Printing platform assembly and three-dimensional forming equipment

Abstract

The utility model discloses a printing platform assembly and three-dimensional forming equipment, which can realize the release of the swelling amount of a hot bed substrate through the relative movement between the bracket or the hot bed substrate and the first connecting piece mainly through a movable space between the first connecting piece and at least one of the hot bed substrate and the bracket. According to the main technical scheme, the printing platform assembly comprises a hot bed base plate; a bracket; the first connecting pieces are connected with the hot bed base plate and the support respectively, a movable space is formed between at least one of the hot bed base plate and the support and the first connecting pieces, and the movable space is used for avoiding expansion deformation of the hot bed base plate. The utility model is mainly used for connecting models.

Description

TECHNICAL FIELD

[0001] The utility model relates to 3D printing technical field especially relates to a printing platform subassembly and stereoscopic forming equipment. BACKGROUND

[0002] In the FDM printer, the filament consumables are transmitted to the print head through the extruder, and after the consumables are heated and melted in the print head, they are sprayed to the printing platform through the nozzle. The substrate of the printing platform usually includes a metal plate and a heating element integrated on the metal plate. During the printing process, the metal plate is heated to enable the first layer of the model to be firmly connected with the printing platform, thereby preventing the model from warping or falling off.

[0003] The existing substrate and the support frame of the printing platform are usually connected by bolts. There is no relative movement allowance between the substrate and the support frame. The substrate will deform with the support frame due to the deformation caused by the machining error of the support frame, or the metal plate will expand and deform after being heated. The deformation will be released between the bolts, which will cause the flatness of the substrate to deviate. Moreover, the deformation varies each time, which leads to a decrease in the quality of 3D printing or even a printing failure. SUMMARY

[0004] Therefore, in order to solve at least one of the above technical problems, the utility model provides a printing platform subassembly and a stereoscopic forming equipment.

[0005] To achieve the above-mentioned purpose, the utility model mainly provides the following technical scheme:

[0006] On the one hand, the utility model provides a printing platform subassembly, which comprises:

[0007] a hot bed substrate;

[0008] a support frame;

[0009] a plurality of first connecting pieces, each of which is connected with the hot bed substrate and the support frame, and at least one of the hot bed substrate and the support frame has a movement space with the first connecting piece, which is used for the expansion deformation of the hot bed substrate.

[0010] The hot bed substrate comprises a top surface, and the movement space comprises a first movement space. The top surface is used for directly or indirectly connecting a printing model. In this way, the hot bed substrate can be connected with the printing model in a stable and reliable manner.

[0011] The first connecting piece is inserted into the first limiting part, and the first connecting piece has a first movement space with the edge of the first limiting part. The movement direction of the hot bed substrate corresponding to the first movement space is parallel to the top surface.

[0012] Or;

[0013] The first limiting part is arranged on at least one of the heat bed substrate and the support, the first connecting piece is inserted into the first limiting part, the first movable space is a gap between the first connecting piece and the edge of the first limiting part, the moving direction of the heat bed substrate corresponding to the first movable space is parallel to the top surface, and the size of the gap is directly proportional to the size of the heat bed substrate and / or the working temperature of the heat bed substrate.

[0014] Or;

[0015] The first limiting part is arranged on at least one of the heat bed substrate and the support, the first connecting piece is inserted into the first limiting part, the first movable space is a gap between the first connecting piece and the edge of the first limiting part, the moving direction of the heat bed substrate corresponding to the first movable space is parallel to the top surface, and the size of the gap is directly proportional to the size of the heat bed substrate and / or the working temperature of the heat bed substrate.

[0016] Or;

[0017] The first limiting part is arranged on at least one of the heat bed substrate and the support, the first connecting piece is inserted into the first limiting part, the first movable space is a gap between the first connecting piece and the edge of the first limiting part, the moving direction of the heat bed substrate corresponding to the first movable space is parallel to the top surface, and the size of the gap is directly proportional to the size of the heat bed substrate and / or the working temperature of the heat bed substrate.

[0018] The first limiting part is arranged on at least one of the heat bed substrate and the support, the first connecting piece is inserted into the first limiting part, the first movable space is a gap between the first connecting piece and the edge of the first limiting part, the moving direction of the heat bed substrate corresponding to the first movable space is parallel to the top surface, and the size of the gap is directly proportional to the size of the heat bed substrate and / or the working temperature of the heat bed substrate.

[0019] And / or;

[0020] The first connecting piece comprises a first limiting part and a limiting rod, the limiting rod is connected with the first limiting part, the limiting rod is inserted into the first limiting part arranged on the heat bed substrate, the first limiting part is provided with an embedded groove on the side close to the top surface, and the first limiting part is located in the embedded groove to limit the distance between the heat bed substrate and the support.

[0021] And / or;

[0022] The first connecting piece comprises a first limiting component and a limiting rod, the limiting rod is connected with the first limiting component, the limiting rod is inserted into a first limiting part provided on the hot bed base plate, the first limiting part is provided with an embedding groove on the side close to the top surface, the limiting component is located in the embedding groove to limit the distance between the hot bed base plate and the support, the cross-sectional area of the embedding groove increases in the direction close to the top surface, the first limiting component comprises an outer surface matched with the inner wall of the embedding groove, and the outer surface abuts against the inner wall of the embedding groove; or, a boss is formed between the embedding groove and the first limiting part, and the first limiting component abuts against the boss.

[0023] The printing platform assembly further comprises a fixed connecting assembly, the fixed connecting assembly and the first connecting piece are arranged at intervals, and the fixed connecting assembly is connected with the hot bed base plate and the support to limit the overall relative position of the hot bed base plate and the support.

[0024] The fixed connecting assembly comprises a fixing piece, a first adapter and a second adapter, the first adapter is connected with the hot bed base plate, the second adapter is connected with the support, and the fixing piece is connected with the first adapter and the second adapter to fix the first adapter and the second adapter.

[0025] And / or;

[0026] The fixed connecting assembly comprises one, the first connecting piece comprises three, and the first connecting piece and the fixed connecting assembly are arranged in a square shape.

[0027] And / or;

[0028] The fixed connecting assembly comprises a fixing piece, a first adapter and a second adapter, the first adapter is connected with the hot bed base plate, the second adapter is connected with the support, and the fixing piece is connected with the first adapter and the second adapter to fix the first adapter and the second adapter; one of the first adapter and the second adapter is provided with a second through hole, the fixing piece is arranged in the second through hole, the fixing piece has a movement space in the N direction in the second through hole, and the N direction is perpendicular to the top surface.

