Ceramic 3D printing device based on gel forming process and control method

Abstract

Disclosed in the present invention are a ceramic 3D printing device based on a gel forming process and a control method. The ceramic 3D printing device based on a gel forming process comprises a feeding assembly, a discharging assembly, a scraping assembly, a material receiving assembly, a scanning assembly and a spraying assembly. The feeding assembly comprises a feeding pump and a storage hopper. The discharging assembly comprises a feeding rod, and the feeding pump can convey slurry in the storage hopper to the feeding rod. The material receiving assembly comprises a material receiving trough and a scraping plate. The spraying assembly comprises an atomization box used for atomizing a liquid, and a first spray pipe and a second spray pipe that communicate with the atomization box. The control method comprises introducing an atomized liquid into the storage hopper and the material receiving trough by means of the first spray pipe and the second spray pipe respectively. The present invention can control the water content of slurry so as to avoid premature condensation of a gelling agent and also avoid generating a refraction effect and a scattering effect of water mist due to an excessively high water content, thereby achieving a good curing effect.

Description

A ceramic 3D printing device and control method based on gel molding process Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to a ceramic 3D printing device and a control method based on a gel molding process. Background Art

[0002] Stereolithography 3D printing is an additive manufacturing technology that achieves rapid prototyping by solidifying liquid photosensitive materials layer by layer. Widely used in fields such as moldmaking and industrial design, it is also beginning to be used for the direct manufacture of some products, such as ceramics. Ceramic 3D printing equipment typically consists of a stock assembly, a scraper assembly, and a scanning assembly. The stock assembly stores the slurry, the scraper assembly delivers the slurry layer by layer to the workbench, and the scanning assembly scans and solidifies the slurry according to a pre-set pattern. This process is repeated until the desired three-dimensional sample is fully formed.

[0003] Existing photocuring 3D printing technology requires stable slurry properties to improve the quality of the finished product. To this end, existing industry players achieve this by adding gelling agents to water-based slurries. However, during the storage and molding process of the slurry, the water-based slurry easily absorbs water, and the water in the slurry evaporates. The state of the gelling agent in the slurry is affected by the water content. If the water evaporates excessively, the gelling agent will change from a dispersed state to a gel state, so the water content needs to be strictly controlled. However, existing ceramic 3D printing equipment can only control the feeding speed and molding speed, and cannot accurately control the water content in the slurry. Too little water will cause the gelling agent to coagulate prematurely, while too much water will produce obvious refraction and scattering effects that affect laser scanning curing, thereby affecting the molding quality and accuracy. Therefore, it is necessary to solve the problem of the inability to accurately control the water content of the slurry in existing ceramic 3D printing equipment.

[0004] Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a ceramic 3D printing device based on a gel molding process, which can control the water content of the slurry and obtain a better curing effect.

[0006] In order to solve the above technical problems, the present invention provides a ceramic 3D printing device based on a gel molding process, comprising a frame, a feeding assembly, a blanking assembly, a scraping assembly, a receiving assembly, a scanning assembly and a spray assembly arranged on the frame, the feeding assembly comprising a feeding pump and a storage hopper, the input end of the feeding pump being connected to the storage hopper, and the output end of the feeding pump being connected to the feeding rod of the blanking assembly.

[0007] The material receiving assembly includes a material receiving trough, a scraper plate, a forming cylinder arranged on the scraper plate, a lifting plate arranged at the bottom of the forming cylinder, and a lifting drive member connected to the lifting plate. The outlet of the feeding rod leads to the material receiving trough, the material receiving trough is connected to the scraper plate, and the lifting drive member can drive the lifting plate to rise and fall in the forming cylinder.

[0008] The scraper assembly includes a moving drive mechanism and a scraper. The moving drive mechanism can drive the scraper to move on the receiving trough and the scraper plate to scrape the slurry into the forming cylinder.

[0009] The scanning component is arranged directly above the forming cylinder and can scan and solidify the slurry on the forming cylinder according to a preset pattern.

[0010] The spray assembly includes an atomizing box for atomizing liquid, a first nozzle and a second nozzle connected to the atomizing box, the outlet of the first nozzle leads to the storage hopper, the feeding rod includes an air distribution pipe and a feeding pipe arranged in the middle of the air distribution pipe, the output end of the feeding pump is connected to the upper end of the feeding pipe, the lower end of the feeding pipe is opposite to the material receiving trough, an air inlet is provided in the air distribution pipe, the second nozzle is connected to the air inlet, an air distribution cavity is provided in the air distribution pipe which passes through the two ends of the air distribution pipe, and the air inlet is connected to the feeding pipe through the air distribution cavity.

[0011] As an improvement of the above-mentioned scheme, the ceramic 3D printing equipment based on the gel molding process also includes a pressure rod assembly, and the pressure rod assembly includes a middle pressure rod, which is arranged on both sides of the upper surface of the scraper plate. A hollow cavity is provided inside the middle pressure rod, and a middle through hole is provided in the middle of the middle pressure rod that is connected to the hollow cavity. The middle through hole faces the molding cylinder, and an air distribution port is provided at the end of the air distribution pipe that is connected to the air distribution cavity. One end of the two hollow cavities is respectively connected to the air distribution ports at both ends of the air distribution pipe, and the other end of the two hollow cavities is provided with an exhaust port.

[0012] As an improvement of the above-mentioned scheme, the pressure rod assembly also includes a rear pressure rod, which is arranged at the end of the middle pressure rod away from the feeding rod, and the sides of the two ends of the rear pressure rod are respectively connected with the exhaust port, and a rear cavity with two through ends is provided in the rear pressure rod, and the rear cavity is connected with the hollow cavity through the exhaust port, and blowing parts are respectively provided at both ends of the rear cavity, and the side of the rear pressure rod is also provided with a rear through hole connected with the rear cavity, and the rear through hole faces the side away from the scraper plate, and the air outlets of the blowing parts are all facing the rear through hole.

[0013] As an improvement of the above-mentioned scheme, the unloading assembly also includes an air separation mechanism, which includes a sliding hole provided on the side of the air separation pipe and connected to the air separation cavity, the number of the sliding holes and the air inlet are both 2 and connected to each other, and the sliding hole is provided between the air separation port and the feed pipe; the air separation mechanism also includes a telescopic driving member and a reversing block transmission-connected to the telescopic driving member, the reversing block can be inserted into the sliding hole, and the telescopic driving member can drive the reversing block to slide in the sliding hole toward the direction of the air separation port or the direction of the feed pipe, so that the air inlet is connected to the feed pipe and / or connected to the air separation port.

