CN118024573B - Ultraviolet light 3D printing device and 3D printing method - Google Patents

Abstract

The present application discloses a UV 3D printing device, which includes a workbench and a transmission mechanism installed on the workbench, an external gear slewing bearing and a driving motor for driving the outer ring of the external gear slewing bearing to rotate are installed on the workbench, four adapters arranged around the central axis of the outer gear ring are installed on the outer ring, and the four adapters are evenly spaced around the central axis of the outer gear ring. The printing platform can be detachably connected to the receiving part of the adapter or the clamping part of the transmission mechanism; four working areas, namely, the printing area, the cleaning area, the post-curing area and the pickup area, are arranged in sequence on the workbench, and the outer ring can drive the printing platform to be located directly above the printing area, the cleaning area, the post-curing area and the pickup area in sequence; the working end is always located directly above the printing area. A 3D printing method for printing 3D products using a UV 3D printing device is also disclosed. The present application uses only one set of transmission mechanisms to achieve continuous operation to reduce failure rate and maintenance costs.

Description

Ultraviolet light 3D printing device and 3D printing method

Technical Field

The invention relates to an ultraviolet 3D printing device and a 3D printing method.

Background technique

With the rapid development of 3D printing technology, its application in manufacturing, medical, construction and other fields is becoming more and more extensive. In particular, UV-curing 3D printing technology has attracted extensive attention in the industry and research fields due to its high precision and rapid prototyping. However, with the continuous increase in application demand, existing UV 3D printing technology and equipment are facing new challenges in terms of efficiency, cost and ease of operation.

In the traditional UV-curing 3D printing process, 3D printed products need to go through multiple post-processing steps, including cleaning, post-curing and peeling from the printing platform. These steps often need to be completed by different equipment, making the entire production process cumbersome and inefficient. At the same time, the transfer of products between various processing equipment increases the complexity of the operation and may also cause damage to the incompletely cured products, thereby affecting the product quality.

In addition, existing continuous 3D printing equipment is usually equipped with multiple transmission mechanisms to achieve the movement of products between different processes. This design not only increases the manufacturing cost of the equipment, but also increases the failure rate due to the complexity of the components, leading to increased maintenance costs. Therefore, a new 3D printing equipment design and printing method is urgently needed to solve the problems of low production efficiency, high cost and high operation complexity.

Summary of the invention

In order to solve the above problems, the present application first proposes a UV 3D printing device, which includes a workbench, on which a transmission mechanism is installed, the transmission mechanism has a ball screw extending in a vertical direction and a connecting arm engaged with the ball screw, the free end of the connecting arm is formed as a working end, a printing platform is detachably installed on the working end, and the connecting arm can drive the printing platform to reciprocate in the vertical direction;

A rotating mechanism is installed on the workbench, and the rotating mechanism includes an external gear slewing bearing and a driving motor. The outer ring of the external gear slewing bearing is an external gear ring, and the inner ring of the external gear slewing bearing is fixed on the workbench. The driving motor is fixed on the workbench. A driving gear is installed on the output shaft of the driving motor. The driving gear is meshed with the external gear ring. Under the drive of the driving motor, the driving gear can drive the external gear ring to rotate; the external gear slewing bearing is sleeved on the ball screw.

Four adapters are fixedly mounted on the outer gear ring. The four adapters are evenly spaced around the central axis of the outer gear ring. Each adapter includes a column and a crossbeam.

The column extends upward in the vertical direction, one end of the crossbeam is fixedly installed on the top of the column, and the other end of the crossbeam extends horizontally toward the direction of the ball screw. One end of each crossbeam facing the ball screw is formed as a receiving end, and a receiving portion is provided on the receiving end; a clamping portion is provided on the working end; the printing platform can be detachably connected to the receiving portion or the clamping portion;

On the workbench, four working areas, namely, a printing area, a cleaning area, a post-curing area and a pickup area, are sequentially arranged around the central axis of the outer gear ring. Driven by a driving motor, the outer gear ring can drive the four adapters to rotate synchronously around the central axis of the outer gear ring, and enable the printing platform carried by each clamping part to be sequentially located directly above the printing area, the cleaning area, the post-curing area and the pickup area; the working end is always located directly above the printing area;

An ultraviolet light system is installed in the workbench. The ultraviolet light system includes a liquid crystal screen arranged in the printing area. The ultraviolet light emitted by the ultraviolet light system can irradiate the liquid crystal screen.

