Ceramic product 3D printing head structure

Abstract

The utility model discloses a 3D printing head structure for ceramic products, and aims to overcome the defects that the discharging stability of a 3D printing head is poor, and the printing quality is affected. A material extrusion screw is installed in the printing cylinder, a feeding nozzle is arranged on the side wall of the printing cylinder, an extrusion nozzle is arranged at the lower end of the printing cylinder, the feeding nozzle is connected with an extrusion cylinder through a pipeline, and an extrusion piston is installed in the extrusion cylinder. Due to the double extrusion effect of the extrusion piston and the extrusion screw, printing materials can be stably and reliably extruded, the blocking phenomenon is avoided, and the printing quality of ceramic products can be guaranteed.

Description

Technical Field

[0001] The utility model relates to a ceramic product processing device, and more specifically, it relates to a ceramic product 3D printing head structure. Background Art

[0002] There are many ways to process ceramic products, but many ceramic products with complex structures are difficult to process using traditional processing methods. 3D printing technology can solve the problem of difficult processing of ceramic products with complex structures. 3D printing does not require molds required for injection molding, thus saving manufacturing time and costs. After three-dimensional modeling of ceramic products, the data is transmitted to the 3D printing device, which extrude paste-like printing materials through the 3D printing head and realizes the processing of ceramic products through accumulation. However, many 3D printing heads currently used have poor output stability, which affects the printing quality. Utility Model Content

[0003] In order to overcome the above-mentioned shortcomings, the utility model provides a 3D printing head structure for ceramic products. The 3D printing head can output materials stably and reliably, thereby ensuring the printing quality of the ceramic products.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions: a 3D printing head structure for ceramic products, including a printing cylinder, an extrusion screw is installed in the printing cylinder, a feed nozzle is arranged on the side wall of the printing cylinder, an extrusion nozzle is arranged at the lower end of the printing cylinder, the feed nozzle is connected to the extrusion cylinder through a pipeline, and an extrusion piston is installed in the extrusion cylinder.

[0005] During operation, the colloidal ceramic product printing material is loaded in the extrusion barrel, and the extrusion piston moves to extrude the printing material toward the feed nozzle into the printing barrel. The extrusion screw in the printing barrel rotates to realize the output of the printing material, so that the printing material is extruded from the extrusion nozzle to realize the printing of ceramic products. Traditional 3D print heads generally extrude the printing material outward through high pressure. This extrusion mode has poor stability in the actual working process, and the size of the extrusion pressure is unstable, which leads to uneven material output from the 3D print head, and the 3D print head will also be blocked, affecting the printing quality of ceramic products. In this patent application, the dual extrusion action of the extrusion piston and the extrusion screw is used, so that the printing material can be extruded stably and reliably without clogging, which is conducive to ensuring the printing quality of ceramic products.

[0006] Preferably, the extrusion nozzle comprises a nozzle sleeve and a fastening sleeve, the nozzle sleeve is a conical structure with a larger upper portion and a smaller lower portion, and the fastening sleeve is fastened between the nozzle sleeve and the printing cylinder.

[0007] The extrusion nozzle composed of a nozzle sleeve and a fastening sleeve is easy to install. The nozzle sleeve has a tapered structure with a larger upper part and a smaller lower part, which gathers the printed material, increases the pressure at the outlet, and facilitates the extrusion of the printed material.

[0008] Preferably, a convex ring protruding downward is provided at the lower end of the printing cylinder, the fastening sleeve is fastened to the convex ring, a positioning ring is sleeved outside the mouthpiece, a flange is provided on the fastening sleeve, and the positioning ring abuts between the flange and the outer wall of the mouthpiece.

[0009] The arrangement of the convex ring facilitates the installation of the fastening sleeve. The positioning ring abuts between the flange and the outer wall of the mouthpiece, ensuring the stability of the installation of the mouthpiece.

