Desktop-level photocuring printer

Abstract

In order to overcome the defects in the prior art, the desktop-level photocuring printer comprises a printing assembly and a protection assembly, the printing assembly comprises a printing platform and a control system, a resin groove is formed above the printing platform, and an optical assembly is arranged below the printing platform. And a scraper mechanism and a vertical displacement mechanism are arranged on the printing platform. The scraper mechanism comprises at least one scraper and a scraper driving mechanism, and is provided with a heating assembly for heating the scraper. And a plurality of first resin circulating holes for circulating resin back and forth are formed on the scrapers and / or between adjacent scrapers along the moving direction of the scrapers. And the scraper driving mechanism drives the scraper to move back and forth in the resin tank. A scraper of an existing printer is improved, the scraper has the function of cleaning a printing platform and can stir resin in a multi-flow-channel mode, and meanwhile the heating mechanism is arranged on the scraper, so that the resin can be heated more evenly.

Description

Technical Field

[0001] The present invention belongs to the technical field of additive manufacturing equipment, and particularly relates to a desktop stereolithography printer. Background Art

[0002] A desktop stereolithography printer is a compact 3D printing device based on stereolithography technology (SLA / DLP / LCD), and is applicable to scenarios such as home, education, and creative design.

[0003] Stereolithography printers include a down-dropping printer and an up-pulling printer. Among them, the down-dropping printer uses a top-down printing method and requires a large amount of resin. Therefore, the common desktop stereolithography printer is an up-pulling printer that prints from bottom to top. Currently, the following problems commonly exist in desktop stereolithography printers:

[0004] 1. After printing is completed, a spatula is needed to remove the printed part from the forming substrate. Since the up-pulling printer requires the printed part to adhere to the forming substrate so that the Z-axis mechanism can drive the forming substrate, that is, the printing process part gradually rises upward as the number of printing layers increases. This results in a relatively high requirement for the picking operation when the user uses a spatula to pick up the part, otherwise it is easy to cause the printed part to be damaged by the spatula.

[0005] 2. Since resin is a liquid with poor heat transfer ability, the existing desktop stereolithography printers generally adopt a heating method with a fixed thermocouple position, which easily leads to the problem that the resin temperature around the thermocouple is too high while the resin temperature far from the thermocouple is too low. The serious non-uniformity of the resin temperature not only affects the fluidity of the resin but also affects the formability of the resin, thereby resulting in uncontrollable defects in the printed part. Summary of the Invention

[0006] The present invention provides a desktop stereolithography printer for at least one of the problems existing in the prior art, including: a printing component and a protection component, wherein the protection component protects the printing component in the form of a housing, an outer cover, isolation, etc. The printing component includes: a printing platform and a control system. A resin tank is provided above the printing platform, and an optical component is provided below the printing platform at a position corresponding to the tank body of the resin tank. A doctor blade mechanism that moves back and forth along the inside of the resin tank is provided on the printing platform, and a vertical displacement mechanism is provided outside the resin tank along the vertical direction. The vertical displacement mechanism drives a picking mechanism and a forming substrate to move back and forth along the vertical direction, and the forming substrate can be inserted into the tank body of the resin tank and cover the working surface of the optical component.

[0007] The doctor blade mechanism includes: at least one doctor blade and a doctor blade driving mechanism, and a heating component for heating the doctor blade is provided. A plurality of first resin circulation holes for the resin to flow back and forth are formed on the doctor blade and / or between adjacent doctor blades along the moving direction of the doctor blade. The doctor blade driving mechanism drives the doctor blade to move back and forth along the inner part of the resin tank.

[0008] The optical component, the doctor blade driving mechanism, the vertical displacement mechanism are signal-connected to the control system. The control system controls the optical component and the vertical displacement mechanism to perform photocuring resin printing, and performs resin stirring treatment every K time periods based on the received information, and performs resin heating treatment based on heating control analysis.

[0009] Furthermore, the picking mechanism includes: a limiting block fixed above the resin tank and a picking connection component driven by the vertical displacement mechanism to move. A thimble plate is provided below the picking connection component, and the top plate surface of the thimble plate covers at least a part of the bottom area of the limiting block. The thimble plate is provided with a plurality of downwardly arranged thimbles. The forming substrate is arranged below the thimble plate and is provided with thimble through holes, and the number and positions of the thimble through holes cover at least the plurality of thimbles.

[0010] One side of the forming substrate facing the thimble plate is provided with guide posts, and guide post holes matching the guide posts are provided on the thimble plate at the corresponding positions of the guide posts. The guide posts pass through the guide post holes and are fixedly connected or detachably fixedly connected to the bottom of the picking connection component.

[0011] A spring is provided between the top plate surface of the forming substrate and the bottom plate surface of the thimble plate.

[0012] Furthermore, the bottom of the picking connection component is provided with a second threaded through hole, the guide post is provided with a third threaded blind hole along the vertical direction, and the first screw is provided with a second thread and a third thread corresponding to the second threaded hole and the third threaded hole respectively. The first screw is screwed and fastened to the second threaded through hole through the second thread, and is screwed and fastened to the third threaded blind hole through the third thread, and the guide post is detachably fixedly connected to the bottom of the picking connection component.

[0013] Furthermore, the doctor blade mechanism includes: a doctor blade fixing plate, at least one doctor blade, and a doctor blade driving mechanism.

[0014] The doctor blade fixing plate is provided with a doctor blade installation groove, and the doctor blade is detachably installed in the doctor blade installation groove. The doctor blade installation groove is provided with a matching second resin circulation hole at the position of the first resin circulation hole of the doctor blade. The inner side of the doctor blade installation groove is in contact with the doctor blade through a heat insulation layer.

[0015] One end of the doctor blade fixing plate straddles one side wall of the resin tank and is fixedly or detachably fixed to the doctor blade driving mechanism. The other end straddles the opposite side wall of the resin tank, and a roller is rotatably installed at the outer end of the side wall of the resin tank. The roller moves along the printing platform or a roller groove provided on the printing platform and matching the roller.

[0016] The doctor blade driving mechanism includes: a first driving device signal-connected to the control system. The driving output end of the first driving device is fixedly or detachably connected to one end of a first screw rod arranged horizontally or approximately horizontally, and drives the first screw rod to rotate. The other end of the first screw rod is rotatably connected to the printing platform. A doctor blade fixing plate connecting sleeve is screwed and sleeved on the first screw rod, and the doctor blade fixing plate connecting sleeve is fixedly or detachably fixedly connected to the doctor blade fixing plate.

[0017] Further, the vertical displacement mechanism includes: a limit guide rail fixed on the printing platform outside the resin tank and arranged in the vertical direction. A guide rail sliding buckle is slidably clamped on the limit guide rail, and the guide rail sliding buckle is fixedly connected to the connecting platform. The top of the limit guide rail is fixedly connected with a second driving device. The second driving device is signal-connected to the control system, and its driving output end is arranged downward and is fixedly or detachably fixed to one end of a second screw rod. The other end of the second screw rod is rotatably connected to the support platform at the bottom of the limit guide rail and rotates under the drive of the second driving device. The connecting platform is provided with a fourth threaded hole screwed with the second screw rod at a position corresponding to the second screw rod.

