Light curing platform flexible bolt leveling device capable of avoiding assembly stress

Abstract

The utility model belongs to the technical field of 3D printing, and relates to a light curing platform flexible bolt leveling device capable of avoiding assembly stress, which comprises a connecting plate, a support frame, a forming platform and a platform support plate, a first screw hole is arranged on the platform support plate, and a hollow screw is in threaded connection in the first screw hole. Threads on the outer circumference of the hollow screw are meshed with the first screw hole; a blind hole is formed in the lower surface of the forming platform, and a thread is arranged on the inner circumferential wall of the blind hole and corresponds to the first screw hole; a first bolt is in threaded connection in the blind hole, and the diameter of a screw rod of the first bolt is smaller than that of the cylindrical inner hole of the hollow screw; the leveling mechanism provided by the utility model is convenient, the leveling mechanism is prevented from loosening in the printing process through the bidirectional locking bolts, and the problem that redundant materials need to be removed due to the fact that printed parts protrude is avoided; according to the chain lock flexible bolt structure, small-angle bending of the first bolt is achieved through the micro gap, and the problems that assembly stress is generated after leveling, and part failure is caused are solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to 3D printing technical field relates to a kind of light-cured platform flexible bolt leveling device for avoiding assembly stress. BACKGROUND

[0002] The sinking DLP surface exposure 3D printing technology is currently widely used mainstream technology for rapid manufacturing of non-metallic objects, and is widely used in medical orthopedics, jewelry, animation derivatives and other fields. The core mechanism of light-cured 3D printing technology is light-cured polymerization, and the forming material will undergo a light-cured reaction when exposed to light of the corresponding wavelength, instantly changing from a liquid to a solid. The printing software processes the uploaded slice file to make the DLP light machine project the file layer by layer. The sinking DLP uses an upper exposure printing method, and the light projected by the light source is projected vertically from the top to the upper surface of the photosensitive resin through a mirror. The Z-axis lifting platform controls the exposure and curing of each layer. After each layer is exposed, the Z-axis moves down by one slice layer thickness, and then the scraper scrapes off the residual resin on the surface of the resin tank while bringing a new uniform resin layer, which levels the liquid surface, waits for the next exposure, and repeats the process to cure and form layer by layer, as shown in FIG. Figure 1

[0003] However, during the printing and forming process of parts using light-cured technology, due to the installation error of the light machine projection device itself, it is difficult to ensure the machining and assembly accuracy of the parts during the assembly of the light-cured printing device to ensure that the light surface projected by the light machine is parallel to the forming platform, resulting in dimensional errors in the final parts achieved in actual printing, and data deviation from the three-dimensional model uploaded to the light-cured device, so that the manufactured parts cannot meet the work requirements.

[0004] For a light-cured 3D printer, whether the scraper can tightly fit the forming platform surface determines whether the overall printing of the part is successful. At the same time, whether the forming platform surface is perpendicular to the light machine projection spindle also determines whether the overall printing of the part is successful; Therefore, in the cantilever type light-cured printer, adjusting the angle of the forming platform plays a very important role. If the angle is not appropriate, the scraper will scratch the forming platform, and even cause mechanical failure.

[0005] In the prior art, application number utility model patent 202223170302.2, "a hand-operated leveling device, comprising a fixed seat and a platform arranged above the fixed seat, the platform is provided with three first threaded holes penetrating the platform upward and downward, a line connecting the three first threaded holes forms a triangle, a leveling screw is threadedly connected in the first threaded hole, the lower end of the leveling screw abuts against the fixed seat, the fixed seat and the platform support are provided with a fastening structure for fixing the platform after leveling the platform, the flatness of the platform is adjusted by rotating the leveling screw above the platform" ​

[0006] But the leveling screw is placed on the upper end of the platform, and the leveling device is suitable for air environment such as gyroscope, and is not suitable for liquid environment of slurry and photocuring process, because the upper end of the platform in the center is opened, which will cause the first several layers of the printed part to have protrusions, resulting in the failure of the printing of the part; a separate fastening mechanism needs to be provided in the middle of the fixed seat and the platform, which occupies the printing space of the trough; at the same time, the fastening mechanism designed in this patent can only be fixed in one direction, and there are still problems of loosening of the leveling screw and downward movement of the working platform; and there are too many holes, which is not suitable for photocuring 3D printing process.

[0007] The Chinese patent with application publication number CN114562988A discloses a leveling device, which comprises a leveling mounting disc, a leveling disc and three leveling screws, the three leveling screws are distributed in a circular array along the central axis of the leveling mounting disc, the upper surface of the leveling screw is provided with a screw sleeve mounting groove, the mounting sleeve is inserted into the screw sleeve mounting groove, and the installation difficulty is reduced, and the supported object can be prevented from rolling over.

