel 225. The drive wheel 222 is located on the output shaft of the drive motor 221. The transmission component 223 connects the drive wheel 222 and the first auxiliary wheel 224. The first auxiliary wheel 224 and the first extrusion wheel 231 are coaxially arranged. The second auxiliary wheel 225 and the second extrusion wheel 232 are coaxially arranged. The first auxiliary wheel 224 and the second auxiliary wheel 225 are arranged side by side in the vertical direction, and the radius of the first auxiliary wheel 224 is larger than the radius of the first extrusion wheel 231, and the radius of the second auxiliary wheel 225 is larger than the radius of the second extrusion wheel 232.

[0055] In one implementation, please refer to Figure 5 The transmission component 223 includes a first transmission wheel 2231, a second transmission wheel 2232, and a transmission rod 2233. The first transmission wheel 2231 meshes with the drive wheel 222, and the second transmission wheel 2232 meshes with the first auxiliary wheel 224. The first transmission wheel 2231 and the second transmission wheel 2232 are sleeved on the transmission rod 2233.

[0056] In one implementation, please refer to Figure 13 and Figure 14The hot end device 1 also includes a hot end body 10 and a material guide connector 16. The hot end body 10 is used to install the heat sink 12. The material guide connector 16 is installed on the hot end body 10 and is located at the end of the heat sink 12 away from the heat conductor 13. The material guide connector 16 and the heat sink 12 are spaced apart. When the print head body 2 is connected to the hot end device 1, the first extrusion wheel 231 and the second extrusion wheel 232 are located between the material guide connector 16 and the heat sink 12.

[0057] In one implementation, please refer to Figure 13 and Figure 15 The hot end device 1 also includes a heat insulation element 17, and a heat insulation space 131 is formed between the heat conduction element 13 and the hot end body 10. The heat insulation element 17 is disposed in the heat insulation space 131.

[0058] In one implementation, please refer to Figure 13 and Figure 15 The hot end device 1 also includes a fastener 18, one end of which is limited to the hot end body 10, and the other end of which is fixedly connected to the heat sink 12.

[0059] In one implementation, please refer to Figure 3 and Figure 13 The hot end device 1 also includes a first cutting seat 191 and a second cutting seat 192 disposed on the hot end body 10. The first cutting seat 191 and the second cutting seat 192 are located between the material guide joint 16 and the heat sink 12, and a cutting gap 193 is formed between the first cutting seat 191 and the second cutting seat 192. The print head body 2 also includes a cutter 211. When the print head body 2 is connected to the hot end device 1, the cutter 211 has a first cutting state located within the cutting gap 193 and a second cutting state located outside the cutting gap 193.

[0060] In one implementation, please refer to Figure 4 , Figure 13 and Figure 15 The hot end device 1 also includes a mounting base 11 and a material breakage detection element 112. The mounting base 11 is mounted on the hot end body 10 and defines a material guide channel 111. The material breakage detection element 112 is mounted on the mounting base 11 and has a first position state located inside the material guide channel 111 and a second position state located outside the material guide channel 111.

[0061] In this embodiment, the mounting base 11 is fixed on the hot end body 10 and, when the printhead body 2 is connected to the hot end device 1, is located between the feed connector 16 and the extrusion mechanism 23. It transmits the consumable material at the feed connector 16 to the extrusion mechanism 23 through the feed channel 111. Simultaneously, the surface of the mounting base 11 has an movable opening communicating with the feed channel 111. The material breakage detection element 112 is rotatably mounted on the heat-conducting body. One side of the material breakage detection element 112 is rotatably mounted on the mounting base 11, while the other side extends into the feed channel 111 in its natural state and is in a first position. The printhead body 2 also includes a material breakage sensor 26. In the first position, the material breakage detection element 112 is relatively far from the material breakage sensor 26; in the second position, the material breakage detection element 112 is relatively close to the material breakage sensor 26. The material breakage sensor 26 determines whether the consumable material delivery is interrupted by detecting the positional change of the material breakage detection element 112.

[0062] Understandably, when consumables are being fed normally, the flowing consumables exert pressure on the material breakage detection element 112, causing it to rotate and leave the material guide channel 111. The material breakage sensor 26 then detects that the material breakage detection element 112 is in the second position. When the consumables feeding is interrupted, the material breakage detection element 112 returns to its natural state and re-enters the material guide channel 111. The material breakage sensor 26 then detects that the material breakage detection element 112 is in the first position.

