DLP device with Z-axis release structure and release method thereof

Abstract

The application discloses a DLP device with Z-axis release structure and a release method thereof, and the DLP device comprises a Z-axis release structure, the Z-axis release structure comprises a driving assembly, a rotating assembly and a vertical guide assembly arranged on the rotating assembly; a printing assembly is matched with the vertical guide assembly at one end close to a lifting motor, the driving assembly drives the rotating assembly to rotate, and drives the vertical guide assembly to rotate around the central axis of the rotating assembly, and the vertical guide assembly drives the printing assembly to rotate around the central axis of the lifting motor. The Z-axis release structure of the application drives the rotating assembly to rotate by using the driving assembly, further drives the vertical guide assembly arranged on the rotating assembly to rotate around the central axis of the rotating assembly, so that the printing assembly rotates around the central axis of the lifting motor following the vertical guide assembly, and through the Z-axis release structure, the vertical release force generated during the up-pulling type forming is converted into a horizontal release force from the mechanical structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of additive manufacturing, and in particular to a DLP device with a Z-axis release structure and a release method thereof. BACKGROUND

[0002] The existing DLP device is divided into desktop type device and industrial large device, the industrial large device is light source on, and the forming is sunk below the liquid surface, and the liquid surface does not need release film, and the commonly used desktop type device mostly adopts light source below, and the up-pulling type forming is carried out through the window and the release film.

[0003] The existing up-pulling type forming device is prone to poor precision and surface fineness of the printed product due to release force, in order to reduce the release force to obtain higher fineness and improve the forming efficiency, the main solution is to replace the release film to reduce the release force.

[0004] Since the release film is a consumable, replacing the release film to reduce the release force leads to increased model printing cost, and the process of frequently replacing the release film also affects the printing fineness and printing efficiency, therefore, it is necessary to design a release structure capable of reducing the release force from the mechanical point of view, in the case of using the same release film, the surface fineness and printing efficiency of the printed product can be greatly improved with the help of the release structure. SUMMARY

[0005] In view of the problems that the surface fineness and printing efficiency of the printed product are low due to the influence of the release force of the existing up-pulling type forming device, and the printing cost is too high due to the frequent replacement of the release film to reduce the release force, the present application provides a DLP device with a Z-axis release structure and a release method thereof, which are used to solve the above technical problems.

[0006] According to a first aspect of the present application, a DLP device with a Z-axis release structure is provided, which comprises a device main body, a material tank and a lifting printing mechanism detachably installed on a reference plate at the upper part of the device main body, the lifting printing mechanism comprises a printing assembly and a lifting motor driving the lifting of the printing assembly; and further comprises a Z-axis release structure, the Z-axis release structure comprises a driving assembly, a rotating assembly and a vertical guide assembly arranged on the rotating assembly; one end of the printing assembly close to the lifting motor is matched with the vertical guide assembly, the driving assembly drives the rotating assembly to rotate, and drives the vertical guide assembly to rotate around the center axis of the rotating assembly, and the vertical guide assembly drives the printing assembly to rotate around the center axis of the lifting motor.

[0007] By adopting the technical scheme, the driving assembly drives the rotating assembly to rotate, further drives the vertical guide assembly arranged on the rotating assembly to rotate around the central axis of the rotating assembly, and the printing assembly rotates with the vertical guide assembly around the central axis of the lifting motor, and the vertical direction of the stripping force generated during the upward pulling type forming is converted into a horizontal direction of the stripping force through the Z-axis stripping structure, so that the stripping force can be reduced by 30-40% without replacing the stripping film, and the surface fineness and printing efficiency of the printed product are greatly improved.

[0008] In some specific embodiments, the printing assembly includes a printing platform arranged above the trough, the printing platform is detachably connected with one end of the platform extension plate, the other end of the platform extension plate is connected with the fixed plate, and the fixed plate is rotatably connected with the lifting motor.

[0009] By adopting the technical scheme, the printing platform, the platform extension plate and the fixed plate are detachably connected, so that the printing assembly has a modular structure, assembly and disassembly are facilitated, and the convenience of maintenance and replacement of parts is improved, the printing assembly is rotatably connected with the lifting motor through the fixed plate, and the lifting motor drives the lifting of the printing assembly.

