Powder spreading device and 3D printing equipment

Abstract

The utility model discloses a powder laying device and 3D printing equipment, the powder laying device comprises a support, a pre-laying assembly and a powder laying assembly, the pre-laying assembly comprises a first mounting part and a pre-laying cutter, the first mounting part is movably connected to the support, the pre-laying cutter is switched between a first state and a second state, and the first mounting part is connected to the support. The powder spreading assembly comprises a second mounting part and a powder spreading tool, the second mounting part is movably connected to the support, and the powder spreading tool is switched between a third state and a fourth state; the 3D printing equipment comprises the powder spreading device. According to the powder spreading device, the pre-spreading cutter and the powder spreading cutter both have the working states of executing the powder spreading action and being far away from the powder spreading platform, one of the pre-spreading cutter and the powder spreading cutter can be selected for spreading powder or the pre-spreading cutter and the powder spreading cutter can be selected for spreading powder at the same time according to the current powder type needing powder spreading, and the powder spreading device can be suitable for spreading powder of various types. And the density of the powder bed after different types of powder are laid is improved, and then the printing quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printing, in particular to a powder spreading device and a 3D printing device. Background Art

[0002] In traditional SLS (Selective Laser Sintering) / PBF-LB (Powder Bed Fusion by Laser) additive manufacturing technologies, the printing powders commonly used are mostly near-spherical or spherical powders. After the powders are spread on the printing platform by a powder spreading device and then formed, good sphericity of the powders is the prerequisite for improving the density of the powder bed in the forming cavity. However, in recent years, the research on composite powders in the SLS / PBF-LB field has been continuously developing, which has led to problems such as poor sphericity of the powders used in printing or even multi-angular powders prepared for the composite powders. The powder spreading devices in the related technologies can only spread a single type of powder. When spreading different types of powders, the density of the powder bed is unstable, affecting the printing quality. Summary of the Invention

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides a powder spreading device, which can improve the density of the powder bed after spreading different types of powders, and further improve the printing quality.

[0004] The utility model also provides a 3D printing device with the above powder spreading device.

[0005] The powder spreading device according to the first aspect embodiment of the utility model is used to spread the powders on a powder spreading platform along a first direction. The powder spreading device includes:

[0006] A bracket;

[0007] A pre-spreading assembly, including a first mounting member and at least one pre-spreading cutter. The pre-spreading cutter is connected to the first mounting member. The pre-spreading cutter has a first state for powder spreading and a second state away from the powder spreading platform. The first mounting member is movably connected to the bracket so that the pre-spreading cutter can switch between the first state and the second state;

[0008] A powder spreading assembly. The pre-spreading assembly is located in front of the powder spreading assembly in the first direction. The powder spreading assembly includes a second mounting member and at least one powder spreading cutter. The powder spreading cutter is connected to the second mounting member. The powder spreading cutter has a third state for powder spreading and a fourth state away from the powder spreading platform. The second mounting member is movably connected to the bracket so that the powder spreading cutter can switch between the third state and the fourth state.

[0009] The powder spreading device according to the embodiment of the utility model has at least the following beneficial effects:

[0010] In the present utility model, both the pre - spreading tool and the powder - spreading tool have working states of performing powder - spreading actions and moving away from the powder - spreading platform. According to the type of powder to be spread currently, one of the pre - spreading tool and the powder - spreading tool can be selected for powder - spreading, or both can perform powder - spreading simultaneously. The powder - spreading device can be applicable to powder - spreading of various types of powders, improve the density of the powder bed after powder - spreading of different types of powders, and thus enhance the printing quality.

[0011] According to some embodiments of the present utility model, the first mounting member is detachably connected to the bracket;

[0012] And / or, the second mounting member is detachably connected to the bracket.

[0013] According to some embodiments of the present utility model, the first mounting member is slidably connected to the bracket in the vertical direction and can drive the pre - spreading tool to move up and down;

[0014] And / or, the second mounting member is slidably connected to the bracket in the vertical direction and can drive the powder - spreading tool to move up and down.

[0015] According to some embodiments of the present utility model, one of the first mounting member and the bracket is provided with a first mounting hole extending in the vertical direction, and the other is provided with a second mounting hole. The pre - spreading assembly further includes a first locking member, and the first locking member passes through the first mounting hole and the second mounting hole to lock the first mounting member to the bracket or release the locking of the first mounting member, so that the first mounting member can move up and down relative to the bracket;

[0016] And / or, one of the second mounting member and the bracket is provided with a third mounting hole extending in the vertical direction, and the other is provided with a fourth mounting hole. The pre - spreading assembly further includes a second locking member, and the second locking member passes through the third mounting hole and the fourth mounting hole to lock the second mounting member to the bracket or release the locking of the second mounting member, so that the second mounting member can move up and down relative to the bracket.

[0017] According to some embodiments of the present utility model, the bracket includes a cross - beam and two oppositely arranged frame bodies. The two ends of the cross - beam are respectively connected to the two frame bodies. The powder - spreading assembly is installed below the cross - beam and located between the two frame bodies. The cross - beam has a mounting groove, and the second mounting member is vertically inserted into the mounting groove, and the end of the second mounting member in the second direction abuts against the groove wall of the mounting groove. The second direction, the second direction and the vertical direction are perpendicular to each other in pairs.

