A material spraying device

Abstract

The utility model discloses a kind of material spraying devices, belong to 3D printing technical field;Including threaded connection pipe, threaded connection pipe lower end is fixedly installed with inner tube, inner tube lower end is fixedly installed with first conical part, inner tube and first conical part outside are all wound and installed with flat ribbon heating wire.The utility model is by spiral winding flat ribbon heating wire in inner tube and lower end first conical part outside, realized the overall heating and melting speed of the material in the spray head, flat ribbon heating wire covers the whole area of inner tube from upper end to lower end conical part, can directly transfer heat to inner tube after electrification, not only can accelerate the melting speed of material on the upper end of inner tube close to heater, also can synchronous heating material in the region of inner tube lower end and first conical part far from heater, avoid the situation that material far from heater end in spray head hardens after melting slowly, reduce material waste, shorten the preheating and material melting period when spray head is started again, improve the overall efficiency of 3D printing.

Description

Technical Field

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

[0002] The nozzle is one of the main components of a 3D printing machine. It is used to eject printing materials to form objects. The nozzle is installed at the bottom of the heater. The material is heated and melted by the heater and then enters the nozzle and is ejected from the bottom of the nozzle.

[0003] In existing technologies, after prolonged downtime, the material inside the nozzle hardens. When used again, it needs to be melted by a heater to clear the blockage. However, during the heating process, the material inside the nozzle melts quickly at the end near the heater and slowly at the end away. Due to the influence of unmelted material at the bottom, the initial discharge diameter is small. Only after the internal material is completely melted will the discharge diameter reach the required specification. All the material sprayed before it is completely melted is wasted, resulting in excessive material waste in the existing nozzle structure. Therefore, this application provides a spraying device to meet the requirements. Utility Model Content

[0004] The purpose of this invention is to provide a spraying device to solve the problems of slow melting speed and excessive material waste after the material inside the existing spraying device hardens.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0006] A spraying device includes a threaded connecting pipe, an inner cylinder fixedly installed at the lower end of the threaded connecting pipe, a first conical part fixedly installed at the lower end of the inner cylinder, a flat heating wire wound around the outer side of both the inner cylinder and the first conical part, and an outer cylinder sleeved on the outer side of the inner cylinder, the outer cylinder being located outside the flat heating wire.

[0007] Furthermore, a first flange is fixedly installed on the lower outer side of the aforementioned threaded connecting pipe, and a second flange is fixedly installed on the upper outer side of the outer cylinder. The second flange is located below the first flange, and the first flange and the second flange are connected by bolts.

[0008] Furthermore, an annular block is fixedly installed on the upper outer side of the inner cylinder. The outer diameter of the annular block is smaller than the inner diameter of the outer cylinder. Multiple docking blocks are fixedly installed on the outer side of the annular block. Multiple docking grooves are opened on the top of the outer cylinder. The docking blocks are inserted into the docking grooves, and the shapes of the docking blocks and docking grooves are compatible.

[0009] Furthermore, a regular hexagonal ring is fixedly installed at the lower outer end of the outer cylinder, and a second conical part is fixedly installed at the lower end of the outer cylinder. The second conical part is sleeved on the outside of the first conical part, and the outer diameter of the second conical part is larger than the outer diameter of the first conical part.

[0010] Furthermore, heat-conducting mechanisms are installed on the front and rear sides of the inner cylinder, which are used to increase the heat-conducting area of ​​the inner cylinder.

[0011] Furthermore, the aforementioned heat conduction mechanism includes two heat conduction covers located on the front and rear sides of the flat strip heating wire. The heat conduction covers are arc-shaped, and the inner wall of the heat conduction covers is in contact with the outer wall of the flat strip heating wire. Mounting strips are fixedly installed at both the upper and lower ends of the heat conduction covers. The mounting strips are detachably connected to the outer side of the inner cylinder. Multiple longitudinally arranged arc-shaped heat conduction strips are fixedly installed at the end of the heat conduction covers near the inner cylinder. The arc-shaped heat conduction strips are located in the gaps of the flat strip heating wire, and the inner wall of the arc-shaped heat conduction strips abuts against the outer wall of the inner cylinder.

