Printing platform lifting mechanism of miniature 3D printer

Abstract

The utility model discloses a lifting mechanism for a printing platform of a miniature 3D printer, and the printing platform of the lifting mechanism for the printing platform of the miniature 3D printer comprises a working part, a connecting part, two groups of side shaft sleeves, a middle shaft sleeve and a magnetic flexible plate, so that the printing platform has good stability and balance; the printing platform can be effectively prevented from inclining or shaking, the printing precision is improved, lifting of the printing platform can be achieved by controlling the rotating speed and the direction of the servo motor, the highest position and the lowest position of the printing platform can be controlled through the limiting switch, and therefore accurate lifting of the printing platform is achieved, and the printing efficiency is improved. According to the printing platform lifting mechanism of the miniature 3D printer, detachable design is adopted for connecting parts of the lifting mechanism, the lead screw and the positioning shaft rod, the manufacturing process of the printing platform is simplified, the manufacturing cost of the printing platform is reduced, and the side shaft sleeve and the center shaft sleeve of special structures are adopted, so that the stability of the printing platform during lifting is improved while installation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printers, in particular to a printing platform lifting mechanism for a micro 3D printer. Background Art

[0002] Micro 3D printers are small, lightweight, and easy-to-use 3D printing devices that can be used at home, in schools, and in maker spaces to meet the creative needs of individuals and small teams. Micro 3D printers usually use fused deposition modeling (FDM) technology, which heats and extrudes thermoplastic materials to stack them layer by layer into the desired three-dimensional shape.

[0003] At present, the common micro 3D printer printing platform lifting mechanisms on the market mainly include the following types:

[0004] 1. Four-corner fixed type: This type of printing platform lifting mechanism uses four screws fixed on the four corners of the printing platform, and the motor drives the screws to rotate to achieve the lifting of the printing platform. This type of printing platform lifting mechanism has a simple structure, but has the following disadvantages: First, the stability of the printing platform is poor, and it is easy to tilt or shake, affecting the printing accuracy; second, the adjustment of the printing platform is complicated, and the height of the four screws needs to be adjusted at the same time, which is time-consuming and labor-intensive; third, the printing platform occupies a large space, which is not conducive to miniaturization design;

[0005] 2. Center-fixed type: This type of printing platform lifting mechanism uses a screw fixed at the center of the printing platform, and the motor drives the screw to rotate to achieve the lifting of the printing platform. This type of printing platform lifting mechanism has a compact structure, but has the following disadvantages: First, the printing platform has a weak carrying capacity and can only carry lighter printing materials and printed products, which is not suitable for large or heavy printing needs; second, the printing platform has poor balance and is prone to tilt or deformation, affecting printing accuracy; third, the printing platform is difficult to adjust, and the height of the screw needs to be adjusted frequently to ensure the appropriate distance between the printing platform and the nozzle;

[0006] 3. Side fixed type: This type of printing platform lifting mechanism uses two screws fixed on both sides of the printing platform, and the motor drives the screws to rotate to achieve the lifting of the printing platform. This type of printing platform lifting mechanism has a reasonable structure, but it has the following disadvantages: First, the installation of the printing platform is complicated, and the positions of the two screws need to be accurately aligned to ensure the horizontality of the printing platform; second, the adjustment of the printing platform is not flexible, and it can only achieve overall lifting and lowering, and cannot achieve local adjustment, which is not suitable for printing needs in different areas; third, the replacement of the printing platform is inconvenient, and the two screws need to be disassembled to replace the printing platform, which is not conducive to the rapid switching of printing materials or printed products.

[0007] In addition, the existing printing platform needs to be provided with an internal threaded hole and a positioning hole for connecting the screw rod and the positioning rod, which indirectly increases the production cost of the printing platform and reduces the production efficiency.

[0008] To sum up, the existing 3D printer printing platform lifting mechanism has problems such as complex structure, poor stability, difficult adjustment, inconvenient replacement, and high cost. There is an urgent need for a micro 3D printer printing platform lifting mechanism with simple structure, good stability, flexible adjustment, convenient replacement, and reduced cost to meet different printing needs and improve printing efficiency and quality. Utility Model Content

[0009] The purpose of the utility model is to provide a micro 3D printer printing platform lifting mechanism to solve the problems existing in the existing 3D printer printing platform mentioned in the above background technology.