[0018] According to some embodiments of the present utility model, the powder spreading device further includes an elastic pad. The elastic pad extends along the second direction and is received in the installation groove. The top of the elastic pad abuts against the groove wall of the installation groove, and the bottom of the elastic pad abuts against the second mounting member.

[0019] According to some embodiments of the present utility model, a plurality of powder spreading assemblies are arranged along the first direction;

[0020] and / or, the powder spreading assembly includes a plurality of powder spreading cutters arranged along the first direction.

[0021] According to some embodiments of the present utility model, the pre-powder spreading cutter has a powder spreading surface for spreading powder, and the powder spreading surface is a flat surface, an inclined surface or a curved surface; alternatively, the pre-powder spreading cutter is rotatably connected to the first mounting member, and the pre-powder spreading cutter is arranged as a cylindrical roller;

[0022] and / or,

[0023] the powder spreading cutter has a powder spreading surface for spreading powder, and the powder spreading surface is a flat surface, an inclined surface or a curved surface; alternatively, the powder spreading cutter is rotatably connected to the second mounting member, and the powder spreading cutter is arranged as a cylindrical roller.

[0024] According to some embodiments of the present utility model, the pre-powder spreading cutter is rotatably connected to the first mounting member, and the pre-powder spreading cutter is arranged as a cylindrical roller. The powder spreading device further includes a first driving assembly, the first driving assembly is detachably connected to the bracket, the first driving assembly is in transmission connection with the pre-powder spreading cutter, and is used for driving the pre-powder spreading cutter to rotate;

[0025] the powder spreading cutter is rotatably connected to the second mounting member, the powder spreading cutter is arranged as a cylindrical roller, the powder spreading device further includes a second driving assembly, the second driving assembly is detachably connected to the bracket, the second driving assembly is in transmission connection with the powder spreading cutter, and is used for driving the powder spreading cutter to rotate.

[0026] A 3D printing device according to an embodiment of the second aspect of the present utility model includes:

[0027] the powder spreading device of the first aspect embodiment;

[0028] a powder spreading platform for accommodating powder, and the powder spreading device moves relative to the powder spreading platform along the first direction to spread powder on the powder on the powder spreading platform.

[0029] The additional aspects and advantages of the present utility model will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present utility model. Description of the Drawings

[0030] The following further describes the present utility model in conjunction with the accompanying drawings and embodiments, where:

[0031] Figure 1 It is a schematic diagram of an embodiment of the powder spreading device of the present utility model;

[0032] Figure 2 is Figure 1 a schematic diagram of another direction in

[0033] Figure 3 It is a schematic diagram of the cooperation between the powder spreading device and the powder spreading platform;

[0034] Figure 4 It is a schematic diagram of an embodiment of the pre - powder spreading tool and the first mounting member;

[0035] Figure 5 It is a schematic diagram of another embodiment of the pre - powder spreading tool and the first mounting member;

[0036] Figure 6 It is a schematic diagram of an embodiment of the bracket;

[0037] Figure 7 It is a schematic diagram of an embodiment of the powder spreading assembly;

[0038] Figure 8 It is a schematic diagram of an embodiment of the powder spreading assembly.

[0039] Reference numerals:

[0040] Powder spreading device 100, bracket 110, second mounting hole 111, third mounting hole 112, cross beam 113, mounting groove 1131, frame body 114, sliding part 115, pre - powder spreading assembly 120, first mounting member 121, first mounting hole 1211, pre - powder spreading tool 122, powder spreading surface 1221, powder spreading assembly 130, second mounting member 131, fourth mounting hole 1311, top cover 1312, end cover 1313, powder spreading tool 132, elastic pad 140, first driving assembly 150, first mounting seat 151, first driving element 152, second driving assembly 160, second mounting seat 161, second driving element 162; powder spreading platform 200. Detailed implementation manners

[0041] The following details the embodiments of the present utility model. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0042] In the description of the present utility model, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc., it is based on the orientation or positional relationship shown in the drawings. It 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. Therefore, it should not be construed as a limitation to the present utility model.

[0043] In the description of the present utility model, the meaning of several is more than one, and the meaning of multiple is more than two. Understandings such as greater than, less than, exceeding, etc. do not include the present number, and understandings such as above, below, within, etc. include the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0044] In the description of the present utility model, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present utility model in combination with the specific content of the technical solution.

[0045] In the description of the present utility model, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0046] The morphologies, flow properties, agglomeration properties, and densities of different types of printing powders are different. In the related art, the powder spreading device can only spread powder for a single type of powder. When spreading powder for different types of powders, there are situations where the density and uniformity of the powder bed are unstable, and it cannot meet the powder spreading requirements of multiple types of powders. For example, powders with good sphericity have good fluidity, and a powder bed with high density and surface quality can be obtained by using a doctor blade for powder spreading. However, the sphericity of composite powders is poor, and most of them are multi-angular powders. If a doctor blade is still used for powder spreading, voids are likely to appear in the powder bed, and the density and surface quality are poor. Similarly, when spreading powders with different flow properties, agglomeration properties, or densities, there are also situations where the quality of the powder bed is poor.

