A heating block, a print head and a three-dimensional printer

Abstract

The application discloses a heating block, a printing head and a three-dimensional printer, and mainly realizes switching of various consumables by rotating a rotary valve. The main technical scheme of the application is as follows: a heating block comprises a heating block body, the heating block body comprises at least two feeding channels; a rotary valve comprises a valve port channel; a driving assembly is connected with the rotary valve, and the driving assembly is used for driving the rotary valve to rotate, so that the valve port channel is communicated with any feeding channel, and the consumable in the feeding channel is discharged through the valve port channel. The application is mainly used for switching of different consumables.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of 3D printing, in particular to a heating block, a print head and a three-dimensional printer. BACKGROUND

[0002] The nozzle spraying type 3D printer generally uses filament as the supply material, the printing wire is extruded and conveyed to the nozzle by the feeding mechanism, the nozzle melts the wire and moves along the part cross-section contour and the filling track, while extruding the melted material to realize layer-by-layer printing.

[0003] The conventional print head can only print one color, and when multiple colors need to be printed, the consumables of different colors need to be replaced. For example, the patent with the patent number CN113844030A discloses a 3D printer and a method for the 3D printer. When the consumables need to be replaced, the wire cutter cuts the wire into a first wire segment outside the wire channel and a second wire segment inside the wire channel, pushes the second wire segment to the first wire segment beyond the joint, and then pulls back the first wire segment. The replacement process is complicated and time-consuming, and the second wire segment is relatively long, which will cause waste of consumables. SUMMARY

[0004] Therefore, the embodiments of the present application provide a heating block, a print head and a three-dimensional printer, which are mainly used to solve the problem of complex consumable switching process.

[0005] To achieve the above-mentioned purpose, the present application mainly provides the following technical solutions:

[0006] In one aspect, the embodiments of the present application provide a heating block, comprising:

[0007] The heating block body comprises at least two feeding channels;

[0008] The rotary valve comprises a valve port channel;

[0009] The driving assembly is connected with the rotary valve, and is used to drive the rotary valve to rotate, so that the valve port channel is in communication with any feeding channel, so that the consumables in the feeding channel are discharged through the valve port channel.

[0010] The heating block body further comprises a mounting inner cavity, and the side wall of the mounting inner cavity is provided with a feeding channel, the feeding channel comprises a communication opening for discharging, and the mounting inner cavity further comprises a lower opening;

[0011] The rotary valve is arranged in the mounting inner cavity, the valve port channel comprises opposite first and second end openings, the first end opening corresponds to the side wall of the mounting inner cavity, and the second end opening of the valve port channel is arranged correspondingly with the lower opening;

[0012] The rotating valve is used for rotating, so that the first end opening of the valve port channel corresponds to the communication opening, and the valve port channel communicates with the feeding channel.

[0013] The axial direction of the rotating valve is the same as the axial direction of the installation inner cavity, and the shape of the side wall of the rotating valve matches the shape of the side wall of the installation inner cavity.

[0014] The installation inner cavity comprises a top hole and a bottom hole in communication, and the inner diameter of the bottom hole is smaller than the inner diameter of the top hole, so that a boss is formed between the bottom hole and the top hole, and an annular clamping groove is arranged on the boss.

[0015] The installation inner cavity further comprises an upper opening.

[0016] The driving assembly comprises a fixed assembly, a power member and a driving rod, the fixed assembly is connected with the heating block body, the power member is connected with the fixed assembly, one end of the driving rod is connected with the power member, and the other end of the driving rod is inserted into the installation inner cavity through the upper opening and connected with the rotating valve.

[0017] The driving rod is used for driving the rotating valve to rotate under the driving of the power member.

[0018] The heating block further comprises:

[0019] A heating rod is arranged in the installation inner cavity, and the heating rod abuts against the side wall of the installation inner cavity.

[0020] The fixed assembly abuts against the heating rod through the upper opening, and the fixed assembly and the installation inner cavity cooperate to fix the heating rod, and the heating rod is used for heating the consumables.

[0021] The fixed assembly comprises a first fixed frame and a second fixed frame, the first fixed frame is connected with the heating block body, the second fixed frame is connected with the first fixed frame, the power member is connected with the second fixed frame, the driving rod is movably connected with the first fixed frame and then inserted into the installation inner cavity.

[0022] The first fixed frame is used for abutting against the heating rod.

[0023] The at least two feeding channels are respectively located at different sides of the heating block body, and the different feeding channels are used for feeding consumables of different materials or different colors.

[0024] In another aspect, the present application also provides a printing head comprising the above-mentioned heating block and a feeding assembly.

