Sand mold 3D printing equipment
By designing automated sand mold 3D printing equipment and utilizing negative pressure cleaning components and recycling devices, the problems of high labor intensity and dust pollution in existing sand cleaning technologies have been solved, achieving efficient and environmentally friendly sand mold production.
Patent Information
- Application Number
- CN202511169890.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-20
- Publication Date
- 2025-09-23
Smart Images
Figure CN120679951A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of 3D printing, and in particular to a sand mold 3D printing device. Background Art
[0002] Sand 3D printing technology directly prints complex three-dimensional molds from sand. Sand 3D printing creates a mold with precise shape and dimensions by stacking layers of sand and spraying a binder on designated areas for curing. This technology is fast and eliminates the need for molds, allowing for a single-shot production. Compared to traditional sand mold manufacturing, 3D printing offers greater efficiency and lower production costs. Sand 3D printing has been widely used in aerospace, automotive, energy equipment, and other fields.
[0003] During 3D printing, the sand material is stacked layer by layer, and the sand mold solidifies and forms inside the stacked sand material. In other words, the printed sand mold is buried in the unsolidified sand material. Therefore, the unsolidified sand material needs to be removed to obtain the finished sand mold. In the prior art, 3D printed sand mold workpieces are usually manually cleaned off-line. That is, the sand mold workpiece is removed from the printing work area and then manually cleaned using a cleaning device. However, the dust and binder generated during the sand cleaning process are harmful to the human body, and manual sand cleaning is labor-intensive and inefficient. Summary of the Invention
[0004] To solve at least some of the problems in the prior art, an embodiment of the present invention provides a sand mold 3D printing device that reduces labor intensity and automatically performs printing and sand cleaning.
[0005] An embodiment of the present invention provides a sand mold 3D printing device, comprising a printing device, a carrying device, a sand cleaning device, and a control device. The carrying device comprises a workbench and a first movable portion, the first movable portion being connected to the workbench, and the first movable portion being used to drive the workbench to move in a vertical direction. The sand cleaning device comprises a first movable assembly, a negative pressure cleaning assembly, and a negative pressure assembly, the negative pressure cleaning assembly being mounted on the first movable assembly and located above the workbench, the negative pressure assembly being connected to the negative pressure cleaning assembly. A control device is connected to the carrying device, the printing device, and the sand cleaning device, respectively; the control device can control the printing device to cooperate with the first movable portion to print on the workbench.
[0006] In some embodiments, the first moving assembly includes a second moving portion and a third moving portion, the third moving portion is mounted on the second moving portion, the negative pressure cleaning assembly is mounted on the third moving portion, the second moving portion is used to drive the third moving portion to move along a first direction, and the third moving portion is used to drive the negative pressure cleaning assembly to move along a second direction, and the first direction, the second direction and the vertical direction are perpendicular to each other; The negative pressure component includes a negative pressure pipeline and a negative pressure pump, and the negative pressure pipeline is connected to the negative pressure pump and the negative pressure cleaning component.
[0007] In some embodiments, the negative pressure cleaning component includes a connecting part, a rotating part and a negative pressure suction part, the connecting part is connected to the first moving component, the rotating part is rotatably connected to the connecting part, one end of the negative pressure suction part is connected to the negative pressure component, and the other end of the negative pressure suction part is connected to the rotating part.
[0008] In some embodiments, the rotating part includes a first rotating part, a second rotating part and a first driving part, the first driving part is connected to the first rotating part and the connecting part respectively, the first driving part can drive the first rotating part to rotate around the connecting part with the vertical direction as the axis, the second rotating part is rotatably provided on the first rotating part, and the other end of the negative pressure suction part is connected to the second rotating part.
[0009] In some embodiments, the rotating part also includes a second driving part, which is respectively connected to the first rotating part and the second rotating part. The second driving part can drive the second rotating part to rotate around the first rotating part with the horizontal direction as the axis, and the horizontal direction is perpendicular to the vertical direction.
[0010] In some embodiments, the sand mold 3D printing equipment also includes a recovery device, which is connected to the control device. The recovery device includes a negative pressure recovery tank, and the negative pressure pump, the negative pressure recovery tank and the negative pressure pipeline are connected in sequence.
[0011] In some embodiments, the recovery device further comprises a stirring tank and a first conveyor, the printing device comprises a feeding assembly and a sand laying assembly, and the feeding assembly comprises a sand storage unit, a second conveyor and a sand mixer; The negative pressure recovery tank is arranged above the mixing tank, and a first discharge port is provided at the bottom of the negative pressure recovery tank, and the first discharge port is vertically aligned with the mixing tank. The first conveyor is used to convey the sand in the mixing tank to the sand mixer, and the second conveyor is used to convey the sand in the sand storage part to the sand mixer. The sand mixer can supply sand to the sand laying assembly.
[0012] In some embodiments, the recovery device also includes a used sand collecting part, a used sand conveying part and a recovery pipeline. The printing device includes a sand laying assembly. The used sand assembly is arranged below the sand laying assembly. The height of the used sand collecting part is lower than the highest height of the workbench. The used sand collecting part has a used sand discharge port and an opening open upward. The used sand conveying part is arranged in the used sand collecting part. The recovery pipeline is connected to the used sand discharge port and the negative pressure recovery tank.
[0013] In some embodiments, the sand mold 3D printing equipment has a printing station and a first cleaning station located on one side of the printing station. The sand mold 3D printing equipment also includes a moving device, the printing device is located at the printing station, the sand cleaning device is located at the first cleaning station, the moving device is located at the first cleaning station and the printing station, and the carrying device is located at the first cleaning station and connected to the moving device.
[0014] In some embodiments, the sand mold 3D printing equipment further has a second cleaning station, which is located on the other side of the printing device and on a different side of the printing station as the first cleaning station. The number of the sand cleaning devices is two, and the first cleaning station and the second cleaning station are respectively provided with sand cleaning devices. The number of the carrying devices is two, and the two carrying devices are respectively provided at the first cleaning station and the second cleaning station. The mobile device is also provided at the second cleaning station, and the two carrying devices are respectively connected to the mobile device.