[0010] In some specific embodiments, the lifting motor includes a power part and a lead screw part, the lead screw part vertically penetrates the reference plate and the fixed plate, and the power part is fixed to the lower surface of the reference plate.

[0011] By adopting the technical scheme, the power part is fixed to the lower surface of the reference plate, the space of the equipment is effectively utilized, the overall structure of the equipment is more compact, the verticality and precision of the lifting movement are ensured by using the vertically upward arranged lead screw motor, the printing error caused by inclination or deviation is reduced, and the uniformity and consistency of the printed layer are ensured.

[0012] In some specific embodiments, the lead screw part penetrates a lead screw nut, and the lead screw nut is fixed to the groove on the bottom surface of the fixed plate.

[0013] By adopting the technical scheme, the lead screw nut is connected with the lead screw part of the lifting motor, so that the lifting motor can drive the printing assembly to move up and down along the lead screw part through the cooperation of the lead screw nut and the fixed plate.

[0014] In some specific embodiments, the vertical guide assembly includes a guide rail guard plate vertically arranged on the rotating assembly, a vertical guide rail is fixed to the inner side of the guide rail guard plate, and the vertical sliding block of the vertical guide rail is connected with the side of the fixed plate away from the platform extension plate.

[0015] By adopting the technical scheme, the guide rail guard plate is vertically arranged on the rotating assembly, so that the vertical guide assembly as a whole can rotate with the rotating assembly, the fixed plate is driven to move by the vertical sliding block, and the fixed plate only rotates around the central shaft of the lifting motor due to the fact that the fixed plate is penetrated by the screw rod of the lifting motor, thereby further driving the printing platform to rotate.

[0016] In some specific embodiments, a limit switch is further arranged above the vertical guide rail, and a limit switch plate is mounted on the top of the fixed plate and cooperates with the limit switch.

[0017] By adopting the technical scheme, when the fixed plate moves to the highest position of the vertical guide rail along with the vertical sliding block, the limit switch plate cooperates with the limit switch to prevent the printing assembly from over-traveling upward, so that accidents can be prevented, the safety of equipment operation is improved, and the upper limit position of the printing assembly can be accurately positioned.

[0018] In some specific embodiments, the rotating assembly includes a rotating disc and a rotating base arranged above and below the reference plate respectively, the upper surface of the reference plate is provided with a rotating groove matched with the rotating disc, and a through hole is arranged in the center of the rotating groove and matched with the rotating base.

[0019] By adopting the technical scheme, the rotating disc can stably rotate in the rotating groove, the shaking and instability factors in the rotating process are reduced, the stability and precision of the rotating disc are improved, the rotating disc and the rotating base are accurately aligned by means of the through hole in the center of the rotating groove, the cooperation of the two simplifies the structure of the rotating assembly, and the installation and maintenance are easier, meanwhile, the space utilization is optimized, the equipment realizes efficient rotation in limited space on the premise of maintaining the stability of the rotating assembly.

[0020] In some specific embodiments, the rotating base includes an inner ring and an outer ring, a rotating bearing is arranged between the inner ring and the outer ring, and the inner ring and the outer ring are matched with the rotating disc and the reference plate respectively.

[0021] By adopting the technical scheme, the rotating bearing makes the rotation of the rotating disc more smooth, reduces the energy loss and mechanical wear, can significantly prolong the service life of the rotating assembly, reduces the frequency of maintenance and replacement, the high-quality rotating bearing can effectively reduce the noise and vibration in the rotating process, and improves the stability and quietness of the equipment operation.

[0022] In some specific embodiments, the driving assembly includes a steering engine, a steering engine disc and a swing rod, the steering engine is fixed to the lower surface of the reference plate, the output end of the steering engine penetrates the reference plate and cooperates with the steering engine disc, and the two ends of the swing rod are rotationally connected with the rotating assembly and the steering engine disc respectively.

[0023] By adopting the technical scheme, precise angle control is provided by the steering engine, the rotating assembly is driven by the swing rod to rotate precisely, the steering engine has the characteristic of fast response, and through the cooperation of the steering engine rotating disc and the swing rod, fast motion control can be realized, the working efficiency of the equipment is improved, and the structural layout of the equipment is optimized.

