Rigid-connection quick nozzle changing device

Abstract

The utility model provides a rigidly-connected quick nozzle replacing device which has a protection function while reducing the thickness of a nozzle conveying pipe, and relates to the technical field of 3D printing. A quick-change nozzle is mounted at the bottom of the heating block; a conveying pipe is arranged at the top of the quick-change nozzle; a group of cooling fins are mounted at the top of the heating block; and fixing screws are screwed on the heating block and the radiating fins. According to the device, the overall stability and the durability of the quick-change nozzle can be improved, good coaxiality is provided, and the printing consumable wire conveying smoothness can be guaranteed through rigid connection.

Description

TECHNICAL FIELD

[0001] The utility model relates to 3D printing technical field especially relates to rigid connection's quick change nozzle device. BACKGROUND

[0002] FDM 3D printer can use powder metal plastic composite consumable silk or plastic consumable silk etc. Adhesive material constructs object through layer by layer printing, and nozzle is one of core parts of 3D printer, but because nozzle is easy to block, so it is designed as the structure of convenient replacement.

[0003] At present, the quick-change nozzle of 3D printer mostly adopts flexible connection mode, for example, the Revo hot end of British company E3D Online and the Rapid Changer quick-change nozzle matched with it. Compared with the problem of material leakage after replacing the nozzle of the traditional hot end, the Revo hot end avoids the risk of material leakage. In addition, the shaft centers of the new and old nozzles can maintain high coaxiality. Because the nozzle of E3D Revo is actually connected with the heat sink, the deviation of the shaft centers of the new and old nozzles is eliminated by the flexible connection of the heating assembly. This is conducive to the smoothness of 3D printing consumable silk conveying and the comfort of user installation. The flexible connection mode generally uses a spring for support and a silica gel sleeve for wrapping below. However, the E3D Revo has the problems of complex structure of the heating assembly, long replacement operation time, large gap between the nozzle and the heating assembly, and poor heat transfer effect. In addition, the nozzle in the flexible connection state is easy to break and has poor overall stability. The existing hot end on the market adopts rigid connection, which is difficult to meet the use requirements of quick nozzle replacement in terms of coaxiality, thereby affecting the 3D printing quality and the smoothness of consumable silk conveying. SUMMARY

[0004] The utility model provides rigid connection's quick change nozzle device, adds part between heat sink and heating block to build the closed frame of firm, provides protection for the nozzle of high -speed movement in the printing process, compared with other hot end products, nozzle material conveying pipe in the utility model no longer is directly stressed, and the wall thickness of nozzle material conveying pipe is reduced, compared with other hot end products, it can improve overall stability and the durability of quick-change nozzle, provides good coaxiality, and through rigid connection can guarantee the smoothness of printing consumable silk conveying.

[0005] The first aspect of the present disclosure provides a rigid connection quick-change nozzle device, which specifically comprises a heating block.

[0006] A quick-change nozzle is installed at the bottom of the heating block; a material conveying pipe is arranged at the top of the quick-change nozzle; a group of heat sinks is installed at the top of the heating block; and fixing screws are screwed on the heating block and the heat sinks.

[0007] In at least some embodiments, the main body part of the quick-change nozzle is hexagonal, the top of the quick-change nozzle is provided with threads matching the threaded holes in the bottom of the heating block, and the pitch of the threads connecting the main body part of the quick-change nozzle is at least twice.

[0008] In at least some embodiments, the upper end of the quick-change nozzle is smooth and has an outer diameter slightly smaller than the diameter of the inner hole of the heating block, and the outer diameter of the delivery pipe is also slightly smaller than the inner diameter of the central hole of the heat sink.

[0009] In at least some embodiments, the heating block is further provided with a vertical open slot on one side, and a needle cylinder filled with thermal conductive silicone can be used to add thermal conductive silicone to the open slot on one side of the circular heating block, so that the gap is filled with thermal conductive material.