[0025] The feeding assembly is connected with the feeding channel.

[0026] The feeding assembly comprises a throat pipe, a heat dissipation block, a connector and a guide pipe.

[0027] The throat is connected to the feed channel, the heat sink is connected to the throat, the guide tube passes through the heat sink and the throat, the guide tube is connected to the heat sink through a connector, and the guide tube is connected to the feed channel.

[0028] The guide tube is used for threading consumables;

[0029] The nozzle includes a discharge port, which is connected to the heating block body. The discharge port is configured to correspond with the valve port channel.

[0030] In another aspect, the present invention also provides a three-dimensional printer, characterized in that it includes the heating block described above, or the print head described above.

[0031] This invention discloses a heating block, printhead, and printer that are connected to different feed channels via valve ports. Consumables of different colors within the feed channels are discharged through the valve ports, enabling color switching. In existing technologies, the printhead can only print one color. When multiple colors are required, different colors of consumables need to be changed, a cumbersome and time-consuming process that wastes consumables. Compared with existing technologies, in this application, the consumable is extruded through the feeding channel and the valve port channel. When changing the color or material of the consumable, the drive component acts on the rotary valve. The rotary valve rotates, connecting the valve port channel with the feeding channel of the required consumable, thus extruding the required consumable and switching between different consumables. The process is simple and convenient, without the need for cutting off or retracting the consumable. It only requires extruding the original consumable in the valve port channel to replace the consumable, reducing waste and greatly shortening the consumable switching time. Moreover, the switching takes place in the heating block, which is part of the print head and is very close to the discharge point. The small amount of color consumable can be directly applied to the printing of the model. Even if it is not used after extrusion, the amount of consumable consumed is very small, reducing waste and meeting environmental protection requirements. Attached Figure Description

[0032] Figure 1 A schematic diagram of a printhead structure provided in an embodiment of the present invention;

[0033] Figure 2 This is an exploded view of the composition structure of a printhead provided in an embodiment of the present invention;

[0034] Figure 3 for Figure 1 The schematic diagram of the cross-sectional structure of the printhead shown in the AA direction;

[0035] Figure 4 for Figure 1 A schematic cross-sectional view of the heating block shown in the AA direction;

[0036] Figure 5 This is a schematic diagram of a heating block from a first-view perspective, provided as an embodiment of the present invention.

[0037] Figure 6 A structure schematic view of a heating block provided by an embodiment of the present application in a second perspective view;

[0038] Figure 7 A structure schematic view of a heating block provided by an embodiment of the present application in a second perspective view; Figure 5 A structure schematic view of a heating block provided by an embodiment of the present application in a second perspective view;

[0039] Figure 8 A structure schematic view of a rotary valve provided by an embodiment of the present application in a first perspective view;

[0040] Figure 9 A structure schematic view of a rotary valve provided by an embodiment of the present application in a second perspective view;

[0041] Figure 10 A structure schematic view of a heating block provided by an embodiment of the present application in a second perspective view; Figure 8 A structure schematic view of a heating block provided by an embodiment of the present application in a second perspective view;

[0042] Figure 11 An exploded schematic view of a rotary valve and a driving assembly in a feeding assembly provided by an embodiment of the present application;

[0043] Figure 12 An exploded schematic view of a feeding assembly provided by an embodiment of the present application;

[0044] Figure 13 An exploded schematic view of a heating block and a nozzle provided by an embodiment of the present application;

[0045] Figure 14 A structure schematic view of a nozzle provided by an embodiment of the present application;

[0046] Figure 15 A structure schematic view of a heating block provided by an embodiment of the present application in a second perspective view; Figure 14 A structure schematic view of a heating block provided by an embodiment of the present application in a second perspective view. DETAILED DESCRIPTION

[0047] In order to further explain the technical means and effects taken by the present application to achieve the predetermined purposes, the specific embodiments, structures, features and effects of the heating block according to the present application are described in detail as follows in combination with the drawings and preferred embodiments.

[0048] As shown in the drawings, the present application provides a heating block, which comprises: Figures 1-10 The heating block body 100 comprises at least two feeding channels 110;

[0049] The rotary valve 200 comprises a valve port channel 210;

[0050] The rotary valve 200 comprises a valve port channel 210;

[0051] A driving assembly 300 is connected with the rotary valve 200, and is configured to drive the rotary valve 200 to rotate, so that the valve port passage 210 is in communication with any one of the feed passages 110, and the consumable in the feed passage 110 is discharged through the valve port passage 210.

