3D printing material conveying and spraying device for automobile hand plate

Abstract

The utility model discloses a car hand plate spare 3D printing feed injection device, including conveying storehouse, the feed pipe department of conveying storehouse is equipped with the feeding bin, and the inside installation of feeding bin has the inner bush, and the lower extreme of conveying storehouse is installed with the shower nozzle, still including replacement mechanism, replacement mechanism: it includes sliding slot, guide slot, limit slot, mounting panel, insert block and slot, the inner arc surface right -hand member of sliding slot is opened in the feeding bin, and the inner arc surface rear side of sliding slot is equipped with the guide slot, the right side arc surface of mounting panel is equipped with the limit board of symmetrical distribution, and limit board all uses with guide slot cooperation, and the inner arc surface front side of sliding slot is equipped with the limit slot of symmetrical distribution, this car hand plate spare 3D printing feed injection device, through the sliding cooperation of sliding slot, guide slot and limit board and the quick butt joint of insert block and slot, need not rely on a large number of screw dismounting and additional tool, can complete the quick replacement of feeding bin inner lining part, and the operation step is greatly simplified, and the replacement time is shortened.

Description

Technical Field

[0001] This utility model relates to the field of automotive prototype parts processing technology, specifically to an automotive prototype parts 3D printing material feeding and jetting device. Background Technology

[0002] As the automotive industry shifts towards personalized design and rapid R&D, the cycle from concept design to mass production verification for new models is constantly shortening. As the core carrier for design visualization and functional testing, the processing efficiency and accuracy of automotive prototypes directly affect the R&D progress. Due to its advantages of rapid prototyping and strong adaptability to complex structures, 3D printing technology has become one of the mainstream technologies for processing automotive prototypes. The material feeding and jetting device, as the "core execution unit" of 3D printing equipment, is responsible for conveying and melting printing materials (such as ABS, nylon, etc.) from a solid state to a stable fluid state and accurately jetting them onto the printing platform. Its performance stability is crucial to the surface quality, dimensional accuracy, and processing continuity of automotive prototypes. It is currently widely used in rapid prototyping scenarios for automotive exterior parts, structural parts, and other prototypes.

[0003] Existing 3D printing feed and jetting devices for automotive prototype parts typically consist of a feed bin, a conveyor bin, a melting mechanism, a nozzle, and a drive unit. During operation, solid printing material is first fed into the feed bin and guided into the conveyor bin. Inside the conveyor bin, a spiral drive unit rotates under the drive of a motor, continuously pushing the material downwards. Simultaneously, a built-in heating element in the conveyor bin heats the material, gradually melting it from a solid state into a uniformly flowing molten material. Under the pressure of the spiral drive unit, the molten material is conveyed to the nozzle at the lower end of the conveyor bin. After secondary temperature calibration of the molten material by the built-in heating element, the nozzle sprays the molten material in a linear or droplet-like manner onto the printing platform. Following the platform's movement trajectory, the material accumulates layer by layer to form the pre-set automotive prototype part. In addition, some devices are equipped with basic temperature monitoring components to initially monitor the temperature of the conveyor bin or nozzle, ensuring that the molten material meets basic printing requirements.

[0004] In practical applications, there is still room for improvement in existing material feeding and jetting devices: the inner lining components that come into direct contact with the raw materials in the feeding bin (used to reduce wear on the feeding bin body) need to be replaced regularly due to long-term friction from the raw materials. However, existing inner lining components are mostly fixed to the feeding bin with multiple sets of screws. When replacing them, multiple fasteners need to be disassembled and special tools are required, making the operation cumbersome and the replacement time-consuming. Therefore, we propose a 3D printing material feeding and jetting device for automotive prototype parts. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the existing defects and provide a material feeding and jetting device for 3D printing automotive prototype parts. Through the sliding cooperation of the chute, guide groove and limiting plate and the quick docking of the insert and slot, the problems in the background art can be effectively solved.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a 3D printing material feeding and jetting device for automotive prototype parts, including a conveying chamber, a feeding hopper at the feed pipe of the conveying chamber, an inner liner installed inside the feeding hopper, a nozzle installed at the lower end of the conveying chamber, and a replacement mechanism.