[0014] As an improvement to the above-mentioned solution, a sliding groove is provided on the side of the air distribution pipe, and the sliding hole is provided in the sliding groove. The reversing block includes a sealing plate and a movable plate. The movable plate is vertically fixed to the middle of the sealing plate, and the movable plate can be inserted into the sliding hole. The sealing plate can move in the sliding groove. The sealing plate is connected to the telescopic driving member, and the movable plate is perpendicular to the length direction of the air distribution cavity. The movable plate can move in the sliding hole, and the sealing plate can maintain the sealing of the sliding hole when the movable plate moves.

[0015] As an improvement of the above-mentioned solution, the ceramic 3D printing equipment based on the gel molding process also includes a humidity sensing component, which includes a material storage sensing component, a material feeding sensing component and a molding sensing component. The material storage sensing component, the material feeding sensing component and the molding sensing component are respectively arranged above the material storage hopper, above the material feeding rod and above the middle through hole.

[0016] The present invention also provides a control method for controlling the ceramic 3D printing device based on the gel molding process as described above, comprising the following steps:

[0017] a) starting the atomizing box to atomize the liquid, and introducing the atomized liquid into the storage hopper and the receiving trough through the first nozzle and the second nozzle, respectively;

[0018] b) driving the feed pump to extract slurry from the storage hopper and pass the slurry into the feed rod;

[0019] c) driving the scraper to move on the receiving trough and the scraper plate to scrape the slurry into the forming cylinder;

[0020] d) driving the scanning assembly to scan and solidify the slurry on the forming cylinder according to a preset pattern;

[0021] e) driving the lifting plate to descend to a preset height;

[0022] f) repeating steps ce until a three-dimensional model is obtained;

[0023] g) taking out the three-dimensional model, cleaning it with water or alcohol, and obtaining a sample after debinding and sintering;

[0024] In the above process, the humidity values ​​of the area where the storage hopper is located and the area where the material receiving trough is located are detected in real time, and the humidity values ​​are compared with the preset humidity parameter range. If the humidity value is not within the preset humidity parameter range, the flow rate of the first nozzle and / or the second nozzle is adjusted to make the humidity value fall within the preset humidity parameter range.

[0025] As an improvement to the above scheme, the real-time detected humidity values ​​of the area where the storage hopper is located and the area where the receiving trough is located are R1 and R2 respectively, and the preset humidity parameter ranges of the area where the storage hopper is located and the area where the receiving trough is located are R01 and R02 respectively.

[0026] The step of adjusting the flow rate of the first nozzle and / or the second nozzle so that the humidity value falls within a preset humidity parameter range includes:

[0027] When R1 is greater than the maximum value of R01, reducing the flow rate of the first nozzle;

[0028] When R1 is less than the minimum value of R01, increasing the flow rate of the first nozzle;

[0029] When R2 is greater than the maximum value of R02, reducing the flow rate of the second nozzle;

[0030] When R2 is less than the minimum value of R02, the flow rate of the second nozzle is increased.

[0031] As an improvement to the above solution, the humidity value of the area where the forming cylinder is located is detected in real time as R3, and the preset humidity parameter range of the area where the forming cylinder is located is R03.

[0032] The following steps are also included:

[0033] When R2 is greater than the maximum value of R02 and R3 is greater than the maximum value of R03, reducing the flow rate of the second nozzle;

[0034] When R2 is greater than the maximum value of R02 and R3 is within the range of R03 or R3 is less than the minimum value of R03, the telescopic drive member is started to drive the reversing block to slide a distance L1 in the direction of the feed pipe, so that the distance between the movable plate and the gas distribution port increases, and the distance between the movable plate and the feed pipe decreases;

[0035] When R2 is less than the minimum value of R02 and R3 is greater than the maximum value of R03, the telescopic drive member is started to drive the reversing block to slide a distance L2 toward the direction of the gas distribution port, so that the distance between the movable plate and the gas distribution port is reduced, and the distance between the movable plate and the feed pipe is increased;

[0036] When R2 is smaller than the minimum value of R02 and R3 is within the range of R03 or R3 is smaller than the minimum value of R03, the flow rate of the second nozzle is increased.

[0037] As an improvement to the above solution, the following steps are also included:

[0038] When R3 is greater than the maximum value of R03 and R2 is within the range of R02: start the telescopic drive member to drive the reversing block to slide L3 distance in the direction of the gas distribution port, so that the distance between the moving plate and the gas distribution port is reduced and the distance between the moving plate and the feed pipe is increased, and / or

[0039] Starting the blowing member to create negative pressure in the rear cavity, so as to discharge the atomized liquid in the area where the forming cylinder is located to the rear through hole through the middle through hole, the hollow cavity and the exhaust port;

[0040] When R3 is less than the minimum value of R03 and R2 is within the range of R02, the flow rate of the second nozzle is increased, and / or

[0041] The telescopic driving member drives the reversing block to slide a distance L4 toward the direction where the feed pipe is located, so that the distance between the moving plate and the gas distribution port increases, and the distance between the moving plate and the feed pipe decreases.

[0042] The implementation of the present invention has the following beneficial effects:

[0043] The ceramic 3D printing equipment based on the gel molding process of the present invention is provided with a feeding component, a feeding component, a scraping component, a receiving component, a scanning component and a spray component, wherein the feeding component includes a feeding pump and a storage hopper, and the slurry is stored in the storage hopper, and the feeding component includes a feeding rod, and the feeding pump can transport the slurry in the storage hopper to the feeding rod, and the receiving component includes a receiving trough and a scraper plate, and the feeding rod puts the received slurry into the receiving trough, and the scraper component scrapes the slurry layer by layer into the molding cylinder of the scraper plate, and the scanning component scans and solidifies the slurry on the molding cylinder according to a preset pattern. During this process, the atomizing box of the spray assembly can produce atomized liquid, and the first nozzle can pass the atomized liquid to the storage hopper, and the second nozzle can pass the atomized liquid to the receiving tank through the feed pipe, thereby maintaining the water content of the slurry in the storage hopper and the receiving tank, avoiding premature coagulation of the gelling agent and affecting subsequent curing and molding, and by controlling the spray flow of the first nozzle and the second nozzle, the water content in the slurry can be controlled more accurately, avoiding excessive water content causing water mist to produce refraction effect and scattering effect, and during molding, the water will evaporate normally, allowing the gelling agent to coagulate normally, thereby improving the strength of the solidified layer, thereby improving the strength of the blank and forming a better molding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] FIG1 is a schematic structural diagram of a ceramic 3D printing device based on a gel molding process according to the present invention;

[0045] 2 is a schematic structural diagram of a blanking assembly, a scraping assembly, a receiving assembly, a spray assembly, a pressure rod assembly, and a humidity sensing assembly according to the present invention;

[0046] FIG3 is a schematic diagram of a partial cross-sectional structure of a feed rod of the present invention;

[0047] FIG4 is a schematic cross-sectional view of the blanking assembly and the pressure rod assembly of the present invention;

[0048] FIG5 is a schematic structural diagram of the feed rod and the gas distribution mechanism of the present invention;

[0049] FIG6 is a schematic diagram of a first state of the feed rod and the gas distribution mechanism of the present invention;

[0050] 7 is a schematic diagram of the second state of the feed rod and the gas distribution mechanism of the present invention;

[0051] FIG8 is a schematic diagram of the feeding rod and the gas distribution mechanism of the present invention in the third state;

[0052] FIG9 is a flow chart of the control method of the present invention. DETAILED DESCRIPTION

[0053] To make the objectives, technical solutions, and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that any directional terms such as "up," "down," "left," "right," "front," "back," "inside," and "outside" that appear or will appear herein are based solely on the accompanying drawings and are not intended to limit the present invention.