[0029] The movable space comprises a second movable space, and the printing platform assembly further comprises:

[0030] The elastic piece is arranged on at least one side of the first connecting piece, the elastic piece is used to limit the distance between the first connecting piece, the hot bed base plate and the support, and the elastic piece is used to provide a second movable space corresponding to the expansion deformation of any one of the hot bed base plate, the first connecting piece and the support.

[0031] The elastic piece surrounds the side of the first connecting piece.

[0032] And / or;

[0033] The first connecting piece comprises a limiting rod and a second limiting component connected with the limiting rod, the second limiting component and the elastic member are respectively arranged on opposite sides of the support, and the second limiting component is connected with the limiting rod at different positions for limiting different distances between the hot bed base plate and the support.

[0034] The printing platform assembly further comprises:

[0035] The shell and the second connecting piece, the shell is arranged between the hot bed base plate and the support, and at least one of the hot bed base plate and the shell has a third movable space with the second connecting piece, so as to avoid the expansion deformation of the hot bed base plate.

[0036] The shell is provided with a hollow structure, and the hollow structure is used for deformation, so that the second connecting piece is relatively elastic with the shell.

[0037] And / or;

[0038] The shell is provided with a hollow structure, and the hollow structure is used for deformation, so that the second connecting piece is relatively elastic with the shell.

[0039] In another aspect, the utility model also provides a kind of stereoscopic forming equipment, comprising the printing platform assembly of any one of the foregoing.

[0040] The printing platform assembly and the stereoscopic forming equipment provided by the utility model mainly have movable space between at least one of the hot bed base plate and the support and the first connecting piece, so that the deformation amount of the hot bed base plate itself or the relative position difference between the hot bed base plate and the support can be released by the relative movement between the support or the hot bed base plate and the first connecting piece.For example, when the support deforms, the deformation amount can be released by the movement of the first connecting piece relative to the support or the hot bed base plate, so that the hot bed base plate does not deform simultaneously with the support, or when the hot bed base plate expands due to heating, the hot bed base plate releases the expansion amount through the movable space, thereby avoiding the bending of the hot bed base plate due to the relative position difference between the hot bed base plate and the support, ensuring the flatness of the top surface of the hot bed base plate and the printing quality of the model. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 A structure schematic view of a printing platform assembly provided by the embodiment of the utility model in a first perspective view;

[0042] Figure 2 A structure schematic view of a printing platform assembly provided by the embodiment of the utility model in a second perspective view;

[0043] Figure 3An explosion structure schematic view of a printing platform assembly provided by the embodiment of the present application is shown in the figure;

[0044] Figure 4 A cross-sectional structure schematic view of the printing platform assembly provided by the embodiment of the present application at a first position is shown in the figure;

[0045] Figure 5 For Figure 4 A local enlarged schematic view of the printing platform assembly shown in the figure at a B position;

[0046] Figure 6 For Figure 4 A local enlarged schematic view of the printing platform assembly shown in the figure at a C position;

[0047] Figure 7 A cross-sectional structure schematic view of the printing platform assembly provided by the embodiment of the present application at a second position is shown in the figure;

[0048] Figure 8 A structure schematic view of a shell in the printing platform assembly provided by the embodiment of the present application is shown in the figure;

[0049] Figure 9 For Figure 8 A local enlarged schematic view of the printing platform assembly shown in the figure at a A position. DETAILED DESCRIPTION

[0050] In order to further illustrate the technical means and effects taken by the present application to achieve the predetermined purposes, the specific implementation, structure, features and effects of the printing platform assembly according to the present application are described in detail as follows in combination with the drawings and preferred embodiments. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0051] On the one hand, as Figures 1-7 The embodiment of the present application provides a printing platform assembly, which comprises:

[0052] A hot bed base plate 100;

[0053] A support 200;

[0054] A plurality of first connecting pieces 300, the first connecting pieces 300 are connected with the hot bed base plate 100 and the support 200 respectively, and at least one of the hot bed base plate 100 and the support 200 has a moving space with the first connecting piece 300, and the moving space is used for avoiding the expansion deformation of the hot bed base plate 100.

[0055] The stereoscopic forming device further comprises a base, a gantry mechanism, an X-axis mechanism and a print head. The print platform assembly is drivingly connected with the base. The gantry mechanism is arranged on the base. The X-axis mechanism is drivingly connected with the gantry mechanism. The print head is drivingly connected with the X-axis mechanism. The print head is located above the hot bed base plate 100. The base is used to drive the print platform assembly to move in the Y-axis direction. The gantry mechanism is used to drive the X-axis mechanism to move in the Z-axis direction. The X-axis mechanism is used to drive the print head to move in the X-axis direction, so that the print platform and the print head move relative to each other in the X-Y-Z three directions. At the same time, the print head sprays the consumables to the top surface of the hot bed base plate 100, so as to realize stereoscopic forming.

[0056] The support 200 is used to support the hot bed base plate 100. The support 200 is connected with the base of the stereoscopic forming device, for example, can be fixed on the Y-axis driving member of the base by bolts. In order to ensure the position stability of the hot bed base plate 100, the number of the first connecting members 300 is multiple. The multiple first connecting members 300 are used to fix the support 200 and the hot bed base plate 100 at multiple positions between the support 200 and the hot bed base plate 100, so that multiple fixing points are formed between the support 200 and the hot bed base plate 100. The structure of the support 200 can be various. In an embodiment, the support 200 comprises a central frame and four extension claws. The central frame can be a rectangular frame structure. The four extension claws are respectively located at the four corners of the central frame and extend away from each other. The four extension claws are connected with the first connecting members 300 at the ends away from the central frame. The hot bed base plate 100 can comprise a metal plate and a heating member integrated on the metal plate. The metal plate comprises a top surface. The heating member can be an electric resistance wire coiled on the bottom surface of the metal plate opposite to the top surface. The metal plate can be made of various materials, for example, can be an aluminum base plate. The hot bed base plate 100 naturally assumes a planar plate structure. When subjected to a large external force, the hot bed base plate 100 can be deformed, for example, can be bent. When heated, the hot bed base plate 100 will expand outwardly due to the expansion of the metal plate. The hot bed base plate 100 can directly contact the model, or a spring steel plate is connected on the hot bed base plate 100. The spring steel plate is used to connect the model.

[0057] The hot bed base plate 100 and the support 200 can be connected with the first connecting members 300 in a movable manner or in a fixed manner. The hot bed base plate 100 and the support 200 can be connected with the first connecting members 300 in a movable manner or in a fixed manner. The movable space can be a gap between the hot bed base plate 100 and / or the support 200 and the first connecting members 300. Alternatively, a deformation member, for example, rubber or foam, can be arranged between the hot bed base plate 100 and / or the support 200 and the first connecting members 300. The deformation member is compressed to provide the movable space.

