3D printer temperature control system and 3D printer

Abstract

A 3D printer temperature control system disclosed by the present invention comprises a storage box, a spiral conveyor, heaters, a first motor and a transmission belt, the spiral conveyor is embedded and fixed on one side of the storage box, the heaters are fixed on the outer side of the spiral conveyor, the number of the heaters is multiple, and the heaters are installed on the outer side of the spiral conveyor at equal intervals; and the transmission belt is mounted between the output end of the first motor and the rotating shaft of the spiral conveyor. The storage box moves through the first electric sliding rail, so that sand laying work can be conducted, the sand can be scraped to be flat through the scraper, meanwhile, the second electric sliding rail drives the shell to move synchronously, after sand laying is completed, the first electric sliding rail drives the storage box to reset at the moment, the scraper is lifted, the second electric sliding rail drives the shell to move and reset, and the sand laying work is completed. And during resetting, the spray head sprays glue for curing printing, and the operation is repeated, so that the sand laying and glue spraying work can be completed through one-time repeating, and the printing efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of 3D printers, and specifically to a temperature control system for a 3D printer and a 3D printer. Background Art

[0002] A 3D printer is an innovative manufacturing tool that converts digital models into three-dimensional solid objects by layer-by-layer printing. This technology not only changes the production mode of traditional manufacturing industries but also provides possibilities for individuals and small enterprises to realize their creativity and rapid prototyping. A 3D printer can directly generate complex geometric shapes from digital models, which is difficult to achieve by traditional manufacturing methods. This technology not only reduces material waste but also allows designers to freely explore and create new design concepts. The application scope of 3D printers is very wide, including multiple fields such as medical, aerospace, automotive, architecture, and education. In the medical field, 3D printing technology is used to manufacture customized prostheses, stents, and orthodontic appliances, etc.; in the aerospace field, it is used to manufacture lightweight and complex components. With the continuous progress of technology, the performance of 3D printers is gradually improving, including faster printing speed, higher printing accuracy, and more diverse printable materials.

[0003] For sand-type 3D printers, the existing equipment first lays sand, then sprays forming glue, and then lays sand again, repeating this process until the printing is completed. At this time, sand blowing work is carried out to blow away the excess sand. During printing, the sand needs to be heated to ensure the subsequent forming effect. After heating, it also needs to be sent into the laying device. This process requires manual operation during the transfer, resulting in insufficient printing continuity. At the same time, when printing, the sand is laid once and then the glue is sprayed once, and the efficiency is low during such repeated movements, reducing the printing efficiency. Therefore, there is an urgent need for a device to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a temperature control system for a 3D printer and a 3D printer to solve the problems raised in the above background art.

[0005] To achieve the above object, the present invention provides the following technical solution: a temperature control system for a 3D printer, comprising a storage box, a screw conveyor, a heater, a first motor and a transmission belt. The screw conveyor is fixedly embedded on one side of the storage box, the heater is fixed outside the screw conveyor, several heaters are provided and are equidistantly installed outside the screw conveyor, the first motor is fixed on one side of the screw conveyor, and the transmission belt is installed at the position between the output end of the first motor and the rotating shaft of the screw conveyor. When in use, sand is placed inside the storage box, and then the first motor is started. The first motor drives the screw conveyor to perform transportation work through the transmission belt, so that the sand inside the storage box is transported by the screw conveyor and is heated by the heater during the transportation process. Since the transportation speed is consistent, the heating time is the same, thus ensuring that the temperature after heating is consistent and achieving the effect of heating temperature control.