[0007] Replacement mechanism: It includes a slide, a guide groove, a limiting groove, a mounting plate, inserts, and slots. The slide is located at the right end of the inner arc surface of the feeding bin. A guide groove is located on the rear side of the inner arc surface of the slide. The right arc surface of the mounting plate has symmetrically distributed limiting plates, which cooperate with the guide grooves. The front side of the inner arc surface of the slide has symmetrically distributed limiting grooves, and the limiting plates are located inside the adjacent limiting grooves on the right. The right end of the outer arc surface of the inner liner has symmetrically distributed slots. The left side of the mounting plate is equipped with symmetrically distributed inserts, which are inserted into the adjacent slots on the left. Through the sliding cooperation of the slide, guide groove, and limiting plates, and the quick docking of the inserts and slots, the inner liner components of the feeding bin can be quickly replaced without relying on a large number of screws and additional tools, greatly simplifying the operation steps and shortening the replacement time.

[0008] Furthermore, the replacement mechanism also includes a cover plate and a limiting block. The cover plate is located at the upper end of the feeding hopper, and a limiting block is installed on the lower right side of the cover plate. The limiting block is used in conjunction with the slide groove and the guide groove to limit the mounting plate and the limiting plate for secondary positioning.

[0009] Furthermore, the replacement mechanism also includes insertion holes, which are evenly distributed on the upper side of the conveying chamber. The lower side of the cover plate is fixedly connected with evenly distributed insertion posts, which are all inserted into the adjacent insertion holes on the lower side to facilitate the fixation of the cover plate.

[0010] Furthermore, a ceramic sealing gasket is fixedly connected to the bottom wall of the feeding hopper, and the upper side of the ceramic sealing gasket contacts the lower side of the inner liner to achieve a seal.

[0011] Furthermore, a rotating shaft is rotatably connected to the top wall of the conveying chamber. The outer arc surface of the rotating shaft is provided with helical blades, and the edge of the helical blades fits against the inner arc surface of the conveying chamber. A motor is installed on the upper side of the conveying chamber. The output shaft of the motor is fixedly connected to the center of the upper end face of the rotating shaft. The input end of the motor is electrically connected to the output end of an external controller for stable driving.

[0012] Furthermore, an infrared temperature sensor is installed on the lower side of the conveying chamber. The infrared temperature sensor is used in conjunction with the nozzle and is bidirectionally electrically connected to an external microcontroller for temperature detection.

[0013] Furthermore, a temperature sensor is installed at the lower rear end of the conveying chamber. The temperature probe of the temperature sensor extends into the lower interior of the conveying chamber. The temperature sensor is bidirectionally electrically connected to an external microcontroller for temperature detection.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This 3D printing material feeding and jetting device for automotive prototype parts has the following advantages:

[0015] When replacing the inner liner, there is no need to rely on a large number of screws for disassembly and assembly. Through the sliding cooperation of the slide groove, guide groove and limit plate, combined with the quick docking of the insert and slot, the mounting plate is rotated to drive the limit plate from the limit groove into the guide groove. Then, the mounting plate is pulled to simultaneously take out the inner liner. When replacing the new inner liner, the operation is reversed. After inserting the insert into the slot of the new inner liner, it is placed into the feeding hopper along the guide groove. After rotating to complete the limit, the liner is fixed. The entire operation is simple and does not require additional tools, which greatly shortens the replacement time of the inner liner and significantly improves the convenience and efficiency of equipment maintenance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a partial cross-sectional view of the rear side of the present invention.

[0018] Figure 3 This is a schematic diagram of a partial explosion of the feeding bin and inner liner of this utility model;

[0019] Figure 4 This is a structural schematic diagram of the rear cross-section of the feeding bin of this utility model;

[0020] Figure 5 This is an enlarged structural schematic diagram of point A of this utility model;

[0021] Figure 6 This is a partial structural diagram of the feeding bin of this utility model;

[0022] Figure 7 This is a schematic diagram of the upper plane of the feeding bin of this utility model;

[0023] Figure 8 This is an enlarged structural schematic diagram of section B of this utility model.