[0024] According to a second aspect of the present application, a releasing method is provided, using the DLP equipment with the Z-axis releasing structure, comprising:

[0025] S1: the equipment body projects a required image to the bottom layer of the tank, and cures the resin liquid in the bottom layer of the tank;

[0026] S2: after curing, the steering engine drives the steering engine rotating disc to rotate by 90 degrees, the steering engine rotating disc drives the swing rod to move, the swing rod applies a force to the rotating disc, and drives the rotating disc to rotate by 15 degrees;

[0027] S3: the rotating disc drives the vertical guide assembly to rotate around the center axis of the rotating disc, and then drives the printing assembly to rotate around the center axis of the rotating disc;

[0028] S4: the printing platform of the printing assembly is peeled off from the printing completed layer on the releasing film on the printing platform by the rotating releasing force generated by rotation;

[0029] S5: the lifting motor drives the printing assembly to ascend along the vertical guide assembly, the resin liquid at the bottom of the tank is filled to the middle and leveled, the steering engine is moved again to return to the initial position, drives the printing assembly to reset to the initial position, and then descends to the required height, and the steps of S1-S4 are repeated until a complete three-dimensional model is formed.

[0030] By adopting the technical scheme, whenever a layer of the printing model is cured, the steering engine drives the steering engine rotating disc to rotate, further drives the rotating disc to rotate through the swing rod linkage, the vertical guide assembly arranged on the rotating disc moves with the rotating disc, the printing assembly rotates around the center axis of the rotating disc and generates the rotating releasing force of transverse circular motion due to the cooperation of the vertical guide assembly and the printing assembly, the printing completed layer on the releasing film on the printing platform is peeled off by the releasing force, the lifting motor lifts the printing assembly after peeling, the resin in the tank is filled to the middle and leveled, the steering engine drives the printing assembly to reset, and then the lifting motor drives the printing platform to descend to print the next layer of model, the printing completed layer is peeled off by the transverse circular rotating releasing force through the method, compared with the traditional pulling type releasing, the releasing force required for peeling the printing layer is greatly reduced, the service life of the releasing film is prolonged, and the cost of consumables is reduced.

[0031] Compared with the prior art, the present application has the following beneficial effects:

[0032] The application mainly solves the problems of the existing technology, such as the low surface fineness and printing efficiency of the printing product caused by the release force of the up-pulling type forming equipment, and the high printing cost caused by the frequent replacement of the release film to reduce the release force. The application provides a DLP equipment with a Z-axis release structure and a release method thereof. The Z-axis release structure composed of a driving assembly, a rotating assembly and a vertical guide assembly is used to change the traditional up-pulling release method into a horizontal rotating release, thereby greatly reducing the release force required when the completed layer is released, about 30-40%. When releasing, the rotating assembly is driven by the rudder through the swing rod, and then the vertical guide assembly and the printing assembly are rotated in linkage. The completed layer is peeled off from the release film under the action of the horizontal rotating release force, thereby solving the problems of the large release force required by the up-pulling release and the large loss of the release film from the perspective of the mechanical structure. BRIEF DESCRIPTION OF DRAWINGS

[0033] The accompanying drawings are included to provide a further understanding of embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and, together with the description, serve to explain the principles of the application. Other embodiments and many of the intended advantages of the present application will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings. The elements of the drawings are not necessarily to scale relative to each other. Like reference numerals designate corresponding similar parts.

[0034] Figure 1 is a structural schematic diagram of a DLP equipment according to an embodiment of the application;

[0035] Figure 2 is an installation schematic diagram of a lifting printing mechanism according to one specific embodiment of the application;

[0036] Figure 3 is a schematic diagram of a Z-axis release structure according to one specific embodiment of the application;

[0037] Figure 4 is a release method flowchart according to an embodiment of the application.

