Sliding mechanism of 3D printer and 3D printer

Abstract

The utility model provides a sliding mechanism of a 3D printer and the 3D printer. The sliding mechanism of the 3D printer is applied to a moving platform of the 3D printer. The sliding mechanism of the 3D printer comprises a shaft piece, a shaft sleeve and a sliding piece. The shaft piece extends in the first direction, and the two ends of the shaft piece are connected to the movable platform. The shaft sleeve is provided with a through hole, the shaft piece is inserted into the through hole in a penetrating mode and slides relative to the shaft sleeve, the through hole extends in the first direction, and a first radial gap exists between the outer surface of the shaft piece and the hole wall of the through hole; the sliding piece is used for being connected with a nozzle assembly and connected to the shaft sleeve so as to synchronously slide along with the shaft sleeve in the first direction. Therefore, according to the sliding mechanism of the 3D printer, the first radial gap is formed between the shaft sleeve and the shaft piece, and it is ensured that the shaft sleeve cannot be stuck when sliding along the shaft piece.

Description

Technical Field

[0001] The present application relates to the technical field of 3D printing, and in particular to a sliding mechanism of a 3D printer and a 3D printer. Background Art

[0002] The mobile platform of the 3D printer is provided with a sliding mechanism to drive the nozzle to move back and forth. The sliding mechanism is generally composed of an optical axis and a slider sliding along the optical axis. Part of the optical axis may be bent, causing the slider to get stuck in the bent part of the optical axis or causing the movement of the slider to deviate. Utility Model Content

[0003] The present application provides a sliding mechanism of a 3D printer and a 3D printer, so as to solve the problem in the known technology that a partial section of an optical axis is bent, causing a slider to get stuck or a movement deviation of the slider.

[0004] In a first aspect, the present application provides a sliding mechanism of a 3D printer, which is applied to a mobile platform of the 3D printer; the sliding mechanism of the 3D printer includes a shaft, a sleeve and a sliding member: the shaft extends along a first direction, and both ends are respectively connected to the mobile platform; the sleeve is provided with a through hole, the shaft is inserted into the through hole and slides relative to the sleeve, the through hole extends along the first direction, and a first radial gap exists between the outer surface of the shaft and the hole wall of the through hole; the sliding member is used to connect the nozzle assembly, and is connected to the sleeve to slide synchronously with the sleeve along the first direction.

[0005] In a possible implementation manner, the perforation is a first waist-shaped hole, and includes a first rectangular portion and two first semicircular portions;

[0006] Along the second direction, the two first semicircular portions are respectively connected to the two ends of the first rectangular portion and are connected to each other. The second direction is perpendicular to the first direction so that the first rectangular portion forms the first radial gap. The first radial gap allows the sleeve to move laterally along the second direction.

[0007] In a possible implementation manner, the width of the first rectangular portion is a1, the diameter of the first semicircular portion is d1, and a1 and d1 satisfy the relationship a1=d1.

[0008] In a possible implementation manner, the length of the first rectangular portion is b1, and b1 and a1 satisfy the relationship 1 / 12≤2b1 / a1≤1 / 10.

[0009] In a possible implementation, the sliding member is provided with a mounting hole, the mounting hole extends along the first direction and accommodates the shaft sleeve, and a second radial gap exists between a hole wall of the mounting hole and an outer surface of the shaft sleeve.

[0010] In a possible implementation manner, the mounting hole is a second waist-shaped hole, and includes a second rectangular portion and two second semicircular portions;

[0011] Along the third direction, the two second semicircular portions are respectively connected to the two ends of the second rectangular portion and are connected to each other. The third direction is perpendicular to the first direction and is parallel to or intersects with the second direction, so that the second rectangular portion forms the second radial gap, and the second radial gap allows the sleeve to move laterally along the third direction.

[0012] In a possible implementation, the width of the second rectangular portion is a2, the diameter of the second semicircular portion is d2, a2 ​​and d2 satisfy the relationship a2=d2, the length of the second rectangular portion is b2, b2 and a2 satisfy the relationship 1 / 12≤2b2 / a2≤1 / 10.

[0013] In a possible implementation, the sliding member is provided with a first limiting portion and a second limiting portion, and along the first direction, the first limiting portion and the second limiting portion are spaced apart, and the shaft sleeve is clamped between the first limiting portion and the second limiting portion.

[0014] In a second aspect, an embodiment of the present application further provides a 3D printer, comprising the mobile platform and the sliding mechanism of the above-mentioned 3D printer, wherein the sliding mechanism of the 3D printer is installed on the mobile platform.

