Particle 3D printer nozzle

Abstract

A particle 3D printer nozzle relates to the technical field of 3D printers and comprises a screw extrusion mechanism driven by a motor, a mounting frame and a feeding bin. A mounting frame is mounted outside the spiral extrusion mechanism, and a feeding bin correspondingly communicated with the feeding end of the spiral extrusion mechanism is mounted at the position, corresponding to the feeding end of the spiral extrusion mechanism, of the mounting frame; a pipe body, corresponding to the feeding end, of the spiral extrusion mechanism is sleeved with a heat dissipation block, and a pipe body at the other end is sleeved with a plurality of annular electric heaters; a heat dissipation device is mounted at the extrusion end, corresponding to the spiral extrusion mechanism, of the mounting frame; according to the utility model, the plurality of annular electric heaters can pre-heat granules at a low temperature and then heat the granules, and finally the granules are extruded after reaching an ideal molten state, so that the printing speed can be effectively improved; the heat dissipation device can effectively guarantee the heat dissipation effect on the nozzle and the printing model, the temperature of the nozzle is kept constant, it is guaranteed that the printed model can dissipate heat in time, and the good printing effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printers, in particular to a nozzle for a pellet 3D printer. Background Technique

[0002] At present, the FGF 3D printers on the market generally have problems such as insufficient extrusion volume and uneven material discharge, resulting in low printing speed and poor printing results; the melt structure has high requirements for processing pellets into a molten state, and the length and temperature of the tube shell of the screw extrusion mechanism need to be properly matched to achieve an ideal molten state; secondly, the nozzle stability of the screw extrusion mechanism is required to be higher, basically stable at about 280 °C, and a continuous high-speed air flow is required at the nozzle to rapidly cool the model material to form, avoiding situations such as collapse or wire drawing due to insufficient cooling of the model.

[0003] Chinese Patent (Publication No.: CN221112877U) discloses a new type of 3D printer pellet extruder and hot end; the patent includes a housing, on which a material tank and a throat pipe communicating with the inner cavity are provided, one end of the throat pipe communicates with the inner cavity, the other end of the throat pipe is connected to the hot end of the 3D printer, a screw rod is provided in the inner cavity, and a driving device is connected to the first end of the screw rod; when in use, it is found that the heating block of this patent only wraps around the outer sides of part of the pipe sections of the nozzle and the throat pipe, and cannot achieve a good matching effect of the length and temperature of the throat pipe, resulting in low printing speed and poor printing results; in addition, although this patent is provided with two sets of heat dissipation modules, the two sets of heat dissipation modules are of an open structure, and there is a large loss of the heat dissipation air flow during the process of blowing towards the nozzle and the printed model, resulting in poor heat dissipation effect. Summary of the Utility Model

[0004] In order to overcome the deficiencies in the background technique, the utility model discloses a nozzle for a pellet 3D printer.

[0005] To achieve the above-mentioned invention purpose, the utility model adopts the following technical solutions:

[0006] A nozzle for a pellet 3D printer includes a screw extrusion mechanism driven by a motor, and also includes a mounting frame and a feed bin; the mounting frame is installed outside the screw extrusion mechanism, and a feed bin corresponding to and communicating with the feed end of the screw extrusion mechanism is installed at the position of the mounting frame corresponding to the feed end of the screw extrusion mechanism; a heat dissipation block is sleeved on the tube body of the screw extrusion mechanism corresponding to its feed end, and a plurality of annular electric heaters are sleeved on the tube body at the other end; a heat dissipation device is installed on the mounting frame corresponding to the extrusion end of the screw extrusion mechanism.

[0007] Preferably, the heat dissipation device includes a wind guide cover covering the extrusion end of the screw extrusion mechanism, a wind guide cavity for making the heat dissipation air flow blow towards the extrusion end of the screw extrusion mechanism is arranged in the wind guide cover, and first heat dissipation fans with air outlets corresponding to and communicating with the wind guide cavity are installed on both sides of the mounting frame.

[0008] Preferably, a wind guiding plate for enabling the heat dissipation air flow to circulate circumferentially and spirally along the extrusion end of the screw extrusion mechanism is arranged in the air guiding cavity of the air guiding cover.

[0009] Preferably, the air guiding cavity of the air guiding cover is of a conical structure.

[0010] Preferably, second heat dissipation fans are installed on both sides of the mounting frame corresponding to the heat dissipation block.

[0011] Preferably, a discharge valve for emptying the feed bin is arranged at the position where the feed bin communicates with the feed end of the screw extrusion mechanism.

[0012] Preferably, a heat insulation ring is sleeved on the pipe body of the screw extrusion mechanism corresponding to the position between the heat dissipation block and the annular electric heater.