[0058] The setting of the activity space is used for avoiding deformation of the thermal bed substrate 100, so that the thermal bed substrate 100 is not pressed inwards when being expanded due to heat, and the phenomenon of bending is avoided. More specifically, the deformation avoiding space includes avoiding deformation of the thermal bed substrate 100 extending outwards, so that the thermal bed substrate 100 is not limited by the position of the first connecting piece 300, and the expansion is not concentrated between the first connecting pieces 300, and the bending of the thermal bed substrate 100 is avoided. At the same time, the deformation avoiding space also includes avoiding deformation of the thermal bed substrate 100 in the direction close to the first connecting piece 300, such as the thermal bed substrate 100 and the first connecting piece 300 have an activity space, the first connecting piece 300 can pass through the thermal bed substrate 100, and the inner wall of the insertion hole or the insertion slot of the thermal bed substrate 100 can be retracted through the activity space.

[0059] The setting of the activity space is also used for avoiding deformation of the bracket 200, such as avoiding machining error of the bracket 200, or avoiding deformation of the bracket 200 due to heat or long use. When the bracket 200 deforms, the thermal bed substrate 100 is not deformed at the same time through the first connecting piece 300. For example, when the extension claw of the bracket 200 is shorter than the standard length due to machining error, the change of the connection position caused by the error can be released through the activity space, and the thermal bed substrate 100 is prevented from being pressed due to the short extension claw.

[0060] The printing platform assembly and the stereoscopic forming equipment provided by the utility model mainly have the activity space between at least one of the thermal bed substrate and the bracket and the first connecting piece, so that the deformation amount of the thermal bed substrate or the relative position difference between the thermal bed substrate and the bracket can be released through the relative movement between the bracket or the thermal bed substrate and the first connecting piece. For example, when the bracket deforms, the deformation amount can be released through the movement of the first connecting piece relative to the bracket or the thermal bed substrate, so that the thermal bed substrate does not deform at the same time as the bracket, or when the thermal bed substrate expands due to heat, the thermal bed substrate releases the expansion amount through the activity space, so that the thermal bed substrate is prevented from bending, the flatness of the top surface of the thermal bed substrate is ensured, and the printing quality of the model is ensured.

[0061] In one embodiment, the thermal bed substrate 100 includes a top surface, and the activity space includes a first activity space. The first limiting part 101 is arranged on at least one of the thermal bed substrate 100 and the bracket 200, the first connecting piece 300 passes through the first limiting part 101, the first connecting piece 300 and the edge of the first limiting part 101 have the first activity space, and the activity direction of the thermal bed substrate 100 corresponding to the first activity space is parallel to the top surface.

[0062] The top surface is the surface of the hot bed base plate 100 away from the support 200. It can be understood that the parallel in the present application can not be absolute parallel, such as slight inaccuracy caused by processing error or assembly error, which also belongs to the category of parallel.

[0063] Specifically, the top surface can include a printing platform for directly contacting a printing model, or indirectly connecting a printing model through a mounting model printing platform.

[0064] That is, the hot bed base plate 100 and / or the support 200 have at least a spatial allowance of position activity in the direction parallel to the top surface as the first activity space, which allows the hot bed base plate 100 and / or the support 200 to outwardly expand, inwardly shrink, or the first limiting portion 101 to inwardly shrink close to the first connecting piece 300 in the direction parallel to the top surface.

[0065] The first limiting portion 101 can be a variety of structures that realize the insertion of the first connecting piece 300, such as a jack or a slot provided on the hot bed base plate 100.

[0066] In the embodiment of the jack, the jack is a through hole passing through the top surface of the hot bed base plate 100 and the bottom surface of the opposite top surface, and the first connecting piece 300 has a gap as the first activity space between the hole wall of the jack, or an elastic member is arranged between the hole wall of the jack, and the elasticity of the elastic member is the first activity space. For example, the first connecting piece 300 can be a bolt, and the hot bed base plate 100 is provided with a jack, and after the first connecting piece 300 is inserted into the jack, it is screwed to the support 200. When the support 200 deforms, the first connecting piece 300 deforms with the support 200, and moves relative to the hot bed base plate 100 through the gap between the first connecting piece 300 and the jack, thereby avoiding the influence of the deformation of the support 200 on the shape of the hot bed base plate 100. When the hot bed base plate 100 is heated and expands, the hot bed base plate 100 moves relative to the first connecting piece 300, and the edge of the jack shrinks inwardly, thereby realizing outward expansion without being constrained by the first connecting piece 300, and avoiding being pressed and bent. The jack provided on the support 200 has a similar principle as described above, which is not described here. Alternatively, the jacks can be provided on the hot bed base plate 100 and the support 200 at the same time, and the first connecting piece 300 can still be a bolt, and after the first connecting piece 300 is inserted into the jacks of the hot bed base plate 100 and the support 200, a nut is connected at the end of the support 200 away from the hot bed base plate 100.

[0067] In the embodiment of the slot, the slot is a groove with an opening on the bottom surface of the opposite top surface of the hot bed substrate 100, and the gap is provided between the inner groove sidewall of the slot and the first connecting member 300, or the elastic member is provided between the inner sidewall of the slot. For example, the first connecting member 300 can be a rod-shaped structure with an elastic ring, and the hot bed substrate 100 is provided with a slot, and the inner sidewall of the slot is provided with a ring groove matched with the elastic ring. The elastic ring is extruded by the edge of the slot and enters the slot, and restores the shape at the ring groove and is embedded in the ring groove. The other end of the first connecting member 300 can be screwed to the support 200. When the support 200 deforms, the first connecting member 300 deforms with the support 200, and moves relative to the hot bed substrate 100 through the gap between the first connecting member 300 and the slot, thereby avoiding the influence of the deformation of the support 200 on the shape of the hot bed substrate 100. When the hot bed substrate 100 is heated and expands, the hot bed substrate 100 moves relative to the first connecting member 300, and the edge of the slot is retracted, thereby realizing the expansion outward without being constrained by the first connecting member 300, and avoiding being bent under pressure. The slot provided on the support 200 has a similar principle as described above, which will not be described here. Alternatively, the slot can be provided on the hot bed substrate 100 and the support 200 at the same time, and the two ends of the first connecting member 300 are provided with the elastic ring as described above, and the first connecting member 300 is inserted into the slots of the hot bed substrate 100 and the support 200.