[0015] In a possible implementation, the 3D printer further includes a guide mechanism and a connecting member, wherein the guide mechanism is arranged in parallel and at intervals on one side of the shaft, one end of the connecting member is connected to the guide mechanism, and the other end thereof is connected to the sliding member, and the nozzle assembly is connected to the connecting member.

[0016] In the sliding mechanism of the 3D printer of the present application, the sliding member is slidably connected to the shaft member through the shaft sleeve, and the friction between the shaft sleeve and the shaft member is smaller. Compared with the structure in which the sliding member is directly slidably connected to the shaft member, the friction between the sliding member and the shaft member is prevented from being too large, which may cause the sliding member to be stuck in the curved part of the shaft member. In addition, a first radial gap is provided between the shaft sleeve and the shaft member, so that the shaft sleeve can be offset radially relative to the shaft member, ensuring that the shaft sleeve will not be stuck when sliding along the shaft member, and further ensuring that the sliding member connected to the shaft sleeve will not be stuck. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1FIG. 1 is a three-dimensional schematic diagram of a sliding mechanism of a 3D printer of the present application in one embodiment.

[0018] Figure 2 FIG. 1 is a schematic diagram of the installation of the sliding mechanism of the 3D printer of the present application in one embodiment.

[0019] Figure 3 FIG. 1 is a schematic diagram of the structure of a 3D printer according to an embodiment of the present invention.

[0020] Figure 4 FIG. 1 is an exploded schematic diagram of a sliding mechanism of a 3D printer of the present application in one embodiment.

[0021] Figure 5 It is a schematic structural diagram of a sleeve in one embodiment of the sliding mechanism of the 3D printer of the present application.

[0022] Figure 6 FIG. 1 is a schematic structural diagram of a sliding member of a sliding mechanism of a 3D printer of the present application in one embodiment.

[0023] Figure 7 FIG. 1 is a front view schematic diagram of a sliding member of a sliding mechanism of a 3D printer of the present application in one embodiment.

[0024] Figure 8 for Figure 1 A schematic cross-sectional view of the sliding mechanism of the 3D printer along the VIII-VIII direction.

[0025] Fig. 9 FIG. 1 is a schematic diagram of the structure of a mobile platform of a 3D printer in one embodiment of the present application.

[0026] Description of main component symbols:

[0027] Sliding mechanism 100 for 3D printer

[0028] Shaft 10

[0029] Bushing 20

[0030] Piercing 21

[0031] The first semicircular portion 211

[0032] The first rectangular portion 212

[0033] Sliding member 30

[0034] The first limiting portion 301

[0035] The second limiting portion 302

[0036] Through hole 303

[0037] Mounting hole 31

[0038] The second semicircular portion 311

[0039] The second rectangular portion 312

[0040] First direction Y

[0041] Second direction X

[0042] The third direction Z

[0043] First semicircular hole wall P1

[0044] First straight hole wall P2

[0045] Second semicircular hole wall P3

[0046] Second straight hole wall P4

[0047] 3D Printer 200

[0048] Mobile Platform 210

[0049] Nozzle assembly 220

[0050] Body 230

[0051] Guide mechanism 240

[0052] Guide shaft 241

[0053] Guide bushing 242

[0054] Guide slide 243

[0055] Connector 250

[0056] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0057] The following description will refer to the accompanying drawings to more fully describe the content of the present application. Shown in the accompanying drawings are exemplary embodiments of the present application. However, the present application can be implemented in many different forms and should not be construed as being limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make the present application thorough and complete, and to fully convey the scope of the present application to those skilled in the art. Similar reference numerals represent identical or similar components.

[0058] The terms used herein are only used for the purpose of describing specific exemplary embodiments and are not intended to limit the present application. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to also include the plural forms. In addition, when used herein, "including" and / or "comprising" and / or "having", integers, steps, operations, components and / or components, but do not exclude the existence or addition of one or more other features, regions, integers, steps, operations, components and / or groups thereof.

[0059] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs. In addition, unless explicitly defined herein, terms such as those defined in general dictionaries should be interpreted as having a meaning consistent with their meaning in the relevant technology and the content of this application, and will not be interpreted as an idealized or overly formal meaning.

[0060] The specific implementation methods of the present application are further described in detail below with reference to the accompanying drawings.

[0061] like Figures 1 to 3 As shown, an embodiment of the present application provides a sliding mechanism 100 of a 3D printer, which is applied to a moving platform 210 of a 3D printer 200 .

