A photocuring device for printing high-viscosity multi-material structures

Abstract

The present invention discloses a photocuring molding device that can be used for printing high-viscosity multi-material structures, including: a box, an integrated printing platform, a DLP projection optical machine, a printing platform lifting module, a reflector, a cleaning device, a material storage tank, a microfluidic device and a scraper. The material storage tank includes a turbine agitator and a feed pipe to improve the efficiency of uniform mixing of multiple materials. The scraper includes a scraper with a chamfered blade for scraping materials, a cleaning scraper for removing residual materials in the integrated printing platform, a scraper bracket and a worm device. The scraper is arranged on the side of the integrated printing platform to achieve the leveling and removal of materials. The cleaning device includes an ultrasonic cleaning tank and a drying device to achieve the cleaning and drying of the scraper. The present invention adopts an integrated assembly, which is small in size. The components are compact in structure and used in coordination with each other. The gradient properties can be accurately controlled, and a bracket with continuous or discrete gradient characteristics can be printed.

Description

Technical Field

[0001] The present invention relates to a photocuring molding device, and in particular to a photocuring molding device that can be used for printing high-viscosity multi-material structures. Background Art

[0002] Gradient structures are widely present in biological tissues and play an important role in the growth and development of organisms. For example, bone tissue has very significant mechanical gradient properties, among which the long bone structure is the most typical, with cancellous bone at both ends and compact bone in the middle. The outside is tough and the inside is loose and porous, making the bone both strong and tough.

[0003] At present, the bioceramic scaffolds commonly used in bone repair have a uniformly distributed dispersed phase in the composite material, and the overall material performance is the same, so it does not have gradient characteristics. However, constructing a scaffold with mechanical gradient, mechanical gradient and porosity gradient characteristics can not only bear the corresponding environmental load, but also have good mechanical properties and mechanical properties, which is of great significance for simulating natural bone tissue.

[0004] At present, there are two main methods for high-viscosity multi-material printing: one is based on the principle of multi-tank material replacement, and the other is based on the principle of multi-nozzle material replacement. Both devices occupy a large volume and have poor ability to achieve continuous gradients. The existing microfluidic device technology combined with the light-curing printing system makes it possible to print high-viscosity multi-material scaffolds with continuous gradient characteristics. Summary of the invention

[0005] The purpose of the present invention is to provide a photocuring device that can be used to print high-viscosity multi-material structures, so as to effectively solve the shortcomings of the prior art.

[0006] The device is based on the DLP projection principle of bottom-up exposure. It uses microfluidic equipment technology to accurately control the material feeding at the feed port, and can achieve rapid and high-precision printing of a variety of high-viscosity materials in an integrated printing platform.

[0007] The technical solution adopted by the present invention is:

[0008] The invention comprises a box body, an integrated printing platform, a DLP projection optical machine, a printing platform lifting module, a reflecting mirror, a cleaning device, a material storage tank, a microfluidic device and a scraper.

[0009] The integrated printing platform is connected and fixed to the box body through mechanical parts, and has a material trough for installing special glass at the bottom. The special glass has a transmittance of more than 90% for biological light waves with a specific wavelength of 405nm, and a release film is attached to the glass surface.

[0010] The DLP projector is arranged below the integrated printing platform and fixed to the bottom of the box by mechanical components. The light beam emitted by the DLP projector is reflected by a reflector to the integrated printing platform.

[0011] The printing platform lifting module is arranged on the side of the integrated printing platform, and includes a Z-axis lifting platform and a molding platform.

[0012] The reflector is arranged directly below the special glass in the integrated printing platform, fixed to the bottom surface of the box body, and is formed at a certain angle on the bottom side of the box body to reflect the light beam emitted by the DLP projection light machine.

[0013] The cleaning device is fixed to the integrated printing platform through mechanical components and is arranged on one side of the integrated printing platform.

[0014] The material storage trough is fixed to the integrated printing platform through mechanical components and is arranged on one side of the integrated printing platform and opposite to the cleaning device.

[0015] The microfluidic device is arranged outside the box and connected to the material storage tank. The microfluidic device controls multiple injection pumps through a microfluidic chip to inject multiple materials according to a given ratio, and the multiple materials are transported to the material storage tank through a pipeline.