[0038] Meaning of each number in the figure:

[0039] The device body 01, the reference plate 02, the rotating groove 021, the material groove 03, the printing assembly 04, the printing platform 041, the platform extension plate 042, the fixed plate 043, the lifting motor 05, the power part 051, the screw part 052, the screw nut 053, the Z-axis release structure 06, the driving assembly 07, the steering wheel 071, the steering wheel rotating disc 072, the swing rod 073, the rotating assembly 08, the rotating disc 081, the rotating base 082, the inner ring 083, the outer ring 084, the rotating bearing 085, the vertical guide assembly 09, the guide rail guard plate 091, the vertical guide rail 092, the vertical sliding block 093, the limit switch 094, the limit switch plate 095, and the quartz glass 10. DETAILED DESCRIPTION

[0040] In the following detailed description, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration specific embodiments in which the application can be practiced. In this regard, directional terminology, such as "top," "bottom," "left," "right," "above," "below," and the like, is used with reference to the orientation of the Figure(s) being described. Because components of embodiments can be positioned in a number of different orientations, the directional terminology is used for purposes of illustration and is in no way limiting. It is to be understood that other embodiments can be utilized and structural or logical changes can be made without departing from the scope of the present application. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the application is defined by the appended claims.

[0041] According to the first aspect of the present application, a DLP device with a Z-axis release structure is provided, comprising a device body 01, and a material groove 03 and a lifting printing mechanism detachably installed on the reference plate 02 at the upper part of the device body 01, the lifting printing mechanism comprising a printing assembly 04 and a lifting motor 05 driving the printing assembly 04 to lift; further comprising a Z-axis release structure 06, the Z-axis release structure 06 comprising a driving assembly 07, a rotating assembly 08, and a vertical guide assembly 09 arranged on the rotating assembly 08; the printing assembly 04 is matched with the vertical guide assembly 09 at one end close to the lifting motor 05, the driving assembly 07 drives the rotating assembly 08 to rotate, and drives the vertical guide assembly 09 to rotate around the center axis of the rotating assembly 08, and the vertical guide assembly 09 drives the printing assembly 04 to rotate around the center axis of the lifting motor 05.

[0042] Specifically, the driving assembly 07 drives the rotating assembly 08 to rotate, further driving the vertical guide assembly 09 arranged on the rotating assembly 08 to rotate around the center axis of the rotating assembly 08, so that the printing assembly 04 rotates around the center axis of the lifting motor 05 with the vertical guide assembly 09, and through the Z-axis release structure 06, the vertical direction release force generated during the up-pulling forming is converted into a horizontal release force from the mechanical structure, which can reduce the release force by 30-40% without replacing the release film, greatly improving the surface fineness and printing efficiency of the printed product.

[0043] Figure 2 The installation schematic diagram of the lifting printing mechanism according to one specific embodiment of the present application is shown in FIG. 1. Figures 1-2 As shown in FIG. 1, the printing assembly 04 comprises a printing platform 041 arranged above the vat 03, the printing platform 041 is detachably connected with one end of a platform extension plate 042, the other end of the platform extension plate 042 is connected with a fixed plate 043, and the fixed plate 043 is rotatably connected with the lifting motor 05.

[0044] By using the detachably connected printing platform 041, platform extension plate 042 and fixed plate 043, the printing assembly 04 has a modular structure, which is convenient for assembly and disassembly, and improves the convenience of maintenance and replacement of parts. The printing assembly is rotatably connected with the lifting motor 05 through the fixed plate 043, so that the lifting motor 05 drives the lifting of the printing assembly 04.

[0045] In a specific embodiment, the vat 03 is installed on the reference plate 02 by means of a press buckle and a bolt, and the reference plate 02 is provided with a quartz glass 10 for projecting a printing image at the center of the vat 03.

[0046] In a specific embodiment, the lifting motor 05 comprises a power part 051 and a lead screw part 052, the lead screw part 052 vertically penetrates the reference plate 02 and the fixed plate 043, and the power part 051 is fixed on the lower surface of the reference plate 02. By fixing the power part 051 on the lower surface of the reference plate 02, the space of the equipment is effectively utilized, the overall structure of the equipment is more compact, and the verticality and precision of the lifting movement are ensured by using the vertically upward arranged lead screw motor, which reduces the printing error caused by inclination or deviation, thereby ensuring the uniformity and consistency of the printing layer.

[0047] Further, the lead screw part 052 penetrates a lead screw nut 053, and the lead screw nut 053 is fixed on the groove on the bottom surface of the fixed plate 043. By using the cooperation between the lead screw nut 053 and the lead screw part 052 of the lifting motor 05, the lifting motor 05 can drive the printing assembly 04 to move up and down along the lead screw part 052 by the cooperation between the lead screw nut 053 and the fixed plate 043.