[0062] The 3D printer 200 includes a mobile platform 210, a body 230, a nozzle assembly 220, and a sliding mechanism 100 of the 3D printer. The body 230 may be configured with a driving assembly and a molding platform, and the mobile platform 210 is connected to one end of the body 230. The sliding mechanism 100 of the 3D printer may be slidably mounted on the mobile platform 210, and the nozzle assembly 220 is connected to the sliding mechanism 100 of the 3D printer to move relative to the molding platform along the first direction Y or the second direction X along with the sliding mechanism 100 of the 3D printer. The first direction Y and the second direction X are two directions perpendicular to each other in a horizontal plane.

[0063] The sliding mechanism 100 of the 3D printer includes a shaft 10, a sleeve 20 and a sliding member 30. The shaft 10 is a cylindrical optical axis and extends along a first direction Y. Both ends of the shaft 10 along the first direction Y are respectively connected to a moving platform 210, and a space is left between the middle part of the shaft 10 and the moving platform 210 for the sliding member 30 to move.

[0064] The sleeve 20 is provided with a through hole 21, and the shaft 10 is inserted into the through hole 21 and slides relative to the sleeve 20. The through hole 21 extends along the first direction Y, and a first radial gap exists between the outer surface of the shaft 10 and the hole wall of the through hole 21. The first radial gap allows the sleeve 20 to deviate in the radial direction relative to the shaft 10, so as to ensure that the sleeve 20 can deviate in the radial direction without getting stuck when passing through the curved section of the shaft 10. The radial direction of the shaft 10 is parallel to the second direction X.

[0065] In particular, the sleeve 20 is made of a material with a low friction coefficient such as graphite, which can reduce the friction between the sleeve 20 and the shaft 10, so that the sleeve 20 will not generate too much friction when passing through the curved section of the shaft 10, causing the sleeve 20 to get stuck.

[0066] The sliding member 30 is used to connect the nozzle assembly 220 to carry the nozzle assembly 220 to slide synchronously. The sliding member 30 is connected to the shaft sleeve 20 to slide synchronously with the shaft sleeve 20 along the first direction Y.

[0067] Thus, in the sliding mechanism 100 of the 3D printer of the present application, the sliding member 30 is slidably connected to the shaft member 10 through the shaft sleeve 20, and the friction between the shaft sleeve 20 and the shaft member 10 is smaller. Compared with the structure in which the sliding member 30 is directly slidably connected to the shaft member 10, it is avoided that the friction between the sliding member 30 and the shaft member 10 is too large, causing the sliding member 30 to be stuck in the curved part of the shaft member 10. In addition, a first radial gap is provided between the shaft sleeve 20 and the shaft member 10, so that the shaft sleeve 20 can be offset radially relative to the shaft member 10, ensuring that the shaft sleeve 20 will not be stuck when sliding along the shaft member 10, and further ensuring that the sliding member 30 connected to the shaft sleeve 20 will not be stuck.

[0068] Please combine again Figure 4 and Figure 5 In one embodiment, the through hole 21 is a first waist-shaped hole and includes a first rectangular portion 212 and two first semicircular portions 211. The first rectangular portion 212 is rectangular in shape, and the first semicircular portion 211 is semicircular in shape.

[0069] Along the second direction X, the two first semicircular portions 211 are respectively connected to the two ends of the first rectangular portion 212 and are connected to each other, and a first radial gap is formed by the first rectangular portion 212. The first rectangular portion 212 allows the sleeve 20 to move laterally therein along the second direction X, so that when the sleeve 20 slides through the curved section of the shaft 10, the sleeve 20 can be offset relative to the shaft 10 along the second direction X to avoid the sleeve 20 being stuck in the curved section of the shaft 10.

[0070] It is understandable that, in addition to the first waist-shaped hole mentioned above, the shape of the perforation 21 can also be other shapes, such as an arch shape, etc. The specific shape of the perforation 21 can be adaptively adjusted according to actual design requirements.

[0071] Please combine again Figure 4 and Figure 5 In one embodiment, the width of the first rectangular portion 212 is a1, the diameter of the first semicircular portion 211 is d1, and a1 and d1 satisfy the relationship a1=d1, so that the tangents passing through the end points of the two ends of the first semicircular portion 211 coincide with the length sides of the first rectangular portion 212 respectively.

