Sand mold 3D printer with anti-blocking structure

Abstract

The present application relates to sand mold 3D printer technical field, this sand mold 3D printer with anti-blocking structure, including printing workstation, printing workstation is integrated with printing nozzle, drive mechanism, sand spreader and controller, controller uses PLC, single-chip microcontroller and the like control module, both sides of the printing workstation are provided with work tank, and the work tank can be moved to the printing workstation by drive mechanism, the upper surface of the printing workstation is fixedly connected with main machine sand storage tank and exhaust pipe, one side of the printing workstation is provided with control screen, is used for cooperating with controller to control printing workstation work, the neck of the main machine sand storage tank is provided with sand passing device.This sand mold 3D printer avoids the problem that sand material is easily accumulated in the neck of main machine sand storage tank due to its structure, causes its own blockage unable to normally sand supply, influences the forming quality and production efficiency of sand mold printer.

Description

Technical Field

[0001] This invention belongs to the technical field of sand mold 3D printers, specifically relating to a sand mold 3D printer with an anti-clogging structure. Background Technology

[0002] Sand mold 3D printers are specialized additive manufacturing equipment that utilizes binder jetting technology to enable rapid, moldless sand mold production in the foundry industry. These printers can directly print the required sand molds and cores layer by layer from the three-dimensional digital model of the casting, completely eliminating the need for traditional wooden or metal mold making processes. This significantly shortens the development and small-batch production cycle of castings, making them widely used in the trial production and mass casting of complex components in industries such as automotive engine castings, engineering machinery valve bodies, wind turbine housings, and aerospace.

[0003] When existing sand mold 3D printers are working, they rely on a sand storage tank above the printing station to supply sand to the sand spreader. The sand storage tank generally adopts a cone-shaped structure that is wider at the top and narrower at the bottom. The diameter of the discharge neck is much smaller than the inner diameter of the tank body. When the sand flows through the neck by gravity, the particles will squeeze and interlock with each other, forming a stable material arch structure that causes discharge blockage. This leads to the interruption of the sand supply from the sand storage tank, making it impossible to continuously and stably supply sand to the sand spreader. This directly interferes with the normal operation of sand spreading and affects the molding quality and production efficiency of sand mold printing. Summary of the Invention

[0004] The purpose of this invention is to provide a sand mold 3D printer with a simple structure and reasonable design and anti-clogging structure in order to solve the above problems.

[0005] The present invention achieves the above objectives through the following technical solutions: A sand mold 3D printer with an anti-clogging structure includes a printing workstation, which integrates a printing nozzle, a drive mechanism, a sand spreader, and a controller. The controller uses control modules such as PLC and microcontroller. Both sides of the printing workstation are equipped with work boxes, which can be moved into the printing workstation by the drive mechanism. The upper surface of the printing workstation is fixedly connected to a main sand storage tank and an exhaust pipe. A control panel is installed on one side of the printing workstation to cooperate with the controller to control the operation of the printing workstation. A sand-passing device is provided at the neck of the main sand storage tank. The sand-passing device includes a cylinder fixed to the neck of the main sand storage tank. A piston rod is movably mounted on the inner wall of the cylinder. The piston rod is U-shaped, and an air chamber is formed between the middle section of the piston rod and the cylinder, allowing air to be injected into the air chamber to move the piston rod. A cross-shaped stirring blade is fixedly connected to one end of the piston rod, and the cross-shaped stirring blade is located inside the main sand storage tank. A spiral guide groove is formed on the surface of the piston rod, and a mounting hole is formed on the surface of the cylinder. A limit pin is fixedly connected to the inner wall of the mounting hole. The limit pin is slidably connected to the inner wall of the spiral guide groove. The cooperation between the limit pin and the spiral guide groove allows the piston rod to move. During the linear reciprocating motion, a rotational motion can be performed simultaneously, thereby driving the cross-shaped stirring blades at its end to perform stirring operations. A cylinder cover is fixedly connected to the side of the cylinder body away from the main sand storage tank. A three-position five-way solenoid valve is installed on the lower side of the cylinder body. An air compressor is fixedly connected to the upper surface of the printing workstation. The cooperation between the air compressor and the three-position five-way solenoid valve can pump gas into the cylinder body, thereby driving the piston rod to perform linear reciprocating motion in the cylinder body. Among them, the controller, drive mechanism, print head, sand spreader, control panel, three-position five-way solenoid valve and air compressor are all existing technologies and will not be described in detail here.