[0018] Further, the printing assembly further includes: a resin feeding and discharging mechanism. The resin feeding and discharging mechanism includes a first resin connecting pipe with one end communicating with the bottom of one side of the resin tank. The other end of the first resin connecting pipe communicates with a material port of a two-way pump through a first buffer bottle. The other material port of the two-way pump communicates with a resin storage mechanism detachably and fixedly arranged outside the protection assembly through a second resin connecting pipe. The control end of the two-way pump is signal-connected to the control system.

[0019] Further, the printing assembly further includes: a filtering mechanism. The filtering mechanism includes a fan and an air duct for guiding the air flow at the resin tank to the filter bag. The filter bag includes: a filter bag protection shell fixedly or detachably fixed on the protection assembly or the printing assembly. The air duct communicates the fan and the inside of the filter bag protection shell. The filter bag is detachably fixed inside the filter bag protection shell. The control end of the fan is signal-connected to the control system.

[0020] Further, the method for the control system to perform resin stirring processing based on the received information includes the following steps:

[0021] Step 101: Obtain the resin type A, the resin input amount B, the current ambient temperature T, and the current ambient humidity H.

[0022] Step 102 obtains the stirring treatment interval time K0 corresponding to the standard temperature T0 and the standard ambient humidity H0 from the database based on the resin type A and the resin input amount B.

[0023] Step 103 calculates the current temperature difference TC = T - T0 and the ambient humidity difference HC = H - H0, and obtains the stirring time interval adjustment parameter D based on the following formula:

[0024]

[0025] In the formula, e is the natural constant, W is the temperature adjustment coefficient, and Q is the humidity adjustment coefficient. The temperature adjustment coefficient W and the humidity adjustment coefficient Q are obtained through pre-experiments according to different resin types.

[0026] Step 104 determines the stirring treatment interval time K under the conditions of the current ambient temperature T and the current ambient humidity H by calculating K = D * K0, and performs a resin stirring treatment every K time periods.

[0027] Step 105 prints and performs steps 101 to 104 once at startup. From the start of printing to the end of printing, the current ambient temperature T and the current ambient humidity H are obtained once every preset value time period, and steps 103 to 104 are repeated once, and the newly obtained stirring treatment interval time K` is used as the interval time for the next stirring treatment.

[0028] Further, the printing component further includes: a dual-light monitoring camera. The imaging end of the dual-light monitoring camera faces the inner space of the resin tank, and the signal output end is signal-connected to the control system.

[0029] Further, after receiving the data of the dual-light monitoring camera, the control system performs supplementary stirring treatment, and the supplementary stirring treatment includes the following steps:

[0030] Step 201 converts the input information of the dual-light monitoring camera into an infrared radiation distribution map of the inner space of the resin tank.

[0031] Step 202-A judges the temperature distribution of each area in the inner space of the resin tank based on the infrared radiation distribution map of the inner space. If the temperature difference between the highest temperature and the lowest temperature in the resin area exceeds the preset first resin temperature difference threshold, a resin stirring treatment is performed once, and the interval time for the next resin stirring treatment is reset based on the stirring treatment interval time K.

[0032] Step 202-B: Convert the infrared radiation distribution map of the space in the slot into a temperature grid distribution map of the space in the slot according to the preset grid lines. If the temperature difference between the highest temperature and the lowest temperature in the resin area exceeds the preset second resin temperature difference threshold in a preset number of adjacent grids, perform a resin stirring process once, and reset the interval time for the next resin stirring process based on the stirring process interval time K.

[0033] Either Step 202-A or Step 202-B is carried out alternatively or simultaneously.

[0034] Further, after the control system receives the data of the dual-light monitoring camera, it performs heating control analysis, and the heating control analysis includes the following steps:

[0035] Step 301: Convert the input information of the dual-light monitoring camera into an infrared radiation distribution map of the space in the resin tank.

[0036] Step 302: Based on the infrared radiation distribution map of the space in the tank, judge the temperature distribution map of each area in the resin tank. When the average temperature of the resin area is lower than the preset temperature threshold, the control system controls the heating component to start and performs a resin stirring process.

[0037] Step 303: Repeat Step 302 until the average temperature of the resin area is higher than the preset post-heating temperature threshold. The control system controls the heating component to turn off, controls the squeegee to return to the initial position, and resets the interval time for the next resin stirring process based on the stirring process interval time K. The preset post-heating temperature threshold is greater than or equal to the preset temperature threshold.

[0038] Further, the method for determining the resin area includes: taking the covered area of the formed substrate in the resin tank as the first exclusion area. At this time, the part of the area in the resin tank excluding the first exclusion area is the resin area.

[0039] Further, the first exclusion area is reduced proportionally in the opposite direction of the dual-light monitoring camera based on the angle of the dual-light monitoring camera facing the resin tank as the displacement part of the vertical displacement mechanism increases in height.

[0040] Further, taking the area where the printing surface of the optical component is located in the resin tank as the second exclusion area. At this time, the exclusion area is the cumulative area of the first exclusion area and the second exclusion area, and the part of the area in the resin tank excluding the exclusion area is the resin area.

[0041] Further, the resin stirring process includes the following steps:

[0042] Step 401: Control the optical component to pause after completing the printing of this layer.

[0043] Step 402 controls the vertical displacement mechanism to drive the pick-up mechanism and the forming substrate to move upward along the vertical direction to the target height, and records the upward travel L.

[0044] Step 403 controls the squeegee mechanism to perform a preset number of round trips in the resin tank.

[0045] Step 404 controls the squeegee mechanism to return to the initial position.

[0046] Step 405 controls the vertical displacement mechanism to drive the pick-up mechanism and the forming substrate to move downward along the vertical direction, and the travel is L.

[0047] Step 406 controls the optical component to start and continue printing.

[0048] Optionally, the target height described in step 402 is: a preset height value.

[0049] Optionally, the target height U in step 402 = U0 + Ud + Uk, where U0 is the height of the squeegee mechanism, Ud is the height that the vertical displacement mechanism moves upward during printing, and Uk is an adjustment value greater than or equal to 0.

[0050] The present invention has at least one of the following advantages:

[0051] 1. The structure of the present invention is compact and meets the usage requirements of a desktop printer.

[0052] 2. The present invention improves the squeegee of the existing printer, so that while the squeegee has the function of cleaning the printing platform, it can also stir the resin in multiple channels. On the one hand, it can realize the stirring effect on the resin, so that the temperature of each area of the resin is uniform. On the other hand, it can avoid the problem that when there is too much resin, it is stirred up by the squeegee to cause excessive fluctuations and resin overflow.

[0053] 3. The present invention sets the heating mechanism on the squeegee, and can heat the resin during the movement of the squeegee according to a preset method, and stir the resin while heating, so that the resin can be heated more evenly. Description of the Drawings

[0054] Figure 1 The figure shows the main split structure schematic diagram of the desktop light-curing printer of the present invention.

[0055] Figure 2 The figure shows the structure schematic diagram of the printing component of the present invention.

[0056] Figure 3 The figure shows the structure schematic diagram of the pick-up mechanism of the present invention.