[0024] In the diagram: 1. Feeding bin, 2. Changing mechanism, 21. Slide, 22. Guide groove, 23. Limiting groove, 24. Mounting plate, 241. Limiting plate, 25. Insertion block, 26. Slot, 27. Cover plate, 271. Insertion post, 28. Insertion hole, 29. Limiting block, 3. Inner liner, 4. Conveying bin, 5. Rotating shaft, 6. Nozzle, 7. Motor, 8. Temperature sensor, 9. Infrared temperature sensor, 10. Ceramic sealing gasket. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1-8This embodiment provides a technical solution: a 3D printing material feeding and jetting device for automotive prototype parts, including a conveying chamber 4. A rotating shaft 5 is rotatably connected to the top wall of the conveying chamber 4. The outer arc surface of the rotating shaft 5 is provided with helical blades, the edges of which are in contact with the inner arc surface of the conveying chamber 4. A nickel-chromium heating wire is embedded inside the cylinder wall of the conveying chamber 4. The input end of the nickel-chromium heating wire is electrically connected to the output end of an external microcontroller. A motor 7 is mounted on the upper side of the conveying chamber 4. The output shaft of the motor 7 is fixedly connected to the center of the upper end face of the rotating shaft 5. The input end of the motor 7 is electrically connected to an external controller. At the output end, an infrared temperature sensor 9 is installed on the lower side of the conveying chamber 4. The infrared temperature sensor 9 works in conjunction with the nozzle 6 and is bidirectionally electrically connected to an external microcontroller. A temperature sensor 8 is installed at the lower rear end of the conveying chamber 4. The temperature probe of the temperature sensor 8 extends into the lower interior of the conveying chamber 4 and is bidirectionally electrically connected to an external microcontroller. A feeding chamber 1 is provided at the feed pipe of the conveying chamber 4. An inner liner 3 is installed inside the feeding chamber 1. A nozzle 6 is installed at the lower end of the conveying chamber 4 (the nozzle 6 is commonly used in automotive applications in the prior art). In 3D printing of prototype parts, the conventional nozzle 6 has an embedded heating wire (the input end of which is electrically connected to the output end of an external microcontroller). The conveying chamber 4 is the core unit for material melting and quantitative conveying. The rotating shaft 5, which is rotatably connected to its top wall, is a key actuator. During printing, the external controller sends a drive signal to the motor 7, and the output shaft of the motor 7 drives the rotating shaft 5 to rotate at high speed. When the rotating shaft 5 rotates, the spiral blades on its surface forcefully push the solid raw material falling into the feeding chamber 1 downwards. The conveying chamber 4 has an embedded nickel-chromium heating wire inside its cylinder wall. The external microcontroller... The temperature control signal is sent to the nickel-chromium heating wire based on the melting point of the printing material (e.g., ABS melting point is about 180-220℃, nylon melting point is about 220-260℃). The nickel-chromium heating wire is energized to generate heat and transfers the heat to the inside of the conveying chamber 4. During the process of the raw material being pushed by the spiral blades on the surface of the rotating shaft 5, it continuously absorbs the heat transferred from the conveying chamber 4 and gradually melts from a solid state to a fluid molten material. Finally, the uniformly molten material is pushed to the nozzle 6 interface at the lower end of the conveying chamber 4. The nozzle 6 is a special spraying structure adapted to automotive prototype parts (the outlet orifice diameter is usually 0.2-0.5mm (selected according to the details required for the prototype part), its internal channel is sealed and connected to the molten material outlet at the lower end of the conveying chamber 4. When the uniformly molten material enters the nozzle 6, under the continuous pressure generated by the spiral blades on the surface of the rotating shaft 5 inside the conveying chamber 4, it flows at a constant speed along the internal channel of the nozzle 6 to the outlet, and is finally sprayed into the designated position of the 3D printing platform in a "droplet" or "line" shape (in coordination with the XY axis movement of the printing platform). During this process, the probe of the temperature sensor 8 extends into the lower end of the conveying chamber 4 (near the nozzle 6 interface) to detect the temperature of the molten material before it enters the nozzle 6 in real time, and feeds the temperature data back to the external microcontroller. If the temperature is lower than the required melting temperature of the material (e.g., ABS below 180℃), the microcontroller controls the nickel-chromium heating wire inside the conveying chamber 4 to increase the power. If the temperature is too high (e.g., ABS above 230℃), the heating power is reduced to ensure that the temperature of the molten material is stable within ±2℃ before entering the nozzle 6. The infrared temperature sensor 9 is installed on the lower side of the conveying chamber, facing the outlet of the nozzle 6. It collects the spray temperature of the molten material at the outlet of the nozzle 6 in real time through non-contact infrared detection technology (the nozzle has an embedded heating wire that can provide secondary heating for the molten material). If a temperature fluctuation at the outlet is detected (e.g., a temperature drop of 5℃ due to ambient heat dissipation), the microcontroller immediately adjusts the power of the heating wire in the nozzle 6 to compensate for the temperature loss and avoid a reduction in spray volume due to a sudden increase in the viscosity of the molten material (error ≤ ±3%). This ensures uniform printing layer thickness for automotive prototype parts (e.g., layer thickness deviation ≤ 0.02mm for 0.3mm thin-walled structures). It also includes a replacement mechanism 2.