[0010] In at least some embodiments, one side of the heating block can be provided with a vertical plane.

[0011] In at least some embodiments, the top of the heating block can be provided with a connecting plate, and the connecting plate can also be a U-shaped plate, and the fixing screws can pass through the round holes in the vertical plates on the left and right sides and be screwed into the threaded holes in the heat sink.

[0012] In at least some embodiments, the top of the heating block can be provided with a connecting plate, and the connecting plate can also be a U-shaped plate, and the fixing screws can pass through the round holes in the vertical plates on the left and right sides and be screwed into the threaded holes in the heat sink.

[0013] In at least some embodiments, the bottom of the heat sink is provided with a front-to-back open slot.

[0014] In at least some embodiments, the heat sink is fastened to the inside of the frame through the top wire at the bottom of the frame.

[0015] In at least some embodiments, the top of the heating block is provided with two horizontal threaded holes on the left and right sides, and the fixing screws can pass through the round holes on the outside of the heat sink and be screwed into the threaded holes on the left and right sides of the top of the heating block.

[0016] The rigidly connected quick-change nozzle device has the following beneficial effects:

[0017] The quick-change nozzle in the utility model is installed in a rigid connection mode, can realize the use effect of quick replacement of the nozzle, thereby improving the overall stability, and is connected with the heating block and the cooling fin through the low-thermal-conductivity plate or the isolation column, the hole coaxial with the heating block and the cooling fin is arranged on the connecting plate, the high coaxiality effect of the three components in the same axial direction can be realized, the smoothness of the printing consumable filament conveying can be ensured through the rigid connection, and the volume of the cooling fin can be effectively reduced while the cooling effect is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the drawings of the embodiments will be briefly introduced below.

[0019] The drawings in the following description only relate to some embodiments of the utility model, and are not limited to the utility model.

[0020] In the drawings:

[0021] Figure 1 The axial side schematic view of the assembled embodiment one of the application is shown;

[0022] Figure 2 The axial side schematic view of the disassembled embodiment one of the application is shown;

[0023] Figure 3 The axial side schematic view of the disassembled embodiment two of the application is shown;

[0024] Figure 4 The axial side schematic view of the disassembled embodiment three of the application is shown;

[0025] Figure 5 The axial side schematic view of the disassembled embodiment four of the application is shown;

[0026] Figure 6 The axial side schematic view of the disassembled embodiment five of the application is shown;

[0027] Figure 7 The axial side schematic view of the disassembled embodiment six of the application is shown;

[0028] Figure 8 The axial side schematic view of the disassembled embodiment seven of the application is shown;

[0029] Figure 9 The axial side schematic view of the disassembled embodiment eight of the application is shown;

[0030] Figure 10 The schematic view of the heating block adding the heat-conducting silicone grease in the embodiment one of the application is shown;

[0031] LIST OF REFERENCE NUMERALS

[0032] 1, heating block; 2, quick-change nozzle; 3, feed pipe; 4, connecting plate; 5, fixing screw; 6, isolation column; 7, cooling fin; 8, silicone grease adding syringe; 9, jackscrew. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme of the embodiments of the utility model will be described clearly and completely below in combination with the drawings of the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the described embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0034] Embodiment one: please refer to Figures 1-2 and Figure 10 :

[0035] The utility model discloses a rigid connection's quick-change nozzle device, comprising: heating block 1,

[0036] Heating block 1 bottom is installed with a quick-change nozzle 2, and heating block 1 is used for installing and fixing quick-change nozzle 2, and quick-change nozzle 2 is used for extruding 3D printing material;Quick-change nozzle 2 top is provided with a feed pipe 3, and the feed pipe 3 is used to convey 3D printing material downward into quick-change nozzle 2;Heating block 1 top is installed with a connecting plate 4 through fixing screw 5, and the connecting plate 4 is used for connecting heating block 1 with cooling fin 7;Connecting plate 4 top is installed with a group of cooling fins 7 through fixing screw 5, and fixing screw 5 is used for fastening connecting plate 4 and cooling fin 7, and cooling fin 7 is used for emitting the excess heat outward;Fixing screw 5 outside is also covered with isolation column 6, and isolation column 6 can reduce the efficiency of heat transmission to cooling fin.

