Negative-pressure dirt suction cleaning device and negative-pressure suction head for nozzle of binder injection 3d (three-dimensional) printer

Abstract

The utility model discloses a binder jet 3d printer nozzle negative pressure dirt suction cleaning device and a negative pressure suction head, the negative pressure dirt suction cleaning device comprises a cleaning frame, the negative pressure suction head is arranged in the cleaning frame, the downstream of the negative pressure suction head is also provided with a wiping scraping strip, and the height of the upper end face of the wiping scraping strip is not less than the height of the upper end face of the negative pressure suction head. Through the arrangement, every time the cleaning frame moves to the position below the 3D printer nozzle, the negative pressure suction head can firstly adsorb dirt such as dust and residual adhesives on the nozzle face, then the wiping scraping strip can further wipe the nozzle face clean, and it is ensured that the nozzle is kept clean for next-time printing.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printing, in particular to a negative pressure dirt suction cleaning device for a nozzle of a binder jetting 3D printer and a negative pressure suction head. Background Art

[0002] During the operation of the binder jet metal 3D printer, in order to pursue the most accurate landing point of the inkjet droplets, the nozzle surface will be very close to the working powder surface. After the ink droplets are sprayed onto the working powder surface, some ultrafine powder (particle size is about 1 to 5 microns) will be splashed. Some dust will adhere to the nozzle surface. At this time, the conventional cleaning method of scraping the nozzle surface is adopted, which increases the risk of dust being scraped into the nozzle hole and blocking the nozzle hole. Dust is on the nozzle surface, and direct wiping also increases the chance of the nozzle surface being scratched. Therefore, before conventional wiping, it is hoped that there will be a way to remove the dust adhering to the nozzle surface as much as possible.

[0003] In addition, in order to keep the nozzle working smoothly, the nozzle will be pressed for a short time after each layer is printed, and some ink will be pressed out of the nozzle and stick to the nozzle surface. This ink needs to be wiped off. The wiping component will wipe from one end of the nozzle surface to the other end. There are two disadvantages in this process. One is that the dirt on the front end is accumulated and passes over the nozzle hole at the rear end. The second is that the dirt to be wiped is mainly adhesive. After the wiping component wipes multiple times, there will be adhesive residues accumulated on the wiping component. Therefore, it is expected that there will be a way to remove as much adhesive as possible on the nozzle surface before wiping. Summary of the invention

[0004] The utility model aims to solve the problems existing in the prior art and provide a negative pressure dirt suction cleaning device for a nozzle of a binder jetting 3D printer and a negative pressure suction head.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A negative pressure suction head comprises a suction head body, wherein an adsorption cavity is arranged in the suction head body, an adsorption slit is arranged on one end surface of the suction head body, the slit width of the adsorption slit does not exceed 1 mm, and the adsorption slit is connected to the adsorption cavity; a side surface of the suction head body is also provided with a pipe joint connected to the adsorption cavity, and the pipe joint is used to connect a negative pressure pipeline to a negative pressure source.

[0007] The negative pressure suction head can absorb dirt, especially dust and adhesive on the nozzle surface of the 3D printer nozzle, by setting the adsorption slit, so as to avoid the risk of the nozzle surface being scratched by dust due to directly wiping the nozzle surface of the nozzle with a scraper, and can also greatly reduce the adhesive residue on the nozzle surface.

[0008] Furthermore, the adsorption slits are a plurality of slits arranged in parallel and at intervals, and the intervals between the plurality of slits are matched with the positions of the nozzles on the nozzle of the 3D printer.

[0009] Furthermore, one end of the suction head body is an arc-shaped structure, the adsorption slit is arranged on the arc-shaped structure, and a plurality of connection and installation holes are also arranged on the suction head body.

[0010] Preferably, the width of the adsorption slit is 0.3-0.5 mm.

[0011] The utility model also provides a negative pressure suction cleaning device for a binder jetting 3D printer nozzle, comprising a cleaning frame, wherein the negative pressure suction head is arranged in the cleaning frame, and a wiping scraper is also arranged downstream of the negative pressure suction head, wherein the upper end surface height of the wiping scraper is not lower than the upper end surface height of the negative pressure suction head.

[0012] With such a setting, whenever the cleaning frame moves under the nozzle of the 3D printer, the negative pressure suction head can first absorb the dirt on the nozzle surface, such as dust and residual adhesive, and then the wiping scraper can further wipe the nozzle surface clean to ensure that the nozzle remains clean before the next printing.

[0013] Before conventional wiping, the negative pressure suction head removes the dust adhered to the nozzle surface as much as possible, reducing the chance of the nozzle surface being scratched by dust; before the wiping action, the adhesive on the nozzle surface can be effectively removed as much as possible, reducing the difficulty of subsequent wiping with the wiping strip, allowing the subsequent wiping strip to wipe more cleanly without residue.