[0015] The sand mold 3D printing device provided by the embodiment of the present invention has at least the following beneficial effects: The sand mold 3D printing device provided by the embodiment of the present invention, when performing 3D printing, controls the printing device to cooperate with the first movable part and the workbench through the control device, so that the printing device prints the sand mold on the workbench. After printing is completed, the control device continues to control the negative pressure component, the first movable component and the first movable part to cooperate, so that the negative pressure cleaning component moves on the workbench to clean the sand on the sand mold and the workbench. In this way, the sand mold 3D printing device provided by the embodiment of the present invention can automatically print and clean, and there is no need for manual sand cleaning after printing, and no manual participation is required during the printing process and the sand cleaning process, which can effectively reduce manual labor intensity, protect personnel health, and realize fully automatic, green, and environmentally friendly production. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0017] Figure 1 Schematic diagram of the overall structure of a sand mold 3D printing device in one embodiment of the present invention.
[0018] Figure 2 Schematic diagram of the overall structure of a sand mold 3D printing device in another embodiment of the present invention.
[0019] Figure 3 for Figure 2 Another perspective diagram is shown.
[0020] Figure 4 for Figure 3 A magnified schematic diagram shown in the middle.
[0021] Figure 5 for Figure 2 Schematic diagram of the partial structure of the recovery device and the cleaning device.
[0022] Figure 6 for Figure 3 Schematic diagram of the partial structure of the first conveyor.
[0023] [Description of Reference Numerals] 10. Sand mold 3D printing equipment; 11. Printing station; 12. First cleaning station; 13. Second cleaning station; 14. Mounting frame; 20. Carrying device; 21. Workbench; 22. First moving part; 23. Work box; 24. Work accommodating chamber; 30. Printing device; 31. Feeding assembly; 311. Sand storage unit; 312. Second conveyor; 313. Sand mixer; 32. Sand laying assembly; 33. Printing assembly; 34. Fourth moving part; 35. Fifth moving part; 40. Sand cleaning device; 41. First moving assembly; 411. Second moving assembly Part; 412, third moving part; 42, negative pressure cleaning component; 421, connecting part; 422, rotating part; 4221, first rotating part; 4222, second rotating part; 423, negative pressure suction part; 43, negative pressure component; 431, negative pressure pump; 432, negative pressure pipeline; 50, recovery device; 51, negative pressure recovery tank; 511, first discharge port; 52, stirring tank; 53, first conveyor; 54, old sand collecting part; 541, old sand discharge port; 55, old sand conveying part; 56, recovery pipeline; 60, control device; 70, moving device. DETAILED DESCRIPTION
[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.
[0025] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts should fall within the scope of protection of the present invention.
[0026] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.
[0027] It should also be noted that the division of the various embodiments of the present invention is for convenience of description only and should not constitute a particular limitation. The features of the various embodiments can be combined and referenced to each other where there is no contradiction. In the accompanying drawings, X indicates a first direction, Y indicates a second direction, and Z indicates a vertical direction.
[0028] Based on this, the embodiment of the present invention provides a sand mold 3D printing device 10, such as Figure 1-3 As shown, the sand mold 3D printing device 10 includes, for example, a carrying device 20 , a printing device 30 , a sand cleaning device 40 and a control device 60 .
[0029] Specifically, the control device 60 is connected to the carrier device 20, the printing device 30, and the sand cleaning device 40, respectively, to control the carrier device 20, the printing device 30, and the sand cleaning device 40 to cooperate with each other to complete the printing and sand cleaning operations. The control device 60 can be, for example, a PLC (Programmable Logic Controller).
[0030] The carrying device 20 includes a workbench 21 and a first movable portion 22. The workbench 21 is connected to the first movable portion 22, and the first movable portion 22 is used to drive the workbench 21 in a vertical direction. The workbench 21 provides an area for performing 3D printing of sand molds and can carry printed sand molds as well as unbonded sand grains after printing. For example, the workbench 21 has a working surface, so that sand molds can be printed on the working surface and sand can also be cleaned on the working surface to obtain a sand mold. The workbench 21 can be, for example, a flat table, and its working surface can be, for example, the upward-facing surface of the flat table. Specifically, the carrying device 20 also includes a working box 23, the workbench 21 and the first movable part 22 are arranged in the working box 23, and the inner wall of the working box 23 and the workbench 21 are surrounded to form a working accommodating chamber 24 for accommodating sand and sand molds during printing. In this way, the inner wall of the working box 23 can block the sand particles, thereby preventing the sand particles from moving out of the range of the workbench 21, which helps to improve the cleanliness of the working environment; and the inner wall of the working box 23 can also keep the sand particles on the workbench 21 stable, avoid the collapse of the sand pile, thereby helping to improve the printing effect and improve the stability of the printing process.
[0031] The control device 60 can control the printing device 30 to cooperate with the first moving part 22 to print on the workbench 21. The first moving part 22 drives the workbench 21 in the vertical direction (ie, Figure 1 The printing device 30 moves in the Z direction (as shown) to cooperate with the printing device 30 to perform sand laying and bonding and curing layer by layer on the workbench 21, thereby realizing the printing of the sand mold.
[0032] Specifically, the printing device 30 may include, for example, a feeding component 31, a sanding component 32, a printing component 33, a fourth moving part 34, and a fifth moving part 35. The fifth moving part 35 is mounted on the fourth moving part 34, and the printing component 33 is mounted on the fifth moving part 35. The fourth moving part 34 can drive the fifth moving part 35 to move in a first direction (such as Figure 1 The fifth moving part 35 is used to drive the printing assembly 33 to move along the second direction (as shown in the X direction). Figure 1The fourth movable portion 34 is also equipped with a sand-laying assembly 32, which can also drive the sand-laying assembly 32 to move along the first direction. The feeding assembly 31 is connected to the printing assembly 33 and the sand-laying assembly 32, respectively. The feeding assembly 31 can supply adhesive to the printing assembly 33, and the feeding assembly 31 can supply sand to the sand-laying assembly 32. The fourth movable portion 34 can drive the sand-laying assembly 32 to move along the first direction, so that the sand-laying assembly 32 can lay sand on the workbench 21 and level the sand layer, so that the sand-laying assembly 32 can cooperate with the first movable portion 22 to lay sand layer by layer and level the sand layer. The fourth moving portion 34 and the fifth moving portion 35 can drive the printing assembly 33 to move along the first direction and the second direction. The first direction, the second direction, and the vertical direction are perpendicular to each other. Therefore, it can be understood that the first direction and the second direction are respectively directions on the horizontal plane. Then, the movement in the first direction and the movement in the second direction are combined to form a movement on the horizontal plane. Therefore, the fourth moving portion 34 and the fifth moving portion 35 can drive the printing assembly 33 to move on the horizontal plane to spray the binder on the designated area of the laid sand layer, thereby achieving the solidification of the sand particles. The feeding assembly 31 includes, for example, a sand storage 311, a second conveyor 312, a sand mixer 313, a sand supply, and an ink supply unit. The sand storage 311 is connected to the second conveyor 312. The second conveyor 312 is used to transport sand to the sand mixer 313. The sand mixer 313 is connected to the sand supply unit. The sand mixer can transport sand to the sand supply unit and further transport it to the sand laying assembly 32. The ink supply unit is used to supply ink, that is, supply binder, to the printing assembly 33. The specific structures of the sand-laying assembly 32 , the printing assembly 33 , the fourth moving part 34 and the fifth moving part 35 can be set with reference to the prior art and will not be described in detail here.
