Hot bed and 3D printer

Abstract

The utility model discloses a hot bed and a 3D printer, and relates to the technical field of 3D printing, the hot bed comprises a printing platform, a support frame and a locking assembly, the printing platform is provided with a printing plane used for bearing a printing piece; the supporting frame is arranged on the side, back to the printing plane, of the printing platform, the supporting frame and the printing platform are arranged at intervals in the first direction and elastically connected through an elastic piece, and the first direction is perpendicular to the printing plane; the locking assembly is arranged on the printing platform and provided with a friction face abutting against the supporting frame, the friction face is parallel to the first direction, friction force parallel to the first direction exists between the friction face and the supporting frame, and the friction force is used for limiting relative movement of the printing platform and the supporting frame in the first direction. According to the technical scheme, the connecting structure of the hot bed is simplified, and the leveling efficiency of the hot bed is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to 3D printing technical field, especially a kind of hot bed and 3D printer. BACKGROUND

[0002] 3D printer is a kind of process equipment of rapid prototyping. When 3D printer prints, hot melt filament material is supplied to printing head by feeding mechanism, hot melt filament material is heated to molten state in printing head, and moves according to the printing path of three-dimensional printer, while extruding the material in molten state on printing platform, to print three-dimensional object in the way of layering.

[0003] However, the relative displacement of printing platform and printing head in vertical direction may not be in the preset range, therefore, before printing, the printing platform needs to be leveled to ensure that the printing head can move relative to the printing platform along the printing path, to improve the printing accuracy of 3D printer. At present, printing platform and support frame are usually fixed in vertical direction by screw or bolt, and the height of printing plane is adjusted by repeatedly screwing or bolting screw or bolt during leveling, which is very inconvenient. SUMMARY

[0004] The main purpose of the utility model is to provide a kind of hot bed and 3D printer, to simplify the connecting structure of hot bed, improve the leveling efficiency of hot bed.

[0005] To achieve the above purpose, the utility model provides a kind of hot bed, the hot bed includes:

[0006] Printing platform, the printing platform is provided with printing plane, for carrying printing piece;

[0007] Support frame, the support frame is arranged on the side of the printing platform away from the printing plane, the support frame and the printing platform are spaced apart along the first direction, and are elastically connected by elastic member, and the first direction is perpendicular to the printing plane;And

[0008] Locking assembly, the locking assembly is arranged on the printing platform, the locking assembly has friction surface abutting against the support frame, the friction surface is arranged in parallel with the first direction, and the friction surface and the support frame have friction force parallel to the first direction, and the friction force is used to limit the relative movement of the printing platform and the support frame in the first direction.

[0009] In an embodiment, the locking assembly includes connecting piece and fastener, the connecting piece is arranged on the printing platform;

[0010] The connecting piece has a first surface abutting against the support frame, the first surface is the friction surface, and the fastener is used to adjust the relative position of the first surface and the support frame in the first direction.

[0011] In an embodiment, the connecting piece is provided with a connecting hole, the fastener comprises a connecting part and an abutting part, the abutting part is connected to one end of the connecting part, the support frame is provided with a sliding hole, the other end of the connecting part penetrates through the sliding hole and is connected to the connecting hole, the abutting part is provided with a second surface, the second surface abuts against the support frame, and the second surface is also the friction surface.

[0012] In an embodiment, the connecting piece comprises a first part and a second part connected at an included angle, the first part is connected to a surface of the printing platform away from the printing plane, the second part is arranged parallel to the first direction and is provided with the first surface and the connecting hole.

[0013] In an embodiment, the first part is provided with a limiting groove, the support frame is provided with a limiting protrusion, one end of the elastic piece is limited in the limiting groove, and the other end of the elastic piece is sleeved on the limiting protrusion.

[0014] In an embodiment, the sliding hole is arranged in extension along the first direction, the diameter of the connecting part is consistent with the width of the sliding hole, and the direction of the width is arranged vertically to the first direction.

[0015] And / or, the diameter of the connecting part is consistent with the hole diameter of the connecting hole.

[0016] In an embodiment, the locking assembly comprises a plurality of, and the elastic piece also comprises a plurality of, each of the elastic pieces is arranged close to one of the locking assemblies, and the elastic force direction of the elastic piece is arranged parallel to the first direction.