[0063] Optionally, a fourth elastic element 113 may be provided on the side where the material breakage detection element 112 is connected to the mounting base 11 to ensure reset capability.

[0064] Optionally, the material breakage sensor 26 may be a photoelectric sensor, a proximity sensor or a magnetic induction sensor, etc., without specific limitations.

[0065] In one implementation, please refer to Figure 2 , Figure 3 and Figure 4 The printhead body 2 also includes a heating seat 27, which defines a heating groove 271. When the printhead body 2 is in contact with the hot end device 1, the heat-conducting element 13 is located in the heating groove 271, and the heat-conducting element 13 is spaced apart from or in contact with the heating seat 27.

[0066] It should be noted that at this time, the heat-conducting component 13 and the heating base 27 can be in contact with each other to transfer heat, thereby heating the heat-conducting component 13 through the heating base 27. Alternatively, please refer to... Figure 16Alternatively, the induction coil 2741 can be installed via the heating base 27. The heat-conducting component 13 has a heating element 133 protruding from its surface. When the printhead body 2 is connected to the hot end device 1, the heating element 133 is inserted into the induction coil 2741, with a gap between the heating element 133 and the induction coil 2741. Heating is achieved through electromagnetic induction, eliminating the need for the heat-conducting component 13 to be in complete contact with the heating base 27, thus reducing alignment accuracy. Simultaneously, an infrared temperature sensor 2791 is also provided on the base 21, which can directly detect the temperature of the inserted heating element 133.

[0067] In one implementation, please refer to Figure 1 When the printhead body 2 is in contact with the hot end device 1, the hot end device 1 can move relative to the printhead body 2.

[0068] In one implementation, please refer to Figure 2 and Figure 13 The hot end device 1 is provided with at least one first magnetic element 101 on the side facing the printhead body 2, and / or the printhead body 2 is provided with at least one second magnetic element 212 on the side facing the hot end device 1.

[0069] In one implementation, please refer to Figure 2 and Figure 3 The printhead body 2 also includes a clamping member 24 and a third elastic member 247. The clamping member 24 is rotatably disposed on the base 21, and the third elastic member 247 is connected to the clamping member 24 and the base 21 respectively. When the base 21 is connected to the hot end device 1, the clamping member 24 clamps the hot end device 1.

[0070] In one implementation, please refer to Figure 8 , Figure 9 and Figure 10 The base 21 is provided with a first mounting hole 213, and the clamping member 24 is provided with a second mounting hole 241 corresponding to the first mounting hole 213; and the print head body 2 also includes a rotating rod 242, at least part of which is located in the first mounting hole 213, and at least another part of which is located in the second mounting hole 241.

[0071] In one implementation, please refer to Figure 9 and Figure 10 The third elastic element 247 includes a torsion spring, which is at least partially sleeved on the rotating rod 242, and the two ends of the torsion spring are respectively connected to the clamping member 24 and the base 21.

[0072] In one implementation, please refer to Figure 13 and Figure 14The hot end body 10 has at least one through hole 104. When the base 21 is connected to the hot end device 1, the clamping member 24 is at least partially located in the through hole 104.

[0073] In one implementation, please refer to Figure 10 and Figure 13 At least one through hole 104 includes a first through hole 104 and a second through hole 104; and the clamping member 24 includes a base portion 246, a first insertion portion 243 and a second insertion portion 244, one side of the base portion 246 is rotatably connected to the base 21; the first insertion portion 243 is connected to one end of the other side of the base portion 246; the second insertion portion 244 is connected to the other end of the other side of the base portion 246, and a clearance space 245 is formed between the first insertion portion 243 and the second insertion portion 244.

[0074] In one implementation, please refer to Figure 10 At least one of the first insertion portion 243 and the second insertion portion 244 includes a connecting segment 2431 and a limiting segment 2432. One side of the connecting segment 2431 is connected to the base portion 246. The limiting segment 2432 has a first side and a second side disposed opposite to each other. The first side is close to the connecting segment 2431 and has an abutting surface 2433 protruding from the surface of the connecting segment 2431. An inclined guide surface 2434 is formed between the first side and the second side, and the guide surface 2434 is connected to the abutting surface 2433.

