Trough and three-dimensional forming equipment

Abstract

The utility model provides a trough and three-dimensional forming equipment. The trough is applied to the three-dimensional forming equipment and comprises a trough frame and a release film, the trough frame comprises a light-transmitting area, an annular frame is arranged at the bottom of the trough frame, the light-transmitting area is defined by the annular frame, and the release film is used for being connected with the trough frame and covering the annular frame, the light-transmitting area and the height of at least one side of the bottom of the annular frame. The height is higher than the middle of the bottom of the annular frame. Therefore, the vacuum pulling force generated by the part, in contact with the screen, of the release film in the printing process can be reduced, so that the printing speed and the success rate of a model are improved, and the service life of the release film is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of printing equipment, in particular to a material tank and a three-dimensional forming device. Background Art

[0002] Three-dimensional forming devices, such as stereolithography printers, use stereolithography printing technology. Stereolithography uses photosensitive resin as raw material, and light with a specific wavelength and intensity is focused on the surface of the photosensitive material to solidify it from point to line and from line to surface in sequence to complete the solidification of one layer. Then, the forming platform is driven by a lifting mechanism to move a layer height in the vertical direction, and another layer is solidified. Layers are stacked on the forming platform in sequence to form a three-dimensional entity.

[0003] In the related-art stereolithography printers, the material tank is placed above the screen of the base, and the forming platform is located above the material tank through a lifting mechanism. During the printing process of the model by the printer, due to factors such as the resin in the material tank and the downward pressure of the platform, the release film will contact the screen, and a vacuum phenomenon will occur between the release film and the screen. Thus, when the forming platform drives the solidified model to move away from the release film, a vacuum adsorption force will appear between the contacted release film and the screen. The vacuum adsorption force will reduce the printing speed of the model and the success rate of the model, causing problems such as cracking of the model, detachment from the printing platform, and fault. At the same time, the service life of the release mold will also be attenuated due to the increase in the vacuum adsorption force. Summary of the Utility Model

[0004] In view of this, the utility model provides a material tank and a three-dimensional forming device. Through the improvement of the material tank frame, the vacuum adsorption force generated during the printing process at the part where the release film contacts the screen can be reduced, so as to improve the printing speed of the model and the success rate of the model, and improve the service life of the release film.

[0005] In the first aspect of the utility model, a material tank is provided, which is applied to a three-dimensional forming device. The material tank includes a material tank frame and a release film. The material tank frame includes a light-transmitting area. A circular frame is arranged at the bottom of the material tank frame, and the circular frame encloses to form the light-transmitting area. The release film is used to be connected with the material tank frame and cover the circular frame and the light-transmitting area. The height of at least one side of the bottom of the circular frame is higher than the height of the middle part of the bottom of the circular frame.

[0006] Optionally, an annular installation groove and an annular wall are further arranged on the material tank frame. The circular frame is the side close to the center of the material tank frame that encloses to form the installation groove. The annular wall is the side far from the center of the material tank frame that encloses to form the installation groove. The release film is connected with the material tank frame through the installation groove.

[0007] Optionally, the annular frame includes two opposite first side walls and two opposite second side walls. The two ends of each first side wall are respectively connected to a second side wall, and the two ends of each second side wall are respectively connected to a first side wall; the height of at least the bottom of one first side wall is higher than the height of at least part of the bottom of the second side wall.

[0008] Optionally, the second side wall includes a contact section and a deflation section located at at least one end of the second side wall. At least part of the height of the bottom of the deflation section is higher than the bottom of the contact section.

[0009] Optionally, if one end of the second side wall includes a deflation section, the deflation sections of the two second side walls are arranged oppositely.

[0010] Optionally, the deflation section includes a guiding inclined surface and a transition surface. The contact section is connected to the transition surface through the guiding inclined surface, and the height of the bottom of the transition surface is higher than the bottom of the contact section.

[0011] Optionally, the bottom of the guiding inclined surface gradually rises from the end close to the contact section to the end away from the contact section.

[0012] Optionally, the transition surface is connected to the first side wall, and the height of the bottom of the transition surface is equal to the height of the bottom of the first side wall connected to the transition surface.

[0013] Optionally, the length of one deflation section is less than one-fifth of the length of the second side wall; or the height difference between the transition surface and the contact section is 0.2 mm to 2 mm.

[0014] Optionally, if the two ends of the second side wall respectively include deflation sections, the heights of the highest points of the bottoms of the two deflation sections are equal or unequal, and the heights of the lowest points of the bottoms of the two deflation sections are equal to the height of the contact section.

[0015] Optionally, the lowest point of the annular frame is not lower than the lowest point of the annular wall; and / or the bottom of the annular wall is horizontally arranged.

[0016] In a second aspect of the present invention, a three-dimensional forming device is provided, including: a base, and the material tank according to any one of the first aspect, wherein the material tank is arranged on the base.

[0017] The material tank and the three-dimensional forming device provided by the embodiment of the present utility model, the material tank includes a material tank frame and a release film. The material tank frame includes a light-transmitting area. An annular frame surrounding the light-transmitting area is arranged at the bottom of the material tank frame. The release film is used to be connected with the material tank frame and cover the annular frame and the light-transmitting area, so that the release film and the material tank frame are hermetically connected to enclose a containing cavity for containing resin. By the height of at least one side of the bottom of the annular frame being higher than the height of the middle of the bottom of the annular frame, the release film covering the entire annular frame is actually uneven in height. When the material tank is installed above the screen of the base, the distance between the release film covering at least one side of the annular frame and the component placing the material tank, such as the screen, is greater than the distance between the release film covering the middle of the annular frame and the component placing the material tank. In this way, when the release film covering the middle of the annular frame contacts the component placing the material tank to generate a vacuum phenomenon, there will be a certain distance between the release film covering at least one side of the annular frame and the component placing the material tank, so that a venting space is formed between the release film covering at least one side of the annular frame and the screen. Thus, when the forming platform drives the cured model to move away from the release film, there is a possibility of vacuum adsorption force between the contacting release film and the component placing the material tank. The venting space can avoid the occurrence of vacuum adsorption force or reduce the magnitude of the vacuum adsorption force, so as to improve the printing speed of the model and the success rate of the model, reduce problems such as cracking, detachment from the printing platform, and fault of the model, and is beneficial to improving the service life of the release film, thereby improving the service life of the material tank and the overall reliability of the three-dimensional forming device, and is suitable for popularization and application.