[0017] In an embodiment, the projection of the printing platform perpendicular to the first direction is arranged in a quadrilateral shape and has four corner portions, the locking assembly comprises four, and each of the locking assemblies is arranged corresponding to one of the corner portions.

[0018] In an embodiment, the printing platform is provided with a fixed position and at least two mounting positions, the printing platform is rotationally connected with the support frame at the fixed position, and the printing platform is provided with one of the locking assemblies at each of the mounting positions.

[0019] The utility model also proposes a 3D printer, the 3D printer includes printing head mechanism and the hot bed as described above, the printing head mechanism is suitable for pressing the printing platform to carry out leveling to the printing plane.

[0020] The technical scheme of the utility model discloses that printing platform and support frame are arranged along the first direction interval, and the printing platform is used for bearing the printing piece, and the support frame is used for supporting the printing platform and is installed on the side of the printing platform away from the printing plane. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the structure shown in these drawings without creative labor.

[0022] Figure 1 The structure schematic diagram of the hot bed in an embodiment provided by the utility model is shown in the figure.

[0023] Figure 2 The structure schematic diagram of the hot bed in an embodiment provided by the utility model is shown in the figure. Figure 1 The partial enlarged view of A in the figure.

[0024] Figure 3 The structure schematic diagram of the hot bed in an embodiment provided by the utility model is shown in the figure.

[0025] Figure 4 The structure schematic diagram of the connecting piece in an embodiment provided by the utility model is shown in the figure.

[0026] Figure 5 The structure schematic diagram of the hot bed in an embodiment provided by the utility model is shown in the figure.

[0027] Figure 6 The structure schematic diagram of the hot bed in an embodiment provided by the utility model is shown in the figure. Figure 5 The partial enlarged view of B in the figure.

[0028] Figure 7 An exploded structural diagram of the heated bed from another perspective in another embodiment of this utility model;

[0029] Figure 8 for Figure 7 A magnified view of a section at point C.

[0030] Explanation of icon numbers:

[0031] 100. Heated bed; 1. Printing platform; 11. Printing plane; 12. Corner; 13. Fixing position; 14. Mounting position; 2. Support frame; 21. Extension; 211. First abutting surface; 212. Second abutting surface; 213. Sliding hole; 22. Limiting protrusion; 3. Elastic element; 4. Locking assembly; 41. Connector; 411. First part; 4111. Limiting groove; 412. Second part; 4121. First surface; 4122. Connecting hole; 42. Fastener; 421. Connecting part; 422. Abutting part; 4221. Second surface; 43. Friction surface.

[0032] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0034] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0035] In addition, if the description of "first", "second" and the like is involved in the embodiments of the utility model, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the utility model.

[0036] Please refer to Figures 1 to 8 The utility model provides a hot bed 100, hot bed 100 includes printing platform 1, support frame 2 and locking assembly 4, printing platform 1 is equipped with printing plane 11, is used for carrying printing piece, support frame 2 is located printing platform 1 back to the side of printing plane 11, support frame 2 is spaced apart with printing platform 1 along first direction, and is elastically connected through elastic part 3, and first direction is perpendicular to printing plane 11, locking assembly 4 is set up in printing platform 1, locking assembly 4 has the friction surface 43 of abutment with support frame 2, and friction surface 43 is parallel to first direction arrangement, and the friction force between friction surface 43 and support frame 2 is parallel to first direction, and the friction force is used to limit the relative movement of printing platform 1 and support frame 2 in first direction. Wherein, elastic part 3 can be spring, and first direction can be the thickness direction of hot bed, i.e. Figure 1 Z axis direction in.

[0037] In the embodiment, the printing plane 11 is used to carry the printing object and provide a placement basis for the printing object. The printing platform 1 can also heat the printing object to prevent the printing object from warping due to thermal expansion and contraction during printing, thereby affecting the printing quality. The support frame 2 is used to support the printing platform 1 and is installed on the side of the printing platform 1 away from the printing plane 11. It can be understood that during leveling, the position of the printing plane 11 relative to the nozzle is leveled to keep the distance between the printing plane 11 and the nozzle consistent in the first direction, which is perpendicular to the printing plane 11. Therefore, the printing platform 1 and the support frame 2 are spaced apart in the first direction and are elastically connected by the elastic member 3. In this way, the support frame 2 and the printing platform 1 have a relative movement degree of freedom in the first direction, and the leveling of the printing plane 11 can be achieved by changing the relative distance between the positions of the printing platform 1 and the support frame 2 in the first direction. The locking assembly 4 is arranged on the printing platform 1 and is provided with a friction surface 43 abutting against the support frame 2. After leveling is completed, the locking assembly 4 can limit the relative movement of the printing plane 11 and the support frame 2 by the friction force between the friction surface 43 and the support frame 2, so as to avoid the relative movement of the printing platform 1 and the support frame 2 after leveling is completed. In the embodiment, only the printing platform 1 and the support frame 2 are fixed by the locking assembly 4 to simplify the connection structure of the printing platform 1 and the support frame 2. During leveling, the printing plane 11 can be directly pressed down, thereby improving the leveling efficiency.

