A method and structure for using a 3D printing chamber with fast switching between large and small sizes

Abstract

The present invention provides a method for using a 3D printing chamber with a large-small size fast switch and a structure thereof, wherein a small-size printing chamber for printing small-size objects is separated by a partition in the large-size printing chamber; when the large-size printing chamber is used, the main base plate and the auxiliary base plate are lifted and lowered in linkage; when the small-size printing chamber is used, only the auxiliary base plate is lifted and lowered; the lifting device comprises a first motor, a second motor, a first lead screw and a second lead screw, the first motor is connected to the main base plate through the first lead screw, and the second motor is connected to the auxiliary base plate through the second lead screw; the control circuit system comprises a first switch for controlling the on and off of the second motor, a second switch for controlling the on and off of the first motor and a main switch, the first switch and the second switch are respectively arranged on two branches of a parallel circuit, and the main switch is arranged on the main circuit. The present invention can reasonably select a large or small-size printing chamber according to the size of the parts, and has the advantages of saving powder, high powder utilization rate, high printing efficiency, and convenient loading and unloading.

Description

Technical Field

[0001] The invention belongs to the field of 3D printers, and in particular relates to a method for using and a structure of a 3D printing chamber capable of quickly switching between large and small sizes. Background Art

[0002] 3D printing technology appeared in the 1980s. It is a technology that can realize rapid prototyping and additive manufacturing of materials. Its biggest advantage is that it breaks away from the constraints of complex molds in traditional prototyping methods and can quickly form parts with complex shapes and structures. According to the differences in printing principles, the current mainstream 3D printing technologies include fused deposition modeling (FDM), binder jet 3D printing (BJ3DP), selective laser sintering (SLS), electron beam melting (EBM), etc.

[0003] In the field of 3D printing, BJ3DP technology has the advantages of fast printing speed, no need for support materials during the printing process, a large range of printed parts sizes, and relatively low costs. It is widely used in metal parts forming, sand casting, artworks, and architecture. Its working principle is to achieve component forming through layered bonding of powder. The specific working method of BJ3DP printing is: the scraper in the powder spreading device spreads the powder from the powder supply bin into the forming bin, and the excess powder is pushed into the powder collecting bin for collection. Then the print head selectively sprays the binder under the control of the computer; the bonding of the previous layer of powder is completed, the forming bin drops a certain distance, the powder supply bin rises a certain height, and the powder spreading device pushes out the next layer of powder; this is repeated, and finally the three-dimensional forming of the parts is completed.

[0004] At present, the metal powder used in BJ3DP printing is prepared by gas atomization, water atomization or electrolysis, which has high preparation costs and makes the powder expensive. In addition, the purity, oxygen content and surface activity of the recycled metal powder will be affected, and the performance of the printed sample will not be as good as the original powder. If a large-size printing chamber is used to print a small-size sample, most of the powder will need to be recycled. Therefore, designing a 3D printing chamber structure that can achieve rapid switching between large and small sizes is of great significance for laboratory research and experimental work.

[0005] The BJ3DP printing device published in the Chinese patent "Floor-type 3DP printing device" (authorization announcement number: CN208993098U) includes a structural component, a powder spreading component and an inkjet component. Among them, the structural component includes a working box and a lifting member, the powder spreading component includes a first driving member and a powder spreading member, and the inkjet component includes a second driving member and an inkjet member. The working process of the device is: driven by the first driving member, the powder spreading member moves to the other end along the Y direction and then returns to the starting point to complete a powder spreading work; at this time, the inkjet member can move along the X→Y→X→Y direction and return to the starting point under the drive of the second driving member to complete an inkjet work, and then the side plate of the working box rises by one layer thickness under the drive of the lifting member, and this cycle is repeated until the side plate of the working box rises to the highest point under the action of the lifting member to complete the entire printing process. This device occupies a small area and has a low installation height, which improves the installation portability and printing efficiency of the BJ3DP printing device. However, when it is necessary to print small-sized samples and only a portion of the printing chamber space is needed, the device still needs to use powder equivalent to the volume of the entire printing chamber, resulting in large powder consumption, low utilization rate and high cost.