[0027] Replacement mechanism 2 includes a slide 21, a guide groove 22, a limiting groove 23, a mounting plate 24, an insert block 25, and a slot 26. The slide 21 is located at the right end of the inner arc surface of the feeding bin 1 (the central axis of the circle containing the slide 21 coincides with the central axis of the feeding bin 1). The guide groove 22 is located on the rear side of the inner arc surface of the slide 21. The right arc surface of the mounting plate 24 is provided with symmetrically distributed limiting plates 241 (the mounting plate 24 is an arc-shaped mounting plate; when the mounting plate 24 slides clockwise inside the slide 21, the central axis of the circle containing the mounting plate 24 coincides with the central axis of the circle containing the slide 21, that is, the mounting plate 24 rotates around the central axis of the circle containing the slide 21). The limiting plates 241 are all used in conjunction with the guide groove 22 (the outer arc surface of the limiting plate 241 coincides with the guide groove 25). The inner arc surface of the guide groove 22 slides (the central axis of the circle containing the guide groove 22 coincides with the central axis of the circle containing the slide groove 21). The inner arc surface of the slide groove 21 is provided with symmetrically distributed limiting grooves 23 (two limiting grooves 23 are arranged vertically and vertically, and the central axes of the circles containing the two limiting grooves 23 coincide with the central axis of the circle containing the slide groove 21). The limiting plates 241 are all located inside the adjacent limiting grooves 23 on the right side. The outer arc surface of the inner bushing 3 is provided with symmetrically distributed slots 26. The left side of the mounting plate 24 is provided with symmetrically distributed inserts 25, and the inserts 25 are all inserted into the adjacent slots 26 on the left side. The replacement mechanism 2 also includes a cover plate 27 and a limiting block 29. The cover plate 27 is located at the upper end of the feeding bin 1, and the lower right side of the cover plate 27 is provided with a limiting block 29 for limiting the movement of the feeder. Block 29 is used in conjunction with chute 21 and guide groove 22 respectively (the fan-shaped area formed between the rear end of guide groove 22 and chute 21 is the limiting area, the cross-section of limiting block 29 is the same as the cross-section of limiting area, when limiting block 29 is inserted into limiting area, it blocks the upper limiting groove 23, and the upper limiting plate 241 is not easy to move). The replacement mechanism 2 also includes insertion holes 28, which are evenly opened on the upper side of conveying bin 4. The lower side of cover plate 27 is fixedly connected with evenly distributed insertion posts 271, and the insertion posts 271 are all inserted into the adjacent insertion holes 28 on the lower side. The bottom wall of feeding bin 1 is fixedly connected with ceramic sealing gasket 10, and the upper side of ceramic sealing gasket 10 contacts the lower side of inner liner 3. Feeding bin 1 serves as a raw material storage and transition unit. The installed inner sleeve 3 (the inner sleeve 3 is a wear-resistant ceramic inner sleeve) is in direct contact with the solid raw material, avoiding wear on the feeding bin 1 body. Before printing, the 3D printing raw material (granules or powder) is poured into the feeding bin 1. The raw material slides down the inner wall of the inner sleeve 3 and falls naturally into the conveying bin 4 through the feed pipe interface between the feeding bin 1 and the conveying bin 4, completing the initial guidance of the raw material. When the inner sleeve 3 needs to be replaced due to long-term wear, first pull the cover plate 27 upwards, so that the insert 271 on the lower side of the cover plate 27 disengages from the insert hole 28 on the conveying bin. At the same time, the limiting block 29 at the end of the cover plate 27 exits the limiting area formed by the slide groove 21 and the guide groove 22 of the feeding bin 1. Then rotate the mounting plate 24, causing the limiting plate 241 on its right side to rotate out of the limiting groove 23 on the front side of the slide groove 21.Entering the interior of the guide groove 22, as the mounting plate 24 rotates, the inner bushing 3 rotates synchronously through the insertion and engagement of the insert 25 and the slot 26. Then, the worker pulls the mounting plate 24 upwards, causing it to slide upwards along the guide groove 22, carrying the inner bushing 3 away from the feeding hopper 1. Finally, the worker pulls the mounting plate 24 outwards, causing the insert 25 on the left side of the mounting plate 24 to disengage from the slot 26 on the outer arc surface of the inner bushing 3. A new inner bushing 3 is then taken, and the insert 25 on the left side of the mounting plate 24 is inserted into the slot 26 on the outer arc surface of the new inner bushing 3. The new inner bushing 3 is then placed inside the feeding hopper 1, causing the right side of the mounting plate 24 to... Position plate 241 enters the guide groove 22, pushing the inner bushing 3 downwards. When pushed to the end, the bottom of the inner bushing 3 is in contact with the ceramic sealing gasket 10 on the bottom wall of the feeding bin 1. Rotating the inner bushing 3 causes the mounting plate 24 to rotate synchronously, allowing the limiting plate 241 to slide into the limiting groove 23 to complete axial limiting. Finally, the cover plate 27 is placed on top, and the insert post 271 is inserted into the insertion hole 28 to fix the cover plate 27. The limiting block 29 is embedded in the limiting area between the sliding groove 21 and the guide groove 22, further limiting the displacement of the mounting plate 24 and ensuring the stability of the inner bushing 3 after installation. This disassembly and assembly process significantly reduces the use of screws.