[0010] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a micro 3D printer printing platform lifting mechanism, comprising a lower mounting platform, an upper mounting platform and a printing platform;

[0011] Two groups of positioning shaft rods are fixedly connected between the lower mounting platform and the upper mounting platform, and the two groups of positioning shaft rods are arranged vertically and in parallel. A servo motor is installed at the bottom of the lower mounting platform, and a screw rod is fixedly connected to the motor shaft of the servo motor;

[0012] A limit switch is installed at the lower end of the upper mounting platform, and a bearing is fixedly embedded in the upper mounting platform, and the top of the screw rod is fixed in the inner ring of the bearing;

[0013] The printing platform is movably arranged between the lower mounting platform and the upper mounting platform, two sets of side shaft grooves are opened in the top and bottom of the printing platform, and a middle groove is opened in the top of the printing platform. The printing platform includes a working part, a connecting part, two sets of side shaft sleeves, a middle shaft sleeve and a magnetic flexible plate, wherein:

[0014] A placement slot is provided in the top of the working part;

[0015] The connecting portion is integrally connected to the top rear edge of the working portion;

[0016] Two sets of side bushings are integrally connected to the top of the connecting portion;

[0017] The middle bushing is integrally connected to the top of the connecting portion, and the middle bushing is arranged between the two sets of side bushings;

[0018] Two sets of side shaft grooves are respectively opened in two sets of side shaft sleeves;

[0019] The middle groove is formed in the middle sleeve;

[0020] The magnetic flexible plate is magnetically connected to the placement slot;

[0021] A positioning sleeve is connected in the side shaft groove, and the positioning shaft rod is connected to the inner side of the positioning sleeve with clearance fit;

[0022] A transmission sleeve is connected in the middle groove, and the surface of the screw rod is connected to the inner side of the transmission sleeve through a threaded structure.

[0023] Preferably, a disassembly groove is provided in the bottom of the working portion, the specification of the disassembly groove is smaller than the specifications of the magnetic flexible plate and the placement groove, and the disassembly groove is connected to the placement groove.

[0024] Preferably, a height-adjusting bolt is inserted and connected in the top of the connecting portion through a threaded structure, and the height-adjusting bolt contacts the limit switch through lifting and lowering.

[0025] Preferably, the side shaft groove includes a first main groove and a first auxiliary groove, the positioning sleeve is an annular structure, the outer diameter length of the positioning sleeve is adapted to the inner diameter length of the first main groove, and a first clamping bolt is connected to the first auxiliary groove through a threaded structure, and the head of the first clamping bolt is tightly pressed against the surface of the positioning sleeve.

[0026] Preferably, the middle groove includes a second main groove and two groups of second auxiliary grooves, the transmission sleeve is an external hexagonal prism structure, and the transmission sleeve is matched and connected in the second main groove, and the second auxiliary groove is connected with a second clamping bolt through a threaded structure, and the heads of the two groups of the second clamping bolts are tightly pressed on the top of the transmission sleeve.

[0027] Preferably, the top edges on both sides of the placement groove are integrally connected with circular edges.

[0028] Preferably, two groups of clamping holes are opened through the magnetic flexible plate, and two groups of threaded base holes are opened through the working part. Positioning bolts are connected to the threaded base holes, and the upper ends of the positioning bolts are connected to the inner sides of the clamping holes.

[0029] Compared with the prior art, the beneficial effects of the utility model are:

[0030] 1. The printing platform of the micro 3D printer printing platform lifting mechanism includes a working part, a connecting part, two sets of side sleeves, an intermediate sleeve and a magnetic flexible plate, wherein the working part is used to carry printing materials and printed products, the connecting part is used to connect the working part and the side sleeves and the intermediate sleeves, the side sleeves are used to cooperate with the positioning shaft rod, the intermediate sleeves are used to cooperate with the lead screw, and the magnetic flexible plate is used to be magnetically connected to the placement groove in the working part. This structure enables the printing platform to have good stability and balance, can effectively prevent the printing platform from tilting or shaking, and improve the printing accuracy;

