3D printer hot bed utilizing vacuum adsorption model

Abstract

The invention relates to a 3D printer hot bed utilizing a vacuum adsorption model. The 3D printer hot bed comprises a lower bottom plate, a vacuum chamber, a heating layer, a magnetic adsorption layer, a printing panel, an air valve fixing plate and a vacuum logic valve. The heating layer is made of an aluminum substrate and provided with a heating layer vent hole communicated with the vacuum logic valve, the magnetic attraction layer and the printing panel are provided with magnetic attraction layer vent holes, and the air valve fixing plate is provided with a plurality of hole chamfers used for installing the vacuum logic valve. After the 3D printer completes printing of a first layer of a model, air in the vacuum chamber starts to be pumped away, and the vacuum logic valve not located below the first layer of the model enters a self-locking state to form a closed space. And the vacuum logic valve below the first layer of the model cannot be self-locked, and vacuum is formed between the model and the vacuum logic valve. The model is firmly adsorbed on the hot bed through vacuum, the edge warping phenomenon in the printing process is improved, and the model is prevented from falling off in the printing process.

Description

Technical Field

[0001] The invention relates to the field of 3D printing, and in particular to a 3D printer hot bed utilizing a vacuum adsorption model. Background Art

[0002] A 3D printer, also known as a three-dimensional printer, is an advanced additive manufacturing device that can quickly build three-dimensional objects. Based on digital model files, this technology uses special adhesive wax materials, powdered metals or plastics to create physical objects by stacking and bonding materials layer by layer.

[0003] In the current 3D printing field, the printing process of thermoplastics usually involves heating the nozzle to melt the material. In order to solve the problem of warping and deformation caused by material cooling and shrinkage during printing, a hot bed heating method is usually used. In the prior art, the hot bed is heated by the resistive thermal effect. This solution has the problem of insufficient firmness of the object, and the warping phenomenon still exists, causing the model to fall off easily. Summary of the invention

[0004] The present invention aims to provide a 3D printer hot bed utilizing vacuum adsorption of models, so as to solve the problem of model shedding caused by warping and deformation due to material cooling and shrinkage during printing.

[0005] The technical solution of the present invention is to provide a 3D printer hot bed using a vacuum adsorption model, including a lower bottom plate, a vacuum chamber, a heating layer, a magnetic layer, a printing panel, a valve fixing plate and a vacuum logic valve. The heating layer is made of an aluminum substrate, and is provided with a heating layer vent hole connected to the vacuum logic valve. The magnetic layer and the printing panel are provided with magnetic layer vent holes. The valve fixing plate is provided with a plurality of chamfered holes for installing the vacuum logic valve. The valve body of the vacuum logic valve inhales air at one end and inhales air at the other end. If there is no object blocking the air inlet end and it is in a leaking state, it will self-lock; if there is an object blocking the air inlet end, the object will be sucked. After the 3D printer completes the printing of the first layer of the model, the present invention begins to extract the air in the vacuum chamber, and the vacuum logic valve not under the first layer of the model enters a self-locking state to form a closed space. The vacuum logic valve under the first layer of the model cannot self-lock, and a vacuum is formed between the model and the vacuum logic valve. The vacuum logic valve is provided with a rubber ring and a spring, which can ensure that the printing process is not disturbed by external factors and the self-locking state is released. The present invention uses vacuum to firmly adsorb the model on the hot bed, improves the "warping edge" phenomenon during the printing process, and prevents the model from falling off during the printing process.

[0006] It is further preferred that the vacuum chamber is divided into zones, and multiple gas paths are controlled in the vacuum chamber. The interiors of the vacuum chambers are isolated from each other, thereby improving the problem that some vacuum logic valves fail to enter a self-locking state due to insufficient air extraction and enhancing airtightness.

[0007] It is further preferred that the vacuum chamber is provided with a vacuum gauge and a pressure sensor, and the pressure value is fed back by the pressure sensor to control the opening and time of the gas valve to avoid damage to the equipment and the model due to excessive vacuum. When a vacuum environment is formed in the vacuum chamber, the pressure of the vacuum gauge is read and the curve change of pressure and time is used to determine whether the system has pressure leakage, thereby ensuring the airtightness of the vacuum chamber.

[0008] Compared with the prior art, the present invention has the following beneficial effects:

[0009] In the present invention, a vacuum logic valve is installed to utilize vacuum to adsorb the model onto the hot bed. Compared with the single hot bed heating and fixing method in other solutions, the "warping edge" problem of the model during the printing process is greatly improved.

[0010] In the present invention, by installing a vacuum logic valve, the problem of the model accidentally falling off due to the close distance between the printing nozzle and the model is improved, and the printing accuracy is improved.