[0068] In an embodiment, the size of the gap is proportional to the size of the hot bed substrate 100, that is, the larger the size of the hot bed substrate 200, the larger the size of the gap.

[0069] In an embodiment, the size of the gap is proportional to the working temperature of the hot bed substrate 100, that is, the higher the working temperature of the hot bed substrate 200, the larger the size of the gap.

[0070] In an embodiment, the size of the gap is proportional to the size of the hot bed substrate 100 and the working temperature of the hot bed substrate 100, that is, the larger the size of the hot bed substrate 200, the higher the working temperature of the hot bed substrate 200, and the larger the size of the gap.

[0071] In an embodiment, the working temperature is the temperature that the hot bed substrate 200 bears when the printer prints a model, for example, 20-100 degrees Celsius. The size of the hot bed substrate 200 is the length and width of the hot bed substrate 200, and the length and width of the exemplary hot bed substrate 200 are within the range of 0-350 mm, but are not limited in particular.

[0072] In one embodiment, the hot bed substrate 100 is rectangular, and the gap has a first gap size corresponding to the length direction of the hot bed substrate 100 and a second gap size corresponding to the width direction of the hot bed substrate 100. The first gap size is proportional to the length of the hot bed substrate 100 and / or the working temperature of the hot bed substrate 100, and the second gap size is proportional to the width of the hot bed substrate 100 and / or the working temperature of the hot bed substrate 100. That is, the first gap size and the second gap size are different.

[0073] In one embodiment, the gap size is in the range of 0.2mm-1mm, such as 0.2mm, 0.3mm, 0.35mm, 0.4mm, 0.48mm, 0.50mm, 0.55mm, 0.6mm, 0.68mm, 0.7mm, 0.75mm, etc.

[0074] In one embodiment, the first connecting member 300 includes a first limiting component 310 and a limiting rod 320. The limiting rod 320 is connected to the first limiting component 310 and penetrates a first limiting part 101 provided on the hot bed substrate 100. The first limiting part 101 is provided with an embedding groove 102 on the side close to the top surface. The first limiting component 310 is located in the embedding groove 102 to limit the distance between the hot bed substrate 100 and the support 200.

[0075] The first limiting component 310 can be a nut of a bolt, the limiting rod 320 can be a screw rod of the bolt, and the first limiting part 101 can be a jack. The jack can be an opening provided on the hot bed substrate 100 and is located in the groove bottom of the embedding groove 102 close to the support 200. The first limiting component 310 is located in the embedding groove 102 as a whole, and the top surface of the first limiting component 310 is lower than the top surface of the hot bed substrate 100 or is located in the same plane as the top surface of the hot bed substrate 100, thereby avoiding scratching caused by the protrusion of the first limiting component 310.

[0076] The embedding groove 102 can have various shapes. In one optional embodiment, the cross-sectional area of the embedding groove 102 increases in the direction close to the top surface. The first limiting component 310 includes an outer surface matched with the inner wall of the embedding groove 102, and the outer surface abuts against the inner wall of the embedding groove 102. For example, the inner wall of the embedding groove 102 is a tapered inner wall. It is worth noting that when the limiting rod 320 moves relative to the jack, the first limiting component 310 will slide relative to the inner wall of the embedding groove 102 along with the limiting rod 320, and will not limit the relative movement of the limiting rod 320 and the edge of the jack.

[0077] Alternatively, in another alternative embodiment, the inner side wall of the embedding groove 102 is cylindrical, and a boss parallel to the top surface is formed between the inner side wall of the embedding groove 102 and the insertion hole. The side surface of the first limiting component 310 opposite to the limiting rod 320 is a plane parallel to the top surface, and then abuts against the boss surface. And there is a gap between the inner side wall of the embedding groove 102 and the side wall of the first limiting component 310, or the gap is filled with elastic members such as foam. Then the first limiting component 310 and the embedding groove 102 can move in the direction parallel to the top surface, and the relative movement of the limiting rod 320 and the edge of the insertion hole is not limited.

[0078] In an embodiment, the printing platform assembly further comprises a fixed connection assembly 600, the fixed connection assembly 600 and the first connecting piece 300 are arranged at intervals, and the fixed connection assembly 600 is connected with the heat bed base plate 100 and the support 200 respectively to define the overall relative position of the heat bed base plate 100 and the support 200.

[0079] The fixed connection assembly 600 fixes the relative position of the heat bed base plate 100 and the support 200 as a whole, or in other words, only the relative position of the connection points of the heat bed base plate 100 and the support 200 with the fixed connection assembly 600 is fixed, and for other positions of the heat bed base plate 100 other than the connection points with the fixed connection assembly 600, at least the movement in the direction parallel to the top surface relative to the support 200 is allowed, thereby realizing the tolerance of the machining error of the support 200, and the outward expansion when the heat bed base plate 100 is heated and expanded. The fixed connection assembly 600 is used to fix the horizontal relative position and the vertical relative position of the heat bed base plate 100 and the support 200 as a whole, to avoid the horizontal movement of the heat bed base plate 100 as a whole caused by the gap between the first connecting piece 300 and the first through hole 101, and to avoid the problem of unstable height during printing caused by the vertical movement of the heat bed base plate 100.

[0080] The fixed connection assembly 600 and the first connecting piece 300 are arranged at intervals, thereby avoiding the influence of the fixed connection assembly 600 on the amplitude of the deformation of the heat bed base plate 100 released through the first connecting piece 300. For example, the first connecting piece 300 can be three, the fixed connection assembly 600 can be one, the heat bed base plate 100 can be a rectangular plate, and the first connecting piece 300 and the fixed connection assembly 600 can be arranged in a square shape, such as three first connecting pieces 300 and the fixed connection assembly 600 arranged near the four corners of the heat bed base plate 100, thereby expanding towards the other three corners different from the corner where the fixed connection assembly 600 is located when the heat bed base plate 100 is heated and expanded.

[0081] The composition of the fixed connection assembly 600 can be various, for example, the fixed connection assembly 600 comprises an integrated adapter, and the two ends of the adapter are connected to the hot bed base plate 100 and the support 200 respectively, and the connection mode can be bolted, clamped, etc. For another example, the fixed connection assembly 600 comprises a fixing piece 630, a first adapter 610 and a second adapter 620, the first adapter 610 is connected to the hot bed base plate 100, the second adapter 620 is connected to the support 200, and the fixing piece 630 is connected to the first adapter 610 and the second adapter 620 respectively, and is used for the connection and fixation of the first adapter 610 and the second adapter 620.