[0054] Referring to Figures 1 and 2, an embodiment of the present invention discloses a ceramic 3D printing device based on a gel molding process, including a frame 9, a feeding component 1, a blanking component 2, a scraping component 3, a receiving component 4, a scanning component 5 and a spray component 6 arranged on the frame 9, multiple cavities are formed inside the box, the frame 9 is used to fix other components, the feeding component 1 is used to store and supply slurry, the blanking component 2 is used to receive the slurry of the feeding component 1, the scraping component 3 is used to transport the slurry in the blanking component 2 to the receiving component 4, the scanning component 5 is used to scan and solidify the slurry on the receiving component 4, and the spray component 6 is used to replenish water to the slurry to control the water content of the slurry. The feeding assembly 1 includes a feeding pump 11 and a storage hopper 12. The input end of the feeding pump 11 is connected to the storage hopper 12, and the slurry is stored in the storage hopper 12. The unloading assembly 2 includes a feeding rod 21. The output end of the feeding pump 11 is connected to the feeding rod 21. The feeding pump 11 can transport the slurry from the storage hopper 12 to the feeding rod 21.

[0055] The material receiving assembly 4 includes a material receiving trough 41, a scraper plate 42, a forming cylinder 43 disposed on the scraper plate 42, a lifting plate 45 disposed at the bottom of the forming cylinder 43, and a lifting drive member 44 in transmission connection with the lifting plate. The lifting plate 45 is disposed within the forming cylinder 43. The movable end of the lifting drive member 44 is connected to the bottom of the lifting plate 45. The lifting drive member 44 is capable of driving the lifting plate 45 to move up and down within the forming cylinder 43. The outlet of the feed rod 21 leads to the material receiving trough 41. The feed pump 11 passes the slurry into the material receiving trough 41 through the feed rod 21. The material receiving trough 41 is capable of temporarily storing a portion of the slurry for the scraper assembly 3 to scrape cyclically. The material receiving trough 41 is connected to the scraper plate 42. The scraper assembly 3 includes a mobile drive mechanism 31 and a scraper 32. The mobile drive mechanism 31 can drive the scraper 32 to move on the material receiving trough 41 and the scraper plate 42. The mobile drive mechanism 31 first drives the scraper 32 to scrape the slurry in the material receiving trough 41 onto the scraper plate 42, and then hangs the slurry along the scraper plate 42 until the slurry is scraped into the forming cylinder 43, where the slurry can be cured and formed. The scanning assembly 5 is located directly above the forming cylinder 43 and can scan and cure the slurry on the forming cylinder 43 according to a preset pattern. The working principle of the scanning assembly 5 is similar to that of the light curing equipment in the prior art and will not be described in detail here. The unloading assembly 2, the scraper assembly 3, the material receiving assembly 4, and the scanning assembly 5 are located in the forming cavity. During use, the scraper 32 scrapes the slurry onto the scraper plate 42. When the slurry passes through the upper opening of the forming cylinder 43, the slurry will remain in the forming cylinder 43 and form a slurry layer in the lifting plate 45. Then the scanning component 5 scans the slurry according to a preset pattern and solidifies it. After solidifying one layer, the lifting drive 44 drives the lifting plate 45 to move downward a certain distance to accommodate the next layer of slurry. After that, the scraper component 3 and the scanning component 5 repeat the above steps to complete the solidification of the next layer.

[0056] It should be noted that in the embodiment of the present invention, the slurry used is a water-based slurry and a gelling agent is added. During the laser curing process, the water content in the slurry will decrease, and the gelling agent will change from a dispersed state to a gel state. The gel converted to a gel state will increase the strength of the cured layer, thereby increasing the strength of the green body, and is conducive to increasing the speed of binder removal and sintering, and shortening the time of binder removal and sintering. Since the slurry will produce water volatilization during storage and transfer, and water volatilization will cause the state of the gelling agent to change, it is necessary to control the water content in the gelling agent during this process to avoid it from being converted into a gel state prematurely during feeding and unloading, and also to avoid obvious refraction and scattering effects due to excessive water mist during molding. In order to control the water content in the slurry, the spray assembly 6 includes an atomizing box 61 for atomizing liquid, a first nozzle 62 and a second nozzle 63 connected to the atomizing box 61, the outlet of the first nozzle 62 leads to the storage hopper 12, and the outlet of the second nozzle 63 can lead to the receiving trough 41. The atomizing box 61 is provided with an atomizing unit and a corresponding liquid. In an embodiment of the invention, the corresponding liquid is water. The atomizing unit can atomize the liquid, and the atomized liquid is driven into the first nozzle 62 and the second nozzle 63 through components such as a fan. The first nozzle 62 can pass the atomized liquid into the storage hopper 12, and the second nozzle 63 can pass the atomized liquid into the receiving tank 41, so as to replenish the water volatilized by the slurry before solidification, and by controlling the flow rate of the atomized liquid passed into the first nozzle 62 and the second nozzle 63, the speed of replenishing water in the storage hopper 12 and the receiving tank 41 can be controlled respectively to prevent excessive water addition and affect subsequent laser solidification molding.