[0006] The 3D printing equipment published in the Chinese patent "A desktop 3D printer based on 3DP technology" (authorization announcement number: CN209126175U) mainly includes: a main control mechanism, a truss, a feeding mechanism, a printing mechanism, a powder cylinder and a lifting mechanism. The working principle of the device is that under the control of the main control mechanism, when spreading powder, the powder bottom plate of the forming cylinder drops a height of the thickness of the powder layer, and the bottom plate of the powder supply cylinder rises a height of the thickness of the powder layer; the Y-axis feeding mechanism drives the powder roller to push out some powder, spread it flat in the forming cylinder and compact it; the X-axis feeding mechanism drives the print head to spray the binder to complete a printing job, and repeats this process until the printing is completed. The device has a compact structure and occupies a small area, but the printing bin space cannot be adjusted according to demand, and the size adaptability of the printed part is not strong. Summary of the invention

[0007] In order to overcome the deficiencies in the prior art, an object of the present invention is to provide a 3D printing chamber that can quickly switch between large and small sizes.

[0008] The present invention provides a 3D printing chamber with a large-small size fast switch, the printing chamber has a simple and compact structure, and the structure and space of the printing chamber can be quickly adjusted to achieve the purpose of saving powder.

[0009] The purpose of the present invention is achieved by at least one of the following technical solutions.

[0010] The present invention provides a method for using a large-small size fast switching 3D printing chamber, comprising the following steps:

[0011] When you need to print large-size objects, remove the partition and adjust the height of the sub-base plate to be flush with the main base plate;

[0012] The main switch, the first switch and the second switch are turned on, the first motor drives the main bottom plate, and the second motor drives the auxiliary bottom plate, so that the main bottom plate and the auxiliary bottom plate are linked in the same direction at the same time to complete the printing of large-size objects;

[0013] When you need to print small-sized objects, install the partition on the main base plate;

[0014] When the main switch and the first switch are turned on, the second motor drives the second lead screw to move the auxiliary base plate up and down, thereby printing and forming small-sized objects.

[0015] The present invention also provides the specific structure of the printing chamber.

[0016] The present invention provides a large-small size fast switching 3D printing chamber, comprising: a large-size printing chamber, a partition, a main bottom plate, a secondary bottom plate, a lifting device and a control circuit system;

[0017] The partition is arranged in the large-size printing chamber, and is used to separate the large-size printing chamber from the small-size printing chamber;

[0018] The main bottom plate and the auxiliary bottom plate can be raised and lowered independently. When using a large-size print chamber, the main bottom plate and the auxiliary bottom plate are raised and lowered in tandem; when using a small-size print chamber, only the auxiliary bottom plate is raised and lowered;

[0019] The lifting device comprises a first motor, a second motor, a first lead screw and a second lead screw, the first motor is connected to the main base plate through the first lead screw, and the second motor is connected to the auxiliary base plate through the second lead screw;

[0020] The control circuit system includes a second switch for controlling the on and off of the first motor, a first switch for controlling the on and off of the second motor, and a main switch. The first switch and the second switch are respectively arranged on two branches of the parallel circuit, and the main switch is arranged on the main circuit.

[0021] Furthermore, when the main switch and the first switch are turned on at the same time, the small-size printing chamber works alone to print small-size objects; when the main switch, the first switch and the second switch are turned on at the same time, the first motor drives the auxiliary base plate and the second motor drives the main base plate to move in the same direction at the same time to achieve the forming of large-size objects.

[0022] Furthermore, the printing chamber includes a large-sized forming chamber and a large-sized powder supply chamber, and both the forming chamber and the powder supply chamber are provided with the partition to separate the inner chamber space into a small-sized printing chamber for printing small-sized objects.