[0006] As a further optimization of the present invention, two circular holes are formed on the surface of the cylinder body, and connectors are fixedly connected to the inner walls of the two circular holes. A first air pipe is fixedly connected between the connectors and the three-position five-way solenoid valve. The cooperation between the first air pipe and the connectors allows the gas supplied by the three-position five-way solenoid valve to be injected into the cylinder body, and at the same time, the gas in the cylinder body can be discharged through the three-position five-way solenoid valve. A second air pipe is fixedly connected between the three-position five-way solenoid valve and the air compressor. The air compressor supplies gas to the air inlet of the three-position five-way solenoid valve through the second air pipe, ensuring that the three-position five-way solenoid valve can use gas to control the movement of the piston rod.

[0007] As a further optimization of the present invention, a groove is formed on the surface of the piston rod, and a first sealing ring is installed on the inner wall of the groove. The first sealing ring is in movable contact with the inner wall of the cylinder. The first sealing ring can increase the airtightness between the piston rod and the cylinder to ensure that the piston rod can move linearly after the gas is injected into the cylinder. An installation groove is formed on the inner wall of the cylinder, and a second sealing ring is installed on the inner wall of the installation groove. The second sealing ring is in movable contact with the surface of the piston rod. The second sealing ring can cooperate with the first sealing ring to further enhance the airtightness between the piston rod and the cylinder. A third sealing ring is installed between the end of the cylinder away from the cylinder head and the main unit sand storage tank to enhance the sealing performance between the cylinder and the main unit sand storage tank. The first sealing ring, the second sealing ring and the third sealing ring are all made of one of the following: O-ring, rectangular sealing ring or U-ring, and their material is fluororubber, nitrile rubber or polytetrafluoroethylene.

[0008] As a further optimization of the present invention, a bracket is fixedly connected to the upper surface of the printing workstation, and the cylinder head and the three-position five-way solenoid valve are both fixedly connected to the surface of the bracket. The bracket can work with the host sand tank and the cylinder head to support the cylinder body and the three-position five-way solenoid valve, so as to ensure the stability of the cylinder body and the three-position five-way solenoid valve during use.

[0009] As a further optimization of the present invention, an assisting device is provided on the surface of the bracket. The assisting device includes a housing mounted on one side of the bracket, and a sealing cover is fixedly connected to the side of the housing away from the bracket. A filter element is installed between the housing and the sealing cover. The sealing cover can confine the filter element inside the housing, ensuring the stability of the filter element while allowing it to be disassembled and replaced during subsequent use. A third air pipe is fixedly connected between the sealing cover and the three-position five-way solenoid valve. The third air pipe connects the sealing cover and the air outlet of the three-position five-way solenoid valve, allowing the gas discharged from the three-position five-way solenoid valve to flow into the housing. The cylinder head has a gas collection system. A gas guide pipe is fixedly connected to the inner wall of the cylinder head. A flow guide cavity is formed on one side of the piston rod. The gas guide pipe is movably connected to the inner wall of the flow guide cavity. An air passage is formed on the inner wall of the flow guide cavity, penetrating the end face of the piston rod. The cooperation between the flow guide cavity and the air passage allows gas to be blown out from the end face of the piston rod, thereby working with the cross-shaped stirring blades to clear the sand in the neck of the main unit's sand storage tank. A sintered filter is fixedly connected to the outlet end of the air passage. The sintered filter ensures that gas can be blown out from the air passage while protecting the outlet port of the air passage, preventing sand from entering and causing blockage.

[0010] As a further optimization of the present invention, the inner wall of the flow guide cavity is provided with an assembly groove, and a fourth sealing ring is installed in the assembly groove. The fourth sealing ring is sleeved on the surface of the air guide pipe. The fourth sealing ring can increase the air tightness between the air guide pipe and the flow guide cavity, and prevent the gas in the cylinder from escaping through the gap between the air guide pipe and the flow guide cavity, which would cause insufficient cylinder pressure and prevent the piston rod from being driven. The fourth sealing ring is an O-ring, and its material is fluororubber, nitrile rubber or polytetrafluoroethylene.