[0008] However, the patent does not provide a fastening mechanism for fixing the leveling mounting disc, so the vibration generated in the photocuring process will cause the loosening of the leveling screw, the unevenness of the working platform during the printing process after leveling, the poor precision of the printed part, and the assembly stress after leveling.

[0009] Therefore, there is a need for a stable and reliable exposure 3D printing platform leveling device to solve the above technical problems. Content of the utility model

[0010] The technical scheme adopted by the utility model to solve the technical problems is: a photocuring platform flexible bolt leveling device for avoiding assembly stress, comprising: a connecting plate, a support frame, a forming platform and a platform support plate, the support frame is L-shaped, the connecting plate is detachably connected to the upper end of the L-shaped vertical part of the support frame, the platform support plate is detachably connected to the upper edge of the L-shaped horizontal part of the support frame, the forming platform is a rigid plate with a smooth and flat upper surface, and the platform support plate is supported on the lower surface of the forming platform from bottom to top; the connecting plate is used for fixedly installing a 3D printing device, the connecting plate is installed on a 3D printer, and the upper surface of the forming platform is used for carrying forming materials and products after printing and curing;

[0011] The platform support plate is provided with three first screw holes with vertical axes and not in the same plane, a hollow screw is threadedly connected in the first screw hole, the hollow screw is in a cylindrical shape, the end is in a circular arc structure, and the thread on the outer circumference of the hollow screw is engaged with the first screw hole; the lower surface of the forming platform is provided with three blind holes with vertical axes, the inner circumferential wall of the blind hole is provided with a thread, and the blind hole and the hole position of the first screw hole correspond one by one; a first bolt is threadedly connected in the blind hole, and the diameter of the screw rod of the first bolt is smaller than the diameter of the cylindrical inner hole of the hollow screw.

[0012] When the hollow screw spirals upward, the upper end face of the hollow screw pushes upward the lower surface of the forming platform; when the first bolt is screwed to the blind hole, the bolt cap of the first bolt pushes upward the lower end face of the hollow screw.

[0013] Preferably, the first bolt is opposite in thread direction to the hollow screw.

[0014] Preferably, the first bolt is a chain flexible bolt structure, and the bolt cap drives the first bolt chain connector and the second bolt chain connector to rotate to lock the bolt head to the forming platform.

[0015] Preferably, the hole positions of the first screw holes are in a regular triangle distribution.

[0016] Preferably, the periphery of the upper surface of the forming platform is further provided with at least three counterbores which are vertical in axis and not in the same plane; the upper surface of the platform support plate is provided with second screw holes which are vertical in axis and match the positions and number of the counterbores; when the countersunk head bolt is threadedly connected to the second screw holes through the counterbores, the countersunk head bolt detachably connects the forming platform and the platform support plate as a whole.

[0017] More preferably, the counterbores are four in number and are distributed at the four corners of the forming platform.

[0018] Preferably, the first bolt is a hexagonal socket bolt with a chain flexible structure, and the chain flexible structure is connected by nesting the first bolt chain connector and the second bolt chain connector, and there is a certain gap between the nested holes, so that the flexible bending function of the first bolt without assembly stress can be realized.

[0019] Preferably, the support frame is two in number, and the L-shaped horizontal part of the support frame clamps the three first screw holes inside.

[0020] Preferably, the connecting plate is provided with a plurality of screw holes or through holes for mounting the 3D printing equipment, and the screw holes or through holes are used to mount the connecting plate on the 3D printing equipment.

[0021] The beneficial effects of the present utility model are as follows:

[0022] 1. The leveling mechanism is manually adjusted, which is convenient.

[0023] 2. The present utility model effectively avoids the problem that the adjustment device of the forming platform is located on the upper surface when the light-cured printing parts are formed, so that the problem of protrusion of the printed parts and the need to remove redundant materials again is avoided.

[0024] 3. The present utility model reduces the burden of the application of electronic components, the control system and the software system, saves the space occupancy rate and manufacturing cost of the equipment, and saves the development time cost.

[0025] 4. The double bolt locking fixing mechanism designed by the utility model can realize the function of bidirectional fixing, solves the problem that the fixing mechanism in the prior art can only be fixed in one direction and the leveling screw is loose.