[0016] The injection pump can be a ready-made instrument, connected to the device of the present invention, or fixedly installed outside the box of the device of the present invention. When in use, it is only necessary to inject slurry into the injection pump, and there is no need to purchase a separate injection pump.

[0017] The scraper is arranged on one side of the integrated printing platform and is controlled to rotate and translate by a motor.

[0018] The cleaning device includes an ultrasonic cleaning tank and a drying device. The drying device includes a shell, a ventilation duct, a small fan and a thermoelectric wire; turn on the power switch to heat the thermoelectric wire, turn on the fan at the same time, and 14 small drying nozzles start to work simultaneously to dry the scraper in all directions; the drying device is arranged above the ultrasonic cleaning tank. The cleaning device is fixed to the integrated printing platform through mechanical parts, and the bottom is connected to the waste liquid storage area through a pipe through the box; when the ultrasonic cleaning tank needs to work, turn on the cleaning liquid inlet switch to fill water; after the scraper is cleaned, turn on the cleaning liquid outlet switch to discharge the waste water in the ultrasonic cleaning tank to the waste liquid storage area.

[0019] The scraper includes a scraper with a chamfered blade for scraping materials, a cleaning scraper for removing residual materials in the integrated printing platform, a worm device and a scraper bracket. The scraper is arranged on the side of the integrated printing platform; the blade of the cleaning scraper is preferably an industrial scouring pad or other cleaning tool; the scraper and the cleaning scraper are fixed on the scraper bracket at a position of 180° relative to each other through mechanical parts, and are controlled by a rotating motor on the scraper bracket to change their use; the rotating motor controls the rotation of the worm device to drive the scraper to translate, and the cylindrical bracket on the worm device plays a positioning role; the motor controls the lifting and lowering of the entire scraper, so that it moves to the cleaning device for cleaning and drying.

[0020] The material storage tank includes a material storage cavity, a large turbine agitator, three small turbine agitators and a feed pipe. The large turbine agitator is fixed to the inner bottom of the material storage tank; the three small turbine agitators are arranged in a spiral ascending shape on the inner side of the material storage tank. The large turbine agitator and the three small turbine agitators rotate in opposite directions. When used together, the materials can be fully mixed and stirred; the feed pipe is used to connect the material storage cavity and the feed inlet of the integrated printing platform. The feed pipe has 12 spiral rib walls inside, which can further mix the materials evenly during transportation. The use of the feed pipe and the turbine agitator together improves the efficiency of mixing the materials evenly. The microfluidic device controls multiple injection pumps to inject multiple materials according to a given ratio through a microfluidic chip. Multiple materials enter the feed inlet of the material storage tank through a pipeline. The material storage tank is connected to the feed inlet of the integrated printing platform through a feed pipe. After the multiple materials are mixed and stirred evenly through the material storage tank and the feed pipe, they enter the printing platform through the feed inlet of the integrated printing platform.

[0021] The working process of the present invention is as follows: the microfluidic device controls multiple injection pumps through a microfluidic chip to inject multiple materials in a given proportion; the multiple materials enter the feed port of the storage tank through a pipeline; at the same time, the large turbine agitator and the small turbine agitator in the storage tank move to stir the materials; the storage tank is connected to the feed port of the integrated printing platform through a feed pipe, and after the materials are evenly mixed by the turbine agitator and the feed pipe, they enter the special glass material tank on the integrated printing platform through the feed port of the integrated printing platform; the scraper in the scraper used to make the material evenly coated begins to coat the material evenly; the computer software is started to slice the model, and the light beam emitted by the DLP projection light machine is reflected by the reflector to the material tank of the special glass; the molding platform in the printing table lifting module starts to move, and the material starts Solidification is achieved on the forming platform; after printing is completed, the forming platform moves to a high place, and the motor controls the scraper to switch to a cleaning scraper to remove residual materials on the printing platform, and then the motor controls it to move to the cleaning device; the cleaning liquid inlet switch at the bottom of the ultrasonic cleaning tank is turned on to start water injection; after the water injection is completed, the ultrasonic cleaning tank switch is turned on, and the ultrasonic cleaning tank starts to work to clean the scraper; after cleaning, the cleaning liquid outlet switch is turned on to discharge the waste water in the ultrasonic cleaning tank into the waste liquid storage area; the scraper moves to the position of the drying device, the power of the drying device is turned on, the thermoelectric wire is heated, and the fan is turned on at the same time, and 14 small drying nozzles start to dry the scraper in all directions. To prevent cross-contamination of materials, the scraper can be cleared and cleaned for multiple times.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. The light-curing molding device of the present invention has a simple and stable structure, low manufacturing cost, and is easy to operate. The high-precision projection of the light machine solidifies the material layer by layer, and can be used to print extremely complex shapes, suitable for various bone repair situations.