[0052] Different feed passages 110 can correspond to different colors of consumables or different materials of consumables, and switching of different colors and different materials of consumables can be realized. For the convenience of description, the heating block is used for multi-color printing, and the feed passages 110 correspond to different colors of consumables.

[0053] When it is necessary to switch the color of the consumable, the driving assembly 300 drives the rotary valve 200 to rotate, and the valve port passage 210 moves in position following the rotation of the rotary valve 200, so that the valve port passage 210 is in communication with the feed passage 110 at a different position, and thus the switching of the consumable in the different feed passages 110 is realized. For example, when the printing of the red consumable is completed and it is necessary to switch to the blue consumable, the driving assembly 300 drives the rotary valve 200 to rotate, the valve port passage 210 is in communication with the feed passage 110 of the red consumable and is cut off, and is in communication with the feed passage 110 of the blue consumable, so that the blue consumable can be extruded through the valve port passage 210, and the switching from the red consumable to the blue consumable is realized, and the red consumable does not need to be cut off and retracted.

[0054] The feed passage 110 and the valve port passage 210 can each be a circular hole-shaped passage with two ends open, as shown in Figures 5-7 The feed passage 110 has a feed opening 112 on the outer surface of the heating block body 100, and the feed opening 112 is configured to be connected with the feeding assembly 600. The feed passage 110 further includes a communication opening 111, and the feed passage 110 is configured to be in communication with the valve port passage 210 through the communication opening 111. The consumable is extruded by an extruder, is transmitted into the feed passage 110 through the feeding assembly 600, is then transmitted into the valve port passage 210 through the communication opening 111, and is finally extruded after entering the nozzle 700 through the valve port passage 210. The feed opening (112) and the communication opening (111) are the openings at the two ends of the feed passage (110).

[0055] The relative position of the rotary valve 200 and the heating block body 100 can be various, and the shape and orientation of the valve port channel 210 and the feed channel 110 can also be various. For example, the feed channel 110 is a channel extending vertically downward, the feed channel 110 has a corresponding communication opening 111 on the bottom surface of the heating block body 100, the rotary valve 200 is located outside the heating block body 100 and in sliding abutment with the bottom surface of the heating block body 100; or the heating block body 100 includes a mounting inner cavity 120, the feed channel 110 is a channel arranged obliquely, the feed channel 110 has a corresponding communication opening 111 on the side wall of the mounting inner cavity 120, and the rotary valve 200 is located in the mounting inner cavity 120 of the heating block body 100 and in sliding abutment with the side wall of the mounting inner cavity 120. Hereinafter, the technical solution of the heating block body with the mounting inner cavity will be described in detail.

[0056] It can be understood that the valve port channel 210 is only one, i.e. only one color of consumables can be extruded through the valve port channel 210. In one embodiment, the rotary valve 200 is in sliding abutment with the heating block body 100, when the valve port channel 210 is in communication with the feed channel 110 of the required color of consumables, the feed channel 110 of other colors of consumables will be blocked by the outer wall of the rotary valve 200. After printing is completed, the rotary valve 200 can be rotated to a position where the valve port channel 210 is not in communication with any feed channel 110, i.e. the area corresponding to the communication opening 111 between the valve port channel 210 and the feed channel 110, so as to achieve the blocking of all feed channels 110 by the rotary valve 200, avoiding the dripping of consumables in the feed channel 110. After switching the color of consumables, the valve port channel 210 will have residual consumables of the original color, and a certain length of the switched consumables will be extruded to extrude the residual consumables in the valve port channel 210. Since the valve port channel 210 is short, the amount of residual consumables is small, avoiding the waste of consumables and the time-consuming removal of residual consumables.

[0057] The heating block and the printing head provided by the embodiment of the present application are communicated with different feeding channels through valve port channels, and different colors of consumables in the feeding channels are discharged through the valve port channels to realize the switching of the colors of the consumables. In the prior art, the printing head can only print one color, and when multiple colors need to be printed, the feeding of different color consumables needs to be changed, and the changing process is complicated and time-consuming, and the consumables are wasted. Compared with the prior art, in the present application, the consumables are extruded after passing through the feeding channels and the valve port channels, and when the color of the consumables is changed, the driving assembly acts on the rotary valve, the rotary valve is rotated to make the valve port channel communicated with the feeding channel of the consumables of the required color, the extrusion of the consumables of the required color is realized, and the switching of the consumables of different colors is realized, the process is simple and convenient, the consumables are not cut off and drawn back, and only the original consumables in the valve port channel need to be extruded to realize the replacement of the consumables, the waste of the consumables is reduced, the switching time of the consumables is greatly shortened, and the switching is realized in the heating block, the heating block is part of the printing head, and is very close to the discharge place, the small amount of consumables of different colors can be directly applied to the printing of the model, even if the extrusion is not used, the consumables consumed are very small, the waste of the consumables is reduced, and the environmental protection requirement is met.