[0057] Referring to Figure 3, the feeding rod 21 includes an air distribution pipe 211 and a feeding pipe 212 arranged in the middle of the air distribution pipe 211. The air distribution pipe 211 and the feeding pipe 212 are arranged perpendicular to each other, wherein the feeding pipe 212 is arranged vertically, and the output end of the feeding pump 11 is connected to the upper end of the feeding pipe 212, and the lower end of the feeding pipe 212 is facing the receiving trough 41, so that the slurry can be passed into the receiving trough 41 through the feeding pipe 212. The receiving trough 41 plays the role of buffer storage, which can not only enable the feeding pump 11 to quickly supply the slurry, but also ensure that the scraper assembly 3 can scrape enough slurry when it circulates back and forth, thereby improving the forming efficiency of each layer of slurry. At the same time, in order to allow the atomized liquid to be fully mixed with the slurry, an air inlet 213 is provided in the air distribution pipe 211, and the second nozzle 63 is connected to the air inlet 213, so that the atomized liquid can be passed into the air inlet 213, and the air inlet 213 is connected to the feeding pipe 212, so that the atomized liquid can be mixed with the slurry in the feeding pipe 212. Since the ventilation space between the air inlet 213 and the feeding pipe 212 is not large, the contact between the atomized liquid and the slurry can be promoted, so that the atomized liquid that is not absorbed by the slurry is less, and even if it overflows from the feeding port, it will not have a significant impact on the overall humidity of the molding cavity.

[0058] The air distribution pipe 211 is arranged along the length direction of the material receiving trough 41, and an air distribution cavity 214 is provided in the air distribution pipe 211. The air distribution cavity 214 runs through both ends of the air distribution pipe 211. There are two air inlets 213 and they are arranged on opposite sides of the feeding pipe 212. After the atomized liquid is introduced, it will enter the air distribution cavity 214. The air inlet 213 is connected to the feeding pipe 212 through the air distribution cavity 214, so that the atomized liquid can be passed into the feeding pipe 212.

[0059] The beneficial effects of the embodiments of the present invention are as follows:

[0060] The ceramic 3D printing equipment based on the gel molding process in an embodiment of the present invention is provided with a feeding component 1, a feeding component 2, a scraping component 3, a receiving component 4, a scanning component 5 and a spray component 6, wherein the feeding component 1 includes a feeding pump 11 and a storage hopper 12, and the slurry is stored in the storage hopper 12, and the feeding component 2 includes a feeding rod 21, and the feeding pump 11 can transport the slurry in the storage hopper 12 to the feeding rod 21, and the receiving component 4 includes a receiving trough 41 and a scraper plate 42, and the feeding rod 21 puts the received slurry into the receiving trough 41, and the scraper component 3 scrapes the slurry layer by layer into the molding cylinder 43 of the scraper plate 42, and the scanning component 5 scans and solidifies the slurry on the molding cylinder 43 according to a preset pattern. During this process, the atomizing box 61 of the spray assembly 6 can produce atomized liquid, and the first nozzle 62 can pass the atomized liquid to the storage hopper 12, and the second nozzle 63 can pass the atomized liquid to the receiving tank 41 through the feeding pipe 212, thereby maintaining the water content of the slurry in the storage hopper 12 and the receiving tank 41, avoiding premature coagulation of the gelling agent and affecting subsequent curing molding, and by controlling the spray flow of the first nozzle 62 and the second nozzle 63, the water content in the slurry can be controlled more accurately, avoiding excessive water content causing the water mist to produce refraction effect and scattering effect, and during molding, the water will evaporate normally, allowing the gelling agent to coagulate normally, thereby improving the strength of the solidified layer, thereby improving the strength of the blank and forming a better molding effect.

[0061] Specifically, referring to Figure 4, in order to be able to finely control the humidity of each area in the molding cavity, the ceramic 3D printing equipment based on the gel molding process also includes a pressure rod assembly 7, and the pressure rod assembly 7 includes a medium pressure rod 71. The number of the medium pressure rods 71 ​​is 2 and they are respectively arranged on both sides of the scraper plate 42. The medium pressure rod 71 extends in the direction close to the storage hopper 12, and the feeding rod 21 is arranged on the side of the scraper plate 42 away from the storage hopper 12, and the air distribution cavity 214 can be connected to the medium pressure rod 71. Specifically, the interior of the medium-pressure rod 71 is provided with a hollow cavity 711, and both ends of the air distribution pipe 211 are provided with air distribution ports 215 connected to the air distribution cavity 214. One end of the two hollow cavities 711 is respectively connected to the air distribution ports 215 at both ends of the air distribution pipe 211, so that the atomized liquid in the air distribution cavity 214 can enter the hollow cavity 711 through the air distribution ports 215. The middle part of the medium-pressure rod 71 is provided with a central through hole 712 connected to the hollow cavity 711, and the central through hole 712 faces the forming cylinder 43. Therefore, when the humidity of the area where the forming cylinder 43 is located is lower than the preset level, in order to avoid the gelling agent of the slurry in the forming cylinder 43 from coagulating prematurely, or in order to adjust the humidity level of the area where the forming cylinder 43 is located to obtain a blank with different coagulation parameters, the hollow cavity 711 can spray liquid to the area where the forming cylinder 43 is located through the central through hole 712, thereby controlling the humidity level of the area where the forming cylinder 43 is located. Furthermore, if the humidity in the area where the forming cylinder 43 is located is too high and the slurry absorbs too much water, it is easy to cause the slurry properties to be unstable, thereby affecting the accuracy of curing molding. In order to avoid excessive humidity, the other end of the two hollow cavities 711 (the end away from the air distribution port 215) is provided with an exhaust port 713. The exhaust port 713 can absorb the atomized liquid in the area where the forming cylinder 43 is located through the middle through hole 712, thereby reducing the humidity in the area where the forming cylinder 43 is located, thereby realizing the adjustable humidity of the area where the forming cylinder 43 is located.

[0062] In addition, referring to FIG4 , the pressure rod assembly 7 further includes a rear pressure rod 72, which is disposed at one end of the middle pressure rod 71 away from the feed rod 21, i.e., on the side opposite the feed rod 21. The sides of the rear pressure rod 72 at both ends are respectively connected to the exhaust ports 713 of the two hollow cavities 711. A rear cavity 721 extending through both ends is provided within the rear pressure rod 72. The rear cavity 721 is connected to the hollow cavity 711 via the exhaust ports 713. A rear through hole 722 is further provided on the side of the rear pressure rod 72, connected to the rear cavity 721. Excess atomized liquid discharged from the exhaust ports 713 can enter the rear cavity 721 and ultimately be discharged from the rear through hole 722. The rear through hole 722 faces the side away from the scraper plate 42, thereby preventing the discharged atomized liquid from returning to the area where the forming cylinder 43 is located.

