Multi-jet switching type composite 3D printer

Abstract

The application discloses a multi-nozzle switching type composite material 3D printer, and relates to the technical field of 3D printers, which comprises a supporting frame, a linear module is arranged at the top of the supporting frame, a magnetic platform is mounted to the outer surface of the linear module, a lifting mechanism is arranged at the top of the magnetic platform, and a cleaning assembly is arranged on the lifting mechanism. The cleaning assembly comprises a multi-nozzle 3D printer body used for printing composite materials, and a plurality of telescopic pipes are arranged in the multi-nozzle 3D printer body. In the process of upwardly resetting the nozzle body after use, the corresponding collecting box is rotated to be directly below the nozzle body, the remaining waste liquid in the nozzle body is collected, and the cleaning intensity of the nozzle mouth part of the nozzle body is further enhanced in a negative pressure adsorption mode, so that the problem of waste liquid drops generated in the nozzle body is effectively prevented, and the raw materials are prevented from being polluted without back suction.

Description

Technical Field

[0001] This invention relates to the field of 3D printer technology, specifically to a multi-nozzle switching composite material 3D printer. Background Technology

[0002] Composite material 3D printers are specialized 3D printing equipment designed specifically for molding fiber-reinforced composite materials. They combine 3D printing technology with composite material manufacturing. Unlike traditional plastic 3D printers that only print pure resin and plastic parts, composite material 3D printers can precisely combine reinforcing fibers such as carbon fiber, glass fiber, and aramid fiber with epoxy resin, PLA, and nylon resin matrices to print high-strength, high-rigidity, and lightweight composite material parts. The mechanical properties of these parts are comparable to some metals, while the weight is significantly reduced. This perfectly solves the problems of complex processes, high customization difficulty, and high cost of small-batch production in traditional composite materials. Multi-nozzle switching composite material 3D printers can quickly switch between different types of composite materials and meet the needs of multifunctional composite molding of rigid + flexible and high-temperature + reinforced materials.

[0003] Existing multi-nozzle switching composite material 3D printers achieve integrated printing of various composite materials, continuous fibers and matrix resins, and materials with different colors and properties through time-sharing switching and collaborative operation of multiple independent nozzles. When switching nozzles, the molten material in the previous nozzle can easily continue to flow downwards and drip onto the printing platform or workpiece surface under its own weight and residual pressure, resulting in overflow, spots, and stringing. To address these issues, most existing multi-nozzle switching composite material 3D printers use a back-pull method to recover excess liquid material from the used nozzle. However, the back-pull action will reverse the flow of molten material containing residual old material, fiber dust, or carbonized impurities from the nozzle back to the upstream fresh material area, directly contaminating the clean material and affecting the normal operation of the multi-nozzle switching composite material 3D printer.

[0004] Therefore, we propose a multi-nozzle switching composite material 3D printer to address the problems mentioned above. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-nozzle switching composite material 3D printer to solve the problem mentioned in the background art that the waste liquid generated during the nozzle switching process of composite material 3D printers easily contaminates the raw materials.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-nozzle switching composite material 3D printer, comprising a support frame, a linear module disposed on the top of the support frame, a magnetic suction platform mounted on the outer surface of the linear module, a lifting mechanism disposed on the top of the magnetic suction platform, and a cleaning assembly, the cleaning assembly comprising a multi-nozzle 3D printer body for printing composite materials, multiple telescopic tubes disposed inside the multi-nozzle 3D printer body, the bottom of each telescopic tube being fixedly connected to a nozzle body for ejecting material, a carrier frame fixedly disposed on the top of the multi-nozzle 3D printer body, multiple collection boxes for collecting waste material disposed at the bottom of the carrier frame, and an adsorption tube for negative pressure adsorption of waste material being fixedly connected to the bottom of each of the multiple collection boxes.

[0007] Preferably, the cleaning assembly further includes a drive motor, and drive rollers are fixedly installed on both inner walls of the lifting mechanism.

[0008] Preferably, a drive motor is fixedly mounted on the outer surface of the lifting mechanism by screws, the output end of the drive motor is fixedly connected to the outer surface of one of the drive rollers, and a toothed belt is coupled between the outer surfaces of the two drive rollers.

[0009] Preferably, the outer surface of the lifting mechanism is slidably fitted with a mounting plate, and a positioning gear is fixed on the outer surface of the mounting plate. The outer surface of the positioning gear meshes with the inner wall of the toothed belt.