[0058] In an embodiment, as shown in Figures 5-7 The heating block body 100 further includes a mounting inner cavity 120, a feeding channel 110 is formed in the side wall of the mounting inner cavity 120, the feeding channel 110 includes a communication opening 111 for discharging, and the mounting inner cavity 120 further includes a lower opening 121. Figures 8-10 As shown in The rotary valve 200 is arranged in the mounting inner cavity 120, the valve port channel 210 includes opposite first and second end openings 211 and 212, the first end opening 211 corresponds to the side wall of the mounting inner cavity 120, and the second end opening 212 of the valve port channel 210 is arranged corresponding to the lower opening 121. The rotary valve 200 is used for rotating to make the first end opening 211 of the valve port channel 210 correspond to the communication opening 111, so that the valve port channel 210 is communicated with the feeding channel 110.

[0059] The installation inner cavity 120 can be a cylindrical inner cavity, the outer contour of the rotary valve 200 is cylindrical, the shape of the side wall of the rotary valve 200 matches the shape of the side wall of the installation inner cavity 120, and the consumables are prevented from leaking between the rotary valve 200 and the installation inner cavity 120. The lower opening 121 of the installation inner cavity 120 is located on the bottom surface of the heating block body 100, the bottom surface of the rotary valve 200 is located in the same plane as the lower opening 121 for the convenience of mounting the nozzle 700. The axial direction of the rotary valve 200 is the same as the axial direction of the installation inner cavity 120, so that the second end opening 212 of the valve port passage 210 is always correspondingly arranged with the lower opening 121 during the rotation of the rotary valve 200. For example, the center of the second end opening 212 is always located at the center of the lower opening 121. The feed passages 110 are inclinedly arranged and distributed on different sides of the installation inner cavity 120. For example, the four feed passages 110 can be uniformly distributed around the installation inner cavity 120. The four feed passages 110 have four corresponding communication openings 111 on the side wall of the installation inner cavity 120, and the four communication openings 111 can be uniformly distributed at the same height in the circumferential direction of the installation inner cavity 120. The first end opening 211 of the valve port passage 210 is located on the side wall of the rotary valve 200, and the second end opening 212 of the valve port passage 210 is located on the bottom surface of the rotary valve 200. The valve port passage 210 is a curved passage and plays a guiding role for the consumables. For example, when red consumables need to be printed, the rotary valve 200 is rotated to correspond to the communication opening 111 of the red consumables corresponding feed passage 110 at the first end opening 211, so that the red consumables corresponding feed passage 110 is communicated with the valve port passage 210. The red consumables in the feed passage 110 are sent to the valve port passage 210 in the inclined downward direction, and are extruded in the vertical downward direction after being guided by the valve port passage 210.

[0060] In an embodiment, as shown in Figures 3-4 、 Figure 7 and Figure 10 , the installation inner cavity 120 includes a top hole 125 and a bottom hole 126 in communication, the inner diameter of the bottom hole 126 is smaller than the inner diameter of the top hole 125, so that a boss 123 is formed between the bottom hole 126 and the top hole 125, the annular clamping groove 124 is arranged on the boss 123, the clamping head 220 is arranged on the rotary valve 200, the clamping head 220 is embedded in the clamping groove 124, and the clamping head 220 can rotate in the circumferential direction of the annular clamping groove 124.

[0061] The clamping head 220 is arranged at the top end of the rotary valve 200, that is, at the end of the rotary valve 200 opposite to the second end opening 212 of the valve port channel 210. The clamping head 220 includes an annular plate-shaped region extending away from the rotary valve 200 from the top end edge of the rotary valve 200, and an annular clamping region extending downward from the outer edge of the annular plate-shaped region, which is used to be embedded in the annular clamping groove 124, and at the same time, the annular plate-shaped region will abut against the edge of the annular clamping groove 124. As shown in Figure 7 The top hole 125 and the bottom hole 126 are both cylindrical through holes arranged in parallel in the vertical direction, with the top hole 125 located above the bottom hole 126, and the bottom hole 126 is provided with the feeding channel 110. The junction of the top hole 125 and the bottom hole 126 forms the above-mentioned boss 123. The boss 123 will limit the rotary valve 200 in the axial downward direction, and will not limit the rotary valve 200 in the circumferential direction, so that the rotary valve 200 can rotate in the circumferential direction in the installation inner cavity 120. In an embodiment, in order to ensure smooth rotation of the rotary valve 200 in the installation inner cavity 120, the diameter of the installation inner cavity 120 is 0.3-0.7 mm larger than the outer diameter of the rotary valve 200. Since the molten consumable has viscosity, it will not enter the installation inner cavity 120 between the rotary valve 200. At the same time, through the mutual limitation of the clamping head 220 and the clamping groove 124, the radial position of the rotary valve 200 is stable and will not shake in the radial direction, avoiding extrusion of the rotary valve 200 and the installation inner cavity 120 to cause poor rotation.

