阅读说明：本技术 一种3d打印机的组件dlp光学引擎的支撑结构 (Supporting structure of DLP optical engine of assembly of 3D printer ) 是由 朱协彬 余小鲁 朱先琦 王志俊 张东坤 孙楠 苏大龙 于 2020-12-09 设计创作，主要内容包括：本发明公开了一种3D打印机的组件DLP光学引擎的支撑结构,属于3D打印机领域,包括用于安装组件DLP光学引擎的光学引擎壳体,光学引擎壳体的上方中部通过第一轴承连接有竖直设置并贯穿工作台壳体的成像调节螺杆,工作台壳体上端面上开设有供成像调节螺杆穿过并与其螺纹适配的第一螺纹孔；光学引擎壳体的一侧设有与组件DLP光学引擎中的LED光源串联的第一滑动变阻器,第一滑动变阻器上的第一滑块通过连接板与光学引擎壳体固定连接；光学引擎壳体的底部设置支撑气囊,光学引擎壳体的上方设置与支撑气囊连通的气压缸。本发明具有调节3D打印产品规格的功能,并能较好的调控光照强度,且相关结构的移动稳定性较好。(The invention discloses a support structure of a component DLP optical engine of a 3D printer, belonging to the field of 3D printers and comprising an optical engine shell for mounting the component DLP optical engine, wherein the middle part above the optical engine shell is connected with an imaging adjusting screw rod which is vertically arranged and penetrates through a workbench shell through a first bearing, and the upper end surface of the workbench shell is provided with a first threaded hole for the imaging adjusting screw rod to pass through and be matched with the thread of the imaging adjusting screw rod; a first slide rheostat connected with an LED light source in the DLP optical engine in series is arranged on one side of the optical engine shell, and a first slide block on the first slide rheostat is fixedly connected with the optical engine shell through a connecting plate; the bottom of the optical engine shell is provided with a supporting air bag, and a pneumatic cylinder communicated with the supporting air bag is arranged above the optical engine shell. The three-dimensional adjustable three-dimensional printing machine has the function of adjusting the specification of a 3D printing product, can well regulate and control the illumination intensity, and has good movement stability of a related structure.)

1. A support structure for a component DLP optical engine of a 3D printer comprises a table housing (9) for receiving the component DLP optical engine, a light output port (1) is arranged on one side of the upper end surface of the workbench shell (9), characterized in that an optical engine shell (14) for installing a DLP optical engine is arranged in the workbench shell (9), one end of the optical engine shell (14) is provided with an opening which is opposite to the light output port (1), the middle part above the optical engine shell (14) is connected with an imaging adjusting screw rod (4) which is vertically arranged and penetrates through the top of the workbench shell (9), a first threaded hole (20) for the imaging adjusting screw rod (4) to pass through and be matched with the thread of the imaging adjusting screw rod is arranged on the upper end surface of the workbench shell (9), the lower end of the imaging adjusting screw rod (4) is rotatably connected with the optical engine shell (14) through a first bearing (21);

a first slide rheostat (12) electrically connected with an LED light source (22) in the DLP optical engine is arranged in the workbench shell (9), the first slide rheostat (12) is vertically arranged on one side of the optical engine shell (14), an upper fixing plate (8) horizontally connected to the inner side wall of the workbench shell (9) is fixed at the upper end of the first slide rheostat (12), a lower fixing plate (11) horizontally connected to the inner side wall of the workbench shell (9) is fixed at the lower end of the first slide rheostat (12), and a first sliding block (24) on the first slide rheostat (12) is fixedly connected with the optical engine shell (14) through a connecting plate (6); the first slider (24) moves downward, and the resistance value of the first slide rheostat (12) becomes smaller.