[0011] As a further optimization of the present invention, the air guide pipe penetrates the cylinder head, and its side near the outer shell is located inside the bracket. The outer shell is fixedly connected to the side surface of the air guide pipe and communicates with the inside of the air guide pipe. The filter element is located inside the outer shell. The filter element can filter the gas entering the air guide pipe from the outer shell to prevent impurities in the gas from entering the air guide pipe and contaminating the air guide pipe, the flow chamber and the air passage.

[0012] As a further optimization of the present invention, a protective device is provided between the main sand storage tank and the cylinder body. The protective device includes a positioning cylinder installed between the neck of the main sand storage tank and the end face of the cylinder body. A fixing ring is rotatably connected to the end of the piston rod near the cross-shaped stirring blade. A flexible sleeve is fixedly connected between the fixing ring and the positioning cylinder. The flexible sleeve is sleeved on the end of the piston rod near the cross-shaped stirring blade. The fixing ring can fix the flexible sleeve on the piston rod, so that the flexible sleeve can protect the end of the piston rod located in the main sand storage tank. The flexible sleeve is made of polyurethane, nitrile rubber, hydrogenated nitrile rubber, or fluororubber to adapt to the working conditions of long-term reciprocating extension and contraction of the flexible sleeve.

[0013] As a further optimization of the present invention, the positioning cylinder is movably sleeved on the piston rod, and the outer diameter of the fixing ring is smaller than the outer diameter of the piston rod near the cross-shaped stirring blade. The design that the outer diameter of the fixing ring is smaller than the outer diameter of the piston rod end allows the flexible sleeve to smoothly retract into the positioning cylinder when the fixing ring pulls the flexible sleeve to move with the piston rod, thereby reducing the interference of the flexible sleeve's extension and retraction on the piston rod stroke.

[0014] The beneficial effects of this invention are as follows: 1. Because the main sand storage tank is equipped with a sand-passing device, when the main sand storage tank delivers the sand stored inside to the sand spreader, the cross-shaped stirring blades and piston rod can reciprocate in a linear and rotary motion along the cylinder to guide the sand in the neck of the main sand storage tank. This allows the sand in the neck to pass smoothly and avoids the problem that the main sand storage tank, due to its structure, is prone to sand accumulation in the neck, causing blockage and preventing normal sand supply, which would affect the molding quality and production efficiency of the sand mold printer.

[0015] 2. By installing an auxiliary device on the sand-passing device, the exhaust gas generated during the operation of the sand-passing device can be reused, thereby assisting the cross-shaped stirring blades and piston rod of the sand-passing device in guiding the sand material in the neck of the main sand storage tank, and further enhancing the sand-passing effect of the sand-passing device on the main sand storage tank.

[0016] 3. By using a protective device installed between the piston rod and the main unit's sand storage tank, the end of the piston rod located in the main unit's sand storage tank can be protected, thereby isolating the piston rod from the sand and ensuring that the piston rod does not directly contact the sand during operation. This reduces wear on the piston rod and improves the surface finish and airtightness of the piston rod during long-term use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is the present invention. Figure 1 Rear view diagram; Figure 3This is a schematic diagram of the installation structure of the main sand storage tank and the positioning cylinder of the present invention; Figure 4 This is a schematic diagram of the sand-passing device of the present invention; Figure 5 This is a schematic diagram of the connection structure between the cylinder head and the air guide pipe of the present invention; Figure 6 This is a schematic diagram of the air duct structure of the present invention; Figure 7 This is a schematic diagram showing the position of the flexible sleeve of the present invention; Figure 8 This is a schematic diagram of the protective device of the present invention.

[0018] In the diagram: 1. Printing workstation; 2. Main unit sand storage tank; 3. Working box; 4. Exhaust pipe; 5. Control panel; 6. Sand passage device; 61. Cylinder body; 62. Piston rod; 63. Cross-shaped stirring blade; 64. Spiral guide groove; 65. Limit pin; 66. Cylinder head; 67. Bracket; 68. Three-position five-way solenoid valve; 69. Air compressor; 610. Connector; 611. First air pipe; 612. Second air pipe; 613. First sealing ring; 614. Second sealing ring; 615. Third sealing ring; 7. Auxiliary device; 71. Housing; 72. Filter element; 73. Sealing cover; 74. Third air pipe; 75. Air guide pipe; 76. Flow guide cavity; 77. Air passage; 78. Sintered filter plate; 79. Fourth sealing ring; 8. Protective device; 81. Fixing ring; 82. Positioning cylinder; 83. Flexible sleeve. Detailed Implementation