[0010] Preferably, the feed nozzle is arranged to be inclined upwards away from the printing cylinder.

[0011] The feed nozzle is tilted to facilitate the printing material to be squeezed into the printing cylinder.

[0012] Preferably, the lower end of the extrusion screw is gathered downward to form a conical structure; the drive motor is installed on the upper end of the printing cylinder, and the upper end of the extrusion screw is connected to the output shaft of the drive motor.

[0013] The lower end of the extrusion screw is conical, which is conducive to the extrusion of printing materials. The extrusion screw and the drive motor drive the rotation, which is stable and reliable.

[0014] Preferably, a hollow adapter is installed on the feed nozzle, a boss is provided on the outer wall of the adapter, one end of the boss is pressed against the end face of the feed nozzle, and the end of the pipe is pressed against the other end of the boss.

[0015] The setting of the adapter facilitates the connection between the feed nozzle and the pipeline. The boss plays a good limiting role.

[0016] Preferably, a slot is provided on the adapter, the slot is adapted to connect to a filter screen, the filter screen covers the inner hole of the adapter, and the filter screen and the adapter are detachably connected.

[0017] Install a filter in the hollow adapter to filter the printed material to prevent large particles of impurities from being squeezed into the print barrel. On the one hand, large particles of impurities are prone to cause blockage, and on the other hand, large particles of impurities are squeezed out and printed on ceramic products, affecting the quality of ceramic products.

[0018] Preferably, a closed frame is arranged around the filter screen, the closed frame is sealed and connected to the slot, a limiting convex edge is arranged at the outer end of the closed frame, and the limiting convex edge is supported on the outer wall of the adapter.

[0019] The sealing frame facilitates the installation of the filter and can improve the sealing performance of the filter after installation. The limiting convex edge supports the outer wall of the adapter for positioning, and at the same time facilitates the removal of the sealing frame from the adapter to clean the filter.

[0020] Preferably, a pneumatic cylinder is provided corresponding to the extrusion piston, a telescopic rod for telescopic movement is provided on the pneumatic cylinder, and the telescopic rod is connected to the extrusion piston.

[0021] A pneumatic cylinder is used as the power for the extrusion piston to move telescopically. The pressure is easy to control, and the telescopic rod of the pneumatic cylinder pushes and pulls the extrusion piston to move stably and reliably.

[0022] Preferably, a lower feeding hole is provided on the extrusion piston, a rotating cover plate is covered on the extrusion piston, upper feeding holes are provided on the rotating cover plate corresponding to the lower feeding hole, and the rotating cover plate rotates to realize the corresponding connection or staggered separation of the lower feeding holes.

[0023] When it is necessary to add printing material, the rotating cover plate rotates to make the lower feeding hole and the lower feeding hole correspondingly connected, and the printing material is added into the extrusion cylinder from the lower feeding hole and the lower feeding hole. After the addition is completed, the rotating cover plate rotates to make the lower feeding hole and the lower feeding hole staggered and separated. At this time, the lower feeding hole is blocked, which facilitates the movement of the extrusion piston to extrude the printing material in the extrusion cylinder. Through this structural setting, the extrusion piston does not need to be completely separated from the extrusion cylinder to achieve the addition and replenishment of printing material, which is more convenient to operate.

[0024] Compared with the prior art, the beneficial effects of the utility model are: (1) In the patent application, the printing material can be stably and reliably extruded by the dual extrusion action of the extrusion piston and the extrusion screw, and there will be no clogging, which is beneficial to ensuring the printing quality of ceramic products; (2) The printing material entering the feed nozzle is first filtered through a filter to prevent large particles of impurities from being extruded into the printing barrel. On the one hand, it can avoid clogging caused by large particles of impurities, and on the other hand, it can avoid large particles of impurities from being extruded onto the ceramic products and affecting the quality of the ceramic products; (3) The extrusion piston does not need to be completely separated from the extrusion barrel to achieve the addition and replenishment of printing material, which is more convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a cross-sectional view of Example 1 of the present utility model.