[0063] In order to facilitate the discharge of the atomized liquid in the exhaust port 713, blowing pieces 73 are respectively provided at both ends of the rear cavity 721. The air outlets of the blowing pieces 73 are all facing the rear through hole 722. The blowing pieces 73 are arranged on the side of the exhaust port 713. The blowing direction of the blowing piece 73 is perpendicular to the setting direction of the hollow cavity 711. The blowing piece 73 is preferably a small fan, which can blow external air into the rear cavity 721. In the process of the blowing piece 73 blowing, negative pressure will be formed at the exhaust port 713, thereby forming negative pressure in the hollow cavity 711. By closing the air distribution port 215 at the other end of the hollow cavity 711, the middle through hole 712 will absorb the atomized liquid from the area where the forming cylinder 43 is located, thereby reducing the concentration of the atomized liquid in the area where the forming cylinder 43 is located, and then reducing the humidity in the area. The blowing member 73 is disposed in the rear pressure rod 72 instead of the intermediate pressure rod 71, and the blowing direction of the blowing member 73 is perpendicular to the arrangement direction of the hollow cavity 711. By creating a negative pressure, the atomized liquid in the hollow cavity 711 is passed into the rear cavity 721, thereby preventing the blowing member 73 from directly contacting the atomized liquid and extending the service life of the blowing member 73. In addition, the blowing members 73 are disposed at both ends of the rear cavity 721, with one side of the blowing member 73 exposed outside the rear pressure rod 72, which not only facilitates air intake but also facilitates maintenance and replacement.

[0064] Referring to FIG5 , in order to facilitate closing the gas distribution port 215, the blanking assembly 2 further includes a gas distribution mechanism 22, the gas distribution mechanism 22 includes a sliding hole 221 provided on the side of the gas distribution pipe 211 and connected to the gas distribution cavity 214, the number of the sliding holes 221 is 2 and they are respectively connected to the two gas inlets 213, both ends of the gas distribution pipe 211 are provided with a gas distribution port 215 connected to the gas distribution cavity 214, the sliding hole 221 is provided between the gas distribution port 215 and the feeding pipe 212, the gas distribution mechanism 22 It also includes a telescopic drive member 222 and a reversing block 223 that is transmission-connected to the telescopic drive member 222. The reversing block 223 can be inserted into the sliding hole 221. The sliding hole 221 provides space for the movement of the reversing block 223. The telescopic drive member 222 can drive the reversing block 223 to slide in the sliding hole 221 toward the direction of the air separation port 215 or the direction of the feed pipe 212, so that the air inlet 213 is connected to the feed pipe 212 and / or connected to the air separation port 215.

[0065] Specifically, referring to Figure 7, when the reversing block 223 moves to the end in the direction of the gas outlet 215, the portion of the reversing block 223 located in the gas outlet cavity 214 blocks the connection between the gas outlet 215 and the gas outlet cavity 214, so that the air inlet 213 can only be connected to the feed pipe 212. At this time, the slurry in the feed pipe 212 can obtain more atomized liquid, and the area where the molding cylinder 43 is located will not obtain atomized liquid. Referring to Figure 8, when the reversing block 223 moves to the end in the direction of the feed pipe 212, the portion of the reversing block 223 located in the gas outlet cavity 214 blocks the connection between the feed pipe 212 and the gas outlet cavity 214, so that the air inlet 213 can only be connected to the gas outlet 215. The atomized liquid can only enter the area where the molding cylinder 43 is located to replenish the slurry in the molding process. 6 , when the reversing block 223 is located between the feed pipe 212 and the gas distribution port 215 and has not moved to the end of either end, the atomized liquid can simultaneously enter the feed pipe 212 and the hollow cavity 711. Furthermore, by controlling the position of the reversing block 223 via the telescopic drive member 222, the ratio of the atomized liquid entering the feed pipe 212 and the hollow cavity 711 can be controlled, achieving more precise humidity regulation between different areas.

[0066] Further, referring to Figure 5, the side of the gas distribution pipe 211 is provided with a sliding groove 2111, the sliding hole 221 is provided in the sliding groove 2111, the reversing block 223 includes a sealing plate 2231 and a movable plate 2232, the movable plate 2232 is vertically fixed to the middle of the sealing plate 2231, the movable plate 2232 and the sealing plate 2231 form a T-shape, the movable plate 2232 can be inserted into the sliding hole 221, the sealing plate 2231 can move in the sliding groove 2111, the sliding groove 2111 provides a sliding space for the sealing plate 2231, and the sealing plate 2231 is provided with a sliding groove 2111. 31 is connected to the telescopic driving member 222, the movable plate 2232 can move in the sliding hole 221, the sealing plate 2231 is parallel to the length direction of the sliding hole 221, the movable plate 2232 is perpendicular to the length direction of the air separation cavity 214, and when it moves to the end, it can seal the air separation port 215 or the connection between the feed pipe 212 and the air separation cavity 214, and when the movable plate 2232 moves, the sealing plate 2231 can be attached to the sliding groove 2111 and keep the sliding hole 221 sealed, thereby preventing the leakage of the atomized liquid.

[0067] In order to precisely control the humidity of various areas within the molding cavity, the ceramic 3D printing apparatus based on the gel molding process further includes a humidity sensing assembly 8, which includes a material storage sensor 81, a material feeding sensor 82, and a molding sensor 83. The material storage sensor 81, the material feeding sensor 82, and the molding sensor 83 are respectively disposed above the material storage hopper 12, above the material feeding rod 21, and above the central through hole 712. The material storage sensor 81, the material feeding sensor 82, and the molding sensor 83 are capable of respectively sensing the humidity of the area where the material storage hopper 12 is located, the humidity of the area where the material feeding rod 21 is located, and the humidity of the area where the molding cylinder 43 is located, thereby precisely regulating the humidity of each area according to a preset humidity level, thereby achieving a better molding effect.

[0068] The embodiment of the present invention further discloses a control method for controlling the ceramic 3D printing device based on the gel molding process as described above, comprising the following steps:

[0069] a) starting the atomizing box 61 to atomize the liquid, and introducing the atomized liquid into the storage hopper 12 and the receiving trough 41 through the first nozzle 62 and the second nozzle 63 respectively;

[0070] b) driving the feed pump 11 to extract the slurry from the storage hopper 12 and pass the slurry into the feed pump 11;

[0071] In the material rod 21;

[0072] c) driving the scraper 32 to move on the receiving trough 41 and the scraper plate 42 to scrape the slurry into the forming cylinder 43;

[0073] d) driving the scanning assembly 5 to scan and solidify the slurry on the forming cylinder 43 according to a preset pattern;

[0074] e) driving the lifting plate 45 to descend to a preset height;

[0075] f) repeating steps ce until a three-dimensional model is obtained;

[0076] g) taking out the three-dimensional model, cleaning it with water or alcohol, and obtaining a sample after debinding and sintering;

[0077] In the above process, the humidity values ​​of the area where the storage hopper 12 is located and the area where the material receiving trough 41 is located are respectively detected in real time by the material storage sensor 81 and the material feeding sensor 82, and the humidity value is compared with the preset humidity parameter range. If the humidity value is not within the preset humidity parameter range, the flow rate of the first nozzle 62 and / or the second nozzle 63 is adjusted to make the humidity value fall within the preset humidity parameter range.