[0006] Preferably, a 3D printer comprises a bottom plate and a support frame. The temperature control system is installed at the top end of the bottom plate. A blanking mechanism for facilitating uniform blanking is arranged at the top end of the bottom plate. A transportation mechanism for facilitating the transportation of sand is arranged on one side of the blanking mechanism. A printing mechanism for facilitating printing is arranged on the support frame. A printing table is arranged between the support frames. The blanking mechanism comprises a box body, a second motor, a screw rod, a first electric push rod, a discharge chute, a baffle, a weighing device, a third motor and a storage box. The box body is fixed at the top end of the bottom plate through a mounting frame. The second motor is fixed on one side of the box body. The screw rod is fixed at the position of the output end of the second motor. The discharge chute is opened at the center position of the bottom end of the box body. The first electric push rod is fixed on one side of the box body. The baffle is fixed on one side of the first electric push rod. The weighing device is fixed at the lower end position of the box body. The third motor is fixed on one side of the weighing device. The storage box is fixed at the position of the output end of the third motor. When in use, the heated raw material is discharged into the box body through the screw conveyor. The second motor drives the screw rod to rotate, so that the raw material discharged into the box body is evenly distributed inside the box body, preventing the raw material from falling concentratedly. Then the first electric push rod drives the baffle to move, so that the baffle moves away from the discharge chute, and the raw material sand can fall into the storage box through the discharge chute. And the amount of the raw material sand entering is weighed by the weighing device. After reaching the set value, at this time, the first electric push rod drives the baffle to reset to block the position of the discharge chute, facilitating quantitative blanking.

[0007] Preferably, the transportation mechanism includes a fourth motor, a first chain gear, a transmission chain, a steering chain gear, a second chain gear, a gear lever, a transportation box and an extension rod. The fourth motor is fixed on one side of the mounting bracket of the box body. The first chain gear is fixed at the output end of the fourth motor. The steering chain gear is movably embedded on one side of the bottom plate. The second connecting gear is movably embedded on one side of the bottom plate. The transmission chain is wound around and arranged between the first chain gear, the steering chain gear and the second chain gear. The gear lever is fixed at the position between the second chain gears. The transportation box is movably installed between the transmission chains. The extension rod is fixed on one side of the transportation box. When in use, start the fourth motor. The first motor drives the first chain gear to rotate, drives the second chain gear to rotate through the transmission chain. In this way, the adjacent second chain gears are driven to rotate through the gear lever, so that the transmission chains on both sides move synchronously, thus driving the transportation box to move until the transportation box moves to the lower end of the storage box. At this time, the third motor drives the storage box to rotate and turn over, so that the raw material sand inside falls into the transportation box. Then it moves to the position between the second chain gears through the transportation box, which is convenient for the transportation of the raw material sand. The whole transportation process does not require manual assistance, thus greatly saving labor.

[0008] Preferably, the printing mechanism includes a first electric slide rail, a second electric slide rail, a storage box, a fifth motor, a sieve, a vibrator, a second electric push rod, a scraper, a gear, a movable roller, a glue injection pipe, a housing, a hose, a mounting groove, a controller, and a nozzle. The first electric slide rail is fixed inside the support frame, the second electric slide rail is fixed inside the first electric slide rail, the storage box is fixed on the moving block of the first electric slide rail, the housing is fixed on the moving block of the second electric push rod, the second electric push rod is fixed on one side of the storage box, the scraper is fixed on one side of the second electric push rod, the fifth motor is fixed on one side of the storage box, the movable roller is movably embedded at the bottom end inside the storage box, there are two movable rollers, the output end of the fifth motor is fixed on one of the movable rollers, the gear is movably embedded on one side of the storage box, the sieve is movably embedded at the lower end of the storage box, the vibrator is embedded and fixed at the top end of the sieve, the glue injection pipe is embedded and fixed inside the housing, the hose is embedded and fixed at the bottom end of the glue injection pipe, the bottom end of the hose is in a blocked state, the mounting groove is opened at the lower end of the housing, the controller is installed inside the mounting groove, and the nozzle is embedded and fixed at the lower end of the controller. The controller is convenient for controlling the nozzle to spray. When in use, the controller is installed inside the mounting groove and the hose is connected to the nozzle. The number of controllers installed can be selected according to the specifications of the printed item, so as to conveniently improve the applicable range of the equipment. After the transport box moves to the upper end of the storage box, as the transport box moves, the extension rod contacts the stop rod during the downward movement, causing the transport box to flip, so that the internal raw material sand is poured into the storage box. Then the fifth motor drives the movable roller to rotate, and at the same time, the two movable rollers are linked through the gear, so that the raw material sand inside the storage box falls on the sieve. Then the vibrator starts to drive the sieve to vibrate, so that the raw material sand moves evenly downward. And at this time, the storage box moves through the first electric slide rail, so that the laying work of the sand can be carried out. Moreover, the scraper can be used to level the sand. At the same time, the second electric slide rail drives the housing to move synchronously. After the sand laying is completed, at this time, the first electric slide rail drives the storage box to reset, and the scraper is lifted, and the second electric slide rail drives the housing to move back to the original position. When resetting, the nozzle sprays glue for solidification printing. Repeating this way, the sand laying and glue spraying work can be completed in one repetition, greatly improving the printing efficiency.