[0023] Furthermore, the large-size printing chamber includes an outer wall panel that surrounds the interior to form a printing chamber, and an inner partition is arranged in the large-size printing chamber to separate the printing chamber into a large-size forming chamber and a large-size powder supply chamber, and the main bottom plate and the auxiliary bottom plate are respectively arranged perpendicular to the outer wall panel.

[0024] Furthermore, the partition includes a vertical plate, a partition base fixedly arranged at the bottom of the vertical plate, and a reinforcing rib arranged between the vertical plate and the partition base, the partition base is detachably fixed to the main bottom plate, and the two sides of the vertical plate are detachably fixed to the outer wall plate and the inner partition plate, respectively. The reinforcing rib is arranged in the middle of the partition.

[0025] Furthermore, a plurality of base positioning pins are arranged on the main base plate, and the base positioning pins are connected to the partition base.

[0026] Furthermore, two lifting ears are arranged on both sides of the vertical plate, and the lifting ears are connected to the outer wall plate and the inner partition plate respectively through a flat head positioning pin and a cylindrical positioning pin.

[0027] Furthermore, the cylindrical locating pin can also be replaced by a flat head locating pin.

[0028] Furthermore, the lifting device also includes a first guide rod for guiding the lifting of the main bottom plate and a second guide rod for guiding the lifting of the auxiliary bottom plate.

[0029] Furthermore, the printing chamber bottom plate includes a main bottom plate and a sub-bottom plate, and two guide rods are horizontally arranged below the main bottom plate; a lead screw is arranged at the center of gravity of the main bottom plate in the middle position of the two guide rods; two base locating pins are arranged on the side of the main bottom plate close to the sub-bottom plate; the base locating pins have a diameter of 5mm-20mm, a height of 5mm-20mm, and a spacing of 60mm-90mm.

[0030] Furthermore, the lead screw is driven by a motor, and the motor and the lead screw are connected via a pulley.

[0031] Furthermore, two guide rods are longitudinally arranged below the auxiliary bottom plate; a lead screw is arranged at the middle position of the guide rods and at the center of gravity of the auxiliary bottom plate.

[0032] Furthermore, the length of the auxiliary bottom plate is equal to the width of the main bottom plate; the width of the auxiliary bottom plate is 100mm-200mm.

[0033] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0034] The 3D printing chamber provided by the present invention can realize printing of large-size parts and small-size parts with matching printing chambers on a single 3D printer, and has the advantages of saving powder, good adaptability to part size, high space utilization, high printing efficiency, convenient loading and unloading, and simple structure. The 3D printing chamber avoids the disadvantage of still having to use a large-size printing chamber space when printing small-size parts, and can meet the needs of users in different usage scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A front view of a 3D printing chamber structure provided in an embodiment;

[0036] Figure 2 A top view of a 3D printing chamber structure provided in an embodiment;

[0037] Figure 3 A left view of the 3D printing chamber structure provided in the embodiment;

[0038] Figure 4 A front view of a 3D printing chamber partition structure provided in an embodiment;

[0039] Figure 5 A left view of the 3D printing chamber partition structure provided in the embodiment;

[0040] Figure 6 A top view of a 3D printing chamber partition structure provided in an embodiment;

[0041] Among them, the first motor 1; the first screw 2; the main base plate 3; the outer wall plate 4; the lifting ear 5; the partition 6; the auxiliary base plate 7; the base positioning pin 8; the second screw 9; the first guide rod 10; the second motor 11; the first switch 12; the second switch 13; the main switch 14; the large-size forming bin 15; the large-size powder supply bin 16; the cylindrical positioning pin 17; the inner partition 18; the partition base 19; the reinforcing rib 20; the flat-head positioning pin 21; and the second guide rod 22. DETAILED DESCRIPTION

[0042] The specific implementation of the present invention is further described below in conjunction with examples, but the implementation and protection of the present invention are not limited thereto. It should be noted that if there are processes that are not particularly described in detail below, they can be implemented or understood by those skilled in the art with reference to the prior art. If the manufacturer of the reagents or instruments used is not indicated, they are deemed to be conventional products that can be purchased commercially.