[0038] It can be understood that the elastic member 3 can carry the printing platform 1, and under the action of the gravity of the printing platform 1, the elastic member 3 is deformed under the pressure of the printing platform 1. The maximum static friction force between the friction surface 43 and the support frame 2 can be adjusted and set. Before leveling, the maximum static friction force can be adjusted to be small or even zero to facilitate the relative movement of the printing platform 1 and the support frame 2 in the first direction.

[0039] In actual implementation, the printing plane 11 can correspond to the upper surface of the printing platform 1, and the support frame 2 is located below the printing platform 1. In leveling, the nozzle selects a point on the printing plane 11 as a reference point, confirms the distance between the nozzle and the reference point in the first direction, and then the nozzle successively presses at least two other points on the printing plane 11 to the position flush with the reference point, so that the distance between the nozzle and the two points in the first direction is consistent with the distance between the nozzle and the reference point in the first direction, and thus the leveling of the printing plane 11 is completed, wherein the reference point and the at least two pressed points are not arranged in a straight line. After leveling is completed, the maximum static friction between the adjustable friction surface 43 and the support frame 2 can be adjusted to lock the printing platform 1 and the support frame, thereby ensuring that the printing plane 11 always maintains a leveled state during printing and ensuring printing quality. Since the printing platform 1 needs to overcome the maximum static friction and the elastic force of the elastic member 3 to move downward when the nozzle presses the printing platform 1, reducing the maximum static friction between the friction surface 43 and the support frame 2 before leveling can reduce the resistance of the printing platform 1 to move downward, so as to avoid excessive force between the nozzle and the printing platform 1, which can damage the nozzle or the printing platform 1.

[0040] Optionally, before leveling, the maximum static friction between the friction surface 43 and the support frame 2 can be adjusted to always be not less than the difference between the elastic force of the elastic member 3 and the gravity of the printing platform 1. In the absence of external force, the friction is static friction, and the printing platform 1 remains in a static balance state under the action of gravity, the elastic force of the elastic member 3 and the friction of the support member on the friction surface 43. In this way, when the nozzle does not press the printing plane 11, the printing platform 1 is in a static state to assist leveling and reduce the possibility of relative movement between the printing platform 1 and the support frame 2 during leveling, thereby avoiding affecting the leveling accuracy.

[0041] In fact, the locking assembly 4 can also limit the relative movement between the support frame 2 and the printing platform 1 in the second direction by abutting the friction surface 43 and the support frame 2. The second direction is perpendicular to the first direction, the first direction is the Z-axis direction, and the second direction can be the X-axis direction, the Y-axis direction or other directions perpendicular to the Z-axis direction. The side of the support frame 2 away from the printing platform 1 is also provided with a mounting structure for connecting the driving member, which is not limited here.

[0042] In an embodiment of the present application, as shown in Figure 1 、 Figure 2 、 Figure 5 and Figure 6As shown, the locking assembly 4 comprises a connecting piece 41 and a fastener 42, the connecting piece 41 is arranged on the printing platform 1; the connecting piece 41 has a first surface 4121 abutting against the support frame 2, the first surface 4121 is a friction surface 43, and the fastener 42 is used for adjusting the relative position of the first surface 4121 and the support frame 2 in the first direction. Wherein, the fastener 42 can be a cross screw, a straight screw, or a torx screw.