[0072] The first semicircular portion 211 has a first semicircular hole wall P1, and the first rectangular portion 212 has two first straight hole walls P2, and the two first straight hole walls P2 are respectively the length sides of the first rectangular portion 212, so that the first semicircular hole walls P1 of the two first semicircular portions 211 and the two first straight hole walls P2 of the first rectangular portion 212 are connected to form the hole wall of the through hole 21.

[0073] Thus, when the shaft member 10 is partially received in the sleeve 20 , the section of the shaft member 10 received in the sleeve 20 can just abut against the first semicircular hole wall P1 or the first linear hole wall P2 .

[0074] Please combine again Figure 4 and Figure 5 In one embodiment, the length of the first rectangular portion 212 is b1, and b1 and a1 satisfy the relationship 1 / 12≤2b1 / a1≤1 / 10. The ratio range of the length and width of the first rectangular portion 212 satisfies the above relationship, so that the first rectangular portion 212 has a certain length to allow the sleeve 20 to deviate along the second direction X, and can also prevent the first rectangular portion 212 from being too long, resulting in excessive shaking of the sleeve 20 along the second direction X when sliding along the shaft 10.

[0075] It is understandable that the ratio range of the length to the width of the first rectangular portion 212 may be other ratio ranges besides the above 1 / 12 to 1 / 10, and the ratio range may be adaptively adjusted according to actual design requirements.

[0076] Please combine again Figure 6 and Figure 7 In one embodiment, the sliding member 30 is provided with a mounting hole 31 extending along the first direction Y and receiving the shaft sleeve 20 . A second radial gap exists between the hole wall of the mounting hole 31 and the outer surface of the shaft sleeve 20 .

[0077] The second radial gap allows radial offset between the sleeve 20 and the sliding member 30. In addition, the existence of the gap forms a space between the sliding member 30 and the shaft member 10 for the sleeve 20 to move, so as to ensure that when the sleeve 20 passes through the curved section of the shaft member 10, the sleeve 20 moves in the space to allow the sliding member 30 to avoid the curved section of the shaft member 10, thereby preventing the sliding member 30 from getting stuck in the curved section of the shaft member 10.

[0078] Please combine again Figure 6 and Figure 7 , and see Figure 4 In one embodiment, the mounting hole 31 is a second waist-shaped hole, which has substantially the same shape as the first waist-shaped hole and includes a second rectangular portion 312 and two second semicircular portions 311 .

[0079] Along the third direction Z, the two second semicircular portions 311 are respectively connected to the two ends of the second rectangular portion 312 and are connected to each other. The third direction Z is perpendicular to the first direction Y and is parallel to or intersects with the second direction X, so that the second rectangular portion 312 forms a second radial gap. The second rectangular portion 312 allows the sliding member 30 to move laterally along the third direction Z.

[0080] Preferably, the third direction Z is parallel to the second direction X, so that the first radial gap and the second radial gap extend in the same direction, so that the sliding member 30 has a larger movable space for displacement, thereby improving the sliding member 30's avoidance effect on the curved section of the shaft member 10.

[0081] It is understandable that the third direction Z may also intersect with the second direction X, that is, the extension direction of the first radial gap and the second radial gap are set at an angle, so that the sliding member 30 is better adaptable to the shaft member 10 and can be well adapted to the curved sections of the shaft member 10 that bend in different directions.

[0082] It is worth noting that, in addition to being the second waist-shaped hole mentioned above, the shape of the mounting hole 31 can also be other shapes, such as an arch shape, etc. The specific shape of the mounting hole 31 can be adaptively adjusted according to actual design requirements.

[0083] Please combine again Figure 6 and Figure 7 , and see Figure 4 In one embodiment, the width of the second rectangular portion 312 is a2, the diameter of the second semicircular portion 311 is d2, a2 ​​and d2 satisfy the relationship a2=d2, the length of the second rectangular portion 312 is b2, b2 and a2 satisfy the relationship 1 / 12≤2b2 / a2≤1 / 10.

[0084] The second semicircular portion 311 has a second semicircular hole wall P3, and the second rectangular portion 312 has two second straight hole walls P4. The two second straight hole walls P4 are respectively the length sides of the second rectangular portion 312, so that the second semicircular hole walls P3 of the two second semicircular portions 311 and the two second straight hole walls P4 of the second rectangular portion 312 are connected to form the hole wall of the mounting hole 31.

[0085] Thus, when the sleeve 20 is received in the mounting hole 31 , the sleeve 20 can just abut against the second semicircular hole wall P3 or the second linear hole wall P4 .