[0082] The fixing piece 630 can be used in various ways to fix the first adapter 610 and the second adapter 620, such as bolted, clamped, inserted, etc., or the fixing piece 630 can also be an adhesive piece, and then the first adapter 610 and the second adapter 620 are bonded. According to the structure and fixing mode of the fixing piece 630, the first adapter 610 and the second adapter 620 are different, for example, in the embodiment of the fixing piece 630 being a bolt, the first adapter 610 can be an approximately L-shaped corner structure, one side of which is connected to the hot bed base plate 100, such as bolted, and the other side extends downward away from the hot bed base plate 100. The second adapter 620 can be a plate structure, such as being cut from the upper structure of the support 200 and folded downward to form, since the second adapter 620 is formed from the upper structure of the support 200, after processing the second adapter 620, a through hole 201 will be formed on the support 200. The first adapter 610 can pass through the support 200 through the through hole 201, and be opposite to the second adapter 620. One of the first adapter 610 and the second adapter 620 is processed with a second through hole 621, and the fixing piece 630 passes through the second through hole 621 and is screwed on the other of the first adapter 610 and the second adapter 620. For example, the first adapter 610 is provided with the second through hole 621. Then, through the fixation of the first adapter 610 and the second adapter 620 in the direction parallel to the top surface and the direction perpendicular to the top surface, the fixation of the hot bed base plate 100 and the support 200 as a whole is realized.

[0083] In an embodiment, one of the first adapter 610 and the second adapter 620 is provided with a second through hole 621, and the fixing piece 630 is arranged in the second through hole 621, and the fixing piece 630 has a movement space in the Nth direction in the second through hole 621, and the Nth direction is perpendicular to the top surface.

[0084] The second through hole 621 can be a strip-shaped hole extending in a direction perpendicular to the top surface. In the embodiment where the fixing member 630 is a bolt, the second through hole 621 can be implemented so that the fixing member 630 can move in the direction perpendicular to the top surface along the second through hole 621 when the fixing member 630 is not tightened. On the one hand, the first adapter 610 and the second adapter 620 have a higher universality. When the first adapter 610 and the second adapter 620 have a machining error, or when the heat bed base plate 100 and the support 200 have a deformation in the direction perpendicular to the top surface, the fixing member 630 can still pass through the second through hole 621 on the first adapter 610 and be connected to the threaded hole of the second adapter 620, avoiding the problem that the position error causes the connection to fail or affects the flatness of the heat bed base plate 100 after the connection. On the other hand, while limiting the heat bed base plate 100 and the support 200 in a plane parallel to the top surface, the fixing member 630 can move in the direction perpendicular to the top surface to release the amount of deformation of the heat bed base plate 100 in the direction perpendicular to the top surface, and avoid the thermal expansion in the direction perpendicular to the top surface.

[0085] In an embodiment, the movable space includes a second movable space, and the printing platform assembly further includes: an elastic member 400 arranged on at least one side of the first connecting member 300, the elastic member 400 being configured to limit the distance between the heat bed base plate 100 and the support 200, and the elastic member 400 being configured to provide a second movable space for the expansion deformation of any one of the heat bed base plate 100, the first connecting member 300, and the support 200.

[0086] The movable direction of the heat bed base plate 100, the first connecting member 300, and the support 200 corresponding to the second movable space is perpendicular to the top surface. The elastic member 400 can release the expansion amount of at least one of the heat bed base plate 100, the first connecting member 300, and the support 200 in the direction perpendicular to the top surface caused by thermal expansion, thereby avoiding the rigid extrusion of the heat bed base plate 100, such as the local depression of the top surface caused by the excessive extrusion of the nut of the first connecting member 300 on the top surface of the heat bed base plate 100. At the same time, the elastic member 400 can also release the height machining error of the support 200. For example, when the extension claw of the support 200 is deformed and the position is raised, the elastic member 400 can be deformed to reduce the distance between the extension claw and the heat bed base plate 100, thereby avoiding the influence of the deformation of the extension claw on the heat bed base plate 100. In use, the elastic member 400 applies an upward external force to the heat bed base plate 100, and cooperates with the first connecting member 300 to limit the distance between the heat bed base plate 100 and the support 200, so that the height position of the heat bed base plate 100 is stable.

[0087] In an embodiment, the elastic member 400 is arranged around the first connecting member 300, one end of the elastic member 400 is connected to the hot bed base plate 100, and the other end of the elastic member 400 is connected to the support 200. More specifically, one end of the elastic member 400 is connected to the side of the hot bed base plate 100 facing the support 200, and the other end of the elastic member 400 is connected to the side of the support 200 facing the hot bed base plate 100. It can be understood that the connection can be abutment, direct connection or indirect connection, wherein the direct connection or indirect connection can be fixed connection, detachable connection, etc. It should be noted that in the present embodiment, the abutment means that the two ends of the elastic member 400 are abutted and limited by the elastic force of the hot bed base plate 100 and the support 200, respectively. It should be further noted that due to the elastic property of the elastic member, the elastic force of the two ends of the elastic member 400 facing the hot bed base plate 100 and the support 200 still exists regardless of fixed connection or detachable connection.

[0088] For example, the elastic member 400 can be a spring, which is sleeved on the outer periphery of the first connecting member 300, or the elastic member 400 can be foam, soft glue, etc., which can be made into a cylindrical shape and sleeved on the outer periphery of the first connecting member 300. In this way, the position of the elastic member 400 is limited, so that the elastic member 400 is not bent out of position when it is deformed under stress, and the position of the elastic member 400 and the first connecting member 300 is more closely matched, achieving more accurate cooperation.

[0089] In some embodiments, the first connecting member 300 cooperates with the elastic member 400 to adjust the height of the hot bed base plate 100. For example, in an embodiment where the first connecting member 300 is a screw and the first connecting member 300 is screwed onto the stud of the support 200, the actual height of the hot bed base plate 100 can be adjusted by screwing the first connecting member 300 to different degrees according to actual needs, such as the actual height of the print head, and the degree of inclination of the hot bed base plate 100 can be adjusted by adjusting the position of the first connecting member 300. In the aforementioned embodiment including the fixing member 630, taking the first connecting member 300 as a screw as an example, during use, the fixing member 630 is first moved to a position where the first adapter 610 and the second adapter 620 are relatively loose, the first connecting member 300 is screwed to different positions, the height of the hot bed base plate 100 at different positions changes, until the top surface of the hot bed base plate 100 is at a suitable height and angle, and then the fixing member 630 is moved to fix the first adapter 610 and the second adapter 620 to fix the hot bed base plate 100.