[0037] In the embodiment of the present disclosure, as shown in Figure 1 and Figure 2 , the main part of the quick-change nozzle 2 is hexagonal, and the top of the quick-change nozzle 2 is also provided with a thread matching the thread hole at the bottom of the heating block 1, and the pitch of the thread connecting the main part of the quick-change nozzle 2 and the connecting thread is at least twice, so that the quick-change nozzle 2 can be screwed at the bottom of the heating block 1 through the thread during installation, and the hexagonal structure of the quick-change nozzle 2 can also facilitate the use of wrench to rotate it, and the double pitch can improve the connection strength and reduce the replacement operation time.

[0038] In the embodiment of the present disclosure, as shown in Figure 1 and Figure 2As shown, the upper end of the quick-change nozzle 2 is smooth and has an outer diameter slightly smaller than the diameter of the inner hole of the heating block 1, and the outer diameter of the material conveying pipe 3 is also slightly smaller than the inner diameter of the central hole of the heat dissipation fin 7. When assembled, the material conveying pipe 3 at the top of the quick-change nozzle 2 can pass through the circular hole in the middle of the heating block 1 and be inserted into the circular hole in the middle of the heat dissipation fin 7, and smoothness can also be ensured during insertion.

[0039] In the embodiments of the present disclosure, as shown in Figure 10 , a vertical open slot is also arranged on one side of the heating block 1. A needle cylinder 8 filled with heat-conducting silicone can be used to add heat-conducting silicone to the open slot on one side of the circular heating block 1, so that the gap between the heat-conducting material is filled, and the problem that the gap between the circular heating block and the heating pipe cannot be eliminated after installation is solved, and the porosity is also eliminated to help heat transfer.

[0040] The working principle of the present embodiment is as follows: when assembled, the connecting plate 4 is first installed on the top of the heating block 1 through the fixing screw 5, and then the heat dissipation fin 7 is installed on the top of the connecting plate 4 through the fixing screw 5, and the isolation column 6 is sleeved on the outer side of the fixing screw 5 between the connecting plate 4 and the heat dissipation fin 7 to reduce the efficiency of heat transfer to the heat dissipation fin. At this time, the material conveying pipe 3 at the top of the quick-change nozzle 2 can pass through the circular hole in the middle of the heating block 1 and be inserted into the circular hole in the middle of the heat dissipation fin 7, and finally the quick-change nozzle 2 is screwed at the bottom of the heating block 1 to complete the assembly. When the quick-change nozzle 2 needs to be replaced later, it can be replaced by simply unscrewing it.

[0041] In the embodiments of the present disclosure, as shown in Figure 3 , a vertical plane is arranged on one side of the heating block 1. When installed, the heating block 1 can also rely on the plane on one side to cooperate with other heating and temperature measuring components to achieve heating effect.

[0042] The working principle of the present embodiment is as follows: when assembled, the connecting plate 4 is first installed on the top of the heating block 1 through the fixing screw 5, and then the heat dissipation fin 7 is installed on the top of the connecting plate 4 through the fixing screw 5, and the isolation column 6 is sleeved on the outer side of the fixing screw 5 between the connecting plate 4 and the heat dissipation fin 7 to reduce the efficiency of heat transfer to the heat dissipation fin. At this time, the material conveying pipe 3 at the top of the quick-change nozzle 2 can pass through the circular hole in the middle of the heating block 1 and be inserted into the circular hole in the middle of the heat dissipation fin 7, and finally the quick-change nozzle 2 is screwed at the bottom of the heating block 1 to complete the assembly. When the quick-change nozzle 2 needs to be replaced later, it can be replaced by simply unscrewing it.