[0026] Figure 2 It is a structural schematic diagram of the printing cylinder of the utility model.

[0027] Figure 3 It is a cross-sectional view of Example 2 of the present utility model.

[0028] Figure 4 It is a cross-sectional view of Example 3 of the present utility model.

[0029] In the figure: 1, printing cylinder, 2, extrusion screw, 3, driving motor, 4, coupling, 5, connecting seat, 6, end cover, 7, through groove, 8, pit, 9, feed nozzle, 10, protrusion, 11, extrusion cylinder, 12, extrusion piston, 13, adapter, 14, boss, 15, slot, 16, filter, 17, closing frame, 18, limiting convex edge, 19, extrusion nozzle, 20, nozzle sleeve, 21, fastening sleeve, 22, convex ring, 23, positioning ring, 24, flange, 25, telescopic rod, 26, pneumatic cylinder, 27, lower feeding hole, 28, rotating cover plate, 29, upper feeding hole, 30, block, 31, convex ring. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0031] Embodiment 1: A ceramic 3D printing head structure (see attached Figure 1 , Attachment Figure 2 ), including a printing cylinder 1, an extrusion screw 2 is installed in the printing cylinder 1, a driving motor 3 is installed on the upper end of the printing cylinder 1, and the upper end of the extrusion screw 2 is connected to the output shaft of the driving motor 3. The output shaft of the driving motor 3 and the extrusion screw 2 are connected through a coupling 4. A connecting seat 5 is threadedly connected to the upper end of the printing cylinder 1, and an end cover 6 is arranged on the upper end of the connecting seat 5. The driving motor 3 is mounted on the end cover 6 on the connecting seat 5. The connecting seat 5 is a hollow structure, and the coupling 4 is placed in the connecting seat 5. A plurality of through grooves 7 are arranged at intervals on the side wall of the connecting seat 5 in the circumferential direction. A plurality of pits 8 are arranged at intervals on the lower outer wall of the connecting seat 5 in the circumferential direction.

[0032] A feed nozzle 9 is arranged on the side wall of the printing cylinder 1, and the feed nozzle 9 is arranged to be tilted upward away from the printing cylinder 1. The angle between the axis of the feed nozzle 9 and the axis of the printing cylinder 1 is 10 degrees to 80 degrees, and the angle between the axis of the feed nozzle 9 and the axis of the printing cylinder 1 in this embodiment is 76 degrees. A protrusion 10 extending upward away from the printing cylinder 1 is arranged at the position of the feed nozzle 9 on the side wall of the printing cylinder 1, and the feed nozzle 9 is arranged on the protrusion 10, and a thread is arranged on the inner wall of the feed nozzle 9. The feed nozzle 9 is connected to the extrusion cylinder 11 through a pipeline, and an extrusion piston 12 is installed in the extrusion cylinder 11. A hollow adapter 13 is installed on the feed nozzle 9, and the adapter 13 is threadedly connected and fastened to the feed nozzle 9. A boss 14 is arranged on the outer wall of the adapter 13, and one end of the boss 14 is pressed against the end face of the feed nozzle 9, and the end of the pipe is pressed against the other end of the boss 14. After the end of the pipe and the adapter 13 are assembled, they are fastened by a clamp.