[0014] Furthermore, the negative pressure suction head is installed on the inner wall of the cleaning frame, the wiping scraper is installed on the middle part of the cleaning frame through a scraper mounting seat, and the wiping scraper is arranged parallel to the adsorption slit on the negative pressure suction head.

[0015] Furthermore, one side of the cleaning frame is connected to the slider of the moving module through a connecting plate, and a photoelectric trigger switch is provided on the moving module, so that the cleaning frame can move back and forth so as to move to the bottom of the 3D printer nozzle, and give a signal of when to start the negative pressure suction head adsorption according to the feedback of the photoelectric trigger switch.

[0016] Furthermore, a spray assembly is installed on one side of the cleaning frame parallel to the wiping strip through a support seat, and the spray assembly faces the wiping strip and is used for cleaning the wiping strip.

[0017] Furthermore, the spray assembly includes a spray frame connected to the support seat, a water spray pipe is installed in the spray frame, a plurality of spray holes are provided on the water spray pipe, and one end of the water spray pipe extends out of the spray frame and is connected to a water source through a water pipe.

[0018] Furthermore, the negative pressure source includes a negative pressure bottle and a vacuum pump connected to the negative pressure bottle. The negative pressure bottle is connected to the negative pressure suction head via a negative pressure pipeline, and a solenoid valve is also provided on the negative pressure pipeline.

[0019] Compared with the prior art, the beneficial effects of the utility model are as follows: 1. The negative pressure suction head can absorb dirt, especially dust and adhesive on the nozzle surface of the 3D printer nozzle, by setting the suction slit, avoiding the risk of the nozzle surface being scratched by dust by directly wiping the nozzle surface of the nozzle with a scraper, and can also greatly reduce the adhesive residue on the nozzle surface; 2. The cleaning device is set in this way, and whenever the cleaning frame moves under the 3D printer nozzle, the negative pressure suction head can first absorb the dirt on the nozzle surface, and then the wiping scraper can further wipe the nozzle surface Wipe clean to ensure that the nozzle remains clean before the next print; 3. Before wiping, the negative pressure suction head removes the dust adhering to the nozzle surface as much as possible, reducing the chance of the nozzle surface being scratched by dust; before the wiping action, the adhesive on the nozzle surface can be effectively removed as much as possible, reducing the difficulty of subsequent wiping with the wiping strip, allowing the subsequent wiping strip to wipe more cleanly without residue; 4. The spray assembly can spray water to the wiping strip through the water spray pipe to clean the wiping strip to ensure that the wiping strip itself can remain clean after each cleaning of the nozzle surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of a negative pressure suction head of the utility model;

[0021] Figure 2 This is a schematic diagram of the structure of a negative pressure dirt suction cleaning device for a binder jetting 3D printer nozzle according to the utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the wiping scraper strip of the utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the water spray pipe of the utility model;

[0024] In the figure: 1. negative pressure suction head; 101. suction head body; 102. suction slit; 103. pipe joint; 104. connection and installation hole; 2. wiping scraper; 201. plug-in structure; 202. scraping part; 3. cleaning frame; 4. scraper mounting seat; 5. connecting plate; 6. moving module; 7. photoelectric trigger switch; 8. negative pressure pipeline; 9. negative pressure bottle; 10. solenoid valve; 11. support seat; 12. spray frame; 13. water pipe; 14. water spray pipe; 15. spray hole; 16. nozzle. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as "middle", "upper", "lower", "left", "right", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. Embodiment 1:

[0027] like Figure 1 As shown, a negative pressure suction head comprises a suction head body 101, wherein an adsorption cavity is arranged in the suction head body 101, and an adsorption slit 102 is arranged on one end surface of the suction head body 101, wherein the width of the adsorption slit 102 does not exceed 1 mm, and the adsorption slit 102 is connected to the adsorption cavity; a side surface of the suction head body 101 is further provided with a pipe joint 103 connected to the adsorption cavity, and the pipe joint 103 is used to connect the negative pressure pipeline to the negative pressure source.

[0028] The negative pressure suction head can absorb dirt, especially dust and adhesive on the nozzle surface of the 3D printer nozzle, by setting the adsorption slit 102, avoiding the risk of the nozzle surface being scratched by dust due to directly wiping the nozzle surface of the nozzle with a scraper, and can also greatly reduce the adhesive residue on the nozzle surface.

[0029] The suction head body 101 has an adsorption cavity, that is, an adsorption channel, so that the adsorption slit is connected to the pipe joint, the negative pressure pipeline and the negative pressure source, so that the adsorption slit can generate negative pressure to achieve the adsorption of dirt.