[0009] Preferably, the printing table includes a hollow table, a third electric push rod, and a forming plate. The forming plate is slidably arranged inside the hollow table. The third electric push rod is fixed at the bottom end inside the hollow table. There are four third electric push rods, which are installed at the four corners inside the hollow table, and the top end of the third electric push rod is fixed at the bottom end of the forming plate. When in use, after laying a layer of sand, the third electric push rod drives the forming plate to move downward by the distance of one layer of sand. Repeating this way ensures the normal progress of the printing work.

[0010] Preferably, one side of the discharge port of the screw conveyor is located at the top end of the box body.

[0011] Preferably, the baffle is located at the lower end of the box body to conveniently block the discharge chute.

[0012] Preferably, there are two first chain gears, and the other is movably installed on the other side of the mounting frame of the box body.

[0013] Preferably, there are two gears, which are coaxially connected to two internal movable rollers respectively, and the gears are meshed with each other.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. When the present invention is in use, the heated raw materials are discharged into the box body through the spiral conveyor. The spiral rod is driven to rotate by the second motor, so that the raw materials discharged into the box body are evenly distributed inside the box body to prevent the raw materials from falling concentratedly. Then the first electric push rod drives the baffle to move, so that the baffle moves away from the discharge chute, and the raw material sand can fall into the storage box through the discharge chute. And the amount of the raw material sand entering is weighed by the weighing device. After reaching the set value, at this time, the first electric push rod drives the baffle to reset to block the position of the discharge chute, which is convenient for quantitative discharging;

[0016] 2. When the present invention is in use, the fourth motor is started, the first motor drives the first chain gear to rotate, and drives the second chain gear to rotate through the transmission chain. In this way, the adjacent second chain gear is driven to rotate by the shift lever, so that the transmission chains on both sides move synchronously, so as to drive the transport box to move until the transport box moves to the lower end of the storage box. At this time, the third motor drives the storage box to rotate and turn over, so that the internal raw material sand falls into the transport box. Then it moves to the position between the second chain gears through the transport box, which is convenient for the transportation work of the raw material sand. The entire transportation process does not require manual assistance, thus greatly saving labor;

[0017] 3. When the present invention is in use, the controller is installed inside the installation groove, and the connecting hose is on the nozzle. The number of controllers can be selected according to the specifications of the printed item, so as to conveniently improve the applicable range of the device. After the transport box moves to the upper end of the storage box, as the transport box moves, the extension rod contacts the blocking rod during the downward movement, causing the transport box to flip, so that the internal raw material sand is poured into the storage box. Then, the fifth motor drives the movable roller to rotate, and at the same time, two movable rollers are linked through gears, so that the raw material sand inside the storage box falls on the screen. Then, the vibrator starts to drive the screen to vibrate, so that the raw material sand moves evenly downward. And at this time, the storage box moves through the first electric slide rail, so that the laying work of the sand can be carried out. Moreover, the sand can be leveled by using the scraper. At the same time, the second electric slide rail drives the housing to move synchronously. After the sand laying is completed, the first electric slide rail drives the storage box to reset, and the scraper is lifted. The second electric slide rail drives the housing to move back to its original position. When resetting, the nozzle sprays glue for curing printing. Repeating like this, the sand laying and glue spraying work can be completed in one repetition, greatly improving the printing efficiency. Brief Description of the Drawings