[0043] The present invention provides a 3D printing chamber with large-small size fast switching, comprising: a large-size printing chamber, a partition 6, a main base plate 3, a sub-base plate 7, a lifting device and a control circuit system. The printing chamber base plate is divided into two parts, one part is the main base plate 3, and the other part is the sub-base plate 7, in order to realize the independent movement of the sub-base plate 7. The partition 6 is arranged at the separation between the main base plate 3 and the sub-base plate 7, in order to reduce the printing space for printing small-sized parts. When it is necessary to print small-sized parts, the partition 6 is installed on the main base plate 3, connected by the base locating pin 8, and the ears 5 arranged on both sides of the partition 6 are connected to the outer wall plate 4 through the flat head locating pin 21, and connected to the inner partition 18 through the cylindrical locating pin 17. The main switch 14 and the first switch 12 are turned on, and the second motor 11 drives the second screw 9 to move the sub-base plate 7 up and down to realize the printing and forming of small-sized parts. When it is necessary to print large-sized parts, remove the cylindrical positioning pin 17 and the flat-head positioning pin 21, take out the partition 6, and lower the auxiliary base plate 7 to be flush with the main base plate 3. Turn on the main switch 14, the first switch 12 and the second switch 13, the first motor 1 drives the main base plate 3, and the second motor 11 drives the auxiliary base plate 7, so that the main base plate 3 and the auxiliary base plate 7 are linked in the same direction at the same time to achieve the printing of large-sized parts. The 3D printing chamber can realize the printing of large-sized parts and small-sized parts with matching printing chambers on a 3D printer, and has the advantages of saving powder, good adaptability to part size, high powder utilization, high printing efficiency, convenient loading and unloading, and simple structure. It avoids the disadvantage of still having to use large-sized printing chamber space when printing small-sized parts, and meets the needs of users in different application scenarios.

[0044] Figure 1 FIG. 1 is a schematic diagram of the structure of one embodiment of the present invention. Figure 1 As shown, a 3D printing chamber with large-small size fast switching includes a first motor 1, a first lead screw 2, a main base plate 3, an outer wall plate 4, a lifting ear 5, a partition 6, a secondary base plate 7, a base positioning pin 8, a second lead screw 9, a first guide rod 10, a second motor 11, a first switch 12, a second switch 13, a main switch 14, a large-size forming chamber 15, a large-size powder supply chamber 16, a cylindrical positioning pin 17, an inner partition 18, a partition base 19, a reinforcing rib 20, a flat head positioning pin 21, and a second guide rod 22. In order to ensure that the powder supply is sufficient to fill the forming chamber, the powder supply chamber space should be slightly larger than the forming chamber. The forming chamber has the same structure as the printing chamber, and only the forming chamber structure is marked and explained.

[0045] The first motor 1 and the second motor 11 are used to provide power for the lifting movement of the main bottom plate 3 and the auxiliary bottom plate 7 of the printer, and to control the thickness of the printing layer;

[0046] The main bottom plate 3 and the auxiliary bottom plate 7 are used to: connect the lead screw and support the powder;

[0047] The outer wall plate 4 is used to support and fix the partition plate 6 and connect them into a whole;

[0048] Function of the lifting lug 5: vertical positioning function, so that the partition 6 is connected to the large-size printing chamber, and it is convenient to remove the partition 6 when it is disassembled;

[0049] The partition 6 is used to: reduce the printing space, print small-sized parts, and support powder;

[0050] The base positioning pin 8 is used to: connect with the partition base 19 and position in the horizontal direction;

[0051] The second lead screw 9 and the first lead screw 2 function: connect the bottom plate and the motor to transmit power;