When using this application to print 3D products, first install the printing platform on the working end, then print the product model. After the product model is printed, transfer the printing platform from the working end to the receiving end of the adapter, and separate the printing platform from the working end. Then use the rotating mechanism to drive the adapter to the cleaning area, post-curing area and pickup area in turn and perform the corresponding processes. The product model becomes a 3D product. In the pickup area, remove the 3D product on the printing platform, and return the printing platform to the printing area to continue working, thereby achieving continuous work. For the cleaning, post-curing and removal of the 3D product from the printing platform, existing mature technologies are used.

In the present application, only one set of transmission mechanism is provided to move the printing platform up and down for 3D printing, and the transfer of the printing platform carrying the product model is jointly realized by the rotating mechanism and the adapter, which can eliminate three sets of transmission mechanisms, wherein the transmission mechanism directly adopts the existing mature technology, thereby reducing the manufacturing cost of the 3D printing device. Since only one set of transmission mechanism is adopted, its failure rate is also reduced accordingly, thereby reducing the corresponding maintenance cost. Although one set of rotating mechanism is added, compared with eliminating three sets of transmission mechanisms, and since the precision and manufacturing cost of the transmission mechanism are much greater than that of the rotating mechanism, it can still effectively reduce the manufacturing cost of the 3D printing device, and correspondingly reduce its failure rate and maintenance cost.

Specifically, in order to enable the printing platform to be smoothly connected to the working end or the receiving end and to be stably maintained on the working end or the receiving end, the clamping portion includes a first clamping groove and a first electric cylinder. The first clamping groove is horizontally arranged, and the first clamping groove passes through both sides of the working end in the horizontal direction, and the first clamping groove passes through the end surface of the working end away from the ball screw. The cylinder barrel of the first electric cylinder is fixedly installed on the upper surface of the working end.

Each receiving portion includes a second clamping groove and a second electric cylinder. The second clamping groove is vertically arranged and passes through the upper surface and the lower surface of the receiving end in the vertical direction, and the second clamping groove passes through the end surface of the receiving end facing the ball screw. The cylinder barrel of the second electric cylinder is fixedly installed on the side surface of the receiving end.

The upper end of the printing platform has a first connecting portion and a second connecting portion;

The first connecting portion can be inserted into or withdrawn from the first clamping groove in a horizontal direction. When the first connecting portion is inserted into the first clamping groove, the piston rod of the first electric cylinder can press against the first connecting portion in a vertical direction to connect the printing platform to the clamping portion.

The second connecting part can be inserted into or withdrawn from the second clamping groove in a horizontal direction. When the second connecting part is inserted into the second clamping groove, the piston rod of the second electric cylinder can press against the second connecting part in a horizontal direction to connect the printing platform to the receiving part.

The first electric cylinder can be used to quickly connect the printing platform to the clamping part of the working end, or release the printing platform from the clamping part, so that the receiving part can carry the printing platform for movement. The second electric cylinder can be used to quickly connect the printing platform to the receiving part of the receiving end, or release the printing platform from the receiving part, so that the clamping part can carry the printing platform for movement.

Furthermore, in order to prevent the printing platform from deviating on the clamping part or the receiving part, a first limiting hole is provided on the upper surface of the first connecting part, into which the piston rod of the first electric cylinder can be inserted; a second limiting hole is provided on the side of the second connecting part, into which the piston rod of the second electric cylinder can be inserted. The first limiting hole and the second limiting hole can be used to conveniently position the printing platform on the clamping part or the receiving part.

In order to ensure that the printing platform is tilted on the clamping part or the receiving part, two first electric cylinders are provided, and corresponding to each receiving part, two second electric cylinders are provided, and the piston rods of the two second electric cylinders are not coaxially arranged.

Furthermore, in order to prevent the power cord of the second electric cylinder from being entangled, an electric slip ring is also included, which includes a stator and a mover. The mover is sleeved on the outer circumferential surface of the stator. The stator is fixedly installed on the outer circumferential surface of the workbench. The mover is fixedly connected to the outer ring of the external gear slewing bearing. The power cord of the second electric cylinder is connected to the power output terminal of the mover.