[0026] 5. The flexible bolt mechanism and the curved surface contact feature designed by the utility model can reduce the assembly stress caused by the different axes of the first bolt due to leveling, and solve the problem that the leveling bolt in the prior art leveling technology has assembly stress and part failure. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a sinking type DLP surface exposure 3D printing technology schematic diagram in the prior art;

[0028] Figure 2 is a perspective view of the flexible bolt leveling device of the photocuring platform of the utility model, which avoids generating assembly stress;

[0029] Figure 3 is a bottom view of the utility model;

[0030] Figure 4 is a top view of the double bolt leveling part of the utility model;

[0031] Figure 5 is a front view of the utility model;

[0032] Figure 6 is a top view of the Figure 5 A direction partial enlarged schematic view of the utility model;

[0033] Figure 7 is an exploded view of the Figure 6 of the utility model;

[0034] Figure 8 is a B direction partial enlarged schematic view of the Figure 5 of the utility model;

[0035] Figure 9 is an exploded view of the Figure 8 of the utility model;

[0036] Figure 10 is a force analysis diagram of the hollow screw of the utility model;

[0037] Figure 11 is a first bolt chain connecting piece schematic view of the utility model;

[0038] Figure 12 is a second bolt chain connecting piece schematic view of the utility model.

[0039] Wherein, 1, connecting plate; 2, support frame; 3, forming platform; 4, platform support plate; 5, first screw hole; 6, hollow screw; 7, blind hole; 8, first bolt (chain flexible bolt structure); 9, counterbore; 10, second screw hole; 11, countersunk bolt; 12, elastic washer; 8-1, first bolt chain connector; 8-2, second bolt chain connector. DETAILED DESCRIPTION

[0040] The related technologies in the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor fall within the protection scope of the utility model.

[0041] Reference Figures 1-12 The flexible bolt leveling device for the surface exposure 3D printing forming platform in the embodiment is used for, comprising: connecting plate 1, support frame 2, forming platform 3, platform support plate 4, the support frame 2 is L-shaped, the connecting plate 1 is detachably connected at the upper end of the L-shaped vertical part of the support frame 2, the platform support plate 4 is detachably connected at the upper edge of the L-shaped horizontal part of the support frame 2, the forming platform 3 is a rigid plate with smooth and flat upper surface, and the platform support plate 4 is supported on the lower surface of the forming platform 3 from bottom to top;The connecting plate 1 is used for fixedly installing 3D printing equipment, the connecting plate 1 is installed on the 3D printer, and the upper surface of the forming platform 3 is used for carrying forming material and product after printing solidification;

[0042] The platform support plate 4 is provided with three first screw holes 5 with vertical axis and not in the same plane, the hollow screw 6 is threadedly connected in the first screw hole 5, the hollow screw 6 is cylindrical, and the thread on the outer circumference of the hollow screw 6 is engaged with the first screw hole 5;The lower surface of the forming platform 3 is provided with three blind holes 7 with vertical axis, the inner circumferential wall of the blind hole 7 is provided with a thread, and the blind hole 7 corresponds to the hole position of the first screw hole 5 one by one;The first bolt 8 is threadedly connected in the blind hole 7, and the screw rod diameter of the first bolt 8 is less than the diameter of the cylindrical inner hole of the hollow screw 6;

[0043] When the hollow screw 6 is screwed upwards, the upper end of the hollow screw 6 pushes upwards against the lower surface of the forming platform 3; when the first bolt 8 is screwed into the blind hole 7, the bolt head of the first bolt 8 presses upwards against the lower cylindrical end face of the hollow screw 6; when it is necessary to adjust the level of the forming platform 3, the height of the hollow screw 6 is adjusted by adjusting the hollow screw 6 in the three first screw holes 5 respectively. Since the axes of the three first screw holes 5 are vertical and not in the same plane, and since three points confirm one plane, when the tops of the three hollow screws 6 are in a horizontal plane, the forming platform 3 is level; then the blind hole 7 is connected by the thread of the first bolt 8, and the bolt head of the first bolt 8 presses upwards against the lower cylindrical end face of the hollow screw 6, ensuring the stability of the thread position of the hollow screw 6 and preventing the hollow screw 6 from sliding and loosening, which would affect the level of the forming platform 3.

[0044] Furthermore, the hollow screw 6 has a protruding arc-shaped structure at its end, which allows the end of the hollow screw 6 to fully contact the circular groove structure of the forming platform 3 during the leveling process.

[0045] Furthermore, the threads of the first bolt 8 and the hollow screw 6 are opposite in direction; the opposite direction of rotation prevents the hollow screw 6 from slipping and loosening when the first bolt 8 is tightened.

[0046] Furthermore, the first bolt 8 is a chain-locked flexible bolt structure, with the middle part being nested and connected by the first bolt chain connector 8-1 and the second bolt chain connector 8-2. There is a certain gap between the nested holes, which enables the first bolt 8 to have a flexible bending function without assembly stress.