[0033] The sand cleaning device 40, for example, includes a first movable assembly 41, a negative pressure cleaning assembly 42, and a negative pressure assembly 43. The negative pressure cleaning assembly 42 is mounted on the first movable assembly 41 and positioned above the workbench 21. The negative pressure assembly 43 is connected to the negative pressure cleaning assembly 42. The negative pressure assembly 43 generates a negative pressure, thereby creating a negative pressure in the negative pressure cleaning assembly 42. The negative pressure in the negative pressure cleaning assembly 42 can then draw sand from the surface of the sand mold and the workbench 21. The control device 60 can control the negative pressure assembly 43, the first movable assembly 41, and the first movable portion 22 to cooperate, causing the negative pressure cleaning assembly 42 to perform negative pressure sand cleaning on the workbench 21.
[0034] Specifically, the negative pressure component 43 can be used to generate negative pressure, thereby forming a negative pressure environment in the negative pressure cleaning component 42. That is, the air pressure in the negative pressure cleaning component 42 is lower than the external air pressure, so that the external air flows into the negative pressure cleaning component 42. The airflow thus formed drives the sand into the negative pressure cleaning component 42, thereby achieving negative pressure sand cleaning. The negative pressure provided by the negative pressure component 43 enables the negative pressure cleaning component 42 to clean the workbench 21 and the sand mold without manual sand cleaning; it also helps to connect with other equipment later to achieve sand recycling and reuse; and the negative pressure absorption method can absorb volatile substances released into the air by adhesives, etc., thereby reducing the concentration of pollutants in the working environment air and helping to achieve environmentally friendly production.
[0035] Specifically, the first moving component 41 can drive the negative pressure cleaning component 42 to move in the first direction and the second direction, that is, the first moving component 41 can drive the negative pressure cleaning component 42 to move in the first direction and the second direction (that is, move forward and backward and left and right on the horizontal plane), so that the control device 60 can control and cooperate with the first moving part 22 so that the negative pressure cleaning component 42 can clean sand on the workbench 21.
[0036] The specific implementation process of the sand mold 3D printing device 10 in the embodiment of the present invention is as follows: First, the data for the sand mold to be printed is imported into the control device 60, and printing begins. The control device 60 controls the printing device 30 to work with the first movable portion 22 to lay and level the first layer of sand on the workbench 21. After the sand is laid, the printing device 30 is controlled by the control device 60 to spray a binder onto designated areas of the laid sand layer according to the sand mold data, causing the sand grains in the designated areas to bond and solidify. Once solidified, the first layer of the sand mold is printed. After the first layer of sand is printed, the control device 60 controls the first movable portion 22 to lower the workbench 21, allowing the printing device 30 to lay a second layer of sand on top of the first. This process is repeated to print the second layer of sand. This process is repeated, printing the sand mold layer by layer. Once the entire sand mold is printed, only a portion of the sand grains in each layer solidify, leaving unsolidified sand grains on the workbench 21, and the finished sand mold is buried in the accumulated sand grains. Then the control device 60 controls the negative pressure component 43 to generate negative pressure, so that the negative pressure cleaning component 42 forms a negative pressure. It can be understood that when printing a sand mold, the workbench 21 needs to be lowered to a corresponding height for each layer printed. Therefore, when cleaning the sand, the upper sand particles accumulated on the workbench 21 are cleared first. The first moving component 41 moves the negative pressure cleaning component 42, which forms a negative pressure, to different positions above the workbench 21, thereby sucking away the sand particles accumulated at different positions on the workbench 21 through the negative pressure. The control device 60 controls the first moving part 22 to drive the workbench 21 to rise, so that the negative pressure cleaning component 42 continues to absorb the sand particles. This is repeated, so that all the sand particles on the workbench 21 are sucked away, and the finished sand mold is directly obtained without the need for manual sand cleaning.
[0037] The sand mold 3D printing device 10 provided in an embodiment of the present invention, during 3D printing, controls the printing device 30, the first movable portion 22, and the workbench 21 via the control device 60, so that the printing device 30 prints the sand mold on the workbench 21. After printing is completed, the control device 60 continues to control the negative pressure component 43, the first movable portion 41, and the first movable portion 22, so that the negative pressure cleaning component 42 moves on the workbench 21 to clean the sand from the sand mold and the workbench 21. In this way, the sand mold 3D printing device 10 provided in an embodiment of the present invention can automatically print and clean, and the finished sand mold can be directly produced from the sand mold 3D printing device 10 without manual sand cleaning. No human intervention is required during the printing and sand cleaning process, which can effectively reduce labor intensity, protect personnel health, and achieve fully automatic, green, and environmentally friendly production.
[0038] In some specific embodiments, the first moving portion 22 includes a first transmission member and a first driver. The first transmission member is connected to the first driver and the worktable 21. The first driver can drive the first transmission member, thereby moving the worktable 21 vertically. Furthermore, the first moving portion 22 includes a first guide member connected to the worktable 21 to guide the vertical movement of the worktable 21, thereby ensuring more stable vertical movement of the worktable 21. The first transmission member, for example, is a ball screw, vertically disposed and connected to the worktable 21 and the first driver. Ball screws offer high precision, low friction, and high rigidity, enabling better vertical transmission during printing and cleaning. The first driver can be, for example, a servo motor, providing more precise and reliable drive for the first transmission member. Alternatively, the first driver can be a stepper motor, offering easier control and lower cost. The first guide member, for example, is a linear guide, providing support and guidance for the worktable 21, ensuring more stable vertical movement of the worktable 21.