[0024] 2. The present invention is an integrated assembly with a small size. It uses microfluidic technology to achieve accurate material replacement and accurately control gradient properties. It can print stents with continuous or discrete gradient properties, and the printed stents have precise structures and good mechanical properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a structural model diagram of an embodiment of the present invention;

[0026] Figure 2 is a schematic diagram of an integrated printing platform in an embodiment of the present invention;

[0027] Figure 3 yes Figure 2 Schematic diagram of radial cross section of part I of the middle pipeline;

[0028] Figure 4A schematic diagram of the structure of a scraper in an embodiment of the present invention;

[0029] Figure 5 is a flow chart of an embodiment of the present invention;

[0030] Figure 6 yes Figure 1 Stereoscopic image of

[0031] In the figure: 1 is a box, 2 is an integrated printing platform, 3 is a material storage tank, 4 is a microfluidic device, 5 is a feed pipe, 6 is a material inlet, 7 is a DLP projection optical machine, 8 is a printing table lifting module, 9 is a scraper, 10 is a reflector, 11 is a cleaning device, 12 is a cleaning liquid outlet, 13 is a drying device, 14 is an ultrasonic cleaning tank, 15 is a cleaning liquid inlet, 16 is a small turbine agitator, 17 is a large turbine agitator, 18 is a cleaning scraper, 19 is a scraper, 20 is a worm device, and 21 is a scraper bracket. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with specific embodiments and accompanying drawings:

[0033] like Figure 1 and Figure 6 As shown, a photocuring molding device that can be used to print high-viscosity multi-material structures includes: a box 1, an integrated printing platform 2, a DLP projection optical machine 7, a printing platform lifting module 8, a reflector 10, a cleaning device 11, a material storage tank 3, a microfluidic device 4 and a scraper 9.

[0034] The integrated printing platform 2 is connected and fixed to the box 1 through mechanical parts, and has a material trough for installing special glass at the bottom. The special glass has a transmittance of more than 90% for biological light waves with a specific wavelength of 405nm, and a release film is attached to the glass surface.

[0035] The DLP projector 7 is arranged below the integrated printing platform 2 and fixed to the bottom of the housing 1 through mechanical components. The light beam emitted by the DLP projector 7 is reflected by the reflector 10 to the integrated printing platform 2 .

[0036] The printing platform lifting module 8 is arranged on the side of the integrated printing platform 2, and includes a Z-axis lifting platform and a molding platform.

[0037] The reflector 10 is arranged directly below the special glass in the integrated printing platform 2 , fixed to the inner bottom surface of the box 1 , and is formed at a certain angle on the bottom side of the box 1 for reflecting the light beam emitted by the DLP projector 7 .

[0038] The cleaning device 11 is fixed to the integrated printing platform 2 via mechanical components and is arranged on one side of the integrated printing platform 2 .

[0039] The material storage tank 3 is fixed to the integrated printing platform 2 through mechanical components and is arranged on one side of the integrated printing platform 2 and opposite to the cleaning device 11 .

[0040] The microfluidic device 4 is arranged outside the box 1 and connected to the material storage tank 3. The microfluidic device 4 controls multiple injection pumps through a microfluidic chip to inject multiple materials according to a given ratio, and the multiple materials are transported to the material storage tank 3 through a pipeline.

[0041] The scraper 9 is arranged on one side of the integrated printing platform 2, and its rotation and translation are controlled by a motor.