[0018] Figure 1 is a schematic diagram of the overall structure of a 3D printer of the present invention;

[0019] Figure 2 is a side view of the overall structure of a 3D printer of the present invention;

[0020] Figure 3 is a first sectional view of the overall structure of a 3D printer of the present invention;

[0021] Figure 4 is a second sectional view of the overall structure of a 3D printer of the present invention;

[0022] Figure 5 is an enlarged schematic view of part A of the overall structure of a 3D printer of the present invention;

[0023] Figure 6 is an enlarged schematic view of part B of the overall structure of a 3D printer of the present invention;

[0024] Figure 7 is an enlarged schematic view of part C of the overall structure of a 3D printer of the present invention;

[0025] Figure 8 is an enlarged schematic view of part D of the overall structure of a 3D printer of the present invention.

[0026] In the figure: 1. Bottom plate; 2. Storage box; 3. Support frame; 4. First electric slide rail; 5. Second electric slide rail; 6. Screw conveyor; 7. Heater; 8. First motor; 9. Transmission belt; 10. Box body; 11. Second motor; 12. Screw rod; 13. First electric push rod; 14. Fourth motor; 15. Discharge chute; 16. Baffle; 17. First chain gear; 18. Transmission chain; 19. Second chain gear; 20. Shift lever; 21. Steering chain gear; 22. Transport box; 23. Extension rod; 24. Weigher; 25. Storage box; 26. Third motor; 27. Storage box; 28. Second electric push rod; 29. Scraper; 30. Fifth motor; 31. Sieve; 32. Vibrator; 33. Shell; 34. Gear; 35. Hollow table; 36. Third electric push rod; 37. Molding plate; 38. Glue injection pipe; 39. Hose; 40. Installation groove; 41. Controller; 42. Nozzle; 43. Movable roller. Detailed implementation manner

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] Please refer to Figure 1-8 , the present invention provides a technical solution: a temperature control system for a 3D printer, including a storage box 2, a screw conveyor 6, a heater 7, a first motor 8 and a transmission belt 9. The screw conveyor 6 is fixedly embedded on one side of the storage box 2. The heater 7 is fixed to the outside of the screw conveyor 6 by bolts. A plurality of heaters 7 are provided and are equidistantly installed on the outside of the screw conveyor 6. The first motor 8 is fixed to one side of the screw conveyor 6 through a mounting bracket. The transmission belt 9 is installed between the output end of the first motor 8 and the rotating shaft of the screw conveyor 6. When in use, sand is placed inside the storage box 2, and then the first motor 8 is started. The first motor 8 drives the screw conveyor 6 to perform transportation work through the transmission belt 9, so that the sand inside the storage box 2 is transported by the screw conveyor 6 and is heated by the heater 7 during the transportation process. Since the transportation speed is the same, the heating time is the same, so as to ensure that the temperature is the same after heating and achieve the heating temperature control effect.