[0039] In some embodiments, such as Figure 1-3 As shown, the first moving assembly 41 includes a second moving portion 411 and a third moving portion 412. The third moving portion 412 is mounted on the second moving portion 411, and the negative pressure cleaning assembly 42 is mounted on the third moving portion 412. The second moving portion 411 is used to drive the third moving portion 412 to move in the first direction, and the third moving portion 412 is used to drive the negative pressure cleaning assembly 42 to move in the second direction. In other words, the second moving portion 411 and the third moving portion 412 cooperate to drive the negative pressure cleaning assembly 42 to move in the plane formed by the first direction and the second direction, that is, to move in the horizontal plane. Therefore, the first moving portion 22 and the second moving portion 411 can be controlled by the control device 60 to cooperate with the first moving portion 22 moving in the vertical direction, so that the negative pressure cleaning assembly 42 can clean sand on the workbench 21.
[0040] Specifically, the second moving part 411 adopts, for example, a coordinated moving structure of a linear motor and a guide rail, wherein the guide rail is arranged along a first direction, the linear motor is arranged on the guide rail, and the third moving part 412 is connected to the linear motor. The linear motor can move along the guide rail in the first direction, thereby driving the third moving part 412 to move along the first direction. In this way, the combination of a linear motor and a guide rail for driving has the advantages of low friction and high efficiency, can achieve high-precision positioning, and helps to achieve stable movement of the third moving part 412, so that the negative pressure cleaning component 42 can more stably remove sand particles. The second moving part 411 can also adopt, for example, a ball screw and a motor, the ball screw including a screw and a nut, the screw being arranged along the first direction, the motor drivingly connected to the screw, the nut being connected to the screw and connected to the third moving part 412. The motor drives the screw to rotate, causing the nut to move along the first direction, thereby driving the third moving part 412 to move along the first direction. The motor is, for example, a servo motor or a stepper motor. In this way, a combination of a ball screw and a motor is used for driving, which has low friction, high efficiency, compact structure and high rigidity, and can stably and accurately drive the third moving part 412 to enable the negative pressure cleaning component 42 to achieve high-precision stable movement.
[0041] Specifically, the third moving portion 412 may, for example, utilize a structure that cooperates with a linear motor and a guide rail. The guide rail is positioned along the second direction, the linear motor is disposed on the guide rail, and the negative pressure cleaning assembly 42 is connected to the linear motor. The linear motor can move along the guide rail in the second direction, thereby driving the negative pressure cleaning assembly 42 to move in the second direction. In this manner, the linear motor and guide rail combination for driving has the advantages of low friction and high efficiency, enabling high-precision positioning, thereby facilitating high-precision movement of the negative pressure cleaning assembly 42 to more thoroughly remove sand particles. Alternatively, the third moving portion 412 may utilize a ball screw and a motor. The ball screw includes a screw and a nut. The screw is positioned along the second direction, the motor is drivably connected to the screw, and the nut is connected to the screw and to the negative pressure cleaning assembly 42. The motor drives the screw to rotate, causing the nut to move in the second direction, thereby driving the negative pressure cleaning assembly 42 to move in the second direction. The motor may be, for example, a servo motor or a stepper motor. In this way, a combination of a ball screw and a motor is used for driving, which has low friction, high efficiency, compact structure and high rigidity, and can be driven stably and accurately to enable the negative pressure cleaning component 42 to achieve high-precision stable movement.
[0042] Furthermore, the second moving part 411 adopts a cooperative moving structure of a linear motor and a guide rail, for example, there are two guide rails, the two guide rails are arranged along the second direction, a linear motor is respectively provided on the two guide rails, and the two linear motors are respectively connected to the third moving part 412, that is, the third moving part 412 is bridged over the two guide rails, so that the third moving part 412 forms a gantry structure with the guide rails and the linear motor, so the third moving part 412 can be more stably installed on the linear motor; the two linear motors cooperate with each other and move along the guide rails respectively to drive the third moving part 412, which can also make the movement of the third moving part 412 more stable, so that the accuracy and stability of the movement of the mobile negative pressure cleaning component 42 can be improved.
[0043] In some embodiments, such as Figure 4 As shown, the negative pressure cleaning assembly 42 includes a connecting portion 421, a rotating portion 422, and a negative pressure suction portion 423. The connecting portion 421 is connected to the first moving assembly 41, the rotating portion 422 is rotatably connected to the connecting portion 421, one end of the negative pressure suction portion 423 is connected to the negative pressure assembly 43, and the other end of the negative pressure suction portion 423 is connected to the rotating portion 422. One end of the negative pressure suction portion 423 is connected to the negative pressure assembly 43, so that the recovery device 50 generates negative pressure, so that the negative pressure suction portion 423 can form a negative pressure, so that the other end of the negative pressure suction portion 423 can perform negative pressure suction and sand cleaning. The rotating portion 422 can rotate relative to the connecting portion 421, and can drive one end of the negative pressure suction portion 423 to rotate, so that the negative pressure suction portion 423 can change its angle during negative pressure sand cleaning, so that the negative pressure suction portion 423 can better absorb the sand particles, so as to absorb the sand particles more comprehensively and thoroughly; at the same time, the degree of freedom of the negative pressure suction portion 423 can be improved, and the range of movement of the negative pressure suction portion 423 can be widened, so that the negative pressure suction portion 423 can be applicable to sand molds of various shapes, thereby improving versatility and better absorbing sand particles on the surface of the sand mold.
[0044] Specifically, the negative pressure suction part 423 is, for example, a hose, and the negative pressure component 43 is connected to one end of the hose. The component can form a negative pressure environment in the hose, thereby forming an airflow from the outside to the other end of the hose. The airflow drives the sand particles to move, causing the sand particles to flow into the other end of the hose, thereby realizing negative pressure sand cleaning.