[0033] The lower end of the printing cylinder 1 is provided with an extrusion nozzle 19, and the extrusion nozzle 19 includes a mouth sleeve 20 and a fastening sleeve 21. The mouth sleeve 20 is a tapered structure with a large upper part and a small lower part, and the fastening sleeve 21 is fastened between the mouth sleeve 20 and the printing cylinder 1. The lower end of the extrusion screw 2 is gathered downward to form a tapered structure, and the lower end of the extrusion screw 2 is placed in the mouth sleeve 20. The lower end of the printing cylinder 1 is provided with a downwardly protruding convex ring 22, which is an integral structure with the printing cylinder 1, and the outer diameter of the convex ring 22 is smaller than the outer diameter of the printing cylinder 1. The fastening sleeve 21 is fastened with the convex ring 22 by threads, and a positioning ring 23 is sleeved on the outer surface of the mouth sleeve 20. A flange 24 is provided on the fastening sleeve 21, and the positioning ring 23 abuts between the flange 24 and the outer wall of the mouth sleeve 20. The inner wall of the positioning ring 23 is inclined and adapted to the outer wall of the mouth sleeve 20. The outer wall of the lower end of the convex ring 22 is inclined to form a sealing surface, and the inner wall of the mouth sleeve 20 is adapted to the sealing surface and sealed.

[0034] The extrusion piston 12 is provided with a pneumatic cylinder 26 corresponding to the extrusion piston 12. The pneumatic cylinder 26 is provided above the extrusion piston 12. The pneumatic cylinder 26 is provided with a telescopic rod 25 that can be telescopically moved. The telescopic rod 25 is connected to the extrusion piston 12. The lower part of the extrusion cylinder 11 gradually decreases from top to bottom, and one end of the pipeline is connected to the lower end of the extrusion cylinder 11.

[0035] When working, the 3D printing head is installed on the 3D printing device, and the gelatinous ceramic product printing material is loaded in the extrusion cylinder 11. When the printing material is loaded, the extrusion piston 12 is moved upward to the top of the extrusion cylinder 11, and a loading gap is formed between the extrusion piston 12 and the upper end opening of the extrusion cylinder 11, and the printing material is loaded into the extrusion cylinder 11 from the loading gap. The extrusion piston 12 moves to extrude the printing material into the printing cylinder 1 toward the feed nozzle 9. The extrusion screw 2 in the printing cylinder 1 rotates to realize the output of the printing material, so that the printing material is extruded from the extrusion nozzle 19 to realize the printing of ceramic products. The traditional 3D printing head generally extrude the printing material outward through high pressure. This extrusion mode has poor stability in the actual working process, and the size of the extrusion pressure is unstable, which leads to uneven discharge of the 3D printing head, and the 3D printing head will also be blocked, affecting the printing quality of the ceramic products. In this patent application, the extrusion piston 12 and the extrusion screw 2 have dual extrusion effects, and the printing material can be stably and reliably extruded without clogging, which is conducive to ensuring the printing quality of ceramic products.

[0036] Embodiment 2: A ceramic 3D printing head structure (see attached Figure 3), including a printing cylinder 1, an extrusion screw 2 is installed in the printing cylinder 1, a driving motor 3 is installed on the upper end of the printing cylinder 1, and the upper end of the extrusion screw 2 is connected to the output shaft of the driving motor 3. The output shaft of the driving motor 3 and the extrusion screw 2 are connected through a coupling 4. A connecting seat 5 is threadedly connected to the upper end of the printing cylinder 1, and an end cover 6 is arranged on the upper end of the connecting seat 5. The driving motor 3 is mounted on the end cover 6 on the connecting seat 5. The connecting seat 5 is a hollow structure, and the coupling 4 is placed in the connecting seat 5. A plurality of through grooves 7 are arranged at intervals on the side wall of the connecting seat 5 in the circumferential direction. A plurality of pits 8 are arranged at intervals on the lower outer wall of the connecting seat 5 in the circumferential direction.