[0019] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0020] Example: Please refer to Figures 1-8 A sand mold 3D printer with an anti-clogging structure includes a printing workstation 1, which integrates a printing nozzle, a drive mechanism, a sand spreader, and a controller. The controller uses PLC, microcontroller, and other control modules. Work boxes 3 are set on both sides of the printing workstation 1. The work boxes 3 can be moved into the printing workstation 1 by the drive mechanism. The main sand storage tank 2 and the exhaust pipe 4 are fixedly connected to the upper surface of the printing workstation 1. A control panel 5 is installed on one side of the printing workstation 1 to cooperate with the controller to control the operation of the printing workstation 1. A sand passage device 6 is set at the neck of the main sand storage tank 2.

[0021] Please see Figure 3 and Figure 4The sand-passing device 6 includes a cylinder 61 fixed to the neck of the main sand storage tank 2. A piston rod 62 is movably mounted on the inner wall of the cylinder 61. The piston rod 62 is U-shaped, and an air chamber is formed between the middle section of the piston rod 62 and the cylinder 61, allowing air to be injected into the air chamber to move the piston rod 62. A cross-shaped stirring blade 63 is fixedly connected to one end of the piston rod 62. The cross-shaped stirring blade 63 is located inside the main sand storage tank 2. A spiral guide groove 64 is formed on the surface of the piston rod 62 and is located inside the air chamber. An installation hole is formed on the surface of the cylinder 61. A limit pin 65 is fixedly connected to the inner wall of the installation hole. The limit pin 65 is slidably connected to the inner wall of the spiral guide groove 64. The cooperation between the limit pin 65 and the spiral guide groove 64 is... This allows the piston rod 62 to rotate synchronously during its linear reciprocating motion, thereby driving the cross-shaped stirring blade 63 at its end to perform stirring operations. A cylinder cover 66 is fixedly connected to the side of the cylinder body 61 away from the sand storage tank 2 of the main unit. A three-position five-way solenoid valve 68 is installed on the lower side of the cylinder body 61. An air compressor 69 is fixedly connected to the upper surface of the printing workstation 1. The cooperation between the air compressor 69 and the three-position five-way solenoid valve 68 can pump gas into the cylinder body 61, thereby driving the piston rod 62 to perform linear reciprocating motion in the cylinder body 61. Among them, the controller, drive mechanism, print head, sand spreader, control panel 5, three-position five-way solenoid valve 68 and air compressor 69 are all existing technologies and will not be described in detail here.

[0022] Please see Figure 4 Two round holes are formed on the surface of the cylinder 61. A connector 610 is fixedly connected to the inner wall of each round hole. A first air pipe 611 is fixedly connected between the connector 610 and the three-position five-way solenoid valve 68. The cooperation between the first air pipe 611 and the connector 610 allows the gas delivered by the three-position five-way solenoid valve 68 to be injected into the cylinder 61. At the same time, the gas in the cylinder 61 can also be discharged through the three-position five-way solenoid valve 68. A second air pipe 612 is fixedly connected between the three-position five-way solenoid valve 68 and the air compressor 69. The air compressor 69 delivers gas to the air inlet of the three-position five-way solenoid valve 68 through the second air pipe 612, ensuring that the three-position five-way solenoid valve 68 can use gas to control the movement of the piston rod 62.

[0023] Please see Figure 4The piston rod 62 has a groove on its surface, and a first sealing ring 613 is installed on the inner wall of the groove. The first sealing ring 613 movably abuts against the inner wall of the cylinder 61. The first sealing ring 613 can increase the airtightness between the piston rod 62 and the cylinder 61, ensuring that the piston rod 62 can move linearly after gas is injected into the cylinder 61. The inner wall of the cylinder 61 has a mounting groove, and a second sealing ring 614 is installed on the inner wall of the mounting groove. The second sealing ring 614 movably abuts against the surface of the piston rod 62. The sealing ring 614 can work with the first sealing ring 613 to further enhance the airtightness between the piston rod 62 and the cylinder 61. A third sealing ring 615 is installed between the end of the cylinder 61 away from the cylinder head 66 and the main unit sand storage tank 2 to enhance the sealing performance between the cylinder 61 and the main unit sand storage tank 2. The first sealing ring 613, the second sealing ring 614 and the third sealing ring 615 are all made of one of the following: O-ring, rectangular sealing ring or U-ring, and their material is fluororubber, nitrile rubber or polytetrafluoroethylene.