2. The support structure of the DLP optical engine of the 3D printer according to claim 1, wherein one side of the first slide rheostat (12) is provided with a second slide rheostat (10) which is vertically arranged, the upper end and the lower end of the second slide rheostat (10) are respectively and correspondingly and fixedly connected with the upper fixing plate (8) and the lower fixing plate (11), the second slide rheostat (10) is electrically connected with the first slide rheostat (12) in parallel, the second slider (27) of the second slide rheostat (10) is connected with a light intensity adjusting screw (7) which vertically extends upwards and penetrates through the top of the workbench housing (9), the upper end surface of the workbench housing (9) is provided with a second threaded hole (25) through which the light intensity adjusting screw (7) penetrates and is matched with the thread of the second threaded hole, the upper fixing plate (8) is provided with a through hole through which the light intensity adjusting screw (7) penetrates, the lower end of the light intensity adjusting screw rod (7) is rotatably connected with a second sliding block (27) through a second bearing (26), the second sliding block (27) moves downwards, and the resistance value of the second slide rheostat (10) is reduced.

3. The support structure of the DLP optical engine of the 3D printer assembly according to claim 2, wherein one side of the lower part of the first slide rheostat (12) and the second slide rheostat (10) is provided with a limiting strip (23) for limiting the first sliding block (24) or the second sliding block (27).

4. The support structure of the DLP optical engine as a component of a 3D printer as claimed in any one of claims 1 to 3, wherein a vertically arranged pneumatic cylinder (3) is fixed at the inner top of the workbench housing (9), a piston plate with a periphery completely attached to the inner wall of the pneumatic cylinder (3) is arranged in the pneumatic cylinder (3), a piston rod (19) which vertically faces downwards and is fixedly connected with the optical engine housing (14) is fixed on the lower end surface of the piston plate, a support air bag (15) fixed at the inner bottom of the workbench housing (9) is connected to the bottom of the optical engine housing (14), an air nozzle (16) is connected to one side of the support air bag (15), and a vent pipe (18) communicated with the air nozzle (16) is connected to the upper end of one side of the pneumatic cylinder (3).

5. The support structure of the DLP optical engine of the 3D printer component according to claim 4, characterized in that two ends of the optical engine housing (14) are respectively formed with two convex parts, one of which is located right below the light output port (1), and two first limit blocks (2) which are located at two opposite sides of the light output port (1) and clamped at two sides of the corresponding convex part are fixed at the inner top of the workbench housing (9); and an LED light source (22) is arranged inside the other protruding part, and two second limiting blocks (5) clamped at two sides of the corresponding protruding part are fixed at the inner top of the workbench shell (9).

6. The DLP optical engine supporting structure of 3D printer assembly according to claim 4, wherein two horizontal side guide plates (13) are fixed on two opposite sides of the bottom of the optical engine housing (14), and two guide rods (17) respectively penetrating through the corresponding side guide plates (13) are vertically fixed on the inner bottom of the workbench housing (9).

Technical Field

The invention relates to the field of 3D printers, in particular to a support structure of a DLP optical engine of a component of a 3D printer.

Background

3D printing belongs to a rapid prototyping technology, and three-dimensional entities are manufactured on the basis of digital model files. 3D printers have long been moving out of science fiction novels to become a realistic product. Astronauts can use it to print devices temporarily needed in the capsule; the designer can use it to create a model of the design at home; the dental hospital can be used for privately customizing the 3D printer for the teeth of a patient, is widely applied to various fields, and gradually enters the daily life of people. The 3D printing techniques include FDM fused deposition modeling techniques, SLA stereolithography techniques, DLP modeling techniques, and the like. The DLP molding technology uses a high-resolution Digital Light Processor (DLP) optical engine to solidify liquid photopolymer, and light solidification is carried out layer by layer, and each layer is solidified through slide-like sheet-shaped solidification, so that the speed is high.

At present, the 3D printer of current utilization DLP forming technology, DLP forming technology mainly relies on subassembly DLP optical engine to realize, subassembly DLP optical engine mainly includes light source array, a controller, the DMD chip etc. the light that light source array sent is on the DMD chip, the DMD chip includes tens of thousands little mirrors, the little mirror work of corresponding position on controlling the DMD chip through the controller will receive light reflection away, other little mirrors do not reflect light, the light spot that the little mirror that plays the reflex action reflects comes combines a pattern, this part light shines to the silo in, can make partial resin solidify, form corresponding one deck pattern, high frequency conversion is to the control of DMD chip, and the cooperation is used for bearing the lift control of the support plate of product, can realize utilizing 3D of DLP forming technology to print. But this equipment is all through control assembly DLP optical engine adjusting 3D prints the product specification, and it is comparatively loaded down with trivial details to control, and its assembly DLP optical engine's bearing structure does not have the function of adjusting 3D and printing the product specification, and can not better regulation and control illumination intensity.

