3D glue printing device

Abstract

The utility model belongs to 3D printing technical field, specifically related to a 3D glue printing equipment, including the spray head mechanism suitable for glue printing equipment, be connected with the backflow mechanism on the spray head mechanism, the lower extreme of spray head mechanism is provided with the scraping mechanism for cleaning, wherein, the spray head mechanism includes the spray head, the lower extreme of spray head is connected with the nozzle, the upper end of spray head is installed the connector, the backflow mechanism installs in one side of connector, the backflow mechanism includes the backflow cylinder connected on the connector, the inside of backflow cylinder near one end of connector is provided with the connecting port, the utility model discloses through setting backflow mechanism on the spray head mechanism, when the spray head mechanism stops glue, backflow mechanism will start immediately, produces the vacuum, and the glue in the spray head mechanism is sucked back a part, thereby avoids the excessive glue in the spray head mechanism, and causes the dripping problem, improves the quality of product.

Description

Technical Field

[0001] This utility model belongs to the field of 3D printing technology, specifically relating to a 3D glue printing device. Background Technology

[0002] 3D adhesive printing is a rapid prototyping technology that builds three-dimensional solids by depositing liquid adhesive layer by layer. Its core component is the extrusion mechanism, which is responsible for stably and precisely extruding the adhesive from the storage tank onto the printing platform.

[0003] For example, Chinese Patent Application Publication No. CN120287578A discloses a 3D printing device and print head with a dispensing needle capable of 360° unrestricted rotation. This device includes an X-axis linear module, a Y-axis linear module, a Z-axis linear module, a platform, and a print head. The print head includes a vertical support plate, a fixed plate, a filament feeding device connecting plate, a rotating cylinder connecting plate, a pneumatic-electric slip ring support, a rotating arm, a filament feeding device, a rotating arm rotation drive motor, a pneumatic-electric slip ring, a pipe, a pipe fixing plate, an outer cylinder, a connecting sleeve, an upper bearing, a lower bearing, a drive gear, a driven gear, a fiber output needle, a dispensing needle connecting arm rotation drive motor, a small synchronous pulley, a synchronous belt, a large synchronous pulley, a dispensing needle connecting arm, a dispensing needle, a rotating hollow shaft, a glue tube, and a glue injection cylinder. This device aims to improve the mechanical structure and control method of the print head (dispensing needle) to achieve precise coating of complex paths or materials.

[0004] Existing extrusion mechanisms mostly use pneumatic pressurization or screw propulsion. However, because there is residual glue inside the print head, when the print head is moved and adjusted after printing stops, the glue on the print head is prone to "teardrop" phenomenon, causing glue to drip from places where it shouldn't be, resulting in product quality problems.

[0005] Therefore, it is necessary to develop a printhead structure that can effectively prevent printhead dripping in order to improve product quality. Utility Model Content

[0006] The purpose of this invention is to provide a 3D glue printing device that can effectively prevent the problem of printhead dripping.

[0007] The specific technical solution adopted in this utility model is as follows:

[0008] A 3D adhesive printing device includes a nozzle mechanism suitable for adhesive printing, a reflux mechanism connected to the nozzle mechanism, and a cleaning scraping mechanism at the lower end of the nozzle mechanism. The nozzle mechanism includes a nozzle, a nozzle connected to the lower end of the nozzle, and a connector mounted on the upper end of the nozzle. The reflux mechanism is mounted on one side of the connector and includes a reflux cylinder connected to the connector. A connection port is provided on the inner side of the reflux cylinder near the connector. A thin film is installed on the side of the reflux cylinder away from the connector. The interior of the reflux cylinder on the side of the thin film away from the connector is an inner chamber. A piston is slidably disposed within the inner chamber. A guide rod is connected to the side of the piston away from the connector, and the guide rod is slidably connected to the reflux cylinder.

[0009] In a preferred embodiment, the nozzle and the spray head are connected by a thread, and the nozzle has a cutting edge at the spray outlet.

[0010] In a preferred embodiment, the upper end of the connector is fitted with a connecting pipe for connecting to the glue storage tank.

[0011] In a preferred embodiment, the outer end of the guide rod is fitted to the metal sheet, and an electromagnet is installed on the outer end of the return cylinder in a direction away from the metal sheet, with the electromagnet and the metal sheet being magnetically connected.