[0013] Due to the adoption of the above-mentioned technical solution, the utility model has the following beneficial effects:

[0014] A nozzle of a pellet 3D printer disclosed by the utility model has a simple structure, is easy to assemble, and has a relatively low production cost; a heat dissipation block is sleeved on the pipe body of the screw extrusion mechanism corresponding to its feed end, and a plurality of annular electric heaters are sleeved on the pipe body at the other end; the heat dissipation block is used for dissipating heat from the feed end of the screw extrusion mechanism to prevent the pellets just entering the screw extrusion mechanism from melting prematurely and causing sticking; the powers of the plurality of annular electric heaters increase sequentially from the feed end to the extrusion end of the screw extrusion mechanism, so that the pellets in the screw extrusion mechanism can be preheated at a low temperature first during the process of being pushed and extruded, then heated and raised in temperature, and finally extruded after reaching an ideal molten state, which can effectively improve the printing speed;

[0015] The heat dissipation device includes an air guiding cover sleeved on the extrusion end of the screw extrusion mechanism. The air guiding cavity of the air guiding cover is of a conical structure. The air guiding cover has a good guiding and wind gathering effect, so that the heat dissipation air flow can wrap the nozzle of the screw extrusion mechanism 360°, and the pressure is increased, which can effectively ensure the heat dissipation effect on the nozzle and the printed model, keep the temperature of the nozzle constant, and ensure that the printed model can be cooled in time to achieve a better printing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional structural schematic diagram of the utility model;

[0017] Figure 2 is a structural schematic diagram of the utility model;

[0018] Figure 3 is a structural schematic diagram of the air guiding cover.

[0019] In the figure: 1. Motor; 2. Screw extrusion mechanism; 3. Mounting frame; 4. Feed bin; 5. Heat dissipation block; 6. Ring-shaped electric heater; 7. Heat insulation ring; 8. Heat dissipation device; 8-1. Air guide cover; 8-2. First heat dissipation fan; 8-3. Air guide plate; 9. Second heat dissipation fan; 10. Discharge valve. Detailed implementation mode

[0020] The present utility model can be explained in detail through the following embodiments. The purpose of disclosing the present utility model is to protect all technical improvements within the scope of the present utility model. In the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right", etc. indicating the orientation or position relationship, it is only corresponding to the drawings of the present application for the convenience of describing the present utility model, rather than indicating or implying that the device or element referred to must have a specific orientation.

[0021] Example 1, in combination with the attached Figures 1-2 , A nozzle for a pellet 3D printer, comprising a screw extrusion mechanism 2 driven by a motor 1. The existing screw extrusion mechanism includes a casing, a screw for pushing the pellets to be extruded is installed inside the casing, a feed port is provided at one end of the casing, and a motor 1 for driving the screw is installed at this end of the casing. The other end of the casing is an extrusion end, and a nozzle is installed at the extrusion end. After the pellets are melted, they are extruded from the nozzle;

[0022] It also includes a mounting frame 3 and a feed bin 4; The mounting frame 3 is installed outside the screw extrusion mechanism 2. The mounting frame 3 is installed with a feed bin 4 corresponding to and communicating with the feed end of the screw extrusion mechanism 2 at the position corresponding to the feed end of the screw extrusion mechanism 2. During 3D printing, the feed bin 4 can be correspondingly communicated with the feeding device, and the pellets are temporarily stored in the feed bin 4 to ensure that the pellets can be stably replenished into the screw extrusion mechanism 2 during the printing process, preventing problems such as unstable feeding or accidental material breakage;

[0023] A heat dissipation block 5 is sleeved on the tube body corresponding to the feed end of the screw extrusion mechanism 2, and a plurality of ring-shaped electric heaters 6 are sleeved on the tube body at the other end. The ring-shaped electric heater 6 is a mature existing component, so its structure and working principle will not be elaborated; The heat dissipation block 5 is used to dissipate heat from the feed end of the screw extrusion mechanism 2 to prevent the pellets just entering the screw extrusion mechanism 2 from melting prematurely and causing sticking; The mounting frame 3 is installed with second heat dissipation fans 9 on both sides corresponding to the heat dissipation block 5, which can effectively ensure the heat dissipation effect; An insulation ring 7 is sleeved on the tube body of the screw extrusion mechanism 2 corresponding to the position between the heat dissipation block 5 and the ring-shaped electric heater 6, which can prevent the ring-shaped electric heater 6 from directly transferring heat to the heat dissipation block 5;

[0024] The power of multiple annular electric heaters 6 increases sequentially from the feeding end to the extrusion end of the screw extrusion mechanism 2, so that the granular material in the screw extrusion mechanism 2 can be preheated at a low temperature first during the process of being pushed and extruded, then heated up, and finally extruded after reaching an ideal molten state, which can effectively improve the printing speed; a heat dissipation device 8 is installed on the mounting frame 3 corresponding to the extrusion end of the screw extrusion mechanism 2, and the heat dissipation device 8 can blow a continuous heat dissipation air flow to the extrusion end of the screw extrusion mechanism 2, so that the extrusion end of the screw extrusion mechanism 2 maintains a constant temperature. At the same time, the continuous downward flow of the heat dissipation air flow can quickly cool and form the printed model material, avoiding situations such as the collapse or wire drawing of the model due to insufficient cooling.