[0048] Figure 3 The schematic diagram of the Z-axis off-type structure according to one specific embodiment of the present application is shown in FIG. 2. Figures 1-3 As shown in FIG. 2, the vertical guide assembly 09 comprises a guide rail guard plate 091 vertically arranged on the rotating assembly 08, the inner side of the guide rail guard plate 091 is fixed with a vertical guide rail 092, and the side of the fixed plate 043 away from the platform extension plate 042 is connected with a vertical sliding block 093 of the vertical guide rail 092.

[0049] Specifically, the bottom of the guide rail guard plate 091 is provided with a threaded hole, and is fixed on the upper surface of the rotating assembly 08 by means of bolts. By vertically arranging the guide rail guard plate 091 on the rotating assembly 08, the vertical guide assembly 09 as a whole can rotate with the rotating assembly 08. The vertical sliding block 093 drives the fixed plate 043 to move, and at the same time, the fixed plate 043 rotates only around the central axis of the lifting motor 05 because the screw rod part 052 of the lifting motor 05 penetrates through the fixed plate 043, further driving the printing platform 041 to rotate.

[0050] In a specific embodiment, a limit switch 094 is further arranged above the vertical guide rail 092, and a limit switch plate 095 cooperating with the limit switch 094 is mounted on the top of the fixed plate 043. When the fixed plate 043 moves to the highest position of the vertical guide rail 092 with the vertical sliding block, the limit switch plate 095 cooperates with the limit switch 094 to prevent the printing assembly 04 from over-traveling when it rises, which can prevent accidents and improve the safety of equipment operation. At the same time, it can also accurately position the upper limit position of the printing assembly 04.

[0051] In a specific embodiment, the rotating assembly 08 includes a rotating disc 081 and a rotating base 082 arranged above and below the reference plate 02 respectively. The upper surface of the reference plate 02 is provided with a rotating groove 021 matching the shape and size of the rotating disc 081, and a through hole is arranged in the center of the rotating groove 021 for the rotating disc 081 to penetrate through and cooperate with the rotating base 082. The rotating disc 081 can rotate smoothly in the rotating groove 021, reducing the shaking and instability factors in the rotation process, improving the stability and precision of the rotating disc 081 rotation. The through hole in the center of the rotating groove 021 makes the rotating disc 081 and the rotating base 082 accurately aligned, and the cooperation of the two simplifies the structure of the rotating assembly, making installation and maintenance easier. At the same time, this up-down design optimizes the space utilization, enabling the equipment to realize efficient rotation function in limited space while maintaining the stability of the rotating assembly 08.

[0052] Further, the rotating base 082 includes an inner ring 083 and an outer ring 084, and a rotating bearing 085 is arranged between the inner ring 083 and the outer ring 084. The inner ring 083 and the outer ring 084 cooperate with the rotating disc 081 and the reference plate 02 respectively. Specifically, the middle part of the rotating disc 081 penetrates through the through hole of the rotating groove 021 and cooperates with the inner ring 083 through bolts, and the outer ring 084 is fixed on the lower surface of the reference plate 02 through bolts. The inner ring 083 can rotate in the outer ring 084 by means of the rotating bearing 085, which makes the rotation of the rotating disc 081 more smooth, reduces energy loss and mechanical wear, and can significantly prolong the service life of the rotating assembly 08, reduce the frequency of maintenance and replacement, and high-quality rotating bearing 085 can effectively reduce the noise and vibration in the rotation process, improve the stability and quietness of the equipment operation.

[0053] In some specific embodiments, the driving assembly 07 comprises a steering engine 071, a steering engine turntable 072 and a swing rod 073, the steering engine 071 is fixed on the lower surface of the reference plate 02, and the output end of the steering engine 071 penetrates through the reference plate 02 and cooperates with the steering engine turntable 072, the two ends of the swing rod 073 are rotationally connected with the rotating assembly 08 and the steering engine turntable 072 respectively, specifically, the two ends of the swing rod 073 are rotationally connected with the eccentric position on the upper surface of the turntable 081 and the steering engine turntable 072 respectively, precise angle control is provided by the steering engine 071, the rotating assembly 08 is driven by the swing rod 073 to rotate accurately, the steering engine 071 has the characteristics of fast response, and through the cooperation of the steering engine 071, the steering engine turntable 072 and the swing rod 073, fast motion control can be realized, the working efficiency of the equipment is improved, and the structural layout of the equipment is optimized.