[0045] Specifically, see Figure 4The rotating part 422 includes a first rotating part 4221, a second rotating part 4222 and a first driving part. The first driving part is connected to the first rotating part 4221 and the connecting part 421 respectively. The first driving part can drive the first rotating part 4221 to rotate around the connecting part 421 with the vertical direction as the axis. The second rotating part 4222 is rotatably provided on the first rotating part 4221, and the other end of the negative pressure suction part 423 is connected to the second rotating part 4222. That is to say, the second rotating part 4222 can be further rotated relative to the first rotating part 4221, that is, the second rotating part 4222 can be driven to rotate by the first rotating part 4221, and the other end of the negative pressure suction part 423 can be further driven to rotate by the second rotating part 422, thereby further increasing the angle that the negative pressure suction part 423 can change during negative pressure sand cleaning, so that the negative pressure cleaning component 42 can more conveniently absorb sand particles in various corners and gaps, and further enhance the suction effect of the negative pressure suction part 423 on sand particles, thereby improving the suction capacity of sand particles in corners and gaps, helping to improve the efficiency of sand cleaning and reduce the probability of sand residue; at the same time, the degree of freedom of the negative pressure suction part 423 can be further improved, and the range of activity of the negative pressure suction part 423 can be further widened, so that the negative pressure suction part 423 can be applicable to sand molds of various shapes, thereby further improving versatility. The first rotating portion 4221 can rotate about the connecting portion 421 with the vertical axis as the axis. Therefore, the first rotating portion 4221 can drive the second rotating portion 4222, and in turn drive the other end of the negative pressure suction portion 423 to rotate with the vertical axis as the axis, so that the negative pressure suction portion 423 can perform negative pressure sand suction at different angles. The first driving portion may include, for example, a first driving motor and a first rotating shaft. The first driving motor and the first rotating shaft are in transmission connection to drive the first rotating shaft to rotate with the vertical axis as the axis. Specifically, for example, the first driving motor is disposed on the connecting portion 421, and the first transmission shaft is connected to the first rotating portion 4221; or in another example, the first driving motor is disposed on the first rotating portion 4221, and the first transmission shaft is connected to the connecting portion 421. The first driving motor may be, for example, a servo motor, a stepper motor, or a brushless DC motor. In some specific embodiments, the first driving unit can drive the first rotating unit 4221 to rotate 360 degrees around the connecting portion 421 with the vertical direction as the axis, thereby driving the negative pressure suction unit 423 to rotate 360 degrees, making the negative pressure suction unit 423 more flexible and better able to remove sand particles. Specifically, the first driving unit can drive the first rotating unit 4221 to rotate 180 degrees clockwise and 180 degrees counterclockwise with the vertical direction as the axis. This allows the negative pressure suction unit 423 to achieve 360-degree rotation while preventing damage to the negative pressure suction unit 423 caused by excessive rotation.
[0046] Further, see Figure 4The rotating part 422 further includes a second driving part, which is connected to the first rotating part 4221 and the second rotating part 4222 respectively. The second driving part can drive the second rotating part 4222 to rotate around the first rotating part 4221 with the horizontal direction as the axis. The horizontal direction is perpendicular to the vertical direction. The specific rotation direction is, for example, Figure 5 Therefore, the second rotating portion 4222 can be driven by the second driving portion to rotate, thereby driving the other end of the negative pressure suction portion 423 to rotate, so that the negative pressure suction portion 423 can suction sand from more angles, further increasing the angles that the negative pressure suction portion 423 can change when performing negative pressure sand cleaning, so that the negative pressure cleaning component 42 can more conveniently suck sand from various corners and gaps, and further enhance the sand suction effect of the negative pressure suction portion 423; at the same time, the degree of freedom of the negative pressure suction portion 423 can be further increased, and the range of movement of the negative pressure suction portion 423 can be further widened, so that the negative pressure suction portion 423 can be applied to sand molds of various shapes, further improving its versatility. The second drive unit, for example, includes a second drive motor and a second rotating shaft. The second drive motor and the second rotating shaft are in transmission connection to drive the second rotating shaft to rotate about a vertical axis. Specifically, for example, the second drive motor is disposed on the first rotating unit 4221, and the second rotating shaft is connected to the second rotating unit 4222. In another example, the second drive motor is disposed on the second rotating unit 4222, and the second rotating shaft is connected to the first rotating unit 4221. The second drive motor is, for example, a servo motor, a stepper motor, or a brushless DC motor. In some specific embodiments, the second drive unit drives the second rotating unit 4222 to rotate through an angle of, for example, 120 degrees. This allows the negative pressure suction unit 423423 to achieve negative pressure suction while preventing damage due to excessive rotation of the negative pressure suction unit 423423, thereby helping to reduce equipment failure rates and increase equipment service life. Specifically, for example, with the vertical direction as the angle bisector, the second driving unit can drive the second rotating unit 4222 to rotate 60 degrees clockwise and 60 degrees counterclockwise around the horizontal direction, thereby improving the mobility of the negative pressure suction unit 423 while avoiding damage to the negative pressure suction unit 423.
[0047] In some embodiments, see Figure 1-5The sand mold 3D printing device 10 also includes a recovery device 50, which is connected to the control device 60. The recovery device 50 includes a negative pressure recovery tank 51, a negative pressure pump 431, a negative pressure recovery tank 51, and a negative pressure pipeline 432. The negative pressure pump 431 can extract air from the negative pressure recovery tank 51, thereby forming a negative pressure environment in the negative pressure recovery tank 51. Since the negative pressure pipeline 432 is connected to the negative pressure recovery tank 51, a negative pressure environment is also formed in the negative pressure pipeline 432. Therefore, the negative pressure cleaning component 42 can perform negative pressure sand suction. The sand enters the negative pressure pipeline 432 from the negative pressure cleaning component 42 and then enters the negative pressure recovery tank 51. The negative pressure recovery tank 51 can recover the sucked sand to facilitate the subsequent reuse of the sand. In this way, the recycling rate of the sand can be improved, thereby reducing the printing cost.
[0048] The recovery device 50 also includes a mixing tank 52 and a first conveyor 53. The feeding assembly 31 includes a sand storage unit 311, a second conveyor 312, and a sand mixer 313. The negative pressure recovery tank 51 is positioned above the mixing tank 52. A first discharge port 511 is provided at the bottom of the negative pressure recovery tank 51, which vertically corresponds to the mixing tank 52. The first conveyor 53 is used to transport sand from the mixing tank 52 to the sand mixer 313, while the second conveyor 312 is used to transport sand from the sand storage unit 311 to the sand mixer 313. The sand mixer 313 can then supply sand to the sand-laying assembly 32. After the sand is drawn into the negative pressure recovery tank 51, it is pulled by gravity and falls from the first discharge port 511 into the mixing tank 52, where it is agitated. After agitation is complete, the sand is then transported to the sand mixer 313 by the first conveyor 53. The mixing tank 52 can stir the sand inside it to prevent sand from clumping and help remove adhesives and curing agents adhering to the sand surface, thereby improving the performance of the sand when reused. The mixing tank 52 may include, for example, a housing for holding the sand and a spiral agitator disposed within the housing to stir the sand within. The sand storage component 311 is used to hold new sand. The sand storage component 311 may be, for example, a funnel-shaped sand hopper with an open bottom. The sand hopper has a chamber for holding the sand, into which the sand flows under the influence of gravity and the inner wall of the hopper. It is understood that new sand refers to unused sand. Thus, after the recovered sand is stirred, it can enter the sand mixer 313, where it is mixed with new sand and then transported to the sand spreading assembly 32 for reuse. In this way, the utilization rate of sand can be improved, waste can be reduced and costs can be lowered. Mixing new sand with used and processed sand before reuse can help improve the quality of sand delivered to the sand laying component 32. Compared with directly using used and processed sand, the quality of the mixed sand is higher, which helps to improve printing quality.