[0031] 2. The lifting of the printing platform of the micro 3D printer printing platform lifting mechanism can be achieved by controlling the speed and direction of the servo motor, and the highest and lowest positions of the printing platform can be controlled by the limit switch, thereby achieving accurate lifting of the printing platform and improving printing efficiency;

[0032] 3. The connection parts between the lifting mechanism of the printing platform of the micro 3D printer and the screw rod and the positioning shaft rod are detachable, which simplifies the manufacturing process of the printing platform and reduces the manufacturing cost of the printing platform. The side sleeve and the center sleeve of the special structure are adopted, which are easy to install and improve the stability of the printing platform when it is lifted;

[0033] 4. The micro 3D printer printing platform lifting mechanism adopts a convenient printing platform replacement mechanism. This structure allows the replacement of the printing platform to be achieved through the following steps: first, unscrew the positioning bolt from the card hole to separate the magnetic flexible board from the working part; second, take the magnetic flexible board out of the placement slot and remove it from the printing platform through the disassembly slot; third, insert the new magnetic flexible board into the printing platform through the disassembly slot so that it is magnetically connected to the placement slot; fourth, pass the positioning bolt through the threaded base hole so that its upper end is connected to the inner side of the card hole to fix the magnetic flexible board to the working part. This structure makes the replacement of the printing platform quick and simple, without the need to disassemble the screw rod or positioning shaft rod, does not affect the lifting and adjustment of the printing platform, and improves printing efficiency and convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is an axonometric diagram of a lifting mechanism for a printing platform of a micro 3D printer of the utility model;

[0035] Figure 2 This is another axonometric diagram of the lifting mechanism of the printing platform of a micro 3D printer of the utility model;

[0036] Figure 3 This is a top view of the printing platform of the printing platform lifting mechanism of a micro 3D printer of the utility model;

[0037] Figure 4 This is a schematic diagram of the structure of a micro 3D printer printing platform lifting mechanism after the printing platform is installed with a positioning sleeve and a transmission sleeve;

[0038] Figure 5 This is a perspective view of the printing platform of a micro 3D printer printing platform lifting mechanism of the utility model;

[0039] Figure 6 This is a schematic diagram of the side sleeve structure of a lifting mechanism of a printing platform of a micro 3D printer of the utility model;

[0040] Figure 7This is a schematic diagram of the structure of the middle sleeve of the lifting mechanism of the printing platform of a micro 3D printer of the utility model;

[0041] Figure 8 This is a front isometric view of a printing platform of a printing platform lifting mechanism of a micro 3D printer of the utility model;

[0042] Fig. 9 This is a schematic diagram of the positioning bolt structure of a lifting mechanism of a printing platform of a micro 3D printer of the utility model.

[0043] In the figure:

[0044] 1. Lower mounting platform; 2. Upper mounting platform; 3. Printing platform;

[0045] 31. working part; 311. placement groove; 3111. return edge;

[0046] 312, disassembly groove; 313, threaded base hole; 314, positioning bolt;

[0047] 32. Connecting part; 33. Side bushing; 34. Intermediate bushing;

[0048] 35, side shaft groove; 351, positioning sleeve; 352, first main groove;

[0049] 353, first auxiliary groove; 354, first clamping bolt; 36, middle groove;

[0050] 361, transmission sleeve; 362, second main groove; 363, second auxiliary groove;

[0051] 364, second tightening bolt; 37, magnetic flexible plate; 371, clamping hole;

[0052] 38. Heightening bolt; 4. Positioning shaft; 5. Limit switch;

[0053] 6. Servo motor; 7. Screw; 8. Bearing. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0055] In the description of the utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0056] In the description of the utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0057] See also Figure 1-9 The utility model provides a technical solution: a micro 3D printer printing platform lifting mechanism, including a lower mounting platform 1, an upper mounting platform 2 and a printing platform 3.

[0058] Two sets of positioning shaft rods 4 are fixedly connected between the lower mounting platform 1 and the upper mounting platform 2. The two sets of positioning shaft rods 4 are vertically and parallelly arranged. A servo motor 6 is installed at the bottom of the lower mounting platform 1. The motor shaft of the servo motor 6 is fixedly connected with a screw rod 7.

