A 3D printing device

Abstract

The utility model relates to a kind of 3D printing device, including by upper and lower bottom plate and column delta frame, parallel arm being slidably arranged in one end on column, driving component of driving parallel arm lifting, and nozzle connecting seat being set in the one end of parallel arm away from column;The side portion of the column is spaced apart and is provided with a plurality of horizontally arranged double-bar suspension frames in the circumferential direction;One nozzle assembly is detachably mounted on each double-bar suspension frame, the nozzle assembly includes top frame, nozzle main body being arranged at the bottom of top frame and first connecting piece and second connecting piece being arranged on top frame;Multiple nozzle assemblies are stored by the double-bar suspension frame circumferentially arranged on column, cooperate the double locking structure of nozzle connecting seat, utilize parallel arm and nozzle connecting seat self-moving to realize the automatic replacement of nozzle assembly, the utility model avoids the problem of multiple nozzle interference scraping by single working nozzle, and avoids the risk of blockage caused by material residue by physically replacing nozzle assembly.

Description

Technical Field

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

[0002] Fused Deposition Modeling (FDM) 3D printers, as one of the mainstream technologies, can be divided into two categories based on their nozzle configuration: single-nozzle and multi-nozzle. Single-nozzle printers have a simple structure and low cost, and are suitable for printing models made of a single material or without support, but they cannot achieve multi-material or multi-color composite printing. Multi-nozzle systems, by integrating multiple independent nozzles, support the collaborative printing of different colors or materials, expanding functionality and are widely used in industrial-grade equipment.

[0003] However, the integrated multi-nozzle design significantly increases mechanical complexity and cost, and still has inherent defects, such as: non-working nozzles are prone to scratching the formed model during printing; different materials have significant differences in melting temperature and fluidity, and when the independent temperature control of multiple nozzles is insufficient, the thermal fields of adjacent nozzles interfere with each other, which can easily cause the material in non-working nozzles to soften prematurely, leading to drooling or blockage.

[0004] Therefore, it is necessary to design a 3D printing device that can print on multiple materials and in multiple colors, while effectively avoiding nozzle interference and clogging problems. Utility Model Content

[0005] In order to overcome the shortcomings of the above-mentioned background technology, this utility model provides a 3D printing device that has the ability to print multiple materials and multiple colors, while effectively avoiding nozzle interference and clogging problems.

[0006] The technical implementation scheme of this utility model is as follows:

[0007] A 3D printing device includes a delta frame consisting of upper and lower base plates and a column, a parallel arm slidably mounted on the column at one end, a drive component for lifting and lowering the parallel arm, and a nozzle connector mounted on the end of the parallel arm away from the column. Multiple horizontally arranged double-bar suspensions are spaced circumferentially along the side of the column. Each double-bar suspension detachably mounts a nozzle assembly, which includes a top frame, a nozzle body mounted at the bottom of the top frame, and a first connector and a second connector mounted on the top frame. The side of the top frame has a transverse insertion hole adapted to the double-bar suspension for suspending the nozzle assembly on the double-bar suspension. The nozzle connector has a central hole with a diameter not less than the diameter of the nozzle body for receiving the nozzle body. Multiple first locking elements are arranged around the central hole on the upper surface of the nozzle connector, and a second locking element is arranged on the inner wall of the central hole. The first locking elements and the first connector, as well as the second locking elements and the second connector, can respectively form a releasable locking structure.

[0008] The device is configured such that: by moving the nozzle connector to the position of the target nozzle assembly on the double-bar suspension, the lower part of the nozzle body is inserted into the center hole, and the first connector is aligned and locked with the first locking member, and the second connector is aligned and locked with the second locking member, the nozzle assembly can be transferred to the nozzle connector by moving the nozzle connector away from the suspension position; conversely, by bringing the nozzle connector with the nozzle assembly close to the target double-bar suspension and inserting it into the transverse insertion hole, releasing the first and second locking members, the nozzle assembly can be left on the double-bar suspension by moving the parallel arm and the nozzle connector away from the suspension position.

[0009] More preferably, the first connector is a magnetic ball-head straight rod with the ball-head end facing downwards;

[0010] The first locking component includes two parallel magnetic rods with a gap between them, which is smaller than the diameter of the ball head. The ball head and the magnetic rods can be magnetically connected.