[0024] Please see Figures 2-4 A bracket 67 is fixedly connected to the upper surface of the printing workstation 1. The cylinder head 66 and the three-position five-way solenoid valve 68 are both fixedly connected to the surface of the bracket 67. The bracket 67 can work with the host sand storage tank 2 and the cylinder head 66 to support the cylinder body 61 and the three-position five-way solenoid valve 68, so as to ensure the stability of the cylinder body 61 and the three-position five-way solenoid valve 68 during use.

[0025] Please see Figure 3 and Figure 5The support 67 has an assisting device 7 on its surface. The assisting device 7 includes a housing 71 mounted on one side of the support 67. A sealing cover 73 is fixedly connected to the side of the housing 71 facing away from the support 67. A filter element 72 is installed between the housing 71 and the sealing cover 73. The sealing cover 73 confines the filter element 72 inside the housing 71, ensuring the stability of the filter element 72 while allowing it to be disassembled and replaced during subsequent use. A third air pipe 74 is fixedly connected between the sealing cover 73 and the three-position five-way solenoid valve 68. The third air pipe 74 connects the sealing cover 73 and the air outlet of the three-position five-way solenoid valve 68, allowing the gas discharged from the three-position five-way solenoid valve 68 to flow into the housing 71, thus achieving… For the collection of exhaust gas, a gas guide pipe 75 is fixedly connected to the inner wall of the cylinder head 66. A flow guide cavity 76 is opened on one side of the piston rod 62. The gas guide pipe 75 is movably connected to the inner wall of the flow guide cavity 76. An air passage 77 is opened on the inner wall of the flow guide cavity 76, penetrating the end face of the piston rod 62. The cooperation between the flow guide cavity 76 and the air passage 77 can blow gas out from the end face of the piston rod 62, thereby cooperating with the cross-shaped stirring blade 63 to clear the sand in the neck of the main unit's sand storage tank 2. A sintered filter 78 is fixedly connected to the outlet end of the air passage 77. The sintered filter 78 can protect the outlet port of the air passage 77 while ensuring that gas can be blown out from the air passage 77, preventing sand from entering the air passage 77 and causing blockage.

[0026] Please see Figure 5 and Figure 6 The inner wall of the flow guide cavity 76 is provided with an assembly groove, and a fourth sealing ring 79 is installed in the assembly groove. The fourth sealing ring 79 is sleeved on the surface of the air guide pipe 75. The fourth sealing ring 79 can increase the air tightness between the air guide pipe 75 and the flow guide cavity 76, and prevent the gas in the cylinder 61 from escaping through the gap between the air guide pipe 75 and the flow guide cavity 76, which would cause insufficient air pressure in the cylinder 61 and prevent the piston rod 62 from being driven. The fourth sealing ring 79 is an O-ring, and its material is fluororubber, nitrile rubber or polytetrafluoroethylene.

[0027] Please see Figure 3 , Figure 5 and Figure 6 The air guide pipe 75 passes through the cylinder head 66, and its side near the outer shell 71 is located inside the bracket 67. The outer shell 71 is fixedly connected to the side surface of the air guide pipe 75 and communicates with the inside of the air guide pipe 75. The filter element 72 is located inside the outer shell 71. The filter element 72 can filter the gas entering the air guide pipe 75 from the outer shell 71 to prevent impurities in the gas from entering the air guide pipe 75 and contaminating the air guide pipe 75, the guide chamber 76 and the air passage 77.

[0028] Please see Figure 3 , Figure 7 and Figure 8A protective device 8 is provided between the main sand storage tank 2 and the cylinder 61. The protective device 8 includes a positioning cylinder 82 installed between the neck of the main sand storage tank 2 and the end face of the cylinder 61. A fixing ring 81 is rotatably connected to the end of the piston rod 62 near the cross stirring blade 63. A flexible sleeve 83 is fixedly connected between the fixing ring 81 and the positioning cylinder 82. The flexible sleeve 83 is sleeved on the end of the piston rod 62 near the cross stirring blade 63. The fixing ring 81 can constrain the flexible sleeve 83 to the end of the piston rod 62, so that the flexible sleeve 83 can protect the end of the piston rod 62 located in the main sand storage tank 2. The flexible sleeve 83 is made of polyurethane, nitrile rubber, hydrogenated nitrile rubber or fluororubber, which is used to adapt to the working conditions of long-term reciprocating extension and contraction of the flexible sleeve 83.

