Modular powder cartridge for a 3D printer

Abstract

The application relates to the technical field of printer powder boxes, and discloses a modular powder box of a 3D printer, which comprises a modular powder box mechanism, the modular powder box mechanism comprises a transparent powder box, a powder box connecting piece, a powder valve seat and a valve shaft, four powder cavities are arranged in the transparent powder box in a separated mode, the powder box connecting piece is connected to the bottom of the transparent powder box, powder flow channels are arranged in the positions corresponding to the four powder cavities and are opened through the positions, the bottom of the powder cavity is open, the powder valve seat is connected to the bottom of the powder box connecting piece, a shaft hole is arranged in one end of the powder valve seat and is opened through the end along the length direction of the powder valve seat, the valve shaft is in interference fit in the shaft hole, four channels are arranged in the top of the powder valve seat and are opened through the top along the axial direction of the valve shaft, the four channels are communicated with the four powder flow channels in a one-to-one mode, four valve shaft channels are arranged in the side wall of the valve shaft and are opened through the side wall along the axial direction of the valve shaft, and the four valve shaft channels are in one-to-one correspondence with the four channels, so that the storage of multi-element powder is realized, and the simultaneous printing of diversified powder in single printing is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of printer powder cartridge, in particular to a modular powder cartridge of 3D printer. BACKGROUND

[0002] The printing principle of the existing metal 3D printer is metal powder melting technology, and metal powder needs to be continuously transported to the printing position (one layer of powder is transported for each printing layer) during the entire printing process. The storage and transportation of metal powder are also technical points of the metal 3D printer. The influence of air on the powder needs to be considered when storing the powder, and the influence of air on the powder also needs to be considered when transporting the powder, and the uniformity of the powder after being transported to the printing position also needs to be considered. The mainstream powder feeding methods of the 3D printers on the market are up-feeding, down-feeding and powder feeder feeding. In the up-feeding method, the powder tank and the forming cylinder are side by side, and the transfer of the powder is through a scraper. The working method is that the scraper is at the rightmost side, the piston cylinder in the powder feeding cylinder lifts the powder by one layer of height, the scraper moves to the forming cylinder direction, the powder is scraped from the powder feeding cylinder to the forming cylinder, laser sintering printing is performed, the scraper returns to the right side, and the next cycle is started. In the down-feeding method, the powder tank is above the forming cylinder (it can also be understood that the powder tank is above the forming chamber), and the main working method is that the scraper returns to the reset point, a layer of powder is taken in the powder tank by the powder taking structure and falls on the bottom plate of the forming chamber through the powder channel, the scraper moves (towards the printing base plate), laser sintering printing is performed, the scraper is reset again, and the cycle is entered. In the powder feeder feeding method, the powder tank exists independently, and the printing method is different from the above two methods. The powder feeding method is suitable for the method of sintering and printing at the same time, and a separate structure provides the function. In summary, in the existing powder feeding method, external power needs to be provided to meet the function of quantitative powder taking, and in the powder adding process of the powder tank, the metal powder may be affected by air (the influence of air humidity on the dryness of the powder). Moreover, only one kind of element powder can be placed in the powder tank, and the diversified powder printing cannot be met. SUMMARY

[0003] The present application aims to overcome the shortcomings of the prior art, and provides a modular powder cartridge of 3D printer, which realizes the storage of multiple element powders to meet the simultaneous printing of diversified powders in a single printing.