[0010] Preferably, the outer surface of the mounting plate is fixedly connected to the outer surface of the multi-nozzle 3D printer body, a fixing frame is fixed on the top of the support frame, and multiple take-up rollers are provided on the top of the fixing frame. 3D printing filaments are wound on the outer surface of the multiple take-up rollers, and one end of each 3D printing filament is inserted into the interior of the multi-nozzle 3D printer body.

[0011] Preferably, a permanent magnet is fixedly sleeved on the outer surface of the nozzle body, multiple electromagnets are installed on the top of the support frame, and multiple anti-pressure frames are fixed on the bottom of the support frame.

[0012] Preferably, a stepper motor is fixed to the outer surface of the pressure-resistant frame by screws, and a drive shaft is fixedly connected to the output end of the stepper motor. A coil spring is fixedly installed on the inner top surface of the pressure-resistant frame. The outer surface of the drive shaft is fixedly connected to one end of the coil spring. Both ends of the drive shaft extend movably to the outside of the pressure-resistant frame. One end of the drive shaft is movably embedded in the inside of the support frame. The outer surface of the drive shaft is fixedly connected to the inner wall of the collection box. The top of the collection box is in contact with the top of the support frame.

[0013] Preferably, an electromagnetic valve is provided on the outer surface of the adsorption tube, one end of the adsorption tube is fixedly connected to a corrugated pipe, and one end of the corrugated pipe is fixedly connected to an extension tube.

[0014] Preferably, a negative pressure chamber is fixedly installed at the bottom of the support frame, a pressure sensor is installed on the top surface inside the negative pressure chamber, and a collection chamber is fixedly connected to the bottom of the negative pressure chamber.

[0015] Preferably, a valve is provided on the outer surface of the negative pressure chamber, one end of the extension pipe extends into the interior of the negative pressure chamber, and an air pump is provided on the outer surface of the collection chamber, with the input end of the air pump extending into the interior of the negative pressure chamber.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. During the process of resetting the nozzle body upwards after use, rotate the corresponding collection box to directly below the nozzle body to collect the remaining waste liquid inside the nozzle body. At the same time, the cleaning intensity of the nozzle body opening is further enhanced by negative pressure adsorption, which effectively prevents the problem of waste liquid dripping from the nozzle body and does not require back-pulling, thus preventing contamination of raw materials.

[0018] 2. To facilitate omnidirectional 3D printing of composite materials with multiple nozzles, the linear module allows for easy linear movement of the magnetic platform. The lifting mechanism 4 can drive the multi-nozzle 3D printer body to move up and down. Activating the drive motor connects the lifting mechanism 4 to the multi-nozzle 3D printer body, enabling the multi-nozzle 3D printer body to move left and right, up and down, providing convenience for 3D printing.

[0019] 3. During the collection of waste liquid, the negative pressure chamber is first made to be in a negative pressure state. When the pressure reaches a certain value, the solenoid valve corresponding to the collection box is opened to realize the connection between the adsorption tube, the bellows and the extension tube and the inside of the negative pressure chamber. Under the action of negative pressure, the waste liquid at the nozzle mouth is adsorbed, thereby effectively preventing the waste generated in the nozzle body from dripping downwards. In addition, the waste liquid is quickly cleaned up in the process of back-drawing without contaminating the raw materials. Attached Figure Description

[0020] Figure 1 This is a frontal perspective view of the present invention;

[0021] Figure 2 This is a perspective view of the linear module portion of the present invention;

[0022] Figure 3 This is a perspective view of the lifting mechanism of the present invention;

[0023] Figure 4 This is a perspective view of the drive roller portion of the present invention;

[0024] Figure 5 This is a partial sectional perspective view of the cleaning component of the present invention;

[0025] Figure 6 This is a perspective cross-sectional view of the cleaning component portion of the present invention from another angle;

[0026] Figure 7 This is a partial sectional perspective view of the collection compartment of the present invention;

[0027] Figure 8 This is a perspective cross-sectional view of the negative pressure chamber portion of the present invention.