[0018] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically illustrates the specific embodiments of the present application. Description of the Drawings

[0019] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present utility model. And throughout the drawings, the same reference numerals are used to represent the same components. Among them:

[0020] Figure 1 The side view of the material tank frame of the present utility model is shown;

[0021] Figure 2 Shown is Figure 1 The cross-sectional view in the A-A direction of the shown embodiment;

[0022] Figure 3 Shown is Figure 2 The partial enlarged schematic view of part A of the shown embodiment;

[0023] Figure 4 Shows a bottom view of the trough frame of the present utility model.

[0024] Among them, Figures 1 to 4 The corresponding relationship between the reference numerals in the drawings and the component names is as follows:

[0025] 100 trough frame, 110 light-transmitting area, 120 annular frame, 121 first side wall, 122 second side wall, 123 contact section, 124 air-release section, 125 guiding inclined surface, 126 transition surface, 130 installation groove, 140 annular wall. Specific embodiments

[0026] In order to more clearly understand the above objects, features and advantages of the present utility model, the present utility model will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present utility model and the features in the embodiments may be combined with each other.

[0027] Next, refer to Figures 1 to 4 Describe a trough and a stereolithography apparatus according to some embodiments of the present utility model, wherein the trough is applied to the stereolithography apparatus, and the stereolithography apparatus may be a stereolithography printer or the like.

[0028] Among them, the stereolithography apparatus includes a base, a screen and a trough. The screen is installed on the base. For example, the base is provided with a light-transmitting opening, and the screen is installed at the light-transmitting opening of the base. The trough is used to contain resin and is placed on the base. It can be understood that the stereolithography apparatus further includes a lifting mechanism and a forming platform. The lifting mechanism is installed on the base, the forming platform is connected to the lifting mechanism and is located above the trough. The lifting mechanism can drive the forming platform to lift relative to the base. Thus, using the stereolithography technology, light with a specific wavelength and intensity is focused on the resin in the trough, so that the resin solidifies on the forming platform. After a layer is cured, the lifting mechanism drives the forming platform to move a layer height in the vertical direction, and then another layer is cured, and the layers are sequentially stacked on the forming platform to form a three-dimensional entity. It can be understood that the screen is used to cooperate with the light source in the base to cure the resin in the trough. There is a trough above the screen, that is, the screen is a component for placing the trough. The trough can be placed above the screen through the trough frame. It can be understood that when the specific type of the stereolithography apparatus is different, the screen can be replaced by other components. For example, the screen can be an OLED screen, or the screen can be replaced by a light-transmitting member. The stereolithography apparatus further includes a DLP light source. Using the DLP light source and the light-transmitting member in cooperation can also realize the printing of the model. In the embodiments of the present application, the component for placing the trough is described as the screen, but it is not limited.

[0029] Such as Figure 1 、Figure 2 and Figure 4 As shown in Figure 4 , an embodiment of the first aspect of the present utility model provides a material tank, which is applied to a three-dimensional forming device. The material tank includes a material tank frame 100 and a release film. The material tank frame 100 includes a light-transmitting area 110. An annular frame 120 is provided at the bottom of the material tank frame 100. The annular frame 120 encloses to form the light-transmitting area 110. The release film is used to connect with the material tank frame 100 and cover the annular frame 120 and the light-transmitting area 110. The height of at least one side of the bottom of the annular frame 120 is higher than the height of the middle part of the bottom of the annular frame 120. It can be understood that the bottom of the annular frame 120 is used to contact the release film.

[0030] Among them, the material tank of the three-dimensional forming device includes a material tank frame 100 and a release film. The material tank frame 100 includes a light-transmitting area 110. An annular frame 120 that encloses to form the light-transmitting area 110 is provided at the bottom of the material tank frame 100. The release film is used to connect with the material tank frame 100 and cover the annular frame 120 and the light-transmitting area 110, so that the release film and the material tank frame 100 are hermetically connected to enclose a receiving cavity to receive resin. Among them, the release film is an elastic flexible member. The release film will undergo a certain deformation under the action of an external force. If the release film is severely deformed, it will affect the service life of the release film.

[0031] Among them, as Figure 4 shown, one side of the annular frame 120 can be understood as the part of the annular frame 120 distributed on any side of the center O of the light-transmitting area 110. Taking the annular frame 120 as a rectangle as an example, the annular frame 120 includes four side walls. Any one of the four side walls can be understood as one side of the annular frame 120, or any one side wall of the annular frame 120 plus a part of the other two side walls connected to this side wall. It can be understood that the annular frame 120 can also be other shapes, such as hexagon, octagon, circle, ellipse, etc.

[0032] Among them, the position of the middle part of the annular frame 120 is different relative to different sides of the annular frame 120. Specifically, as Figure 4 shown, define two mutually perpendicular lines a and b, and the intersection point of a and b passes through the center O of the light-transmitting area 110. The two intersection points of the line a and the annular frame 120 are S and T, and the two intersection points of the line b and the annular frame 120 are P and Q. When the side wall where S or T is located is taken as one side of the annular frame 120, that is, the side where T or S is located is the other side of the annular frame 120. In this case, the positions corresponding to P and Q on the annular frame 120 can be understood as the middle part of the annular frame 120; when the side wall where P or Q is located is taken as one side of the annular frame 120, that is, the side where Q or P is located is the other side of the annular frame 120. In this case, the positions corresponding to S and T on the annular frame 120 can be understood as the middle part of the annular frame 120.