[0043] In the embodiment, the first surface 4121 of the connecting piece 41 serves as the friction surface 43 and abuts against the support frame 2, and the first surface 4121 and the support frame 2 can generate a friction force in the first direction. The fastener 42 is used for fixing the connecting piece 41 and the support frame 2, and can fold the connecting piece 41 and the support frame 2, so that the connecting piece 41 and the support frame 2 abut against each other, a normal pressure is generated between the first surface 4121 and the support frame 2, and then the friction force between the first surface 4121 and the support frame 2 can be generated. By adjusting the fastening degree of the fastener 42, the normal pressure generated between the first surface 4121 and the support frame 2 can be changed, and then the maximum static friction between the first surface 4121 and the support frame 2 can be adjusted, so as to adjust the relative position of the first surface 4121 and the support frame 2 in the first direction during leveling.

[0044] In actual implementation, as shown in the drawings, Figures 5 to 8 The first surface 4121 is arranged parallel to the first direction, the support frame 2 comprises an extension 21 parallel to the first direction, the extension 21 has a first abutting surface 211 abutting against the first surface 4121, and the fastener 42 can relatively press the connecting piece 41 and the extension 21, so that the first surface 4121 and the first abutting surface 211 abut against each other to generate a normal pressure, and then the friction force between the first surface 4121 and the first abutting surface 211 parallel to the first direction can be generated. The fastener 42 can be a clamp with adjustable tightness, by relatively clamping the connecting piece 41 and the extension 21, the mutual abutment of the first surface 4121 and the first abutting surface 211 is realized, the tighter the clamp clamps, the greater the normal pressure between the first surface 4121 and the first abutting surface 211, and the greater the maximum static friction between the first surface 4121 and the first abutting surface 211, the looser the clamp clamps, the smaller the normal pressure between the first surface 4121 and the first abutting surface 211, and the smaller the maximum static friction between the first surface 4121 and the first abutting surface 211, so as to realize the adjustment of the maximum static friction between the friction surface 43 of the locking assembly 4 and the support frame 2.

[0045] In an embodiment of the utility model, as shown in the drawings, Figures 5 to 8As shown, the connecting piece 41 is provided with a connecting hole 4122, the fastener 42 includes a connecting part 421 and an abutting part 422, the abutting part 422 is connected to one end of the connecting part 421, the support frame 2 is provided with a sliding hole 213, the other end of the connecting part 421 penetrates the sliding hole 213 and is connected to the connecting hole 4122, the abutting part 422 is provided with a second surface 4221, the second surface 4221 abuts against the support frame 2, and the second surface 4221 is also a friction surface 43.

[0046] In the embodiment, the abutting part 422 and the connecting piece 41 are located at different sides of the support frame 2 respectively, the abutting part 422 is connected to one end of the connecting part 421, the other end of the connecting part 421 penetrates the sliding hole 213 of the support frame 2 and is connected to the connecting hole 4122 of the connecting piece 41, at the same time, the first surface 4121 of the connecting piece 41 and the second surface 4221 of the abutting part 422 abut against the support frame 2 from different sides, wherein the first surface 4121 and the second surface 4221 are both friction surfaces 43, by adjusting the tightness of the connection between the connecting part 421 and the connecting piece 41, the normal pressure between the connecting piece 41 and the support frame 2 and between the abutting part 422 and the support frame 2 can be changed, and then the maximum static friction between the friction surfaces 43 and the support frame 2 is adjusted. At the same time, the connecting part 421 is suitable for sliding in the sliding hole 213, and the sliding hole 213 plays a role of avoiding the position of the connecting part 421 when the printing platform 1 and the support frame 2 slide relatively, so as to avoid that the fastener 42 hinders the relative sliding of the printing platform 1 and the support frame 2.

[0047] In actual implementation, the support frame 2 has an extension 21 parallel to the first direction, the sliding hole 213 is arranged on the extension 21, and the extension 21 has a first abutting surface 211 and a second abutting surface 212 facing away from each other, which abut against the first surface 4121 and the second surface 4221 respectively. Optionally, the connecting hole 4122 and the connecting part 421 can be connected through threaded cooperation, by tightening or loosening the fastener 42, the normal pressure between the connecting piece 41 and the support frame 2 and between the abutting part 422 and the support frame 2 can be increased or decreased, and then the maximum static friction between the friction surfaces 43 and the support frame 2 is increased or decreased. Optionally, the connecting hole 4122 can also be arranged as a through hole, and the connecting part 421 is connected to the support frame 2 through a nut after penetrating the connecting hole 4122, so that the fastener 42 can also connect the connecting piece 41 and the support frame 2. Optionally, the fastener 42 can be a bolt or a screw, the connecting part 421 is a screw rod, and the abutting part 422 is a nut. The connecting direction of the connecting part 421 can be arranged along the second direction.