[0047] Based on the above, referring to Figures 1 to 3, the present utility model provides a powder spreading device 100. The powder spreading device 100 is used to spread powder on a powder spreading platform 200 in a first direction. For example, the powder spreading device 100 moves relative to the powder spreading platform 200 in the first direction and completes the powder spreading action on the powder on the powder spreading platform 200 during the movement. The powder spreading device 100 includes a bracket 110, a pre-spreading assembly 120 and a powder spreading assembly 130. The pre-spreading assembly 120 and the powder spreading assembly 130 are both installed on the bracket 110. The pre-spreading assembly 120 is located on the front side of the powder spreading assembly 130 in the first direction. For the case where both the pre-spreading assembly 120 and the powder spreading assembly 130 participate in powder spreading, during powder spreading, the pre-spreading assembly 120 can contact the powder before the powder spreading assembly 130, and the two cooperate to spread the powder.

[0048] The pre-spreading assembly 120 includes a first mounting member 121 and at least one pre-spreading tool 122. The pre-spreading tool 122 is connected to the first mounting member 121. The pre-spreading tool 122 has a first state for powder spreading and a second state away from the powder spreading platform 200. The first mounting member 121 is movably installed on the bracket 110. When the first mounting member 121 moves relative to the bracket 110, it synchronously drives the pre-spreading tool 122 to move, so that the pre-spreading tool 122 switches between the first state and the second state. Exemplarily, the first mounting member 121 can move relative to the bracket 110. When the first mounting member 121 gradually approaches the powder spreading platform 200 by moving, the pre-spreading tool 122 gradually switches to the first state. When the pre-spreading tool 122 contacts the powder, the pre-spreading tool 122 switches to the first state and can perform the powder spreading action. Similarly, when the first mounting member 121 moves away from the powder spreading platform 200, the pre-spreading tool 122 disengages from the powder and moves away from the powder spreading platform 200. At this time, the pre-spreading tool 122 switches to the second state. Or, the first mounting member 121 can be removed from the bracket 110. After the first mounting member 121 is removed from the bracket 110, the pre-spreading tool 122 moves away from the powder spreading platform 200. At this time, the pre-spreading tool 122 is in the second state. After the first mounting member 121 is installed on the bracket 110, the pre-spreading tool 122 can contact the powder on the powder spreading platform 200. At this time, the pre-spreading tool 122 is in the first state. That is, by the movement of the first mounting member 121 relative to the bracket 110, the pre-spreading tool 122 can perform the powder spreading action or move away from the powder spreading platform 200.

[0049] The powder spreading assembly 130 includes a second mounting member 131 and at least one powder spreading tool 132. The powder spreading tool 132 is connected to the second mounting member 131. The powder spreading tool 132 has a third state for powder spreading and a fourth state away from the powder spreading platform 200. The second mounting member 131 is movably mounted on the bracket 110. When the second mounting member 131 moves relative to the bracket 110, the pre-powder spreading tool 122 is synchronously driven to move, so that the pre-powder spreading tool 122 switches between the third state and the fourth state. Exemplarily, the second mounting member 131 can move relative to the bracket 110. When the second mounting member 131 gradually approaches the powder spreading platform 200 by moving, the powder spreading tool 132 gradually switches to the third state. When the powder spreading tool 132 contacts the powder, the powder spreading tool 132 switches to the third state and can perform the powder spreading action. Similarly, when the second mounting member 131 moves away from the powder spreading platform 200 by moving, the powder spreading tool 132 disengages from the powder and moves away from the powder spreading platform 200. At this time, the powder spreading tool 132 switches to the fourth state. Alternatively, the second mounting member 131 can be removed from the bracket 110. After the second mounting member 131 is removed from the bracket 110, the powder spreading tool 132 moves away from the powder spreading platform 200. At this time, the powder spreading tool 132 is in the fourth state. After the second mounting member 131 is mounted on the bracket 110, the powder spreading tool 132 can contact the powder on the powder spreading platform 200. At this time, the powder spreading tool 132 is in the third state. That is, by the movement of the second mounting member 131 relative to the bracket 110, the powder spreading tool 132 can perform the powder spreading action or move away from the powder spreading platform 200.

[0050] Therefore, in the present utility model, both the pre-powder spreading tool 122 and the powder spreading tool 132 have working states of performing the powder spreading action and moving away from the powder spreading platform 200. According to the type of powder to be spread currently, one of the pre-powder spreading tool 122 and the powder spreading tool 132 can be selected for powder spreading or both can perform powder spreading simultaneously. The powder spreading device 100 can be applicable to the powder spreading of various types of powders, improve the density of the powder bed after the powder spreading of different types of powders, and further improve the printing quality.