[0028] The working principle of the 3D printing material feeding and jetting device for automotive prototype parts provided by this utility model is as follows: The feeding bin 1 serves as a raw material storage and transition unit. The inner liner 3 (the inner liner 3 is a wear-resistant ceramic inner liner) installed inside directly contacts the solid raw material, avoiding wear on the feeding bin 1 body. Before printing, the 3D printing raw material (granules or powder) is poured into the feeding bin 1. The raw material slides down the inner wall of the inner liner 3 and falls naturally into the conveying bin 4 through the feed pipe interface between the feeding bin 1 and the conveying bin 4, completing the initial guidance of the raw material. When the inner liner 3 needs to be replaced due to long-term wear, the cover plate 27 is pulled upward first, so that the insert 271 on the lower side of the cover plate 27 disengages from the insert hole 28 on the conveying bin. At the same time, the limiting block 29 at the end of the cover plate 27 exits the slide groove of the feeding bin 1. The mounting plate 24 is rotated, causing the limiting plate 241 on its right side to rotate out of the limiting groove 23 on the front side of the slide 21 and enter the interior of the guide groove 22. When the mounting plate 24 rotates, the inner bushing 3 rotates synchronously through the insertion and engagement of the insert 25 and the slot 26. Then, the worker pulls the mounting plate 24 upward to make it slide upward along the guide groove 22, taking the inner bushing 3 away from the feeding bin 1. Finally, the mounting plate 24 is pulled outward to make the insert 25 on the left side of the mounting plate 24 disengage from the slot 26 on the outer arc surface of the inner bushing 3. Then, a new inner bushing 3 is taken out, and the insert 25 on the left side of the mounting plate 24 is inserted into the slot 26 on the outer arc surface of the new inner bushing 3. The new inner bushing 3 is then placed into the interior of the feeding bin 1, so that the mounting plate 24 is rotated. The limiting plate 241 on the right side of plate 24 enters the interior of guide groove 22, pushing the inner bushing 3 downwards. When pushed to the end, the bottom of the inner bushing 3 fits against the ceramic sealing gasket 10 on the bottom wall of the feeding bin 1. Rotating the inner bushing 3 causes the mounting plate 24 to rotate synchronously, allowing the limiting plate 241 to slide into the limiting groove 23 to complete axial limiting. Finally, the cover plate 27 is covered, and the insert pin 271 is inserted into the insertion hole 28 to fix the cover plate 27. The limiting block 29 is embedded in the limiting area between the sliding groove 21 and guide groove 22, further limiting the displacement of the mounting plate 24 and ensuring the stability of the inner bushing 3 after installation. This disassembly and assembly process greatly reduces the use of screws. The conveying bin 4 is the core unit for material melting and quantitative conveying, and the rotating shaft 5 connected to its top wall is a key actuator. During printing, the external controller sends a drive signal to motor 7, which drives the rotating shaft 5 to rotate at high speed. As