[0075] In one implementation, please refer to Figure 4 and Figure 13 The heat sink 12 has at least one guide groove 121; and the print head body 2 also includes at least one guide post 25, each guide post 25 is mounted on the base 21, each guide post 25 is spaced apart from the clamping member 24, and at least one guide groove 121 corresponds to at least one guide post 25. When the base 21 is connected to the hot end device 1, each guide post 25 is at least partially located in the corresponding guide groove 121.

[0076] In one implementation, please refer to Figure 4 and Figure 13 At least one guide post 25 includes a first guide post 252 and a second guide post 253, at least one guide groove 121 includes a first guide groove 1212 and a second guide groove 1213, and the printhead body 2 includes a fourth magnetic element 251 disposed between the first guide post 252 and the second guide post 253, and the hot end device 1 includes a fifth magnetic element 1211 disposed between the first guide groove 1212 and the second guide groove 1213.

[0077] In one implementation, please refer to Figure 3 , Figure 4 and Figure 5The printhead body 2 also includes an adjustment frame 28. The first end of the adjustment frame 28 is rotatably mounted on the base 21. The adjustment frame 28 is rotatably connected to the second extrusion wheel 232. The second end of the adjustment frame 28 is provided with a limiting roller 2851.

[0078] In one implementation, please refer to Figure 4 The adjusting frame 28 defines an installation space 281, which is located between the first end and the second end of the adjusting frame 28, and the second extrusion wheel 232 is at least partially located within the installation space 281.

[0079] In one implementation, please refer to Figure 4 and Figure 5 The adjustment frame 28 includes a rotating part 282, a main body 283, a connecting part 284, and a mounting part 285. The rotating part 282 is rotatably mounted on the base 21. One end of the main body 283 is connected to the rotating part 282, and the main body 283 defines the mounting space 281. The connecting part 284 is connected to the other end of the main body 283. The mounting part 285 is connected to the end of the connecting part 284 away from the main body 283. The mounting part 285 is provided with a limiting roller 2851, and the mounting part 285 and the connecting part 284 are arranged at an angle.

[0080] In one implementation, please refer to Figure 4 The mounting part 285 has a rotating hole 2852, and the limiting roller 2851 is rotatably disposed in the rotating hole 2852. The limiting roller 2851 protrudes from the surface of the mounting part 285, and / or the included angle between the mounting part 285 and the connecting part 284 is an obtuse angle.

[0081] In one implementation, please refer to Figure 4 The adjusting frame 28 also includes a roller shaft 2853, which is installed in the rotating hole 2852. One end of the roller shaft 2853 is connected to the inner wall of the rotating hole 2852 away from the connecting part 284, and the other end of the roller shaft 2853 is connected to the inner wall of the rotating hole 2852 close to the connecting part 284. The limiting roller 2851 is rotatably mounted on the roller shaft 2853.

[0082] In one implementation, please refer to Figure 3 and Figure 4 The printhead body 2 also includes a rotating seat 29, which is located on the base 21. The rotating seat 29 encloses and forms a rotating space 291. The rotating seat 29 also has a first opening 292 and a second opening 293, which are respectively connected to the rotating space 291. A portion of the adjusting frame 28 protrudes from the first opening 292, and the other portion of the adjusting frame 28 is located in the rotating space 291. The limiting roller 2851 is located outside the rotating space 291. A portion of the second extrusion wheel 232 protrudes from the second opening 293, and the other portion of the second extrusion wheel 232 is located in the rotating space 291.

[0083] In one implementation, please refer to Figure 4 The printhead body 2 also includes a second elastic element 2911, which is disposed in the rotation space 291. The two ends of the second elastic element 2911 abut against the rotating seat 29 and the adjusting frame 28, respectively.

[0084] Please see Figure 1 This utility model also proposes a three-dimensional printer 200, which includes multiple hot end devices 1, a print head body 2 and a forming platform. The hot end devices 1 can be any of the above-mentioned hot end devices 1, and the print head body 2 can be any of the above-mentioned print head bodies 2; the forming platform and the print head body 2 can move relative to each other.