[0004] The application aims to realize the technical scheme as follows: a modular powder box of a 3D printer, comprising a modular powder box mechanism, the modular powder box mechanism comprising a transparent powder box, a powder box connecting piece, a powder valve seat and a valve shaft, four powder cavities are arranged in the transparent powder box in a separated manner, for storing different element powders, the powder box connecting piece is connected to the bottom of the transparent powder box, the powder box connecting piece is provided with powder flow channels corresponding to the positions of the four powder cavities, the bottom of the powder cavity is open, for connecting the powder flow channels, the powder valve seat is connected to the bottom of the powder box connecting piece, one end of the powder valve seat is provided with a shaft hole along the length direction of the powder valve seat, the valve shaft is in interference fit in the shaft hole, four channels are provided in the top of the powder valve seat along the axial direction of the valve shaft, the four channels are communicated with the four powder flow channels one by one, four valve shaft channels are provided in the side wall of the valve shaft along the axial direction of the valve shaft, the four valve shaft channels correspond to the four channels one by one, and the valve shaft is rotated to make the powder flow channels and the channels communicated or closed.

[0005] In some embodiments, a lower frame is fixed to the bottom of the transparent powder box, the inner wall of the powder box connecting piece is formed with a boss, the lower frame is fitted in the powder box connecting piece and supported by the boss, the outer wall of the lower frame is attached to the inner wall of the powder box connecting piece, and the side wall of the powder box connecting piece is provided with a powder box screw, the powder box screw is threadedly connected to the lower frame.

[0006] In some embodiments, the size of the powder flow channel gradually decreases along the direction close to the powder valve seat, and the size of the bottom of the powder flow channel is the same as that of the channel.

[0007] In some embodiments, one end of the valve shaft is provided with a power assembly, the power assembly comprising a power box and a power steering engine, the power box is installed at one end of the powder box connecting piece, the power steering engine is installed on the end face of the power box close to the powder valve seat, and the output shaft of the power steering engine is drivingly connected to one end of the valve shaft.

[0008] In some embodiments, the power assembly further comprises a battery compartment, the end face of the power box away from the powder box connecting piece is provided with a battery mounting hole, the battery compartment is assembled in the battery mounting hole, a button cell is arranged in the battery compartment, the end of the battery compartment away from the powder box connecting piece is provided with an external thread, the battery mounting hole is provided with an internal thread, the battery compartment is threadedly fitted in the battery mounting hole, and the battery compartment is used for supplying power to the power steering engine.

[0009] In some embodiments, the modular powder box mechanism is mounted on the bidirectional scraper mechanism, the bidirectional scraper mechanism comprises a scraper body frame, a powder limiting piece and a scraper assembly, the scraper body frame is provided with a mounting channel in the height direction of the scraper body frame, the powder valve seat is mounted in the mounting channel, the powder limiting piece is mounted at the bottom of the scraper body frame, the powder limiting piece is provided with four powder channels in the height direction of the powder limiting piece, the four powder channels correspond to the four channels one by one, the scraper assembly is arranged on both sides of the scraper body frame in the width direction of the scraper body frame, the scraper assembly comprises a scraper adjusting piece, a scraper fixing piece and a scraper strip, the scraper adjusting piece is mounted on the scraper body frame, the scraper fixing piece is connected to the side wall of the scraper adjusting piece, and the scraper strip is mounted at the bottom of the scraper fixing piece.

[0010] In some embodiments, the scraper body frame is integrally formed with a rectangular table on both sides, the rectangular table is provided with a leveling assembly at both ends, the leveling assembly comprises a micrometer head and a tension spring, the scraper adjusting piece is mounted on the scraper body frame by screws, the scraper adjusting piece is located below the rectangular table, the two ends of the tension spring are connected to the rectangular table and the scraper adjusting piece respectively, the micrometer head is mounted on the top of the rectangular table, the rectangular table is provided with an adjusting hole, and the telescopic head of the micrometer head passes through the adjusting hole and abuts against the scraper adjusting piece.

[0011] In some embodiments, the rectangular table is provided with a tension spring hole, the side wall of the rectangular table is threadedly connected with a tension spring screw, the tension spring screw passes through the tension spring hole, the top of the scraper adjusting piece is provided with a mounting hole, the side wall of the scraper adjusting piece is provided with an open pin, and the open pin passes through the mounting hole, and the two ends of the tension spring are sleeved on the tension spring screw and the open pin respectively.