[0033] Among them, the height of one side at the bottom of the annular frame 120 can be understood as the position of one side of the annular frame 120 in the vertical direction, and the height of the middle part at the bottom of the annular frame 120 can be understood as the position of the middle part at the bottom of the annular frame 120 in the vertical direction relative to one side of the specified bottom of the annular frame 120. The vertical direction can be as Figure 1 , Figure 2 and Figure 3 shown by the arrow Z in.

[0034] In this embodiment, the height of at least one side at the bottom of the annular frame 120 is higher than the height of the middle part at the bottom of the annular frame 120. That is to say, in the circumferential direction of the bottom of the annular frame 120, a part of the annular frame 120 between at least one side and the middle of the annular frame 120 is uneven in the horizontal direction. The height of at least one side at the bottom of the annular frame 120 is above the height of the middle part at the bottom of the annular frame 120 in the vertical direction. Such a setting makes the release film covering the entire annular frame 120 actually uneven in height. Specifically, the release film covering at least one side at the bottom of the annular frame 120 is above the release film covering the middle part at the bottom of the annular frame 120 in the vertical direction. Thus, when the material tank is installed above the screen of the base, the distance between the release film covering at least one side at the bottom of the annular frame 120 and the screen is greater than the distance between the release film covering the middle part at the bottom of the annular frame 120 and the screen. In this way, when the release film covering the middle part at the bottom of the annular frame 120 contacts the screen to generate a vacuum phenomenon, there will be a certain distance between the release film covering at least one side at the bottom of the annular frame 120 and the screen, so that a venting space is formed between the release film covering at least one side at the bottom of the annular frame 120 and the screen, and the venting space contains gas. Therefore, when the forming platform drives the cured model to move away from the release film, there is a possibility of vacuum adsorption force between the contacting part of the release film and the screen. However, due to the existence of the venting space, the air in the venting space will quickly enter between the part of the release film in contact with the screen and the screen to avoid the appearance of vacuum adsorption force or reduce the magnitude of the vacuum adsorption force, so as to improve the printing speed of the model and the success rate of the model, reduce problems such as cracking, detachment from the printing platform, and fault of the model, and is beneficial to improving the service life of the release film, thereby improving the service life of the material tank and the overall reliability of the three-dimensional forming equipment, and is suitable for popularization and application.

[0035] In this embodiment, since the height of at least one side at the bottom of the annular frame 120 is higher than the height of the middle part at the bottom of the annular frame 120, the bottom of the annular frame 120 is not a horizontal plane between the middle part and at least one side. Such a setting can actually be understood as that an excision operation is performed on the bottom of the annular frame 120 between at least one side and the middle part to ensure that the venting space mentioned above can be smoothly formed. At the same time, such a setting does not need to change the original structure of the release film and has a wide range of applications.

[0036] Meanwhile, in this embodiment, the bottom of the annular frame 120 is not a horizontal plane between the middle part and at least one side. For the release film covering the entire annular frame 120, when the release film covering the middle part of the bottom of the annular frame 120 comes into contact with the screen and generates a vacuum phenomenon, the release film covering at least one side of the bottom of the annular frame 120 will not come into contact with the screen. This setting, compared with the bottom of the entire annular frame in the related art being a single horizontal plane and the release film covering the annular frame all coming into contact with the screen, for the release film of the same area, the technical solution of this embodiment can reduce the contact area between the release film and the screen, so that there is a gap between at least the edge of the release film and the screen to allow air to enter, which is beneficial to reducing the vacuum adsorption force between the release film and the screen, improving the printing speed of the model and the success rate of the model, and is also beneficial to extending the service life of the release film.

[0037] Further, it can be that the height of one side of the bottom of the annular frame 120 is higher than the height of the middle part of the bottom of the annular frame 120, or it can be that the heights of both sides of the bottom of the annular frame 120 are higher than the height of the middle part of the bottom of the annular frame 120. Thus, it can meet the requirements of different structures of the annular frame 120 and different structures of the material tank frame 100. Among them, when the heights of both sides of the bottom of the annular frame 120 are higher than the height of the middle part of the annular frame 120, both sides of the bottom of the annular frame 120 can be understood as opposite sides of the annular frame 120, such as the left and right sides or the front and back sides, etc. Or, according to the specific shape of the material tank frame 100, the number and position of the side walls of the annular frame 120 with a height higher than the middle part of the bottom of the annular frame 120 can be reasonably set.

[0038] As Figure 3 and Figure 4 shown, in some possible embodiments provided by the present utility model, the material tank frame 100 is further provided with an annular installation groove 130 and an annular wall 140. The annular frame 120 is the side close to the center of the material tank frame 100 that encloses to form the installation groove 130; the annular wall 140 is the side far from the center of the material tank frame 100 that encloses to form the installation groove 130; the release film is connected to the material tank frame 100 through the installation groove 130.