[0012] Furthermore, extension blocks are fixedly installed on both sides of the aforementioned multiple arc-shaped heat-conducting strips. The extension blocks are arc-shaped, and the side of the extension block closest to the inner cylinder is in contact with the outer wall of the inner cylinder.

[0013] Furthermore, the mounting strip has mounting holes on its side, and multiple studs are fixedly installed on the outer wall of the inner cylinder. The studs are inserted into the mounting holes, and nuts are threaded on the outer side of the studs, pressing the nuts onto the mounting strip.

[0014] This utility model has the following beneficial effects:

[0015] (1) This utility model achieves overall heating and melting speed of the material inside the nozzle by spirally winding a flat heating wire around the outer side of the inner cylinder and the first conical part at the lower end. The flat heating wire covers the entire area of ​​the inner cylinder from the upper end to the lower conical part. After being powered on, it can directly transfer heat to the inner cylinder. This not only accelerates the melting speed of the material at the upper end of the inner cylinder near the heater, but also simultaneously heats the material at the lower end of the inner cylinder and the first conical part area away from the heater. This avoids the situation where the material at the end of the nozzle away from the heater hardens and melts slowly, reducing material waste. At the same time, it shortens the preheating and material melting cycle when the nozzle is restarted, improving the overall efficiency of 3D printing.

[0016] (2) By setting up a heat conduction mechanism, this utility model improves the uniformity of heating of the inner cylinder. On the one hand, the arc-shaped heat conduction cover is attached to the outer wall of the flat strip heating wire, which can collect the excess heat that is easily lost during the heating process and prevent the heat from being dissipated to the external environment. On the other hand, the arc-shaped heat conduction strip embedded in the spiral gap of the flat strip heating wire directly abuts against the outer wall of the inner cylinder, which can transfer heat to the area of ​​the inner cylinder that is not covered by the flat strip heating wire. With the extension blocks on both sides of the arc-shaped heat conduction strip attached to the inner cylinder, the heat conduction contact area is further expanded, and the heat conduction efficiency of the flat strip heating wire to the inner cylinder is increased. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the spraying device of this utility model;

[0018] Figure 2 This is a schematic diagram of the inner cylinder of this utility model;

[0019] Figure 3 This is a schematic diagram of the outer cylinder of this utility model;

[0020] Figure 4 This is a schematic diagram of the heat conduction mechanism of this utility model;

[0021] Figure 5 This is a cross-sectional structural diagram of the spraying device of this utility model;

[0022] Figure 6 for Figure 2 Enlarged view of point A in the middle.

[0023] In the diagram: 1. Threaded connecting pipe; 11. First flange; 2. Inner cylinder; 21. First conical part; 22. Annular block; 221. Butt joint block; 23. Stud; 24. Nut; 3. Outer cylinder; 301. Butt joint groove; 31. Second flange; 32. Regular hexagonal ring; 33. Second conical part; 4. Flat heating wire; 5. Heat conduction mechanism; 51. Heat conduction cover; 52. Mounting strip; 521. Mounting hole; 53. Arc-shaped heat conduction strip; 54. Extension block. Detailed Implementation

[0024] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0025] like Figures 1-5 As shown, an embodiment of this utility model provides a spraying device, including a threaded connecting pipe 1. An inner cylinder 2 is fixedly installed at the lower end of the threaded connecting pipe 1. A first conical part 21 is fixedly installed at the lower end of the inner cylinder 2. A flat heating wire 4 is wound around the outer side of both the inner cylinder 2 and the first conical part 21. An outer cylinder 3 is sleeved on the outer side of the inner cylinder 2. The outer cylinder 3 is located outside the flat heating wire 4. A wiring hole is opened on the surface of the outer cylinder 3. A wire is installed in the wiring hole. One end of the wire is connected to the flat heating wire 4. The flat heating wire 4 is connected to an external power source through the wire. The inner cylinder 2 is fixedly installed at the bottom of the heater through the threaded connecting pipe 1 to realize the installation of the nozzle. The material enters the interior of the inner cylinder 2 through the threaded connecting pipe 1. The flat heating wire 4 is spirally wound on the outer wall of the inner cylinder 2. Activating the flat heating wire 4 can heat the entire inner cylinder 2, which can melt the material inside the inner cylinder 2, accelerate the melting speed of the material inside the nozzle, avoid the situation where the material far from the heater end in the nozzle hardens and melts slowly, and reduce material waste.