[0051] Exemplarily, for powders that are prone to agglomeration, have a large density, and a small powder diameter, a powder spreading method with pre-spreading is adopted. That is, while the pre-spreading tool 122 enters the first state, the powder spreading tool 132 enters the third state. The pre-spreading tool 122 and the powder spreading tool 132 are combined for powder spreading. The pre-spreading tool 122 first contacts the powder, playing a role in pre-dispersing the powder. Then, the powder spreading tool 132 spreads the dispersed powder, reducing the influence of powder agglomeration and caking on powder spreading and improving the quality of the powder bed. For powders with general powder fluidity and a moderate powder diameter, a powder spreading method without pre-spreading is adopted. The pre-spreading tool 122 is always in the second state. After the powder spreading tool 132 enters the third state, it directly spreads the powder. The powder can form a good powder bed under the action of the powder spreading tool 132. For powders with good powder fluidity and a moderate powder diameter, a powder spreading method with only pre-spreading is adopted. The powder spreading tool 132 is always in the fourth state. After the pre-spreading tool 122 enters the first state, it directly spreads the powder. The powder can form a good powder bed under the action of the pre-spreading tool 122.

[0052] The types and shapes of the pre-spreading tool 122 and the powder spreading tool 132 are set to be the same or different. In one embodiment, as Figure 4 shown, the pre-spreading tool 122 is set as a scraper. The pre-spreading tool 122 has a powder spreading surface 1221 for powder spreading. The powder spreading surface 1221 is defined as the surface that contacts the powder during the powder spreading process of the pre-spreading tool 122. For example, the powder spreading surface 1221 is located at one end of the pre-spreading tool 122 facing the powder spreading platform 200. The surface of the pre-spreading tool 122 at one end facing the powder spreading platform 200 and a part of the surface of the pre-spreading tool 122 facing the first direction form the powder spreading surface 1221. The powder spreading surface 1221 is set as a plane, an inclined plane, or an arc surface. The pre-spreading tool 122 with an arc-shaped powder spreading surface 1221 can make more powder enter the tool gap, reducing the possibility of forming a force arch during powder spreading, and thus improving the density and uniformity of the powder layer. The powder spreading tool 132 with a plane or inclined plane can optimize the surface roughness of the powder bed, making the powder bed have better surface quality. In another embodiment, referring to Figure 5 , the pre-spreading tool 122 is rotatably connected to the first mounting member 121. The pre-spreading tool 122 is set as a cylindrical roller. The pre-spreading tool 122 can rotate relative to the first mounting member 121 while following the first mounting member 121 to move in the first direction and spread the powder during rotation. The circumferential surface of the cylindrical roller contacts the powder, rolling and pushing the powder to improve the density of the powder bed.

[0053] Understandably, in one embodiment, the powder spreading tool 132 can also be set as a doctor blade. The powder spreading surface 1221 of the powder spreading tool 132 is set as a flat surface, an inclined surface or a curved surface, and can produce the same effect as the powder spreading surface 1221 of the pre-powder spreading tool 122. In other embodiments, the powder spreading tool 132 is rotatably connected to the second mounting member 131. The powder spreading tool 132 is set as a cylindrical roller. The powder spreading tool 132 rotates relative to the second mounting member 131 while following the second mounting member 131 to move in the first direction, and spreads powder during the rotation process, which can produce the same effect as when the pre-powder spreading tool 122 is set as a cylindrical roller.

[0054] When the powder spreading tool 132 and the pre-powder spreading tool 122 cooperate to spread powder, for powders with poor fluidity and easy to agglomerate, both the pre-powder spreading tool 122 and the powder spreading tool 132 are set as cylindrical rollers. That is, first, the pre-powder spreading tool 122 is used for pre-powder spreading. The cylindrical roller of the pre-powder spreading tool 122 can break up the powder and push the powder to move during the powder spreading process. Then, the powder spreading tool 132 spreads the further broken-up powder, compacts and levels the powder, and improves the density and uniformity of the powder bed. For powders with general fluidity and easy to agglomerate, in one embodiment, the pre-powder spreading tool 122 is set as a cylindrical roller, and the powder spreading tool 132 is set as a doctor blade. That is, first, the pre-powder spreading tool 122 fully disperses the powder, and then the powder spreading tool 132 is used to further level the surface of the powder, so that the powder bed has a high surface quality. Or, in another embodiment, the pre-powder spreading tool 122 is set as a doctor blade, and the powder spreading tool 132 is set as a cylindrical roller. That is, first, the pre-powder spreading tool 122 breaks up the powder, and then the powder spreading tool 132 is used for further rolling to improve the density of the powder bed and the quality of the powder bed.