[0039] That is to say, the bottom of the trough frame 100 is successively provided with an annular wall 140, a mounting groove 130, and an annular frame 120 from far away from the center of the trough frame 100 to close to the center of the trough frame 100. The annular frame 120 encloses and forms a light-transmitting area 110. The release film is connected to the trough frame 100 through the mounting groove 130. Thus, the release film can cover the annular frame 120 and the light-transmitting area 110 on the side of the mounting groove 130 close to the center of the trough frame 100 to achieve a sealed connection between the release film and the trough frame 100. It can be understood that the center of the light-transmitting area 110 and the center of the trough frame 100 can be regarded as coinciding, that is Figure 4 point O in

[0040] Specifically, the release film can be detachably connected to the trough frame 100 through a screw structure, a tensioning mechanism, etc. Among them, connection holes can be provided on the bottom wall of the mounting groove 130. The screw structure and the tensioning mechanism pass through the release film and are connected to the connection holes in the mounting groove 130 to be connected to the trough frame 100 through the mounting groove 130. Or two mounting frames can be provided to clamp the release film and be fixed together. Then, the release film and the two mounting frames are regarded as a whole and fixed on the trough frame 100 through the mounting groove 130.

[0041] Such as Figure 2 、 Figure 3 and Figure 4 As shown, in some possible implementation embodiments provided by the present invention, the annular frame 120 includes two opposite first side walls 121 and two opposite second side walls 122. The two ends of the first side wall 121 are respectively connected to one second side wall 122, and the two ends of the second side wall 122 are respectively connected to one first side wall 121; the height of the bottom of at least one first side wall 121 is higher than the height of at least part of the bottom of the second side wall 122.

[0042] In this embodiment, the annular frame 120 can be understood as a rectangular annular frame 120. The two first side walls 121 are arranged oppositely, and the two second side walls 122 are arranged oppositely. The first side wall 121, the second side wall 122, the first side wall 121, and the second side wall 122 are successively connected end to end to enclose the annular frame 120. Among them, when the two first side walls 121 of the annular frame 120 are regarded as the two sides of the annular frame 120, the part of the second side wall 122 opposite to the center of the light-transmitting area 110 can be understood as the middle part of the annular frame 120. Among them, when the first side wall 121 and the second side wall 122 are connected, a curved transition can be provided.

[0043] In this embodiment, the height of the bottom of at least one first side wall 121 is higher than the height of the bottom of at least part of the second side wall 122. In this way, when the material tank is installed above the screen of the base, the distance between the release film covering the first side wall 121 with a higher bottom height and the screen is greater than the distance between the release film covering at least part of the second side wall 122 and the screen. Thus, when at least part of the release film covering part of the second side wall 122 comes into contact with the screen to generate a vacuum phenomenon, there will be a certain distance between the release film covering the first side wall 121 with a higher bottom height and the screen, forming a venting space between the release film covering the first side wall 121 with a higher bottom height and the screen, and there is gas contained in this venting space. Therefore, the appearance of the vacuum adsorption force can be avoided or the magnitude of the vacuum adsorption force can be reduced, so as to improve the printing speed of the model and the success rate of the model, reduce problems such as cracking, detachment from the printing platform, and fault of the model, and is beneficial to improving the service life of the release film, further improving the service life of the material tank and the reliability of the whole stereolithography apparatus, and is suitable for popularization and application.

[0044] Among them, the height of the bottom of at least one first side wall 121 being higher than the height of the bottom of at least part of the second side wall 122 can be that the height of the bottom of one first side wall 121 is higher than the height of the bottom of at least part of the second side wall 122. At this time, when part of the release film covering the second side wall 122 comes into contact with the screen, there will be a gap between the release film covering the one first side wall 121 with a higher bottom height and the screen, forming a venting space. Or, the heights of the bottoms of the two first side walls 121 are both higher than the height of the bottom of at least part of the second side wall 122. At this time, when part of the release film covering the second side wall 122 comes into contact with the screen, there will be a gap between the release film covering the two first side walls 121 in contact with the screen and the screen. Since the two first side walls 121 are located on both sides of the second side wall 122, two venting spaces will be formed.

[0045] Among them, the height of the bottom of at least one first sidewall 121 is higher than the height of at least part of the bottom of the second sidewall 122. It can be that the height of the bottom of at least one first sidewall 121 is higher than the height of the entire bottom of the second sidewall 122, or the height of the bottom of at least one sidewall is higher than the height of part of the bottom of the second sidewall 122. Since both ends of the second sidewall 122 are respectively connected to a first sidewall 121, when the height of the bottom of at least one first sidewall 121 is higher than the height of the entire bottom of the second sidewall 122, a height difference can be formed at the connection position between the first sidewall 121 with a higher bottom height and the second sidewall 122 to jointly form a venting space with the screen. When the height of the bottom of at least one first sidewall 121 is higher than the height of part of the bottom of the second sidewall 122, the height at the position where the second sidewall 122 is connected to the first sidewall 121 with a higher bottom height is set flush with the first sidewall 121, and the height of the bottom at the position of the second sidewall 122 far from this end can be lower than the height of the bottom of the first sidewall 121 connected to this end. For example, the height of the middle part of the bottom of the second sidewall 122 is lower than the height of the bottom of the first sidewall 121 connected to this end.

[0046] Specifically, as Figure 1 , Figure 2 , Figure 4 shown, the material trough is placed horizontally. The annular frames 120 on the left and right sides of the material trough are regarded as the first sidewalls 121, and the annular frames 120 on the front and back sides of the material trough are regarded as the second sidewalls 122. The left - right direction of the material trough is as shown by the arrow X in Figure 2 and Figure 4 , the front - back direction of the material trough is as shown by the arrow Y in Figure 4 , and the vertical direction is as shown by the arrow Z in Figures 1 to 3 .

[0047] As Figure 2 and Figure 3 shown, in some possible implementation embodiments provided by the present utility model, the second sidewall 122 includes a contact section 123 and a venting section 124 located at at least one end of the second sidewall 122. At least part of the height of the bottom of the venting section 124 is higher than the bottom of the contact section 123.