[0028] In the picture:

[0029] 1. Support frame; 2. Linear module; 3. Magnetic platform; 4. Lifting mechanism; 5. Fixing frame; 6. Cleaning assembly; 601. Drive motor; 602. Drive roller; 603. Toothed belt; 604. Mounting plate; 605. Positioning gear; 606. Multi-nozzle 3D printer body; 607. Rewind roller; 608. 3D printing filament; 609. Telescopic tube; 610. Nozzle body; 611. Permanent magnet; 612. Electromagnet; 613. Bearing frame; 614. Pressure-resistant frame; 615. Stepper motor; 616. Drive shaft; 617. Coil spring; 618. Collection box; 619. Adsorption tube; 620. Solenoid valve; 621. Bellows; 622. Negative pressure chamber; 623. Collection chamber; 624. Pressure sensor; 625. Valve; 626. Air pump. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please see Figures 1-8 The present invention provides a technical solution: a multi-nozzle switching composite material 3D printer, including a support frame 1, a linear module 2 disposed on the top of the support frame 1, a magnetic suction platform 3 mounted on the outer surface of the linear module 2, a lifting mechanism 4 disposed on the top of the magnetic suction platform 3, and a cleaning component 6. The cleaning component 6 includes a multi-nozzle 3D printer body 606 for printing composite materials, a plurality of telescopic tubes 609 disposed inside the multi-nozzle 3D printer body 606, and a nozzle body 610 for ejecting material fixedly connected to the bottom of each telescopic tube 609. A carrier frame 613 is fixedly fixed on the top of the multi-nozzle 3D printer body 606, and a plurality of collection boxes 618 for collecting waste are disposed at the bottom of the carrier frame 613. An adsorption tube 619 for negative pressure adsorption of waste is fixedly connected to the bottom of each of the plurality of collection boxes 618.

[0032] In the multi-nozzle switching composite material 3D printer, to facilitate omnidirectional printing of objects, the linear module 2 allows for convenient linear movement of the magnetic platform 3. The linear module 2 consists of a drive unit, a lead screw, and a limiting rod. The bottom of the magnetic platform 3 is threadedly connected to the lead screw and movably connected to the limiting rod. The drive unit drives the lead screw to rotate, thus enabling the magnetic platform 3 to move back and forth along the surface of the lead screw. Additionally, as... Figure 3 As shown, the lifting mechanism 4 consists of a forward and reverse motor, a threaded tube, and a positioning tube, which can drive the multi-nozzle 3D printer body 606 to move up and down. In addition, multiple telescopic tubes 609 are fixedly connected to the output ends of multiple nozzles in the multi-nozzle 3D printer body 606. The telescopic tube 609 is made of a flexible metal tube with a spring on its outer surface. When it is no longer subjected to external tension, it can return to its original position under the elastic action of the spring. This telescopic tube 609 is made of a high-temperature resistant flexible metal tube, which is telescopic, flexible, and adaptable to the vertical displacement of the nozzle body 610. Its inner wall is smooth, preventing fiber from getting stuck or blocked, and providing a complete seal to prevent material leakage and air intake. The connection between the telescopic tube 609 and the nozzle body 610... The connection facilitates the vertical movement of the nozzle body 610. Furthermore, during the switching of the nozzle body 610, simply move the unused nozzle body 610 up and down to the top of the support frame 613, and move the desired nozzle body 610 down to the bottom of the support frame 613. While moving the nozzle body 610 upwards, rotate the corresponding collection box 618 directly below the nozzle body 610 to collect any remaining waste liquid inside. Simultaneously, negative pressure adsorption further enhances the cleaning intensity of the nozzle body 610's nozzle opening, effectively preventing waste liquid dripping from the nozzle body 610 without requiring back-pulling, thus preventing contamination of the raw materials.

[0033] like Figures 5-8 As shown, the cleaning assembly 6 also includes a drive motor 601. Drive rollers 602 are fixedly installed on both inner walls of the lifting mechanism 4. The drive motor 601 is fixedly installed on the outer surface of the lifting mechanism 4 by screws. The output end of the drive motor 601 is fixedly connected to the outer surface of one of the drive rollers 602. A toothed belt 603 is coupled and sleeved between the outer surfaces of the two drive rollers 602. An installation plate 604 is slidably sleeved on the outer surface of the lifting mechanism 4. A positioning gear 605 is fixed on the outer surface of the installation plate 604. The outer surface of the positioning gear 605 meshes with the inner wall of the toothed belt 603. The model of the drive motor 601 is 17HS4401.