[0054] Further, the diameter of the steering engine turntable 072 is much smaller than the diameter of the turntable 081, the steering engine 071 is used to control the steering engine turntable 072 to rotate by 90 degrees, and the turntable 081 is driven by the swing rod 073 to rotate by 15 degrees, the vertical guide assembly 09 rotates with the turntable 081, due to the cooperation of the vertical sliding block 093 and the fixed plate 043, one end of the printing assembly 04 close to the fixed plate 043 rotates with the vertical guide assembly 09, and due to the fact that the fixed plate 043 is penetrated by the lifting motor 05, the printing assembly 04 rotates as a whole around the central axis of the lifting motor 05, so that the printing platform 041 generates horizontal rotation release force, and the printed completed layer of the printing model is more easily peeled off from the release film of the printing platform 041.

[0055] According to a second aspect of the present application, a release method is provided, which uses the DLP equipment with Z-axis release structure described above, Figure 4 A release method flow chart according to an embodiment of the present application is shown, as shown in the figure, the release method comprises:

[0056] S1: the equipment body projects the required image to the bottom layer of the tank, and cures the resin liquid of the bottom layer of the tank;

[0057] S2: after the curing is completed, the steering engine drives the steering engine turntable to rotate by 90 degrees, the steering engine turntable drives the swing rod to move, the swing rod applies force to the turntable, and drives the turntable to rotate by 15 degrees;

[0058] S3: the turntable drives the vertical guide assembly to rotate around the central axis of the turntable, and then the printing assembly rotates around the central axis of the turntable;

[0059] S4: the printing platform of the printing assembly peels off the printed completed layer on the release film of the printing platform by means of the rotation release force generated by the rotation;

[0060] S5: The lifting motor drives the printing assembly to rise along the vertical guide assembly, the resin liquid at the bottom of the trough fills and levels the liquid surface in the middle, the steering engine moves again to restore the initial position, driving the printing assembly to reset to the initial position, and then descending to the required height, repeating the steps of S1-S4 until the complete three-dimensional model is formed.

[0061] Using the above method, whenever a layer of the printing model is completed, the steering engine drives the steering engine turntable to rotate, further rotating the turntable through the swing rod linkage, so that the vertical guide assembly arranged on the turntable moves with the turntable. Due to the cooperation of the vertical guide assembly and the printing assembly, the printing assembly rotates around the center axis of the turntable and generates a rotational peeling force of lateral circumference, which peels off the completed printing layer on the release film on the printing platform. After peeling, the lifting motor lifts the printing assembly, the resin in the trough fills and levels the liquid surface in the middle, and after the steering engine resets the printing assembly, the lifting motor drives the printing platform to descend to print the next layer of the model. By this method, the completed printing layer is peeled off by the rotational peeling force of lateral circumference, which greatly reduces the peeling force required for printing layer peeling compared with the traditional pull-up peeling, and also prolongs the service life of the release film and reduces the cost of consumables.

[0062] The present application mainly solves the problems of low printing product surface fineness and printing efficiency, and high printing cost caused by frequent replacement of release film due to the influence of peeling force on the existing pull-up forming equipment. The present application proposes a DLP equipment with Z-axis peeling structure and a peeling method thereof, which converts the traditional pull-up peeling method into a horizontal rotational peeling by using the Z-axis peeling structure 06 composed of a driving assembly 07, a rotating assembly 08, and a vertical guide assembly 09, greatly reducing the peeling force required for peeling the completed printing layer by about 30-40%. During peeling, the steering engine 071 drives the rotating assembly 08 through the swing rod 073, and then links the vertical guide assembly 09 and the printing assembly 04 to rotate, so that the completed printing layer is peeled off from the release film under the action of the horizontal rotational peeling force. From the perspective of mechanical structure, the problems of large peeling force and large release film loss of the pull-up peeling are solved.