[0090] Alternatively, in another embodiment, the first connecting member 300 comprises a limiting rod 320, which can be a stud, and a second limiting component connected with the limiting rod 320, which can be a nut. The second limiting component and the elastic member 400 are respectively arranged on opposite sides of the bracket 200, i.e. the stud is movably threaded through the through hole of the bracket 200, and then the nut is screwed. The second limiting component is connected with the limiting rod 320 at different positions to limit the distance between the hot bed base plate 100 and the bracket 200. According to actual requirements, such as the actual height of the print head, the actual height of the hot bed base plate 100 can be adjusted by screwing the second limiting component at different degrees, and the degree of inclination of the hot bed base plate 100 can be adjusted by adjusting the second limiting component at different positions. In the foregoing embodiment comprising the fixing member 630, the first connecting member 300 is taken as an example of a bolt. When in use, the fixing member 630 is first moved to a position where the first adapter 610 and the second adapter 620 are relatively loose, the second limiting component is screwed at different positions, the height of the hot bed base plate 100 at different positions will change, until the top surface of the hot bed base plate 100 is at a suitable height and angle, and then the fixing member 630 is moved to fix the first adapter 610 and the second adapter 620, and the hot bed base plate 100 is fixed.

[0091] In an embodiment, the printing platform assembly further comprises a housing 700 and a second connecting member 800. The housing 700 is arranged between the hot bed base plate 100 and the bracket 200. At least one of the hot bed base plate 100 and the housing 700 has a third movable space with the second connecting member 800, to provide a displacement space for the expansion and deformation of the hot bed base plate 100.

[0092] The housing 700 can only cover the bottom surface of the top surface opposite to the hot bed base plate 100, or the housing 700 can also cover the surrounding surface of the hot bed base plate 100 between the top surface and the bottom surface. The housing 700 plays a role of protecting and shielding the hot bed base plate 100 and the bottom surface heating member of the hot bed base plate 100, and can also play a role of heat preservation of the hot bed base plate 100 and avoiding accidental touch and scalding. The number of the second connecting member 800 can be multiple, which can be 12 dispersedly arranged around the edge of the hot bed base plate 100. At least one of the hot bed base plate 100 and the housing 700 has a third movable space with the second connecting member 800, so that there is a relative movement allowance between at least one of the hot bed base plate 100 and the housing 700 and the second connecting member 800. When the hot bed base plate 100 is heated and expanded, the deformation of the hot bed base plate 100 can be released by moving the second connecting member 800 relative to the hot bed base plate 100 or the housing 700, so that the hot bed base plate 100 can expand outward relative to the housing 700.

[0093] As can be the second connecting piece 800 and the shell 700 elastic connection, elastic connection can be through the elastic piece elastic connection, such as the second connecting piece 800 can be a bolt, the second connecting piece 800 is threaded on the shell 700 and is screwed on the hot bed base plate 100, the second connecting piece 800 and the perforation on the shell 700 have elastic pieces such as rubber or foam.

[0094] Alternatively, the second connecting piece 800 and the shell 700 can be achieved by the elastic structure of the shell 700 itself. In one embodiment, as shown in the shell 700 is provided with a hollow structure 701, the hollow structure 701 is used for deformation, so that the second connecting piece 800 and the shell 700 relative elastic. Figures 8-9

[0095] Among them, the hollow structure 701 includes at least one hollow, hollow can be a variety of shapes, designed to make the second connecting piece 800 relative to the shell 700 can be moved in more directions, that is, in one embodiment, the hollow structure 701 is arc hollow, the hollow structure 701 is arranged around the connection position of the second connecting piece 800 and the shell 700, which can ensure the coverage area of the hollow structure 701. The hollow structure 701 includes one or more hollows located on the side of the second connecting piece 800. As an alternative embodiment, the hollow structure 701 includes at least two hollows, at least two hollows are located on opposite sides of the second connecting piece 800, so as to realize the same movable space on at least opposite sides of the second connecting piece 800 in the radial direction. In another alternative embodiment, the hollow structure 701 includes an inner hollow and an outer hollow located on the side of the second connecting piece 800, and the outer hollow is located on the outer periphery of the inner hollow. Among them, the hollow structure 701 includes a plurality of hollows, such as the inner hollow and the outer hollow, which can be two. Two inner hollows are located on opposite sides of the second connecting piece 800, two outer hollows are located on opposite sides of the second connecting piece 800, and the inner hollow and the outer hollow are arranged in the radial direction of the second connecting piece 800. In turn, the second connecting piece 800 has a more uniform movable space in each direction, and the inner hollow and the outer hollow are arranged from inside to outside, so that the elastic force received by the second connecting piece 800 is moderate, which will not be too large to make the second connecting piece 800 difficult to move, nor will it be too small to make the shell 700 vibrate.

[0096] Specifically, the shell 700 is located between the hot bed base plate 100 and the support 200, and the shell 700 is provided with a clearance opening corresponding to the first connecting piece and / or the elastic piece.

[0097] On the other hand, the utility model also provides a three-dimensional forming equipment, including any one of the foregoing printing platform assemblies, and a base, a gantry mechanism, an X-axis mechanism and a print head. The connection relationship of each component can refer to the foregoing description, which will not be described here. ​

[0098] The stereolithography apparatus comprises the printing platform assembly of any one of the preceding, and comprises the advantages of the printing platform assembly of any one of the preceding, which will not be repeated here.

[0099] The above merely describes the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0100] The present application also provides the following implementation manners:

[0101] Label 1, a printing platform assembly, comprising:

[0102] A hot bed base plate 100;

[0103] A support 200;

[0104] A plurality of first connecting members 300, the first connecting members 300 are connected with the hot bed base plate 100 and the support 200 respectively, and at least one of the hot bed base plate 100 and the support 200 has a movement space with the first connecting members 300, and the movement space is used for avoiding the expansion deformation of the hot bed base plate 100.

[0105] Label 2, the printing platform assembly according to label 1,

[0106] The hot bed base plate 100 comprises a top surface, and the movement space comprises a first movement space, and the top surface is used for directly or indirectly connecting a printing model;

[0107] The hot bed base plate 100 and the support 200 at least one of which is provided with a first limiting portion 101, the first connecting members 300 are inserted in the first limiting portion 101, the first connecting members 300 and the edge of the first limiting portion 101 have the first movement space, and the movement direction of the hot bed base plate 100 corresponding to the first movement space is parallel to the top surface.

[0108] Label 3, the printing platform assembly according to label 2,

[0109] The first limiting portion 101 is a jack or a slot provided on the hot bed base plate 100, and the first connecting members 300 are inserted in the first limiting portion 101.