[0034] During the printing process, in order to facilitate the back-and-forth movement of the multi-nozzle 3D printer body 606, the drive motor 601 is first started, which drives the drive roller 602 connected to it to rotate, which in turn drives the toothed belt 603 to rotate, which in turn drives another drive roller 602 to rotate. As a result, the positioning gear 605 moves back and forth along the outer surface of the lifting mechanism 4 under the push of the toothed belt 603, thereby moving the multi-nozzle 3D printer body 606. At the same time, through the action of the mounting plate 604, the lifting mechanism 4 is connected to the multi-nozzle 3D printer body 606, so that the multi-nozzle 3D printer body 606 can move left and right and up and down.

[0035] like Figures 5-8 As shown, the outer surface of the mounting plate 604 is fixedly connected to the outer surface of the multi-nozzle 3D printer body 606. A fixing frame 5 is fixed on the top of the support frame 1. Multiple take-up rollers 607 are provided on the top of the fixing frame 5. 3D printing filaments 608 are wound around the outer surface of the multiple take-up rollers 607. One end of each 3D printing filament 608 is inserted into the interior of the multi-nozzle 3D printer body 606.

[0036] Among them, such as Figure 4 As shown, each take-up roller 607 is wound with 3D printing filament 608. Each filament corresponds to an independent nozzle, follows an independent path, and is not interconnected. The 3D printing filament 608 enters the feeding mechanism inside the multi-nozzle 3D printer body 606 from the top of the printer, then enters the heating block of the nozzle through the feeding tube, is heated and melted into a liquid state, and finally is ejected outward from the nozzle body 610.

[0037] like Figures 5-8 As shown, a permanent magnet 611 is fixedly sleeved on the outer surface of the nozzle body 610, a plurality of electromagnets 612 are installed on the top of the support frame 613, and a plurality of pressure-resistant frames 614 are fixed on the bottom of the support frame 613. The model of the electromagnet 612 is P20 / 15 DC12V / 24V, and the model of the permanent magnet 611 is D20×5 neodymium iron boron.

[0038] To facilitate the vertical movement of the nozzle body 610, when a nozzle body 610 needs to move downwards, the PLC controller electrically connects the electromagnet 612 corresponding to that nozzle body 610 to an external power source, generating a magnetic field. Under the action of magnetic attraction, the corresponding permanent magnet 611 is attracted, driving the nozzle body 610 downwards until the permanent magnet 611 and the electromagnet 612 are connected. At this point, the nozzle body 610 has moved downwards to the bottom of the support frame 613, and 3D printing can then be performed.

[0039] like Figures 5-8As shown, a stepper motor 615 is fixed to the outer surface of the pressure-resistant frame 614 by screws. The output end of the stepper motor 615 is fixedly connected to a drive shaft 616. A coil spring 617 is fixedly installed on the inner top surface of the pressure-resistant frame 614. The outer surface of the drive shaft 616 is fixedly connected to one end of the coil spring 617. Both ends of the drive shaft 616 extend movably through to the outside of the pressure-resistant frame 614. One end of the drive shaft 616 is movably embedded in the inside of the support frame 613. The outer surface of the drive shaft 616 is fixedly connected to the inner wall of the collection box 618. The top of the collection box 618 is in contact with the top of the support frame 613. The model of the stepper motor 615 is 17HS3401.

[0040] During the process of rotating one of the collection boxes 618 to collect waste, the corresponding stepper motor 615 is first started by the PLC controller, which drives the drive shaft 616 to rotate, thereby tightening the coil spring 617, which in turn drives the collection box 618 to rotate. By adhering the collection box 618 to the surface of the support frame 613, the stability of the collection box 618 during movement is ensured.

[0041] like Figures 5-8 As shown, an electromagnetic valve 620 is provided on the outer surface of the adsorption tube 619. One end of the adsorption tube 619 is fixedly connected to a corrugated pipe 621, and one end of the corrugated pipe 621 is fixedly connected to an extension pipe. A negative pressure chamber 622 is fixedly installed at the bottom of the support frame 613. A pressure sensor 624 is provided on the top surface inside the negative pressure chamber 622. A collection chamber 623 is fixedly connected to the bottom of the negative pressure chamber 622. A valve 625 is provided on the outer surface of the negative pressure chamber 622. One end of the extension pipe extends into the interior of the negative pressure chamber 622. An air pump 626 is provided on the outer surface of the collection chamber 623. The input end of the air pump 626 extends into the interior of the negative pressure chamber 622. The pressure sensor 624 is model BMP280, and the air pump 626 is model AC01212V.