[0011] In the present invention, by installing a vacuum logic valve, the problem of the model being more likely to fall due to the plane tilting during the five-axis 3D printing process is solved.

[0012] In the present invention, by installing a vacuum logic valve, the problem of the model falling off when the robot arm grabs the printing panel in the fully automated 3D printer can be effectively avoided.

[0013] In the present invention, the model is fixed on the hot bed by installing a vacuum logic valve, and the material is more accurately constructed in each layer during the printing process, thereby improving the stability and accuracy of the printing process.

[0014] In the present invention, the vacuum logic valve has a simple structure, is easy to maintain and replace, and prolongs the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of a single area structure of a 3D printer hot bed using a vacuum adsorption model of the present invention, and the upper figure is an AA cross-sectional view of the lower figure;

[0016] Figure 2 This is a schematic diagram of the three-dimensional structure of the hot bed of a 3D printer using a vacuum adsorption model of the present invention;

[0017] Figure 3 It is an exploded schematic diagram of a three-dimensional structure of a hot bed of a 3D printer using a vacuum adsorption model of the present invention;

[0018] In the figure: 1. Printing panel; 2. Magnetic layer; 3. Heating layer; 4. Air valve fixing plate; 5. Lower base plate; 6. Cable bundle; 7. Air pipe; 8. Countersunk threaded hole; 9. Vacuum logic valve; 10. Through hole; 11. Threaded hole; 12. Vacuum chamber; 13. Printing panel vent; 14. Magnetic layer vent; 15. Heating layer vent; 16. Hole chamfer. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technical personnel in this field without creative work are within the scope of protection of the present invention.

[0020] like Figures 1 to 3 As shown, the present invention provides a technical solution: a 3D printer hot bed using vacuum adsorption model, comprising a lower bottom plate 5, a vacuum chamber 12, a heating layer 3, a magnetic layer 2, a printing panel 1, a valve fixing plate 4 and a vacuum logic valve 9. The heating layer 3 is made of an aluminum substrate, and is provided with a heating layer vent 15 connected to the vacuum logic valve 9, the magnetic layer 2 and the printing panel 1 are provided with a magnetic layer vent 14, and the valve fixing plate 1 is provided with a plurality of hole chamfers 16 for installing the vacuum logic valve 9. After the 3D printer completes the printing of the first layer of the model, the present invention begins to extract the air in the vacuum chamber 12, and the vacuum logic valve 9 not under the first layer of the model enters a self-locking state to form a closed space. The vacuum logic valve 9 under the first layer of the model cannot be self-locking, and a vacuum is formed between the model and the vacuum logic valve 9. The present invention uses vacuum to firmly adsorb the model on the hot bed, improves the "warping edge" phenomenon during printing, and prevents the model from falling off during printing.

[0021] In this example, Figure 3 As shown, the printed panel 1 is where the model is placed, located directly above the magnetic attraction layer 2, and the heating layer 3 is located directly below the magnetic attraction layer 2. The printed panel 1 and the heating layer 3 are tightly combined together through the magnetic attraction layer 2.

[0022] In this example, Figure 1 He Ru Figure 3 As shown, the printed panel 1 is composed of an iron sheet, and PEI powder is sprayed on the surface to form a high molecular weight cross-linked structure coating, which effectively reduces the adhesion between the model and the printed panel 1. The printed panel 1 is provided with a printed panel vent 11, and the magnetic absorption layer 2 is mixed with a certain amount of thermal conductive powder and magnetic powder, and is provided with a magnetic absorption layer vent 14.

[0023] In this example, Figure 1 and Figure 3 As shown, the heating layer 3 is composed of an aluminum substrate and is provided with a heating layer vent 15. The heating layer 3 is provided with a thermistor and a resistance wire. The thermistor detects the temperature of the heating layer in real time and transmits it to the controller through the cable bundle 6. The resistance wire utilizes the resistance thermal effect to heat the hot bed to ensure accurate control of the hot bed temperature.

[0024] In this example, Figure 1 and Figure 3 As shown, the heating layer vent 15, the magnetic layer vent 14, and the printing panel vent 13 are connected in sequence, and are connected to the vacuum chamber 12 in an un-self-locking state.

[0025] In this example, Figure 3 As shown, the air valve fixing plate 4 is located directly below the heating layer 3 and is provided with a certain number of chamfered holes 16 for installing the vacuum logic valve 12. When the printer prints the first layer of the model, it starts to extract the gas inside the vacuum chamber 12, and the vacuum logic valve 9 not below the first layer of the model enters a self-locking state to form a closed space. The vacuum logic valve 9 below the first layer of the model cannot be self-locked, and a vacuum is formed between the model and the vacuum logic valve 9, firmly adsorbing the model on the hot bed.