[0047] Furthermore, the first screw hole 5 is arranged in an equilateral triangle pattern; the equilateral triangle arrangement of the first screw hole 5 makes horizontal adjustment simpler, more convenient, faster, and more efficient.

[0048] Furthermore, the outer periphery of the upper surface of the forming platform 3 is provided with at least three vertical countersunk holes 9 that are not in the same plane, and the countersunk holes 9 are through holes; the upper surface of the platform support plate 4 is provided with second vertical screw holes 10 that match the position and number of the countersunk holes 9; when the countersunk bolt 11 is threaded into the second screw hole 10 after passing through the countersunk hole 9, the countersunk bolt 11 detachably connects the forming platform 3 and the platform support plate 4 into a whole; after the countersunk bolt 11 fixes the forming platform 3 and the platform support plate 4, it ensures that the levelness of the forming platform 3 will not be affected.

[0049] Furthermore, there are four countersunk holes 9, which are distributed at the four corners of the forming platform 3.

[0050] Furthermore, the first bolt 8 is an internal hex bolt; internal hex bolts can be adjusted using an internal hex wrench, which is simpler and more convenient, and is suitable for the bottom of the platform support plate 4 where the operating space is small.

[0051] Further, the support frame 2 is provided with two, the L-shaped horizontal part of the support frame 2 clamps three first screw holes 5 in.

[0052] Further, the connecting plate 1 is provided with a plurality of screw holes or through holes for mounting the 3D printing equipment, and the screw holes or through holes are used for mounting the connecting plate 1 on the 3D printing equipment.

[0053] Embodiment

[0054] The principle of adjusting the flatness is that the connecting plate 1 connects the support frame 2. The platform support plate 4 is mounted on the support frame 2.

[0055] The hollow screw 6 and the first bolt 8 are opposite in screw direction, the outer thread of the hollow screw 6 is matched with the inner thread of the three holes of the platform support plate 4, and the inner hole of the hollow screw 6 is a smooth through hole; the outer thread of the first bolt 8 is matched with the inner thread of the three blind holes 7 of the forming platform 3, and the hollow screw 6 is locked. At this time, the hollow screw 6 is subjected to the upward pressure of the first bolt 8. The bottom surface of the forming platform 3 forms a clamping force by applying pressure to the upper surface of the hollow screw 6. Therefore, the downward looseness and the downward and upward looseness of the hollow screw 6 are prevented, and the positioning and limiting effects are achieved. The forming platform 3 and the platform support plate 4 are connected by four countersunk head bolts 11, which further ensure the positioning and limiting of the hollow screw 6.

[0056] According to the principle that three points determine a plane, the height of the three points is adjusted by adjusting the rotation depth of the hollow screw 6 relative to the platform support plate 4. Further, the three points are adjusted, and the angle adjustment function of the forming platform 3 is realized. The perpendicularity requirement of the upper surface of the forming platform 3 and the light source axis is realized, and the light curing printing precision is ensured.

[0057] Two-way fixing principle and stress analysis:

[0058] The first bolt 8 and the hollow screw 6 are opposite in rotation direction, and the countersunk head bolts 11 are uniformly distributed at four corners of the forming platform 3. The countersunk head bolts 11 fixedly connect the forming platform 3 and the platform support plate 4. At this time, the height and angle of the forming platform 3 have been adjusted by rotating the three hollow screws 6, and the upper end surface of the three hollow screws 6 is in contact with the circular groove of the forming platform 3,

[0059] Prevent the hollow screw 6 from loosening upward: after the first bolt 8 and the countersunk head bolt 11 lock the forming platform 3 and the forming platform support plate 4, the upper end surface of the hollow screw 6 is subjected to the downward pressure F1 of the concave surface of the forming platform 3, which prevents the hollow screw 6 from further rotating upward, as Figure 10 shown.

[0060] Prevent hollow screw 6 from loosening downward: through the reverse screw of first bolt 8 and the threaded connection with shaped platform 3, the lower end surface of hollow screw 6 is subjected to the upward thrust force F2 of first bolt 8, preventing further rotation of hollow screw 6 from loosening downward.

[0061] Chain flexible bolt locking principle and anti-assembly stress analysis:

[0062] The first bolt 8 shown in the tightening process, the second bolt chain connector 8-2 and the first bolt chain connector 8-1 connected by the bolt cap are rotated, and then the threaded bolt head is rotated and locked. In the leveling process, the maximum gap is in the middle of the ellipse of the second bolt chain connector 8-2 and the first bolt chain connector 8-1. After locking, the elastic washer 12 connects the minimum gap at both ends of the ellipse of the second bolt chain connector 8-2 and the first bolt chain connector 8-1, thereby avoiding the defect of insufficient locking of the first bolt. The connection between the bolt cap, the second bolt chain connector 8-2, the first bolt chain connector 8-1 and the bolt head can adapt to the leveling result and form a certain angle connection. Therefore, when the axis is not parallel caused by three pairs of double bolts locking, the assembly stress is avoided.