[0048] It can be understood that the first surface 4121 and the first abutting surface 211 and the second surface 4221 and the second abutting surface 212 are arranged in parallel with each other, and are arranged in parallel with the first direction, so that the friction surface 43 can not hinder the relative sliding of the printing platform 1 and the support frame 2 in the first direction in structure in addition to being able to generate a friction force parallel to the first direction with the support frame 2. At the same time, the first surface 4121 and the first abutting surface 211 and the second surface 4221 and the second abutting surface 212 can limit the printing platform 1 and the support frame 2 in the second direction, and the second direction is perpendicular to the first direction, and the first direction is the Z-axis direction, and the second direction can be the X-axis direction, the Y-axis direction and other directions perpendicular to the Z-axis direction, and the second direction in which the first surface 4121 and the first abutting surface 211 limit each other can be the same or different, for example, the second direction in which the first surface 4121 and the first abutting surface 211 limit each other is the X-axis direction, and the second direction in which the second surface 4221 and the second abutting surface 212 limit each other is another direction at an angle of 30° or 45° with the X-axis direction, wherein the two second directions are not perpendicular to each other, and the connecting direction of the fastener 42 is arranged in parallel with the second direction in which the second surface 4221 and the second abutting surface 212 limit each other, so that the printing platform 1 and the support frame 2 can be limited in the X-axis direction and the Y-axis direction, and relative displacement of the printing platform 1 and the support frame 2 in other directions except the first direction is avoided. The X-axis, the Y-axis and the Z-axis are shown in Figure 1

[0049] In an embodiment of the present application, as shown in Figures 5 to 8 The connecting piece 41 includes a first part 411 and a second part 412 connected at an angle, the first part 411 is connected to one side of the printing platform 1 away from the printing plane 11, and the second part 412 is arranged in parallel with the first direction and is provided with a first surface 4121 and a connecting hole 4122.

[0050] In this embodiment, the first part 411 is connected to the printing platform 1 to increase the connection area of the connecting piece 41 and the printing platform 1 and improve the stability of the connection of the connecting piece 41 and the printing platform 1. The second part 412 is provided with the first surface 4121 abutting against the support frame 2 and the connecting hole 4122 connected with the connecting part 421 for connection with the fastener 42. The second part 412 is arranged in parallel with the first direction to facilitate the formation of the first surface 4121 parallel to the first direction, and the first surface 4121 is suitable for relative movement with the support frame 2 along the first direction while abutting against the support frame 2.

[0051] ​In actual implementation, the connecting piece 41 can be provided in an L-shaped manner, the first portion 411 and the second portion 412 are provided vertically, the second portion 412 is located at the inner side of the extension 21, and the first portion 411 is provided on the side of the printing platform 1 which is away from the printing plane 11, so as to be attached to the printing platform 1 and improve the stability of the connection between the connecting piece 41 and the printing platform 1. Alternatively, the first portion 411 and the first platform can be connected in a detachable manner such as screw connection or bolt connection. The first portion 411 and the first platform can also be integrally formed.

[0052] In an embodiment of the present application, as shown in Figures 1 to 4 The first portion 411 is provided with a limiting groove 4111, the support frame 2 is provided with a limiting protrusion 22, one end of the elastic piece 3 is limited in the limiting groove 4111, and the other end of the elastic piece 3 is sleeved on the limiting protrusion 22.

[0053] In the embodiment, one end of the elastic piece 3 is connected to the support frame 2 by being sleeved on the limiting protrusion 22, the other end of the elastic piece 3 is connected to the first portion 411 by being limited in the limiting groove 4111, and the connection between the elastic piece 3 and the printing platform 1 is indirectly realized. It can be understood that the elastic piece 3 can be a spring, one end of the elastic piece 3 is located in the limiting groove 4111 and abuts against the groove wall of the limiting groove 4111, the elastic piece 3 cannot move in the limiting groove 4111, the other end of the elastic piece 3 is sleeved on the limiting protrusion 22 and abuts against the side wall of the limiting protrusion 22, the elastic piece 3 cannot move relative to the limiting protrusion 22, and thus the stability of the setting position of the elastic piece 3 can be ensured.