[0030] The adsorption slit 102 is set as a long strip-shaped slit so as to accurately adsorb the dirt on the nozzle surface. Because the nozzle surface of the 3D printer nozzle is also a relatively small and precise structure, such a slit can be well matched and used therewith.

[0031] For example, the adsorption slits 102 are two parallel and spaced apart. When the negative pressure suction head moves below the nozzle, the distance between the two adsorption slits is set corresponding to the position of the nozzle hole (nozzle surface) on the nozzle of the 3D printer.

[0032] Furthermore, the upper end of the suction head body 101 is an arc-shaped structure, and the adsorption slit 102 is arranged on the arc-shaped structure. The arrangement of the arc-shaped structure can avoid movement interference; the suction head body 101 is also provided with a plurality of connection and mounting holes 104, and the negative pressure suction head 1 can be installed in the cleaning frame using the connection and mounting holes 104.

[0033] Preferably, the width of the adsorption slit 102 is 0.5 mm. Embodiment 2:

[0034] This embodiment provides a negative pressure suction cleaning device for a binder jetting 3D printer nozzle, such as Figure 2 As shown, it includes a cleaning frame 3, in which the negative pressure suction head 1 is arranged, and a wiping strip 2 is also arranged downstream of the negative pressure suction head 1 (downstream refers to downstream relative to the direction of movement toward the nozzle), and the upper end surface height of the wiping strip 2 is not lower than the upper end surface height of the negative pressure suction head 1.

[0035] Through such a setting, whenever the cleaning frame moves under the 3D printer nozzle, the negative pressure suction head 1 can first absorb the dirt on the nozzle surface, such as dust and residual adhesive, and then the wiping scraper 2 can further wipe the nozzle surface clean to ensure that the nozzle remains clean before the next printing.

[0036] Before conventional wiping, the negative pressure suction head 1 removes the dust adhered to the nozzle surface as much as possible, reducing the chance of the nozzle surface being scratched by dust; before the wiping action, the adhesive on the nozzle surface can be effectively removed as much as possible, reducing the difficulty of subsequent wiping by the wiping strip 2, allowing the subsequent wiping strip 2 to wipe more cleanly without residue.

[0037] Furthermore, the negative pressure suction head 1 is installed on the inner wall of the cleaning frame 3 , the wiping scraper 2 is installed on the middle of the cleaning frame 3 through the scraper mounting seat 4 , and the wiping scraper 2 is arranged parallel to the adsorption slit on the negative pressure suction head 1 .

[0038] The wiping scraper 2 is arranged in the middle of the cleaning frame 3, so that the wiped dirt can fall into the cleaning frame 3 for subsequent centralized treatment. The wiping scraper 2 is a soft silicone scraper with a long length to ensure that each nozzle surface of the nozzle can be wiped.

[0039] like Figure 3 As shown, the bottom of the wiping strip 2 has a long strip-shaped plug-in structure 201, which can be easily installed on the strip mounting seat 4, and the upper part of the wiping strip 2 is provided with a scraping portion 202 with a triangular or conical cross-section.

[0040] Furthermore, one side of the cleaning frame 3 is connected to a slider of a moving module 6 via a connecting plate 5, and a photoelectric trigger switch 7 is provided on the moving module 6. The moving module can be a linear moving module, and a mature product available on the market is selected.

[0041] Through such an arrangement, the cleaning frame 3 can move back and forth so as to move to the bottom of the 3D printer nozzle, and give a signal of when to start the negative pressure suction head adsorption according to the feedback of the photoelectric trigger switch.

[0042] Furthermore, a spray assembly is installed on one side of the cleaning frame 3 parallel to the wiping strip 2 through a support seat 11, and the spray assembly faces the wiping strip and is used for cleaning the wiping strip.

[0043] Specifically, the spray assembly includes a spray frame 12 connected to the support seat 11, a water spray pipe 14 is installed in the spray frame 12, and a plurality of spray holes 15 (such as Figure 4 As shown in FIG. 1 , one end of the water spray pipe 14 extends out of the spray frame 12 and is connected to a water source through a water pipe 13. The aperture of the spray hole 15 is about 0.2 mm.

[0044] The spray assembly is fixedly arranged at the starting point of the cleaning frame 3. Each time the cleaning frame 3 returns to its original position, the spray assembly can spray water to the wiping strip 2 through the water spray pipe 14 to clean the wiping strip 2, so as to ensure that the wiping strip 2 itself can remain clean after each cleaning of the nozzle surface.

[0045] Furthermore, the negative pressure source includes a negative pressure bottle 9 and a vacuum pump connected to the negative pressure bottle 9 . The negative pressure bottle 9 is connected to the negative pressure suction head 1 via a negative pressure pipeline 8 . A solenoid valve 10 is also provided on the negative pressure pipeline 8 .