[0011] More preferably, the second connecting member is a circular ring plate, which is installed at the bottom of the top frame via a vertical tube. The circular ring plate has multiple radially outwardly extending extensions circumferentially on its side. The second locking member includes a retaining ring coaxially disposed in a central hole and a rotating mechanism for driving the retaining ring to rotate around its central axis. A baffle extending towards its center is provided on the inner side of the retaining ring. The inner diameter of the retaining ring is larger than the maximum radial dimension of the circular ring plate and the extensions. The diameter of the circular area enclosed by the baffle is larger than the outer diameter of the circular ring plate and smaller than the maximum radial dimension of the circular ring plate and the extensions. This allows the baffle to move above the extensions when the circular ring plate is inserted into and below the retaining ring, thereby achieving locking.

[0012] More preferably, the straight end of the magnetic ball head rod is provided with an external thread, and the bottom of the top frame is provided with a threaded blind hole that mates with the external thread.

[0013] More preferably, the magnetic rod has a shell with an open top on its outer side, and the shell is connected to the nozzle connecting seat through a slider groove structure.

[0014] More preferably, the upper end of the nozzle body is provided with a threaded part, the vertical pipe has an internal thread, and the nozzle body is fixed to the bottom of the vertical pipe by a threaded connection.

[0015] More preferably, the rotating mechanism includes a gear ring sleeved on the outside of the retaining ring, a servo motor fixed on the nozzle connecting seat, and a gear mounted on the output shaft of the servo motor and meshing with the gear ring.

[0016] More preferably, cooling mechanisms are also provided on both sides of the bottom of the nozzle connector.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. This utility model uses a double-rod suspension arranged circumferentially on the column to store multiple printhead assemblies. With the double locking structure of the printhead connector, the automatic replacement of printhead assemblies is achieved by using the parallel arm and the printhead connector itself to move. This utility model completely avoids the problem of interference and scratching of multiple printheads by using a single working printhead. At the same time, it avoids the risk of clogging caused by material residue by physically replacing the printhead assembly, which significantly improves the reliability and efficiency of multi-material printing.

[0019] 2. This utility model adopts a locking structure that combines a magnetic ball head straight rod with a parallel magnetic rod. The ball head adaptively deflects and embeds into the gap of the magnetic rod to achieve quick alignment and locking. The magnetic attraction ensures a stable connection. When unlocking, only the nozzle assembly needs to be vertically separated. There is no mechanical buckle friction loss, which significantly improves the replacement efficiency.

[0020] 3. This utility model uses a mechanical interlocking design between the extension of the circular plate and the rotating baffle. When the baffle rotates to the top of the extension, it forms multiple rigid limits, which has strong anti-vibration performance. When unlocking, the baffle radially avoids the extension, realizing zero-resistance separation of the nozzle assembly and completely avoiding the wear and accidental triggering risks of traditional snap-locking.

[0021] 4. The rotating mechanism of this utility model drives the retaining ring through gear meshing, and the servo motor controls the high-precision rotation angle to ensure that the locking position of the retaining plate and the extension is perfectly matched; the compact transmission layout avoids occupying extra space. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0023] Figure 2 This is a schematic diagram of the material tray, double-bar suspension and nozzle assembly of this utility model.

[0024] Figure 3 This is a schematic diagram of the nozzle assembly of this utility model assembled on the nozzle connector.

[0025] Figure 4 This is an assembly diagram of the nozzle assembly of this utility model.

[0026] Figure 5 This is a structural diagram of the nozzle connector assembly housing and magnetic rod of this utility model.

[0027] Figure 6 This is a schematic diagram of the rotating mechanism and retaining ring of this utility model.

[0028] The components in the attached diagram are labeled as follows: 100, upper and lower base plates; 110, column; 120, printing platform; 130, parallel arm; 140, drive component; 150, crossbeam; 200, nozzle connector; 210, center hole; 220, magnetic rod; 230, retaining ring; 231, baffle plate; 300, double-bar suspension; 400, nozzle assembly; 410, top frame; 411, horizontal insertion hole; 420, nozzle body; 430, vertical tube; 440, circular ring plate; 441, extension; 450, magnetic ball head straight rod; 460, material tray; 470, feeding motor; 500, housing; 510, slider groove structure; 600, cooling mechanism; 700, rotating mechanism; 710, gear ring; 720, servo motor; 730, gear. Detailed Implementation

[0029] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] like Figure 1-6 The 3D printing device shown includes a delta frame consisting of upper and lower base plates 100 and a column 110, a parallel arm 130, and a drive component 140. One end of the parallel arm 130 is slidably mounted on the column 110, and the other end is provided with a nozzle connecting seat 200. The bottom of the lower base plate 100 of the drive component 140 is connected to the parallel arm 130 for driving the parallel arm 130 to rise and fall. Multiple horizontally arranged double-bar suspensions 300 are provided on the side of the column 110 at intervals along the circumference. A printing platform 120 is installed at the center of the upper end of the lower base plate 100.