Disclosure of Invention

1. Technical problem to be solved

The technical problem to be solved by the invention is to provide a support structure of a DLP optical engine of a component of a 3D printer, which has the function of adjusting the specification of a 3D printing product, can well regulate and control the illumination intensity, and has good movement stability of a related structure.

2. Technical scheme

In order to solve the problems, the invention adopts the following technical scheme:

a supporting structure of a component DLP optical engine of a 3D printer comprises a workbench shell for accommodating the component DLP optical engine, wherein one side of the upper end surface of the workbench shell is provided with a light output port; an optical engine shell used for installing a DLP optical engine is arranged in the workbench shell, an opening facing a light output port is formed in one end of the optical engine shell, an imaging adjusting screw rod which is vertically arranged and penetrates through the top of the workbench shell is connected to the middle of the upper portion of the optical engine shell, a first threaded hole for the imaging adjusting screw rod to penetrate through and is in threaded fit with the imaging adjusting screw rod is formed in the upper end face of the workbench shell, and the lower end of the imaging adjusting screw rod is rotatably connected with the optical engine shell through a first bearing;

a first slide rheostat electrically connected with an LED light source in the DLP optical engine is arranged in the workbench shell, the first slide rheostat is vertically arranged on one side of the optical engine shell, an upper fixing plate horizontally connected to the inner side wall of the workbench shell is fixed at the upper end of the first slide rheostat, a lower fixing plate horizontally connected to the inner side wall of the workbench shell is fixed at the lower end of the first slide rheostat, and a first sliding block on the first slide rheostat is fixedly connected with the optical engine shell through a connecting plate; the first slider moves downward, and the resistance value of the first slide rheostat becomes small.

As an improvement to the above scheme, a second slide rheostat is vertically arranged on one side of the first slide rheostat, the upper end and the lower end of the second slide rheostat are respectively and fixedly connected with the upper fixing plate and the lower fixing plate correspondingly, the second slide rheostat is electrically connected with the first slide rheostat in parallel, a second slider of the second slide rheostat is connected with a light intensity adjusting screw rod which vertically extends upwards and penetrates through the top of the workbench shell, a second threaded hole through which the light intensity adjusting screw rod penetrates and is matched with the thread of the light intensity adjusting screw rod is formed in the upper end face of the workbench shell, a through hole through which the light intensity adjusting screw rod penetrates is formed in the upper fixing plate, the lower end of the light intensity adjusting screw rod is rotatably connected with the second slider through a second bearing, the second slider moves downwards, and the resistance value of the second slide rheo. The light intensity adjusting screw rod can perform lifting movement by rotating the light intensity adjusting screw rod and matching with the action of the second threaded hole, and the second sliding block can not rotate along with the light intensity adjusting screw rod but perform lifting movement along with the light intensity adjusting screw rod due to the arrangement of the second bearing, so that the vertical movement adjustment of the second sliding block can be realized; the second slide rheostat is connected with the first slide rheostat in parallel and then connected with the LED light source in series, the currents LED to the LED light source can be controlled through the two slide rheostats respectively, and the second slide rheostat can adjust the current on the corresponding branch circuit through manual control under the condition that the height position of the optical engine shell is not influenced, so that the light intensity of the LED light source can be adjusted in an auxiliary mode.

Furthermore, one side of the lower part of the first slide rheostat and the second slide rheostat is provided with a limiting strip for limiting the first slide block or the second slide block. The limiting strip can limit the lowest point of the corresponding sliding block moving downwards, so that the resistance value of the sliding rheostat can be prevented from being too small, namely, the current passing through the LED light source is prevented from being too large.