[0057] Figure 4 The figure shows Figure 3 the enlarged structure schematic diagram of part A in

[0058] Figure 5 The following is a schematic structural diagram of the guide post of the present invention.

[0059] Figure 6 The following is a schematic structural diagram of the blade mechanism of the present invention.

[0060] Figure 7 The following is a schematic structural diagram of the vertical displacement mechanism of the present invention.

[0061] Figure 8 The following is a schematic rear structure diagram of the desktop stereolithography printer of the present invention. Detailed implementation manners

[0062] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, and therefore only showing the components related to the present invention.

[0063] Please note that the "upper", "lower", "left", "right", "top", "top end", "bottom end", "bottom" and other terms used by the present invention to describe the positional relationship do not represent the absolute positional relationship between each module / component / assembly / part / element, but the relative positional relationship between each module / component / assembly / part / element.

[0064] The present invention exemplarily provides a desktop stereolithography printer, as Figure 1 shown, including: a printing component 2 and a protection component 1, wherein the protection component 1 includes a protection housing 102, a protection cover 103, and a protection isolation panel 101, and protects the printing component 2. The protection cover 103 can rotate relative to the protection housing 102 to expose or enclose the printing part of the printing component 2, facilitating the user's printing operation.

[0065] As Figure 2 shown, the printing component 2 includes: a printing platform 201 and a control system. A resin tank 202 is provided above the printing platform 201, and an optical component 203 is provided below the printing platform 201 at a position corresponding to the tank body of the resin tank 202. A blade mechanism 206 that moves back and forth along the inside of the resin tank 202 is provided on the printing platform 201, and a vertical displacement mechanism 209 is provided outside the resin tank 202 in the vertical direction. The vertical displacement mechanism 209 drives the pick-up mechanism 205 and the forming substrate 204 to move back and forth in the vertical direction, and the forming substrate 204 can be inserted into the tank body of the resin tank 202 and cover the working surface of the optical component 203.

[0066] The doctor blade mechanism 206 includes: one, two, three or the number of doctor blades 2062 required by other design needs and a doctor blade driving mechanism 2063, and a heating component 2064 for heating the doctor blade 2062 is provided. A plurality of first resin circulation holes 20621 for circulating the resin back and forth are formed on the doctor blade 2062 along the movement direction of the doctor blade 2062. Alternatively, a plurality of first resin circulation holes 20621 for circulating the resin back and forth are formed between adjacent doctor blades 2062 along the movement direction of the doctor blade 2062. The doctor blade driving mechanism 2063 drives the doctor blade 2062 to move back and forth in the resin tank 202.

[0067] The optical component 203, the doctor blade driving mechanism 2063, and the vertical displacement mechanism 209 are signal-connected to the control system. The control system controls the optical component 203 and the vertical displacement mechanism 209 to perform photocuring resin printing, and performs resin stirring treatment every K time periods based on the received information and performs resin heating treatment based on heating control analysis.

[0068] Existing desktop photocuring printers generally perform a resin stirring treatment once after printing a component. For simple and small components, this method can basically meet the need for resin uniformity. However, when printing complex or large components, whether resin needs to be stirred during the process requires the user to judge according to experience, which results in the printing effect of the component being limited by the user's subjective experience. The present invention improves this setting and performs a resin stirring treatment every K time during the printing process.

[0069] In addition, the present invention installs the heating component 2064 on the doctor blade 2062, and based on heating control analysis, starts the heating component 2064 to perform reciprocating heating in the resin with the doctor blade 2062 when necessary. Compared with the traditional fixed-point heating mode, this method has uniform heating, effectively improves the thermal average of the resin, and avoids printing defect problems caused by thermal imbalance.

[0070] Moreover, when the traditional shovel-type doctor blade moves, it will displace the resin upward and to both sides of the doctor blade, so it will cause the resin liquid to form a violent flow discharged to both sides. When the resin liquid flow collides with the side wall of the resin tank 202, strong turbulence will be formed, which is likely to cause the resin to splash. The resin during printing has a relatively high temperature. On the one hand, the splashed resin is not easy to clean, and on the other hand, there is also a potential risk of scalding the user.

[0071] Therefore, the present invention improves the structure of the squeegee. The present invention is provided with a first resin flow hole 20621 on the squeegee 2062. When the squeegee 2062 moves back and forth, the resin will flow through the first resin flow hole 20621, forming multiple relatively weak turbulent and mixed flows compared to the blade structure. On the one hand, the multiple turbulent and mixed flows of the resin will be mixed and dispersed with each other, achieving the purpose of stirring the resin. On the other hand, this turbulent and mixed flow itself is weaker than the turbulent flow formed by the blade, and the forces between adjacent turbulent flows will cancel each other out and weaken, so that the resin as a whole will not form an obvious and intense liquid flow moving outwards to the outside of the resin tank 202, which obviously reduces the possibility of resin liquid splashing during the stirring process.

[0072] The present invention exemplarily provides a picking mechanism 205, as Figure 2 and Figure 3 shown, including: a limiting block 2051 fixed above the resin tank 202 and a picking connection component 2052 driven by a vertical displacement mechanism 209. A thimble plate 2053 is provided below the picking connection component 2052, and the top plate surface of the thimble plate 2053 covers at least a part of the area at the bottom of the limiting block 2051. The thimble plate 2053 is provided with several downwardly arranged thimbles 20531. The molding substrate 204 is arranged below the thimble plate 2053 and is provided with thimble through holes 2042, and the number and positions of the thimble through holes 2042 cover at least the several thimbles 20531.

[0073] On the side of the molding substrate 204 facing the thimble plate 2053, a guide post 2041 is provided, and a guide post hole 20532 matching the guide post 2041 is provided at the corresponding position on the thimble plate 2053. The guide post 2041 passes through the guide post hole 20532 and is fixedly or detachably fixed to the bottom of the picking connection component 2052.

[0074] A spring 2054 is provided between the top plate surface of the molding substrate 204 and the bottom plate surface of the thimble plate 2053.

[0075] Compared with the prior art method of shoveling the printed component from the bottom surface of the molding substrate 204 by a blade, the present invention provides a picking mechanism that can achieve automatic and safe picking. When printing, the spring 2054 supports the thimble plate 2053, so that the thimbles 20531 will not pass through the thimble through holes 2042. At this time, the bottom end surface of the molding substrate 204 can be subjected to photocuring printing. The printed component will adhere to the bottom end surface of the molding substrate 204 and will be gradually lifted upwards by the vertical displacement mechanism 209 as the printing progresses.

[0076] After the component is printed, the vertical displacement mechanism 209 drives the ejector plate 2053 and the forming substrate 204 to continue to lift upward through the picking connection component 2052. When the ejector plate 2053 moves to the position of the limit block 2051, it is limited by the limit block 2051 and cannot continue to lift upward. At this time, the vertical displacement mechanism 209 drives the forming substrate 204 to continue to lift upward through the picking connection component 2052, while the ejector plate 2053 is restricted from lifting upward, the spring 2054 is compressed, and the ejector pin 20531 ejects from the ejector pin through hole 2042, so as to eject the component from the bottom end surface of the forming substrate 204, completing the picking. The guide post 2041 can limit the movement of the forming substrate 204 relative to the ejector plate 2053, avoiding possible damage to the ejector pin 20531 caused by misaligned movement.