[0037] A feed nozzle 9 is arranged on the side wall of the printing cylinder 1, and the feed nozzle 9 is arranged to be tilted upward away from the printing cylinder 1. The angle between the axis of the feed nozzle 9 and the axis of the printing cylinder 1 is 10 degrees to 80 degrees, and the angle between the axis of the feed nozzle 9 and the axis of the printing cylinder 1 in this embodiment is 76 degrees. A protrusion 10 extending upward away from the printing cylinder 1 is arranged at the position of the feed nozzle 9 on the side wall of the printing cylinder 1, and the feed nozzle 9 is arranged on the protrusion 10, and a thread is arranged on the inner wall of the feed nozzle 9. The feed nozzle 9 is connected to the extrusion cylinder 11 through a pipeline, and an extrusion piston 12 is installed in the extrusion cylinder 11. A hollow adapter 13 is installed on the feed nozzle 9, and the adapter 13 is threadedly connected and fastened to the feed nozzle 9. A boss 14 is arranged on the outer wall of the adapter 13, and one end of the boss 14 is pressed against the end face of the feed nozzle 9, and the end of the pipe is pressed against the other end of the boss 14. After the end of the pipe and the adapter 13 are assembled, they are fastened by a clamp.

[0038] The lower end of the printing cylinder 1 is provided with an extrusion nozzle 19, and the extrusion nozzle 19 includes a mouth sleeve 20 and a fastening sleeve 21. The mouth sleeve 20 is a tapered structure with a large upper part and a small lower part, and the fastening sleeve 21 is fastened between the mouth sleeve 20 and the printing cylinder 1. The lower end of the extrusion screw 2 is gathered downward to form a tapered structure, and the lower end of the extrusion screw 2 is placed in the mouth sleeve 20. The lower end of the printing cylinder 1 is provided with a downwardly protruding convex ring 22, which is an integral structure with the printing cylinder 1, and the outer diameter of the convex ring 22 is smaller than the outer diameter of the printing cylinder 1. The fastening sleeve 21 is fastened with the convex ring 22 by threads, and a positioning ring 23 is sleeved on the outer surface of the mouth sleeve 20. A flange 24 is provided on the fastening sleeve 21, and the positioning ring 23 abuts between the flange 24 and the outer wall of the mouth sleeve 20. The inner wall of the positioning ring 23 is inclined and adapted to the outer wall of the mouth sleeve 20. The outer wall of the lower end of the convex ring 22 is inclined to form a sealing surface, and the inner wall of the mouth sleeve 20 is adapted to the sealing surface and sealed.

[0039] The extrusion piston 12 is provided with a pneumatic cylinder 26 corresponding to the extrusion piston 12. The pneumatic cylinder 26 is provided above the extrusion piston 12. The pneumatic cylinder 26 is provided with a telescopic rod 25 that can be telescopically moved. The telescopic rod 25 is connected to the extrusion piston 12. The lower part of the extrusion cylinder 11 gradually decreases from top to bottom, and one end of the pipeline is connected to the lower end of the extrusion cylinder 11.

[0040] The extrusion piston 12 is provided with a lower feeding hole 27, and the extrusion piston 12 is covered with a rotating cover plate 28, and the rotating cover plate 28 is rotated and fitted together with the telescopic rod 25, and the upper feeding hole 29 is correspondingly provided on the rotating cover plate 28 and the lower feeding hole 27, and the rotating cover plate 28 rotates to realize the corresponding connection or dislocation separation of the lower feeding hole 27 and the lower feeding hole 27. A clamping block 30 is fastened to the telescopic rod 25, and a convex ring 31 is provided on the edge of the upper feeding hole 29 on the rotating cover plate 28, and the clamping block 30 is clamped on the upper end of the convex ring 31 to realize the positioning and locking of the rotating cover plate 28.

[0041] During operation, the 3D printing head is mounted on the 3D printing device, and the gelatinous ceramic product printing material is loaded into the extrusion cylinder 11. When the printing material is loaded,

[0042] The rotating cover plate 28 rotates so that the lower feeding holes 27 and the lower feeding holes 27 are connected to each other. At this time, the upper end of the convex ring 31 is separated from the block 30, and the printing material is added from the lower feeding holes 27 and the lower feeding holes 27 to the extrusion cylinder 11. After the addition is completed, the rotating cover plate 28 rotates so that the lower feeding holes 27 and the lower feeding holes 27 are separated by displacement. At this time, the lower feeding holes 27 are blocked, and the upper end of the convex ring 31 is locked together with the block 30 to achieve positioning and locking, so that the extrusion piston 12 moves to extrude the printing material in the extrusion cylinder 11. Through this structural setting, the extrusion piston 12 does not need to be completely separated from the extrusion cylinder 11 to achieve the addition and replenishment of printing material, and the operation is more convenient.