[0052] Functions of the first guide rod 10 and the second guide rod 22: connection and guidance, so that the bottom plate can move vertically up and down;

[0053] Functions of the first switch 12 and the second switch 13: controlling the lifting and lowering of the main bottom plate 3 and the auxiliary bottom plate 7;

[0054] Main switch 14 function: control the on and off of the main circuit;

[0055] The large-size forming chamber 15 is used for: printing and forming parts;

[0056] The large-sized powder supply bin 16 is used to: load powder and provide powder for parts printing;

[0057] The cylindrical positioning pin 17 is used to connect the partition located in the powder supply bin and the partition located in the forming bin with the inner partition to play a role in positioning and fixing.

[0058] The inner partition 18 is used to separate the printing chamber into a powder supply chamber and a forming chamber;

[0059] The partition base 19 is used to connect the main bottom plate and support the partition;

[0060] The reinforcing ribs 20 are used to: increase the supporting strength of the partition;

[0061] The flat-head positioning pin 21 is used to connect the partition plate 6 and the outer wall plate 4 to prevent the partition plate 6 from moving during the printing process.

[0062] Reference Figure 1 As shown, the present invention provides a large-to-small size fast switching 3D printing chamber, comprising: a large-size printing chamber, a partition 6, a main base plate 3, a sub-base plate 7, a lifting device and a control circuit system, wherein the large-size printing chamber is arranged in the box body; the partition 6 is arranged in the large-size printing chamber, and is used to separate a small-size printing chamber for printing small-size objects; the main base plate 3 and the sub-base plate 7 can be lifted and lowered independently, and when the large-size printing chamber is used, the main base plate 3 and the sub-base plate 7 are lifted and lowered in conjunction; when the small-size printing chamber is used, only the sub-base plate 7 is lifted and lowered.

[0063] The lifting device includes: a first motor 1, a second motor 11, a first screw 2 and a second screw 9, the first motor 1 is connected to the main base plate 3 through the first screw 2, and the second motor 11 is connected to the auxiliary base plate 7 through the second screw 9; the control circuit system includes a second switch 13 for controlling the on and off of the first motor 1, a first switch 12 for controlling the on and off of the second motor 11, and a main switch 14, the first switch 12 and the second switch 13 are respectively arranged on two branches of the parallel circuit, and the main switch 14 is arranged on the main circuit.

[0064] Specifically, in one embodiment of the present invention, the main bottom plate 3 and the auxiliary bottom plate 7 form a printing chamber bottom plate, and two first guide rods 10 are horizontally arranged below the main bottom plate 3; a first lead screw 2 is arranged at the middle position of the two first guide rods 10 and at the center of gravity of the main bottom plate 3, and the top end of the first lead screw 2 is connected to the main bottom plate 3, such as Figure 3 As shown; preferably, the spacing between the first guide rod 10 under the main base plate and the first lead screw 2 is 80mm-120mm, and two base locating pins 8 are provided on the main base plate 3 and close to the side of the secondary base plate 7; preferably, the base locating pins 8 have a diameter of 5mm-20mm, a height of 5mm-20mm, and a spacing of 60mm-90mm.

[0065] The first lead screw 2 is driven by the first motor 1 , and the first motor 1 is connected to the first lead screw 2 via a pulley. The power is transmitted from the first motor 1 to the first lead screw 2 , thereby realizing the lifting movement of the main base plate 3 .

[0066] In one embodiment of the present invention, two second guide rods 22 are longitudinally arranged under the sub-bottom plate 7; a second lead screw 9 is arranged in the middle position between the two second guide rods 22 and at the center of gravity of the sub-bottom plate 7. Preferably, the distance between the second guide rod 22 under the sub-bottom plate 7 and the second lead screw 9 is 60mm-100mm.