[0077] The present invention completes automatic picking by ejecting the component from the bottom end surface of the forming substrate 204 through several ejector pins 20531. On the one hand, it does not require the user to perform scraping actions with a spatula, so the printed component is not easily damaged due to improper scraping by the user. On the other hand, the densely arranged ejector pins 20531 make the force on each point of the component smaller when being ejected and the total force larger, so it is difficult to damage the component during the picking process, further reducing the possibility of damage to the printed component caused by the picking action.

[0078] As needed, when the printer is printing, the user can, according to the prompt of the printer, install the receiving plate 208 at a position close to the printed component below the printed component when the vertical displacement mechanism 209 lifts the ejector plate 2053 to a position close to the limit block 2051. In this way, the ejected printed component can fall onto the receiving plate 208, and the excess resin can also flow onto the receiving plate 208, which is convenient for the user to pick up the component and can also recover the excess resin.

[0079] As needed, the elasticity of the spring 2054 can also be adjusted, so that the bottom of the ejector pin 20531 is parallel to or slightly concave inwards from the bottom end surface of the forming substrate 204, thereby reducing the excess resin remaining in the ejector pin through hole 2042.

[0080] The present invention exemplarily provides a picking connection component 2052, as Figures 3 to 5 shown. The bottom of the picking connection component 2052 is provided with a second threaded through hole 20521. The guide post 2041 is provided with a third threaded blind hole 20411 in the vertical direction. The first screw 2055 is provided with a second thread and a third thread corresponding to the second threaded hole 20521 and the third threaded hole 20411 respectively. The first screw 2055 is screwed and fastened to the second threaded through hole 20521 through the second thread, and is screwed and fastened to the third threaded blind hole 20411 through the third thread, and detachably fixes the guide post 2041 to the bottom of the picking connection component 2052.

[0081] This method enables a detachable connection mode to be formed among the pick-up connection component 2052, the molding substrate 204, and the ejector pin plate 2053. Thus, the molding substrate 204 and the ejector pin plate 2053 with ejector pins of different densities and thicknesses can be selected according to different printing components, which also facilitates the user to maintain the molding substrate 204.

[0082] The present invention exemplarily provides a doctor blade mechanism 206, as Figure 2 and Figure 6 shown, including: a doctor blade fixing plate 2061, a doctor blade 2062, and a doctor blade driving mechanism 2063. Eight first resin flow holes 20621 are provided on the doctor blade 2062. The number of the first resin flow holes 20621 provided on the doctor blade 2062 can be designed according to needs and is not necessarily eight as in this example.

[0083] The doctor blade fixing plate 2061 is provided with a doctor blade installation groove, and the doctor blade 2062 is detachably installed in the doctor blade installation groove. Eight second resin flow holes 20612 matching the positions of the first resin flow holes 20621 of the doctor blade 2062 are provided in the doctor blade installation groove. The inner side of the doctor blade installation groove is in contact with the doctor blade 2062 through a heat insulation layer. By detachably installing the doctor blade 2062 in the doctor blade installation groove, the doctor blade 2062 can be conveniently disassembled, replaced, and maintained. In addition, a heat insulation layer is added between the doctor blade 2062 and the doctor blade installation groove in the present invention, so that the heat of the doctor blade 2062 heated by the heated component 2064 is not transferred to the doctor blade fixing plate 2061 as much as possible, avoiding waste of thermal energy and also avoiding the potential possibility of scalding users caused by overheating of the doctor blade fixing plate 2061.

[0084] One end of the doctor blade fixing plate 2061 straddles one side wall of the resin tank 202 and is fixedly or detachably fixed to the doctor blade driving mechanism 2063, and the other end straddles the opposite side wall of the resin tank 202, and a roller 20614 is rotatably installed at the outer end of the side wall of the resin tank 202. The roller 20614 moves along the printing platform 201 or a roller groove provided on the printing platform 201 and matching the roller 20614.

[0085] The doctor blade driving mechanism 2063 includes: a first driving device 20631 signal-connected to the control system. The driving output end of the first driving device 20631 is fixedly or detachably connected to one end of a first screw 20632 arranged horizontally or approximately horizontally, and drives the first screw 20632 to rotate. The other end of the first screw 20632 is rotatably connected to the printing platform 201. A doctor blade fixing plate connecting sleeve 20633 is sleeved on the first screw 20632 in a threaded manner, and the doctor blade fixing plate connecting sleeve 20633 is fixedly or detachably fixedly connected to the doctor blade fixing plate 2061.

[0086] At this time, when it is necessary to control the squeegee 2062 to perform actions such as stirring, scraping the printing platform 201, and heating, the control system controls the first driving device 20631 to start, so that the first screw 20632 rotates, and then the squeegee fixing plate connecting sleeve 20633 moves back and forth along the first screw 20632 according to the rotation mode of the first screw 20632. At this time, the squeegee fixing plate connecting sleeve 20633 drives the squeegee fixing plate 2061 and the squeegee 2062 installed in the squeegee installation groove to move back and forth together. The squeegee fixing plate 2061 forms a clamping groove 20613 matching the side wall of the resin tank 202 through the side wall of the squeegee installation groove and the support plate of the roller 20614 at the position opposite to the first driving device 20631. This setting reduces the movement resistance through the setting of the roller 20614 on the one hand. On the other hand, the side wall of the resin tank 202 is clamped by the clamping groove 20613, so that when the squeegee fixing plate connecting sleeve 20633 drives the squeegee fixing plate 2061 to move, the squeegee fixing plate 2061 can drive the squeegee 2062 to move back and forth together.

[0087] When the traditional spatula-type squeegee moves, it will displace the resin upward and on both sides of the spatula, so it will cause the resin liquid to form a strong flow discharging to both sides. When the resin liquid flow collides with the side wall of the resin tank 202, strong turbulence will be formed, which is very likely to cause the resin to splash out. And the resin during printing has a relatively high temperature. On the one hand, the splashed resin is not easy to clean, and on the other hand, there is also a potential risk of scalding the user.

[0088] Therefore, the present invention improves the structure of the squeegee. The present invention is provided with a first resin circulation hole 20621 on the squeegee 2062 and a second resin circulation hole 20612 correspondingly provided on the squeegee fixing plate 2061. At this time, when the squeegee fixing plate 2061 drives the squeegee 2062 to move back and forth, the resin will flow through the first resin circulation hole 20621 and the second resin circulation hole 20612, forming multiple relatively weak turbulence and mixing flows relative to the spatula structure. On the one hand, the multiple turbulence and mixing flows of the resin will form mutual mixing and dispersion to achieve the purpose of stirring the resin. On the other hand, this turbulence and mixing flow itself is weaker than the turbulence formed by the spatula, and the acting forces between adjacent turbulences will cancel each other out and weaken, so that the resin as a whole will not form an obvious and strong liquid flow moving outside the resin tank 202, which obviously reduces the possibility of the resin liquid splashing out during the stirring process.