[0048] That is to say, on the second sidewall 122, due to the arrangement of the venting section 124, the bottom of the second sidewall 122 is not a plane in the horizontal direction, that is, the bottom of the second sidewall 122 is uneven in the horizontal direction. Thus, in the case where the release film in contact with the contact section 123 is in contact with the screen, at least part of the release film in contact with the venting section 124 has a gap with the screen, so that at least part of the release film in contact with the venting section 124 forms a venting space with the screen.

[0049] Among them, the air leakage section 124 is located at at least one end of the second side wall 122. For example, the air leakage section 124 can be located at one end of the second side wall 122, or the air leakage section 124 can be located at both ends of the second side wall 122.

[0050] In one example, the air leakage section 124 is located at one end of the second side wall 122, that is, the air leakage section 124 can be provided at one end of the second side wall 122. In this way, an air leakage space is formed between the release film covering the second side wall 122 and the screen at the position corresponding to the air leakage section 124, and the air leakage space is located at the end of the second side wall 122, that is, the air leakage space is located at the edge of the release film. Therefore, the magnitude of the vacuum adsorption force of the release film in contact with the screen can be reduced, so as to improve the printing speed of the model and the success rate of the model, reduce problems such as cracking, detachment from the printing platform, and fault of the model, and is beneficial to improving the service life of the release film, thereby improving the service life of the material tank and the overall reliability of the three-dimensional forming device, and is suitable for popularization and application.

[0051] Such as Figure 2 As shown, in another example, the air leakage section 124 is located at both ends of the second side wall 122, that is, the air leakage section 124 can be provided at both ends of the second side wall 122. In this way, two air leakage spaces are formed between the release film covering the second side wall 122 and the screen at the positions corresponding to the two air leakage sections 124, and both air leakage spaces are located at the edge of the release film. Therefore, the magnitude of the vacuum adsorption force of the release film in contact with the screen can be further reduced, so as to further improve the printing speed of the model and the success rate of the model, reduce problems such as cracking, detachment from the printing platform, and fault of the model, and is beneficial to improving the service life of the release film, thereby improving the service life of the material tank and the overall reliability of the three-dimensional forming device, and is suitable for popularization and application.

[0052] Among them, at least part of the height of the bottom of the air leakage section 124 is higher than the bottom of the contact section 123. It can be that the height of the bottom of the entire air leakage section 124 is higher than the height of the bottom of the contact section 123; or it can be that the height of the bottom of part of the air leakage section 124 is higher than the height of the bottom of the contact section 123, and the height of the bottom of the other part of the air leakage section 124 is equal to the height of the bottom of the contact section 123.

[0053] In some possible embodiments provided by the present invention, if one end of the second side wall 122 includes the air leakage section 124, the air leakage sections 124 of the two second side walls 122 are arranged oppositely.

[0054] That is to say, air leakage sections 124 are provided at opposite ends of the two side walls. That is, the same first side wall 121 connects two air leakage sections 124 provided oppositely on two second side walls 122. It can be understood that the height of the bottom of the first side wall 121 connected to the two air leakage sections 124 of the two second side walls 122 is higher than the height of the bottom of the contact section 123. In this way, when the release film covering the contact section 123 contacts the screen, a release space is formed among the release film covering the two air leakage sections 124, the release film covering the first side wall 121 connecting the two air leakage sections 124, and the screen.

[0055] Specifically, as Figure 2 shown, air leakage sections 124 are provided at the same end of the two second side walls 122, and no air leakage sections 124 are provided on the two first side walls 121. That is, the first side wall 121 is a horizontal plane. Among them, the first side wall 121 connected to the two air leakage sections 124 is flush with the end of the two air leakage sections 124 close to the first side wall 121, and the height of the bottom of the first side wall 121 is higher than the height of the bottom of the contact section 123 of the second side wall 122. Thereby, the release film covering the two air leakage sections 124 and the first side wall 121 of the two air leakage sections 124 warps upward relative to the release film covering the contact section 123 of the two second side walls 122. That is, the release film covering the contact section 123 of the two second side walls 122 will contact the screen, and there is a gap between the release film covering the two air leakage sections 124 and the first side wall 121 and the screen to form a release space. This kind of setting can ensure that the release space has sufficient volume to effectively reduce the vacuum adsorption force between the release film and the screen, improve the printing speed of the model and the success rate of the model, and is beneficial to extending the service life of the release film.

[0056] It can be understood that if both ends of the second side wall 122 include air leakage sections 124, the air leakage sections 124 of the two second side walls 122 are also arranged oppositely. That is, both ends of each second side wall 122 include air leakage sections 124. In this way, both ends of each first side wall 121 are respectively connected to an air leakage section 124 of a second side wall 122, so that the release film covering the two first side walls 121 and covering the four air leakage sections 124 forms a release space with the screen respectively near the two first side walls 121. That is, in this case, the release film and the screen can form two release spaces.

[0057] As Figure 3 shown, in some possible implementation embodiments provided by the present utility model, the air leakage section 124 includes a guiding inclined surface 125 and a transition surface 126, and the contact section 123 is connected to the transition surface 126 through the guiding inclined surface 125, and the height of the bottom of the transition surface 126 is higher than the height of the bottom of the contact section 123.

[0058] That is to say, the transition surface 126 is located at the end of the second side wall 122. The transition surface 126 is connected to the first side wall 121. Since the height of the bottom of the transition surface 126 is higher than the height of the bottom of the contact section 123, it can be ensured that when the release film covering the contact section 123 contacts the screen, there is a gap between the release film covering the transition surface 126 and the screen, so as to ensure that the air release space can be reliably formed.