[0042] When the collection box 618 is rotated to a position directly below the corresponding nozzle body 610, the air pump 626 is activated to draw gas into the negative pressure chamber 622, thereby creating a negative pressure state inside the negative pressure chamber 622. The pressure value inside the negative pressure chamber 622 is detected by the pressure sensor 624. When the pressure reaches a certain value, the solenoid valve 620 corresponding to the collection box 618 is opened, realizing the connection between the adsorption tube 619, the bellows tube 621, and the extension tube and the inside of the negative pressure chamber 622. Under the action of pressure difference, the liquid in the collection box 618 is driven into the inside of the negative pressure chamber 622 along the adsorption tube 619, the bellows tube 621, and the extension tube. Under the action of negative pressure, the waste liquid at the nozzle body 610 is adsorbed, thereby effectively preventing the waste generated in the nozzle body 610 from dripping downwards. In the process of back-drawing without contaminating the raw materials, the waste liquid is quickly cleaned up.

[0043] The usage and working principle of this device: During use, the multi-nozzle switching composite material 3D printer facilitates omnidirectional printing of objects. The linear module 2 allows for convenient linear movement of the magnetic platform 3. The lifting mechanism 4 drives the multi-nozzle 3D printer body 606 up and down. During printing, to facilitate the back-and-forth movement of the multi-nozzle 3D printer body 606, firstly, the drive motor 601 is started, causing it to drive the connected drive roller 602 to rotate. This, in turn, drives the toothed belt 603 to rotate, which in turn drives another drive roller 602 to rotate. This causes the positioning gear 605 to move back and forth along the outer surface of the lifting mechanism 4 under the push of the toothed belt 603, thus moving the multi-nozzle 3D printer body 606. At the same time, the mounting plate 604 connects the lifting mechanism 4 to the multi-nozzle 3D printer body 606, allowing the multi-nozzle 3D printer body 606 to move left and right, and up and down. Each take-up roller 607 contains 3D printing filament 608, which enters the feeding mechanism inside the multi-nozzle 3D printer body 606 from the top of the printer, then enters the heating block of the nozzle through the feeding tube, where it is heated and melted into a liquid state, and finally ejected outward from the nozzle body 610. When a nozzle body 610 needs to move downward, the PLC controller electrically connects the electromagnet 612 corresponding to that nozzle body 610 to an external power supply, causing it to generate a magnetic field, which attracts the corresponding permanent magnet under the action of magnetic attraction. 611. The nozzle body 610 is moved downwards, causing the corresponding telescopic tube 609 to extend until the permanent magnet 611 and the electromagnet 612 are connected. At this point, the nozzle body 610 moves downwards to the bottom of the support frame 613, allowing 3D printing to begin. After the nozzle body 610 is printed, the electromagnet 612 corresponding to the nozzle body 610 is turned off, preventing it from generating a magnetic field. This causes the nozzle body 610 to reset under the elastic force of the spring installed on the telescopic tube 609. Then, the stepper motor 615 corresponding to the nozzle body 610 is started, causing the drive shaft 616 to rotate. This causes the coil spring 617 to tighten, thereby rotating the collection box 618 to the position corresponding to the nozzle body 610. When the pressure is below, the air pump 626 can be started to draw gas into the negative pressure chamber 622, thereby creating a negative pressure state inside the chamber. The pressure sensor 624 detects the pressure value inside the negative pressure chamber 622. When the pressure reaches a certain value, the solenoid valve 620 corresponding to the collection box 618 is opened, connecting the adsorption tube 619, the bellows tube 621, and the extension tube to the inside of the negative pressure chamber 622. Under the action of the pressure difference, the liquid in the collection box 618 is driven into the interior of the negative pressure chamber 622 along the adsorption tube 619, the bellows tube 621, and the extension tube. Under the action of negative pressure, the liquid adsorbs the waste liquid at the nozzle opening of the nozzle body 610, completing the rapid cleaning of the waste liquid. After the waste liquid is cleaned, the stepper motor 615 can be turned off.Since the stepper motor 615 does not have a self-locking function, when it is turned off, the coil spring 617, being in a tightened state, will reset under its own elastic force, thereby driving the corresponding drive shaft 616 to rotate until the collection box 618 resets.