[0029] A 3D printer, comprising a bottom plate 1 and a support frame 3. The temperature control system is installed at the top end of the bottom plate 1. A blanking mechanism for facilitating uniform blanking is provided at the top end of the bottom plate 1. A transportation mechanism for facilitating the transportation of sand is provided on one side of the blanking mechanism. A printing mechanism for facilitating printing is provided on the support frame 3. A printing table is provided between the support frames 3. The blanking mechanism includes a box body 10, a second motor 11, a screw rod 12, a first electric push rod 13, a discharge chute 15, a baffle 16, a weighing device 24, a third motor 26 and a storage box 25. The box body 10 is fixed to the top end of the bottom plate 1 through a mounting frame. The second motor 11 is fixed to one side of the box body 10 through a mounting frame. The screw rod 12 is fixed to the output end of the second motor 11 through a coupling. One side of the discharge port of the screw conveyor 6 is located at the top end of the box body 10. The discharge chute 15 is opened at the center position of the bottom end of the box body 10. The first electric push rod 13 is fixed to one side of the box body 10 through a mounting frame. The baffle 16 is fixed to one side of the first electric push rod 13 through bolts. The baffle 16 is located at the lower end of the box body 10 and is convenient for blocking the discharge chute 15. The weighing device 24 is fixed to the lower end position of the box body 10 through bolts. The third motor 26 is fixed to one side of the weighing device 24 through a mounting frame. The storage box 25 is fixed to the output end of the third motor 26 through a coupling. During use, the heated raw material is discharged into the interior of the box body 10 through the screw conveyor 6. The second motor 11 drives the screw rod 12 to rotate, so that the raw material discharged into the interior of the box body 10 is evenly distributed in the box body 10, preventing the raw material from falling concentratedly. Then, the first electric push rod 13 drives the baffle 16 to move, so that the baffle 16 moves away from the discharge chute 15, and the raw material sand can fall into the storage box 25 through the discharge chute 15. And the amount of the raw material sand entering is weighed by the weighing device 24. After reaching the set value, at this time, the first electric push rod 13 drives the baffle 16 to reset to block the position of the discharge chute 15, facilitating quantitative blanking.

[0030] The transportation mechanism includes a fourth motor 14, a first chain gear 17, a transmission chain 18, a steering chain gear 21, a second chain gear 19, a shift lever 20, a transportation box 22, and an extension rod 23. The fourth motor 14 is fixed to one side of the mounting frame of the box body 10 through a mounting frame. The first chain gear 17 is fixed to the output end of the fourth motor 14 through a coupling. There are two first chain gears 17, and the other is movably installed on the other side of the mounting frame of the box body 10. The steering chain gear 21 is movably embedded on one side of the bottom plate 1. The second connecting gear 19 is movably embedded on one side of the bottom plate 1. The transmission chain 18 is wound around and arranged between the first chain gear 17, the steering chain gear 21, and the second chain gear 19. The shift lever 20 is welded and fixed at the position between the second chain gears 19. The transportation box 22 is movably installed between the transmission chains 18. The extension rod 23 is welded and fixed to one side of the transportation box 22. When in use, the fourth motor 14 is started. The first motor 14 drives the first chain gear 17 to rotate, drives the second chain gear 19 to rotate through the transmission chain 18. In this way, the adjacent second chain gears 19 are driven to rotate through the shift lever 20, so that the transmission chains 18 on both sides move synchronously, thus driving the transportation box 22 to move until the transportation box 22 moves to the lower end of the storage box 25. At this time, the third motor 26 drives the storage box 25 to rotate and turn over, so that the raw material sand inside falls into the transportation box 22. Then, it moves to the position between the second chain gears 19 through the transportation box 22, facilitating the transportation of the raw material sand. The entire transportation process does not require manual assistance, thus greatly saving labor.