[0110] Label 4, the printing platform assembly according to label 2,

[0111] The first connecting piece 300 comprises a first limiting component 310 and a limiting rod 320, the limiting rod 320 is connected with the first limiting component 310, the limiting rod 320 penetrates the first limiting part 101 arranged on the hot bed base plate 100, the first limiting part 101 is arranged with an embedded groove 102 near one side of the top surface, and the first limiting component 310 is located in the embedded groove 102 to limit the distance between the hot bed base plate 100 and the support 200.

[0112] Label 5, the printing platform assembly according to label 4,

[0113] The cross-sectional area of the embedded groove 102 increases in the direction close to the top surface, the first limiting component 310 comprises an outer surface matched with the inner wall of the embedded groove 102, and the outer surface abuts against the inner wall of the embedded groove 102; or, a boss is formed between the embedded groove 102 and the first limiting part 101, and the first limiting component 310 abuts against the boss.

[0114] Label 6, the printing platform assembly according to label 1,

[0115] The printing platform assembly further comprises a fixed connecting assembly 600, the fixed connecting assembly 600 and the first connecting piece 300 are arranged at intervals, and the fixed connecting assembly 600 is connected with the hot bed base plate 100 and the support 200 respectively to limit the overall relative position of the hot bed base plate 100 and the support 200.

[0116] Label 7, the printing platform assembly according to label 6,

[0117] The fixed connecting assembly 600 comprises a fixed piece 630, a first adapter 610 and a second adapter 620, the first adapter 610 is connected with the hot bed base plate 100, the second adapter 620 is connected with the support 200, and the fixed piece 630 is connected with the first adapter 610 and the second adapter 620 respectively to fix the connection of the first adapter 610 and the second adapter 620.

[0118] Label 8, the printing platform assembly according to label 6,

[0119] The fixed connecting assembly 600 comprises one, the first connecting piece 300 comprises three, and the first connecting piece 300 and the fixed connecting assembly 600 are arranged in a square shape.

[0120] Label 9, the printing platform assembly according to label 7,

[0121] One of the first adapter 610 and the second adapter 620 is provided with a second through hole 621, and the fixing member 630 is arranged in the second through hole 621, and the fixing member 630 has a moving space along the Nth direction in the second through hole 621, and the Nth direction is perpendicular to the top surface.

[0122] Label 10, the printing platform assembly according to any one of labels 1-9, the moving space includes a second moving space, and the printing platform assembly further includes:

[0123] The elastic member 400 is arranged on at least one side of the first connecting member 300, and the elastic member 400 is used to limit the distance between the heat bed substrate 100 and the support 200, and the elastic member 400 is used to provide the second moving space corresponding to the expansion deformation of any one of the heat bed substrate 100, the first connecting member 300 and the support 200.

[0124] Label 11, the printing platform assembly according to label 10,

[0125] The elastic member 400 is arranged around the first connecting member 300.

[0126] Label 12, the printing platform assembly according to label 10,

[0127] The first connecting member 300 includes a limiting rod 320 and a second limiting component connected with the limiting rod 320, the second limiting component and the elastic member 400 are arranged on opposite sides of the support 200 respectively, and the second limiting component is connected with the limiting rod 320 at different positions to limit different distances between the heat bed substrate 100 and the support 200.

[0128] Label 13, the printing platform assembly according to label 1, the printing platform assembly further includes:

[0129] The shell 700 is arranged between the heat bed substrate 100 and the support 200, and at least one of the heat bed substrate 100 and the shell 700 has a third moving space with the second connecting member 800 to avoid the expansion deformation of the heat bed substrate 100.

[0130] Label 14, the printing platform assembly according to label 13,

[0131] The shell 700 is provided with a hollow structure 701, and the hollow structure 701 is used for deformation to make the second connecting member 800 relatively elastic with the shell 700.

[0132] Label 15, the printing platform assembly according to label 14,

[0133] The hollow structure 701 is arranged around the joint position of the second connecting piece 800 and the shell 700.

[0134] Label 16, the printing platform assembly according to label 14,

[0135] The hollow structure 701 includes one or more hollows on the side of the second connecting piece 800.

[0136] Label 16, the printing platform assembly according to label 14,

[0137] The hollow structure 701 includes an inner hollow and an outer hollow on the side of the second connecting piece 800, and the outer hollow is located on the outer periphery of the inner hollow.

[0138] Label 17, the printing platform assembly according to label 1,

[0139] The hot bed base plate 100 includes a top surface, and the movable space includes a first movable space, and the top surface is used for directly or indirectly connecting a printing model,

[0140] The hot bed base plate 100 and the bracket 200 are provided with a first limiting portion 101, the first connecting piece 300 penetrates the first limiting portion 101, the first movable space is a gap between the first connecting piece 300 and the edge of the first limiting portion 101, the movement direction of the hot bed base plate 100 corresponding to the first movable space is parallel to the top surface, and the size of the gap is proportional to the size of the hot bed base plate 100 and / or the working temperature of the hot bed base plate 100.

[0141] Label 18, the printing platform assembly according to label 1,

[0142] The hot bed base plate 100 includes a top surface, and the movable space includes a first movable space, and the top surface is used for directly or indirectly connecting a printing model,

[0143] The first limiting part 101 is arranged on at least one of the heat bed substrate 100 and the support 200, the first connecting piece 300 is threaded through the first limiting part 101, the first activity space is a gap between the first connecting piece 300 and the edge of the first limiting part 101, the activity direction of the heat bed substrate 100 corresponding to the first activity space is parallel to the top surface, the size of the gap includes a first gap size corresponding to the length direction of the heat bed substrate 100 and a second gap size corresponding to the width direction of the heat bed substrate 100, the size of the first gap is directly proportional to the length of the heat bed substrate 100 and / or the working temperature of the heat bed substrate 100, and the size of the second gap is directly proportional to the width of the heat bed substrate 100 and / or the working temperature of the heat bed substrate 100.

[0144] Label 19, the printing platform assembly according to label 1,

[0145] The heat bed substrate 100 includes a top surface, and the activity space includes a first activity space, and the top surface is used for directly or indirectly connecting a printing model,

[0146] The first limiting part 101 is arranged on at least one of the heat bed substrate 100 and the support 200, the first connecting piece 300 is threaded through the first limiting part 101, the first activity space is a gap between the first connecting piece 300 and the edge of the first limiting part 101, the activity direction of the heat bed substrate 100 corresponding to the first activity space is parallel to the top surface, wherein the size of the gap ranges from 0.2mm to 1mm.