the rotating shaft 5 rotates, the spiral blades on its surface forcefully push the solid raw material falling into the feeding bin 1 downwards. The inner wall of the conveying bin 4 is embedded with a nickel-chromium heating wire. The external microcontroller sends a temperature control signal to the nickel-chromium heating wire based on the melting point of the printing material (e.g., ABS melting point is about 180-220℃, nylon melting point is about 220-260℃). The nickel-chromium heating wire is energized to generate heat and transfers the heat to the inside of the conveying bin 4. As the raw material is pushed by the spiral blades on the surface of the rotating shaft 5, it continuously absorbs the heat transferred from the conveying bin 4, gradually melting from a solid state into a fluid molten material. Finally, the uniformly molten material is pushed to the nozzle 6 interface at the lower end of the conveying bin 4.Nozzle 6 is a dedicated spraying structure adapted for automotive prototype parts (the outlet diameter is typically 0.2-0.5mm, selected according to the detailed requirements of the prototype part). Its internal channel is sealed and connected to the molten material outlet at the lower end of the conveying chamber 4. When the uniformly molten material enters nozzle 6, it is pushed by the spiral blades on the surface of the rotating shaft 5 inside the conveying chamber 4 under continuous pressure, flowing at a constant speed along the internal channel of nozzle 6 to the outlet, and finally sprayed into the designated position on the 3D printing platform in a "droplet" or "line" shape (in coordination with the XY axis movement of the printing platform). During this process, the probe of temperature sensor 8 extends into the lower end of the conveying chamber 4 (near the nozzle 6 interface) to detect the temperature of the molten material before it enters nozzle 6 in real time, and feeds the temperature data back to the external microcontroller. If the temperature is lower than the required melting temperature of the material (e.g., ABS below 180℃), the system will detect the molten material. The microcontroller controls the increased power of the nickel-chromium heating wire inside the conveying chamber 4. If the temperature is too high (e.g., above 230℃ for ABS), the heating power is reduced to ensure that the temperature of the molten material is stable within ±2℃ before entering the nozzle 6. An infrared temperature sensor 9 is installed on the lower side of the conveying chamber, directly opposite the nozzle 6 outlet. Using non-contact infrared detection technology, it collects the spray temperature of the molten material at the nozzle 6 outlet in real time (the nozzle has an embedded heating wire for secondary heating of the molten material). If a temperature fluctuation is detected at the outlet (e.g., a 5℃ drop due to ambient heat dissipation), the microcontroller immediately adjusts the power of the heating wire inside the nozzle 6 to compensate for the temperature loss and prevent a reduction in spray volume due to a sudden increase in molten material viscosity (error ≤ ±3%), ensuring uniform layer thickness for automotive prototype parts (e.g., layer thickness deviation ≤ 0.02mm for 0.3mm thin-walled structures).