[0089] The present invention exemplarily provides a vertical displacement mechanism 209, such as Figure 2 and Figure 7As shown in the figure, it includes: a limit guide rail 2093 fixed on the printing platform 201 outside the resin tank 202 and arranged in the vertical direction. A guide rail slider 2095 is slidably clamped on the limit guide rail 2093, and the guide rail slider 2095 is fixedly connected to a connecting platform 2094. The top of the limit guide rail 2093 is fixedly connected to a second driving device 2091. The second driving device 2091 is signal-connected to the control system. Its driving output end is arranged downward and is fixedly or detachably fixed to one end of a second screw rod 2092. The other end of the second screw rod 2092 is rotatably connected to a support platform at the bottom of the limit guide rail 2093 and rotates under the drive of the second driving device 2091. The connecting platform 2094 is provided with a fourth threaded hole corresponding to the second screw rod 2092 and threaded with the second screw rod 2092.

[0090] At this time, when it is necessary to adjust the height of the forming substrate 204, the control system controls the second driving device 2091 to start, thereby driving the second screw rod 2092 to rotate. At this time, since the guide rail slider 2095 is clamped on the limit guide rail 2093, the connecting platform 2094 threaded with the second screw rod 2092 is restricted to move up and down relative to the second screw rod 2092.

[0091] According to needs, a connecting column 2097 and a torsion fixing mechanism 2096 can also be added to the connecting platform 2094. At this time, one end of the pick-up connecting component 2052 facing the connecting platform 2094 is provided with a connecting column groove matching the connecting column 2097. By the method of snapping the pick-up connecting component 2052 into the connecting column 2097 and fixing it through the torsion fixing mechanism 2096, the detachable fixing of the pick-up connecting component 2052 and the connecting platform 2094 can be realized.

[0092] As Figure 7 shown, the torsion fixing mechanism 2096 includes a fixing column. The top end of the fixing column is rotatably connected to a handle, and an elastic piece is provided at the lower end of the handle. The rotating connection end of the handle and the fixing column is curved. When the handle is placed horizontally, the distance between the rotation axis of the handle and the fixing column and the bottom end point of the current curved surface of the handle is Y1. When the handle is placed vertically, the distance between the rotation axis of the handle and the fixing column and the bottom end point of the current curved surface of the handle is Y2, where: Y1 > Y2. In this way, when it is necessary to snap the clamping groove onto the fixing column or pull it out, the handle is lifted vertically, so that the elastic piece moves upward along the curved surface of the handle, reducing the pressure and friction between the elastic piece and the top surface of the clamping groove and between the bottom surface of the clamping groove and the top surface of the connecting column 2097, so that the clamping groove can be snapped onto the fixing column or pulled out. When the clamping groove is snapped onto the fixing column and needs to be fixed, the handle is pressed down to the horizontal position, so that the elastic piece moves downward along the curved surface of the handle, increasing the pressure and friction between the elastic piece and the top surface of the clamping groove and between the bottom surface of the clamping groove and the top surface of the connecting column 2097, thereby realizing the fastening of the clamping groove and the connecting column 2097.

[0093] The present invention exemplarily provides a printing assembly 2, as Figure 1 and Figure 8 shown, on the basis of the above-mentioned printing assembly 2, it further includes: a resin feeding and discharging mechanism 4. The resin feeding and discharging mechanism 4 includes a first resin connecting pipe 401 with one end communicating with the bottom of one side of the resin tank 202, and the other end of the first resin connecting pipe 401 communicates with a material port of a two-way pump 402 through a first buffer bottle. The other material port of the two-way pump 402 is connected to a resin storage mechanism detachably fixed outside the protection assembly 1 through a second resin connecting pipe 403. The control end of the two-way pump 402 is signal-connected to the control system.

[0094] At this time, as needed, after printing is completed, the two-way pump 402 can be started to pump the resin in the resin tank 202 into the resin storage mechanism through the first resin connecting pipe 401 and the second resin connecting pipe 403 for resin recovery. Or a resin storage mechanism filled with clean resin can be prepared before printing, and during printing, the two-way pump 402 can be started as needed to pump the clean resin in the resin storage mechanism into the resin tank 202 through the first resin connecting pipe 401 and the second resin connecting pipe 403 for resin replenishment.

[0095] The present invention exemplarily provides a printing assembly 2, as Figure 1 and Figure 8 shown, on the basis of the above-mentioned printing assembly 2, it further includes: a filtering mechanism 207. The filtering mechanism 207 includes a fan and an air duct that lead the air flow at the resin tank 202 to a filter bag. The filter bag includes: a filter bag protection shell fixed or detachably fixed on the protection assembly 1 or the printing assembly 2, and the air duct communicates with the inside of the fan and the filter bag protection shell. The filter bag is detachably fixed inside the filter bag protection shell. The control end of the fan is signal-connected to the control system.

[0096] Since the resin used for printing usually has an odor, especially when printing, the resin needs to be heated. This setting of the present invention can absorb the odor emitted by the resin into the filter bag as much as possible for adsorption and filtration during printing, and the adsorption substance in the filter bag can be activated carbon. In this way, the odor emitted by the resin during the printing process can be reduced to the surrounding environment, improving the user experience.

[0097] As Figure 8 shown, a switch door 104 can be added at the filter bag protection shell. When the user needs to replace the filter bag, the switch door 104 can be opened, and after replacing the filter bag, the switch door 104 can be closed.

[0098] The present invention exemplarily provides a method for the control system to perform resin stirring processing based on received information, including the following steps:

[0099] Step 101: Obtain resin type A, resin input amount B, current ambient temperature T, and current ambient humidity H.

[0100] Step 102: Based on resin type A and resin input amount B, obtain the stirring treatment interval time K0 corresponding to the standard temperature T0 and standard ambient humidity H0 from the database.

[0101] Step 103: Calculate the current temperature difference TC = T - T0 and the ambient humidity difference HC = H - H0, and obtain the stirring time interval adjustment parameter D based on the following formula:

[0102]

[0103] In the formula, e is the natural constant, W is the temperature adjustment coefficient, and Q is the humidity adjustment coefficient. The temperature adjustment coefficient W and humidity adjustment coefficient Q are obtained through pre-experiments according to different resin types.

[0104] Step 104: Determine the stirring treatment interval time K under the conditions of the current ambient temperature T and current ambient humidity H by calculating K = D * K0, and perform resin stirring treatment every K time periods.

[0105] Step 105: Print. Perform steps 101 to 104 once at startup. From the start of printing to the end of printing, obtain the current ambient temperature T and current ambient humidity H every preset value time period and repeat steps 103 to 104, using the newly obtained stirring treatment interval time K` as the interval time for the next stirring treatment.

[0106] During the printing process, resin stirring needs to be performed at intervals. On the one hand, it makes the resin liquids in each area mix with each other to improve the uniformity of the resin liquid. On the other hand, it makes the resin liquids in different temperature zones mix to improve the uniformity of temperature. Since there are many types of resins and the printing environment is complex, existing desktop light-curing printers usually do not set the resin stirring interval time. That is, it is mainly up to the user to judge whether resin stirring is needed. Moreover, the uniformity of the resin and the uniformity of the resin temperature will affect the printing effect. This leads to the fact that whether the components obtained by printing on existing desktop light-curing printers are defective is mainly limited by the user's operation experience. Frequent stirring of the resin can overcome the above problems, but it seriously reduces the printing efficiency.