[0078] It should be noted that steps b to g need to be performed in sequence, and step a can be set before step b or after step c or between step b and step c. The material storage sensor 81 and the material feeding sensor 82 are both humidity sensors. The material storage sensor 81 can detect the humidity value of the area where the material storage hopper 12 is located, and the material feeding sensor 82 can detect the humidity value of the area where the material receiving trough 41 is located. By detecting the humidity values ​​of the two areas, feedback parameters can be provided for the humidity conditions of each area. The preset humidity parameter range is an interval value, which can allow the humidity of each area to be within a certain range. The first nozzle 62 and the second nozzle 63 can both independently adjust the flow rate. Therefore, the humidity value of the area where the material storage hopper 12 is located and the humidity value of the area where the material receiving trough 41 is located can be controlled by the first nozzle 62 and the second nozzle 63 respectively to be within a reasonable range.

[0079] By detecting the humidity value of each area and regulating the flow rate of the atomized liquid in the first nozzle 62 and the second nozzle 63, the humidity value of each area can be controlled within the preset humidity parameter range, thereby avoiding excessive water absorption of the slurry due to excessive humidity or excessive volatilization of the slurry due to insufficient humidity, ensuring the stability of the slurry properties, and further ensuring that the gelling agent can function stably.

[0080] Furthermore, assuming that the real-time detected humidity values ​​of the area where the storage hopper 12 is located and the area where the receiving trough 41 is located are R1 and R2, respectively, and the preset humidity parameter ranges of the area where the storage hopper 12 is located and the area where the receiving trough 41 is located are R01 and R02, respectively; the step of adjusting the flow rate of the first nozzle 62 and / or the second nozzle 63 so that the humidity value falls within the preset humidity parameter range includes:

[0081] When R1 is greater than the maximum value of R01, the flow rate of the first nozzle 62 is reduced;

[0082] When R1 is less than the minimum value of R01, the flow rate of the first nozzle 62 is increased;

[0083] When R2 is greater than the maximum value of R02, the flow rate of the second nozzle 63 is reduced;

[0084] When R2 is less than the minimum value of R02, the flow rate of the second nozzle 63 is increased.

[0085] By reducing or increasing the flow rate of the first nozzle 62, R1 is controlled to decrease or increase so that it falls within the range specified by R01; similarly, by reducing or increasing the flow rate of the second nozzle 63, R2 is controlled to decrease or increase so that it falls within the range specified by R02. In this embodiment of the present invention, the minimum and maximum values ​​of R1 are both greater than the minimum and maximum values ​​of R2, so that the first nozzle 62 can fully replenish the water content of the slurry to cope with the volatilization of water during the process of transporting the slurry from the storage hopper 12 to the receiving tank 41. In addition, the receiving tank 41 is close to the forming cylinder 43. When scraping, the scraper 32 will scrape part of the atomized liquid into the forming cylinder 43. In order to control the humidity of the area where the forming cylinder 43 is located at a low level (so that the gelling agent can smoothly transform from a dispersed state to a gel state), the amount of water that needs to be replenished in the receiving tank 41 is relatively small, so the flow rate of the second nozzle 63 is also small.

[0086] In order to further control the humidity of each area in the molding cavity and achieve a more precise control effect, the molding sensor 83 is used to detect the humidity value of the area where the molding cylinder 43 is located in real time. The humidity value is set to R3, and the preset humidity parameter range of the area where the molding cylinder 43 is located is R03.

[0087] In the embodiment of the present invention, the minimum value and the maximum value of R2 are both greater than the minimum value and the maximum value of R3, so as to ensure that the slurry in the forming cylinder 43 can evaporate water normally.

[0088] When R2 is greater than the maximum value of R02 and R3 is greater than the maximum value of R03, the flow rate of the second nozzle 63 is reduced;

[0089] When R2 is greater than the maximum value of R02 and R3 is within the range of R03 or R3 is less than the minimum value of R03, the telescopic driving member 222 is started to drive the reversing block 223 to slide a distance L1 in the direction of the feeding pipe 212, so that the distance between the moving plate 2232 and the gas distribution port 215 increases, and the distance between the moving plate 2232 and the feeding pipe 212 decreases;

[0090] When R2 is less than the minimum value of R02 and R3 is greater than the maximum value of R03, the telescopic driving member 222 is started to drive the reversing block 223 to slide a distance L2 toward the direction of the gas distribution port 215, so that the distance between the movable plate 2232 and the gas distribution port 215 is reduced, and the distance between the movable plate 2232 and the feeding pipe 212 is increased;

[0091] When R2 is smaller than the minimum value of R02 and R3 is within the range of R03 or R3 is smaller than the minimum value of R03, the flow rate of the second nozzle 63 is increased.

[0092] Referring to Figure 6 , in order to finely control the humidity in the area where the material receiving trough 41 and the area where the forming cylinder 43 are located, the flow rate of the second nozzle 63 is simultaneously supplied to the area where the material receiving trough 41 and the area where the forming cylinder 43 are located. In this embodiment of the present invention, an air distribution mechanism 22 is used to distribute the flow rate of the atomized liquid between the area where the material receiving trough 41 and the area where the forming cylinder 43 are located. Let the flow rate allocated to the area where the material receiving trough 41 be Q1, and let the flow rate allocated to the area where the forming cylinder 43 be Q2.

[0093] Specifically, when the telescopic drive member 222 drives the reversing block 223 to slide toward the feed pipe 212, the distance between the movable plate 2232 and the gas distribution port 215 increases, while the distance between the movable plate 2232 and the feed pipe 212 decreases. At this time, Q1 decreases, while Q2 increases. When the telescopic drive member 222 drives the reversing block 223 to slide toward the gas distribution port 215, the distance between the movable plate 2232 and the gas distribution port 215 decreases, while the distance between the movable plate 2232 and the feed pipe 212 increases. At this time, Q1 increases, while Q2 decreases.

[0094] When R2 is greater than the maximum value of R02 and R3 is greater than the maximum value of R03, both R2 and R3 exceed the preset humidity parameter range. Therefore, by reducing the flow rate of the second nozzle 63, both Q1 and Q2 are reduced so that the humidity of the area where the material receiving trough 41 is located and the area where the forming cylinder 43 is located fall within the range of R02 and R03, respectively.