[0046] The negative pressure suction head 1 (the adsorption slit) is connected to the negative pressure bottle through the negative pressure pipeline (hose), and the negative pressure bottle is connected to the vacuum pump to keep the internal negative pressure at about -50KPA to -70KPA at all times. The solenoid valve 10 is a normally closed solenoid valve. When a trigger signal is received, the solenoid valve 10 opens for a set time period, during which the negative pressure bottle 9 is connected to the negative pressure suction head 1, and the adsorption slit 102 moves forward close to the nozzle surface of the nozzle 16. The negative pressure generated by the adsorption slit near the nozzle surface absorbs the dust and adhesive on the nozzle surface.

[0047] A typical working process of the cleaning device is as follows: when the print carriage of the nozzle completes one layer of printing, it returns to the starting point. The mobile module 6 of the cleaning device receives the instruction of the printing software and drives the cleaning frame 3 to move toward the nozzle 16. During the movement, the baffle of the photoelectric trigger switch 7 passes the photoelectric switch, and the cleaning device receives the trigger signal, opens the solenoid valve 10 connected to the negative pressure bottle 9 and maintains it for a set period of time, such as 3-5 seconds. After that, the negative pressure suction head 1 comes to the bottom of the nozzle 16, and sucks away the dirt on the nozzle surface while moving forward; the wiping strip 2 following the negative pressure suction head 1 wipes the nozzle surface clean. The mobile module 6 moves the cleaning frame 3 to the end and then returns to the starting point. Then the water spray pipe 14 of the spray assembly sprays a water column to rinse the wiping strip 2, and the cleaned sewage naturally flows downward into the cleaning frame 3. After the nozzle surface is wiped clean, the nozzle carriage can start printing the next layer.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A negative pressure suction head, characterized in that: It includes a suction head body, in which an adsorption cavity is arranged, and an adsorption slit is arranged on one end surface of the suction head body, wherein the width of the adsorption slit does not exceed 1 mm, and the adsorption slit is connected to the adsorption cavity; a side surface of the suction head body is also provided with a pipe joint connected to the adsorption cavity, and the pipe joint is used to connect the negative pressure pipeline to the negative pressure source.

2. The negative pressure suction head according to claim 1, characterized in that: The adsorption slits are multiple and parallel and spaced apart, and the spacing between the multiple adsorption slits matches the positions of the nozzles on the nozzle of the 3D printer.

3. The negative pressure suction head according to claim 1, characterized in that: One end of the suction head body is an arc-shaped structure, the adsorption slit is arranged on the arc-shaped structure, and a plurality of connection and installation holes are also arranged on the suction head body.

4. The negative pressure suction head according to claim 1, characterized in that: The width of the adsorption slit is 0.3-0.5 mm.

5. A negative pressure suction cleaning device for a binder jetting 3D printer nozzle having a negative pressure suction head according to any one of claims 1 to 4, characterized in that: It comprises a cleaning frame, in which the negative pressure suction head is arranged, and a wiping scraper is also arranged downstream of the negative pressure suction head, and the upper end surface height of the wiping scraper is not lower than the upper end surface height of the negative pressure suction head.

6. The negative pressure suction cleaning device for the nozzle of a binder jetting 3D printer according to claim 5, characterized in that: The negative pressure suction head is installed on the inner side wall of the cleaning frame, the wiping scraper is installed on the middle part of the cleaning frame through a scraper mounting seat, and the wiping scraper is arranged parallel to the adsorption slit on the negative pressure suction head.

7. The negative pressure suction cleaning device for the nozzle of a binder jetting 3D printer according to claim 5, characterized in that: One side of the cleaning frame is connected to a slider of a moving module through a connecting plate, and a photoelectric trigger switch is arranged on the moving module.

8. The negative pressure suction cleaning device for the nozzle of a binder jetting 3D printer according to claim 5, characterized in that: A spray assembly is also installed on one side of the cleaning frame parallel to the wiping scraper strip through a support seat, and the spray assembly faces the wiping scraper strip and is used for cleaning the wiping scraper strip.

9. The negative pressure suction cleaning device for the nozzle of a binder jetting 3D printer according to claim 8, characterized in that: The spray assembly comprises a spray frame connected to the support seat, a water spray pipe is installed in the spray frame, a plurality of spray holes are arranged on the water spray pipe, and one end of the water spray pipe extends out of the spray frame and is connected to a water source through a water pipe.

10. The negative pressure suction cleaning device for the nozzle of a binder jetting 3D printer according to claim 5, characterized in that: The negative pressure source comprises a negative pressure bottle and a vacuum pump connected to the negative pressure bottle. The negative pressure bottle is connected to the negative pressure suction head via a negative pressure pipeline. A solenoid valve is also provided on the negative pressure pipeline.

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