[0043] After the addition of the printing material is completed, the extrusion piston 12 moves to extrude the printing material toward the feed nozzle 9 into the printing barrel 1. The extrusion screw 2 in the printing barrel 1 rotates to output the printing material, so that the printing material is extruded from the extrusion nozzle 19 to print ceramic products. Traditional 3D print heads generally extrude the printing material outward through high pressure. This extrusion mode has poor stability in the actual working process, and the size of the extrusion pressure is unstable, which leads to uneven discharge of the 3D print head, and the 3D print head will also be blocked, affecting the printing quality of ceramic products. In this patent application, the double extrusion action of the extrusion piston 12 and the extrusion screw 2 is used, so that the printing material can be extruded stably and reliably without clogging, which is conducive to ensuring the printing quality of ceramic products.

[0044] Embodiment 3: A ceramic 3D printing head structure (see attached Figure 4), including a printing cylinder 1, an extrusion screw 2 is installed in the printing cylinder 1, a driving motor 3 is installed on the upper end of the printing cylinder 1, and the upper end of the extrusion screw 2 is connected to the output shaft of the driving motor 3. The output shaft of the driving motor 3 and the extrusion screw 2 are connected through a coupling 4. A connecting seat 5 is threadedly connected to the upper end of the printing cylinder 1, and an end cover 6 is arranged on the upper end of the connecting seat 5. The driving motor 3 is mounted on the end cover 6 on the connecting seat 5. The connecting seat 5 is a hollow structure, and the coupling 4 is placed in the connecting seat 5. A plurality of through grooves 7 are arranged at intervals on the side wall of the connecting seat 5 in the circumferential direction. A plurality of pits 8 are arranged at intervals on the lower outer wall of the connecting seat 5 in the circumferential direction.

[0045] A feed nozzle 9 is arranged on the side wall of the printing cylinder 1, and the feed nozzle 9 is arranged to be tilted upward away from the printing cylinder 1. The angle between the axis of the feed nozzle 9 and the axis of the printing cylinder 1 is 10 degrees to 80 degrees, and the angle between the axis of the feed nozzle 9 and the axis of the printing cylinder 1 in this embodiment is 76 degrees. A protrusion 10 extending upward away from the printing cylinder 1 is arranged at the position of the feed nozzle 9 on the side wall of the printing cylinder 1, and the feed nozzle 9 is arranged on the protrusion 10, and a thread is arranged on the inner wall of the feed nozzle 9. The feed nozzle 9 is connected to the extrusion cylinder 11 through a pipeline, and an extrusion piston 12 is installed in the extrusion cylinder 11. A hollow adapter 13 is installed on the feed nozzle 9, and the adapter 13 is threadedly connected and fastened to the feed nozzle 9. A boss 14 is arranged on the outer wall of the adapter 13, and one end of the boss 14 is pressed against the end face of the feed nozzle 9, and the end of the pipe is pressed against the other end of the boss 14. After the end of the pipe and the adapter 13 are assembled, they are fastened by a clamp.

[0046] The adapter 13 is provided with a slot 15, which is adapted to connect with a filter screen 16, which covers the inner hole of the adapter 13, and the filter screen 16 is detachably connected to the adapter 13. A closed frame 17 is provided around the filter screen 16, which is sealed and connected to the slot 15, and a limiting convex edge 18 is provided at the outer end of the closed frame 17, which is supported on the outer wall of the adapter 13. The upper end of the slot 15 is exposed to the upper surface of the adapter 13. When installing, the closed frame 17 with the filter screen 16 installed is inserted from top to bottom into the slot 15, and the limiting convex edge 18 is supported on the outer wall of the adapter 13, and the limiting convex edge 18 is fastened to the adapter 13 by screws.