[0049] Specifically, the first conveyor 53 and the second conveyor 312 are both equipped with a conveying pipe and a spiral chip conveyor, for example. Figure 6 , Figure 6 This is a schematic diagram of the structure of the spiral chip conveyor used in the first conveyor 53. The conveying pipe is connected to the mixing tank 52 and the sand storage unit 311, respectively. The spiral chip conveyor is located in the conveying pipe and is used to transport sand entering the conveying pipe from the mixing tank 52 or the sand storage unit 311 to the sand mixer 313. The spiral chip conveyor can adapt to sand of different materials, has a compact structure, low maintenance costs, and can be applied to different working conditions. The discharge port of the mixing tank 52 and the sand storage unit 311 is, for example, located at the bottom. The conveying pipe is connected to the discharge port at the bottom. Sand enters the conveying pipe through the discharge port and is then transported to the sand mixer 313 by the spiral chip conveyor.
[0050] In some embodiments, see Figure 1-3 The recovery device 50 also includes a used sand collecting member 54, a used sand conveying member 55, and a recovery pipeline 56. The used sand assembly is arranged below the sand laying assembly 32. The used sand collecting member 54 is arranged at a height lower than the highest height of the workbench 21. The used sand collecting member 54 has a used sand discharge port 541 and an upwardly open opening. In this way, when the sand laying assembly 32 is laying sand and leveling the sand layer on the workbench 21, the sand falling from the workbench 21 can fall into the used sand collecting member 54 through the upwardly open opening of the used sand collecting member 54, so that the used sand collecting member 54 can collect the sand falling from the workbench 21. The recovery pipeline 56 is connected to the used sand discharge port 541. The recovery pipeline 56 is connected to the negative pressure recovery tank 51. A used sand conveying member 55 is provided in the used sand collecting member 54. The used sand conveying member 55 is used to convey the used sand to the used sand discharge port 541. Therefore, the old sand conveying member 55 can convey the sand collected by the old sand collecting member 54 to the old sand discharge port 541, and a negative pressure can also be formed in the recovery pipe 56, so that the old sand can be sucked away by the recovery pipe 56 and enter the negative pressure recovery tank 51 for recycling. In this way, the recycling rate of sand can be further improved and the cost can be further reduced. It should be noted that the old sand refers to the sand that falls out of the workbench 21 during printing, such as the sand that is pushed out of the workbench 21 when the sand layer is leveled after laying the sand. It should be noted that the highest height of the workbench 21 is also the height of the workbench 21 before the printing work starts. Before the printing work starts, the height of the workbench 21 is the highest. As the sand laying and printing are carried out layer by layer, the height of the workbench 21 also decreases layer by layer.
[0051] Specifically, see Figure 1-3There are two used sand collecting members 54, which are arranged along the first direction. The workbench 21 can be accommodated between the two used sand collecting members 54. The two used sand collecting members 54 are respectively provided with used sand conveying members 55 and are respectively connected to recovery pipes 56. In this way, when the sand laying assembly 32 is laying sand and leveling the sand layer, the used sand collecting members 54 are provided on both sides of the workbench 21, so that the sand particles falling from the workbench 21 can be further collected, which helps to further improve the sand recovery rate and help to improve the cleanliness of the working environment.
[0052] Specifically, for example, the used sand collection member 54 includes a housing that encloses a used sand collection chamber. The housing is provided with a used sand discharge port 541 that communicates with the used sand recovery chamber. A used sand conveyor 55 is disposed within the used sand collection chamber. The used sand collection member 54 is, for example, a spiral chip conveyor, comprising a speed reducer and a spiral shaft with spiral blades. The speed reducer is connected to the spiral shaft to drive the spiral shaft to rotate, thereby moving the sand. The spiral chip conveyor can accommodate sand of various materials, has a compact structure, low maintenance costs, and is adaptable to various working conditions.
[0053] In some embodiments, valves are provided on the recovery line 56 and the negative pressure line 432, respectively, and are connected to a control device 60. The control device 60 can control the opening and closing of the valves, thereby controlling whether the recovery line 56 and the negative pressure line 432 are connected to the negative pressure recovery tank 51, respectively, and controlling the negative pressure state in the recovery line 56 and the negative pressure line 432. In this way, the control device 60 can better control the waste sand recovery process and the negative pressure sand suction process. Specifically, the recovery device 50 also includes a connecting pipeline, wherein the recovery pipeline 56 is connected to the negative pressure pipeline 432, and then connected to the negative pressure recovery tank 51 via the connecting pipeline. This can facilitate the installation of the negative pressure recovery tank 51, reduce the number of interfaces required for the negative pressure recovery tank 51 to connect to the pipeline, and facilitate maintenance. In addition, the control device 60 can control the opening and closing of the valves, thereby respectively controlling whether the recovery pipeline 56 and the negative pressure pipeline 432 are connected to the connecting pipeline. This can prevent the airflow in the recovery pipeline 56 and the negative pressure pipeline 432 from interfering with each other when the valves are opened at the same time, thereby preventing the movement of sand particles and hindering the recovery of sand particles. For example, the control device 60 controls the valve of the negative pressure pipeline 432 to close and the valve of the recovery pipeline 56 to open, thereby connecting the recovery pipeline 56 to the connecting pipeline. The sand particles in the recovery pipeline 56 can enter the negative pressure recovery tank 51 through the connecting pipeline without being affected by the airflow in the negative pressure pipeline 432. The above is only one of the working conditions in the embodiment of the present invention and is not intended to limit the embodiment of the present invention.