[0029] Please see Figure 7 and Figure 8 The positioning cylinder 82 is movably sleeved on the piston rod 62. The outer diameter of the fixing ring 81 is smaller than the outer diameter of the piston rod 62 near the cross-shaped stirring blade 63. The design that the outer diameter of the fixing ring 81 is smaller than the outer diameter of the piston rod 62 end allows the flexible sleeve 83 to smoothly retract into the positioning cylinder 82 when the fixing ring 81 pulls the flexible sleeve 83 to move with the piston rod 62, reducing the interference of the extension and retraction of the flexible sleeve 83 on the stroke of the piston rod 62.

[0030] It should be noted that, in use, the sand mold 3D printer with anti-clogging structure inputs the drawing into the printing workstation 1 through the control panel 5. The controller controls the drive mechanism, the print head and the sand spreader to work. The drive mechanism moves the work box 3 into the printing workstation 1. When the work box 3 is in place, the sand spreader, together with the main unit's sand storage tank 2, spreads sand on the work box 3. The print head prints on the work box 3 according to the drawing, thereby realizing the printing operation of the workpiece. After printing is completed, the sand spreader and the print head stop working, and the drive mechanism moves the work box 3 out of the printing workstation 1. When the work box 3 is completely reset, the operator can remove the workpiece from the work box 3. When the main sand storage tank 2 supplies sand to the sand spreader, the air compressor 69 works synchronously, and supplies air to the three-position five-way solenoid valve 68 in conjunction with the second air pipe 612. Under the control of the controller, the three-position five-way solenoid valve 68 supplies air to the cylinder 61 in conjunction with the first air pipe 611 and the connector 610. During the air supply process, the three-position five-way solenoid valve 68 exhausts the cylinder 61 through another air path. Based on this, the piston rod 62 reciprocates linearly in the cylinder 61 under the action of the three-position five-way solenoid valve 68. At the same time, the piston rod 62 is guided by the spiral guide groove 64 and the limit pin 65, and rotates during the linear motion. The cross stirring blade 63 follows the piston rod 62 and clears the sand in the neck of the main sand storage tank 2 during the motion. When the three-position five-way solenoid valve 68 exhausts gas, the exhaust gas flows into the outer casing 71 through the third air pipe 74. The exhaust gas in the outer casing 71 flows into the air guide pipe 75 through the filter element 72. The air guide pipe 75 injects the gas into the guide chamber 76. The guide chamber 76 blows the gas into the neck of the main unit sand storage tank 2 through the air passage 77 and the sintered filter 78 to assist the piston rod 62 and the cross stirring blade 63 in clearing the sand in the neck of the main unit sand storage tank 2. When the piston rod 62 moves, the piston rod 62, together with the fixed ring 81, drives the flexible sleeve 83, so that the flexible sleeve 83 follows the piston rod 62 to protect the end of the piston rod 62 in real time. Because the main sand storage tank 2 is equipped with a sand-passing device 6, when the main sand storage tank 2 delivers the sand stored inside to the sand spreader, the cross-shaped stirring blade 63 and the piston rod 62 can reciprocate linear and rotary motions along the cylinder 61 to guide the sand in the neck of the main sand storage tank 2, so that the sand in the neck can pass smoothly. This avoids the problem that the sand in the main sand storage tank 2 is prone to accumulating in its neck due to its structure, causing blockage and preventing normal sand supply, which would affect the molding quality and production efficiency of the sand mold printer.