[0043] In the embodiments of the present disclosure, as shown in Figure 4 , the heating block 1 comprises:

[0044] The heating block 1 is provided with a quick-change nozzle 2 at the bottom, the heating block 1 is used for mounting and fixing the quick-change nozzle 2, and the quick-change nozzle 2 is used for extruding 3D printing material; the quick-change nozzle 2 is provided with a material conveying pipe 3 at the top, the material conveying pipe 3 is used for conveying the 3D printing material downward into the quick-change nozzle 2; the heating block 1 is provided with a connecting plate 4 at the top through a fixing screw 5, the connecting plate 4 is used for connecting the heating block 1 with the heat dissipation fins 7; and the connecting plate 4 is provided with a group of heat dissipation fins 7 at the top through the fixing screw 5, the fixing screw 5 is used for fastening the connecting plate 4 and the heat dissipation fins 7, and the heat dissipation fins 7 are used for dissipating the excess heat outward.

[0045] In the embodiment of the present disclosure, as shown in Figure 4 , one side of the heating block 1 is provided with a rectangular inner groove, and the heating block 1 can also rely on the rectangular inner groove on one side to cooperate with other heating and temperature measuring components to achieve the heating effect during installation.

[0046] The working principle of the embodiment is as follows: during assembly, the connecting plate 4 is first mounted on the top of the heating block 1 through the fixing screw 5, and then the heat dissipation fins 7 are mounted on the top of the connecting plate 4 through the fixing screw 5, at this time, the material conveying pipe 3 at the top of the quick-change nozzle 2 can pass through the circular hole in the middle of the heating block 1 and be inserted into the circular hole in the middle of the heat dissipation fins 7, and finally the quick-change nozzle 2 is screwed at the bottom of the heating block 1 through the threads to complete the assembly, when the quick-change nozzle 2 needs to be replaced later, it can be replaced only by being unscrewed, and the heating block 1 can also rely on the rectangular inner groove on one side to cooperate with other heating and temperature measuring components to achieve the heating effect during installation.

[0047] In the embodiment of the present disclosure, as shown in Figure 5 , the connecting plate 4 can also be a U-shaped plate, and the fixing screw 5 can pass through the circular holes on the vertical plates on the left and right sides and be screwed into the threaded holes on the heat dissipation fins 7, so that the fixing screw 5 does not need to be tightened at the bottom when the heat dissipation fins 7 are fixed, and it is more convenient and labor-saving to tighten the fixing screw 5 on the left and right sides.

[0048] The working principle of the embodiment is as follows: during assembly, the connecting plate 4 is first mounted on the top of the heating block 1 through the fixing screw 5, and then the heat dissipation fins 7 are mounted on the top of the connecting plate 4 through the fixing screw 5, at this time, the material conveying pipe 3 at the top of the quick-change nozzle 2 can pass through the circular hole in the middle of the heating block 1 and be inserted into the circular hole in the middle of the heat dissipation fins 7, and finally the quick-change nozzle 2 is screwed at the bottom of the heating block 1 through the threads to complete the assembly, when the quick-change nozzle 2 needs to be replaced later, it can be replaced only by being unscrewed, and the heating block 1 can also rely on the rectangular inner groove on one side to cooperate with other heating and temperature measuring components to achieve the heating effect during installation.

[0049] In the embodiment of the present disclosure, as shown in Figure 6 , the heating block 1 is provided with a quick-change nozzle 2 at the bottom, the heating block 1 is used for mounting and fixing the quick-change nozzle 2, and the quick-change nozzle 2 is used for extruding 3D printing material; the quick-change nozzle 2 is provided with a material conveying pipe 3 at the top, the material conveying pipe 3 is used for conveying the 3D printing material downward into the quick-change nozzle 2; the heating block 1 is provided with a connecting plate 4 at the top through a fixing screw 5, the connecting plate 4 is used for connecting the heating block 1 with the heat dissipation fins 7; and the connecting plate 4 is provided with a group of heat dissipation fins 7 at the top through the fixing screw 5, the fixing screw 5 is used for fastening the connecting plate 4 and the heat dissipation fins 7, and the heat dissipation fins 7 are used for dissipating the excess heat outward.