[0012] In a preferred embodiment, the scraping mechanism includes a retaining strip rotatably connected to the nozzle, the lower end of the retaining strip being used to mount a scraper that cleans the nozzle, and the upper end of the scraper being mounted with a retainer for engaging with the retaining strip.

[0013] In a preferred embodiment, the upper end of the rotating shaft connected to the card strip is connected to a motor, the scraper has an "L" shaped structure, and the upper surface of the horizontal end of the scraper is fitted to the lower surface of the nozzle.

[0014] In a preferred embodiment, the electromagnet and the metal sheet are magnetically connected.

[0015] In a preferred embodiment, the scraper has an "L"-shaped structure, with the upper surface of the horizontal end of the scraper fitting against the lower surface of the nozzle.

[0016] The technical effects achieved by this utility model are as follows:

[0017] This invention incorporates a reflux mechanism on the nozzle mechanism. When the nozzle mechanism stops dispensing adhesive, the reflux mechanism immediately activates, creating a vacuum that draws back a portion of the adhesive from the nozzle mechanism. This prevents excessive adhesive residue from remaining in the nozzle mechanism, thus avoiding dripping problems and improving product quality. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this practical tool;

[0019] Figure 2 This is a half-section enlarged structural diagram of the connection between the nozzle mechanism and the recirculation mechanism in this practical invention;

[0020] Figure 3 This is a half-section enlarged structural schematic diagram of the practical reflux mechanism;

[0021] Figure 4 This is an exploded and enlarged structural diagram of the practical scraping mechanism;

[0022] Figure 5 This is a magnified cross-sectional schematic diagram of the practical spray head and nozzle.

[0023] The attached diagram lists the components represented by each number as follows:

[0024] 1. Nozzle mechanism; 2. Recirculation mechanism; 3. Scraping mechanism; 11. Nozzle; 12. Nozzle; 13. Connector; 14. Connecting pipe; 121. Blade; 21. Recirculation cylinder; 22. Connection port; 23. Membrane; 24. Inner chamber; 25. Piston; 26. Guide rod; 27. Metal sheet; 28. Electromagnet; 29. ​​Spring; 31. Locking strip; 32. Motor; 33. Scraper; 34. Locking seat. Detailed Implementation

[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0026] Many specific details are set forth in the following description in order to provide a full understanding of this utility model. However, this utility model may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of this utility model. The phrase "in a preferred embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments.

[0028] Secondly, this utility model is described in detail with reference to the schematic diagrams. When detailing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0029] Please see the appendix Figures 1 to 3 As shown, this utility model provides a 3D adhesive printing device, including a nozzle mechanism 1 suitable for adhesive printing, a reflux mechanism 2 connected to the nozzle mechanism 1, and a scraping mechanism 3 for cleaning at the lower end of the nozzle mechanism 1; wherein, the nozzle mechanism 1 includes a nozzle 11, a nozzle 12 connected to the lower end of the nozzle 11, and a connector 13 installed at the upper end of the nozzle 11; the reflux mechanism 2 is installed on one side of the connector 13, and the reflux mechanism 2 includes a reflux cylinder 21 connected to the connector 13, a connection port 22 is provided on the inner side of the reflux cylinder 21 near the connector 13, a diaphragm 23 is installed on the side of the connection port 22 away from the connector 13, the interior of the reflux cylinder 21 on the side of the diaphragm 23 away from the connector 13 is an inner chamber 24, a piston 25 is slidably arranged in the inner chamber 24, a guide rod 26 is connected to the side of the piston 25 away from the connector 13, and the guide rod 26 is slidably connected to the reflux cylinder 21.

[0030] Specifically, the upper end of the connector 13 is equipped with a connecting pipe 14 for connecting to the glue storage box; the outer end of the guide rod 26 is attached to the metal plate 27, and an electromagnet 28 is installed on the outer end of the return cylinder 21 away from the metal plate 27, and the electromagnet 28 and the metal plate 27 are magnetically connected.