[0085] The specific structure of the printhead body 2 and each hot end device 1 is as described in the above embodiments. Since the 3D printer 200 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0086] The printhead body 2 can drive the hot end device 1 to move relative to the molding platform, thereby depositing material layer by layer on the molding platform according to a predetermined path to build a three-dimensional object.

[0087] In one implementation, please refer to Figure 1 and Figure 11 The 3D printer 200 also includes a mounting base 3, which includes a mounting body 31 and a plurality of limiting rods 32 disposed on the mounting body 31. Any hot end device 1 is detachably connected to the main body of the mounting base 3.

[0088] In this embodiment, each hot-end device 1 can be detachably connected to the fixed body 31. The fixed body 31 is also provided with multiple limiting rods 32, and when the hot-end device 1 is connected to the fixed body 31, each limiting rod 32 corresponds to one hot-end device 1. At this time, the limiting roller 2851 contacts the limiting rod 32, thereby driving the adjusting frame 28 to rotate and adjust the size of the extrusion channel 233.

[0089] It is understood that the printhead body 2 is detachably connected to any hot-end device 1, and the limiting roller 2851 and the limiting rod 32 of the printhead body 2 can selectively contact and separate. Specifically, when the printhead body 2 removes the hot-end device 1 from the fixed base 3, the limiting roller 2851 contacts the limiting rod 32 corresponding to this hot-end device 1 to adjust the size of the extrusion channel 233. When the printhead body 2 drives the hot-end device 1 away from the fixed base 3, the limiting roller 2851 separates from the limiting rod 32 corresponding to this hot-end device 1, and the extrusion channel 233 returns to its initial size.

[0090] In one implementation, please refer to Figure 14 and Figure 15 The hot end device 1 also includes a third magnetic element 103, which is located on the side of the hot end body 10 facing away from the heat sink 12.

[0091] It is understood that in this embodiment, the connection between the printhead body 2 and the hot end device 1 can be achieved through magnetic attraction, which also facilitates the printhead body 2 to move the hot end device 1 away from the fixed base 3.

[0092] In one implementation, please refer to Figure 11 and Figure 12 The mounting base 3 is also provided with multiple pick-up and drop-off holes 33. When the hot end device 1 is connected to the mounting base 3 and the printhead body 2 respectively, the projection of the through hole 104 on the surface of the mounting body 31 is located in the pick-up and drop-off holes 33. When the printhead body 2 removes the hot end device 1 from the mounting base 3, the clamping member 24 passes through the through hole 104 and the pick-up and drop-off holes 33 in sequence to support the hot end device 1 from the bottom. The clamping member 24 can move horizontally within the pick-up and drop-off holes 33 and is limited and abutted against the side wall of the through hole 104 in the horizontal direction.

[0093] Specifically, the upper sidewall of the pick-up and put-out hole 33 is provided with a protrusion so that the upper sidewall of the pick-up and put-out hole 33 has a mounting surface 331, a limiting surface 332 and an insertion surface 333. The mounting surface 331 and the insertion surface 333 are both parallel to the lower sidewall of the pick-up and put-out hole 33, and the distance between the mounting surface 331 and the lower sidewall is less than the distance between the insertion surface 333 and the lower sidewall. The limiting surface 332 connects the mounting surface 331 and the insertion surface 333 respectively.

[0094] Understandably, when the printhead body 2 needs to draw heat from the heating element 1 from the mounting base 3, the clamping member 24 passes through the through hole 104 and is inserted into the pick-and-place hole 33. At this time, the clamping member 24 is in limiting contact with the mounting surface 331. As it is inserted, the clamping member 24 rotates continuously, giving the third elastic member 247 a certain elastic potential energy. After being inserted into place, the printhead body 2 moves laterally in the horizontal direction, causing the clamping member 24 to move laterally within the pick-and-place hole 33. The clamping member 24 is also in limiting contact with the side wall of the through hole 104 in the horizontal direction, thus causing the heating element 1 to move laterally. Simultaneously, the clamping member 24 leaves the mounting surface 331 and abuts against the limiting surface 332. The limiting surface 332 is an inclined plane. During the lateral movement of the clamping member 24, the third elastic element 247 releases elastic potential energy, ensuring that the clamping member 24 remains abutted against the limiting surface 332. Therefore, during the lateral movement of the clamping member 24, it also gradually moves upward, thereby causing the hot-end device 1 to move upward as well. This causes the hot-end device 1 to move both laterally and upward simultaneously, thus disengaging from the fixed base 3. It is understood that the movement process when placing the hot-end device 1 back into the fixed base 3 is exactly the opposite of the movement process when removing the fixed base 3, and therefore will not be described further.