[0042] The cleaning device 11 includes an ultrasonic cleaning tank 14 and a drying device 13. The drying device 13 includes a shell, a ventilation duct, a small fan and a thermoelectric wire; turn on the power switch to heat the thermoelectric wire, turn on the fan at the same time, and 14 small drying nozzles start to work simultaneously to dry the scraper 9 in all directions; the drying device 13 is arranged above the ultrasonic cleaning tank 14. The cleaning device 11 is fixed to the integrated printing platform 2 through mechanical parts, and the bottom is connected to the waste liquid storage area through a pipe through the box 1; when the ultrasonic cleaning tank 14 needs to work, the cleaning liquid inlet 15 switch is turned on for water injection; after the scraper 9 is cleaned, the cleaning liquid outlet 12 switch is turned on to discharge the waste water in the ultrasonic cleaning tank 14 to the waste liquid storage area.

[0043] like Figure 2 As shown, the material storage tank 3 includes a material storage cavity, a large turbine agitator 17, three small turbine agitators 16 and a material delivery pipe 5. The large turbine agitator 17 is fixed to the inner bottom of the material storage tank 3; the three small turbine agitators 16 are arranged in a spiral ascending shape inside the material storage tank 3, and the large turbine agitator 17 and the three small turbine agitators 16 rotate in opposite directions. When used together, the materials can be mixed and stirred sufficiently; the material delivery pipe 5 is used to connect the material storage cavity and the feed inlet 6 of the integrated printing platform 2, and the inside of the material delivery pipe 5 has 12 spiral rib walls (such as Figure 3 As shown in the figure, the materials can be further mixed evenly during transportation. The use of the feed pipe 5 and the turbine agitator together improves the efficiency of mixing the materials evenly. The microfluidic device 4 controls multiple injection pumps through the microfluidic chip to inject multiple materials in a given proportion. The multiple materials enter the feed port of the storage tank 3 through the pipeline. The storage tank 3 is connected to the feed port 6 of the integrated printing platform 2 through the feed pipe 5. After the multiple materials are mixed and stirred evenly through the storage tank 3 and the feed pipe 5, they enter the printing platform through the feed port 6 of the integrated printing platform 2.

[0044] like Figure 4As shown, the scraper 9 includes a scraper 19 for scraping materials and having a chamfered blade, a cleaning scraper 18 for cleaning residual materials in the integrated printing platform, a worm device 20 and a scraper bracket 21. The scraper 9 is arranged on the side of the integrated printing platform 2; the blade of the cleaning scraper 18 is preferably a cleaning tool such as an industrial scouring pad; the scraper 19 and the cleaning scraper 18 are fixed on the scraper bracket 21 at a position of 180° relative to each other through mechanical parts, and are controlled to be used differently by a rotating motor on the scraper bracket 21; the rotating motor controls the rotation of the worm device 20 to drive the scraper 9 to translate, and the cylindrical bracket on the worm device 20 plays a positioning and supporting role; the motor controls the lifting and lowering of the scraper 9 as a whole, so that it moves to the cleaning device 11 for cleaning and drying.

[0045] like Figure 5 As shown, the microfluidic device 4 controls multiple injection pumps through a microfluidic chip to inject multiple materials in a given proportion; multiple materials enter the feed port of the storage tank 3 through a pipeline; at the same time, the large turbine agitator 17 and the small turbine agitator 16 in the storage tank 3 move to stir the materials; the storage tank 3 is connected to the feed port 6 of the integrated printing platform 2 through the feed pipe 5, and after the materials are evenly mixed by the turbine agitator and the feed pipe 5, they enter the special glass material tank on the integrated printing platform 2 through the feed port 6 of the integrated printing platform 2; the scraper 19 in the scraper 9 for evenly coating the materials begins to evenly coat the materials; the computer software is started to slice the model, and the DLP projection light machine 7 emits a light beam that is reflected by the reflector 10 into the material tank of the special glass; the molding platform in the printing table lifting module 8 starts to move, and the material begins to be formed on the molding platform The scraper 9 is solidified on the platform; after printing is completed, the molding platform moves to a high place, and the motor controls the scraper 9 to switch to the cleaning scraper 18 to clean the residual material in the printing platform, and then the motor controls it to move to the cleaning device 11; the cleaning liquid inlet 15 at the bottom of the ultrasonic cleaning tank 14 is switched on to start water injection; after the water injection is completed, the ultrasonic cleaning tank 14 is switched on, and the ultrasonic cleaning tank 14 starts to work to clean the scraper 9; after cleaning, the cleaning liquid outlet 12 is switched on to discharge the waste water in the ultrasonic cleaning tank 14 into the waste liquid storage area; the scraper 9 moves to the position of the drying device 13, the drying device power is turned on, the thermoelectric wire is heated, and the fan is turned on at the same time, and 14 small drying nozzles start to dry the scraper 9 in all directions. To prevent cross-contamination of materials, the scraper 9 can be cleaned and cleaned for multiple times.