[0067] See also Figure 2 The two first guide rods 10 are arranged in the transverse direction, and the two second guide rods 22 are arranged in the longitudinal direction, so that the printing chamber structure can be compact and occupy a small area.

[0068] The length of the auxiliary bottom plate 7 is equal to the width of the main bottom plate 3; preferably, the width of the auxiliary bottom plate 7 is 100 mm-200 mm.

[0069] In one embodiment of the present invention, see Figure 4-Figure 6The partition 6 includes a vertical plate, a partition base 19 fixedly arranged at the bottom of the vertical plate, and a reinforcing rib 20 arranged between the vertical plate and the partition base 19, the partition base 19 is detachably fixed to the main bottom plate 3, and the two sides of the vertical plate are detachably fixed to the outer wall plate 4 and the inner partition 18. Preferably, the reinforcing rib 20 is arranged at the middle position of the partition 6, and the thickness of the reinforcing rib 20 is 10mm-30mm.

[0070] In one embodiment of the present invention, a plurality of base positioning pins 8 are disposed on the main base plate 3 , and the base positioning pins 8 are connected to the partition base 19 .

[0071] In one embodiment of the present invention, two ears 5 are provided on both sides of the vertical plate of the partition 6, and the ears 5 are respectively connected to the outer wall plate 4 and the inner partition 18 through a flat head positioning pin 21 and a cylindrical positioning pin 17. Preferably, the flat head positioning pin 21 and the cylindrical positioning pin 17 have a nominal diameter of 8mm-16mm and a length of 20mm-40mm.

[0072] The method of using the aforementioned large-small size fast switching 3D printing chamber is as follows:

[0073] When large-sized parts need to be printed, the flat-head positioning pin 21 and the cylindrical positioning pin 17 are removed, and then the partition plate 6 is taken out, and the auxiliary bottom plate 7 is lowered to be flush with the main bottom plate 3;

[0074] The main switch 14, the first switch 12 and the second switch 13 are turned on, the first motor 1 drives the main base plate 3, and the second motor 11 drives the auxiliary base plate 7, so that the main base plate 3 and the auxiliary base plate 7 are linked in the same direction at the same time, thereby printing and forming large-size parts;

[0075] When it is necessary to print small-sized parts, the partition 6 is installed on the main base plate 3 and connected through the base positioning pins 8. The ears 5 on both sides of the partition 6 are connected to the outer wall plate 4 through the flat head positioning pins 21 and connected to the inner partition 18 through the cylindrical positioning pins 17;

[0076] When the main switch 14 and the first switch 12 are turned on, the second motor 11 drives the second lead screw 9 to move the sub-base plate 7 up and down, thereby printing and forming small-sized parts. This avoids the disadvantage of still having to use a large-sized printing chamber space when printing small-sized parts, and can meet the needs of users in different usage scenarios. It has the advantages of saving powder, high powder utilization rate, high printing efficiency, easy loading and unloading, and simple structure.

[0077] The above embodiments are only preferred implementation modes of the present invention and are only used to explain the present invention rather than to limit the present invention. Any changes, substitutions, modifications, etc. made by those skilled in the art without departing from the spirit of the present invention should fall within the scope of protection of the present invention.