As the further improvement to above-mentioned scheme, the interior top of workstation casing is fixed with the pneumatic cylinder of vertical setting, be equipped with the peripheral complete attached piston board rather than the inner wall in the pneumatic cylinder, and be fixed with vertical downwards and with optical engine casing fixed connection's piston rod on the lower terminal surface of piston board, optical engine casing's bottom is connected with the support gasbag of fixing the bottom in the workstation casing, one side of supporting the gasbag is connected with the air cock, one side upper end of pneumatic cylinder is connected with the breather pipe with the air cock intercommunication. When the optical engine shell moves upwards, the piston rod can be driven to move upwards, so that gas in the pneumatic cylinder can be extruded out, and the part of gas is filled into the supporting air bag through the vent pipe, so that the supporting air bag is expanded, the rising optical engine shell can be supported, and the stability of the optical engine shell is enhanced.

Furthermore, two ends of the optical engine shell respectively form a protruding part, one protruding part is positioned right below the light output port, and two first limiting blocks which are positioned on two opposite sides of the light output port and clamped on two sides of the corresponding protruding part are fixed at the inner top of the workbench shell; and an LED light source is arranged inside the other protruding part, and two second limiting blocks clamped on two sides of the corresponding protruding part are fixed at the inner top of the workbench shell. The first limiting block and the second limiting block can limit the position of the protruding part of the optical engine shell respectively, so that the optical engine shell is guaranteed to move in a lifting mode, and deviation of the optical engine shell is prevented.

Furthermore, two horizontally arranged side guide plates are fixed on two opposite sides of the bottom of the optical engine shell, and two guide rods which respectively penetrate through the corresponding side guide plates are vertically fixed on the inner bottom of the workbench shell. The guide rod limits the side guide plate to move in a lifting mode only in the vertical direction, so that the optical engine shell can be limited and guided, and deviation of the optical engine shell is prevented.

3. Advantageous effects

(1) The DLP optical engine assembly is arranged in an optical engine shell, the middle part above the optical engine shell is connected with an imaging adjusting screw rod which is vertically arranged and penetrates through a workbench shell through a first bearing, and a first threaded hole which is used for the imaging adjusting screw rod to penetrate through and is in threaded fit with the imaging adjusting screw rod is formed in the upper end surface of the workbench shell; when the optical engine shell moves downwards, the illumination projection range of the DLP optical engine assembly is enlarged, so that the resin curing range in the material groove can be enlarged, and products with larger specifications can be printed. For products with different specifications but the same structure, the products with different specifications can be produced only by adjusting the height position of the optical engine shell without changing the control method of the DLP optical engine assembly. The support structure of the DLP optical engine, which is a component of the 3D printer of the present invention, has a function of adjusting the specification of the 3D printed product.

(2) Because the assembly DLP optical engine moves downwards along with the optical engine shell, the illumination intensity irradiated into the material groove and contacted with the resin is weakened, the resin curing speed is reduced, and the printing efficiency is further influenced; when the optical engine shell moves downwards, the first sliding block is driven to move downwards through the connecting plate, so that the resistance of the first sliding rheostat is reduced, the current passing through the LED light source is increased, the illumination intensity of the DLP optical engine on the resin can be enhanced, and the resin curing efficiency is guaranteed.

(3) According to the invention, the supporting air bag is arranged at the bottom of the optical engine shell, the pneumatic cylinder communicated with the supporting air bag is arranged above the optical engine shell, the piston rod of the pneumatic cylinder is fixedly connected with the optical engine shell, and when the optical engine shell moves downwards, the piston rod moves downwards along with the air bag, so that the pneumatic cylinder sucks gas in the supporting air bag through the vent pipe, the volume of the supporting air bag is reduced, the situation that the optical engine shell is prevented from moving downwards is avoided, and the supporting effect on the optical engine shell can be continuously provided; when the optical engine shell moves upwards, the piston rod is driven to move upwards, so that gas in the pneumatic cylinder is discharged into the supporting air bag through the vent pipe, the size of the supporting air bag is enlarged, the ascending optical engine shell can be supported, and the stability of the optical engine shell in the lifting movement process is good.