Furthermore, in order to facilitate the cleaning of the product model, a cleaning hole in the shape of a through hole is opened in the cleaning area, and the cleaning hole extends in the vertical direction. A first lifting device is installed in the inner cavity of the workbench, and a cleaning bucket is installed on the first lifting device. The first lifting device can drive the cleaning bucket to extend upward out of the cleaning hole or retract the cleaning bucket downward into the inner cavity of the workbench. The cleaning bucket is used to clean the product model on the printing platform.

Furthermore, in order to improve the cleaning efficiency, an ultrasonic generator is installed on the lower side of the bottom of the cleaning barrel.

Furthermore, in order to facilitate the drying of the product model, a post-curing hole in the shape of a through hole is opened in the post-curing area, and the post-curing hole extends in the vertical direction. A second lifting device is installed in the inner cavity of the workbench, and a post-curing device is installed on the second lifting device. The post-curing device includes a cylinder fixed on the second lifting device and an LED ultraviolet lamp fixed on the inner side of the cylinder, and the LED ultraviolet lamps are evenly arranged along the inner circumference of the cylinder; the second lifting device can drive the post-curing device to extend upward from the post-curing hole or retract the post-curing device downward into the inner cavity of the workbench, and the post-curing device is used to post-curing the product model on the printing platform.

Secondly, the present application also provides a 3D printing method, which uses any of the above-mentioned ultraviolet 3D printing devices, and the 3D printing method comprises the following steps:

(1) The printing platform is detachably connected to the clamping part, and the printing platform is located directly above the printing area, the transmission mechanism is started, and the printing process is performed to print the product model on the printing platform. When the first set time is reached, the printing of the product model is completed and the transmission mechanism is paused;

(2) The printing platform is detachably connected to the receiving end, and the printing platform is separated from the clamping part, and the driving motor is started, so that the adapter part carries the printing platform to the top of the cleaning area, and the rotation of the driving motor is stopped to perform the cleaning process to clean the product model on the printing platform;

(3) When the second set time is reached, the drive motor is started again, so that the adapter carries the printing platform to the top of the post-curing area, the rotation of the drive motor is stopped, and the post-curing process is performed to post-curing the product model on the printing platform, and the product model becomes a 3D product;

(4) When the third set time is reached, the drive motor is started again, so that the adapter carries the printing platform to the top of the pickup area, the rotation of the drive motor is paused, and the pickup process is performed to remove the 3D product on the printing platform;

(5) When the fourth set time is reached, the drive motor is started again, so that the adapter carries the printing platform for removing the 3D product to the top of the printing area; the printing platform is detachably connected to the clamping part, and the printing platform is separated from the receiving end, and the transmission mechanism is started again to perform the printing process, and the product model is printed on the printing platform. When the first set time is reached, the printing of the product model is completed;

(6) Repeat steps (2) to (5) to continue producing 3D products.

By adopting the above 3D printing method, a single 3D product can be processed continuously, and 3D products can be produced continuously, so as to realize the assembly line production of 3D products and improve production efficiency.

Specifically, in order to carry out continuous production smoothly, the first set time, the second set time, the third set time and the fourth set time are all the same, which is the fifth set time. The fifth set time is the longest duration among the printing process time, the cleaning process time, the post-curing process time and the pickup process time. The printing process time is the time the printing process lasts, the cleaning process time is the time the cleaning process lasts, the post-curing process time is the time the post-curing process lasts, and the pickup process time is the time the pickup process lasts.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the structure of the ultraviolet 3D printing device in the present application.

FIG. 2 is a top view of FIG. 1 .

Figure 3 is a diagram of the equipment layout on the workbench.

FIG. 4 is an enlarged view of portion A in FIG. 1 .

FIG. 5 is an enlarged view of portion B in FIG. 1 .

FIG. 6 is an enlarged view of portion C in FIG. 1 .

FIG. 7 is an enlarged view of portion D in FIG. 2 .

FIG. 8 is a schematic diagram of the structure of a printing platform.

Detailed ways

Referring to FIG. 1 to FIG. 8 , in the drawings, the extension direction of the first axis X represents the first axis direction, and the extension direction of the second axis Y represents the second axis direction. The first axis X and the second axis Y both extend in the horizontal direction and are perpendicular to each other. The specific structure of the ultraviolet 3D printing device is described below. The ultraviolet 3D printing device includes a workbench 10,

The workbench 10 is hollow and includes a vertically extending annular wall 11, a top plate 13 fixed to the top of the wall, and a bottom plate 12 fixed to the bottom of the wall. The space enclosed by the wall, the top plate and the bottom plate forms an inner cavity of the workbench.