[0054] In some embodiments, the sand mold 3D printing device 10 further includes a sand metering device, which is provided in the sand mixer 313. The sand metering device is used to monitor the weight of the sand, thereby helping to ensure that the amount of sand supplied to the sand laying assembly 32 by the sand mixer 313 meets production requirements, and also helps to adjust the production rhythm. The sand metering device can be, for example, a weighing sensor, which is provided in the sand mixer to accurately measure the weight of the sand in real time. The number of sand metering devices can be multiple, for example, the mixing tank 52 and the sand storage unit 311 are also provided with sand metering devices. In this way, the weight of the recovered sand and the new sand can be monitored simultaneously. Then, the control device 60 can adjust the ratio of the recovered sand to the new sand in real time based on the data obtained by the sand metering device, thereby helping to adapt to different working conditions.
[0055] In some embodiments, the sand mold 3D printing apparatus 10 further includes a curing agent feeder connected to the sand mixer 313 for feeding a curing agent into the sand mixer 313 to mix the sand particles in the sand mixer 313 with the curing agent. This allows the curing agent to react with the binder to bond the sand particles during printing. This allows the sand mold 3D printing apparatus 10 to be applied to a wider range of working conditions.
[0056] In some embodiments, see Figure 2 and Figure 3The sand mold 3D printing device 10 includes a printing station 11 and a first cleaning station 12 located on one side of the printing station 11. The sand mold 3D printing device 10 also includes a moving device 70. The printing device 30 is located at the printing station 11, the sand cleaning device 40 is located at the first cleaning station 12, the moving device 70 is located at the first cleaning station 12 and the printing station 11, and the carrying device 20 is located at the first cleaning station 12 and connected to the moving device 70. The moving device 70 can be controlled by the control device 60 to move the carrying device 20 between the printing station 11 and the first cleaning station 12. That is, the carrier device 20 can be moved to the printing station 11 by the moving device 70, so that in the printing station 11, the first moving part 22 cooperates with the printing device 30 to perform printing on the workbench 21. The moving device 70 can be, for example, a track and a track trolley. The track is laid between the first cleaning station 12 and the printing station 11. The track trolley is installed on the track and connected to the carrier device 20. The track trolley can drive the carrier device 20 to move along the track between the first cleaning station 12 and the printing station 11. After printing is completed, the carrier device 20 can be moved to the first cleaning station 12 by the moving device 70. In the first cleaning station 12, the first moving assembly 41 and the negative pressure cleaning assembly 42 cooperate with the first moving part 22 to perform sand removal operations on the workbench 21. In this way, setting up multiple workstations can reduce the integration of the equipment, thereby reducing the difficulty of manufacturing the equipment and helping to reduce the cost of the equipment; and, the printing device 30 and the sand cleaning device 40 are set at different workstations, which can avoid conflicts during work, help reduce the failure rate of equipment operation, and facilitate maintenance.
[0057] Specifically, see Figure 2 and Figure 3The sand mold 3D printing apparatus 10 further includes a second cleaning station 13, which is located on one side of the printing device 30 and on a different side of the printing station 11 from the first cleaning station 12. There are two carriers 20 and two sand cleaning devices 40, each of which is provided with a sand cleaning device 40 at the first cleaning station 12 and the second cleaning station 13. Two carriers 20 are provided at the first cleaning station 12 and the second cleaning station 13, respectively. A mobile device 70 is also provided at the second cleaning station 13, and the two carriers 20 are connected to the mobile device 70. The control device 60 can also be controlled by the control device 60 to move the carrier 20 provided at the second cleaning station 13 between the printing station 11 and the second cleaning station 13. That is, two cleaning stations are provided on either side of the printing station 11, each equipped with a sand cleaning device 40 and a carrier 20. The carrier 20 provided at the first cleaning station 12 can be moved between the first cleaning station 12 and the printing station 11 by the moving device 70, and the carrier 20 provided at the second cleaning station 13 can be moved between the second cleaning station 13 and the printing station 11 by the moving device 70. The specific structures of the sand cleaning device 40 and the carrier 20 can be referred to in the aforementioned specific structures, and will not be described in detail here.
[0058] Specifically, the carrier device 20 located at the first cleaning station 12 is moved by the moving device 70 to the printing station 11, so that the first moving part 22 cooperates with the printing device 30 to print on the workbench 21. After printing is completed, the moving device 70 moves the carrier device 20 back to the first cleaning station 12 for automatic sand cleaning. At this time, the first moving assembly 41 and the negative pressure cleaning assembly 42 located at the first cleaning station 12 cooperate with the first moving part 22 to clean the sand on the workbench 21 and the sand mold. While the first cleaning station 12 is performing the sand cleaning operation, the carrier device 20 at the second cleaning station 13 is moved by the moving device 70 to the printing station 11, so that the first moving part 22 cooperates with the printing device 30 to print on the workbench 21. In other words, at this time, the two carrier devices 20 are respectively at the first cleaning station 12 and the printing station 11, performing sand cleaning and printing operations, respectively.
[0059] It is understood that the above is only one of the working conditions of the sand mold 3D printing device 10 in this embodiment, and is not intended to limit this embodiment. Of course, the sand mold 3D printing device 10 in this embodiment also has other working conditions when it is implemented, which are not listed here one by one. For example, the carrying device 20 on the first cleaning station 12 is performing a sand cleaning operation, and the carrying device 20 on the second cleaning station 13 is also performing a sand cleaning operation. For another example, the carrying device 20 on the second cleaning station 13 is performing a sand cleaning operation, and the carrying device 20 on the first cleaning station 12 is moved to the printing station 11 to perform a printing operation. In this way, the two carrying devices 20 can operate simultaneously at different stations, thereby improving the working efficiency of the sand mold 3D printing device 10.
[0060] Further, see Figure 2 and Figure 3 The first cleaning station 12 and the second cleaning station 13 are arranged on opposite sides of the printing station 11, that is, the first cleaning station 12, the second cleaning station 13 and the printing station 11 can be arranged in a straight line, which facilitates the arrangement of the sand cleaning device 40, the printing device 30 and the mobile device 70, and can reduce the probability of conflict and interference between the sand cleaning device 40 and the printing device 30 during operation, thereby reducing the failure rate of the sand mold 3D printing equipment 10; the mobile device 70 does not need to be provided with a steering mechanism, thereby reducing the structural complexity of the mobile device 70, which helps to reduce the cost and failure rate of the mobile device 70.