[0031] In 3D printing, some printing equipment uses adhesive as the printing material. During printing, the adhesive is pushed from the storage tank into the nozzle mechanism 1 through pneumatic pressurization or screw propulsion. The adhesive is then sprayed out through the nozzle mechanism 1, and the adhesive continuously accumulates to form the product shape. However, when printing complex shapes, frequent start-stop operations are required. Even when the nozzle mechanism 1 stops dispensing material, adhesive remains in it, which can easily drip. To prevent dripping, a return mechanism 2 is installed on the nozzle mechanism 1. When the nozzle mechanism 1 stops dispensing material, the return mechanism 2 immediately starts. The method is as follows: when the electromagnet 28 is energized, it generates a magnetic force that attracts the metal sheet 27 on the guide rod 26, causing the guide rod 26 to extend towards the electromagnet 28. This causes the piston 25 to move towards the electromagnet 28, thereby increasing the volume of the inner chamber 24 between the piston 25 and the diaphragm 23. As the volume of one side of the inner chamber 24 increases, a negative pressure is generated, which causes the diaphragm 23 to deform and expand towards the piston 25. Since the diaphragm 23 is connected to the nozzle mechanism 1 through the connection port 22, the glue is drawn into the inner chamber 24 through the connection port 22, causing the glue in the nozzle mechanism 1 to flow back and preventing dripping.

[0032] When the nozzle mechanism 1 starts discharging material again, the electromagnet 28 in the return mechanism 2 immediately loses power and loses its magnetic force. Under the elastic force of the spring 29, the piston 25 moves towards the film 23, which reduces the volume of the inner chamber 24 between the piston 25 and the film 23, thereby reducing the negative pressure. This causes the film 23 to gradually return to its original shape. The adsorbed glue is also pushed back into the nozzle mechanism 1 for continued use when the film 23 returns to its original shape. The return mechanism 2 returns to its original state, making it easy to restart the return mechanism 2 when the nozzle mechanism 1 stops, so as to return the glue in the nozzle mechanism 1 and prevent the problem of dripping.

[0033] The function of the membrane 23 is to prevent the piston 25 from directly contacting the glue. Over time, the glue will seep between the piston 25 and the inner wall of the return cylinder 21, affecting the flexibility of the piston 25's movement. The membrane 23 can be made of elastic materials such as rubber or silicone.

[0034] In addition, the connector 13 in the nozzle mechanism 1 is used to install the connecting pipe 14, which is connected to the glue storage tank or the pump body. A control valve is also installed on the connecting pipe 14. When the nozzle mechanism 1 needs to stop discharging, the control valve will close, cutting off the passage between the nozzle mechanism 1 and the storage tank or the pump body. At the same time, the return mechanism 2 is started to return the glue.

[0035] The scraping mechanism 3 includes a retaining strip 31 rotatably connected to the nozzle 11. The lower end of the retaining strip 31 is used to install a scraper 33 that cleans the nozzle 12. The upper end of the scraper 33 is equipped with a retaining seat 34 for engaging with the retaining strip 31. The upper end of the rotating shaft connected to the retaining strip 31 is connected to a motor 32. The scraper 33 has an "L" shaped structure. The upper surface of the horizontal end of the scraper 33 is in contact with the lower surface of the nozzle 12.

[0036] In order to make the glue cutting more clean and neat when the nozzle mechanism 1 stops dispensing glue, a scraping mechanism 3 is provided on one side of the nozzle mechanism 1. When the nozzle mechanism 1 stops dispensing glue, the motor 32 in the scraping mechanism 3 drives the scraper 33 to rotate one end along the shaft at the lower end of the nozzle 12 to cut the glue sprayed out of the nozzle 12 and the glue that has not been sprayed out, thereby making the glue cutting of the nozzle 12 more clean and neat.

[0037] Some products have a relatively compact structure. When the scraper 33 is installed, it may cause the scraper 33 to come into contact with the product, resulting in damage to the product. Therefore, in this application, the scraper 33 is equipped with a retainer 34, which can be attached to the retainer strip 31 for installation or removal according to actual use needs, making the use more flexible.

[0038] Please see Figure 5 As shown, the nozzle 12 and the spray head 11 are connected by a thread, and the nozzle 12 is provided with a cutting edge 121 at the spray outlet.

[0039] When the product being produced is not suitable for the scraper 33, the nozzle 12 shown in the figure can be selected. The nozzle 12 has an inward contraction at the outlet and a cutting edge 121. When the glue stops dispensing, the glue retracts into the nozzle 12, which can cut the glue, making it easier to cut the glue.