[0107] Through the above method, the present invention introduces the main factors affecting the resin curing speed and temperature distribution, such as resin type, resin addition amount, ambient temperature, and ambient humidity, and constructs a unique analysis method for the stirring interval time, so that a reasonable stirring frequency interval time can be obtained based on the analysis method of the present invention during the printing process to realize automatic stirring of the resin liquid, thereby ensuring the printing efficiency while keeping the resin liquid necessary uniformity and significantly improving the yield of the printed components.

[0108] The present invention exemplarily provides a printing assembly 2, as Figure 1 shown, on the basis of the above printing assembly 2, it further includes: a dual-light monitoring camera 3. The imaging end of the dual-light monitoring camera 3 faces the inner space of the resin tank 202, and the signal output end is signal-connected to the control system.

[0109] After receiving the data of the dual-light monitoring camera 3, the control system performs supplementary stirring processing, and the supplementary stirring processing includes the following steps:

[0110] Step 201 converts the input information of the dual-light monitoring camera 3 into an infrared radiation distribution map of the inner space of the resin tank 202.

[0111] Step 202-A judges the temperature distribution of each region in the resin tank 202 based on the infrared radiation distribution map of the inner space. If the temperature difference between the highest temperature and the lowest temperature in the resin region exceeds the preset first resin temperature difference threshold, a resin stirring process is performed once, and the interval time for the next resin stirring process is reset based on the stirring interval time K.

[0112] Step 202-B: Convert the infrared radiation distribution map of the inner space into a temperature grid distribution map of the inner space according to the preset grid lines. If the temperature difference between the highest temperature and the lowest temperature in the resin region in adjacent preset numbers of grids exceeds the preset second resin temperature difference threshold, a resin stirring process is performed once, and the interval time for the next resin stirring process is reset based on the stirring interval time K.

[0113] Either step 202-A or step 202-B is performed alternatively or simultaneously.

[0114] Resin temperature is an important factor affecting the yield of printed components. In the prior art, a temperature sensor is generally used to detect the temperature of a fixed site of the resin liquid to determine whether the resin liquid temperature meets the requirements and whether heating treatment is required. However, the heat transfer ability of the resin liquid is generally poor, and it is difficult to accurately obtain the overall temperature of the resin liquid by the fixed-point temperature measurement method, which is likely to cause problems of untimely heating or overheating, thus affecting the yield of printing.

[0115] The present invention uses a dual - light monitoring camera 3 to obtain the overall temperature distribution of the resin liquid area by means of area temperature measurement of the resin liquid area, and determines whether to start the stirring action to balance the resin liquid temperature based on the overall temperature distribution of the resin liquid area, which can effectively maintain the balance of the resin liquid temperature and avoid excessive regional temperature differences in the resin liquid temperature.

[0116] The present invention exemplarily provides a heating control analysis method: after the control system receives the data of the dual - light monitoring camera 3, heating control analysis is performed, and the heating control analysis includes the following steps:

[0117] Step 301 converts the input information of the dual - light monitoring camera 3 into an infrared radiation distribution map of the inner space of the resin tank 202.

[0118] Step 302 determines the spatial temperature distribution map of each area in the resin tank 202 based on the infrared radiation distribution map of the inner space of the tank. When the average temperature of the resin area is lower than the preset temperature threshold, the control system controls the heating component 2064 to start and performs resin stirring treatment.

[0119] Step 303 repeats Step 302 until the average temperature of the resin area is higher than the preset post - heating temperature threshold. The control system controls the heating component 2064 to turn off, controls the scraper 2062 to return to the initial position, and resets the interval time for the next resin stirring treatment based on the stirring treatment interval time K. The preset post - heating temperature threshold is greater than or equal to the preset temperature threshold.

[0120] The present invention determines whether heating treatment of the resin liquid is required based on the temperature distribution of the resin liquid area formed by the dual - light monitoring camera 3, effectively reducing the problems of untimely heating or over - heating existing in the existing fixed - point temperature measurement technology.

[0121] The present invention exemplarily provides a method for determining the resin area, including: taking the covered area of the forming substrate 204 in the resin tank 202 as the first exclusion area. At this time, the part of the inner area of the resin tank 202 excluding the first exclusion area is the resin area.

[0122] When the dual - light monitoring camera 3 performs regional infrared monitoring on the resin tank 202, the dual - light monitoring camera 3 will simultaneously detect the area of the resin tank 202 blocked by the forming substrate 204. Since the temperature of the forming substrate 204 is generally significantly different from the resin liquid temperature, this easily leads to a significant increase in the possibility of misjudgment when the temperature of the forming substrate 204 is included in the judgment. Therefore, it is necessary to exclude the area covered by the forming substrate 204 in the resin tank 202 to avoid misjudgment of the resin temperature.

[0123] The present invention exemplarily provides a method for determining a resin area, which further includes, on the basis of the above method for determining the resin area: as the height of the displacement part of the vertical displacement mechanism 209 increases, the first exclusion area is proportionally reduced in the opposite direction of the dual-light monitoring camera 3 based on the angle of the dual-light monitoring camera 3 facing the resin tank 202.

[0124] Since the dual-light monitoring camera 3 generally faces the resin tank 202 at a certain angle, as the molding substrate 204 moves upward, the area where the molding substrate 204 blocks the resin tank 202 in the image of the dual-light monitoring camera 3 will be proportionally reduced in the opposite direction of the dual-light monitoring camera 3.

[0125] Therefore, the present invention adaptively adjusts the first exclusion area, so as to include as much resin liquid temperature as possible in the judgment to improve the judgment accuracy.

[0126] The present invention exemplarily provides a method for determining a resin area, which further includes, on the basis of the above method for determining the resin area: the area where the printing surface of the optical component 203 is located in the resin tank 202 is used as the second exclusion area. At this time, the exclusion area is the cumulative area of the first exclusion area and the second exclusion area, and the part of the area inside the resin tank 202 excluding the exclusion area is the resin area.

[0127] When the molding substrate 204 rises to a certain height, the first exclusion area will be reduced to less than the printing surface of the optical component 203 for printing. When the resin liquid is cured under the action of the optical component 203, its temperature will be significantly different from the remaining uncured resin. Therefore, the present invention uses the area where the printing surface of the optical component 203 is located in the resin tank 202 as the second exclusion area, and accumulatively excludes the first exclusion area and the second exclusion area to avoid misjudgment caused by reasonable temperature differences generated during the curing process.

[0128] The present invention exemplarily provides a resin stirring treatment method, including the following steps:

[0129] Step 401: Control the optical component 203 to pause after completing the printing of this layer.

[0130] Step 402: Control the vertical displacement mechanism 209 to drive the picking mechanism 205 and the molding substrate 204 to move upward along the vertical direction to the target height, and record the upward travel L.