[0026] like Figure 1-3As shown in this embodiment, a first flange 11 is fixedly installed on the lower outer side of the threaded connecting pipe 1, and a second flange 31 is fixedly installed on the upper outer side of the outer cylinder 3. The second flange 31 is located below the first flange 11. The first flange 11 and the second flange 31 are connected by bolts. By connecting the first flange 11 and the second flange 31 with bolts, the outer cylinder 3 can be fixed to the outside of the inner cylinder 2. The installation of the outer cylinder 3 on the outside of the inner cylinder 2 can protect the inner cylinder 2 and the flat strip heating wire 4, preventing the flat strip heating wire 4 from being exposed.

[0027] like Figure 3 and Figure 5 As shown in this embodiment, an annular block 22 is fixedly installed on the upper outer side of the inner cylinder 2. The outer diameter of the annular block 22 is smaller than the inner diameter of the outer cylinder 3. Multiple docking blocks 221 are fixedly installed on the outer side of the annular block 22. Multiple docking grooves 301 are opened on the top of the outer cylinder 3. The docking blocks 221 are inserted into the docking grooves 301, and the shape of the docking blocks 221 and the docking grooves 301 are adapted to each other. The outer cylinder 3 is sleeved from the bottom of the inner cylinder 2 to the outside of the inner cylinder 2, and the docking grooves 301 at the upper end of the outer cylinder 3 are aligned with the docking blocks 221 on the outside of the inner cylinder 2. The docking blocks 221 are snapped into the docking grooves 301, so that the holes inside the first flange 11 and the second flange 31 are aligned vertically for easy installation.

[0028] like Figure 1-3 and Figure 5 As shown, in this embodiment, a regular hexagonal ring 32 is fixedly installed on the lower outer side of the outer cylinder 3, and a second conical part 33 is fixedly installed on the lower end of the outer cylinder 3. The second conical part 33 is sleeved on the outside of the first conical part 21, and the outer diameter of the second conical part 33 is larger than the outer diameter of the first conical part 21. A wrench can be used to clamp the surface of the regular hexagonal ring 32 to drive the nozzle to rotate as a whole to complete the installation and disassembly. The second conical part 33 at the bottom of the outer cylinder 3 is sleeved on the outside of the first conical part 21. The second conical part 33 can protect the first conical part 21 and the flat strip heating wire 4 on the surface of the first conical part 21.

[0029] like Figure 2 and Figure 4 As shown in this embodiment, a heat conduction mechanism 5 is installed on the front and rear sides of the inner cylinder 2. The heat conduction mechanism 5 is used to increase the heat conduction area of ​​the inner cylinder 2. The heat conduction mechanism 5 collects the heat on the outer wall of the flat heating wire 4 and introduces it to the part of the inner cylinder 2 that is not in contact with the flat heating wire 4, thereby increasing the heat conduction area and heating speed of the inner cylinder 2, and thus accelerating the melting speed of the material.