[0055] It should be noted that the powder spreading tool 132 and the pre-spreading tool 122 can be set according to the type of powder to be spread currently, so that the powder spreading device 100 can adapt to the powder spreading requirements of different types of powders. For example, the pre-spreading tool 122 is removed or moved away from the powder spreading platform 200, and the pre-spreading tool 122 is maintained in the second state, and only the powder spreading tool 132 is used for powder spreading. At this time, the powder spreading device 100 spreads powder in a non-pre-spreading manner. Or, the powder spreading tool 132 is removed or moved away from the powder spreading platform, and the powder spreading tool 132 is maintained in the fourth state, and only the pre-spreading tool 122 is used for powder spreading. At this time, the powder spreading tool 132 spreads powder in a pre-spreading only manner. Or, the first mounting member 121 is removed and replaced with a pre-spreading assembly 120 having a pre-spreading tool 122 of another type (a scraper or a cylindrical roller with a different shape). Or, the second mounting member 131 is removed and replaced with a powder spreading assembly 130 having a powder spreading tool 132 of another type (a scraper or a cylindrical roller with a different shape). Or, the first mounting member 121 is removed and replaced with a pre-spreading assembly 120 having a greater number of pre-spreading tools 122. Or, the second mounting member 131 is removed and replaced with a powder spreading assembly 130 having a greater number of powder spreading tools 132. It can be understood that according to the specific type of powder, the above-mentioned changes in the type and quantity of the tools and the change in the presence or absence of pre-spreading can be combined with each other. For example, while removing the pre-spreading assembly 120, the powder spreading assembly 130 with a powder spreading tool 132 of a different quantity or type is replaced.

[0056] In addition, a plurality of powder spreading assemblies 130 can be arranged in the first direction, and / or the powder spreading assembly 130 includes a plurality of powder spreading tools 132 arranged in the first direction. The powder passes through the powder spreading actions of the plurality of powder spreading tools 132 in sequence, which can further improve the quality of the powder bed. It can be understood that for the case where a plurality of powder spreading assemblies 130 are provided, powder spreading tools 132 of different shapes or types can be provided in different powder spreading assemblies 130. Different powder spreading assemblies 130 can selectively switch the states of the powder spreading tools 132, and can selectively make one or several of the powder spreading assemblies 130 perform the powder spreading action. For the case where the powder spreading assembly 130 includes a plurality of powder spreading tools 132, the powder spreading tools 132 are set to different shapes or types, and the plurality of powder spreading tools 132 are used in cooperation to improve the surface quality and density of the powder bed. Exemplarily, the powder spreading assembly 130 includes a plurality of scrapers arranged side by side, or a plurality of cylindrical rollers arranged side by side.

[0057] The ways in which the first mounting member 121 is movable relative to the bracket 110 are not limited to movement, rotation, removal, etc. Specifically, in one embodiment, the first mounting member 121 is detachably connected to the bracket 110, and the detachable connection method is not limited to threaded connection, snap connection, etc. When the first mounting member 121 is mounted on the bracket 110, the powder pre-spreading tool 122 is in the first state. After the first mounting member 121 is removed from the bracket 110, the powder pre-spreading tool 122 is in the second state. Similarly, the second mounting member 131 is detachably connected to the bracket 110. When the second mounting member 131 is mounted on the bracket 110, the powder spreading tool 132 is in the third state. After the second mounting member 131 is removed from the bracket 110, the powder spreading tool 132 is in the fourth state.

[0058] In another embodiment, both ends of the first mounting member 121 in the length direction are rotatably connected to the bracket 110. The powder pre-spreading tool 122 is connected to one side of the first mounting member 121 facing the powder spreading platform 200. When the first mounting member 121 is driven to rotate relative to the bracket 110, the powder pre-spreading tool 122 approaches or moves away from the powder spreading platform 200 and switches between the first state and the second state. Similarly, both ends of the second mounting member 131 in the length direction are rotatably connected to the bracket 110. The powder spreading tool 132 is connected to one side of the second mounting member 131 facing the powder spreading platform 200. When the second mounting member 131 is driven to rotate relative to the bracket 110, the powder spreading tool 132 approaches or moves away from the powder spreading platform 200 and switches between the third state and the fourth state.

[0059] Alternatively, in another embodiment, the first mounting member 121 is slidably connected to the bracket 110 in the vertical direction and can drive the powder pre-spreading tool 122 to move up and down, so that the first mounting member 121 is driven to approach or move away from the powder spreading platform 200 and switches between the first state and the second state. Similarly, the second mounting member 131 is slidably connected to the bracket 110 in the vertical direction and can drive the powder spreading tool 132 to move up and down, so that the second mounting member 131 is driven to approach or move away from the powder spreading platform 200 and switches between the third state and the fourth state. It can be understood that the powder is usually placed on the top of the powder spreading platform 200, and the powder spreading device 100 is located above the powder spreading platform 200. By moving the first mounting member 121 or the second mounting member 131 up and down, the state switching of the powder pre-spreading tool 122 or the powder spreading tool 132 can be realized.