[0131] Step 403: Control the scraper mechanism 206 to perform a preset number of round trips in the resin tank 202.

[0132] Step 404: Control the scraper mechanism 206 to return to the initial position.

[0133] Step 405 controls the vertical displacement mechanism 209 to drive the pick-up mechanism 205 and the formed substrate 204 to move downward in the vertical direction, with a movement stroke of L.

[0134] Step 406 controls the optical component 203 to start and continue printing.

[0135] This method can drive the formed substrate 204 and the printed semi-finished product adhered to the formed substrate 204 to be first lifted outside the resin tank 202 by the vertical displacement mechanism 209 during stirring, and then the stirring action is performed. This can avoid the possibility of the scraper touching or damaging the printed semi-finished product during the stirring movement.

[0136] The present invention exemplarily provides a target height as described in step 402, which is: a preset height value. This method is a fixed height method, with a low requirement for computational volume. And by setting a relatively high preset height value, it can be ensured that the printed semi-finished product will not be touched or damaged during the stirring movement of the scraper.

[0137] The present invention exemplarily provides a target height as described in step 402, where the target height U = U0 + Ud + Uk, where U0 is the height of the scraper mechanism 206, Ud is the height by which the vertical displacement mechanism 209 moves upward during printing, and Uk is an adjustment value greater than or equal to 0. This method can adjust the target height U in real time through simple calculations, leaving enough clearance compared to the scraper. Thus, while ensuring that the printed semi-finished product will not be touched or damaged during the stirring movement of the scraper, unnecessary upward and downward strokes can be reduced, thereby improving the printing efficiency.

[0138] As Figure 8 shown, heat dissipation holes 105 can also be added to the protective housing 102 as needed to dissipate heat from the optical component 203.

[0139] Inspired by the ideal embodiments of the present invention described above, through the above description, relevant staff can completely make various changes and modifications within the scope not deviating from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A desktop stereolithography printer, comprising: A printing component (2) and a protection component (1), wherein the protection component (1) protects the printing component (2), and is characterized in that the printing component (2) comprises: a printing platform (201) and a control system. Above the printing platform (201), there is a resin tank (202), and below the corresponding position of the tank body of the resin tank (202) on the printing platform (201), there is an optical component (203); on the printing platform (201), there is a doctor blade mechanism (206) that moves back and forth along the inside of the resin tank (202), and a vertical displacement mechanism (209) is arranged vertically outside the resin tank (202); the vertical displacement mechanism (209) drives the pick-up mechanism (205) and the forming substrate (204) to move back and forth vertically, and the forming substrate (204) can be inserted into the tank body of the resin tank (202) and cover the working surface of the optical component (203). The doctor blade mechanism (206) comprises: at least one doctor blade (2062) and a doctor blade driving mechanism (2063), and a heating component (2064) for heating the doctor blade (2062) is provided; several first resin circulation holes (20621) for making the resin circulate back and forth are formed on the doctor blade (2062) and / or between adjacent doctor blades (2062) along the moving direction of the doctor blade (2062); the doctor blade driving mechanism (2063) drives the doctor blade (2062) to move back and forth along the inside of the resin tank (202). The optical component (203), the doctor blade driving mechanism (2063), and the vertical displacement mechanism (209) are signal-connected to the control system; the control system controls the optical component (203) and the vertical displacement mechanism (209) to perform light-curing resin printing, and performs resin stirring treatment every K time periods based on the received information and performs resin heating treatment based on heating control analysis.

2. The desktop stereolithography printer according to claim 1, wherein, The pick-up mechanism (205) comprises: a limiting block (2051) that is fixed and located above the resin tank (202), and a pick-up connection component (2052) that is driven by the vertical displacement mechanism (209) to move; below the pick-up connection component (2052), there is a thimble plate (2053), and the top plate surface of the thimble plate (2053) covers at least a part of the bottom area of the limiting block (2051); the thimble plate (2053) is provided with several downward thimbles (20531); the forming substrate (204) is arranged below the thimble plate (2053) and is provided with thimble through holes (2042), and the number and positions of the thimble through holes (2042) cover at least the several thimbles (20531). On one side of the forming substrate (204) facing the thimble plate (2053), there are guide posts (2041), and on the thimble plate (2053) at the corresponding positions of the guide posts (2041), there are guide post holes (20532) that match the guide posts (2041); the guide posts (2041) pass through the guide post holes (20532) and are fixedly or detachably fixed to the bottom of the pick-up connection component (2052). A spring (2054) is provided between the top plate surface of the formed substrate (204) and the bottom plate surface of the ejector pin plate (2053).

3. The desktop stereolithography printer according to claim 2, characterized in that, A second threaded through-hole (20521) is provided at the bottom of the pick-up connection assembly (2052). A third threaded blind-hole (20411) is provided in the guide post (2041) in the vertical direction. The first screw (2055) is provided with a second thread and a third thread corresponding to the second threaded hole (20521) and the third threaded hole (20411) respectively. The first screw (2055) is screwed and fastened to the second threaded through-hole (20521) through the second thread, and is screwed and fastened to the third threaded blind-hole (20411) through the third thread, so that the guide post (2041) is detachably and fixedly connected to the bottom of the pick-up connection assembly (2052).

4. The desktop stereolithography printer according to claim 1, wherein The doctor blade mechanism (206) includes: a doctor blade fixing plate (2061), at least one doctor blade (2062), and a doctor blade driving mechanism (2063). The doctor blade fixing plate (2061) is provided with a doctor blade installation groove, and the doctor blade (2062) is detachably installed in the doctor blade installation groove. A second resin flow hole (20612) matching the first resin flow hole (20621) of the doctor blade (2062) is provided at the position of the doctor blade installation groove. The inner side of the doctor blade installation groove is in contact with the doctor blade (2062) through a heat insulation layer. One end of the doctor blade fixing plate (2061) straddles one side wall of the resin tank (202) and is fixedly or detachably fixed to the doctor blade driving mechanism (2063). The other end straddles the opposite side wall of the resin tank (202), and a roller (20614) is rotatably installed at the outer end of the side wall of the resin tank (202). The roller (20614) moves along the printing platform (201) or a roller groove provided on the printing platform (201) and matching the roller (20614). The doctor blade driving mechanism (2063) includes: a first driving device (20631) signal-connected to the control system. The driving output end of the first driving device (20631) is fixedly or detachably connected to one end of a first screw (20632) arranged horizontally or approximately horizontally, and drives the first screw (20632) to rotate. The other end of the first screw (20632) is rotatably connected to the printing platform (201). A doctor blade fixing plate connecting sleeve (20633) is screwed and sleeved on the first screw (20632), and the doctor blade fixing plate connecting sleeve (20633) is fixedly or detachably connected to the doctor blade fixing plate (2061).