[0031] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A sand mold 3D printer with an anti-clogging structure, comprising a printing workstation (1), characterized in that: Working boxes (3) are arranged on both sides of the printing workstation (1), a main machine sand storage tank (2) and an exhaust pipe (4) are fixedly connected to the upper surface of the printing workstation (1), a control screen (5) is installed on one side of the printing workstation (1), and a sand passing device (6) is arranged on the neck of the main machine sand storage tank (2). The sand passing device (6) comprises a cylinder body (61) fixed to the neck of the main machine sand storage tank (2), a piston rod (62) is movably installed on the inner wall of the cylinder body (61), the piston rod (62) is in a T-shape, one end of the piston rod (62) is fixedly connected with a cross stirring blade (63), the cross stirring blade (63) is located in the main machine sand storage tank (2), a spiral guide groove (64) is opened on the surface of the piston rod (62), a mounting hole is opened on the surface of the cylinder body (61), a limit pin (65) is fixedly connected to the inner wall of the mounting hole, the limit pin (65) is slidably connected to the inner wall of the spiral guide groove (64), a cylinder cover (66) is fixedly connected to the side of the cylinder body (61) facing away from the main machine sand storage tank (2), a three-position five-way solenoid valve (68) is installed on the lower side of the cylinder body (61), and an air compressor (69) is fixedly connected to the upper surface of the printing workstation (1); Two round holes are opened on the surface of the cylinder body (61), connectors (610) are fixedly connected to the inner walls of both the two round holes, a first air pipe (611) is fixedly connected between the connectors (610) and the three-position five-way solenoid valve (68), a second air pipe (612) is fixedly connected between the three-position five-way solenoid valve (68) and the air compressor (69), a bracket (67) is fixedly connected to the upper surface of the printing workstation (1), and both the cylinder cover (66) and the three-position five-way solenoid valve (68) are fixedly connected to the surface of the bracket (67); An assisting device (7) is arranged on the surface of the bracket (67), the assisting device (7) comprises an outer shell (71) installed on one side of the bracket (67), a sealing cover (73) is fixedly connected to the side of the outer shell (71) facing away from the bracket (67), a filter element (72) is installed between the outer shell (71) and the sealing cover (73), a third air pipe (74) is fixedly connected between the sealing cover (73) and the three-position five-way solenoid valve (68), an air guide pipe (75) is fixedly connected to the inner wall of the cylinder cover (66), a flow guide cavity (76) is opened on one side of the piston rod (62), the air guide pipe (75) is movably connected to the inner wall of the flow guide cavity (76), an air channel (77) penetrating through the end face of the piston rod (62) is opened on the inner wall of the flow guide cavity (76), and a sintered filter sheet (78) is fixedly connected to the air outlet end of the air channel (77).

2. The sand mold 3D printer with anti-clogging structure according to claim 1, characterized in that: The piston rod (62) has a groove on its surface, and a first sealing ring (613) is installed on the inner wall of the groove. The first sealing ring (613) is in movable contact with the inner wall of the cylinder (61). The inner wall of the cylinder (61) has an installation groove, and a second sealing ring (614) is installed on the inner wall of the installation groove. The second sealing ring (614) is in movable contact with the surface of the piston rod (62). A third sealing ring (615) is installed between the end of the cylinder (61) away from the cylinder head (66) and the main machine sand storage tank (2).

3. The sand mold 3D printer with anti-clogging structure according to claim 1, characterized in that: The inner wall of the flow guide cavity (76) is provided with an assembly groove, and a fourth sealing ring (79) is installed in the assembly groove. The fourth sealing ring (79) is sleeved on the surface of the air guide tube (75).

4. The sand mold 3D printer with anti-clogging structure according to claim 1, characterized in that: The air guide pipe (75) passes through the cylinder head (66), and its side near the outer shell (71) is located inside the bracket (67). The outer shell (71) is fixedly connected to the side surface of the air guide pipe (75) and communicates with the inside of the air guide pipe (75). The filter element (72) is located inside the outer shell (71).

5. The sand mold 3D printer with anti-clogging structure according to claim 1, characterized in that: A protective device (8) is provided between the main sand storage tank (2) and the cylinder (61). The protective device (8) includes a positioning cylinder (82) installed between the neck of the main sand storage tank (2) and the end face of the cylinder (61). A fixing ring (81) is rotatably connected to one end of the piston rod (62) near the cross stirring blade (63). A flexible sleeve (83) is fixedly connected between the fixing ring (81) and the positioning cylinder (82). The flexible sleeve (83) is sleeved on one end of the piston rod (62) near the cross stirring blade (63).

6. The sand mold 3D printer with anti-clogging structure according to claim 5, characterized in that: The positioning cylinder (82) is movably sleeved on the piston rod (62), and the outer diameter of the fixing ring (81) is smaller than the outer diameter of the piston rod (62) near the cross stirring blade (63).

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