A transmission mechanism 60 is installed on the workbench 10. The transmission mechanism 69 adopts the existing mature technology. The transmission mechanism 60 includes a vertical rod 61 fixed to the central part of the bottom plate, and a ball screw 62 extending in the vertical direction is rotatably installed on one side of the vertical rod 61. One end of the connecting arm 63 is engaged with the ball screw through a screw hole. The connecting arm 63 extends along the first axis direction, and the other end of the connecting arm is a free end, which is formed as a working end 631, and the printing platform 70 is detachably mounted on the working end. A servo motor 66 for driving the ball screw 62 to rotate is fixedly installed on the bottom plate. Driven by the servo motor 66, the connecting arm can reciprocate in the vertical direction along the ball screw 62, and drive the printing platform 70 to reciprocate in the vertical direction. The lower surface of the printing platform is formed as the printing working surface of the product model.

A center hole 131 is provided in the center of the top plate 13 , and the ball screw freely passes through the center hole 131 from bottom to top and then extends out of the top plate.

A rotating mechanism is installed on the workbench, and the rotating mechanism includes an external gear slewing bearing 20 and a driving motor 42. The external gear slewing bearing 20 includes an inner ring 21 and an outer ring 22, and the inner ring and the outer ring are rotatably sleeved together via balls 23, and the outer ring is an external gear ring. The central axis of the external gear slewing bearing 20 extends in the vertical direction.

The inner ring 21 is supported on the top of the vertical wall 11, and the outer edge of the top plate is supported on the upper surface of the inner ring 21. The fastening bolts 24 pass through the top plate and the inner ring from top to bottom and are screwed on the vertical wall, so that the top plate is connected to the vertical wall through the inner ring, so that the external gear slewing bearing sleeve is arranged on the ball screw.

A motor bracket 41 is welded on the outer wall of the vertical wall, and a driving motor 42 is fixedly mounted on the motor bracket. The output shaft of the driving motor extends upward in the vertical direction. A driving gear 43 is mounted on the output shaft of the driving motor. The driving gear 43 is meshed with the outer gear ring. Driven by the driving motor, the driving gear can drive the outer gear ring to rotate.

Four adapters 50 are fixedly mounted on the outer gear ring. The four adapters 50 are evenly spaced around the central axis of the outer gear ring. Each adapter includes a column 51 and a crossbeam 53. The column is fixedly mounted on the upper end surface of the outer ring of the external gear slewing bearing 20 via connecting bolts 26.

The column extends upward in the vertical direction, one end of the beam is fixedly installed on the top of the column, and the other end of the beam extends horizontally toward the direction of the ball screw. One end of each beam facing the ball screw is formed as a receiving end 531, and a receiving portion is provided on each receiving end, and a clamping portion is provided on the working end.

In this embodiment, the receiving portion includes a second clamping groove 54 and two second electric cylinders 81. The second clamping groove 54 is arranged in the vertical direction. The second clamping groove passes through the upper surface and the lower surface of the receiving end in the vertical direction, and the second clamping groove passes through the end surface of the receiving end facing the ball screw. The second clamping groove 54 divides the receiving end into a first side plate 541 and a second side plate 542. The first side plate and the second side plate are arranged at intervals relative to the second clamping groove in the horizontal direction. The cylinder barrels of the two second electric cylinders 81 are fixedly mounted on the side of the first side plate away from the second side plate. Corresponding to each second electric cylinder, a second piston hole 543 is opened on the first side plate, and the piston rod of each second electric cylinder can freely extend into the second clamping groove through the corresponding second piston hole. Since the two second electric cylinders are arranged on the same side of the first side plate, the piston rods of the two second electric cylinders are arranged non-coaxially.

In this embodiment, the clamping portion includes a first clamping groove 64 and two first electric cylinders 86. The first clamping groove 64 is horizontally arranged, and the first clamping groove passes through both sides of the working end in the horizontal direction, and the first clamping groove passes through the end surface of the working end away from the ball screw. The first clamping groove 64 divides the working end into an upper side plate 641 and a lower side plate 642 in the up and down direction, and the upper side plate 641 and the lower side plate 642 are spaced relative to the first clamping groove in the vertical direction. The cylinder barrels of the two first electric cylinders 86 are fixedly mounted on the upper surface of the upper side plate, and a first piston hole 643 is opened on the upper side plate corresponding to each first electric cylinder, and the piston rod of each first electric cylinder can freely extend into the first clamping groove through the corresponding first piston hole.