[0031] The printing mechanism includes a first electric slide rail 4, a second electric slide rail 5, a storage box 27, a fifth motor 30, a sieve 31, a vibrator 32, a second electric push rod 28, a scraper 29, a gear 34, a movable roller 43, a glue injection pipe 38, a housing 33, a hose 39, a mounting groove 40, a controller 41, and a nozzle 42. The first electric slide rail 4 is fixed to the inner side of the support frame 3 by bolts. The second electric slide rail 5 is fixed to the inner side of the first electric slide rail 4 by bolts. The storage box 27 is fixed to the moving block of the first electric slide rail 4 by bolts. The housing 33 is fixed to the moving block of the second electric push rod 28 by bolts. The second electric push rod 28 is fixed to one side of the storage box 27 by a mounting frame. The scraper 29 is fixed to one side of the second electric push rod 28 by bolts. The fifth motor 30 is fixed to one side of the storage box 27 by a mounting frame. The movable roller 43 is movably embedded in the inner bottom end of the storage box 27. There are two movable rollers 43. The output end of the fifth motor 30 is fixed to one of the movable rollers 43 by a coupling. The gear 34 is movably embedded in one side of the storage box 27. There are two gears 34, which are coaxially connected to the two inner movable rollers 43 respectively, and the gears 34 are meshed with each other. The sieve 31 is movably embedded at the lower end of the storage box 27. The vibrator 32 is embedded and fixed at the top of the sieve 31. The glue injection pipe 38 is embedded and fixed inside the housing 33. The hose 39 is embedded and fixed at the bottom end of the glue injection pipe 38. The bottom end of the hose 39 is in a blocked state. The mounting groove 40 is opened at the lower end of the housing 33. The controller 41 is installed inside the mounting groove 40. The nozzle 42 is embedded and fixed at the lower end of the controller 41. The controller 41 facilitates controlling the nozzle 42 to perform spraying. When in use, the controller 41 is installed inside the mounting groove 40, and the hose 39 is connected to the nozzle 42. The number of controllers 41 installed can be selected according to the specifications of the printed item, so as to conveniently improve the applicable range of the device. When the transport box 22 moves to the upper end of the storage box 27, as the transport box 22 moves, the extension rod 23 contacts the stop rod 20 during the downward movement, causing the transport box 22 to flip, so that the internal raw sand is poured into the storage box 27. Then, the fifth motor 30 drives the movable roller 43 to rotate, and at the same time, the two movable rollers 43 are linked through the gear 34, so that the raw sand inside the storage box 27 falls on the sieve 31. Then, the vibrator 32 is started to drive the sieve 31 to vibrate, so that the raw sand moves evenly downward. And at this time, the storage box 27 moves through the first electric slide rail 4, so that the laying work of the sand can be carried out. Moreover, the scraper 29 can be used to scrape the sand flat. At the same time, the second electric slide rail 5 drives the housing 33 to move synchronously. After the sand laying is completed, at this time, the first electric slide rail 4 drives the storage box 27 to reset, and the scraper 29 is lifted. The second electric slide rail 5 drives the housing 33 to move back to the original position. When resetting, the nozzle 42 sprays glue for curing printing. Repeating this process can complete the sand laying and glue spraying work in one repetition, greatly improving the printing efficiency.

[0032] The printing table includes a hollow table 35, a third electric push rod 36 and a forming plate 37. The forming plate 37 is slidably arranged inside the hollow table 35. The third electric push rod 36 is fixed to the bottom end inside the hollow table 35 through a mounting bracket. There are four third electric push rods 36, which are installed at the four corners inside the hollow table 35, and the top end of the third electric push rod 36 is fixed to the bottom end of the forming plate 37. When in use, after laying a layer of sand, the third electric push rod 36 drives the forming plate 37 to move downward by the distance of a layer of sand, and so on, to ensure the normal progress of the printing work.

[0033] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0034] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A 3D printer temperature control system, comprising a storage box (2), a screw conveyor (6), a heater (7), a first motor (8) and a transmission belt (9), characterized in that: The screw conveyor (6) is embedded and fixed on one side of the storage box (2), the heater (7) is fixed on the outside of the screw conveyor (6), a plurality of heaters (7) are provided and are installed at equal intervals on the outside of the screw conveyor (6), the first motor (8) is fixed on one side of the screw conveyor (6), and the transmission belt (9) is installed between the output end of the first motor (8) and the rotating shaft of the screw conveyor (6).

2. A 3D printer, comprising a base plate 1 and a support frame 3, characterized in that: The temperature control system is installed on the top of the bottom plate (1); a feeding mechanism for facilitating uniform feeding is arranged on the top of the bottom plate (1); a transport mechanism for facilitating sand transport is arranged on one side of the feeding mechanism; a printing mechanism for facilitating printing is arranged on the support frame (3); a printing table is arranged between the support frames (3); the feeding mechanism comprises a box (10), a second motor (11), a screw rod (12), a first electric push rod (13), a feeding trough (15), a baffle (16), a weighing device (24), a third motor (26) and a storage box (25); the box (10) is fixed by a mounting frame At the top of the bottom plate (1), the second motor (11) is fixed on one side of the box body (10), the screw rod (12) is fixed on the output end of the second motor (11), the discharge trough (15) is opened at the center of the bottom end of the box body (10), the first electric push rod (13) is fixed on one side of the box body (10), the baffle (16) is fixed on one side of the first electric push rod (13), the weighing device (24) is fixed on the lower end of the box body (10), the third motor (26) is fixed on one side of the weighing device (24), and the storage box (25) is fixed on the output end of the third motor (26).