[0060] Specifically, in one embodiment, refer to Figures 4 to 6, one of the first mounting member 121 and the bracket 110 is provided with a first mounting hole 1211 extending vertically, and the other is provided with a second mounting hole 111. The pre-laying assembly 120 further includes a first locking member. The first locking member passes through the first mounting hole 1211 and the second mounting hole 111 to lock the first mounting member 121 to the bracket 110. At this time, the first mounting member 121 is stably mounted on the bracket 110, or the locking of the first mounting member 121 is released to enable the first mounting member 121 to move up and down relative to the bracket 110. At this time, the first mounting member 121 drives the pre-laying tool 122 to approach or move away from the powder spreading platform 200, so that the pre-laying tool 122 switches between the first state and the second state. It should be noted that by locking and releasing the first mounting member 121 with the first locking member, the first mounting member 121 is fixed to the bracket 110 or moves relative to the bracket 110, so that the pre-laying tool 122 switches states; in addition, the first locking member can be set as a threaded fastener, and the first locking member can be removed from the first mounting hole 1211 and the second mounting hole 111, so that the first mounting member 121 can be removed from the bracket 110 and another pre-laying assembly 120 can be replaced, so that the pre-laying assembly 120 can not only switch states by moving relative to the bracket 110, but also switch states by being removed or fixed to the bracket 110.

[0061] Similarly, referring to Figure 6 With Figure 7 , one of the second mounting member 131 and the bracket 110 is provided with a third mounting hole 112 extending vertically, and the other is provided with a fourth mounting hole 1311. The pre-laying assembly 120 further includes a second locking member. The second locking member passes through the third mounting hole 112 and the fourth mounting hole 1311 to lock the second mounting member 131 to the bracket 110. At this time, the second mounting member 131 is stably mounted on the bracket 110, or the locking of the second mounting member 131 is released to enable the second mounting member 131 to move up and down relative to the bracket 110. At this time, the second mounting member 131 drives the pre-laying tool 122 to approach or move away from the powder spreading platform 200, so that the pre-laying tool 122 switches between the first state and the second state. It should be noted that by locking and releasing the second mounting member 131 with the second locking member, the second mounting member 131 is fixed to the bracket 110 or moves relative to the bracket 110, so that the pre-laying tool 122 switches states; in addition, the second locking member can be set as a threaded fastener, and the second locking member can be removed from the third mounting hole 112 and the fourth mounting hole 1311, so that the second mounting member 131 can be removed from the bracket 110 and another pre-laying assembly 120 can be replaced, so that the pre-laying assembly 120 can not only switch states by moving relative to the bracket 110, but also switch states by being removed or fixed to the bracket 110.

[0062] It should be noted that by adjusting the position of the first locking member to lock the first mounting member 121 in the first mounting hole 1211, the height of the pre-spreading tool can be changed. Similarly, by adjusting the position of the second locking member to lock the second mounting member 131 in the second mounting hole 111, the height of the powder spreading tool 132 can be changed. Further, by changing the height of the pre-spreading tool 122 and / or the powder spreading tool 132, the height difference between the pre-spreading tool 122 and the powder spreading tool 132 can be adjusted. For example, the lowest surface of the powder spreading tool 132 is set to be lower than the lowest surface of the pre-spreading tool 122 by a preset distance. By spreading powder through the cooperation of the powder spreading tool 132 and the pre-spreading tool 122, the powder bed has a higher density.

[0063] Referring to Figure 1 and Figure 8 , the support 110 includes a cross beam 113 and two oppositely arranged frame bodies 114. The two ends of the cross beam 113 are respectively connected to the two frame bodies 114, and the support 110 forms a structurally stable support system. The powder spreading assembly 130 is installed below the cross beam 113 and is located between the two frame bodies 114. The cross beam 113 has a mounting groove 1131. The second mounting member 131 is inserted vertically into the mounting groove 1131, and the end of the second mounting member 131 in the second direction abuts against the groove wall of the mounting groove 1131. The first direction, the second direction, and the vertical direction are perpendicular to each other in pairs. When the second mounting member 131 moves vertically, it is guided and limited by the groove wall of the mounting groove 1131, so that the second mounting member 131 maintains balance during the lifting process, and the powder spreading tool 132 has a high levelness, improving the uniformity of the powder bed.

[0064] Further, the powder spreading device 100 further includes an elastic pad 140. The elastic pad 140 has elasticity and the ability to compress and shrink and rebound by itself. The elastic pad 140 is made of materials such as rubber and foam. The elastic pad 140 extends in the second direction and is accommodated in the mounting groove 1131. The top of the elastic pad 140 abuts against the groove wall of the mounting groove 1131, and the bottom of the elastic pad 140 abuts against the second mounting member 131. During the lifting process of the second mounting member 131 in the mounting groove 1131, it receives the elastic force feedback of the elastic pad 140, which is convenient for adjusting the height of the second mounting member 131 and avoiding the collision between the second mounting member 131 and the cross beam 113. Since the elastic pad 140 is clamped between the second mounting member 131 and the cross beam 113, different parts of the second mounting member 131 in the second direction can be adjusted to the same height according to the elastic force feedback of the elastic pad 140, further improving the levelness of the powder spreading tool 132 and the quality of the powder bed.