[0095] When R2 is greater than the maximum value of R02 and R3 is within the range of R03 or R3 is less than the minimum value of R03, the flow rate of Q1 is too high, while the flow rate of Q2 is normal or too low. At this time, the telescopic drive member 222 can be activated to drive the reversing block 223 to slide a distance L1 in the direction of the feed pipe 212, thereby reducing Q1 and increasing Q2, thereby causing the humidity in the area where the receiving trough 41 and the area where the forming cylinder 43 are located to fall within the ranges of R02 and R03, respectively. If R3 is greater than the maximum value of R03 after adjustment, the blowing member 73 is activated to create a negative pressure in the rear cavity 721, causing the atomized liquid in the area where the forming cylinder 43 is located to be discharged to the rear through hole 722 through the middle through hole 712, the hollow cavity 711, and the exhaust port 713, thereby reducing the R3 value.

[0096] When R2 is less than the minimum value of R02 and R3 is greater than the maximum value of R03, the flow rate of Q1 is small, while the flow rate of Q2 is large. At this time, the telescopic drive member 222 can be started to drive the reversing block 223 to slide a distance L2 toward the direction of the air distribution port 215, so that Q1 increases and Q2 decreases.

[0097] When R2 is less than the minimum value of R02 and R3 is within the range of R03 or less than the minimum value of R03, the flow rate of Q1 is low, while the flow rate of Q2 is normal or low. In this case, the flow rate of the second nozzle 63 can be increased to simultaneously increase Q1 and Q2. If R3 is greater than the maximum value of R03 after adjustment, the blowing member 73 is activated to create a negative pressure in the rear cavity 721, causing the atomized liquid in the area of ​​the forming cylinder 43 to be discharged through the central through hole 712, the hollow cavity 711, and the exhaust port 713 to the rear through hole 722, thereby reducing the R3 value.

[0098] Furthermore, the method further comprises the following steps:

[0099] When R3 is greater than the maximum value of R03 and R2 is within the range of R02: the telescopic driving member 222 is started to drive the reversing block 223 to slide a distance L3 in the direction of the gas distribution port 215, so that the distance between the moving plate 2232 and the gas distribution port 215 is reduced and the distance between the moving plate 2232 and the feeding pipe 212 is increased, and / or

[0100] The blowing member 73 is activated to create negative pressure in the rear cavity 721 so as to discharge the atomized liquid in the area where the forming cylinder 43 is located to the rear through hole 722 through the middle through hole 712, the hollow cavity 711 and the exhaust port 713;

[0101] When R3 is less than the minimum value of R03 and R2 is within the range of R02, the flow rate of the second nozzle 63 is increased.

[0102] When R3 is greater than the maximum value of R03 and R2 is within the range of R02, the flow of Q2 is too large and the flow of Q1 is normal. At this time, there are two control methods. The first is to start the telescopic drive 222 to drive the reversing block 223 to slide a distance L3 in the direction of the gas distribution port 215, so that the distance between the moving plate 2232 and the gas distribution port 215 is reduced and the distance between the moving plate 2232 and the feed pipe 212 is increased, thereby increasing Q1 and reducing Q2. If Q2 decreases to a certain extent and is less than the minimum value of R02, the original position of the reversing block 223 is restored (that is, the telescopic drive member 222 is started to drive the reversing block 223 to slide a distance L3 in the direction of the feed pipe 212), and the blowing member 73 is started to create a negative pressure in the rear cavity 721 to discharge the atomized liquid in the area where the forming cylinder 43 is located through the middle hole 712, the hollow cavity 711 and the exhaust port 713 to the rear hole 722. At this time, the Q1 flow rate is restored, and R2 is restored to the R02 range. Since the blowing member 73 blows out part of the atomized liquid in the area where the forming cylinder 43 is located, the atomized liquid in the area where the forming cylinder 43 is located is reduced, thereby adjusting R3 to the R03 range.

[0103] The blowing member 73 may also be used for adjustment at the beginning of the adjustment, so that Q1 remains unchanged, R2 is within the range of R02, and a portion of Q2 is blown away by the blowing member 73, thereby reducing the atomized liquid distributed to the area where the forming cylinder 43 is located, thereby adjusting R3 to the range of R03.

[0104] When R3 is less than the minimum value of R03 and R2 is within the range of R02, Q2 is too small and Q1 is normal. At this time, the flow rate of the second nozzle 63 is increased to increase Q1 and Q2 at the same time. If Q1 increases too much and causes R2 to be greater than the maximum value of R02, the telescopic drive member 222 is driven to drive the reversing block 223 to slide a distance L4 in the direction of the feed pipe 212, so that the distance between the movable plate 2232 and the gas distribution port 215 increases, and the distance between the movable plate 2232 and the feed pipe 212 decreases. At this time, Q1 decreases, and Q2 continues to increase until R2 and R3 are respectively within the range of R02 and R03.

[0105] The sizes of L1-L4 are determined by the difference between the maximum and minimum values ​​of R3 and R03. Under the same humidity difference, the sizes of L1 and L4 are smaller than those of L2 and L3. This ensures that when Q2 is increased, R3 will not exceed the range of R03 too quickly.