3. A 3D printer according to claim 2, characterized in that: The transport mechanism comprises a fourth motor (14), a first sprocket (17), a transmission chain (18), a steering sprocket (21), a second sprocket (19), a shift rod (20), a transport box (22) and an extension rod (23); the fourth motor (14) is fixed to one side of a mounting frame of a box body (10); the first sprocket (17) is fixed to an output end of the fourth motor (14); the steering sprocket (21) is movably embedded in one side of a bottom plate (1); the second connecting gear (19) is movably embedded in one side of the bottom plate (1); the transmission chain (18) is arranged around the first sprocket (17), the steering sprocket (21) and the second sprocket (19); the shift rod (20) is fixed to a position between the second sprocket (19); the transport box (22) is movably installed between the transmission chain (18); and the extension rod (23) is fixed to one side of the transport box (22).

4. A 3D printer according to claim 3, characterized in that: The printing mechanism comprises a first electric slide rail (4), a second electric slide rail (5), a storage box (27), a fifth motor (30), a screen (31), a vibrator (32), a second electric push rod (28), a scraper (29), a gear (34), a movable roller (43), a glue injection tube (38), a shell (33), a hose (39), a mounting groove (40), a controller (41) and a nozzle (42); the first electric slide rail (4) is fixed to the inner side of the support frame (3); the second electric slide rail (5) is fixed to the inner side of the first electric slide rail (4); the storage box (27) is fixed to the moving block of the first electric slide rail (4); the shell (33) is fixed to the moving block of the second electric push rod (28); the second electric push rod (28) is fixed to one side of the storage box (27); the scraper (29) is fixed to one side of the second electric push rod (28); The fifth motor (30) is fixed on one side of the storage box (27); the movable roller (43) is movably embedded in the bottom end of the storage box (27); two movable rollers (43) are provided; the output end of the fifth motor (30) is fixed on one side of the movable roller (43); the gear (34) is movably embedded in one side of the storage box (27); the screen (31) is movably embedded in the lower end of the storage box (27); the vibrator (32) is embedded and fixed on the top of the screen (31); the glue injection tube (38) is embedded and fixed in the shell (33); the hose (39) is embedded and fixed at the bottom end of the glue injection tube (38); the bottom end of the hose (39) is in a blocked state; the mounting groove (40) is opened at the lower end of the shell (33); the controller (41) is installed in the mounting groove (40); and the nozzle (42) is embedded and fixed at the lower end of the controller (41).

5. A 3D printer according to claim 4, characterized in that: The printing table comprises a hollow table (35), a third electric push rod (36) and a molding plate (37); the molding plate (37) is slidably arranged inside the hollow table (35); the third electric push rod (36) is fixed at the bottom end inside the hollow table (35); four third electric push rods (36) are arranged and installed at the four corners inside the hollow table (35); and the top end of the third electric push rod (36) is fixed at the bottom end of the molding plate (37).

6. A 3D printer according to claim 5, characterized in that: One side of the discharge port of the screw conveyor (6) is located at the top of the box body (10).

7. A 3D printer according to claim 6, characterized in that: The baffle (16) is located at the lower end of the box body (10) to conveniently shield the discharge chute (15).

8. A 3D printer according to claim 7, characterized in that: Two first sprockets (17) are provided, and the other one is movably mounted on the other side of the mounting frame of the box body (10).

9. A 3D printer according to claim 8, characterized in that: Two gears (34) are provided, which are coaxially connected to two internal movable rollers (43) respectively, and the gears (34) are meshed with each other.

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