[0062] In an embodiment, as shown in Figures 3-4 and Figure 11 The installation inner cavity 120 further includes an upper opening 122. The drive assembly 300 includes a fixing assembly 310, a power member 320, and a drive rod 330. The fixing assembly 310 is connected with the heating block body 100, the power member 320 is connected with the fixing assembly 310, one end of the drive rod 330 is connected with the power member 320, and the other end of the drive rod 330 is inserted into the installation inner cavity 120 through the upper opening 122 and connected with the rotary valve 200. The drive rod 330 is used to drive the rotary valve 200 to rotate under the drive of the power member 320.

[0063] The power member 320 can be a motor. The rotary valve 200 is provided with a mounting hole 230 having an opening at the top end of the rotary valve 200, and is further provided with a top screw hole 240 penetrating the inner wall of the mounting hole 230 and the outer wall of the rotary valve 200. The top end of the drive rod 330 is connected with the rotating shaft of the motor through a shaft coupling, the bottom end of the drive rod 330 is inserted into the mounting hole 230, and the first top screw 810 is inserted into the top screw hole 240 to tightly press the drive rod 330, so that the drive rod 330 is fixed with the rotary valve 200. The fixing assembly 310 is connected with the top end of the heating block body 100 through bolts, and is located at the upper opening 122.

[0064] In one embodiment, as shown in Figures 3-4 and Figure 11 The heating block further comprises a heating rod 500, which is arranged on the heating block body 100 and used to generate and transfer heat to the heating block body 100. Specifically, the heating rod 500 is arranged in the mounting inner cavity 120 and abuts against the side wall of the mounting inner cavity 120. The fixing assembly 310 abuts against the heating rod 500 through the upper opening 122, and the fixing assembly 310 and the mounting inner cavity 120 cooperate to fix the heating rod 500, which is used for heating the consumables.

[0065] The heating rod 500 is in a cylindrical shape, is located in the mounting inner cavity 120, and is sleeved on the outer periphery of the driving rod 330, and has a gap between the heating rod 500 and the driving rod 330. The bottom surface of the heating rod 500 abuts against the upper surface of the boss 123, and the bottom surface of the heating rod 500 and the top surface of the rotary valve 200 have a gap, such as a gap with a width of 1-3 mm, to avoid affecting the rotation of the rotary valve 200.

[0066] As shown in Figure 6 and Figure 13 The heating block body 100 further comprises a temperature detection hole 510 for penetrating a thermistor 900, which abuts against the heating rod 500 and is used for detecting the temperature of the heating rod 500. The heating rod 500 is arranged in the mounting inner cavity 120, which increases the contact area between the heating rod 500 and the heating block body 100, so that the heating effect is better, and only one heating rod 500 can realize simultaneous heating of the consumables in the plurality of feeding channels 110 and valve port channels 210, which has a wide heating range and high efficiency.

[0067] In one embodiment, as shown in Figures 3-4 and Figure 11 The fixing assembly 310 comprises a first fixing frame 311 and a second fixing frame 312, the first fixing frame 311 is connected with the heating block body 100, the second fixing frame 312 is connected with the first fixing frame 311, the power member 320 is connected with the second fixing frame 312, and the driving rod 330 is movably penetrated through the first fixing frame 311 and inserted into the mounting inner cavity 120. The first fixing frame 311 is used for abutting against the heating rod 500.