[0047] A filter screen 16 is installed in the hollow adapter 13 to filter the printed material to prevent large impurities from being squeezed into the printing tube 1. On the one hand, large impurities are easy to cause blockage, and on the other hand, large impurities are squeezed out and printed on ceramic products, affecting the quality of ceramic products.

[0048] The lower end of the printing cylinder 1 is provided with an extrusion nozzle 19, and the extrusion nozzle 19 includes a mouth sleeve 20 and a fastening sleeve 21. The mouth sleeve 20 is a tapered structure with a large upper part and a small lower part, and the fastening sleeve 21 is fastened between the mouth sleeve 20 and the printing cylinder 1. The lower end of the extrusion screw 2 is gathered downward to form a tapered structure, and the lower end of the extrusion screw 2 is placed in the mouth sleeve 20. The lower end of the printing cylinder 1 is provided with a downwardly protruding convex ring 22, which is an integral structure with the printing cylinder 1, and the outer diameter of the convex ring 22 is smaller than the outer diameter of the printing cylinder 1. The fastening sleeve 21 is fastened with the convex ring 22 by threads, and a positioning ring 23 is sleeved on the outer surface of the mouth sleeve 20. A flange 24 is provided on the fastening sleeve 21, and the positioning ring 23 abuts between the flange 24 and the outer wall of the mouth sleeve 20. The inner wall of the positioning ring 23 is inclined and adapted to the outer wall of the mouth sleeve 20. The outer wall of the lower end of the convex ring 22 is inclined to form a sealing surface, and the inner wall of the mouth sleeve 20 is adapted to the sealing surface and sealed.

[0049] The extrusion piston 12 is provided with a pneumatic cylinder 26 corresponding to the extrusion piston 12. The pneumatic cylinder 26 is provided above the extrusion piston 12. The pneumatic cylinder 26 is provided with a telescopic rod 25 that can be telescopically moved. The telescopic rod 25 is connected to the extrusion piston 12. The lower part of the extrusion cylinder 11 gradually decreases from top to bottom, and one end of the pipeline is connected to the lower end of the extrusion cylinder 11.

[0050] The extrusion piston 12 is provided with a lower feeding hole 27, and the extrusion piston 12 is covered with a rotating cover plate 28, and the rotating cover plate 28 is rotated and fitted together with the telescopic rod 25, and the upper feeding hole 29 is correspondingly provided on the rotating cover plate 28 and the lower feeding hole 27, and the rotating cover plate 28 rotates to realize the corresponding connection or dislocation separation of the lower feeding hole 27 and the lower feeding hole 27. A clamping block 30 is fastened to the telescopic rod 25, and a convex ring 31 is provided on the edge of the upper feeding hole 29 on the rotating cover plate 28, and the clamping block 30 is clamped on the upper end of the convex ring 31 to realize the positioning and locking of the rotating cover plate 28.

[0051] During operation, the 3D printing head is mounted on the 3D printing device, and the gelatinous ceramic product printing material is loaded into the extrusion cylinder 11. When the printing material is loaded,

[0052] The rotating cover plate 28 rotates so that the lower feeding holes 27 and the lower feeding holes 27 are connected to each other. At this time, the upper end of the convex ring 31 is separated from the block 30, and the printing material is added from the lower feeding holes 27 and the lower feeding holes 27 to the extrusion cylinder 11. After the addition is completed, the rotating cover plate 28 rotates so that the lower feeding holes 27 and the lower feeding holes 27 are separated by displacement. At this time, the lower feeding holes 27 are blocked, and the upper end of the convex ring 31 is locked together with the block 30 to achieve positioning and locking, so that the extrusion piston 12 moves to extrude the printing material in the extrusion cylinder 11. Through this structural setting, the extrusion piston 12 does not need to be completely separated from the extrusion cylinder 11 to achieve the addition and replenishment of printing material, and the operation is more convenient.