[0086] The ratio range of the length and width of the second rectangular portion 312 satisfies the above relationship, which can ensure that the second rectangular portion 312 has a certain length to allow the sliding member 30 to shift along the third direction Z, and can also avoid the second rectangular portion 312 being too long, resulting in excessive shaking of the sliding member 30 along the third direction Z when sliding along the shaft 10.

[0087] It is understandable that the ratio range of the length to the width of the second rectangular portion 312 may be other ratio ranges besides the above 1 / 12 to 1 / 10, and the ratio range may be adaptively adjusted according to actual design requirements.

[0088] Please combine again Figure 8 , and see Figure 4 and Figure 6 In one embodiment, the sliding member 30 is provided with a first limiting portion 301 and a second limiting portion 302. Along the first direction Y, the first limiting portion 301 and the second limiting portion 302 are arranged at intervals, and the sleeve 20 is clamped between the first limiting portion 301 and the second limiting portion 302, so that the sleeve 20 is positioned in the sliding member 30 in the first direction Y, ensuring that the sliding member 30 and the sleeve 20 can move synchronously along the first direction Y.

[0089] Specifically, the first limiting portion 301 is a limiting protrusion, which protrudes radially inward from the hole wall at one end of the mounting hole 31 along the first direction Y, and is arranged in an annular structure. The first limiting portion 301 is surrounded by a through hole 303, and the hole diameter of the through hole 303 is smaller than the outer diameter of the sleeve 20 and larger than the outer diameter of the shaft member 10, so that one end of the sleeve 20 along the first direction Y is abutted against the first limiting portion 301. In addition, the through hole 303 is for the shaft member 10 to pass through.

[0090] The second limiting portion 302 is a bolt or a screw, etc., and is located at the other end of the mounting hole 31 along the second direction X. The small end of the second limiting portion 302 is fixed in the sliding member 30, and the circle where the large end of the second limiting portion 302 is located intersects with the circle where the mounting hole 31 is located, so that the other end of the sleeve 20 along the first direction Y abuts against the large end of the second limiting portion 302, thereby clamping the sleeve 20 between the first limiting portion 301 and the second limiting portion 302.

[0091] The second limiting portion 302 is a bolt or a screw, etc., so that the shaft sleeve 20 can be taken out after the second limiting portion 302 is removed, thereby facilitating the disassembly and assembly of the shaft sleeve 20 .

[0092] It is understandable that the first limiting portion 301 and the second limiting portion 302 may also be bolts or screws.

[0093] like Fig. 9As shown, the embodiment of the present application further provides a 3D printer 200, which includes a guide mechanism 240 and a connector 250. The guide mechanism 240 is arranged parallel to and spaced apart from one side of the shaft member 10, and is mounted on the mobile platform 210. The connector 250 is a shaft or a rod, one end of the connector 250 is connected to the guide mechanism 240, and the other end is connected to the sliding member 30. The nozzle assembly 220 is connected to the connector 250 to slide along the first direction Y with the connector 250.

[0094] The guide mechanism 240 includes a guide shaft 241, a guide sleeve 242 and a guide slide 243. The guide shaft 241 is arranged parallel to the shaft 10, and the connecting member 250 is arranged perpendicular to the shaft 10. One end of the connecting member 250 is connected to the slide 30, and the other end thereof is connected to the guide slide 243.

[0095] When some embodiments are adopted, the guide shaft 241 , the guide sleeve 242 and the guide sliding member 243 have the same structure and connection relationship as the sliding mechanism 100 of the above-mentioned 3D printer, and will not be described in detail.

[0096] When other embodiments are adopted, the guide shaft 241, the guide sleeve 242 and the guide sliding member 243 are different from the sliding mechanism 100 of the above-mentioned 3D printer in that the matching holes of the guide shaft 241 and the guide sleeve 242 are round holes, and the matching holes of the guide sleeve 242 and the guide sliding member 243 are also round holes. In addition to the above differences, the other structures and connection relationships of the guide shaft 241, the guide sleeve 242 and the guide sliding member 243 are the same as those of the sliding mechanism 100 of the above-mentioned 3D printer, and will not be repeated.

[0097] Furthermore, in this embodiment, the sliding mechanism 100 of the 3D printer has a preset gap, and the guide mechanism 240 is normally assembled, so that the connecting member 250 can be adaptively adjusted after radial sliding during the sliding process to avoid the connecting member 250 from getting stuck.

[0098] Please combine again Fig. 9 In one embodiment, the 3D printer 200 includes two 3D printer sliding mechanisms 100 and two guide mechanisms 240 .