[0012] In some embodiments, the scraper fixing piece comprises two half-type fixing pieces, the two half-type fixing pieces are arranged and connected in the width direction of the scraper body frame, and the top of the scraper strip is clamped between the two half-type fixing pieces.

[0013] In some embodiments, the two sides of the scraper strip are integrally formed with at least one protruding portion, the half-type fixing piece is provided with a limiting groove near the end face of the scraper strip, and the protruding portion is fitted in the limiting groove.

[0014] The beneficial effects of the present application are:

[0015] 1. The present application realizes the storage of multi-element powder to meet the simultaneous printing of diversified powder in single printing.

[0016] 2. The transparent powder box and powder box connector are connected to the powder valve seat internally and sealed externally. The powder flow channel is connected or closed by the rotation of the valve shaft, so that the powder feeding environment is sealed, avoiding the contact between powder and air during the powder adding process, and reducing the impact of powder quality on the printed product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of a modular powder box mechanism in a modular powder box of a 3D printer according to the present invention;

[0018] Figure 2 A cross-sectional view of a modular powder box mechanism in a modular powder box of a 3D printer according to the present invention;

[0019] Figure 3 This is a schematic structural diagram of a valve shaft in a modular powder box of a 3D printer according to the present invention;

[0020] Figure 4 This is a schematic structural diagram of a powder valve seat in a modular powder box of a 3D printer according to the present invention;

[0021] Figure 5 This is a schematic structural diagram of a powder box connector in a modular powder box of a 3D printer according to the present invention;

[0022] Figure 6 This is a schematic structural diagram of a transparent powder box in a modular powder box of a 3D printer of the present invention;

[0023] Figure 7 A schematic diagram of the structure of a modular powder box for a 3D printer of the present invention Figure 1 ;

[0024] Figure 8 A schematic diagram of the structure of a modular powder box for a 3D printer of the present invention Figure 2 ;

[0025] Figure 9 This is a schematic structural diagram of a scraper main frame in a modular powder box of a 3D printer of the present invention;

[0026] Figure 10 This is a schematic structural diagram of a powder limiting member in a modular powder box of a 3D printer according to the present invention;

[0027] Figure 11 This is a front view of a modular powder box for a 3D printer according to the present invention;

[0028] Figure 12 This is a left side view of a modular powder box for a 3D printer according to the present invention;

[0029] In the figure, 1-bidirectional scraper mechanism, 2-modular powder box mechanism, 3-scraper main frame, 4-powder limiting member, 5-mounting channel, 6-powder channel, 7-scraper adjustment member, 8-scraper fixing member, 9-scraper strip, 10-transparent powder box, 11-powder box connector, 12-powder chamber, 13-powder flow channel, 14-rectangular table, 15-thousandth head, 16-tension spring, 17-screw, 18-adjustment hole, 19-tension spring hole, 20-tension spring screw, 21-mounting hole, 22-cotter pin, 23-protrusion, 24-limiting groove, 28-powder valve seat, 29-valve shaft, 30-valve shaft channel, 31-shaft hole, 32-channel, 33-lower frame member, 34-boss, 35-powder box screw, 36-power box, 37-power servo, 38-battery mounting hole, 39-battery compartment, 40-button battery. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0031] like Figures 1 to 12 As shown, a modular powder box of a 3D printer includes a modular powder box mechanism 2, which includes a transparent powder box 10, a powder box connector 11, a powder valve seat 28 and a valve shaft 29. The transparent powder box 10 is internally isolated and provided with four powder chambers 12 for storing powders of different elements. The powder box connector 11 is connected to the bottom of the transparent powder box 10. The positions of the powder box connector 11 corresponding to the four powder chambers 12 are all penetrated by a powder flow channel 13. The bottom opening of the powder chamber 12 is used to connect the powder flow channel 13. The powder valve seat 28 is connected to the bottom of the powder box connector 11. One end of the powder valve seat 28 is penetrated by an axial hole 31 along its own length direction. The valve shaft 29 is interference fit in the axial hole 31. The top of the powder valve seat 28 is penetrated by four channels 32 along the axial direction of the valve shaft 29. The four channels 32 are communicated with the four powder flow channels 13 in a one-to-one correspondence. The side wall of the valve shaft 29 The valve shaft 29 is provided with four valve shaft channels 30 along its own axial direction, and the four valve shaft channels 30 correspond to the four channels 32 one by one. The valve shaft 29 is rotated to connect or close the powder flow channel 13 and the channel 32. The valve shaft 29 is interference fit in the shaft hole 31, so that the outer wall of the valve shaft 29 is tightly attached to the inner wall of the shaft hole 31, preventing powder from entering between the valve shaft 29 and the shaft hole 31. By rotating the valve shaft 29, the upper and lower ends of the valve shaft channel 30 are connected to the powder flow channel 13 and the channel 32 respectively, so that the powder in the powder chamber 12 flows out through the powder flow channel 12, the valve shaft channel 30, and the channel 32 in turn, performing a powder spreading action. The valve shaft 29 is rotated to make the valve shaft channel 30 of the valve shaft 29 fit the side wall of the shaft hole 31, thereby isolating the powder flow channel 13 and the channel 32 through the valve shaft 29, thereby preventing powder from flowing down, realizing the storage of multi-element powder to meet the simultaneous printing of diversified powders in a single printing.