[0068] The main body of the first fixing frame 311 is in a cylindrical tube shape, one end of the first fixing frame 311 comprises a connecting plate 313, the connecting plate 313 is used for being connected to the top surface of the heating block body 100 through a bolt, the connecting plate 313 abuts against the top end of the heating rod 500, and the connecting plate 313 and the boss 123 jointly limit the axial direction of the heating rod 500. The connecting plate 313 is further provided with a threading hole 314, and the first fixing frame 311 is provided with a recess 315 which is communicated with the threading hole 314, the connecting line of the heating rod 500 is led out through the threading hole 314, and the recess 315 is used for providing a wire routing space for the connecting line. The main body of the second fixing frame 312 is also in a cylindrical tube shape, the bottom end of the second fixing frame 312 is sleeved outside the top end of the first fixing frame 311 and is fixed through the second top screw 820. The motor is located in the inner cavity of the second fixing frame 312 and is fixed with the second fixing frame 312 through the third top screw 830. The fixing assembly 310 adopts the first fixing frame 311 and the second fixing frame 312 which are separated, so that the driving assembly 300 is convenient to install, and the first fixing frame 311 plays a heat insulation role on the motor in the second fixing frame 312, avoiding the influence of the heat of the heating rod 500 on the operation of the motor.

[0069] In an embodiment, the at least two feeding channels 110 are respectively located at different sides of the heating block body 100, and the different feeding channels 110 are used for feeding consumables of different materials or different colors.

[0070] On the one hand, after the feeding channel 110 is connected with the feeding assembly 600, the feeding channel 110 is located at different sides of the heating block body 100, so that the feeding assembly 600 is located at different sides of the heating block body 100, thereby playing a role in balancing the weight of the heating block and avoiding the inclination of the heating block. On the other hand, the feeding channel 110 is located at different sides of the heating block body 100, so that the distance between the feeding assemblies 600 is increased, thereby ensuring the heat dissipation of the feeding assemblies 600. The consumables corresponding to the feeding channel 110 can be consumables of different colors, which are used for multi-color printing, for example, different feeding channels 110 correspond to red consumables and blue consumables, etc. Alternatively, the consumables corresponding to the feeding channel 110 can be consumables of different materials, which are used for printing of different material combinations, for example, different feeding channels 110 correspond to PLA (polylactic acid), plastic, nylon, wooden material, etc.

[0071] On the other hand, as shown in Figures 1-3 Another aspect, the present application also provides a printing head, comprising the heating block of any one of the above and the feeding assembly 600. The feeding assembly 600 is connected with the feeding channel 110.

[0072] The feeding channel 110 has a feeding opening 112 on the outer surface of the heating block body 100, which is used to connect the feeding assembly 600, and the consumables are conveyed into the feeding channel 110 by the feeding assembly 600. In order to facilitate feeding and connection of the feeding assembly 600, the feeding channel 110 is arranged to be inclined upward in the direction close to the feeding opening 112, that is, the communication opening 111 is located at a lower position, and the feeding opening 112 is located at a higher position, so that the consumables can smoothly enter the valve port channel 210.

[0073] In an embodiment, as shown in Figure 12 The feeding assembly 600 includes a throat pipe 610, a heat dissipation block 620, a joint 630 and a guide pipe 640. The throat pipe 610 is connected with the feeding channel 110, the heat dissipation block 620 is connected with the throat pipe 610, the guide pipe 640 is connected with the heat dissipation block 620 and the throat pipe 610, the guide pipe 640 is connected with the heat dissipation block 620 through the joint 630, and the guide pipe 640 is communicated with the feeding channel 110. The guide pipe 640 is used to pass through the consumables.

[0074] One end of the throat pipe 610 is provided with external threads, and the feeding channel 110 is provided with internal threads. The throat pipe 610 is inserted into the feeding channel 110 through the feeding opening 112 and is threadedly connected with the feeding channel 110. The heat dissipation block 620 includes a plurality of parallel fins, which are used to dissipate heat of the throat pipe 610 and the guide pipe 640, so as to avoid heat of the heating block from being transmitted into the feeding assembly 600, and avoid that the consumables are prematurely melted to cause the melting distance of the consumables to be lengthened. The heat dissipation block 620 is sleeved on the throat pipe 610 and is fixed through the fourth jack 840. The guide pipe 640 can be a Teflon pipe.

[0075] In an embodiment, as shown in Figure 3 and Figures 13-15 The printing head further includes a nozzle 700, the nozzle 700 includes a discharge port 710, the nozzle 700 is connected with the heating block body 100, and the discharge port 710 is correspondingly arranged with the valve port channel 210.

[0076] In order to facilitate positioning and installation of the nozzle 700, the top surface of the nozzle 700 includes a limiting groove 720, and the discharge port 710 is located at the groove bottom of the limiting groove 720, as shown in Figure 7 The bottom surface of the heating block body 100 includes a limiting head 730, and the lower opening 121 is arranged on the limiting head 730. The limiting head 730 is inserted into the limiting groove 720, so that the groove bottom of the limiting groove 720 covers the lower opening 121 of the heating block body 100, and the discharge port 710 corresponds to the second end opening 212 of the valve port channel 210. The nozzle 700 is connected with the heating block body 100 through bolts, the consumables are extruded into the discharge port 710 through the valve port channel 210, and are discharged from the bottom end of the discharge port 710 to perform coating printing.