[0030] like Figure 4As shown, in this embodiment, the heat-conducting mechanism 5 includes two heat-conducting covers 51. The heat-conducting covers 51 are located on the front and rear sides of the flat strip heating wire 4. The heat-conducting covers 51 are arc-shaped, and the inner wall of the heat-conducting covers 51 is in contact with the outer wall of the flat strip heating wire 4. Mounting strips 52 are fixedly installed at both the upper and lower ends of the heat-conducting covers 51. The mounting strips 52 are detachably connected to the outer side of the inner cylinder 2. Multiple longitudinally arranged arc-shaped heat-conducting strips 53 are fixedly installed at one end of the heat-conducting covers 51 near the inner cylinder 2. The arc-shaped heat-conducting strips 53 are located in the gaps of the flat strip heating wire 4. The inner wall of the heat-conducting strip 53 abuts against the outer wall of the inner cylinder 2. The heat-conducting cover 51 is detachably installed on the front and rear sides of the inner cylinder 2. The inner wall of the heat-conducting cover 51 contacts the outer wall of the flat heating wire 4 and absorbs the heat on the outer wall of the flat heating wire 4. The heat is transferred to the inner cylinder 2 through multiple arc-shaped heat-conducting strips 53 on the inner side of the heat-conducting cover 51. The arc-shaped heat-conducting strips 53 are installed between each layer of the spirally wound flat heating wire 4, which can increase the heat-conducting area of ​​the heat-conducting cover 51 to the inner cylinder 2, reduce heat loss, and improve the heating effect of the nozzle.

[0031] like Figure 4 As shown in this embodiment, extension blocks 54 are fixedly installed on both sides of multiple arc-shaped heat-conducting strips 53. The extension blocks 54 are arc-shaped, and the side of the extension block 54 close to the inner cylinder 2 is in contact with the outer wall of the inner cylinder 2. One end of the extension blocks 54 on both sides of the arc-shaped heat-conducting strips 53 abuts against the outer wall of the inner cylinder 2, which can further increase the contact surface between the heat-conducting mechanism 5 and the inner cylinder 2 and improve the melting efficiency of the inner cylinder 2 for the material inside it.

[0032] like Figure 6 As shown in this embodiment, the mounting strip 52 has mounting holes 521 on its side. Multiple studs 23 are fixedly installed on the outer wall of the inner cylinder 2. The studs 23 are inserted into the mounting holes 521. Nuts 24 are threaded on the outer side of the studs 23. The nuts 24 are pressed on the mounting strip 52. The studs 23 are installed on the surface of the inner cylinder 2. By fitting the mounting holes 521 in the mounting strip 52 onto the studs 23, and then pressing the nuts 24 onto the mounting strip 52 and rotating the nuts 24 to connect with the studs 23, the heat conduction cover 51 can be fixed on the inner cylinder 2.

[0033] Working principle: The heat conduction cover 51 is attached to the front and rear sides of the flat strip heating wire 4 on the outer side of the inner cylinder 2, so that the arc-shaped heat conduction strip 53 is embedded in the spiral gap of the flat strip heating wire 4 and the extension block 54 is attached to the outer wall of the inner cylinder 2. The heat conduction mechanism 5 is fixed by the mounting strip 52 on the stud 23 of the inner cylinder 2 through the mounting hole 521 and the nut 24 is tightened. Then, the outer cylinder 3 is put on from the bottom of the inner cylinder 2 upward, so that the mating groove 301 of the outer cylinder 3 is engaged with the mating block 221 of the annular block 22 of the inner cylinder 2. After the first flange 11 and the second flange 31 are aligned, they are fixed with bolts. Finally, the regular hexagonal ring 32 of the outer cylinder 3 is tightened with a wrench. The entire device is installed at the bottom of the heater through the threaded connecting pipe 1.

[0034] The material then enters the inner cylinder 2 through the threaded connecting pipe 1 and gathers downward into the first conical part 21, and then is ejected from the bottom of the first conical part 21 to achieve 3D printing;

[0035] When the flat heating wire 4 is not used for a long time, it is activated. Its spiral is wound around the outer side of the inner cylinder 2 and the first conical part 21. After being energized, it releases heat to directly heat the inner cylinder 2 to melt the internal material. At the same time, the arc-shaped heat-conducting cover 51 is attached to the outer wall of the flat heating wire 4 to collect excess heat and transfer it to the arc-shaped heat-conducting strip 53. The arc-shaped heat-conducting strip 53 conducts heat to the area of ​​the inner cylinder 2 that is not covered by the flat heating wire 4. The extension block 54 further increases the contact area with the inner cylinder 2 and improves the melting efficiency of the material in the inner cylinder 2.