[0054] In actual implementation, the first portion 411 can be provided with the limiting protrusion 22, the support frame 2 can be provided with the limiting groove 4111, the first portion 411 can be provided with the limiting protrusion 22 and the support frame 2 can also be provided with the limiting protrusion 22, or the first portion 411 can be provided with the limiting groove 4111 and the support frame 2 can also be provided with the limiting groove 4111, which is not limited here.

[0055] In an embodiment of the present application, as shown in Figures 5 to 8 The sliding hole 213 is provided in extension along the first direction, the diameter of the connecting portion 421 is consistent with the width of the sliding hole 213, the width direction is perpendicular to the first direction, and / or the diameter of the connecting portion 421 is consistent with the hole diameter of the connecting hole 4122.

[0056] In the embodiment, the sliding hole 213 is arranged to extend along the first direction, and when the printing platform 1 and the support frame 2 slide relative to each other along the first direction, the connecting portion 421 also moves relative to the support frame 2 along the sliding hole 213. The diameter of the connecting portion 421 is consistent with the width of the sliding hole 213, so that the connecting portion 421 and the sliding hole 213 can be limited in the third direction, which is perpendicular to the first direction and the second direction in which the second abutting surface 212 and the second surface 4221 are limited. In this way, the printing platform 1 and the support frame 2 can be fixedly connected in directions other than the first direction. The diameter of the connecting portion 421 is consistent with the diameter of the connecting hole 4122, so that when the connecting portion 421 is connected to the connecting hole 4122, the relative position of the connecting portion 421 and the connecting hole 4122 remains unchanged, and the fastener 42 moves with the printing platform 1.

[0057] In actual implementation, the sliding hole 213 can also be arranged on the connecting piece 41, the connecting hole 4122 is arranged on the extension portion 21 of the support frame 2, the connecting portion 421 of the fastener 42 is arranged in the sliding hole 213 and is installed in the connecting hole 4122, and the abutting portion 422 and the extension portion 21 abut against the connecting piece 41 from both sides of the connecting piece 41. When the printing platform 1 is leveled, the printing platform 1 moves relative to the support frame 2 and the fastener 42 along the first direction at the same time.

[0058] In an embodiment of the utility model, as shown in Figures 5 to 8 The locking assembly 4 includes a plurality of elastic members 3, and each elastic member 3 is arranged close to a locking assembly 4. The elastic force direction of the elastic member 3 is parallel to the first direction.

[0059] In the embodiment, the locking assembly 4 and the elastic member 3 are arranged one by one, so that when leveling, the position of the printhead corresponding to the locking assembly 4 and the elastic member 3 can be pressed down to the printing plane 11, that is, the pressing position of the printhead overlaps the projection of the elastic member 3 perpendicular to the first direction, so as to improve the stability of the printing platform 1 when being pressed down by the printhead. In addition, the elastic force direction of the elastic member 3 is arranged along the first direction, so as to ensure that when the printing platform 1 and the support frame 2 move relative to each other along the first direction, the elastic member 3 deforms along the first direction, thereby improving the stability of the elastic member 3 supporting the printing platform 1.

[0060] It can be understood that the interval of the printing platform 1 and the support frame 2 along the first direction is relatively small compared with the overall size of the heat bed 100, and the sizes of the elastic member 3 and the locking assembly 4 are also set to be relatively small in the embodiment, and the multiple pressing positions of the nozzle are usually spaced far apart during leveling to ensure the leveling degree of the entire printing plane 11, and when the nozzle presses the printing platform 1 at a pressing position along the first direction, the printing platform 1 is actually hardly moved at other pressing positions. Therefore, a set of locking assemblies 4 is arranged at each pressing position of the printing platform 1, and the movement of the printing platform 1 at each pressing position can be controlled individually. Before leveling, the locking assembly 4 corresponding to each pressing position can reduce or zero the maximum static friction between the friction surface 43 and the support member, and then the nozzle presses the printing platform 1 at the pressing positions in sequence, and after the printing platform 1 at a pressing position is pressed in place, the maximum static friction between the friction surface 43 of the locking assembly 4 corresponding to the pressing position and the support frame 2 is increased, and thus the printing platform 1 and the support frame 2 corresponding to each pressing position are leveled and locked in sequence, which can improve the leveling accuracy. A plurality of elastic members 3 can be arranged near each set of locking assemblies 4 to ensure the stability of the movement of the printing platform 1 along the first direction corresponding to each pressing position when the nozzle presses the printing platform 1 at the pressing positions in sequence. Alternatively, the elastic member 3 and the pressing position can be arranged in one-to-many.