[0050] The bottom of the heating block 1 is provided with a quick-change nozzle 2, the heating block 1 is used for mounting and fixing the quick-change nozzle 2, and the quick-change nozzle 2 is used for extruding 3D printing material; the top of the quick-change nozzle 2 is provided with a material conveying pipe 3, the material conveying pipe 3 is used for conveying the 3D printing material downward into the quick-change nozzle 2; the top of the heating block 1 is provided with a group of heat dissipation fins 7 through fixing screws 5, the fixing screws 5 are used for fastening the heat dissipation fins 7, and the heat dissipation fins 7 are used for dissipating excess heat outward; the outside of the fixing screws 5 is further provided with isolation columns 6, and the isolation columns 6 can reduce the heat transfer efficiency to the heat dissipation fins.

[0051] In the embodiment of the present disclosure, as shown in Figure 6 The top of the heating block 1 is provided with a protruding plate on the left side and the right side, and a circular hole is arranged on the protruding plate, the fixing screw 5 can pass through the circular hole on the protruding plate on the left side and the right side of the top of the heating block 1 and be screwed into the threaded hole on the heat dissipation fin 7, and the assembly is time-saving and labor-saving.

[0052] The working principle of the embodiment is as follows: during assembly, the heat dissipation fin 7 can be mounted on the top of the heating block 1 through the fixing screw 5, the isolation column 6 is sleeved on the outside of the fixing screw 5 between the heating block 1 and the heat dissipation fin 7, the heat transfer efficiency to the heat dissipation fin is reduced, at this time, the material conveying pipe 3 at the top of the quick-change nozzle 2 can pass through the circular hole in the middle of the heating block 1 and be inserted into the circular hole in the middle of the heat dissipation fin 7, and finally the quick-change nozzle 2 can be screwed on the bottom of the heating block 1 through threads to complete the assembly, and when the quick-change nozzle 2 needs to be replaced later, it can be replaced only by being unscrewed.

[0053] Embodiment six, please refer to Figure 7 , comprising: a heating block 1;

[0054] The bottom of the heating block 1 is provided with a quick-change nozzle 2, the heating block 1 is used for mounting and fixing the quick-change nozzle 2, and the quick-change nozzle 2 is used for extruding 3D printing material; the top of the quick-change nozzle 2 is provided with a material conveying pipe 3, the material conveying pipe 3 is used for conveying the 3D printing material downward into the quick-change nozzle 2; the top of the heating block 1 is provided with a connecting plate 4 through fixing screws 5, the connecting plate 4 is used for connecting the heating block 1 and the heat dissipation fin 7; the top of the connecting plate 4 is provided with a group of heat dissipation fins 7 through fixing screws 5, the fixing screws 5 are used for fastening the connecting plate 4 and the heat dissipation fin 7, and the heat dissipation fin 7 is used for dissipating excess heat outward; the outside of the fixing screws 5 is further provided with isolation columns 6, and the isolation columns 6 can reduce the heat transfer efficiency to the heat dissipation fin.

[0055] In the embodiment of the present disclosure, as shown in Figure 7 The bottom of the heat dissipation fin 7 is provided with an opening slot penetrating front and back, and the opening slot at the bottom of the heat dissipation fin 7 can increase the contact area with the outside air, thereby improving the heat dissipation effect.