[0059] Among them, the transition surface 126 is connected to the first side wall 121, and the height of the bottom of the transition surface 126 is equal to the height of the bottom of the first side wall 121 connected to the transition surface 126. Thus, it can be ensured that the height of the bottom of the first side wall 121 is higher than the height of the bottom of the contact section 123, and an air release space can be formed among the release film covering the first side wall 121, the release film covering the transition surface 126, and the screen. At the same time, this setting enables the release film to be smoothly transitioned between the bottom of the first side wall 121 and the bottom of the transition surface 126, greatly reducing the height difference between the release film covering the transition surface 126 and the release film covering the first side wall 121 connected to the transition surface 126, which is beneficial to improving the service life of the release film.

[0060] As Figure 3 shown, in some possible embodiments provided by the present utility model, the bottom of the guiding inclined surface 125 gradually rises from the end close to the contact section 123 to the end far from the contact section 123.

[0061] Among them, the setting of the guiding inclined surface 125 can ensure that the height of the bottom of the transition surface 126 is higher than the height of the bottom of the contact section 123, so that the bottom of the second side wall 122 is not a plane in the horizontal direction. At the same time, by reasonably setting the slope of the guiding inclined surface 125, the height difference between the two ends of the bottom of the air release section 124 can be ensured to be within a reasonable range, and then the air release space formed between the release film covering the air release section 124 and the screen is reasonable, so as to avoid or reduce the vacuum adsorption force generated between the release film opposite to the bottom opening and the screen.

[0062] Specifically, the slope of the guiding inclined surface 125 can be greater than 0.1 degree and less than 3 degrees. Specifically, the slope of the guiding inclined surface 125 can be 0.1 degree, 0.2 degree, 0.5 degree, 1 degree, 1.3 degree, 1.5 degree, 2 degrees, 2.5 degrees, 3 degrees, or other angles, etc.

[0063] As Figure 3As shown, in the above embodiment, the lowest point at the bottom of the guiding inclined surface 125 is flush with the bottom of the contact section 123, so that the guiding inclined surface 125 has a good guiding effect on the release film from the covering transition surface 126 to the covering contact section 123. Under the guiding effect of the guiding inclined surface 125, the release film can extend obliquely downward from the transition surface 126 to the covering contact section 123. Thus, the height difference between the two ends of the air release section 124 of the release film can be minimized, avoiding the problem that the large height difference between the two ends of the air release section 124 affects the service life of the release film, which is beneficial to extending the service life of the release film.

[0064] Furthermore, the bottom of the transition surface 126 is horizontally arranged and connected to the guiding inclined surface 125, so that the transition surface 126 and the guiding inclined surface 125 enclose a stepped shape. As a result, a stepped cut is made on the bottom surface of the material tank frame 100 on the side of the installation groove 130 close to the light-transmitting area 110, that is, a stepped cut is made on the annular frame 120. Thus, good sealing performance can be ensured after the release film is connected to the installation groove 130. At the same time, this setting does not require changing the structure of the release film and has a wide range of applications.

[0065] Among them, the lowest point at the bottom of the guiding inclined surface 125 can also be understood as the lowest point M at the bottom of the air release section 124. The highest point N at the bottom of the air release section 124 can be understood as the height of the bottom of the transition surface 126, or can also be understood as the highest point at the bottom of the guiding inclined surface 125.

[0066] In some possible embodiments provided by the present utility model, the length of one air release section 124 is less than one-fifth of the length of the second side wall 122. Thus, by reasonably setting the length of one air release section 124, for the entire release film, the areas of the release film in contact with the screen and the release film separated from the screen are relatively reasonable. On the basis of ensuring that the air release space formed between the release film separated from the screen and the screen can effectively reduce the vacuum adsorption force between the release film and the screen, improve the printing speed of the model and the success rate of the model, the problem that the unreasonable areas of the release film in contact with the screen and the release film separated from the screen affect the service life of the release film is avoided. Furthermore, the service life of the release film is improved, and the overall reliability of the material tank is improved.

[0067] Specifically, the length of one air release section 124 can be one-sixth, one-seventh, one-eighth, one-ninth, or other sizes of the length of the second side wall 122.

[0068] Such as Figure 3As shown, in some possible embodiments provided by the present utility model, the height difference between the transition surface 126 and the contact section 123 is 0.2 mm to 2 mm, which can also be understood as the height difference at the bottom of the air release section 124 being 0.2 mm to 2 mm, that is, the height difference in the vertical direction at the bottom of the air release section 124 is 0.2 mm to 2 mm. Specifically, the height difference between the bottom of the transition surface 126 and the bottom of the contact section 123 can be as shown by H in Figure 3 , and it can also be understood that the height difference between the highest point and the lowest point at the bottom of the second side wall 122 is 0.2 mm to 2 mm.

[0069] In this embodiment, by reasonably setting the height difference between the transition surface 126 and the contact section 123, that is, reasonably setting the height difference at the bottom of the air release section 124, thereby, it can be ensured that under the action of an external force, such as under the action of the resin gravity and the lower pressure of the forming platform, the release film covering the contact section 123 can be reliably in contact with the screen, and there can be a certain distance between the release film covering the transition section and the screen to smoothly form an air release space, and this air release space has a sufficient volume to ensure that the vacuum adsorption force between the release film and the screen can be effectively reduced, so as to improve the printing speed of the model and the success rate of the model, and is beneficial to extending the service life of the release film. At the same time, it can avoid the problem that the large height difference at both ends of the bottom of the air release section 124 affects the service life of the release film, which is beneficial to extending the service life of the release film.

[0070] Specifically, the height difference H between the transition surface 126 and the contact section 123 can be 0.2 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 2 mm, or other dimensions.