[0029] It is worth noting that the motor 7 disclosed in the above embodiments can be a two-phase stepper motor of model 57HS22, the temperature sensor 8 can be a WZP-035PT100 platinum resistance sensor, the infrared temperature sensor 9 can be a model MLX90614ESF-DCI, the external microcontroller can be a model STM32F103C8T6, and the external controller is equipped with control buttons corresponding to the motor 7 for controlling its switching. The external microcontroller controls the temperature sensor 8, the infrared temperature sensor 9, the nichrome heating wire, and the operation of the heating wire using methods commonly used in the prior art.

[0030] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A 3D printing material feeding and jetting device for automotive prototype parts, comprising a conveying chamber (4), wherein a feeding chamber (1) is provided at the inlet pipe of the conveying chamber (4), an inner liner (3) is installed inside the feeding chamber (1), and a nozzle (6) is installed at the lower end of the conveying chamber (4), characterized in that: It also includes the replacement mechanism (2); Replacement mechanism (2): It includes a slide (21), a guide groove (22), a limiting groove (23), a mounting plate (24), a plug (25), and a slot (26). The slide (21) is opened at the right end of the inner arc surface of the feeding bin (1). The guide groove (22) is opened on the rear side of the inner arc surface of the slide (21). The right arc surface of the mounting plate (24) is provided with symmetrically distributed limiting plates (241). The limiting plates (241) are used in conjunction with the guide groove (22). The front side of the inner arc surface of the slide (21) is provided with symmetrically distributed limiting grooves (23). The limiting plates (241) are all located inside the adjacent limiting grooves (23) on the right side. The right end of the outer arc surface of the inner bushing (3) is provided with symmetrically distributed slots (26). The left side of the mounting plate (24) is equipped with symmetrically distributed plugs (25). The plugs (25) are all inserted into the adjacent slots (26) on the left side.

2. The 3D printing material feeding and jetting device for automotive prototype parts according to claim 1, characterized in that: The replacement mechanism (2) also includes a cover plate (27) and a limiting block (29). The cover plate (27) is located at the upper end of the feeding bin (1). The limiting block (29) is installed on the right side of the lower side of the cover plate (27). The limiting block (29) is used in conjunction with the slide groove (21) and the guide groove (22).

3. The 3D printing material feeding and jetting device for automotive prototype parts according to claim 2, characterized in that: The replacement mechanism (2) also includes insertion holes (28), which are evenly distributed on the upper side of the conveying chamber (4). The lower side of the cover plate (27) is fixedly connected with evenly distributed insertion posts (271), and the insertion posts (271) are all inserted into the adjacent insertion holes (28) on the lower side.

4. The 3D printing material feeding and jetting device for automotive prototype parts according to claim 1, characterized in that: The bottom wall of the feeding bin (1) is fixedly connected with a ceramic sealing gasket (10), and the upper side of the ceramic sealing gasket (10) contacts the lower side of the inner liner (3).

5. The 3D printing material feeding and jetting device for automotive prototype parts according to claim 1, characterized in that: The top wall of the conveying chamber (4) is rotatably connected to a rotating shaft (5). The outer arc surface of the rotating shaft (5) is provided with helical blades. The edge of the helical blades is in contact with the inner arc surface of the conveying chamber (4). A motor (7) is installed on the upper side of the conveying chamber (4). The output shaft of the motor (7) is fixedly connected to the center of the upper end face of the rotating shaft (5). The input end of the motor (7) is electrically connected to the output end of an external controller.

6. The 3D printing material feeding and jetting device for automotive prototype parts according to claim 1, characterized in that: An infrared temperature sensor (9) is installed on the lower side of the conveying chamber (4). The infrared temperature sensor (9) is used in conjunction with the nozzle (6). The infrared temperature sensor (9) is bidirectionally electrically connected to an external microcontroller.

7. The 3D printing material feeding and jetting device for automotive prototype parts according to claim 1, characterized in that: A temperature sensor (8) is installed at the lower rear end of the conveying chamber (4). The temperature probe of the temperature sensor (8) extends into the lower interior of the conveying chamber (4). The temperature sensor (8) is bidirectionally electrically connected to an external microcontroller.

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