[0065] Taking the powder spreading tool 132 being set as a cylindrical roller as an example, the second mounting member 131 includes a top cover 1312 and two oppositely arranged end covers 1313. The end covers 1313 are connected below the top cover 1312. The two end covers 1313 are arranged at intervals along the second direction. The two end covers 1313 and the top cover 1312 define an installation groove 1131. Both ends of the powder spreading tool 132 are rotatably connected to the two top covers 1312 respectively. The end covers 1313 and the top cover 1312 are detachably connected. By replacing the end covers 1313, the number of powder spreading tools 132 connected to the second mounting member 131 can be changed; that is, different end covers 1313 are pre-installed with different numbers of powder spreading tools 132 or different types of powder spreading tools 132. When the powder spreading tool 132 needs to be replaced, the corresponding end cover 1313 can be replaced, and the operation is relatively convenient.

[0066] It can be understood that the pre-paving assembly 120 can be provided with the same installation structure as the powder spreading assembly 130 to improve the levelness of the pre-paving tool 122 and the powder quality.

[0067] For the case where the pre-paving tool 122 is set as a cylindrical roller, a driving structure for driving the pre-paving tool 122 to rotate should also be provided in the powder spreading device 100. Similarly, for the case where the powder spreading tool 132 is set as a cylindrical roller, a driving structure for driving the powder spreading tool 132 to rotate should also be provided in the powder spreading device 100. Specifically, referring to Figure 1 , the powder spreading device 100 includes a first driving assembly 150. The first driving assembly 150 is detachably connected to the bracket 110. The first driving assembly 150 is in transmission connection with the pre-paving tool 122 and is used to drive the pre-paving tool 122 to rotate; when the pre-paving tool 122 is disassembled or moves relative to the bracket 110, by disassembling and installing the first driving assembly 150 and changing the installation position of the first driving assembly 150 on the bracket 110, the first driving assembly 150 can be kept in transmission connection with the pre-paving tool 122. Similarly, referring to Figure 2 , the powder spreading device 100 further includes a second driving assembly 160. The second driving assembly 160 is detachably connected to the bracket 110. The second driving assembly 160 is in transmission connection with the powder spreading tool 132 and is used to drive the powder spreading tool 132 to rotate; when the powder spreading tool 132 is disassembled or moves relative to the bracket 110, by disassembling and installing the second driving assembly 160 and changing the installation position of the second driving assembly 160 on the bracket 110, the second driving assembly 160 can be kept in transmission connection with the powder spreading tool 132.

[0068] In one embodiment, the first driving assembly 150 includes a first mounting seat 151 and a first driving element 152. The first driving element 152 is set as a motor, a servo, etc. capable of outputting rotational power. The first driving element 152 is mounted on the first mounting seat 151. The first mounting seat 151 is detachably connected to the bracket 110. The first driving element 152 is in transmission connection with the powder pre-spreading tool 122 and drives the powder pre-spreading tool 122 to rotate. The detachable connection manner between the first mounting seat 151 and the bracket 110 is not limited to threaded connection, snap connection, etc. The transmission connection manner between the first driving element 152 and the powder pre-spreading tool 122 is not limited to belt drive, chain drive, gear meshing, etc. Similarly, the second driving assembly 160 includes a second mounting seat 161 and a second driving element 162. The second driving element 162 is set as a motor, a servo, etc. capable of outputting rotational power. The second driving element 162 is mounted on the second mounting seat 161. The second mounting seat 161 is detachably connected to the bracket 110. The second driving element 162 is in transmission connection with the powder spreading tool 132 and drives the powder spreading tool 132 to rotate. The detachable connection manner between the second mounting seat 161 and the bracket 110 is not limited to threaded connection, snap connection, etc. The transmission connection manner between the second driving element 162 and the powder spreading tool 132 is not limited to belt drive, chain drive, gear meshing, etc.

[0069] It can be understood that when the powder pre-spreading assembly 120 includes multiple powder pre-spreading tools 122, one of the powder pre-spreading tools 122 is in transmission connection with the first driving element 152, and the adjacent powder pre-spreading tools 122 are in transmission connection; or each powder pre-spreading tool 122 is directly in transmission connection with the first driving element 152, so that the first driving element 152 can drive multiple powder pre-spreading tools 122 to rotate simultaneously. The transmission connection manner between the adjacent powder pre-spreading tools 122 is not limited to belt drive, chain drive, gear meshing, etc. Similarly, when the powder spreading assembly 130 includes multiple powder spreading tools 132, one of the powder spreading tools 132 is in transmission connection with the second driving element 162, and the adjacent powder spreading tools 132 are in transmission connection; or each powder spreading tool 132 is directly in transmission connection with the second driving element 162, so that the second driving element 162 can drive multiple powder spreading tools 132 to rotate simultaneously. The transmission connection manner between the adjacent powder spreading tools 132 is not limited to belt drive, chain drive, gear meshing, etc.

[0070] It should be noted that, according to the type of the powder, the rotation speed of the powder pre-spreading tool 122 can be adjusted through the first driving element 152, and the rotation speed of the powder spreading tool 132 can be adjusted through the second driving element 162, so that the rotation speeds of the powder spreading tool 132 and the powder pre-spreading tool 122 are adapted to the powder spreading requirements of the current powder, and the quality of the powder bed is improved.