[0071] Such as Figure 2 and Figure 3 shown, in some possible embodiments provided by the present utility model, if both ends of the second side wall 122 respectively include an air release section 124, the heights of the highest points at the bottoms of the two air release sections 124 are equal or not equal, and the heights of the lowest points at the bottoms of the two air release sections 124 are equal to the height of the contact section 123. Among them, the highest point at the bottom of the air release section 124 can be understood as the height at the bottom of the transition surface 126 on the air release section 124, such as the point N shown in Figure 3 , and the lowest point at the bottom of the air release section 124 can be understood as the position where the air release section 124 is connected to the contact section 123, that is, the lowest point at the bottom of the guiding inclined surface 125, such as the point M shown in Figure 3 .

[0072] That is to say, when two air release sections 124 are provided on the second side wall 122, the lowest points at the bottoms of the two air release sections 124 have the same height, and they are arranged flush with each other, and they are arranged flush with the contact section 123. The highest points at the bottoms of the two air release sections 124 may or may not have the same height, and the two air release sections 124 may have the same structure or different structures.

[0073] Among them, the highest points at the bottoms of the two air release sections 124 have the same height, which is convenient for processing, and can improve the uniformity of the vacuum adsorption force of the release film in contact with the screen, so as to further improve the printing speed of the model and the success rate of the model, reduce problems such as cracking, detachment from the printing platform, and faults of the model, and is beneficial to improving the service life of the release film, thereby improving the service life of the material tank and the overall reliability of the three-dimensional forming equipment, and is suitable for popularization and application.

[0074] As Figure 3 shown, in some possible embodiments provided by the present invention, the lowest point at the bottom of the annular frame 120 does not protrude beyond the lowest point at the bottom of the annular wall 140.

[0075] That is to say, in the vertical direction, the lowest point at the bottom of the annular frame 120 is not higher than the lowest point at the bottom of the annular wall 140. Among them, the lowest point at the bottom of the annular frame 120 may be arranged flush with the lowest point at the bottom of the annular wall 140, or the lowest point at the bottom of the annular frame 120 may be located above the lowest point at the bottom of the annular wall 140.

[0076] Since the annular wall 140 is located on the side of the installation groove 130 away from the light-transmitting area 110, and the material tank needs to be placed above the screen of the base, therefore, the lowest point at the bottom of the annular frame 120 is set not to protrude beyond the lowest point at the bottom of the annular wall 140, so as to ensure that in the vertical direction, the lowest point at the bottom of the annular frame 120 is located above or flush with the lowest point at the bottom of the annular wall 140, so that the bottom of the annular wall 140 can contact the base or the screen to support the material tank frame 100 on the base, and then install the entire material tank on the base, avoiding the problem that the lowest point at the bottom of the annular frame 120 is located below the lowest point at the bottom of the annular wall 140, resulting in part of the release film contacting the screen, and there is a gap between the annular wall 140 and the base, causing the material tank frame 100 to be unable to be fixed on the base.

[0077] At the same time, this setting makes it so that when the release film at the lowest point of the bottom of the annular frame 120 contacts the screen to generate a vacuum phenomenon, the release film at the air release section 124 does not contact the screen, so that there is a venting space between the release film at the air release section 124 and the screen, so as to reduce the vacuum adsorption force between the release film and the screen, so as to improve the printing speed of the model and the success rate of the model, and is beneficial to extending the service life of the release film.

[0078] AsFigure 2 and Figure 3 As shown in Figure 3 , in the above embodiment, the bottom of the annular wall 140 is horizontally arranged. Since usually the surface of the base or the screen in contact with the material tank is set as a plane, by horizontally arranging the bottom of the annular wall 140, it is beneficial to increase the contact area between the annular wall 140 and the base or the screen, thereby improving the reliability and stability of the connection between the material tank frame 100 and the base or the screen, and improving the reliability and stability of the connection between the material tank and the base or the material tank and the screen.

[0079] It can be understood that in other examples, the shape of the bottom of the annular wall 140 can also match the shape of the part of the base in contact therewith and the shape of the part of the screen in contact therewith. For example, the bottom of the annular wall 140 can also be arranged obliquely, etc.

[0080] An embodiment of the second aspect of the present utility model provides a three-dimensional forming device, including: a base, a screen installed on the base, and the material tank of any one of the foregoing embodiments. The material tank is arranged on the base and above the screen, and at least part of the release film is in contact with the screen. It can be understood that at least part of the release film being in contact with the screen can mean that the release film is in contact with the screen only under the action of gravity, or that the release film is in contact with the screen under the action of the resin in the material tank.

[0081] Since the three-dimensional forming device includes the material tank of any one of the foregoing embodiments, it has all the technical effects of the foregoing material tank, and will not be elaborated herein one by one.

[0082] Wherein, the screen can be fixed on the base by at least one of a threaded structure, a clamping structure, a plugging structure, a mortise and tenon structure, an adhesive, and hot melting.

[0083] Wherein, a limiting structure can be arranged on the base, and the material tank can be restricted on the base by the limiting structure. The limiting structure can be a protrusion, a groove, etc.

[0084] Specifically, as Figures 1 to 4 shown, the present utility model also provides the following embodiments:

[0085] Reference numeral 1, a material tank, which is applied to a three-dimensional forming device. The material tank includes a material tank frame 100 and a release film. The material tank frame 100 includes a light-transmitting area 110. The bottom of the material tank frame 100 is provided with an annular frame 120. The annular frame 120 surrounds and forms the light-transmitting area 110. The release film is used to be connected with the material tank frame 100 and cover the annular frame 120 and the light-transmitting area 110. The height of at least one side of the bottom of the annular frame 120 is higher than the height of the middle part of the bottom of the annular frame 120.

[0086] Reference numeral 2. For the feeding trough according to reference numeral 1, an annular mounting groove 130 and an annular wall 140 are further provided on the feeding trough frame 100. The annular frame 120 is the side close to the center of the feeding trough frame 100 that encloses to form the mounting groove 130; the annular wall 140 is the side far from the center of the feeding trough frame 100 that encloses to form the mounting groove 130; the release film is connected to the feeding trough frame 100 through the mounting groove 130.