[0063] Obviously, those skilled in the art can make various modifications and changes to the embodiments of the present application without departing from the spirit and scope of the present application. In this way, if these modifications and changes are within the scope of the claims of the present application and their equivalents, the present application also intends to cover these modifications and changes. The word "comprising" does not exclude the presence of other elements or steps not listed in the claims. The simple fact that certain measures are described in mutually different dependent claims does not mean that combinations of these measures cannot be used to advantage. Any reference signs in the claims should not be considered as limiting the scope.

Claims

1. A DLP device with Z-axis off-type structure, comprising a device main body, a material tank and a lifting printing mechanism which are detachably installed on the reference plate at the upper part of the device main body, characterized in that, The lifting printing mechanism comprises a printing assembly and a lifting motor for driving the lifting of the printing assembly; the printing assembly comprises a printing platform arranged above the tank, one end of the printing platform is detachably connected with a platform extension plate, the other end of the platform extension plate is connected with a fixed plate, the fixed plate is rotationally connected with the lifting motor; further comprising a Z-axis release structure, the Z-axis release structure comprises a driving assembly, a rotating assembly, and a vertical guide assembly arranged on the rotating assembly; the rotating assembly comprises a rotating disc and a rotating base arranged above and below the reference plate respectively, the upper surface of the reference plate is provided with a rotating groove matched with the rotating disc, and a through hole is formed in the center of the rotating groove for the rotating disc to pass through and be connected with the rotating base; the rotating base comprises an inner ring and an outer ring, a rotating bearing is arranged between the inner ring and the outer ring, and the inner ring and the outer ring are connected with the rotating disc and the reference plate respectively; the driving assembly comprises a rudder, a rudder disc and a swing rod, the rudder is fixed on the lower surface of the reference plate, the output end of the rudder passes through the reference plate and is connected with the rudder disc, and the two ends of the swing rod are rotationally connected with the rotating assembly and the rudder disc respectively; one end of the printing assembly close to the lifting motor is connected with the vertical guide assembly, the driving assembly drives the rotation of the rotating assembly and drives the vertical guide assembly to rotate around the central axis of the rotating assembly, and the vertical guide assembly drives the printing assembly to rotate around the central axis of the lifting motor.

2. The DLP device with Z-axis detaching structure according to claim 1, wherein, The lifting motor comprises a power part and a screw rod part, the screw rod part vertically passes through the reference plate and the fixed plate, and the power part is fixed on the lower surface of the reference plate.

3. The DLP device with Z-axis detaching structure according to claim 2, wherein, A screw rod nut is arranged on the screw rod part, and the screw rod nut is fixed on the groove on the bottom surface of the fixed plate.

4. The DLP device with Z-axis detaching structure of claim 1, wherein, The vertical guide assembly comprises a guide rail guard plate vertically arranged on the rotating assembly, a vertical guide rail is fixed on the inner side of the guide rail guard plate, and the vertical sliding block of the vertical guide rail is connected with the side of the fixed plate away from the platform extension plate.

5. The DLP device with Z-axis detaching structure according to claim 4, wherein, A limit switch is arranged above the vertical guide rail, and a limit switch plate matched with the limit switch is arranged on the top of the fixed plate.

6. A method of lift-off, using a DLP apparatus with a Z-axis lift-off structure according to any one of claims 1-5, characterized in that, It comprises: S1: the device body projects the required image to the bottom layer of the tank, and solidifies the resin liquid in the bottom layer of the tank; S2: after solidification, the rudder drives the rudder disc to rotate by 90 degrees, the rudder disc drives the swing rod to move, the swing rod applies a force to the rotating disc, and the rotating disc rotates by 15 degrees; S3: the rotating disc drives the vertical guide assembly to rotate around the central axis of the rotating disc, and the printing assembly rotates around the central axis of the rotating disc; S4: the printing platform of the printing assembly is peeled off from the printing completed layer on the release film on the printing platform by the rotation release force generated by rotation. S5: the lifting motor drives the printing assembly to ascend along the vertical guide assembly, the resin liquid at the bottom of the trough fills and levels the liquid surface, the steering engine moves again to restore to the initial position, drives the printing assembly to reset to the initial position, and then descends to the required height, and the steps of S1-S4 are repeated until a complete three-dimensional model is formed.

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