[0046] Example 1

[0047] Taking the mixed printing of hydroxyapatite (HA) and polycaprolactone (PCL) materials to form a stent with continuous gradient properties as an example, the working process of the device of the present invention is described:

[0048] The microfluidic device controls the microfluidic chip to output hydroxyapatite solution, polycaprolactone solution and photosensitive resin in a certain mass ratio of 1:1:2 through different injection pumps in proportion; various materials are transported to the input port of the storage tank through a pipeline, and the large turbine agitator and three small turbine agitators in the storage tank are stirred for 5 minutes, and then the materials are continuously input into the storage tank. At the same time, the evenly stirred materials are further mixed through the feed pipe to obtain a uniformly mixed polycaprolactone / nanohydroxyapatite composite material.

[0049] Open the computer software, slice the model and set the printing layer thickness to 20 microns. The exposure time of each layer is 10 seconds. In order to strengthen the bonding and prevent the printed material from falling off, the exposure time of the first layer is 20 seconds. After each layer is printed, the molding platform is lifted 20 mm, and the computer is connected to the light-curing printing equipment.

[0050] The material storage tank is connected to the feed port of the integrated printing platform through a feed pipe. As the material is continuously input, the mixed material enters the special glass material tank on the integrated printing platform; the scraper in the scraper begins to evenly coat the material.

[0051] The light beam emitted by the DLP projector is reflected by the reflector into the material trough of the special glass. The material is solidified on the molding platform in the printing table lifting module. The molding platform is lifted 20mm after each layer of printing is completed.

[0052] The rotating motor drives the scraper to convert the scraper, and the cleaning scraper cleans the residual material; the motor controls the cleaning scraper to move to the cleaning device; at the same time, the cleaning liquid inlet at the bottom of the ultrasonic cleaning tank is opened, and water injection begins; after the water injection is completed, the ultrasonic cleaning tank switch is turned on, and the scraper is cleaned for 60 seconds; after the scraper is cleaned, the cleaning liquid outlet is opened to discharge the waste water into the waste liquid storage area; the scraper moves to the drying device position, the drying device power is turned on, the thermoelectric wire is heated, and the fan is turned on at the same time, and 14 small drying nozzles begin to dry the scraper in all directions for 30 seconds.

[0053] Subsequently, the microfluidic device controls the microfluidic chip to output a certain mass ratio of 1.1:0.9:2 of hydroxyapatite solution, polycaprolactone solution and photosensitive resin through a syringe pump; in order to prevent cross-contamination of materials and ensure that the materials used in the previous layer are cleaned, after 5 minutes of material input, the residual materials in the upper layer of the printing platform are cleaned and washed 2-3 times with a scraper; and printing is carried out.

[0054] Change different mass ratios and repeat the above steps until the model is printed.

[0055] Example 2

[0056] Taking the mixed printing of hydroxyapatite (HA) and polycaprolactone (PCL) materials to form a stent with discrete characteristics as an example, the working process of the device of the present invention is explained:

[0057] The microfluidic device controls the microfluidic chip to output hydroxyapatite solution, polycaprolactone solution and photosensitive resin in a certain mass ratio of 4:3:7 through different injection pumps in proportion; various materials are transported to the input port of the storage tank through a pipeline, and the large turbine agitator and three small turbine agitators in the storage tank are stirred for 5 minutes, and then the materials are continuously input into the storage tank. At the same time, the evenly stirred materials are further mixed through the feed pipe to obtain a uniformly mixed polycaprolactone / nano-hydroxyapatite composite material.

[0058] Open the computer software, slice the model and set the printing layer thickness to 20 microns. The exposure time of each layer is 10 seconds. In order to strengthen the bonding and prevent the printed material from falling off, the exposure time of the first layer is 20 seconds. After each layer is printed, the molding platform is lifted 20 mm, and the computer is connected to the light-curing printing equipment.

[0059] The material storage tank is connected to the feed port of the integrated printing platform through a feed pipe. As the material is continuously input, the mixed material enters the special glass material tank on the integrated printing platform; the scraper in the scraper begins to evenly coat the material.