[0031] refer to Figure 1 and Figure 2 Each double-bar suspension 300 is detachably mounted with a nozzle assembly 400. Each nozzle assembly 400 is independently equipped with a material tray 460 and a feeding motor 470. The nozzle assembly 400 includes a top frame 410, a nozzle body 420 disposed at the bottom of the top frame 410, and a first connector and a second connector disposed on the top frame 410. The side of the top frame 410 is provided with a transverse insertion hole 411 adapted to the double-bar suspension 300 for suspending the nozzle assembly 400 on the double-bar suspension 300. The nozzle connecting seat 200 is provided with a central hole 210 in the middle with a diameter not less than that of the nozzle body 420 for receiving the nozzle body 420. The upper end face of the nozzle connecting seat 200 is provided with a plurality of first locking members around the central hole 210, and a second locking member is provided on the inner side wall of the central hole 210. The first locking members and the first connector, and the second locking members and the second connector can respectively form a releasable locking structure.

[0032] The device is configured such that by moving the nozzle connector 200 to the position of the target nozzle assembly 400 on the double-bar suspension 300, the lower part of the nozzle body 420 is inserted into the center hole 210, and the first connector is aligned and locked with the first locking member, and the second connector is aligned and locked with the second locking member. By moving the nozzle connector 200 away from the suspension position, the nozzle assembly 400 can be transferred onto the nozzle connector 200. Conversely, by bringing the nozzle connector 200 equipped with the nozzle assembly 400 close to the target double-bar suspension 300 and inserting it into the transverse insertion hole 411, and releasing the first and second locking members, the nozzle assembly 400 can be left on the double-bar suspension 300 by moving the parallel arm 130 and the nozzle connector 200 away from the suspension position.

[0033] The 3D printing device in this embodiment uses the Delta 3D printer frame as its basic structure, and is assembled from upper and lower base plates 100 and three columns 110. Each column 110 is equipped with a linear guide rail on its inner side. The drive component 140 consists of a servo motor and a synchronous belt, which is used to drive the parallel arm 130 to move up and down along the column to achieve Z-axis movement. The nozzle connector 200 is hinged to the end of the parallel arm 130. The nozzle connector 200 has a central hole 210, the diameter of which is slightly larger than the outer diameter of the nozzle body 420, for receiving or releasing the nozzle assembly 400.

[0034] A horizontal beam 150 is welded to the side wall of column 110 every 120° circumferentially (for reference). Figure 2 Each crossbeam 150 has a double-bar suspension 300 on one side near the inside of the frame; the three double-bar suspensions 300 are set at the same height. The suspension 300 consists of two parallel stainless steel round rods with rounded front ends and threaded rear ends, which are fitted with the horizontal insertion hole 411 on the side of the top frame 410 to achieve rapid suspension and positioning of the nozzle assembly 400.

[0035] refer to Figure 3 The first connecting component is a magnetic ball-head straight rod 450, with the ball end of the magnetic ball-head straight rod 450 facing downwards and the ball end being a magnetic steel ball; the top frame 410 is a triangular plate structure, with threaded blind holes opened around the bottom of the top frame 410, and the straight rod end of the magnetic ball-head straight rod 450 is provided with external threads, and the straight rod end of the magnetic ball-head straight rod 450 is screwed into the hole. The number of threaded blind holes corresponds one-to-one with the number of magnetic ball-head straight rods 450. In this embodiment, there are three of both, distributed at the three corners of the top frame 410.

[0036] refer to Figure 5The first locking component includes two parallel magnetic rods 220. Two magnetic rods 220 are positioned relative to the upper end face of the nozzle connecting seat 200 and the magnetic ball head rod 450, respectively. The distance between the rods is less than the diameter of the ball head. When the ball head is close to the magnetic rods 220, an elastic clamping magnetic structure is formed between them. When the nozzle connecting seat 200 descends to the target suspension 300, the ball head engages between the two magnetic rods 220, achieving the first locking and ensuring that the nozzle does not wobble during transfer.