[0036] Throughout the process, the outer cylinder 3 is fitted outside the flat strip heating wire 4 to prevent the flat strip heating wire 4 from being exposed and to reduce heat loss. The second conical part 33 provides protection for the first conical part 21.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A spraying device, characterized in that, include: A threaded connecting pipe (1) is provided with an inner cylinder (2) fixedly installed at the lower end of the threaded connecting pipe (1). A first conical part (21) is fixedly installed at the lower end of the inner cylinder (2). A flat strip heating wire (4) is wound around the outer side of both the inner cylinder (2) and the first conical part (21). An outer cylinder (3) is sleeved on the outer side of the inner cylinder (2). The outer cylinder (3) is located outside the flat strip heating wire (4). The inner cylinder (2) is equipped with a heat conduction mechanism (5) on the front and rear sides. The heat conduction mechanism (5) is used to increase the heat conduction area of ​​the inner cylinder (2). The heat conduction mechanism (5) includes two heat conduction covers (51). The heat conduction covers (51) are located on the front and rear sides of the flat strip heating wire (4). The heat conduction covers (51) are arc-shaped, and the inner wall of the heat conduction covers (51) is in contact with the outer wall of the flat strip heating wire (4). The upper and lower ends of the heat conduction covers (51) are fixedly installed with mounting strips (52). The mounting strips (52) are detachably connected to the outer side of the inner cylinder (2). The end of the heat conduction covers (51) near the inner cylinder (2) is fixedly installed with multiple longitudinally arranged arc-shaped heat conduction strips (53). The arc-shaped heat conduction strips (53) are located in the gap of the flat strip heating wire (4). The inner wall of the arc-shaped heat conduction strips (53) abuts against the outer wall of the inner cylinder (2).

2. The spraying device according to claim 1, characterized in that, The lower outer end of the threaded connecting pipe (1) is fixedly installed with a first flange (11), and the upper outer end of the outer cylinder (3) is fixedly installed with a second flange (31). The second flange (31) is located at the lower end of the first flange (11), and the first flange (11) and the second flange (31) are connected by bolts.

3. The spraying device according to claim 1, characterized in that, An annular block (22) is fixedly installed on the upper outer side of the inner cylinder (2). The outer diameter of the annular block (22) is smaller than the inner diameter of the outer cylinder (3). Multiple docking blocks (221) are fixedly installed on the outer side of the annular block (22). Multiple docking grooves (301) are opened on the top of the outer cylinder (3). The docking blocks (221) are inserted into the docking grooves (301), and the shapes of the docking blocks (221) and the docking grooves (301) are compatible.

4. The spraying device according to claim 1, characterized in that, A regular hexagonal ring (32) is fixedly installed on the lower outer side of the outer cylinder (3), and a second conical part (33) is fixedly installed on the lower end of the outer cylinder (3). The second conical part (33) is sleeved on the outside of the first conical part (21), and the outer diameter of the second conical part (33) is greater than the outer diameter of the first conical part (21).

5. The spraying device according to claim 1, characterized in that, Multiple arc-shaped heat-conducting strips (53) are fixedly installed with extension blocks (54) on both sides. The extension blocks (54) are arc-shaped, and the side of the extension block (54) close to the inner cylinder (2) is in contact with the outer wall of the inner cylinder (2).

6. The spraying device according to claim 1, characterized in that, The mounting strip (52) has a mounting hole (521) on its side. Multiple studs (23) are fixedly installed on the outer wall of the inner cylinder (2). The studs (23) are inserted into the mounting hole (521). Nuts (24) are threaded on the outer side of the studs (23). The nuts (24) are pressed on the mounting strip (52).

Images