[0095] In one implementation, please refer to Figure 12 , Figure 14 and Figure 15 The hot end device 1 also includes a mounting member 102, which is located on the side of the hot end body 10 away from the heat sink 12, and forms a loading space 1021 with an opening.

[0096] In this embodiment, the fixing body 31 has an auxiliary hole 34, and the side wall of the auxiliary hole 34 has an auxiliary protrusion 341 protruding from the side wall surface. When the hot end device 1 is connected to the fixing body 31, the mounting member 102 is inserted into the auxiliary hole 34, and the auxiliary protrusion 341 is inserted into the loading space 1021, thereby limiting the hot end device 1 and ensuring the stability of the connection.

[0097] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A printhead for a 3D printer, characterized in that, The printhead includes: A hot-end device, comprising a heat sink, a heat conductor, a throat, and a nozzle, wherein the heat conductor is spaced apart from the heat sink, a portion of the throat contacts the heat conductor, another portion of the throat contacts the heat sink, and the nozzle is connected to the heat conductor and communicates with the throat; and The printhead body includes a base and a heating seat. The base is detachably connected to the hot end device. The heating seat is movably disposed on the base and has a heating groove. When the hot end device is connected to the base, the hot end device is at least partially located in the heating groove.

2. The printhead as described in claim 1, characterized in that, The printhead body also includes: A fixing rod, one end of which is disposed on the base and extends away from the base, the fixing rod and the heating seat are located on the same side of the base, and the heating seat is slidably disposed on the fixing rod.

3. The printhead as described in claim 2, characterized in that, The printhead body also includes: A first elastic element is sleeved on the fixed rod, and both ends of the first elastic element abut against the base and the heating base respectively. When the base and the hot end device are connected, the length of the first elastic element is less than the length of the first elastic element when the base and the hot end device are disassembled.

4. The printhead as described in claim 2, characterized in that, The printhead body also includes: A limiting member is provided at the other end of the fixing rod, and in a first direction that is not parallel to the extension direction of the fixing rod, the size of the limiting member is larger than the size of the fixing rod.

5. The printhead as described in claim 2, characterized in that, The heating base includes: A base, which is slidably disposed on the fixed rod, and the base having a receiving groove; A mounting housing, disposed within the receiving groove, wherein at least a portion of the heating groove is formed on the side of the mounting housing facing the hot end device, and the side of the mounting housing away from the hot end device, together with the base, defines the mounting groove; and A heating element is disposed within the mounting groove.

6. The printhead as described in claim 5, characterized in that, The heating base also includes: A spring is disposed in the mounting groove, the spring is connected to one side of the heating element, and the other side of the heating element abuts against the mounting shell.

7. The printhead as described in claim 5, characterized in that, The base includes: The main body has the receiving groove formed therein, and a support groove is provided on the side of the main body facing the base. The main body also has a through hole connecting the receiving groove and the support groove. A support base, wherein the support base is disposed within the support groove; wherein... The mounting shell has a limiting protrusion on the side facing the support body, and the through hole provides at least a partial path for the limiting protrusion to connect with the main body.

8. The printhead as described in claim 5, characterized in that, When the base is connected to the hot end device, the mounting shell and the heat-conducting element are in contact through a curved surface or multiple planes.

9. The printhead as described in claim 1, characterized in that, The heat-conducting component has a temperature measuring hole, and the heating base includes a temperature measuring protrusion for mounting a temperature measuring element. When the base is connected to the hot end device, the temperature measuring protrusion is at least partially located in the temperature measuring hole.

10. A three-dimensional printer, characterized in that, include: Multiple hot-end devices, wherein the hot-end devices are the hot-end devices of the printhead as described in any one of claims 1 to 9; A printhead body, wherein the printhead body is the printhead body of any one of claims 1 to 9; as well as A molding platform, which is movable relative to the print head body.

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