5. The desktop stereolithography printer according to claim 1, wherein The vertical displacement mechanism (209) includes: a limit guide rail (2093) fixed on the printing platform (201) outside the resin tank (202) and arranged in the vertical direction. A guide rail slider (2095) is slidably clamped on the limit guide rail (2093), and the guide rail slider (2095) is fixedly connected to a connecting platform (2094). A second driving device (2091) is fixedly connected to the top of the limit guide rail (2093). The second driving device (2091) is signal-connected to the control system, and its driving output end is arranged downward and fixedly or detachably fixed to one end of a second screw (2092). The other end of the second screw (2092) is rotatably connected to a support platform at the bottom of the limit guide rail (2093) and rotates under the drive of the second driving device (2091). The connecting platform (2094) is provided with a fourth threaded hole screwed with the second screw (2092) at a position corresponding to the second screw (2092).

6. The desktop stereolithography printer according to claim 1, wherein The printing assembly (2) further includes: a resin feeding and discharging mechanism (4). The resin feeding and discharging mechanism (4) includes a first resin connecting pipe (401) with one end communicating with the bottom of one side of the resin tank (202). The other end of the first resin connecting pipe (401) is communicated with a material port of a two-way pump (402) through a first buffer bottle. The other material port of the two-way pump (402) is communicated with a resin storage mechanism detachably fixed outside the protection assembly (1) through a second resin connecting pipe (403). The control end of the two-way pump (402) is signal-connected to the control system.

7. The desktop stereolithography printer according to claim 1, characterized in that, The printing assembly (2) further includes: a filtering mechanism (207). The filtering mechanism (207) includes a fan and an air duct that lead the air flow at the resin tank (202) to a filter bag. The filter bag includes: a filter bag protective shell fixedly or detachably fixed on the protection assembly (1) or the printing assembly (2). The air duct communicates the fan with the inside of the filter bag protective shell. The filter bag is detachably fixed inside the filter bag protective shell. The control end of the fan is signal-connected to the control system.

8. The desktop stereolithography printer according to claim 1, wherein The method for the control system to perform resin stirring processing based on the received information includes the following steps: Step 101: Obtain the resin type A, resin input amount B, current ambient temperature T, and current ambient humidity H; Step 102: Based on the resin type A and resin input amount B, obtain the stirring processing interval time K0 corresponding to the standard temperature T0 and standard ambient humidity H0 from the database; Step 103: Calculate the current temperature difference TC = T - T0 and the ambient humidity difference HC = H - H0, and obtain the stirring time interval adjustment parameter D based on the following formula: In the formula, e is the natural constant, W is the temperature adjustment coefficient, and Q is the humidity adjustment coefficient. The temperature adjustment coefficient W and humidity adjustment coefficient Q are obtained through pre-experiments according to different resin types; Step 104: Determine the stirring processing interval time K under the conditions of the current ambient temperature T and current ambient humidity H by calculating K = D * K0, and perform resin stirring processing every K time periods; Step 105: Steps 101 to 104 are performed once at the start of printing. From the start of printing to the end of printing, the current ambient temperature T and the current ambient humidity H are acquired once every preset time period, and Steps 103 to 104 are repeated. The newly obtained stirring processing interval time K` is used as the interval time for the next stirring processing.

9. The desktop stereolithography printer according to claim 1, wherein, The printing component (2) further includes: a dual-light monitoring camera (3); the imaging end of the dual-light monitoring camera (3) faces the inner space of the resin tank (202), and the signal output end is signal-connected to the control system.

10. The desktop stereolithography printer according to claim 9, characterized in that, After receiving the data from the dual-light monitoring camera (3), the control system performs supplementary stirring processing, and the supplementary stirring processing includes the following steps: Step 201: Convert the input information of the dual-light monitoring camera (3) into an infrared radiation distribution map of the inner space of the resin tank (202). Step 202-A: Based on the infrared radiation distribution map of the inner space of the tank, judge the temperature distribution of each region in the inner space of the resin tank (202). If the temperature difference between the highest temperature and the lowest temperature in the resin region exceeds the preset first resin temperature difference threshold, perform a resin stirring process once, and reset the interval time for the next resin stirring process based on the stirring processing interval time K. Step 202-B: Convert the infrared radiation distribution map of the inner space of the tank into a temperature grid distribution map of the inner space of the tank according to the preset grid lines. If the temperature difference between the highest temperature and the lowest temperature in the resin region exceeds the preset second resin temperature difference threshold in a preset number of adjacent grids, perform a resin stirring process once, and reset the interval time for the next resin stirring process based on the stirring processing interval time K. The above Steps 202-A and 202-B are selected to be performed either alternatively or simultaneously.

11. The desktop stereolithography printer according to claim 9, wherein, After receiving the data from the dual-light monitoring camera (3), the control system performs heating control analysis, and the heating control analysis includes the following steps: Step 301: Convert the input information of the dual-light monitoring camera (3) into an infrared radiation distribution map of the inner space of the resin tank (202). Step 302: Based on the infrared radiation distribution map of the inner space of the tank, judge the temperature distribution map of each region in the inner space of the resin tank (202). When the average temperature of the resin region is lower than the preset temperature threshold, the control system controls the heating component (2064) to start and performs a resin stirring process. Step 303: Repeat Step 302 until the average temperature of the resin region is higher than the preset post-heating temperature threshold. The control system controls the heating component (2064) to turn off, controls the blade (2062) to return to the initial position, and resets the interval time for the next resin stirring process based on the stirring processing interval time K. The preset post-heating temperature threshold is greater than or equal to the preset temperature threshold.

12. The desktop stereolithography printer according to any one of claims 8, 10, and 11, characterized in that, The method for determining the resin region includes: taking the covered area of the forming substrate (204) in the resin tank (202) as the first exclusion area. At this time, the part of the inner area of the resin tank (202) excluding the first exclusion area is the resin region.

13. The desktop stereolithography printer according to claim 12, wherein The first exclusion area is reduced proportionally in the opposite direction of the dual-light monitoring camera (3) based on the angle of the dual-light monitoring camera (3) facing the resin tank (202) as the displacement part of the vertical displacement mechanism (209) increases in height.

14. The desktop stereolithography printer according to claim 12, wherein, The area where the printing surface of the optical component (203) is located within the resin tank (202) is defined as the second exclusion area. At this time, the exclusion area is the cumulative area of the first exclusion area and the second exclusion area, and the part of the area inside the resin tank (202) excluding the exclusion area is the resin area.

15. The desktop stereolithography printer according to any one of claims 8, 10, and 11, wherein The resin stirring process includes the following steps: Step 401: Control the optical component (203) to pause after completing the printing of this layer. Step 402: Control the vertical displacement mechanism (209) to drive the picking mechanism (205) and the forming substrate (204) to move upward along the vertical direction to the target height, and record the upward travel distance L. Step 403: Control the squeegee mechanism (206) to perform a preset number of round trips within the resin tank (202). Step 404: Control the squeegee mechanism (206) to return to its initial position. Step 405: Control the vertical displacement mechanism (209) to drive the picking mechanism (205) and the forming substrate (204) to move downward along the vertical direction, with the travel distance being L. Step 406: Control the optical component (203) to start and continue printing.

16. The desktop stereolithography printer according to claim 14, characterized in that, The target height in Step 402 is: A preset height value; Or, The target height U = U0 + Ud + Uk, where U0 is the height of the squeegee mechanism (206), Ud is the height by which the vertical displacement mechanism (209) moves upward during printing, and Uk is an adjustment value greater than or equal to 0.

Images