[0025] Embodiment 2, in combination with the attached Figures 1-3 , a nozzle for a granular material 3D printer, different from Embodiment 1 in that on the basis of Embodiment 1, the heat dissipation device 8 includes a wind guide cover 8-1 covering the extrusion end of the screw extrusion mechanism 2. A wind guide cavity for making the heat dissipation air flow blow towards the extrusion end of the screw extrusion mechanism 2 is provided in the wind guide cover 8-1. First heat dissipation fans 8-2 with air outlets corresponding to and communicating with the wind guide cavity are installed on both sides of the mounting frame 3, that is, the heat dissipation air flows blown by the two first heat dissipation fans 8-2 can blow towards the nozzle of the screw extrusion mechanism 2 along the wind guide cavity in the wind guide cover 8-1 and continue to flow downward to conduct air-cooled heat dissipation on the printed model; the wind guide cavity of the wind guide cover 8-1 is of a conical structure, and the wind guide cover 8-1 has a good guiding and wind gathering effect, so that the heat dissipation air flow can wrap the nozzle of the screw extrusion mechanism 2 360° and increase the pressure, which can effectively ensure the heat dissipation effect on the nozzle and the printed model, keep the temperature of the nozzle constant, and ensure that the printed model can be timely dissipated of heat, achieving a better printing effect;

[0026] A wind guide plate 8-3 for making the heat dissipation air flow flow in a circumferential spiral manner along the extrusion end of the screw extrusion mechanism 2 is provided in the wind guide cavity of the wind guide cover 8-1, which can make the heat dissipation air flow form a spiral wind and further enhance the heat dissipation effect on the nozzle and the printed model.

[0027] Embodiment 3, in combination with the attached Figure 1 , a nozzle for a granular material 3D printer, on the basis of Embodiment 1 or 2, a discharge valve 10 for emptying the feed bin 4 is provided at the position where the feed bin 4 corresponds to and communicates with the feeding end of the screw extrusion mechanism 2, that is, when the machine stops for a long time or when the granular material needs to be replaced, the discharge valve 10 can be opened to empty the granular material in the feed bin 4.

[0028] The parts not described in detail in this utility model are prior art. For those skilled in the art, it is obvious that this utility model is not limited to the details of the above-described exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive, aiming to encompass all changes falling within the meaning and scope of equivalent elements within this utility model.

Claims

1. A granular material 3D printer nozzle, comprising a spiral extrusion mechanism (2) driven by a motor (1), characterized in that: It also comprises a mounting frame (3) and a feed bin (4); the mounting frame (3) is mounted outside the spiral extrusion mechanism (2); the feeding end of the spiral extrusion mechanism (2) and the corresponding feeding bin (4) connected thereto are mounted on the mounting frame (3) at a position corresponding to the feeding end of the spiral extrusion mechanism (2); a heat sink (5) is provided on the tube body of the spiral extrusion mechanism (2) corresponding to its feeding end, and a plurality of annular electric heaters (6) are provided on the tube body at the other end, the power of the plurality of annular electric heaters (6) increasing in sequence from the feeding end to the extrusion end of the spiral extrusion mechanism (2); and a heat sink (8) is provided on the mounting frame (3) corresponding to the extrusion end of the spiral extrusion mechanism (2).

2. The granular material 3D printer nozzle according to claim 1, characterized in that: The heat dissipation device (8) comprises an air guide cover (8-1) arranged at the extrusion end of the spiral extrusion mechanism (2), the air guide cover (8-1) being provided with an air guide cavity for blowing heat dissipation airflow toward the extrusion end of the spiral extrusion mechanism (2), and first heat dissipation fans (8-2) having air outlets correspondingly connected to the air guide cavity are installed on both sides of the mounting frame (3).

3. The granular material 3D printer nozzle as claimed in claim 2, characterized in that: An air guide plate (8-3) is provided in the air guide cavity of the air guide cover (8-1) for allowing the heat dissipating airflow to flow in a circular spiral along the extrusion end of the spiral extrusion mechanism (2).

4. The granular material 3D printer nozzle as claimed in claim 2 or 3, characterized in that: The air guide cavity of the air guide cover (8-1) has a conical structure.

5. The granular material 3D printer nozzle according to claim 1, characterized in that: Second cooling fans (9) are installed on both sides of the mounting frame (3) corresponding to the cooling block (5).

6. The granular material 3D printer nozzle according to claim 1, characterized in that: A discharge valve (10) for emptying the feed bin (4) is provided at a position corresponding to the communication between the feed bin (4) and the feed end of the spiral extrusion mechanism (2).

7. The granular material 3D printer nozzle according to claim 1, characterized in that: The spiral extrusion mechanism (2) is provided with a heat insulating ring (7) on the tube body between the corresponding heat dissipation block (5) and the annular electric heater (6).

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