[0063] In summary, the leveling mechanism proposed by the utility model is manually adjusted, which is convenient and effectively avoids the adjustment device of the forming platform during the photocuring printing of parts being located on the upper surface and avoiding loosening of the leveling mechanism during the printing process through the bidirectional locking bolt. Therefore, it will not cause the problem of protrusion of the printed parts and the need to remove redundant materials again. The chain flexible bolt structure and the arc-shaped end feature contact avoid long-term assembly stress and part failure problems during and after leveling.

[0064] It should be emphasized that: the above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Any simple modification, equivalent change and modification of the above embodiment according to the technical essence of the utility model still belongs to the scope of the technical scheme of the utility model.

Claims

1. A light-cured platform flexible bolt leveling device that avoids creating assembly stresses, characterized in that, The utility model relates to a 3D printing device support frame, including: The support frame (2) is L type, the connecting plate (1) can be detachably connected in the upper end of the L type vertical portion of the support frame (2), the platform support plate (4) is detachably connected in the upper edge of the L type horizontal portion of the support frame (2), the forming platform (3) is rigid board, the platform support plate (4) is supported from below to above in the lower surface of the forming platform (3), The connecting plate (1) is used for fixed installation 3D printing equipment, the connecting plate (1) is installed on 3D printer, the upper surface of the forming platform (3) is used for carrying forming material and the product after printing solidification is completed, The platform support plate (4) is equipped with three first screw holes (5) of axis vertical and not in the same plane, the hollow screw (6) is screw connected in the first screw hole (5), the hollow screw (6) is cylindrical, and the end is circular arc structure, the thread on the outer circumference of the hollow screw (6) is engaged with the first screw hole (5), The lower surface of the forming platform (3) is equipped with three blind holes (7) of axis vertical, the inner circumferential wall of the blind hole (7) is equipped with thread, the blind hole (7) is corresponding with the hole position of the first screw hole (5), The first bolt (8) is screw connected in the blind hole (7), the screw rod diameter of the first bolt (8) is less than the diameter of the cylindrical inner hole of the hollow screw (6), When the hollow screw (6) spirals upward, the upper end of the hollow screw (6) pushes the lower surface of the forming platform (3) upward, when the first bolt (8) is screwed to the blind hole (7), the bolt cap of the first bolt (8) pushes the lower end of the cylindrical type of the hollow screw (6) upward.

2. The light-cured platform flexible bolt leveling device of claim 1, wherein, The thread direction of the first bolt (8) and the hollow screw (6) is opposite.

3. The photo-cured platform flexible bolt leveling device of claim 1, wherein, The hole position of the first screw hole (5) is distributed in equilateral triangle.

4. The photo-cured platform flexible bolt leveling device of claim 1, wherein, The periphery of the upper surface of the forming platform (3) is also equipped with at least three counterbores (9) of axis vertical and not in the same plane, the counterbores (9) are through holes, the upper surface of the platform support plate (4) is equipped with the second screw hole (10) of axis vertical, and the position and number of the counterbores (9) are matched, when the countersunk bolt (11) is screw connected in the second screw hole (10) through the counterbores (9), the countersunk bolt (11) detachably connects the forming platform (3) and the platform support plate (4) as a whole.

5. The photo-cured platform flexible bolt leveling device of claim 4, wherein, The counterbores (9) are four, and the counterbores (9) are distributed at the four corners of the forming platform (3).

6. The photo-cured platform flexible bolt leveling device of claim 1, wherein, The first bolt (8) is a hexagon socket head cap screw with chain flexible structure, the chain flexible structure is nested connected by the first bolt chain connecting piece (8-1) and the second bolt chain connecting piece (8-2), and there is a gap between the nested holes, so that the flexible bending function of the first bolt (8) without assembly stress can be realized.

7. The photo-cured platform flexible bolt leveling device of claim 1, wherein, The support frame (2) is two, and the L type horizontal portion of the support frame (2) clamps the three first screw holes (5) in.

8. The photo-cured platform flexible bolt leveling device of claim 1, wherein, A plurality of screw holes or through holes are arranged on the connecting plate (1), and the screw holes or through holes are used for mounting the connecting plate (1) on a 3D printing device.

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