[0087] Reference numeral 3. For the feeding trough according to reference numeral 1, the annular frame 120 includes two opposite first side walls 121 and two opposite second side walls 122. The two ends of the first side wall 121 are respectively connected to a second side wall 122, and the two ends of the second side wall 122 are respectively connected to a first side wall 121; the height of at least the bottom of one first side wall 121 is higher than the height of at least part of the bottom of the second side wall 122.

[0088] Reference numeral 4. For the feeding trough according to reference numeral 3, the second side wall 122 includes a contact section 123 and a deflation section 124 located at at least one end of the second side wall 122. At least part of the height of the bottom of the deflation section 124 is higher than the bottom of the contact section 123.

[0089] Reference numeral 5. For the feeding trough according to reference numeral 4, if one end of the second side wall 122 includes a deflation section 124, the deflation sections 124 of the two second side walls 122 are arranged oppositely.

[0090] Reference numeral 6. For the feeding trough according to reference numeral 4, the deflation section 124 includes a guiding inclined surface 125 and a transition surface 126. The contact section 123 is connected to the transition surface 126 through the guiding inclined surface 125, and the height of the bottom of the transition surface 126 is higher than the bottom of the contact section 123.

[0091] Reference numeral 7. For the feeding trough according to reference numeral 6, the bottom of the guiding inclined surface 125 gradually rises from the end close to the contact section 123 to the end far from the contact section 123.

[0092] Reference numeral 8. For the feeding trough according to reference numeral 6, the transition surface 126 is connected to the first side wall 121, and the height of the bottom of the transition surface 126 is equal to the height of the bottom of the first side wall 121 connected to the transition surface 126.

[0093] Reference numeral 9. For the feeding trough according to reference numeral 6, the length of one deflation section 124 is less than one-fifth of the length of the second side wall 122; or the height difference between the transition surface 126 and the contact section 123 is 0.2 mm to 2 mm.

[0094] Reference numeral 10. For the feeding trough according to reference numeral 6, if the two ends of the second side wall 122 respectively include deflation sections 124, the heights of the highest points of the bottoms of the two deflation sections 124 are equal or not equal, and the heights of the lowest points of the bottoms of the two deflation sections 124 are equal to the height of the bottom of the contact section 123.

[0095] Reference numeral 11. For the feeding trough according to reference numeral 2, the lowest point at the bottom of the annular frame 120 is not lower than the lowest point at the bottom of the annular wall 140; and / or the bottom of the annular wall 140 is horizontally arranged.

[0096] Specifically, the present utility model further provides the following embodiments:

[0097] Reference numeral 11. A three-dimensional forming device, comprising: a base, and a feeding trough as in reference numeral 10, the feeding trough being arranged on the base.

[0098] In the description of the present utility model, the term "a plurality of" refers to two or more, unless otherwise clearly defined. The orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present utility model; the terms "connection", "installation", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0099] For those skilled in the art, the present utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A material trough, applied to a three-dimensional forming device, characterized in that the material trough includes a material trough frame and a release film. The material trough frame includes a light-transmitting area. An annular frame is provided at the bottom of the material trough frame, and the annular frame encloses to form the light-transmitting area. The release film is used to be connected with the material trough frame and cover the annular frame and the light-transmitting area. The height of at least one side of the bottom of the annular frame is higher than the height of the middle part of the bottom of the annular frame.

2. The trough according to claim 1, characterized in that, An annular installation groove and an annular wall are further provided on the material trough frame. The annular frame is the side close to the center of the material trough frame that encloses to form the installation groove; the annular wall is the side far from the center of the material trough frame that encloses to form the installation groove; the release film is connected with the material trough frame through the installation groove.

3. The trough according to claim 1, characterized in that, The annular frame includes two opposite first side walls and two opposite second side walls. The two ends of the first side wall are respectively connected to one of the second side walls, and the two ends of the second side wall are respectively connected to one of the first side walls; the height of at least one bottom of the first side wall is higher than the height of at least part of the bottom of the second side wall.

4. The trough according to claim 3, characterized in that, The second side wall includes a contact section and a deflation section located at at least one end of the second side wall. The height of at least part of the bottom of the deflation section is higher than the bottom of the contact section.

5. The trough according to claim 4, characterized in that, If one end of the second side wall includes the deflation section, the deflation sections of the two second side walls are arranged oppositely.

6. The trough according to claim 4, wherein The deflation section includes a guiding inclined surface and a transition surface. The contact section is connected to the transition surface through the guiding inclined surface, and the height of the bottom of the transition surface is higher than the height of the bottom of the contact section.

7. The trough according to claim 6, characterized in that, The bottom of the guiding inclined surface gradually rises from the end close to the contact section to the end far from the contact section.

8. The trough according to claim 6, characterized in that, The transition surface is connected to the first side wall, and the height of the bottom of the transition surface is equal to the height of the bottom of the first side wall connected to the transition surface.

9. The trough according to claim 6, wherein The length of one deflation section is less than one-fifth of the length of the second side wall; or the height difference between the transition surface and the contact section is 0.2 mm to 2 mm.

10. The trough according to claim 6, characterized in that, If the two ends of the second side wall respectively include the deflation section, the heights of the highest points of the bottoms of the two deflation sections are equal or not equal, and the heights of the lowest points of the bottoms of the two deflation sections are equal to the height of the bottom of the contact section.

11. The trough according to claim 2, characterized in that, The lowest point of the bottom of the annular frame is not lower than the lowest point of the bottom of the annular wall; and / or the bottom of the annular wall is horizontally arranged.

12. A three-dimensional forming device, characterized in that, It includes: a base, and the material trough according to any one of claims 1 to 11, and the material trough is arranged on the base.

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