[0040] In this utility model, both the electromagnet 28 and the motor 32 are connected to the control mechanism (not shown in the figure) of the 3D printing equipment via wired connection. The control mechanism controls the start and stop of the electromagnet 28 and the motor 32. The start and stop control of the electromagnet 28 and the motor 32 by the control mechanism are existing technologies and will not be described in detail here.

[0041] The working principle of this utility is as follows: In 3D printing, some printing equipment uses glue as a raw material for printing. During printing, the glue is pushed from the storage tank into the nozzle mechanism 1 by pneumatic pressure or screw propulsion. The glue is sprayed out through the nozzle mechanism 1 and continuously accumulates to form the product structure. However, when printing some complex graphics, frequent start and stop are required. When the nozzle mechanism 1 stops discharging, glue will still remain in the nozzle mechanism 1, which is prone to dripping.

[0042] To prevent dripping, a backflow mechanism 2 is installed on the nozzle mechanism 1. When the nozzle mechanism 1 stops spraying, the backflow mechanism 2 is immediately activated. The activation method of the backflow mechanism 2 is as follows: the electromagnet 28 is energized to generate magnetic force, which attracts the metal plate 27 on the guide rod 26, causing the guide rod 26 to extend towards the electromagnet 28. This drives the piston 25 to move towards the electromagnet 28, thereby increasing the volume of the inner chamber 24 between the piston 25 and the diaphragm 23. Due to the increased volume of the inner chamber 24, a negative pressure is generated, which attracts the diaphragm 23 to deform and expand towards the piston 25. Since the diaphragm 23 and the nozzle mechanism 1 are connected through the connection port 22, the glue is drawn into the inner chamber 24 through the connection port 22, causing the glue in the nozzle mechanism 1 to flow back and preventing dripping.

[0043] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the art.

Claims

1. A 3D adhesive printing device, characterized in that: Includes a nozzle mechanism (1) suitable for glue printing equipment, wherein a return mechanism (2) is connected to the nozzle mechanism (1), and a cleaning scraping mechanism (3) is provided at the lower end of the nozzle mechanism (1); The nozzle mechanism (1) includes a nozzle (11), the lower end of the nozzle (11) is connected to a nozzle (12), and the upper end of the nozzle (11) is equipped with a connector (13). The reflux mechanism (2) is installed on one side of the connector (13). The reflux mechanism (2) includes a reflux cylinder (21) connected to the connector (13). A connection port (22) is provided on the inner side of the reflux cylinder (21) near the connector (13). A membrane (23) is installed on the side of the connection port (22) away from the connector (13). The interior of the reflux cylinder (21) on the side of the membrane (23) away from the connector (13) is an inner chamber (24). A piston (25) is slidably arranged in the inner chamber (24). A guide rod (26) is connected on the side of the piston (25) away from the connector (13). The guide rod (26) is slidably connected to the reflux cylinder (21).

2. The 3D adhesive printing equipment according to claim 1, characterized in that: The nozzle (12) and the spray head (11) are connected by a thread, and the nozzle (12) has a cutting edge (121) at the spray outlet.

3. The 3D adhesive printing equipment according to claim 1, characterized in that: The upper end of the connector (13) is equipped with a connecting pipe (14) for connecting to the glue storage tank.

4. The 3D adhesive printing equipment according to claim 1, characterized in that: The outer end of the guide rod (26) is attached to the metal sheet (27), and an electromagnet (28) is installed on the outer end of the return cylinder (21) in a direction away from the metal sheet (27).

5. A 3D adhesive printing device according to claim 1, characterized in that: The scraping mechanism (3) includes a retaining strip (31) rotatably connected to the nozzle (11). The lower end of the retaining strip (31) is used to install a scraper (33) that cleans the nozzle (12). The upper end of the scraper (33) is equipped with a retainer (34) for engaging with the retaining strip (31).

6. A 3D adhesive printing device according to claim 5, characterized in that: The upper end of the rotating shaft connected to the card strip (31) is connected to a motor (32).

7. A 3D adhesive printing device according to claim 4, characterized in that: The electromagnet (28) and the metal sheet (27) are magnetically connected.

8. A 3D adhesive printing device according to claim 6, characterized in that: The scraper (33) has an "L" shaped structure, and the upper surface of the horizontal end of the scraper (33) is fitted to the lower surface of the nozzle (12).

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