[0071] The present utility model also provides a 3D printing device. Refer to Figure 3, including the powder spreading device 100 described above, further includes a powder spreading platform 200 which contains powder. The powder spreading device 100 moves relative to the powder spreading platform 200 in the first direction and spreads the powder on the powder spreading platform 200 during the movement.

[0072] Furthermore, the bracket 110 is provided with a sliding portion 115 which is slidably connected to the powder spreading platform 200 in the first direction, making the movement of the powder spreading device 100 relative to the powder spreading platform 200 more stable.

[0073] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the relevant art, various changes can be made without departing from the gist of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A powder spreading device, characterized in that: Used to spread powder on a powder spreading platform along a first direction, the powder spreading device comprises: Bracket; A pre-paving assembly, comprising a first mounting member and at least one pre-paving tool, wherein the pre-paving tool is connected to the first mounting member, and the pre-paving tool has a first state for performing powder laying and a second state away from the powder laying platform, and the first mounting member is movably connected to the bracket to enable the pre-paving tool to switch between the first state and the second state; A powder laying component, wherein the pre-laying component is located in front of the powder laying component in the first direction, and the powder laying component includes a second mounting member and at least one powder laying tool, wherein the powder laying tool is connected to the second mounting member, and the powder laying tool has a third state for laying powder and a fourth state away from the powder laying platform, and the second mounting member is movably connected to the bracket to enable the powder laying tool to switch between the third state and the fourth state.

2. The powder spreading device according to claim 1, characterized in that: The first mounting member is detachably connected to the bracket; And / or, the second mounting member is detachably connected to the bracket.

3. The powder spreading device according to claim 1, characterized in that: The first mounting member is vertically slidably connected to the bracket and can drive the pre-paving tool to rise and fall; And / or, the second mounting member is vertically slidably connected to the bracket and can drive the powder spreading tool to rise and fall.

4. The powder spreading device according to claim 1, characterized in that: One of the first mounting member and the bracket is provided with a first mounting hole extending vertically, and the other is provided with a second mounting hole. The pre-paving assembly further comprises a first locking member, which is passed through the first mounting hole and the second mounting hole to lock the first mounting member to the bracket, or to unlock the first mounting member so that the first mounting member can be lifted or lowered relative to the bracket. And / or, one of the second mounting member and the bracket is provided with a third mounting hole extending vertically, and the other is provided with a fourth mounting hole, and the pre-laying component also includes a second locking member, which is passed through the third mounting hole and the fourth mounting hole to lock the second mounting member to the bracket, or to unlock the second mounting member so that the second mounting member can be lifted or lowered relative to the bracket.

5. The powder spreading device according to any one of claims 1 to 4, characterized in that: The bracket includes a crossbeam and two oppositely arranged frames, the two ends of the crossbeam are respectively connected to the two frames, the powder spreading assembly is installed below the crossbeam and is located between the two frames, the crossbeam has a mounting groove, the second mounting piece is vertically inserted into the mounting groove, and the end of the second mounting piece along the second direction abuts against the groove wall of the mounting groove, and the second direction and the second direction are perpendicular to the vertical direction.

6. The powder spreading device according to claim 5, characterized in that: The powder spreading device also includes an elastic pad, which extends along the second direction. The elastic pad is accommodated in the mounting groove, the top of the elastic pad abuts against the groove wall of the mounting groove, and the bottom of the elastic pad abuts against the second mounting piece.

7. The powder spreading device according to claim 1, characterized in that: The powder spreading components are arranged in plurality along the first direction; And / or, the powder spreading assembly includes a plurality of the powder spreading tools arranged along the first direction.

8. The powder spreading device according to claim 1, characterized in that: The pre-paving tool has a powder-paving surface for laying powder, and the powder-paving surface is a plane, an inclined surface or a curved surface; or, the pre-paving tool is rotatably connected to the first mounting member, and the pre-paving tool is configured as a cylindrical roller; and / or, The powder spreading tool has a powder spreading surface for spreading powder, and the powder spreading surface is a plane, an inclined surface or a curved surface; or, the powder spreading tool is rotatably connected to the second mounting member, and the powder spreading tool is configured as a cylindrical roller.

9. The powder spreading device according to claim 1, characterized in that: The pre-paving tool is rotatably connected to the first mounting member, and the pre-paving tool is configured as a cylindrical roller. The powder spreading device further comprises a first driving assembly, which is detachably connected to the bracket, and is transmission-connected to the pre-paving tool and used to drive the pre-paving tool to rotate; The powder spreading tool is rotatably connected to the second mounting member, and the powder spreading tool is configured as a cylindrical roller. The powder spreading device further comprises a second driving assembly, and the second driving assembly is detachably connected to the bracket, and the second driving assembly is transmission-connected to the powder spreading tool and is used to drive the powder spreading tool to rotate.

10. 3D printing equipment, characterized in that include: The powder spreading device according to any one of claims 1 to 9; The powder spreading platform is used to accommodate powder, and the powder spreading device moves relative to the powder spreading platform along the first direction to spread powder on the powder spreading platform.

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