[0099] The two shaft members 10 are arranged perpendicular to each other, and accordingly, the two guide shaft members 241 are arranged perpendicular to each other, and the two connecting members 250 are arranged perpendicular to each other and are located in horizontal planes at different heights. The nozzle assembly 220 is connected to the two connecting members 250 at the same time to enable the nozzle assembly 220 to slide along the first direction Y or the second direction X.

[0100] In this way, since the 3D printer 200 has the sliding mechanism 100 of the above-mentioned 3D printer, the first radial gap and the second radial gap set in the sliding mechanism 100 of the 3D printer can meet the radial offset requirement of the sliding member 30 relative to the shaft member 10, thereby preventing the sliding member 30 from getting stuck when sliding along the shaft member 10, thereby improving the stability of the 3D printer 200 during operation.

[0101] In the above, the specific embodiments of the present application are described with reference to the accompanying drawings. However, those skilled in the art will appreciate that various changes and substitutions may be made to the specific embodiments of the present application without departing from the scope of the present application. These changes and substitutions are all within the scope defined by the present application.

Claims

1. A sliding mechanism of a 3D printer, applied to a mobile platform of a 3D printer; characterized in that: The sliding mechanism of the 3D printer comprises: A shaft member extending along a first direction, with two ends respectively connected to the moving platform; A shaft sleeve, wherein the shaft sleeve is provided with a through hole, the shaft member is inserted into the through hole and slides relative to the shaft sleeve, the through hole extends along the first direction, and a first radial gap exists between the outer surface of the shaft member and the hole wall of the through hole; The sliding member is used for connecting the nozzle assembly and is connected to the shaft sleeve so as to slide synchronously with the shaft sleeve along the first direction.

2. The sliding mechanism of the 3D printer according to claim 1, characterized in that: The perforation is a first waist-shaped hole and includes a first rectangular portion and two first semicircular portions; Along the second direction, the two first semicircular portions are respectively connected to the two ends of the first rectangular portion and are connected to each other. The second direction is perpendicular to the first direction so that the first rectangular portion forms the first radial gap. The first radial gap allows the sleeve to move laterally along the second direction.

3. The sliding mechanism of the 3D printer according to claim 2, characterized in that: The width of the first rectangular portion is a1, the diameter of the first semicircular portion is d1, and a1 and d1 satisfy the relationship a1=d1.

4. The sliding mechanism of the 3D printer according to claim 3, characterized in that: The length of the first rectangular portion is b1, and b1 and a1 satisfy the relationship 1 / 12≤2b1 / a1≤1 / 10.

5. The sliding mechanism of the 3D printer according to claim 1, characterized in that: The sliding member is provided with a mounting hole, the mounting hole extends along the first direction and accommodates the shaft sleeve, and a second radial gap exists between the hole wall of the mounting hole and the outer surface of the shaft sleeve.

6. The sliding mechanism of the 3D printer according to claim 5, characterized in that: The mounting hole is a second waist-shaped hole and includes a second rectangular portion and two second semicircular portions; Along the third direction, the two second semicircular portions are respectively connected to the two ends of the second rectangular portion and are connected to each other. The third direction is perpendicular to the first direction and parallel to or intersecting with the second direction, so that the second rectangular portion forms the second radial gap, and the second radial gap allows the sliding part to move laterally along the third direction.

7. The sliding mechanism of the 3D printer according to claim 6, characterized in that: The width of the second rectangular portion is a2, the diameter of the second semicircular portion is d2, a2 ​​and d2 satisfy the relationship a2=d2, the length of the second rectangular portion is b2, b2 and a2 satisfy the relationship 1 / 12≤2b2 / a2≤1 / 10.

8. The sliding mechanism of the 3D printer according to claim 5, characterized in that: The sliding member is provided with a first limiting portion and a second limiting portion. Along the first direction, the first limiting portion and the second limiting portion are spaced apart from each other, and the shaft sleeve is clamped between the first limiting portion and the second limiting portion.

9. A 3D printer, characterized in that: The invention comprises the mobile platform and the sliding mechanism of the 3D printer as claimed in any one of claims 1 to 8, wherein the sliding mechanism of the 3D printer is installed on the mobile platform.

10. The 3D printer according to claim 9, characterized in that: The 3D printer further comprises a guide mechanism and a connecting member, wherein the guide mechanism is arranged parallel to and spaced apart from one side of the shaft member, one end of the connecting member is connected to the guide mechanism, and the other end thereof is connected to the sliding member, and the nozzle assembly is connected to the connecting member.

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