[0059] A limit switch 5 is installed at the lower end of the upper mounting platform 2 , and a bearing 8 is fixedly embedded in the upper mounting platform 2 , and the top of the screw rod 7 is fixed in the inner ring of the bearing 8 .

[0060] The printing platform 3 is movably arranged between the lower mounting platform 1 and the upper mounting platform 2. Two sets of side shaft grooves 35 are provided in the top and bottom of the printing platform 3, and a middle groove 36 is provided in the top of the printing platform 3. The printing platform 3 includes a working portion 31, a connecting portion 32, two sets of side shaft sleeves 33, a middle shaft sleeve 34 and a magnetic flexible plate 37, wherein:

[0061] A placement groove 311 is provided in the top of the working portion 31;

[0062] The connecting portion 32 is integrally connected to the top rear edge of the working portion 31;

[0063] Two sets of side sleeves 33 are integrally connected to the top of the connecting portion 32;

[0064] The middle bushing 34 is integrally connected to the top of the connecting portion 32, and the middle bushing 34 is disposed between the two sets of side bushings 33;

[0065] Two sets of side shaft grooves 35 are respectively opened in the two sets of side shaft sleeves 33;

[0066] The middle groove 36 is formed in the middle sleeve 34;

[0067] The magnetically attracted flexible plate 37 is magnetically connected to the placement groove 311 .

[0068] A positioning sleeve 351 is connected in the side shaft groove 35 , and the positioning shaft rod 4 is inserted and connected to the inner side of the positioning sleeve 351 with clearance fit.

[0069] A transmission sleeve 361 is connected in the middle groove 36 , and the surface of the screw rod 7 is inserted and connected to the inner side of the transmission sleeve 361 through a threaded structure.

[0070] Specifically, the working part 31, the connecting part 32, the two groups of side sleeves 33, and the middle sleeve 34 are integrally formed, wherein the working part 31 is used to carry printing materials and printed products, the connecting part 32 is used to connect the working part 31 and the two groups of side sleeves 33 and the middle sleeve 34, the side sleeve 33 is used to cooperate with the positioning shaft 4, the middle sleeve 34 is used to cooperate with the lead screw 7, and the magnetic flexible plate 37 is used to be magnetically connected to the placement groove 311 in the working part 31. This structure enables the printing platform to have good stability and balance, can effectively prevent the printing platform from tilting or shaking, and improve printing accuracy.

[0071] Specifically, the lifting and lowering of the printing platform 3 can be achieved by controlling the rotation speed and direction of the servo motor 6 .

[0072] A disassembly slot 312 is provided in the bottom of the working portion 31. The size of the disassembly slot 312 is smaller than that of the magnetic flexible board 37 and the placement slot 311, and the disassembly slot 312 is connected to the placement slot 311. Specifically, the magnetic flexible board 37 is used as a printing bearing platform, and the magnetic flexible board 37 can be easily replaced through the disassembly slot 312, thereby improving printing efficiency and convenience.

[0073] A height adjustment bolt 38 is inserted and connected in the top of the connection part 32 through a threaded structure, and the height adjustment bolt 38 contacts the limit switch 5 through lifting. Specifically, an internal threaded hole for the height adjustment bolt 38 to connect is provided in the top of the connection part 32, and the height adjustment bolt 38 can be adjusted by rotating its connection position in the connection part 32, thereby adjusting the highest lifting position of the printing platform 3. The limit switch 5 and the servo motor 6 are electrically connected through a wire, so that when the height adjustment bolt 38 is connected to the limit switch 5, the servo motor 6 stops running, thereby realizing the limit of the printing platform 3.