[0032] In some embodiments, as shown in Figures 1 to 6 The bottom of the transparent powder box 10 is fixed with a lower frame 33, the inner wall of the powder box connector 11 is formed with a boss 34, the lower frame 33 is fitted in the powder box connector 11 and supported by the boss 34, the outer wall of the lower frame 33 is fitted with the inner wall of the powder box connector 11, the side wall of the powder box connector 11 is provided with a powder screw 35, the powder screw 35 is threadedly connected with the lower frame 33, so that the connection position of the transparent powder box 10 and the powder box connector 11 is in a sealed state, preventing powder from spilling out, the size of the powder flow channel 13 gradually decreases in the direction close to the powder valve seat 28, the bottom size of the powder flow channel 13 is the same as the size of the channel 32, so that the powder passes through the powder flow channel 13 and completely enters the channel 32, and is completely discharged through the channel 32, so that the powder is fully utilized, the powder feeding environment is in a sealed state, avoiding the contact between the powder and air during the powder adding process, and reducing the influence of the powder quality on the printing product.

[0033] In some embodiments, as shown in Figures 2 to 6 One end of the valve shaft 29 is provided with a power assembly, the power assembly includes a power box 36 and a power steering gear 37, the power box 36 is installed at one end of the powder box connector 11, the power box 36 is installed with the power steering gear 37 at the end face close to the powder valve seat 28, the output shaft of the power steering gear 37 is drivingly connected with one end of the valve shaft 29, the power assembly further includes a battery compartment 39, the power box 36 is provided with a battery mounting hole 38 at the end face away from the powder box connector 11, the battery compartment 39 is assembled in the battery mounting hole 38, the battery compartment 39 is provided with a button cell 40, the battery compartment 39 is provided with an external thread at the end away from the powder box connector 11, the battery mounting hole 38 is provided with an internal thread, the battery compartment 39 is threadedly fitted in the battery mounting hole 38, the battery compartment 39 is used for supplying power to the power steering gear 37, the battery compartment 39 is installed on the power box 36 in a threaded manner, facilitating the installation and removal of the battery compartment 39, so as to replace the button cell 40, the power steering gear 37 is powered by the battery compartment 39, and the valve shaft 29 is driven to rotate by the power steering gear 37, so as to realize the communication or closing of the powder flow channel 13 and the channel 32.