[0061] In actual implementation, the plurality of elastic members 3 arranged between the printing platform 1 and the support frame 2 can ensure the stability when the printing platform 1 is carried, and the plurality of locking assemblies 4 arranged on the printing platform 1 can ensure the reliability and stability when the printing platform 1 and the support frame 2 are locked.

[0062] In actual implementation, the elastic member 3 is arranged between the first part 411 of the connecting member 41 and the support frame 2, so that in the projection perpendicular to the first direction, the pressing position can be arranged in overlap with the connecting member 41 and the elastic member 3, so that when the nozzle presses the printing platform 1 at the pressing position, the elastic member 3 and the locking assembly 4 are actually pressed together, thereby improving the smoothness of the movement of the printing platform 1 at the pressing position.

[0063] In an embodiment of the utility model, as shown in Figures 1 to 3 The projection of the printing platform 1 perpendicular to the first direction is quadrilateral, and has four corners 12, and the locking assembly 4 includes four, and each locking assembly 4 is arranged corresponding to a corner 12.

[0064] In the embodiment, the pressing positions of the printing platform 1 are actually the four corners 12 of the printing platform 1, so that the accuracy and reliability of the leveling of the printing plane 11 can be ensured. Correspondingly, the four corners 12 of the printing platform 1 are correspondingly provided with the locking assemblies 4, and after each corner 12 is pressed into position during leveling, the corner 12 can be locked by the locking assembly 4, so that the four corners 12 are leveled and locked in sequence. The elastic members 3 can also be correspondingly provided with the corners 12.

[0065] It can be understood that before leveling, the maximum static friction between the friction surface 43 of each locking assembly 4 and the support frame 2 can be zeroed, so that the printing platform 1 is naturally placed on the elastic member 3, and then the maximum static friction between the friction surface 43 and the support frame 2 can be slightly increased, so that it is always not less than the difference between the elastic force of the elastic member 3 and the gravity of the printing platform 1, to assist leveling. During leveling, a reference point needs to be selected on the printing plane 11, the reference point is one of the four corners 12, the printhead can first press one corner 12, and the pressed corner 12 is used as the reference point to ensure that the reference point is the lowest point of the four corners 12, and then the printhead presses and levels at least two other corners 12, thereby completing the leveling of the printing platform 1 to the printhead.

[0066] In actual implementation, an elastic member 3 is also correspondingly provided between each corner 12 and the support frame 2. The projection of the printing platform 1 perpendicular to the first direction can be rectangular, square, trapezoidal, or triangular, pentagonal, hexagonal, or other regular shapes, and the locking assembly 4 and the elastic member 3 are correspondingly provided with the corners 12.

[0067] In an embodiment of the utility model, as shown in Figure 1 、 Figure 2 、 Figures 5 to 8 The printing platform 1 is provided with a fixing position 13 and at least two mounting positions 14, the printing platform 1 is rotationally connected with the support frame 2 at the fixing position 13, and the printing platform 1 is provided with a locking assembly 4 at each mounting position 14.

[0068] In the embodiment, the printing platform 1 is rotationally connected with the support frame 2 at the fixed position 13, that is, the relative distance between the printing platform 1 and the support frame 2 in the first direction at the fixed position 13 remains unchanged, but the printing platform 1 is adapted to be inclined relative to the fixed position 13. The printing platform 1 is further provided with at least two mounting positions 14, and each mounting position 14 is correspondingly provided with a locking assembly 4, so that the printing platform 1 is slidably connected with the support frame 2 in the first direction at the mounting position 14. It can be understood that an elastic member 3 can also be correspondingly arranged at each mounting position 14, and the printing platform 1 is connected with the support frame 2 at the mounting position 14 through the elastic member 3. Before leveling, the friction surface 43 of the locking assembly 4 and the friction force of the support frame 2 are zeroed, the printing platform 1 is naturally placed on the elastic member 3, the height of the printing platform 1 at the fixed position 13 is set to be not higher than the height of the printing platform 1 at the mounting position 14 at this time, and then the position of the printing plane 11 at the fixed position 13 is selected as a reference point to press down and level at least two mounting positions 14.