[0106] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A ceramic 3D printing device based on a gel forming process, characterized in that, It includes a frame, a feeding component, a blanking component, a scraping component, a material receiving component, a scanning component and a spraying component provided on the frame. The feeding component includes a feeding pump and a material storage hopper. The input end of the feeding pump is communicated with the material storage hopper, and the output end of the feeding pump is communicated with the feeding rod of the blanking component; The material receiving component includes a material receiving tank, a scraping plate, a forming cylinder provided on the scraping plate, a lifting plate provided at the bottom of the forming cylinder, and a lifting driving member drivingly connected to the lifting plate. The outlet of the feeding rod leads to the material receiving tank. The material receiving tank is connected to the scraping plate, and the lifting driving member can drive the lifting plate to lift in the forming cylinder; The scraping component includes a moving driving mechanism and a scraper. The moving driving mechanism can drive the scraper to move on the material receiving tank and the scraping plate to scrape the slurry into the forming cylinder; The scanning component is provided directly above the forming cylinder and can scan and cure the slurry on the forming cylinder according to a preset pattern; The spraying component includes an atomizing tank for atomizing liquid, a first spray pipe and a second spray pipe communicated with the atomizing tank. The outlet of the first spray pipe leads to the material storage hopper. The feeding rod includes an air distribution pipe and a feeding pipe provided in the middle of the air distribution pipe. The output end of the feeding pump is communicated with the upper end of the feeding pipe. The lower end of the feeding pipe faces the material receiving tank. An air inlet is provided in the air distribution pipe. The second spray pipe is communicated with the air inlet. A gas distribution cavity penetrating through both ends of the air distribution pipe is provided in the air distribution pipe. The air inlet is communicated with the feeding pipe through the gas distribution cavity; 2. The ceramic 3D printing device based on the gel forming process according to claim 1, wherein, The ceramic 3D printing device based on the gel forming process further includes a pressing rod component. The pressing rod component includes a middle pressing rod. The middle pressing rod is provided on both sides of the upper surface of the scraping plate. A hollow cavity is provided inside the middle pressing rod. A middle through hole communicated with the hollow cavity is provided in the middle of the middle pressing rod. The middle through hole faces the forming cylinder. An air distribution port communicated with the gas distribution cavity is provided at the end of the air distribution pipe. One ends of the two hollow cavities are respectively communicated with the air distribution ports at both ends of the air distribution pipe. Exhaust ports are provided at the other ends of the two hollow cavities; 3. The ceramic 3D printing device based on the gel forming process according to claim 2, wherein the pressing rod component further includes a rear pressing rod. The rear pressing rod is provided at one end of the middle pressing rod away from the feeding rod. The side parts at both ends of the rear pressing rod are respectively communicated with the exhaust ports. A rear cavity with both ends penetrating is provided in the rear pressing rod. The rear cavity is communicated with the hollow cavity through the exhaust ports. Blowing members are respectively provided at both ends of the rear cavity. A rear through hole communicated with the rear cavity is further provided on the side part of the rear pressing rod. The rear through hole faces away from the scraping plate. The air outlets of the blowing members all face the rear through hole; 4. The ceramic 3D printing device based on the gel forming process according to claim 3, wherein, The unloading assembly also includes an air separation mechanism, which includes a sliding hole arranged on the side of the air separation pipe and connected to the air separation cavity, the sliding holes and the air inlet are both two in number and are connected to each other, and the sliding hole is arranged between the air separation port and the feeding pipe; the air separation mechanism also includes a telescopic driving member and a reversing block drivingly connected to the telescopic driving member, the reversing block can be inserted into the sliding hole, and the telescopic driving member can drive the reversing block to slide in the sliding hole toward the direction of the air separation port or the direction of the feeding pipe, so that the air inlet is connected to the feeding pipe and / or connected to the air separation port.

5. The ceramic 3D printing device based on the gel forming process according to claim 4, wherein A sliding groove is provided on the side of the air distribution pipe, and the sliding hole is provided in the sliding groove. The reversing block includes a sealing plate and a movable plate. The movable plate is vertically fixed to the middle of the sealing plate, and the movable plate can be inserted into the sliding hole. The sealing plate can move in the sliding groove. The sealing plate is connected to the telescopic driving member, and the movable plate is perpendicular to the length direction of the air distribution cavity. The movable plate can move in the sliding hole, and the sealing plate can keep the sliding hole sealed when the movable plate moves.

6. The ceramic 3D printing device based on the gel forming process according to claim 5, characterized in that, The ceramic 3D printing device based on the gel molding process also includes a humidity sensing component, which includes a material storage sensor, a material feeding sensor and a molding sensor. The material storage sensor, the material feeding sensor and the molding sensor are respectively arranged above the material storage hopper, above the material feeding rod and above the middle through hole.

7. A control method for controlling a ceramic 3D printing device based on a gel forming process as described in any one of claims 1-6, characterized in that, The following steps are involved: a) starting the atomization box to atomize the liquid, and introducing the atomized liquid into the storage hopper and the receiving tank through the first nozzle and the second nozzle respectively; b) driving the feed pump to extract slurry from the storage hopper and pass the slurry into the feed rod; c) driving the scraper to move on the material receiving trough and the scraper plate to scrape the slurry into the forming cylinder; d) driving the scanning component to scan and solidify the slurry on the forming cylinder according to a preset pattern; e) driving the lifting plate to descend to a preset height; f) repeating steps ce until a three-dimensional model is obtained; g) taking out the three-dimensional model, cleaning it with water or alcohol, and obtaining a sample after debinding and sintering; In the above process, the humidity values ​​of the area where the storage hopper is located and the area where the material receiving trough is located are detected in real time, and the humidity values ​​are compared with the preset humidity parameter range. If the humidity value is not within the preset humidity parameter range, the flow rate of the first nozzle and / or the second nozzle is adjusted to make the humidity value fall within the preset humidity parameter range.

8. The control method according to claim 7, wherein Assume that the humidity values ​​of the area where the storage hopper is located and the area where the receiving trough is located are detected in real time as R1 and R2 respectively, and the preset humidity parameter ranges of the area where the storage hopper is located and the area where the receiving trough is located are R01 and R02 respectively; The step of adjusting the flow rate of the first nozzle and / or the second nozzle so that the humidity value falls within the preset humidity parameter range comprises: When R1 is greater than the maximum value of R01, reducing the flow rate of the first nozzle; When R1 is less than the minimum value of R01, increase the flow rate of the first nozzle; When R2 is greater than the maximum value of R02, decrease the flow rate of the second nozzle; When R2 is less than the minimum value of R02, increase the flow rate of the second nozzle.

9. The control method according to claim 7, wherein The humidity value of the area where the forming cylinder is located is detected in real time as R3, and the preset humidity parameter range of the area where the forming cylinder is located is R03; It further includes the following steps: When R2 is greater than the maximum value of R02 and R3 is greater than the maximum value of R03, decrease the flow rate of the second nozzle; When R2 is greater than the maximum value of R02 and R3 is within the range of R03 or R3 is less than the minimum value of R03, start the telescopic driving member to drive the reversing block to slide towards the direction where the feed pipe is located, so that the distance between the moving plate and the air distribution port increases, and the distance between the moving plate and the feed pipe decreases; When R2 is less than the minimum value of R02 and R3 is greater than the maximum value of R03, start the telescopic driving member to drive the reversing block to slide towards the direction where the air distribution port is located, so that the distance between the moving plate and the air distribution port decreases, and the distance between the moving plate and the feed pipe increases; When R2 is less than the minimum value of R02 and R3 is within the range of R03 or R3 is less than the minimum value of R03, increase the flow rate of the second nozzle.

10. The control method according to claim 9, characterized in that, It further includes the following steps: When R3 is greater than the maximum value of R03 and R2 is within the range of R02: start the telescopic driving member to drive the reversing block to slide towards the direction where the air distribution port is located, so that the distance between the moving plate and the air distribution port decreases and the distance between the moving plate and the feed pipe increases, and / or Start the blowing member to create a negative pressure in the rear cavity to discharge the atomized liquid in the area where the forming cylinder is located through the middle through hole, the hollow cavity and the air discharge port to the rear through hole; When R3 is less than the minimum value of R03 and R2 is within the range of R02, increase the flow rate of the second nozzle, and / or Drive the telescopic driving member to drive the reversing block to slide towards the direction where the feed pipe is located, so that the distance between the moving plate and the air distribution port increases, and the distance between the moving plate and the feed pipe decreases.

Images