[0053] After the addition of the printing material is completed, the extrusion piston 12 moves to extrude the printing material toward the feed nozzle 9 into the printing barrel 1. The extrusion screw 2 in the printing barrel 1 rotates to output the printing material, so that the printing material is extruded from the extrusion nozzle 19 to print ceramic products. Traditional 3D print heads generally extrude the printing material outward through high pressure. This extrusion mode has poor stability in the actual working process, and the size of the extrusion pressure is unstable, which leads to uneven discharge of the 3D print head, and the 3D print head will also be blocked, affecting the printing quality of ceramic products. In this patent application, the double extrusion action of the extrusion piston 12 and the extrusion screw 2 is used, so that the printing material can be extruded stably and reliably without clogging, which is conducive to ensuring the printing quality of ceramic products.

[0054] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A ceramic 3D printing head structure, comprising a printing cylinder, characterized in that: An extrusion screw is installed in the printing cylinder, a feed nozzle is arranged on the side wall of the printing cylinder, an extrusion nozzle is arranged at the lower end of the printing cylinder, the feed nozzle is connected to the extrusion cylinder through a pipeline, and an extrusion piston is installed in the extrusion cylinder; The extrusion nozzle comprises a nozzle sleeve and a fastening sleeve. The nozzle sleeve is in a conical structure with a larger upper portion and a smaller lower portion. The fastening sleeve is fastened between the nozzle sleeve and the printing cylinder.

2. A ceramic product 3D printing head structure according to claim 1, characterized in that: A convex ring protruding downward is arranged at the lower end of the printing cylinder, the fastening sleeve is fastenedly connected with the convex ring, a positioning ring is arranged outside the mouth sleeve, a flange is arranged on the fastening sleeve, and the positioning ring abuts between the flange and the outer wall of the mouth sleeve.

3. The ceramic product 3D printing head structure according to claim 1, characterized in that: The feed nozzle is arranged to be inclined upwards away from the printing cylinder.

4. The ceramic product 3D printing head structure according to claim 1, characterized in that: The lower end of the extrusion screw is gathered downward to form a conical structure; the upper end of the printing cylinder is equipped with a driving motor, and the upper end of the extrusion screw is connected to the output shaft of the driving motor.

5. A ceramic product 3D printing head structure according to any one of claims 1 to 4, characterized in that: A hollow adapter is installed on the feed nozzle, a boss is arranged on the outer wall of the adapter, one end of the boss is pressed against the end surface of the feed nozzle, and the end of the pipeline is pressed against the other end of the boss.

6. A ceramic product 3D printing head structure according to claim 5, characterized in that: A slot is arranged on the adapter, the slot is adapted to connect the filter, the filter covers the inner hole of the adapter, and the filter and the adapter are detachably connected.

7. A ceramic product 3D printing head structure according to claim 6, characterized in that: A closed frame is arranged at the periphery of the filter screen, the closed frame is sealed and connected to the slot, a limiting convex edge is arranged at the outer end of the closed frame, and the limiting convex edge is supported on the outer wall of the adapter.

8. A ceramic product 3D printing head structure according to any one of claims 1 to 4, characterized in that: A pneumatic cylinder is arranged corresponding to the extrusion piston, a telescopic rod which can be telescopically moved is arranged on the pneumatic cylinder, and the telescopic rod is connected with the extrusion piston.

9. The ceramic product 3D printing head structure according to claim 8, characterized in that: A lower feeding hole is arranged on the extrusion piston, a rotating cover plate is covered on the extrusion piston, upper feeding holes are arranged on the rotating cover plate corresponding to the lower feeding hole, and the rotating cover plate rotates to realize the corresponding connection or staggered separation of the lower feeding holes.

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