(4) According to the invention, the second slide rheostat is connected with the first slide rheostat in parallel, and the light intensity adjusting screw rod for driving the second slide block of the second slide rheostat to move up and down is arranged, when the LED light source is applied, the current of the circuit where the LED light source is located is equal to the sum of the current of the branch where the first slide rheostat is located and the current of the branch where the second slide rheostat is located, the resistance of the second slide rheostat can be adjusted through the light intensity adjusting screw rod, the current of the branch where the second slide rheostat is located can be adjusted, the influence of the first slide rheostat on the current of the circuit where the LED light source is located can be relieved, the current of the circuit where the LED light source is located can be increased when the current of the circuit where the LED light source is located is insufficient, the current of the circuit where the LED light source is located can.

In conclusion, the three-dimensional printing device has the function of adjusting the specification of a 3D printing product, can well regulate and control the illumination intensity, and has good movement stability of a related structure.

Drawings

FIG. 1 is a schematic view of the internal structure of the present invention, in which the thick curved lines represent the electrical connection lines of the slide rheostat;

fig. 2 is a schematic structural view of the present invention taken along a vertical center plane in a transverse direction corresponding to a structure on a side of the optical engine housing 14;

FIG. 3 is a schematic structural diagram of the slide rheostat-side structure of the present invention, wherein the thick curve represents the electrical connection wires of the slide rheostat;

fig. 4 is a circuit diagram of the connection between the slide rheostat and the LED light source 22.

Reference numerals: 1. a light output port; 2. a first stopper; 3. a pneumatic cylinder; 4. an imaging adjusting screw; 5. a second limiting block; 6. a connecting plate; 7. a light intensity adjusting screw; 8. an upper fixing plate; 9. a table housing; 10. a second slide rheostat; 11. a lower fixing plate; 12. a first slide rheostat; 13. a side guide plate; 14. an optical engine housing; 15. a support airbag; 16. an air tap; 17. a guide bar; 18. a breather pipe; 19. a piston rod; 20. a first threaded hole; 21. a first bearing; 22. an LED light source; 23. a limiting strip; 24. a first slider; 25. a second threaded hole; 26. a second bearing; 27. and a second slider.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Example 1

As shown in fig. 1 and fig. 2, the support structure of a component DLP optical engine of a 3D printer includes a workbench housing 9 for accommodating the component DLP optical engine, wherein a light output port 1 is formed on one side of an upper end surface of the workbench housing 9; an optical engine shell 14 used for installing a DLP optical engine is arranged in the workbench shell 9, an opening facing the light output port 1 is formed in one end of the optical engine shell 14, an imaging adjusting screw rod 4 which is vertically arranged and penetrates through the top of the workbench shell 9 is connected to the middle of the upper portion of the optical engine shell 14, a first threaded hole 20 for the imaging adjusting screw rod 4 to penetrate through and to be matched with threads of the first threaded hole is formed in the upper end face of the workbench shell 9, and the lower end of the imaging adjusting screw rod 4 is rotatably connected with the optical engine shell 14 through a first bearing 21;

as shown in fig. 1 and 3, a first slide rheostat 12 electrically connected to an LED light source 22 in a DLP optical engine assembly is disposed inside the workbench housing 9, as shown in fig. 4, the first slide rheostat 12 is connected in series with the LED light source 22, the first slide rheostat 12 is vertically disposed at one side of the optical engine housing 14, an upper fixing plate 8 horizontally connected to the inner side wall of the workbench housing 9 is fixed to the upper end of the first slide rheostat 12, a lower fixing plate 11 horizontally connected to the inner side wall of the workbench housing 9 is fixed to the lower end of the first slide rheostat 12, and a first slider 24 on the first slide rheostat 12 is fixedly connected to the optical engine housing 14 through a connecting plate 6; the first slider 24 moves downward, and the resistance value of the first slide resistor 12 becomes small.