[0037] refer to Figure 4 The nozzle body 420 has an external thread on its upper end. After being screwed into the internal thread of the vertical tube 430, the vertical tube 430 is then welded and fixed to the bottom of the top frame 410 to form a rigid integral part. A second connector is coaxially welded to the lower end of the vertical tube 430. In this embodiment, the second connector is a circular ring plate 440. Multiple radially outwardly extending extensions 441 are circumferentially arranged on the side of the circular ring plate 440. In this embodiment, three extensions 441 are evenly distributed. A second locking member is coaxially arranged in the central hole 210. The second locking member includes an annular retaining ring 230 and a rotating mechanism 700 that drives the retaining ring 230 to rotate around its central axis. A baffle 231 extending towards its center is provided on the inner side of the retaining ring 230. (Refer to...) Figure 5 and Figure 6 The rotating mechanism 700 includes a gear ring 710, a servo motor 720, and a gear 730. Specifically, a receiving annular groove and a gear cavity are radially formed inside the central hole 210. A retaining ring 230 is rotatably mounted in the receiving annular groove via bearing components. The gear 730 is assembled in the gear cavity via bearing components. Three baffles 231 are evenly distributed on the inner ring of the retaining ring 230. The outer ring of the retaining ring 230 is fitted and connected to the gear ring 710. The gear ring 710 meshes with the gear 730 on the output shaft of the servo motor 720. The servo motor 720 is fixed to the bottom wall of the printhead connector 200 by screws. When the annular plate 440 is inserted below the retaining ring 230, the servo motor 720 drives the retaining ring 230 to rotate a certain angle, and the baffles 231 rotate to the top of the extension 441, forming a mechanical latch for second locking, preventing the printhead from sinking or rotating during printing.

[0038] It should be noted that the inner diameter of the retaining ring 230 is greater than the maximum radial dimension of the annular plate 440 and the extension 441, and the diameter of the circular area enclosed by the baffle 231 is greater than the outer diameter of the annular plate 440 and less than the maximum radial dimension of the annular plate 440 and the extension 441; so that when the annular plate 440 is inserted into the retaining ring 230 and located below it, rotating the retaining ring 230 can move the baffle 231 above the extension 441, thereby achieving locking.

[0039] refer to Figure 5The magnetic rod 220 has a housing 500 with an open top on its outer side. The housing 500 is a U-shaped plastic part with an open top, and the open top has an arc-shaped structure that is lower in the middle and higher at both ends. The two sides of the housing 500 are slidably connected to the nozzle connecting seat 200 through a slider groove structure 510 (dovetail groove and T-shaped slider). The entire housing 500 can be disassembled. Miniature blower cooling mechanisms 600 are installed on both sides of the bottom of the nozzle connecting seat 200 (reference). Figure 1 and Figure 3 Its air outlet is aimed at the lower printing area of ​​the print head body 420 to cool the printing material.

[0040] In actual operation, the switching and repositioning of the nozzles are completed entirely by the parallel arm 130 and the nozzle connector 200 working together.

[0041] Working process: Before printing: The system issues a head-changing command, and the parallel arm 130 moves up and down along the column 110, aligning the printhead connector 200 with the target double-bar suspension 300; the printhead connector 200 moves upward, causing the printhead body 420 to be inserted into the center hole 210, while the ball head of the magnetic ball head rod 450 slides into the gap between the two magnetic rods 220, automatically forming a first lock; then the servo motor 720 drives the gear 730 to rotate the gear ring 710 by 30° to 60°, causing the baffle 231 to rotate above the extension 441 of the ring plate 440, completing the second lock. The entire locking process is completed within 3 seconds. Subsequently, the parallel arm 130 moves along the front end of the double-bar suspension 300, and the printhead assembly 400, together with the printhead connector 200, detaches from the suspension 300 and is directly put into printing.