[0056] The working principle of the embodiment is as follows: when assembling, the connecting plate 4 is first installed on the top of the heating block 1 through the fixing screw 5, then the heat dissipation fins 7 are installed on the top of the connecting plate 4 through the fixing screw 5, the isolation column 6 is sleeved on the outside of the fixing screw 5 between the connecting plate 4 and the heat dissipation fins 7, the efficiency of heat transfer to the heat dissipation fins is reduced, at this time the material conveying pipe 3 at the top of the quick-change nozzle 2 can pass through the circular hole in the middle of the heating block 1 and be inserted into the circular hole in the middle of the heat dissipation fins 7, and finally the quick-change nozzle 2 is screwed at the bottom of the heating block 1 to complete the assembly, when the quick-change nozzle 2 needs to be replaced later, it can be replaced only by being unscrewed.

[0057] Embodiment seven, please refer to Figure 8 , comprising: a heating block 1;

[0058] A quick-change nozzle 2 is installed at the bottom of the heating block 1, the heating block 1 is used for installing and fixing the quick-change nozzle 2, and the quick-change nozzle 2 is used for extruding 3D printing material; a material conveying pipe 3 is arranged at the top of the quick-change nozzle 2, the material conveying pipe 3 is used for conveying 3D printing material downward into the quick-change nozzle 2; a connecting plate 4 is installed on the top of the heating block 1 through a fixing screw 5, the connecting plate 4 is used for connecting the heating block 1 and the heat dissipation fins 7; a group of heat dissipation fins 7 are installed on the top of the connecting plate 4 through the fixing screw 5, the fixing screw 5 is used for fastening the connecting plate 4 and the heat dissipation fins 7, and the heat dissipation fins 7 are used for dissipating excess heat outward.

[0059] In the embodiment of the present disclosure, as shown in Figure 8 , a frame is installed on the outside of the heat dissipation fins 7, and the heat dissipation fins 7 are fastened to the inside of the frame through the top wire 9 at the bottom of the frame, the frame on the outside of the heat dissipation fins 7 can protect the fins on the heat dissipation fins 7 and improve the overall strength of the structure, when assembling, the heat dissipation fins 7 are first installed on the inside of the frame, and then the top wire 9 is screwed into the threaded hole at the bottom of the frame, when the top end of the top wire 11 is in close contact with the bottom surface of the heat dissipation fins 7, the heat dissipation fins 7 can be tightly fixed.

[0060] The working principle of the embodiment is as follows: when assembling, the connecting plate 4 is first installed on the top of the heating block 1 through the fixing screw 5, then the heat dissipation fins 7 are installed on the top of the connecting plate 4 through the fixing screw 5, at this time the material conveying pipe 3 at the top of the quick-change nozzle 2 can pass through the circular hole in the middle of the heating block 1 and be inserted into the circular hole in the middle of the heat dissipation fins 7, and finally the quick-change nozzle 2 is screwed at the bottom of the heating block 1 to complete the assembly, when the quick-change nozzle 2 needs to be replaced later, it can be replaced only by being unscrewed.

[0061] Embodiment eight, please refer to Figure 9 , comprising: a heating block 1;

[0062] The bottom of the heating block 1 is provided with a quick-change nozzle 2, the heating block 1 is used for mounting and fixing the quick-change nozzle 2, and the quick-change nozzle 2 is used for extruding 3D printing material; the top of the quick-change nozzle 2 is provided with a material conveying pipe 3, the material conveying pipe 3 is used for conveying the 3D printing material downward into the quick-change nozzle 2; the top of the heating block 1 is provided with a group of heat dissipation fins 7 through fixing screws 5, the fixing screws 5 are used for fastening the heat dissipation fins 7, and the heat dissipation fins 7 are used for dissipating excess heat outward; the outside of the fixing screws 5 is further provided with isolation columns 6, and the isolation columns 6 can reduce the heat transfer efficiency of the heat dissipation fins.

[0063] In the embodiments of the present disclosure, as shown in Figure 9 The top and the left and right sides of the heating block 1 are provided with two horizontal threaded holes, and the fixing screws 5 can pass through the round holes on the outer frame of the heat dissipation fins 7 and be screwed into the threaded holes on the top and the left and right sides of the heating block 1, which is more convenient and labor-saving during assembly.