[0077] The present application mainly provides the following technical scheme:

[0078] In one aspect, the embodiment of the present application provides a heating block, comprising:

[0079] a heating block body 100, the heating block body 100 comprising at least two feeding channels 110;

[0080] a rotary valve 200, the rotary valve 200 comprising a valve port channel 210;

[0081] a driving assembly 300, the driving assembly 300 being connected with the rotary valve 200, the driving assembly 300 being used for driving the rotary valve 200 to rotate, so that the valve port channel 210 is communicated with any feeding channel 110, and the consumable in the feeding channel 110 is discharged through the valve port channel 210.

[0082] The heating block body 100 further comprises a mounting inner cavity 120, a side wall of the mounting inner cavity 120 is provided with the feeding channel 110, the feeding channel 110 comprises a communication opening 111 for discharging, and the mounting inner cavity 120 further comprises a lower opening 121;

[0083] The rotary valve 200 is arranged in the mounting inner cavity 120, the valve port channel 210 comprises opposite first and second end openings 211 and 212, the first end opening 211 corresponds to the side wall of the mounting inner cavity 120, and the second end opening 212 of the valve port channel 210 is arranged correspondingly to the lower opening 121;

[0084] The rotary valve 200 is used for rotating, so that the first end opening 211 of the valve port channel 210 corresponds to the communication opening 111, so that the valve port channel 210 is communicated with the feeding channel 110.

[0085] The rotary valve 200 is arranged in the mounting inner cavity 120, the valve port channel 210 comprises opposite first and second end openings 211 and 212, the first end opening 211 corresponds to the side wall of the mounting inner cavity 120, and the second end opening 212 of the valve port channel 210 is arranged correspondingly to the lower opening 121;

[0086] The mounting inner cavity 120 comprises a top hole and a bottom hole which are communicated, the inner diameter of the bottom hole is smaller than that of the top hole, so that a convex platform 123 is formed between the bottom hole and the top hole, an annular clamping groove 124 is arranged on the convex platform 123, a clamping head 220 is arranged on the rotary valve 200, the clamping head 220 is embedded in the clamping groove 124, and the clamping head 220 can rotate circumferentially in the annular clamping groove 124.

[0087] The mounting inner cavity 120 further comprises an upper opening 122;

[0088] The driving assembly 300 comprises a fixing assembly 310, a power piece 320 and a driving rod 330, the fixing assembly 310 is connected with the heating block body 100, the power piece 320 is connected with the fixing assembly 310, one end of the driving rod 330 is connected with the power piece 320, the other end of the driving rod 330 is inserted into the installation inner cavity 120 from the upper opening 122 and connected with the rotary valve 200;

[0089] The driving rod 330 is used for driving the rotary valve 200 to rotate under the driving of the power piece 320.

[0090] The heating block further comprises:

[0091] The heating rod 500 is arranged in the installation inner cavity 120, and the heating rod 500 abuts against the side wall of the installation inner cavity 120;

[0092] The fixing assembly 310 abuts against the heating rod 500 from the upper opening 122, and the fixing assembly 310 and the installation inner cavity 120 cooperate to fix the heating rod 500, and the heating rod 500 is used for heating the consumables.

[0093] The fixing assembly 310 comprises a first fixing frame 311 and a second fixing frame 312, the first fixing frame 311 is connected with the heating block body 100, the second fixing frame 312 is connected with the first fixing frame 311, the power piece 320 is connected with the second fixing frame 312, and the driving rod 330 is movably threaded through the first fixing frame 311 and inserted into the installation inner cavity 120;

[0094] The first fixing frame 311 is used for abutting against the heating rod 500.

[0095] The at least two feeding channels 110 are respectively located at different sides of the heating block body 100, and the different feeding channels 110 are used for feeding consumables of different materials or different colors.

[0096] In addition, the present application also provides a printing head comprising the heating block and a feeding assembly 600.

[0097] The feeding assembly 600 is connected with the feeding channel 110.

[0098] The feeding assembly 600 comprises a throat pipe 610, a heat dissipation block 620, a joint 630 and a guide pipe 640.

[0099] The throat pipe 610 is connected with the feeding channel 110, the heat dissipation block 620 is connected with the throat pipe 610, the guide pipe 640 is threaded through the heat dissipation block 620 and the throat pipe 610, the guide pipe 640 is connected with the heat dissipation block 620 through the joint 630, and the guide pipe 640 is in communication with the feeding channel 110.