Claims

1. A method for using a 3D printing chamber with fast switching between large and small sizes, characterized in that: A 3D printing chamber with a large-to-small size rapid switchover is used, comprising: a large-size printing chamber, a partition (6), a main base plate (3), a secondary base plate (7), a lifting device and a control circuit system; The partition plate (6) is arranged in the large-size printing chamber and is used to separate the large-size printing chamber from the small-size printing chamber; The main bottom plate (3) and the auxiliary bottom plate (7) can be raised and lowered independently. When a large-size printing chamber is used, the main bottom plate (3) and the auxiliary bottom plate (7) are raised and lowered in conjunction with each other; when a small-size printing chamber is used, only the auxiliary bottom plate (7) is raised and lowered. The lifting device comprises a first motor (1), a second motor (11), a first lead screw (2) and a second lead screw (9), the first motor (1) being connected to the main base plate (3) via the first lead screw (2), and the second motor (11) being connected to the auxiliary base plate (7) via the second lead screw (9); The control circuit system comprises a first switch (12) for controlling the on and off of the second motor (11), a second switch (13) for controlling the on and off of the first motor (1), and a main switch (14), wherein the first switch (12) and the second switch (13) are respectively arranged on two branches of the parallel circuit, and the main switch (14) is arranged on the main circuit; The method of use comprises the following steps: When it is necessary to print a large-sized object, remove the partition (6) and adjust the height of the auxiliary bottom plate (7) to be flush with the main bottom plate (3); The main switch (14), the first switch (12) and the second switch (13) are turned on, the first motor (1) drives the main base plate (3), and the second motor (11) drives the auxiliary base plate (7), so that the main base plate (3) and the auxiliary base plate (7) are linked together in the same direction at the same time, thereby completing the printing of large-sized objects; When it is necessary to print small-sized objects, the partition plate (6) is installed on the main base plate (3); The main switch (14) and the first switch (12) are turned on, and the second motor (11) drives the second lead screw (9) to move the auxiliary base plate (7) up and down, thereby printing and forming small-sized objects; When the main switch (14) and the first switch (12) are turned on at the same time, the small-size printing chamber works alone to print small-size objects; when the main switch (14), the first switch (12) and the second switch (13) are turned on at the same time, the second motor (11) drives the auxiliary base plate (7) and the first motor (1) drives the main base plate (3) in the same direction, thereby realizing the forming of large-size objects.

2. The method for using a large-small size fast switching 3D printing chamber according to claim 1, characterized in that: The printing chamber comprises a large-sized forming chamber (15) and a large-sized powder supply chamber (16), and the large-sized forming chamber (15) and the large-sized powder supply chamber (16) are both provided with the partition plate (6) so as to separate the large-sized printing chamber space into a small-sized printing chamber for printing small-sized objects.

3. The method for using a large-small size fast switching 3D printing chamber according to claim 1, characterized in that: The large-size printing chamber comprises an outer wall plate (4) which surrounds the interior to form a printing chamber, an inner partition plate (18) is arranged in the large-size printing chamber to separate the large-size printing chamber into a large-size forming chamber (15) and a large-size powder supply chamber (16), and the main bottom plate (3) and the auxiliary bottom plate (7) are respectively arranged perpendicular to the outer wall plate (4).

4. The method for using a large-small size fast switching 3D printing chamber according to claim 1, characterized in that: The partition (6) comprises a vertical plate, a partition base (19) fixedly arranged at the bottom of the vertical plate, and a reinforcing rib (20) arranged between the vertical plate and the partition base (19); the partition base (19) is detachably fixed to the main bottom plate (3); and two sides of the vertical plate are detachably fixed to the outer wall plate (4) and the inner partition (18) of the large-size printing chamber.

5. The method for using a large-small size fast switching 3D printing chamber according to claim 4, characterized in that: A plurality of base positioning pins (8) are provided on the main base plate (3), and the base positioning pins (8) are connected to the partition base (19).

6. The method for using a large-small size fast switching 3D printing chamber according to claim 5, characterized in that: Lifting ears (5) are provided on both sides of the vertical plate of the partition (6), and both sides of the partition (6) are connected to the outer wall plate (4) and the inner partition (18) through the lifting ears (5) and positioning pins.

7. The method for using a large-small size fast switching 3D printing chamber according to claim 1, characterized in that: The lifting device further comprises a first guide rod (10) for guiding the lifting of the main bottom plate (3) and a second guide rod (22) for guiding the lifting of the auxiliary bottom plate (7).

8. The method for using a large-small size fast switching 3D printing chamber according to any one of claims 1 to 7, characterized in that: The length of the secondary bottom plate is equal to the width of the main bottom plate.

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