[0042] After printing is completed: Parallel arm 130 approaches the empty double-bar suspension 300 again, bringing the carried printhead assembly 400 close to the empty suspension 300, aligning the horizontal insertion hole 411 with the double-bar suspension 300 for insertion, servo motor 720 rotates in the opposite direction to release the baffle 231, parallel arm 130 and printhead connector 200 move downwards, causing magnetic rod 220 to disengage from magnetic ball head rod 450, printhead assembly 400 is stably left in the double-bar suspension 300, printhead connector 200 rises unloaded, completing one full pick-and-place cycle.

[0043] The embodiments described above are merely preferred embodiments of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications, improvements, and substitutions without departing from the inventive concept, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A 3D printing device, characterized in that, The device includes a delta frame consisting of upper and lower base plates (100) and a column (110), a parallel arm (130) slidably mounted on the column (110) at one end, a drive component (140) for driving the parallel arm (130) to rise and fall, and a nozzle connecting seat (200) located at the end of the parallel arm (130) away from the column (110); characterized in that: the side of the column (110) is provided with a plurality of horizontally arranged double-bar suspensions (300) at intervals along the circumference; Each double-bar suspension (300) is detachably mounted with a nozzle assembly (400), the nozzle assembly (400) including a top frame (410), a nozzle body (420) disposed at the bottom of the top frame (410), and a first connector and a second connector disposed on the top frame (410); the side of the top frame (410) is provided with a transverse insertion hole (411) adapted to the double-bar suspension (300) for suspending the nozzle assembly (400) on the double-bar suspension (300); The nozzle connector (200) has a central hole (210) with a diameter not less than that of the nozzle body (420) for receiving the nozzle body (420); the upper end face of the nozzle connector (200) is provided with a plurality of first locking members around the central hole (210), and the inner sidewall of the central hole (210) is provided with a second locking member. The first locking member and the first connecting member, and the second locking member and the second connecting member can respectively form a releasable locking structure. By moving the nozzle connector (200) to the target bi-bar suspension (300), the nozzle assembly (400) can be transferred between the nozzle connector (200) and the bi-bar suspension (300).

2. The 3D printing apparatus according to claim 1, characterized in that, The first connector is a magnetic ball-head straight rod (450), with one end of the ball-head facing downwards; The first locking component includes two parallel magnetic rods (220), with a gap between the two magnetic rods (220) smaller than the diameter of the ball head, and the ball head and the magnetic rods (220) can be magnetically connected.

3. The 3D printing apparatus according to claim 1 or 2, characterized in that, The second connecting member is a circular ring plate (440), which is installed at the bottom of the top frame (410) through a vertical tube (430). The side of the circular ring plate (440) is provided with a plurality of radially outwardly extending extensions (441). The second locking member includes a retaining ring (230) coaxially disposed in the central hole (210), and a rotating mechanism (700) for driving the retaining ring (230) to rotate about its central axis; a baffle (231) extending toward its center is provided on the inner side of the retaining ring (230); The inner diameter of the retaining ring (230) is greater than the maximum radial dimension of the annular plate (440) and the extension (441); the diameter of the circular area enclosed by the baffle (231) is greater than the outer diameter of the annular plate (440) and smaller than the maximum radial dimension of the annular plate (440) and the extension (441); such that when the annular plate (440) is inserted into the retaining ring (230) and located below it, rotating the retaining ring (230) can move the baffle (231) above the extension (441), thereby achieving locking.

4. The 3D printing apparatus according to claim 2, characterized in that, The straight end of the magnetic ball head rod (450) is provided with an external thread, and the bottom of the top frame (410) is provided with a threaded blind hole that mates with the external thread.

5. The 3D printing apparatus according to claim 2, characterized in that, The magnetic rod (220) has a housing (500) with an open top on the outside. The housing (500) is connected to the nozzle connecting seat (200) through a slider groove structure (510).

6. The 3D printing apparatus according to claim 3, characterized in that, The upper end of the nozzle body (420) is provided with a threaded part, the vertical tube (430) has an internal thread, and the nozzle body (420) is fixed to the bottom of the vertical tube (430) by a threaded connection.

7. The 3D printing apparatus according to claim 3, characterized in that, The rotating mechanism (700) includes a gear ring (710) sleeved on the outside of the retaining ring (230), a servo motor (720) fixed on the nozzle connecting seat (200), and a gear (730) mounted on the output shaft of the servo motor (720) and meshing with the gear ring (710).

8. The 3D printing apparatus according to claim 1, characterized in that, Cooling mechanisms (600) are also provided on both sides of the bottom of the nozzle connector (200).

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