[0100] The guide pipe 640 is used for threading the consumables.

[0101] The printhead further comprises:

[0102] The nozzle 700 comprises a discharge port 710, and the nozzle 700 is connected with the heating block body 100, and the discharge port 710 is arranged in correspondence with the valve port channel 210.

[0103] The application further provides a three-dimensional printer comprising the heating block or the printhead. It can be understood that the three-dimensional printer has all the beneficial effects of the heating block or the printhead, and the application will not be described again. It can be understood that the three-dimensional printer can further comprise other existing structures or subsequent innovative structures.

[0104] The above is only a specific embodiment of the application, but the protection scope of the application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the application, which should be covered within the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A heating block characterized by, The heating block comprises: a heating block body comprising at least two feeding channels; a rotary valve comprising a valve port channel; a driving assembly connected with the rotary valve, the driving assembly being used to drive the rotary valve to rotate, so that the valve port channel communicates with any one of the feeding channels, and the consumable in the feeding channel is discharged through the valve port channel; the heating block body further comprises a mounting inner cavity and a heating rod, the rotary valve and the heating rod being arranged in the mounting inner cavity, and the heating rod being located on one side of the top surface of the rotary valve; and a gap being formed between the bottom surface of the heating rod and the top surface of the rotary valve.

2. The heating block according to claim 1, wherein: the mounting inner cavity is provided with the feeding channels on the side wall thereof, the feeding channels comprising a communication opening for discharging, and the mounting inner cavity further comprising a lower opening; the valve port channel comprises opposite first and second end openings, the first end opening corresponding to the side wall of the mounting inner cavity, and the second end opening of the valve port channel being correspondingly arranged with the lower opening; the rotary valve is used to rotate, so that the first end opening of the valve port channel corresponds to the communication opening, so that the valve port channel communicates with the feeding channel.

3. The heating block according to claim 2, wherein: the rotary valve is axially the same as the mounting inner cavity, and the shape of the side wall of the rotary valve matches the shape of the side wall of the mounting inner cavity; the mounting inner cavity comprises a top hole and a bottom hole which are in communication, the inner diameter of the bottom hole being smaller than the inner diameter of the top hole, so that a boss is formed between the bottom hole and the top hole, the boss being provided with an annular clamping groove, the rotary valve being provided with a clamping head which is embedded in the clamping groove and can rotate circumferentially in the annular clamping groove.

4. The heating block according to claim 2, wherein: the mounting inner cavity further comprises an upper opening; the driving assembly comprises a fixed assembly, a power member and a driving rod, the fixed assembly being connected with the heating block body, the power member being connected with the fixed assembly, one end of the driving rod being connected with the power member, and the other end of the driving rod being inserted into the mounting inner cavity through the upper opening and connected with the rotary valve; the driving rod is used to drive the rotary valve to rotate under the driving of the power member.

5. The heating block of claim 4, wherein, The heating block further comprises: the heating rod abutting against the side wall of the mounting inner cavity; the fixed assembly abutting against the heating rod through the upper opening, the fixed assembly and the mounting inner cavity cooperating to fix the heating rod, and the heating rod being used to heat the consumable.

6. The heating block according to claim 5, wherein: the fixed assembly comprises a first fixed frame and a second fixed frame, the first fixed frame being connected with the heating block body, the second fixed frame being connected with the first fixed frame, the power member being connected with the second fixed frame, and the driving rod being inserted into the mounting inner cavity after being movably threaded through the first fixed frame; the first fixed frame is used to abut against the heating rod.

7. The heating block according to claim 1, wherein: At least two of the feeding channels are respectively located at different sides of the heating block body, and the different feeding channels are used to feed consumables of different materials or different colors.

8. A printhead, characterized by, The printing head comprises the heating block and a feeding assembly. The feeding assembly is connected with the feeding channels.

9. The printing head according to claim 8, wherein, The feeding assembly comprises a throat, a heat sink, a joint and a guide tube. The throat is connected with the feeding channels, the heat sink is connected with the throat, the guide tube is connected with the heat sink and the throat, the guide tube is connected with the heat sink through the joint, and the guide tube is in communication with the feeding channels. The guide tube is used to pass through the consumables. The printing head further comprises a nozzle, the nozzle comprises a discharge port, the nozzle is connected with the heating block body, and the discharge port is arranged corresponding to the valve port channel.

10. A three-dimensional printer, characterized by The printing head comprises the heating block or the printing head.

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