[0034] In some embodiments, as shown in Figures 7 to 12As shown, the modular powder box mechanism 2 is installed on the bidirectional scraper mechanism 1, the bidirectional scraper mechanism 1 includes a scraper main body frame 3, a powder limiting piece 4 and a scraper assembly, the scraper main body frame 3 is provided with a mounting channel 5 penetrating through along the height direction of the scraper main body frame 3, the powder valve seat 28 is installed in the mounting channel 5, the powder limiting piece 4 is installed at the bottom of the scraper main body frame 3, the powder limiting piece 4 is provided with four powder channels 6 penetrating through along the height direction of the powder limiting piece 4, the four powder channels 6 correspond to the four channels 32 one by one, the two sides of the scraper main body frame 3 in the width direction are both provided with the scraper assembly, the scraper assembly includes a scraper adjusting piece 7, a scraper fixing piece 8 and a scraper strip 9, the scraper adjusting piece 7 is installed on the scraper main body frame 3, the scraper fixing piece 8 is connected to the side wall of the scraper adjusting piece 7, and the scraper strip 9 is installed at the bottom of the scraper fixing piece 8. The powder flowing out through the channel 32 enters the four powder channels 6 correspondingly, flows into the bottom surface of the forming chamber through the powder channel 6, and the whole left-right movement of the scraper device drives the movement of the scraper strip 9 to lay the powder. Since the two groups of scraper assemblies are provided, the bidirectional powder laying function is realized. The action process of the scraper strip 9 is: reset→the scraper strip 9 moves right→laser sintering printing→the scraper strip moves left→laser sintering printing→entering the cycle.

[0035] As shown in some embodiments, Figure 7 and Figure 8 As shown, the two sides of the scraper main body frame 3 are integrally formed with a rectangular table 14, the two ends of the rectangular table 14 are provided with a leveling assembly, the leveling assembly includes a micrometer head 15 and a tension spring 16, the scraper adjusting piece 7 is installed on the scraper main body frame 3 through a screw 17, the scraper adjusting piece 7 is located below the rectangular table 14, the two ends of the tension spring 16 are connected to the rectangular table 14 and the scraper adjusting piece 7 respectively, the micrometer head 15 is installed at the top of the rectangular table 14, the rectangular table 14 is provided with an adjusting hole 18 penetrating through, the telescopic head of the micrometer head 15 passes through the adjusting hole 18 and abuts against the scraper adjusting piece 7, the scraper adjusting piece 7 is leveled before being installed, the scraper adjusting piece 7 is initially installed on the scraper main body frame 3 through the screw 17, the screw 17 is in an untightened state, then the height of the two ends of the scraper adjusting piece 7 is measured by a measuring tool, the micrometer head 15 at the corresponding position is adjusted according to the height error, the telescopic head of the micrometer head 15 is lifted to cause the deflection of the scraper adjusting piece 7, the rectangular table 14 and the scraper adjusting piece 7 are pulled tightly by the action of the tension spring 16, after the leveling is completed, the screw 17 is tightened to lock the scraper adjusting piece 7 on the scraper main body frame 3, and the parallelism of the scraper assembly is ensured. It is worth noting that the size of the through hole provided on the scraper adjusting piece 7 for the screw 17 to pass through is larger than the size of the screw 17, so that there is a relative movement space between the screw 17 and the scraper adjusting piece 7 before the screw 17 is tightened, which facilitates the adjustment of the position of the scraper adjusting piece 7 to level it. After the screw 17 is tightened, the scraper adjusting piece 7 is abutted against the scraper main body frame 3, and the leveling installation of the scraper adjusting piece 7 is completed.

[0036] Further, the rectangular table 14 is provided with a tension spring hole 19, the side wall of the rectangular table 14 is threadedly connected with a tension spring screw 20, the tension spring screw 20 passes through the tension spring hole 19, the top of the doctor blade adjusting piece 7 is provided with a mounting hole 21, the side wall of the doctor blade adjusting piece 7 is provided with an open pin 22, the open pin 22 passes through the mounting hole 21, and the two ends of the tension spring 16 are respectively sleeved on the tension spring screw 20 and the open pin 22, so that the two ends of the tension spring 16 are detachably connected to the rectangular table 14 and the doctor blade adjusting piece 7, and the installation and dismounting are facilitated.