[0069] In actual implementation, the printing platform 1 can be provided with a connecting piece 41 and a fastener 42 at the fixed position 13, the connecting piece 41 is provided with a connecting hole 4122, the support frame 2 is correspondingly provided with a through hole corresponding to the connecting hole 4122, and the fastener 42 is connected to the connecting hole 4122 through the through hole, wherein the hole diameter of the through hole is consistent with the diameter of the connecting part 421 of the fastener 42, so as to limit the relative positions of the printing platform 1 and the support frame 2 in any direction, but the printing platform 1 can rotate relative to the support frame 2 around the fastener 42.

[0070] The utility model also proposes a kind of 3D printer, and the 3D printer includes printing head mechanism and hot bed 100, and the specific structure of the hot bed 100 refers to above-mentioned embodiment, since the present 3D printer adopts all technical solutions of above-mentioned all embodiments, at least has all beneficial effects brought by the technical solutions of above-mentioned embodiments, and here is not repeated in detail. Among them, printing head mechanism can level the printing platform 1 of hot bed 100, and specific leveling process is as described above, after leveling is completed, the relative position of printing platform 1 and support frame 2 is fixed by locking assembly 4 locking.

[0071] The above-mentioned is only exemplary embodiment of the utility model, and not therefore limit the patent range of the utility model, any equivalent structure transformation made in the technical concept of the utility model using the utility model specification and drawing contents or direct / indirect application in other related technical fields are included in the patent protection range of the utility model.

Claims

1. A heat bed, characterized by, The hot bed comprises: a printing platform provided with a printing plane for carrying a printed object; a support frame arranged on a side of the printing platform away from the printing plane, the support frame being spaced apart from the printing platform along a first direction perpendicular to the printing plane and being elastically connected by an elastic member; and a locking assembly arranged on the printing platform, the locking assembly having a friction surface abutting against the support frame, the friction surface being arranged parallel to the first direction, and the friction surface and the support frame having a friction force parallel to the first direction for limiting relative movement of the printing platform and the support frame in the first direction.

2. The thermal bed of claim 1, wherein, The locking assembly comprises a connecting member and a fastener, the connecting member being arranged on the printing platform; the connecting member has a first surface abutting against the support frame, the first surface being the friction surface, and the fastener being used to adjust the relative position of the first surface and the support frame in the first direction.

3. The thermal bed of claim 2, wherein, The connecting member is provided with a connecting hole, the fastener comprises a connecting portion and an abutting portion, the abutting portion being connected to one end of the connecting portion, the support frame is provided with a sliding hole, the other end of the connecting portion is arranged in the sliding hole and connected to the connecting hole, and the abutting portion is provided with a second surface, the second surface abutting against the support frame, and the second surface also being the friction surface.

4. The thermal bed of claim 3, wherein, The connecting member comprises a first portion and a second portion connected at an included angle, the first portion being connected to a side of the printing platform away from the printing plane, and the second portion being arranged parallel to the first direction and provided with the first surface and the connecting hole.

5. The thermal bed of claim 4, wherein, The first portion is provided with a limiting groove, the support frame is provided with a limiting protrusion, one end of the elastic member is limited in the limiting groove, and the other end of the elastic member is sleeved on the limiting protrusion.

6. The thermal bed of claim 3, wherein, The sliding hole is arranged extending along the first direction, the diameter of the connecting portion is consistent with the width of the sliding hole, and the direction of the width is perpendicular to the first direction; and / or, the diameter of the connecting portion is consistent with the hole diameter of the connecting hole.

7. The thermal bed of any one of claims 1 to 6, wherein, The locking assembly comprises a plurality of locking assemblies, and the elastic member also comprises a plurality of elastic members, each elastic member being arranged close to a locking assembly, and the elastic force direction of the elastic member being arranged parallel to the first direction.

8. The thermal bed of any one of claims 1 to 6, wherein, The projection of the printing platform perpendicular to the first direction is arranged in a quadrilateral shape and has four corners, the locking assembly comprises four locking assemblies, and each locking assembly is arranged corresponding to a corner.

9. The thermal bed of any one of claims 1 to 6, wherein, The printing platform is provided with a fixed position and at least two mounting positions, the printing platform is rotationally connected with the support frame at the fixed position, and the printing platform is provided with one locking assembly at each mounting position.

10. A 3D printer characterized by, The 3D printer comprises a printing head mechanism and the hot bed according to any one of claims 1 to 9, and the printing head mechanism is adapted to press the printing platform to level the printing plane.

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