[0061] In some specific embodiments, the printing device 30 and the sand cleaning device 40 are arranged on the same workstation. Therefore, printing and sand cleaning can be achieved at one workstation, which helps to reduce the space occupied by the equipment and improve the space utilization of the equipment.
[0062] In some embodiments, see Figure 1-3 The sand mold 3D printing device 10 also includes a mounting frame 14, which is, for example, mounted on the ground, so that the second movable part 411, the third movable part 412, the fourth movable part 34 and the fifth movable part 35 can be installed on the mounting frame 14 to form a space between the mounting frame 14 and the ground to accommodate the workbench 21, the negative pressure cleaning component 42, the printing component 33 and the sand laying component 32, thereby facilitating printing and sand cleaning.
[0063] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the present profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.
Claims
1. A sand mold 3D printing device (10), characterized in that: include: Printing device (30); A carrying device (20) comprises a workbench (21) and a first moving part (22), wherein the first moving part (22) is connected to the workbench (21), and the first moving part (22) is used to drive the workbench (21) to move in a vertical direction; A sand cleaning device (40) comprises a first moving component (41), a negative pressure cleaning component (42), and a negative pressure component (43), wherein the negative pressure cleaning component (42) is mounted on the first moving component (41) and is located above the workbench (21), and the negative pressure component (43) is connected to the negative pressure cleaning component (42); A control device (60) is connected to the carrying device (20), the printing device (30) and the sand cleaning device (40) respectively; the control device (60) can control the printing device (30) to cooperate with the first moving part (22) to print on the workbench (21).
2. The sand mold 3D printing device (10) according to claim 1, characterized in that: The first moving component (41) includes a second moving part (411) and a third moving part (412), the third moving part (412) is mounted on the second moving part (411), and the negative pressure cleaning component (42) is mounted on the third moving part (412), the second moving part (411) is used to drive the third moving part (412) to move along a first direction, and the third moving part (412) is used to drive the negative pressure cleaning component (42) to move along a second direction, and the first direction, the second direction and the vertical direction are perpendicular to each other; The negative pressure component (43) comprises a negative pressure pipeline (432) and a negative pressure pump (431), and the negative pressure pipeline (432) is connected to the negative pressure pump (431) and the negative pressure cleaning component (42).
3. The sand mold 3D printing device (10) according to claim 1, characterized in that: The negative pressure cleaning component (42) includes a connecting portion (421), a rotating portion (422) and a negative pressure suction portion (423), wherein the connecting portion (421) is connected to the first moving component (41), the rotating portion (422) is rotatably connected to the connecting portion (421), one end of the negative pressure suction portion (423) is connected to the negative pressure component (43), and the other end of the negative pressure suction portion (423) is connected to the rotating portion (422).
4. The sand mold 3D printing device (10) according to claim 3, characterized in that: The rotating part (422) includes a first rotating part (4221), a second rotating part (4222) and a first driving part, the first driving part is connected to the first rotating part (4221) and the connecting part (421) respectively, the first driving part can drive the first rotating part (4221) to rotate around the connecting part (421) with the vertical direction as the axis, the second rotating part (4222) is rotatably provided on the first rotating part (4221), and the other end of the negative pressure suction part (423) is connected to the second rotating part (4222).
5. The sand mold 3D printing device (10) according to claim 4, characterized in that: The rotating part (422) also includes a second driving part, which is connected to the first rotating part (4221) and the second rotating part (4222) respectively. The second driving part can drive the second rotating part (4222) to rotate around the first rotating part (4221) with the horizontal direction as the axis, and the horizontal direction is perpendicular to the vertical direction.
6. The sand mold 3D printing device (10) according to claim 2, characterized in that: The sand mold 3D printing device (10) further includes a recovery device (50), the recovery device (50) is connected to the control device (60), the recovery device (50) includes a negative pressure recovery tank (51), and the negative pressure pump (431), the negative pressure recovery tank (51) and the negative pressure pipeline (432) are connected in sequence.
7. The sand mold 3D printing device (10) according to claim 6, characterized in that: The recovery device (50) further comprises a stirring tank (52) and a first conveyor (53); the printing device (30) comprises a material supply assembly (31) and a sand laying assembly (32); the material supply assembly (31) comprises a sand storage unit (311), a second conveyor (312) and a sand mixer (313); The negative pressure recovery tank (51) is arranged above the stirring tank (52); a first discharge port (511) is provided at the bottom of the negative pressure recovery tank (51), and the first discharge port (511) is aligned with the stirring tank (52) in the vertical direction; the first conveyor (53) is used to convey the sand in the stirring tank (52) to the sand mixer (313); the second conveyor (312) is used to convey the sand in the sand storage part (311) to the sand mixer (313); and the sand mixer (313) can supply sand to the sand laying assembly (32).
8. The sand mold 3D printing device (10) according to claim 6, characterized in that: The recovery device (50) further includes a used sand collecting component (54), a used sand conveying component (55) and a recovery pipeline (56). The printing device (30) includes a sand laying component (32). The used sand component is arranged below the sand laying component (32). The height of the used sand collecting component (54) is lower than the highest height of the workbench (21). The used sand collecting component (54) has an used sand discharge port (541) and an opening open upward. The used sand conveying component (55) is arranged in the used sand collecting component (54). The recovery pipeline (56) is connected to the used sand discharge port (541) and the negative pressure recovery tank (51).
9. The sand mold 3D printing device (10) according to claim 1, characterized in that: The sand mold 3D printing device (10) has a printing station (11) and a first cleaning station (12) arranged on one side of the printing station (11). The sand mold 3D printing device (10) further includes a moving device (70), the printing device (30) is arranged at the printing station (11), the sand cleaning device (40) is arranged at the first cleaning station (12), the moving device (70) is arranged at the first cleaning station (12) and the printing station (11), and the carrying device (20) is arranged at the first cleaning station (12) and connected to the moving device (70).
10. The sand mold 3D printing device (10) according to claim 9, characterized in that: The sand mold 3D printing device (10) further comprises a second cleaning station (13), which is located on the other side of the printing device (30) and is located on a different side of the printing station (11) from the first cleaning station (12). The number of the sand cleaning devices (40) is two, and the first cleaning station (12) and the second cleaning station (13) are respectively provided with a sand cleaning device (40). The number of the carrying devices (20) is two, and the two carrying devices (20) are respectively provided at the first cleaning station (12) and the second cleaning station (13). The moving device (70) is also provided at the second cleaning station (13), and the two carrying devices (20) are respectively connected to the moving device (70).