[0037] In some embodiments, as shown in Figures 7 to 12 The doctor blade fixing piece 8 comprises two half-type fixing pieces, the two half-type fixing pieces are arranged and connected along the width direction of the doctor blade body frame 3, the top of the doctor blade strip 9 is clamped between the two half-type fixing pieces, the two half-type fixing pieces are connected through fixing screws, the two half-type fixing pieces are conveniently connected and dismounted, the doctor blade strip 9 is conveniently replaced and installed, at least one protruding part 23 is integrally formed on the two sides of the doctor blade strip 9, the end face of the half-type fixing piece close to the doctor blade strip 9 is provided with a limiting groove 24, and the protruding part 23 is adapted in the limiting groove 24, so that the connecting strength between the doctor blade strip 9 and the doctor blade fixing piece 8 is enhanced, and the position of the doctor blade strip 9 does not change in the printing process.

[0038] In the description of the present application, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "central", "both ends" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application; and as known by those skilled in the art, the beneficial effects to be achieved by the present application are only better beneficial effects achieved in specific cases compared with the current implementation in the prior art, and are not intended to directly achieve the best use effect in the industry.

[0039] The above description is only the preferred embodiment of the present application, and it should be understood that the present application is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concepts described herein by the above-mentioned teaching or related art or knowledge. Any modification and change made by those skilled in the art without departing from the spirit and scope of the present application shall be within the protection scope of the claims of the present application.

Claims

1. A modular powder box for a 3D printer, comprising a modular powder box mechanism (2), characterized in that: The modular powder box mechanism (2) comprises a transparent powder box (10), a powder box connector (11), a powder valve seat (28) and a valve shaft (29). The transparent powder box (10) is internally provided with four isolated powder chambers (12) for storing powders of different elements. The powder box connector (11) is connected to the bottom of the transparent powder box (10). The positions of the powder box connector (11) corresponding to the four powder chambers (12) are all penetrated by a powder flow channel (13). The bottom of the powder chamber (12) is open for communicating with the powder flow channel (13). The powder valve seat (28) is connected to the bottom of the powder box connector (11). One end of the final valve seat (28) is provided with an axial hole (31) extending through it along its length direction, and the valve shaft (29) is interference-fitted in the axial hole (31). Four channels (32) are provided on the top of the powder valve seat (28) along the axial direction of the valve shaft (29), and the four channels (32) are connected to the four powder flow channels (13) in a one-to-one correspondence. Four valve shaft channels (30) are provided on the side wall of the valve shaft (29) along its axial direction, and the four valve shaft channels (30) are connected to the four channels (32) in a one-to-one correspondence. The valve shaft (29) is rotated to connect or close the powder flow channel (13) with the channel (32). The modular powder box mechanism (2) is mounted on a bidirectional scraper mechanism (1), and the bidirectional scraper mechanism (1) comprises a scraper main frame (3), a powder limiting member (4) and a scraper assembly. The scraper main frame (3) is provided with a mounting channel (5) along its own height direction, the powder valve seat (28) is mounted in the mounting channel (5), the powder limiting member (4) is mounted at the bottom of the scraper main frame (3), and the powder limiting member (4) is provided with four powder channels (6) along its own height direction. The four powder channels (6) correspond to the four channels (32) in a one-to-one manner. The scraper assembly is provided on both sides of the scraper main frame (3) in the width direction. The scraper assembly includes a scraper adjusting member (7), a scraper fixing member (8) and a scraper strip (9). The scraper adjusting member (7) is installed on the scraper main frame (3), the scraper fixing member (8) is connected to the side wall of the scraper adjusting member (7), and the scraper strip (9) is installed at the bottom of the scraper fixing member (8). The action flow of the scraper strip (9) is: reset → scraper strip (9) moves to the right → laser sintering printing → scraper strip (9) moves to the left → laser sintering printing → enters the cycle, thereby realizing two-way powder spreading.