The printing platform 70 includes a platform body 71 and a transition block 72 fixed above the platform body. A connecting beam 75 extending in the horizontal direction is arranged on the upper side of the transition block. The opposite ends of the connecting beam are respectively formed into a first connecting portion 73 and a second connecting portion 74. The lower surface of the platform body 71 is formed as a printing work surface.

The first connection part can be inserted into or withdrawn from the first clamping groove in the horizontal direction. When the first connection part is inserted into the first clamping groove, the piston rod of the first electric cylinder can press against the first connection part in the vertical direction to connect the printing platform to the clamping part. The second connection part can be inserted into or withdrawn from the second clamping groove in the horizontal direction. When the second connection part is inserted into the second clamping groove, the piston rod of the second electric cylinder can press against the second connection part in the horizontal direction to connect the printing platform to the receiving part. When the printing platform 70 is connected to the working end, the connecting beam 75 extends along the first axis direction.

In order to keep the printing platform stably on the clamping part or the receiving part, in the present embodiment, a first limiting hole 731 is provided on the upper surface of the first connecting part corresponding to each first electric cylinder, and the piston rod of the first electric cylinder can be inserted into the corresponding first limiting hole 731 to keep the printing platform stably on the clamping part.

Corresponding to each second electric cylinder, a second limiting hole 741 is provided on the side of the second connecting portion facing the first side plate 541, and the piston rod of the second electric cylinder can be inserted into the second limiting hole to stably hold the printing platform on the receiving portion.

On the top plate 13, four working areas, namely, a printing area 101, a cleaning area 102, a post-curing area 103 and a pickup area 104, are arranged in sequence around the central axis of the outer gear ring. In the attached figure, the four working areas are indicated by dotted lines. Driven by the drive motor, the outer gear ring can drive the four adapters to rotate synchronously around the central axis of the outer gear ring, and enable the printing platform carried by each receiving part to be located directly above the printing area, the cleaning area, the post-curing area and the pickup area in sequence; the working end is always located directly above the printing area. Based on the central axis of the outer gear ring, the angle between two adjacent working areas is 90°, that is, every time the outer gear ring rotates 90°, the printing platform can be transferred from directly above one working area to directly above the adjacent working area.

When the printing platform is located directly above the printing area and the post-curing area, the connecting beams 75 extend along the first axis direction. When the printing platform is located directly above the cleaning area and the pickup area, the connecting beams 75 extend along the second axis direction.

An ultraviolet light system is installed in the workbench, and the ultraviolet light system includes an ultraviolet light source 14, a condenser and a liquid crystal screen 15. The ultraviolet light system adopts existing mature technology, wherein the ultraviolet light source 14 is installed on the upper surface of the bottom plate, and the liquid crystal screen 15 is installed on the top plate 13 and is located in the printing area. In the attached figure, the condenser is not shown. The ultraviolet light emitted by the ultraviolet light source 14 can irradiate the liquid crystal screen. A material trough 111 is placed in the printing area. The material trough can be set according to the existing technology and will not be repeated. A carrier plate 114 is movably placed in the pickup area for placing 3D products removed from the printing platform.

In order to avoid the power lines connected to the two electric cylinders from getting tangled, the present embodiment further includes an electric slip ring 30, which includes a stator 31 and a mover 32. The mover is sleeved on the outer circumference of the stator. The stator is fixedly mounted on the outer circumference of the vertical wall 11. The mover is fixedly connected to the outer ring of the external gear slewing bearing via a slip ring bolt 25. The power line of the second electric cylinder is connected to the power output terminal of the mover.

A through-hole-shaped cleaning hole 132 is provided in the cleaning area 102, and the cleaning hole extends in the vertical direction and passes through the top plate. A first lifting device is installed in the inner cavity of the workbench, and a cleaning bucket 112 is installed on the first lifting device. The first lifting device can drive the cleaning bucket to extend upward out of the cleaning hole or retract the cleaning bucket downward into the inner cavity of the workbench. The cleaning bucket is used to clean the product model on the printing platform. To facilitate cleaning and improve cleaning efficiency, an ultrasonic generator is installed on the lower side of the bottom of the cleaning bucket.