[0026] In this example, Figure 3 As shown, the vacuum logic valve 9 is installed in the hole chamfer 16 on the gas valve fixing plate 4 and is connected to the vacuum chamber 12 .

[0027] In this example, Figure 3 As shown, the lower base plate 5 is located directly below the air valve fixing plate 4, and the countersunk thread sequentially connects the heating layer 3, the air valve fixing plate 4, and the lower base plate 5 through the countersunk threaded hole 8, the through hole 10, and the threaded hole 11.

[0028] In this example, Figure 1 He Ru Figure 3 As shown, the vacuum chamber is a closed cavity formed by the gas valve fixing plate 4 and the lower bottom plate 5. When the internal gas is discharged to the outside through the air pipe 7, a vacuum is formed inside the cavity.

[0029] The use method and advantages of the present invention: The 3D printer hot bed using the vacuum adsorption model, when in use, the working process is as follows: Figure 1 , Figure 2 and Figure 3As shown, when the 3D printer completes printing of the first layer of the model, it begins to evacuate the gas in the vacuum chamber, and the vacuum logic valve that is not in the first layer below the model enters a self-locking state, forming a closed space. The vacuum logic valve in the first layer below the model cannot be self-locked because it is covered by an object above, forming a vacuum environment, and the model is firmly adsorbed on the hot bed. Under the action of the vacuum adsorption force, the printer continues to print the remaining model. When printing is completed, the vacuum in the vacuum chamber is released, the adsorption force between the model and the hot bed disappears, the model is removed, and printing is completed.

[0030] The above content describes the basic principles, core features and advantages of the present invention. For those skilled in the art, it should be appreciated that the present invention is not limited to the constraints of the above specific examples. The schemes mentioned in these examples and the specification are only preferred examples of the present invention and are not intended to limit the scope of application. Under the premise of maintaining consistency with the core idea of ​​the present invention and not exceeding its protection scope, the present invention allows various forms of adjustment and innovation. The protection scope of the present invention is ultimately determined by the attached claims and their equivalents.

Claims

1. A 3D printer hot bed using a vacuum adsorption model, characterized in that: It includes a lower base plate, a vacuum chamber, a heating layer, a magnetic layer, a printing panel, an air valve fixing plate and a vacuum logic valve. The heating layer is made of an aluminum substrate and is provided with a heating layer ventilation hole connected to the vacuum logic valve. The magnetic layer and the printing panel are provided with magnetic layer ventilation holes. The air valve fixing plate is provided with a plurality of chamfered holes for installing the vacuum logic valve. The printing panel is where the model is placed and is located directly above the magnetic layer. The heating layer is located directly below the magnetic layer. The printing panel and the heating layer are tightly combined together through the magnetic layer.

2. A 3D printer hot bed using a vacuum adsorption model according to claim 1, characterized in that: The vacuum chamber is divided into zones, a plurality of gas paths are controlled in the vacuum chamber, and the interiors of the vacuum chambers are isolated from each other.

3. The 3D printer hot bed using a vacuum adsorption model according to claim 1, characterized in that: The vacuum chamber is provided with a vacuum gauge and a pressure sensor, and the pressure value is fed back by the pressure sensor to control the opening degree and time of the gas valve.

4. The 3D printer hot bed using a vacuum adsorption model according to claim 1, characterized in that: The printing panel is composed of an iron sheet, and PEI powder is sprayed on the surface to form a high molecular weight cross-linked structure coating, which effectively reduces the adhesion between the model and the printing panel. The printing panel is provided with a printing panel vent 11, and the magnetic absorption layer is mixed with a certain number of thermal conductive powders and magnetic powders, and is provided with a magnetic absorption layer vent.

5. The 3D printer hot bed using a vacuum adsorption model according to claim 1, characterized in that: The heating layer is composed of an aluminum substrate and is provided with a heating layer vent. The heating layer is provided with a thermistor and a resistance wire. The thermistor detects the temperature of the heating layer in real time and transmits it to the controller through the cable bundle. The resistance wire utilizes the resistance thermal effect to heat the hot bed, thereby ensuring accurate control of the temperature of the hot bed.

6. The 3D printer hot bed using a vacuum adsorption model according to claim 1, characterized in that: The air valve fixing plate is arranged above the lower base plate and is provided with a plurality of chamfered holes for installing the vacuum logic valve. Screws are fixed to the heating layer, the air valve fixing plate and the lower base plate through countersunk threaded holes, through holes and threaded holes to form a closed cavity.

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