[0064] The working principle of the present embodiment is as follows: during assembly, the heat dissipation fins 7 can be installed on the top of the heating block 1 through the fixing screws 5, the isolation columns 6 are sleeved on the outside of the fixing screws 5 between the heating block 1 and the heat dissipation fins 7 to reduce the heat transfer efficiency of the heat dissipation fins, at this time, the material conveying pipe 3 at the top of the quick-change nozzle 2 can pass through the round hole in the middle of the heating block 1 and be inserted into the round hole in the middle of the heat dissipation fins 7, and finally the quick-change nozzle 2 can be screwed at the bottom of the heating block 1 to complete the assembly, when the quick-change nozzle 2 needs to be replaced later, it can be replaced only by being unscrewed.

[0065] In this paper, the following points need attention:

[0066] 1. The drawings of the embodiments of the present disclosure only relate to the structures involved in the embodiments of the present disclosure, and other structures can refer to the general design.

[0067] 2. In the case of no conflict, the embodiments of the present disclosure and the features in the embodiments can be combined to obtain new embodiments.

[0068] The above is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present disclosure, which should be covered in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A rigidly connected quick-change nozzle device, comprising: Heating block (1); characterized in that: The bottom of the heating block (1) is provided with a quick-change nozzle (2); the top of the quick-change nozzle (2) is provided with a material conveying pipe (3); the top of the heating block (1) is provided with a group of heat dissipation fins (7); the heating block (1) and the heat dissipation fins (7) are also provided with fixing screws (5).

2. The rigidly connected quick-change nozzle device according to claim 1, wherein The main body of the quick-change nozzle (2) is hexagonal, and the top of the quick-change nozzle (2) is provided with threads matched with the threaded holes in the bottom of the heating block (1), and the pitch of the threads of the main body of the quick-change nozzle (2) is at least twice.

3. The rigidly connected quick-change nozzle device according to claim 1, wherein The outer surface of the upper end of the quick-change nozzle (2) is smooth, and the outer diameter is slightly smaller than the diameter of the inner hole of the heating block (1), and the outer diameter of the material conveying pipe (3) is also slightly smaller than the inner diameter of the central hole of the heat dissipation fin (7).

4. The rigidly connected quick-change nozzle device according to claim 1, wherein One side of the heating block (1) can be provided with a vertical plane.

5. The rigidly connected quick-change nozzle device according to claim 1, wherein The top of the heating block (1) can be provided with a connecting plate (4), which can also be a U-shaped plate, and the fixing screws (5) can pass through the round holes in the vertical plates on the left and right sides of the connecting plate (4) and be screwed into the threaded holes in the heat dissipation fins (7).

6. The rigidly connected quick-change nozzle device according to claim 1, wherein The top of the heating block (1) can be provided with a protruding plate on the left and right sides, and a round hole is provided in the protruding plate, and the fixing screws (5) can pass through the round holes in the protruding plates on the left and right sides of the top of the heating block (1) and be screwed into the threaded holes in the heat dissipation fins (7).

7. The rigidly connected quick-change nozzle device according to claim 1, wherein The bottom of the heat dissipation fin (7) is provided with an opening slot penetrating from front to back.

8. The rigidly connected quick-change nozzle device according to claim 1, wherein The heat dissipation fin (7) is provided with a frame on the outside, and the heat dissipation fin (7) is fastened to the inside of the frame through the top screws at the bottom of the frame.

9. The rigidly connected quick-change nozzle device according to claim 1, wherein The top of the heating block (1) is provided with two horizontal threaded holes on the left and right sides, and the fixing screws (5) can pass through the round holes in the frame on the outside of the heat dissipation fin (7) and be screwed into the threaded holes on the left and right sides of the top of the heating block (1).

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