A through-hole-shaped post-curing hole 133 is provided in the post-curing area 103, and the post-curing hole extends in the vertical direction and passes through the top plate. A second lifting device 65 is installed in the inner cavity of the workbench, and a post-curing device 113 is installed on the second lifting device. The post-curing device 113 includes a cylinder 1131 fixed on the second lifting device and an LED ultraviolet lamp 1132 fixed on the inner side of the cylinder, and the LED ultraviolet lamps are evenly arranged along the inner circumference of the cylinder; the second lifting device can drive the post-curing device to extend upward out of the post-curing hole or retract the post-curing device downward into the inner cavity of the workbench, and the post-curing device is used to post-cure the product model on the printing platform.

The following is an explanation of the 3D printing method, which is performed using the above-mentioned ultraviolet 3D printing device. The 3D printing method includes the following steps:

(1) Insert the first connecting portion 73 of the printing platform 70 into the first clamping groove, start the first electric cylinder, extend the piston rod of the first electric cylinder into the first clamping groove, and insert it into the first limiting hole 731, and tightly press the first connecting portion against the lower side plate 642, so that the printing platform is detachably connected to the clamping portion, and the printing platform is located directly above the printing area, start the transmission mechanism, perform the printing process, and print the product model on the printing platform. When the first set time is reached, the printing of the product model is completed and the transmission mechanism is paused.

(2) Start the transmission mechanism, adjust the height of the printing platform, insert the second connection part 74 of the printing platform into the first clamping groove, start the second electric cylinder, extend the piston rod of the second electric cylinder into the second clamping groove, and insert it into the second limiting hole 741, and tightly press the second connection part against the second side plate 542, so that the printing platform is detachably connected to the receiving part. Start the first electric cylinder, retract the piston rod of the first electric cylinder, release the first connection part, and make the printing platform detach from the clamping part, start the drive motor, rotate the outer ring of the external gear slewing bearing 20, and make the adapter carry the printing platform to the top of the cleaning area, and stop the rotation of the drive motor. Carry out the cleaning process to clean the product model on the printing platform.

When the printing platform carrying the product model reaches the cleaning area and is located directly above the cleaning hole, the first lifting platform is started to extend upward, the washing bucket is extended upward out of the cleaning hole, and the product model is immersed in the washing bucket, the washing bucket is filled with detergent, the ultrasonic generator is started, and the product model is washed. After washing, the first lifting platform is retracted downward, and the washing bucket is retracted downward into the inner cavity of the workbench. In this embodiment, the detergent is specifically deionized water. In other embodiments, other detergents can be used according to different requirements.

(3) When the second set time is reached, the drive motor is started again, so that the adapter carries the printing platform to the top of the post-curing area, the rotation of the drive motor is paused, and the post-curing process is performed to post-curing the product model on the printing platform, and the product model becomes a 3D product.

When the printing platform carrying the product model reaches the post-curing area and is located directly above the post-curing hole, the second lifting platform is started to extend the second lifting platform upward, the post-curing device is extended upward out of the cleaning hole, and the product model enters the cylinder to post-curing the product model. After the post-curing is completed, the second lifting platform is retracted downward, and the post-curing device is retracted downward into the adjustment chamber.

(4) When the third set time is reached, the drive motor is started again, so that the adapter carries the printing platform to the top of the pickup area, the rotation of the drive motor is paused, and the pickup process is performed to remove the 3D product on the printing platform;

(5) When the fourth set time is reached, start the drive motor again, so that the adapter carries the printing platform for removing the 3D product to the top of the printing area, insert the first connection part 73 of the printing platform 70 into the first clamping groove, start the first electric cylinder, extend the piston rod of the first electric cylinder into the first clamping groove, and insert it into the first limiting hole 731, and press the first connection part tightly against the lower side plate 642, so that the printing platform is detachably connected to the clamping part. Start the second cylinder to retract the piston rod of the second electric cylinder, release the second connection part, and separate the printing platform from the receiving end. Start the transmission mechanism again, carry out the printing process, print the product model on the printing platform, and when the first set time is reached, complete the printing of the product model;

(6) Repeat steps (2) to (5) to continue producing 3D products.