[0074] The side shaft groove 35 includes a first main groove 352 and a first auxiliary groove 353. The positioning sleeve 351 is an annular structure. The outer diameter length of the positioning sleeve 351 is adapted to the inner diameter length of the first main groove 352. The first auxiliary groove 353 is connected with a first pressing bolt 354 through a threaded structure. The head of the first pressing bolt 354 is pressed against the surface of the positioning sleeve 351. Specifically, the positioning sleeve 351 and the printing platform 3 are detachably designed. The positioning sleeve 351 can be produced by batch injection molding or 3D printing. Batch production effectively reduces costs. The head of the first pressing bolt 354 extends into the first main groove 352 during installation, so that the positioning sleeve 351 can be directly placed in the first main groove 352 during installation, and then the positioning sleeve 351 is fastened by the first pressing bolt 354. The disassembly and assembly are simple, and the replacement is convenient, which enhances the stability and balance of the printing platform and improves the printing accuracy and safety.

[0075] The middle groove 36 includes a second main groove 362 and two groups of second auxiliary grooves 363. The transmission sleeve 361 is an external hexagonal prism structure, and the transmission sleeve 361 is matched and connected in the second main groove 362. The second auxiliary groove 363 is connected with a second clamping bolt 364 through a threaded structure, and the heads of the two groups of second clamping bolts 364 are tightly pressed on the top of the transmission sleeve 361. Specifically, the transmission sleeve 361 and the printing platform 3 are also detachable in design. Similar to the positioning sleeve 351, the positioning sleeve 351 can be produced by batch injection molding or 3D printing. Batch production effectively reduces costs. In addition, since the transmission sleeve 361 and the positioning sleeve 351 are both easily worn parts, the use of an easily disassembled structure effectively reduces maintenance costs and avoids the overall replacement of the printing platform. The transmission sleeve 361 with an external hexagonal prism structure effectively improves stability. The head of the second clamping bolt 364 extends into the second main groove 362 during installation, so that the transmission sleeve 361 can be directly placed in the second main groove 362 during installation, and then the transmission sleeve 361 is fastened by two sets of second clamping bolts 364. When the transmission sleeve 361 is excessively worn, it can be disassembled and replaced. This mechanism enhances the bearing capacity and transmission effect of the printing platform 3, and improves printing efficiency and quality.

[0076] The top edges of both sides of the placement groove 311 are integrally connected with a return edge 3111. Specifically, the return edge 3111 has a top limit function for the magnetic flexible board 37, further improving the stability of the magnetic flexible board 37 during installation.

[0077] Two groups of clamping holes 371 are formed through the magnetic flexible plate 37 , and two groups of threaded base holes 313 are formed through the working portion 31 . Positioning bolts 314 are connected to the threaded base holes 313 , and the upper ends of the positioning bolts 314 are connected to the inner sides of the clamping holes 371 .

[0078] Specifically, a convenient printing platform 3 replacement mechanism is adopted, so that the replacement of the printing platform 3 can be achieved through the following steps: first, the positioning bolt 314 is unscrewed from the clamping hole 371 to separate the magnetic flexible plate 37 from the working part 31; second, the magnetic flexible plate 37 is taken out from the placement groove 311 and removed from the printing platform 3 through the disassembly groove 312; third, a new magnetic flexible plate 37 is inserted into the printing platform 3 through the disassembly groove 312 so that it is magnetically connected to the placement groove 311; fourth, the positioning bolt 314 is passed through the threaded base hole 313 so that its upper end is connected to the inner side of the clamping hole 371, so that the magnetic flexible plate 37 is fixed to the working part 31. This structure makes the replacement of the magnetic flexible plate 37 quick and simple, without the need to disassemble the screw rod 7 or the positioning shaft rod 4, without affecting the lifting and adjustment of the printing platform 3, and improving printing efficiency and convenience.

[0079] Specifically, the upper end of the positioning bolt 314 is a conical structure, which is convenient for guiding and inserting into the locking hole 371.

[0080] Specifically, according to actual work requirements, multiple groups of magnetic flexible plates 37 can be stacked up and down and installed on the top of the working part 31 to adjust the printing height in turn.

[0081] Specifically, after printing, the magnetic flexible plate 37 and the printed product can be taken out simultaneously, and the printed product support portion attached to the magnetic flexible plate 37 can be detached by bending the magnetic flexible plate 37, so as to realize quick material retrieval of the printed product.