In this embodiment, as shown in fig. 1 and 2, the pneumatic cylinder 3 of vertical setting is fixed at the top in the workstation casing 9, be equipped with the peripheral piston board that is completely attached rather than the inner wall in the pneumatic cylinder 3, and be fixed with vertical decurrent and with optical engine casing 14 fixed connection's piston rod 19 on the lower terminal surface of piston board, the bottom of optical engine casing 14 is connected with the support gasbag 15 of fixing the bottom in the workstation casing 9, one side of supporting gasbag 15 is connected with air cock 16, one side upper end of pneumatic cylinder 3 is connected with the breather pipe 18 that communicates with air cock 16. When the optical engine housing 14 moves upwards, the piston rod 19 can be driven to move upwards, so that the gas in the pneumatic cylinder 3 can be extruded out, and the part of the gas is filled into the supporting air bag 15 through the vent pipe 18, so that the supporting air bag 15 is expanded, so that the ascending optical engine housing 14 can be supported, and the stability of the optical engine housing 14 is enhanced.

In this embodiment, as shown in fig. 1 and fig. 2, two ends of the optical engine housing 14 respectively form a protruding portion, one of the protruding portions is located right below the light output port 1, and two first limiting blocks 2 located at two opposite sides of the light output port 1 and clamped at two sides of the corresponding protruding portion are fixed at the inner top of the workbench housing 9; and an LED light source 22 is arranged in the other protruding part, and two second limiting blocks 5 clamped at two sides of the corresponding protruding part are fixed at the inner top of the workbench shell 9. The first limiting block 2 and the second limiting block 5 can respectively limit the position of the protruding part of the optical engine shell 14, so that the optical engine shell 14 can be ensured to move in a lifting manner, and the deviation of the optical engine shell is prevented.

In this embodiment, as shown in fig. 1 and fig. 2, two horizontally disposed side guide plates 13 are fixed to two opposite sides of the bottom of the optical engine housing 14, and two guide rods 17 respectively penetrating through the corresponding side guide plates 13 are vertically fixed to the inner bottom of the table housing 9. The guide rod 17 limits the side guide plate 13 to move in a lifting manner only in the vertical direction, so that the optical engine shell 14 can be limited and guided to prevent deviation.

Example 2

The present embodiment is different from embodiment 1 in that:

in this embodiment, as shown in fig. 1 and 3, a second slide rheostat 10 is vertically disposed on one side of the first slide rheostat 12, the upper and lower ends of the second slide rheostat 10 are respectively and fixedly connected to an upper fixing plate 8 and a lower fixing plate 11, the second slide rheostat 10 is electrically connected to the first slide rheostat 12 in parallel, a second slider 27 of the second slide rheostat 10 is connected to a light intensity adjusting screw 7 extending vertically upward and penetrating through the top of a workbench housing 9, a second threaded hole 25 for the light intensity adjusting screw 7 to pass through and to be in threaded fit with is formed on the upper end surface of the workbench housing 9, a through hole for the light intensity adjusting screw 7 to pass through is formed on the upper fixing plate 8, the lower end of the light intensity adjusting screw 7 is rotatably connected to the second slider 27 through a second bearing 26, and the second slider 27 moves downward, the resistance value of the second slide varistor 10 becomes small. The light intensity adjusting screw 7 can move in a lifting manner by rotating the light intensity adjusting screw 7 and matching with the action of the second threaded hole 25, and due to the arrangement of the second bearing 26, the second sliding block 27 can not rotate along with the light intensity adjusting screw 7 but can move in a lifting manner along with the light intensity adjusting screw 7, so that the up-and-down movement adjustment of the second sliding block 27 can be realized; the second sliding rheostat 10 is connected in parallel with the first sliding rheostat 12 and then connected in series on the energizing line of the LED light source 22, so that the current to the LED light source 22 can be controlled respectively through the two sliding rheostats, and the second sliding rheostat 10 can adjust the current on the corresponding branch circuit through manual control under the condition of not influencing the height position of the optical engine shell 14, so as to assist in adjusting the light intensity of the LED light source 22.

In this embodiment, as shown in fig. 1 and 3, a limiting bar 23 for limiting the position of the first slider 24 or the second slider 27 is disposed on one side of the lower portions of the first slide varistor 12 and the second slide varistor 10. The stop bar 23 defines the lowest point of downward movement of the corresponding slider, thereby preventing the resistance value of the slide rheostat from being too small, i.e., preventing the current passing through the LED light source 22 from being too large.

Otherwise, the same procedure as in example 1 was repeated.