In this embodiment, the first setting time, the second setting time, the third setting time and the fourth setting time are all the same, which are the fifth setting time. The fifth setting time is the longest duration among the printing process time, the cleaning process time, the post-curing process time and the pickup process time. The printing process time is the duration of the printing process, the cleaning process time is the duration of the cleaning process, the post-curing process time is the duration of the post-curing process, and the pickup process time is the duration of the pickup process. Since the printing process time is the longest in this embodiment, the printing process time is used as the fifth setting time.

It can be understood that when the ultraviolet 3D printing device in this embodiment is used for only one printing, the first set time, the second set time, the third set time and the fourth set time can be different, and each set time can be adjusted according to the actual working time of the process.

Before printing, it is necessary to test the actual working time of the four processes, namely the printing process time, the cleaning process time, the post-curing process time and the pickup process time, and select the one with the longest actual working time as the fifth set time.

Claims (10)

1. The ultraviolet 3D printing device is characterized by comprising a workbench, wherein a transmission mechanism is arranged on the workbench, the transmission mechanism is provided with a ball screw extending along the vertical direction and a connecting arm meshed with the ball screw, the free end of the connecting arm is formed into a working end, a printing platform is detachably arranged on the working end, and the connecting arm can drive the printing platform to reciprocate in the vertical direction;

the rotary mechanism comprises an external tooth type slewing bearing and a driving motor, wherein an outer ring of the external tooth type slewing bearing is an external gear ring, an inner ring of the external tooth type slewing bearing is fixed on the workbench, the driving motor is fixed on the workbench, a driving gear is mounted on an output shaft of the driving motor and meshed with the external gear ring, and the driving gear can drive the external gear ring to rotate under the driving of the driving motor; the external tooth type slewing bearing is sleeved on the ball screw;

Four adapter parts are fixedly arranged on the outer gear ring and uniformly arranged at intervals around the central axis of the outer gear ring, and each adapter part comprises an upright post and a cross beam;

The upright column extends upwards along the vertical direction, one end of the cross beam is fixedly arranged at the top of the upright column, the other end of the cross beam extends towards the ball screw along the horizontal direction, one end of each cross beam towards the ball screw is formed into a receiving end, and a receiving part is arranged on the receiving end; a clamping part is arranged on the working end; the printing platform can be detachably connected to the receiving part or the clamping part;

The printing platform is characterized in that a printing area, a cleaning area, a post-curing area and a workpiece taking area are sequentially arranged on the workbench at intervals around the central axis of the outer gear ring, the outer gear ring can drive four transfer parts to synchronously rotate around the central axis of the outer gear ring under the driving of a driving motor, and the printing platform carried by each clamping part can be sequentially positioned right above the printing area, the cleaning area, the post-curing area and the workpiece taking area; the working end is always positioned right above the printing area;

an ultraviolet light system is arranged in the workbench and comprises a liquid crystal screen arranged in a printing area, and ultraviolet light emitted by the ultraviolet light system can irradiate the liquid crystal screen.

2. The ultraviolet 3D printing device according to claim 1, wherein the clamping portion comprises a first clamping groove and a first electric cylinder, the first clamping groove is horizontally arranged, the first clamping groove penetrates through two sides of the working end in the horizontal direction, and the first clamping groove penetrates through the end face of the working end, which is away from the ball screw; the cylinder barrel of the first electric cylinder is fixedly arranged on the upper surface of the working end;

Each receiving part comprises a second clamping groove and a second electric cylinder, wherein the second clamping groove is vertically arranged, penetrates through the upper surface and the lower surface of the receiving end along the vertical direction, and penetrates through the end face of the receiving end towards the ball screw; the cylinder barrel of the second electric cylinder is fixedly arranged on the side surface of the receiving end;

the upper end of the printing platform is provided with a first connecting part and a second connecting part;

the first connecting part can be inserted into or withdrawn from the first clamping groove along the horizontal direction, and when the first connecting part is inserted into the first clamping groove, a piston rod of the first electric cylinder can be propped against the first connecting part along the vertical direction to connect the printing platform on the clamping part;

The second connecting portion can be inserted into or withdrawn from the second clamping groove along the horizontal direction, and when the second connecting portion is inserted into the second clamping groove, a piston rod of the second electric cylinder can be pressed against the second connecting portion along the horizontal direction, and the printing platform is connected to the receiving portion.