[0082] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A micro 3D printer printing platform lifting mechanism, characterized in that: It comprises a lower mounting platform (1), an upper mounting platform (2) and a printing platform (3); Two groups of positioning shaft rods (4) are fixedly connected between the lower mounting platform (1) and the upper mounting platform (2), and the two groups of positioning shaft rods (4) are arranged vertically and in parallel. A servo motor (6) is installed at the bottom of the lower mounting platform (1), and a screw rod (7) is fixedly connected to the motor shaft of the servo motor (6); A limit switch (5) is installed at the lower end of the upper mounting platform (2), and a bearing (8) is fixedly embedded in the upper mounting platform (2), and the top of the screw rod (7) is fixed in the inner ring of the bearing (8); The printing platform (3) is movably arranged between the lower mounting platform (1) and the upper mounting platform (2), two groups of side shaft grooves (35) are provided in the top and bottom of the printing platform (3), and a middle groove (36) is provided in the top of the printing platform (3), and the printing platform (3) comprises a working part (31), a connecting part (32), two groups of side shaft sleeves (33), a middle shaft sleeve (34) and a magnetic flexible plate (37), wherein: A placement groove (311) is provided in the top of the working part (31); The connecting portion (32) is integrally connected to the top rear edge of the working portion (31); Two sets of side sleeves (33) are integrally connected to the top of the connecting portion (32); The middle shaft sleeve (34) is integrally connected to the top of the connecting portion (32), and the middle shaft sleeve (34) is arranged between the two sets of side shaft sleeves (33); Two groups of side shaft grooves (35) are respectively formed in the two groups of side shaft sleeves (33); The middle groove (36) is formed in the middle sleeve (34); The magnetically attracted flexible plate (37) is magnetically connected to the placement groove (311); A positioning sleeve (351) is connected inside the side shaft groove (35), and the positioning shaft rod (4) is connected to the inner side of the positioning sleeve (351) with clearance fit; A transmission sleeve (361) is connected inside the middle groove (36), and the surface of the screw rod (7) is connected to the inner side of the transmission sleeve (361) through a threaded structure.

2. A micro 3D printer printing platform lifting mechanism according to claim 1, characterized in that: A disassembly groove (312) is provided in the bottom of the working portion (31), the specification of the disassembly groove (312) is smaller than the specifications of the magnetic flexible plate (37) and the placement groove (311), and the disassembly groove (312) is connected to the placement groove (311).

3. A micro 3D printer printing platform lifting mechanism according to claim 1, characterized in that: A height adjustment bolt (38) is inserted and connected in the top of the connecting portion (32) via a threaded structure, and the height adjustment bolt (38) contacts the limit switch (5) by lifting and lowering.

4. A micro 3D printer printing platform lifting mechanism according to claim 1, characterized in that: The side shaft groove (35) includes a first main groove (352) and a first auxiliary groove (353); the positioning sleeve (351) is an annular structure; the outer diameter length of the positioning sleeve (351) is matched with the inner diameter length of the first main groove (352); a first clamping bolt (354) is connected to the first auxiliary groove (353) via a threaded structure; the head of the first clamping bolt (354) is tightly pressed against the surface of the positioning sleeve (351).

5. The micro 3D printer printing platform lifting mechanism according to claim 1, characterized in that: The intermediate groove (36) comprises a second main groove (362) and two groups of second auxiliary grooves (363); the transmission sleeve (361) is an outer hexagonal prism structure, and the transmission sleeve (361) is matched and connected in the second main groove (362); the second auxiliary groove (363) is connected with a second clamping bolt (364) through a threaded structure, and the heads of the two groups of the second clamping bolts (364) are tightly pressed on the top of the transmission sleeve (361).

6. A micro 3D printer printing platform lifting mechanism according to claim 1, characterized in that: The top edges of both sides of the placement groove (311) are integrally connected with return edges (3111).

7. The micro 3D printer printing platform lifting mechanism according to claim 1, characterized in that: The magnetic flexible plate (37) is provided with two groups of clamping holes (371) extending therethrough, and the working portion (31) is provided with two groups of threaded base holes (313) extending therethrough. Positioning bolts (314) are connected to the threaded base holes (313), and the upper ends of the positioning bolts (314) are connected to the inner sides of the clamping holes (371).

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