Claims

1. A print platform assembly, characterized by, The printing platform assembly comprises: a hot bed substrate; a support; a plurality of first connecting members, each of which is connected to the hot bed substrate and the support, and at least one of the hot bed substrate and the support has a movement space with the first connecting member, which is used for avoiding the expansion deformation of the hot bed substrate.

2. The printing platform assembly according to claim 1, wherein: the hot bed substrate comprises a top surface, and the movement space comprises a first movement space, and the top surface is used for directly or indirectly connecting a printing model, and wherein: at least one of the hot bed substrate and the support is provided with a first limiting portion, and the first connecting member is inserted into the first limiting portion, and the first connecting member and the edge of the first limiting portion have the first movement space, and the movement direction of the hot bed substrate corresponding to the first movement space is parallel to the top surface; or; at least one of the hot bed substrate and the support is provided with a first limiting portion, and the first connecting member is inserted into the first limiting portion, and the first movement space is a gap between the first connecting member and the edge of the first limiting portion, and the movement direction of the hot bed substrate corresponding to the first movement space is parallel to the top surface, and the size of the gap is proportional to the size of the hot bed substrate and / or the working temperature of the hot bed substrate; or; at least one of the hot bed substrate and the support is provided with a first limiting portion, and the first connecting member is inserted into the first limiting portion, and the first movement space is a gap between the first connecting member and the edge of the first limiting portion, and the movement direction of the hot bed substrate corresponding to the first movement space is parallel to the top surface, and the size of the gap comprises a first gap size corresponding to the length direction of the hot bed substrate and a second gap size corresponding to the width direction of the hot bed substrate, and the first gap size is proportional to the length of the hot bed substrate and / or the working temperature of the hot bed substrate, and the second gap size is proportional to the width of the hot bed substrate and / or the working temperature of the hot bed substrate; or; at least one of the hot bed substrate and the support is provided with a first limiting portion, and the first connecting member is inserted into the first limiting portion, and the first movement space is a gap between the first connecting member and the edge of the first limiting portion, and the movement direction of the hot bed substrate corresponding to the first movement space is parallel to the top surface, and the size of the gap ranges from 0.2mm to 1mm.

3. The printing platform assembly according to claim 2, wherein: the first limiting portion is a socket or a slot provided on the hot bed substrate, and the first connecting member is inserted into the first limiting portion; and / or; the first connecting member comprises a first limiting part and a limiting rod, the limiting rod is connected to the first limiting part, the limiting rod is inserted into the first limiting portion provided on the hot bed substrate, and the side of the first limiting portion close to the top surface is provided with an embedding groove, and the first limiting part is located in the embedding groove to limit the distance between the hot bed substrate and the support; and / or; The first connecting piece comprises a first limiting component and a limiting rod, the limiting rod is connected with the first limiting component, the limiting rod is inserted into the first limiting part provided on the hot bed base plate, the first limiting part is provided with an embedded groove near one side of the top surface, the first limiting component is located in the embedded groove to limit the distance between the hot bed base plate and the support, the cross-sectional area of the embedded groove increases in the direction close to the top surface, the first limiting component comprises an outer surface matched with the inner wall of the embedded groove, and the outer surface abuts against the inner wall of the embedded groove; or, a boss is formed between the embedded groove and the first limiting part, and the first limiting component abuts against the boss.

4. The print platform assembly of claim 1, wherein, The printing platform assembly further comprises a fixed connecting assembly, the fixed connecting assembly and the first connecting piece are arranged at intervals, and the fixed connecting assembly is connected with the hot bed base plate and the support respectively to define the overall relative position of the hot bed base plate and the support.

5. The printing platform assembly according to claim 4, wherein, The hot bed base plate is movably connected with the support through the first connecting piece; The fixed connecting assembly comprises a fixing piece, a first adapter and a second adapter, the first adapter is connected with the hot bed base plate, the second adapter is connected with the support, and the fixing piece is connected with the first adapter and the second adapter respectively to fix the connection between the first adapter and the second adapter; And / or; The number of the fixed connecting assembly is one, the number of the first connecting piece is three, and the first connecting piece and the fixed connecting assembly are arranged in a square shape; And / or; The fixed connecting assembly comprises a fixing piece, a first adapter and a second adapter, the first adapter is connected with the hot bed base plate, the second adapter is connected with the support, and the fixing piece is connected with the first adapter and the second adapter respectively to fix the connection between the first adapter and the second adapter; one of the first adapter and the second adapter is provided with a second through hole, the fixing piece is arranged in the second through hole, the fixing piece has a movement space in the Nth direction in the second through hole, and the Nth direction is perpendicular to the top surface of the hot bed base plate.

6. The print platform assembly of any of claims 1-5, wherein, The movable space comprises a second movable space, and the printing platform assembly further comprises: An elastic piece, the elastic piece is arranged on at least one side of the first connecting piece, the elastic piece is used to limit the distance between the first connecting piece, the hot bed base plate and the support, and the elastic piece is used to provide the second movable space corresponding to the expansion deformation of any one of the hot bed base plate, the first connecting piece and the support.

7. The printing platform assembly according to claim 6, wherein, The elastic piece is located between the hot bed base plate and the support, and the two ends of the elastic piece are connected with or abut against the hot bed base plate and the support respectively; and / or The elastic piece is arranged around the side of the first connecting piece; and / or The first connecting member comprises a limiting rod and a second limiting component connected with the limiting rod, the second limiting component and the elastic member are respectively arranged on opposite sides of the support, and the second limiting component is connected with different positions of the limiting rod to limit different distances between the hot bed substrate and the support.

8. The print platform assembly of claim 1, wherein, The printing platform assembly further comprises: a shell and a second connecting member, the shell is arranged between the hot bed substrate and the support, and at least one of the hot bed substrate and the shell has a third active space with the second connecting member for avoiding expansion deformation of the hot bed substrate.

9. The printing platform assembly according to claim 8, wherein, a hollow structure is arranged on the shell, and the hollow structure is used for deformation to make the second connecting member relatively bounce with the shell; and / or; a hollow structure is arranged on the shell, and the hollow structure is used for deformation to make the second connecting member relatively bounce with the shell, wherein the hollow structure is arranged around the connection position of the second connecting member and the shell; or the hollow structure comprises one or more hollows arranged on the side of the second connecting member; or the hollow structure comprises an inner hollow and an outer hollow arranged on the side of the second connecting member, and the outer hollow is located outside the inner hollow.

10. A stereolithography apparatus, characterized in that The printing platform assembly comprises any one of the above claims 1-9.

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