The specific action principle of the support structure of the DLP optical engine of the assembly of the 3D printer is as follows:

the height position of the optical engine shell 14 is adjusted according to the specification size of a product to be printed, if the specification of the product is larger, the imaging adjusting screw rod 4 is controlled to rotate in the forward direction (the imaging adjusting screw rod 4 can be driven by a micro motor to rotate), and the imaging adjusting screw rod 4 drives the optical engine shell 14 to move downwards in cooperation with the first threaded hole 20, so that the illumination projection range of the DLP optical engine is expanded, namely the resin curing range in the material tank can be expanded, and the specification of the printed product can be expanded; as the assembly DLP optical engine moves downward with the optical engine housing 14, the intensity of the illumination directed into the chute in contact with the resin is reduced, which can result in a reduction in the rate of resin curing, which in turn affects printing efficiency. Therefore, the first slide rheostat 12 is arranged, so that the optical engine shell 14 moves downwards, and meanwhile, the first sliding block 24 is driven to move downwards through the connecting plate 6, the resistance of the first slide rheostat 12 is reduced, the current passing through the LED light source 22 is increased, the illumination intensity of the DLP optical engine assembly on resin can be enhanced, and the resin curing efficiency is guaranteed;

if the specification of the product is smaller, controlling the imaging adjusting screw rod 4 to rotate reversely (the imaging adjusting screw rod 4 can be driven by the micro motor to rotate), and matching with the first threaded hole 20, enabling the imaging adjusting screw rod 4 to drive the optical engine shell 14 to move upwards, so that the illumination projection range of the DLP optical engine assembly is reduced, namely the resin curing range in the material tank can be reduced, and the specification of the printed product can be reduced; while the optical engine housing 14 moves upwards, the connecting plate 6 drives the first slide block 24 to move upwards, so that the resistance of the first slide rheostat 12 is increased, the current passing through the LED light source 22 is reduced, and the illumination intensity of the assembly DLP optical engine on the resin is weakened, but as the assembly DLP optical engine moves upwards along with the optical engine housing 14, the illumination intensity on the material tank and in contact with the resin is increased, so that the problem of reduced resin curing speed can be solved, and by controlling the forward rotation of the light intensity adjusting screw 7 (the light intensity adjusting screw 7 can be driven by a micro motor to rotate), the light intensity adjusting screw 7 drives the second slide block 27 to move downwards in cooperation with the second threaded hole 25, so that the resistance of the second slide rheostat 10 is reduced, as analyzed in cooperation with FIG. 4, R1 represents the first slide rheostat 12, R2 represents the second slide rheostat 10, l represents the LED light source 22, E represents the power supply, because R1 is connected with R2 in parallel, the current of the circuit of the LED light source 22 is equal to the sum of the current of the branch of the first slide rheostat 12 and the current of the branch of the second slide rheostat 10, when the resistance of the second slide rheostat 10 is reduced, the current of the branch of the second slide rheostat 10 is increased, the current of the circuit of the LED light source 22 can be increased, the illumination intensity of the LED light source 22 can be enhanced, and the problem that the vertical curing efficiency is reduced due to insufficient illumination intensity can be avoided.

When the optical engine housing 14 moves downwards, the piston rod 19 is driven to move downwards, so that the piston plate in the pneumatic cylinder 3 is driven to move downwards, the pneumatic cylinder 3 sucks the gas in the supporting airbag 15 through the vent pipe 18, the volume of the supporting airbag 15 is reduced, the optical engine housing 14 can be prevented from being blocked from moving downwards, and the supporting effect on the optical engine housing 14 can be continuously provided; when the optical engine housing 14 moves upward, the piston rod 19 is driven to move upward, so as to drive the piston plate in the pneumatic cylinder 3 to move upward, so that the gas in the pneumatic cylinder 3 is discharged into the supporting airbag 15 through the vent pipe 18, the volume of the supporting airbag 15 is enlarged, the raised optical engine housing 14 can be supported, and the stability of the optical engine housing 14 in the lifting movement process is better.

According to the invention, the three-dimensional printing machine has the function of adjusting the specification of a 3D printing product, can well regulate and control the illumination intensity, and has good movement stability of a related structure.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.