3. The ultraviolet 3D printing device according to claim 2, wherein a first limiting hole is formed in the upper surface of the first connecting portion, and a piston rod of the first electric cylinder can be inserted into the first limiting hole; the side of the second connecting part is provided with a second limiting hole, and a piston rod of the second electric cylinder can be inserted into the second limiting hole.

4. Ultraviolet 3D printing device according to claim 2, characterized in that two first electric cylinders are provided, two second electric cylinders are provided for each receiving portion, and the piston rods of the two second electric cylinders are not coaxially arranged.

5. The ultraviolet 3D printing device according to claim 2, further comprising an electrical slip ring, the electrical slip ring comprising a stator and a mover, the mover being sleeved on an outer circumferential surface of the stator, the stator being fixedly mounted on an outer circumferential surface of the table, the mover being fixedly connected to an outer ring of the external-tooth slewing bearing, and a power cord of the second electrical cylinder being connected to a power output end of the mover.

6. The ultraviolet 3D printing device according to claim 1, wherein a cleaning hole in a through hole shape is formed in the cleaning area, the cleaning hole extends along the vertical direction, a first lifting device is installed in the inner cavity of the workbench, a cleaning barrel is installed on the first lifting device, the first lifting device can drive the cleaning barrel to extend upwards out of the cleaning hole or retract the cleaning barrel downwards into the inner cavity of the workbench, and the cleaning barrel is used for cleaning a product model on the printing platform.

7. The ultraviolet 3D printing device according to claim 6, wherein an ultrasonic generator is installed at the lower side of the bottom of the washing tub.

8. The ultraviolet 3D printing device according to claim 1, wherein a post-curing hole in a through hole shape is formed in the post-curing area, the post-curing hole extends in the vertical direction, a second lifting device is arranged in an inner cavity of the workbench, and a post-curing device is arranged on the second lifting device, the post-curing device comprises a cylinder body fixed on the second lifting device and an LED ultraviolet lamp fixed on the inner side of the cylinder body, and the LED ultraviolet lamp is uniformly arranged along the inner peripheral surface of the cylinder body; the second lifting device can drive the post-curing device to extend upwards out of the post-curing hole or retract the post-curing device downwards into the inner cavity of the workbench, and the post-curing device is used for post-curing the product model on the printing platform.

9. A 3D printing method, characterized in that an ultraviolet light 3D printing device according to any one of claims 1-8 is used, the 3D printing method comprising the steps of:

(1) Detachably connecting the printing platform to the clamping part, enabling the printing platform to be positioned right above the printing area, starting the transmission mechanism, performing a printing procedure, printing the product model on the printing platform, and finishing printing of the product model when the first set time is reached, and suspending the transmission mechanism;

(2) The printing platform is detachably connected to the receiving end, the printing platform is separated from the clamping part, the driving motor is started, the transfer part carries the printing platform to reach the position right above the cleaning area, the rotation of the driving motor is suspended, the cleaning process is carried out, and the product model on the printing platform is cleaned;

(3) When the second set time is reached, starting the driving motor again, enabling the transfer part to carry the printing platform to reach the position right above the post-curing area, suspending the rotation of the driving motor, performing a post-curing process, and performing post-curing on the product model on the printing platform, wherein the product model becomes a 3D product;

(4) When the third set time is reached, the driving motor is started again, so that the transfer part carries the printing platform to reach the position right above the picking-up area, the rotation of the driving motor is paused, the picking-up process is carried out, and the 3D product on the printing platform is picked up;

(5) When the fourth set time is reached, the driving motor is started again, so that the printing platform with the 3D product removed by the switching part reaches the position right above the printing area; the printing platform is detachably connected to the clamping part, the printing platform is separated from the receiving end, the transmission mechanism is started again to perform a printing process, the product model is printed on the printing platform, and when the first set time is reached, the printing of the product model is completed;

(6) Repeating the steps (2) - (5), and continuously producing the 3D product.

10. The 3D printing method of claim 9, wherein the first set time, the second set time, the third set time, and the fourth set time are all the same, and are all fifth set times, the fifth set time being a longest one of a printing process time, a cleaning process time, a post-curing process time, and a pick-up process time, the printing process time being a duration of the printing process, the cleaning process time being a duration of the cleaning process, the post-curing process time being a duration of the post-curing process, and the pick-up process time being a duration of the pick-up process.