[0060] The light beam emitted by the DLP projector is reflected by the reflector into the material trough of the special glass. The material is solidified on the molding platform in the printing table lifting module. The molding platform is lifted 20mm after each layer of printing is completed.

[0061] The rotating motor drives the scraper to convert the scraper, and the cleaning scraper cleans the residual material; the motor controls the cleaning scraper to move to the cleaning device; at the same time, the cleaning liquid inlet at the bottom of the ultrasonic cleaning tank is opened, and water injection begins; after the water injection is completed, the ultrasonic cleaning tank switch is turned on, and the scraper is cleaned for 60 seconds; after the scraper is cleaned, the cleaning liquid outlet is opened to discharge the waste water into the waste liquid storage area; the scraper moves to the drying device position, the drying device power is turned on, the thermoelectric wire is heated, and the fan is turned on at the same time, and 14 small drying nozzles begin to dry the scraper in all directions for 30 seconds.

[0062] Subsequently, the microfluidic device controls the microfluidic chip to output a certain mass ratio of 1:1:2 of hydroxyapatite solution, polycaprolactone solution and photosensitive resin through a syringe pump; in order to prevent cross-contamination of materials and ensure that the materials used in the previous layer are cleaned, after 5 minutes of material input, the residual materials in the upper layer of the printing platform are cleaned and washed 2-3 times with a scraper; and printing is carried out.

[0063] Subsequently, the microfluidic device controls the microfluidic chip to output a hydroxyapatite solution, a polycaprolactone solution and a photosensitive resin in a certain mass ratio of 7:3:10 through a syringe pump, and the remaining steps are the same as above.

[0064] Change different mass ratios and repeat the above steps until the model is printed.

Claims

1. A photocuring device for printing high-viscosity multi-material structures, characterized in that The device consists of a box, an integrated printing platform, a DLP projection optical machine, a printing platform lifting module, a reflector, a cleaning device, a material storage tank, a microfluidic device and a scraper; The integrated printing platform is connected and fixed to the box, and has a material trough for installing special glass at its bottom. The special glass has a transmittance of more than 90% for biological light waves with a specific wavelength of 405nm, and a release film is attached to the surface of the glass; The DLP projection optical machine is located below the integrated printing platform and fixed to the bottom of the box; the light beam emitted by the DLP projection optical machine is reflected by the reflector to the integrated printing platform; The printing platform lifting module is located on the side of the integrated printing platform, including a Z-axis lifting platform and a molding platform; The reflector is arranged directly below the special glass in the integrated printing platform, fixed to the bottom surface of the box body, and formed at a certain angle to the bottom side of the box body, and is used to reflect the light beam emitted by the DLP projection optical machine; The cleaning device is fixed to the integrated printing platform and arranged on one side of the integrated printing platform; The material storage trough is fixed to the integrated printing platform and arranged on one side of the integrated printing platform; The microfluidic device is arranged outside the box and connected to the material storage tank; The scraper is arranged on one side of the integrated printing platform; The material storage tank comprises a material storage cavity, a large turbine agitator, three small turbine agitators and a material delivery pipe; the large turbine agitator is fixed to the bottom of the material storage tank; the three small turbine agitators are distributed on the inner side of the material storage tank according to a certain pattern; the material delivery pipe is used to connect the material storage cavity with the feed inlet of the integrated printing platform; the microfluidic device controls the output of multiple materials, which are delivered to the feed inlet of the material storage tank through the pipeline, and the material storage tank is connected to the feed inlet of the integrated printing platform through the material delivery pipe; The scraper comprises a scraper with a chamfered blade for scraping materials, a scraper for removing residual materials in the integrated printing platform, a scraper bracket and a worm device; a rotary motor controls the scraper to rotate and change the tool, and the motor controls the worm device to rotate to achieve translation of the scraper, and the motor controls the lifting and lowering of the scraper as a whole; The cleaning device includes an ultrasonic cleaning tank and a drying device; the drying device includes a shell, a ventilation duct, a small fan and a thermoelectric wire; the drying device is arranged above the ultrasonic cleaning tank; the cleaning device is fixed to the integrated printing platform, and the bottom is connected to the waste liquid storage area through a pipe passing through the box for water exchange and drainage.

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