2. The modular powder box for a 3D printer according to claim 1, characterized in that: A lower frame-shaped member (33) is fixed to the bottom of the transparent powder box (10), a boss (34) is formed on the inner wall of the powder box connecting member (11), the lower frame-shaped member (33) is adapted to be inside the powder box connecting member (11) and supported by the boss (34), the outer wall of the lower frame-shaped member (33) is in contact with the inner wall of the powder box connecting member (11), and a powder box screw (35) is passed through the side wall of the powder box connecting member (11), and the powder box screw (35) is threadedly connected to the lower frame-shaped member (33).

3. The modular powder box of a 3D printer according to claim 2, characterized in that: The size of the powder flow channel (13) gradually decreases in a direction approaching the powder valve seat (28), and the bottom size of the powder flow channel (13) is the same as the size of the channel (32).

4. The modular powder box for a 3D printer according to claim 3, characterized in that: A power assembly is provided at one end of the valve shaft (29), and the power assembly includes a power box (36) and a power steering gear (37). The power box (36) is installed at one end of the powder box connector (11). The power steering gear (37) is installed on the end surface of the power box (36) close to the powder valve seat (28). The output shaft of the power steering gear (37) is connected to one end of the valve shaft (29).

5. The modular powder box for a 3D printer according to claim 4, characterized in that: The power assembly further comprises a battery compartment (39), a battery mounting hole (38) is provided on the end surface of the power housing (36) away from the powder box connector (11), the battery compartment (39) is assembled in the battery mounting hole (38), a button battery (40) is arranged in the battery compartment (39), an end of the battery compartment (39) away from the powder box connector (11) is provided with an external thread, the battery mounting hole (38) is provided with an internal thread, the battery compartment (39) is threadedly adapted in the battery mounting hole (38), and the battery compartment (39) is used to supply power to the power servo (37).

6. The modular powder box for a 3D printer according to claim 1, characterized in that: Rectangular platforms (14) are integrally formed on both sides of the scraper main frame (3), and leveling components are provided at both ends of the rectangular platform (14). The leveling components include a micrometer head (15) and a tension spring (16). The scraper adjustment member (7) is mounted on the scraper main frame (3) by a screw (17). The scraper adjustment member (7) is located below the rectangular platform (14). The two ends of the tension spring (16) are respectively connected to the rectangular platform (14) and the scraper adjustment member (7). The micrometer head (15) is mounted on the top of the rectangular platform (14). An adjustment hole (18) is provided through the rectangular platform (14). The telescopic head of the micrometer head (15) passes through the adjustment hole (18) and abuts against the scraper adjustment member (7).

7. The modular powder box for a 3D printer according to claim 6, characterized in that: A tension spring hole (19) is formed through the rectangular platform (14), a tension spring screw (20) is threadedly connected to the side wall of the rectangular platform (14), and the tension spring screw (20) passes through the tension spring hole (19). A mounting hole (21) is formed on the top of the scraper adjustment member (7), and a cotter pin (22) is formed through the side wall of the scraper adjustment member (7), and the cotter pin (22) passes through the mounting hole (21). The two ends of the tension spring (16) are respectively sleeved on the tension spring screw (20) and the cotter pin (22).

8. The modular powder box for a 3D printer according to claim 7, characterized in that: The scraper fixing member (8) comprises two half-shaped fixing members, the two half-shaped fixing members are arranged and connected along the width direction of the scraper main body frame (3), and the top of the scraper strip (9) is clamped between the two half-shaped fixing members.

9. The modular powder box for a 3D printer according to claim 8, characterized in that: At least one protrusion (23) is integrally formed on both sides of the scraper strip (9), and a limiting groove (24) is provided on the end surface of the half-shaped fixing member close to the scraper strip (9), and the protrusion (23) is adapted to fit in the limiting groove (24).

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