[0044] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-nozzle switching composite material 3D printer, comprising a support frame (1), a linear module (2) disposed on the top of the support frame (1), a magnetic suction platform (3) mounted on the outer surface of the linear module (2), and a lifting mechanism (4) disposed on the top of the magnetic suction platform (3), characterized in that: The cleaning component (6) includes a multi-nozzle 3D printer body (606) for printing composite materials. The multi-nozzle 3D printer body (606) has multiple telescopic tubes (609) inside. The bottom of each telescopic tube (609) is fixedly connected to a nozzle body (610) for ejecting material. The top of the multi-nozzle 3D printer body (606) is fixedly connected to a support frame (613). The bottom of the support frame (613) is provided with multiple collection boxes (618) for collecting waste. The bottom of each collection box (618) is fixedly connected to an adsorption tube (619) for negative pressure adsorption of waste.

2. The multi-nozzle switching composite material 3D printer according to claim 1, characterized in that: The cleaning component (6) also includes a drive motor (601), and drive rollers (602) are fixedly installed on both sides of the inner wall of the lifting mechanism (4).

3. The multi-nozzle switching composite material 3D printer according to claim 2, characterized in that: The outer surface of the lifting mechanism (4) is fixedly mounted with a drive motor (601) by screws. The output end of the drive motor (601) is fixedly connected to the outer surface of one of the drive rollers (602). A toothed belt (603) is coupled between the outer surfaces of the two drive rollers (602).

4. The multi-nozzle switching composite material 3D printer according to claim 3, characterized in that: The outer surface of the lifting mechanism (4) is slidably fitted with an installation plate (604), and a positioning gear (605) is fixed on the outer surface of the installation plate (604). The outer surface of the positioning gear (605) meshes with the inner wall of the toothed belt (603).

5. The multi-nozzle switching composite material 3D printer according to claim 4, characterized in that: The outer surface of the mounting plate (604) is fixedly connected to the outer surface of the multi-nozzle 3D printer body (606). A fixing frame (5) is fixed on the top of the support frame (1). Multiple take-up rollers (607) are provided on the top of the fixing frame (5). 3D printing filaments (608) are wound on the outer surface of the multiple take-up rollers (607). One end of each 3D printing filament (608) is inserted into the interior of the multi-nozzle 3D printer body (606).

6. The multi-nozzle switching composite material 3D printer according to claim 5, characterized in that: A permanent magnet (611) is fixedly sleeved on the outer surface of the nozzle body (610), a plurality of electromagnets (612) are installed on the top of the support frame (613), and a plurality of pressure-resistant frames (614) are fixed on the bottom of the support frame (613).

7. The multi-nozzle switching composite material 3D printer according to claim 6, characterized in that: The outer surface of the pressure-resistant frame (614) is fixed with a stepper motor (615) by screws. The output end of the stepper motor (615) is fixedly connected to a drive shaft (616). A coil spring (617) is fixedly installed on the inner top surface of the pressure-resistant frame (614). The outer surface of the drive shaft (616) is fixedly connected to one end of the coil spring (617). Both ends of the drive shaft (616) extend movably through to the outside of the pressure-resistant frame (614). One end of the drive shaft (616) is movably embedded in the inside of the support frame (613). The outer surface of the drive shaft (616) is fixedly connected to the inner wall of the collection box (618). The top of the collection box (618) is in contact with the top of the support frame (613).

8. The multi-nozzle switching composite material 3D printer according to claim 7, characterized in that: An electromagnetic valve (620) is provided on the outer surface of the adsorption tube (619). One end of the adsorption tube (619) is fixedly connected to a corrugated pipe (621), and one end of the corrugated pipe (621) is fixedly connected to an extension tube.

9. The multi-nozzle switching composite material 3D printer according to claim 8, characterized in that: A negative pressure chamber (622) is fixedly installed at the bottom of the support frame (613). A pressure sensor (624) is installed on the top surface inside the negative pressure chamber (622). A collection chamber (623) is fixedly connected to the bottom of the negative pressure chamber (622).

10. The multi-nozzle switching composite material 3D printer according to claim 9, characterized in that: A valve (625) is provided on the outer surface of the negative pressure chamber (622), one end of the extension tube extends into the interior of the negative pressure chamber (622), and an air pump (626) is provided on the outer surface of the collection chamber (623), with the input end of the air pump (626) extending into the interior of the negative pressure chamber (622).

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